Omicron Lab CT Analyzer, CT SB2 User Manual

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CT Analyzer & CT SB2

User Manual

CT Analyzer & CT SB2 User Manual

Manual Version: CTAnalyzer+CTSB2UM.AE.3

This manual is a publication of OMICRON electronics GmbH.

All rights including translation reserved. Reproduction of any kind, for example, photocopying, microfilming, optical character recognition and/or storage in electronic data processing systems, requires the explicit consent of OMICRON electronics GmbH. Reprinting, wholly or in part, is not permitted.

The product information, specifications, and technical data embodied in this manual represent the technical status at the time of writing and are subject to change without prior notice.

We have done our best to ensure that the information given in this manual is useful, accurate and entirely reliable. However, OMICRON electronics GmbH does not assume responsibility for any inaccuracies which may be present.

The user is responsible for every application that makes use of an OMICRON product.

OMICRON electronics GmbH translates this manual from the source language English into a number of other languages. Any translation of this manual is done for local requirements, and in the event of a dispute between the English and a non-English version, the English version of this manual shall govern.

CT Analyzer

User Manual

CT Analyzer User Manual

Manual Version: CTAnalyzerUM.AE.3

Contents

Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Using This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Operator Qualifications and Safety Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Conventions and Symbols Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Safety Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

General Rules for Safe Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Orderly Measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

1.1 Designated Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

1.2 Functional Components of the CT Analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

1.2.1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

1.2.2 Mains Connection Unit and Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

1.2.3 Compact Flash Card Slot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

1.2.4 Remote Control Interface (PC Connection) . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

1.2.5 Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

1.2.6 I/0 Key with Status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

1.2.7 Display with Soft Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

1.2.8 Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

1.3 License-Depending Functional Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

1.4 Scope of Delivery, Accessories, Available Licenses . . . . . . . . . . . . . . . . . . . . . 20

2 Setup and Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

2.1 General Safety Rules for Connecting and Operating the CT Analyzer . . . . . . . 21

2.2 Setting Up the CT Analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

2.3 Connecting the CT Analyzer to a PC (optional). . . . . . . . . . . . . . . . . . . . . . . . . 23

2.4 Connection for Usual Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

2.4.1 Wiring for a CT Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

2.4.2 Wiring for a Burden Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

2.4.3 Wiring for Primary Resistance Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . 27

2.5 Connection for Special Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

2.5.1 Measurement on a Gapped Core . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

2.5.2 Excitation Curve Measurement for an Unwound Iron Core . . . . . . . . . . . . . . . 29

2.5.3 Measurement on a GIS (SF6) Switch Gear . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

2.5.4 Measurement on Bushing-Type CTs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

2.5.5 VT Ratio Measurement Using QuickTest . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

CT Analyzer User Manual

2.5.6 VT Winding Resistance Measurement Using QuickTest . . . . . . . . . . . . . . . . . 39

2.5.7 Polarity Check Using QuickTest and the CPOL Polarity Checker . . . . . . . . . . 39

2.6 Disconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

2.7 Improving the Quality of Measurement Results. . . . . . . . . . . . . . . . . . . . . . . . . 42

2.7.1 4-Wire Measurement vs. 2-Wire Measurement . . . . . . . . . . . . . . . . . . . . . . . . 42

2.7.2 Noise Reduction Techniques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

3 Short Guide for Running a CT Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

4 Running a CT Test (Detailed) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

4.1 Setting Up the CT Analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

4.2 Preparing and Configuring the Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

4.3 Running the Automatic Test and Connecting the CT Analyzer . . . . . . . . . . . . . 52

4.4 After the Test is Finished. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

4.5 Disconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

5 Operating and Configuring the CT Analyzer. . . . . . . . . . . . . . . . . . . . . . . . 59

5.1 Working in the User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

5.1.1 Displaying a Specific Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

5.1.2 Using the Soft Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

5.1.3 Editing a Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

5.2 The Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

5.3 New CT-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

5.4 New MR-Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

5.5 New Quick-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

5.6 File Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

5.6.1 Available Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

5.6.2 Working in the File System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

5.7 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

5.7.1 Available Options in the Settings Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

5.7.2 Default Test Card Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

5.7.3 Miscellaneous Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

5.8 Tools (Update Functions) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

5.8.1 Available Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

5.8.2 Update Text . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

5.8.3 Update Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

5.9 CT Analyzer Help System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

5.10 Operating the CT Analyzer from a Computer . . . . . . . . . . . . . . . . . . . . . . . . . . 77

6 The CT Analyzer Test Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

6.1 Overview of Test Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

6.2 CT-Object Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Contents

6.2.1 Available Soft Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

6.2.2 Information Fields to be Filled by the User . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

6.2.3 Parameters and Settings Used or Determined by the Test Process . . . . . . . . 82

6.3 Burden Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

6.3.1 Test Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

6.3.2 Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

6.3.3 Connecting the Burden and Running the Burden Test . . . . . . . . . . . . . . . . . . 101

6.4 Residual Magnetism Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

6.4.1 Test Settings and Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

6.4.2 Running a Residual Magnetism Measurement. . . . . . . . . . . . . . . . . . . . . . . . 103

6.5 Resistance Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

6.5.1 Primary Winding Resistance Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . 106

6.5.2 Secondary Winding Resistance Measurement . . . . . . . . . . . . . . . . . . . . . . . . 106

6.5.3 Test Settings and Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

6.6 Excitation Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

6.6.1 Available Soft Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

6.6.2 Test Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

6.6.3 Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

6.6.4 Excitation Graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

6.6.5 Accuracy Limiting Error Graph* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

6.7 Ratio Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

6.7.1 Available Soft Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

6.7.2 Test Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

6.7.3 Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

6.7.4 Ratio Table and Phase Table for IEC 60044-1, IEC 60044-6 and

IEC 61869-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

6.7.5 Ratio Table and Phase Table for IEEE C57.13 . . . . . . . . . . . . . . . . . . . . . . . 123

6.8 Assessment Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

6.8.1 Assessed Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

6.9 Comment Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

7 CT Testing Using the Guesser Function . . . . . . . . . . . . . . . . . . . . . . . . . .131

7.1 About the Guesser Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

7.2 Setting Up and Connecting the CT Analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . 132

7.3 Preparing and Configuring the Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

7.4 Running the Automatic Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

7.5 After the Test is Finished . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

7.6 Disconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

8 Using the Quick Test Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .135

8.1 Safety Notes and Notes for Using Quick Test . . . . . . . . . . . . . . . . . . . . . . . . . 136

CT Analyzer User Manual

8.2 Introduction to Quick Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

8.3 Performing Measurements with Quick Test. . . . . . . . . . . . . . . . . . . . . . . . . . . 139

8.4 Advanced Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

8.5 Polarity Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

8.6 CT Ratio Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

8.7 VT Ratio Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151

8.8 Resistance Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154

8.9 Impedance Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156

8.10 Reactance Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158

9 CT Analyzer PC Toolset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

9.1 System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

9.2 Installing the CT Analyzer PC Toolset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

9.3 The CTA Start Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162

10 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .163

10.1 Mains Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

10.2 Generator Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

10.3 Measurement Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

10.4 Winding Resistance Measurement Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . 164

10.5 Ratio and Phase Measurement Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

10.6 Compact Flash Card Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166

10.7 Remote Control Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166

10.7.1 RS232 Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166

10.7.2 USB Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

10.8 Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

10.8.1 Climate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

10.8.2 Shock and Vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168

10.8.3 Mechanical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168

10.8.4 Safety Standards, Electromagnetic Compatibility (EMC) . . . . . . . . . . . . . . . . 168

11 User Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

11.1 Care and Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

11.2 Replacing Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

11.3 Calibrating the CT Analyzer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

12 Error and Warning Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171

OMICRON Service Centers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Preface

Using This Manual

This User Manual provides information on how to use the CT Analyzer. The CT Analyzer User Manual contains important safety instructions for working with the CT Analyzer and gets you familiar with operating the CT Analyzer. Read and observe the safety rules described in "Safety Rules" on page 9 and all relevant installation and operation instructions. Following the instructions in this User Manual will help you to prevent danger, repair costs, and avoid possible down time due to incorrect operation.

The CT Analyzer User Manual always has to be available at the site where the

CT Analyzer is used. It must be read and observed by all users of the CT Analyzer. Reading the CT Analyzer User Manual alone does not release you

from the duty to comply with all relevant national and international safety regulations.

Operator Qualifications and Safety Standards

Preface

Working on high-voltage power equipment can be extremely dangerous.

Testing with the CT Analyzer should only be carried out by authorized and qualified personnel. Before starting to work, clearly establish the responsibilities.

Personnel receiving training, instruction, direction, or education on the CT Analyzer should remain under the constant supervision of an experienced operator while working with the equipment.

Testing with the CT Analyzer must comply with the internal safety instructions as well as additional relevant documents.

In addition, observe the following safety standards, if applicable:

• EN 50191 (VDE 0104) "Erection and Operation of Electrical Equipment"

• EN 50110-1 (VDE 0105 Part 100) "Operation of Electrical Installations"

• IEEE 510 "IEEE Recommended Practices for Safety in High-Voltage and High-Power Testing"

CT Analyzer User Manual

Conventions and Symbols Used

In this manual, the following symbols indicate paragraphs with special safety relevant meaning:

Symbol Description

Safety Rules

Before operating the CT Analyzer, read the instructions in this section carefully. If you do not understand some safety rules, contact OMICRON before proceeding. When working with the CT Analyzer, observe the following safety rules.

Maintenance and repair is only permitted by qualified experts at OMICRON repair centers.

General Rules for Safe Operation

• Always observe the five safety rules:

– Disconnect completely

– Secure from reconnection

– Verify that the installation is dead

– Carry out grounding and short-circuiting

– Provide protection against adjacent live parts

• Do not touch any terminals without a visible connection to ground.

• Always be aware of the danger of the high voltages and currents associated with this equipment. Pay attention to the information provided in this user manual.

•Use the CT Analyzer and its accessories only in a technically sound condition and when its use is in accordance with the safety regulations for the specific job site and application.

• Use only original accessories available from OMICRON.

• If the CT Analyzer or any add-on device or accessory seems to be functioning improperly, please call the OMICRON Hotline (refer to chapter "OMICRON Service Centers" on page 185).

• Do not operate the CT Analyzer when explosive gas or vapors are present.

• Do not operate the CT Analyzer under wet or moist conditions (condensation).

• Do not open the CT Analyzer. Opening the CT Analyzer invalidates all warranty claims. Do not repair, modify, extend, or adapt the CT Analyzer or any accessories.

• Do not insert objects (e.g. screwdrivers, etc.) into the ventilation slots or any input/output sockets.

Safety Rules

CT Analyzer User Manual

• Do not stand right next to or directly underneath a connection point because

• Full compliance with the regulations also includes following the instructions

Orderly Measures

The CT Analyzer User Manual or the e-book version of the manual has always to be available on the site where the CT Analyzer is being used. All users of the CT Analyzer must read and observe the safety rules described in this section and all relevant installation and operation instructions.

The CT Analyzer may be used only as described in this User Manual. Any other use is not in accordance with the regulations. The manufacturer and the distributor are not liable for damage resulting from improper usage. The user alone assumes all responsibility and risk.

Disclaimer

the clamps may fall off and touch you.

provided in this User Manual.

If the equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired.

1 Introduction

1.1 Designated Use

The CT Analyzer is intended to perform automatic testing and calibration of low leakage flux current transformers (i.e., CTs with non-gapped cores) in laboratories as well as on-site in utilities. Testing of CTs with gapped cores is also possible with restricted accuracy. The following tests can be performed using the CT Analyzer:

• Burden measurement

• Residual magnetism measurement of CTs

• CT winding resistance measurement

• CT excitation characteristic measurement according to IEC 61869-2, IEC 60044-1, IEC 60044-6 (TPS, TPX, TPY, TPZ) and IEEE C57.13.

• CT ratio measurement with consideration of a connected burden

• CT phase and polarity measurement

• Determination of accuracy limiting factor, instrument security factor, secondary time constant, symmetrical short-circuit current factor, transient dimensioning factor, remanence factor, knee point voltage/current, class, saturated inductance and non-saturated inductance.

Introduction

Using the Quick Test feature it is also possible to use the CT Analyzer as a versatile multimeter with included power source, e.g. for:

• Quick and easy resistance measurement, e.g. for wiring checks on the secondary side of CTs.

• Quick voltage ratio checks for VTs.

• Measurement of burden values, e.g. to determine the new burden value after changes of the relay equipment. This allows the re-calculation of the CT test results for the new burden value by the CT Analyzer and thus makes it unnecessary to run an additional CT test in order to determine the behavior of the CT with the new burden.

• Quick wiring checks using the CPOL polarity checker from OMICRON. Using the CPOL in combination with the specific test signal provided by the CT Analyzer’s Quick Test feature you can check a series of test points (e.g., the burden wiring) for correct polarity.

The CT Analyzer is intended exclusively for the applications described above. Any other use is deemed not to be according to the regulations. The manufacturer and the distributor are not liable for damage resulting from improper usage. The user alone assumes all responsibility and risk.

CT Analyzer User Manual

Compact Flash card slot

Remote control interface

RS232 interface and USB interface for connecting the CT Analyzer to a PC

Grounding terminal

Keyboard

with cursor keys and card selection keys

Output

Generator output

Display

with context-dependent keys ("soft keys")

Sec, Prim

Measurement inputs

I/0 key

with status LEDs

Mains connection unit

Mains socket with fuse and ON/OFF switch

1.2 Functional Components of the CT Analyzer

1.2.1 Overview

Figure 1-1 provides an overview of the operating and display elements and the connectors of the CT Analyzer.

Figure 1-1 CT Analyzer overview

1.2.2 Mains Connection Unit and Grounding

Mains socket (IEC320)

ON/OFF switch

Grounding terminal (4mm socket combined with knurled nut for clamp connection)

Mains fuse: 2 x T6.3 A / 250 V, high breaking capacity

Compact Flash card Storage medium for test data.

Eject button Press to eject the Compact Flash card.

Figure 1-2 Mains connection unit and grounding terminal

Introduction

1.2.3 Compact Flash Card Slot

Figure 1-3 Compact Flash card slot

CT Analyzer User Manual

RS232 interface

USB interface (type B connector)

1.2.4 Remote Control Interface (PC Connection)

CT Analyzer devices as of serial number JHxxxx or newer are equipped with a USB interface and a RS232 interface. You can use both interfaces alternatively to connect the CT Analyzer to a computer.

OMICRON recommends to use the USB interface since communication via USB is considerably faster than communication via RS232.

Figure 1-4 Remote control interface (RS232 and USB)

Since in this case the CT Analyzer provides two alternative interfaces, the user has to select the interface to be used (or check the selection) in the CT Analyzer settings before connecting the CT Analyzer. The factory default setting for those devices is USB.

1. Open the Main Menu on the CT Analyzer and select Settings.

2. In the Setting Menu page, select Remote Interface.

3. In the Select remote interface port page, select the interface actually used to connect the CT Analyzer to the computer: USB or RS232.

The CT Analyzer will only communicate via the selected interface. It will not be recognized by the computer if the CT Analyzer settings do not match the interface used for connection.

Note: Please refer to the following sections for more information:

I/0

Output

Generator output. AC: 40V

rms

, 5A

rms

DC: 120V, 15A

Sec

Measurement input for secondary side of CT, 150V

max., 500kΩ input impedance

Prim

Measurement input for primary side of CT, 30V

max., 150kΩ input impedance

• Section 2.3 on page 23 for information on how to connect the CT Analyzer to a PC.

• Chapter 5 on page 59 for general information on how to operate the CT Analyzer.

• Section 5.7 on page 65 for more detailed information about the

Setting Menu page.

1.2.5 Inputs and Outputs

Warning: While the red LED of the key is flashing, voltage is applied at

the output and the measurement inputs.

Introduction

Figure 1-5 Inputs and outputs of the CT Analyzer

CT Analyzer User Manual

I/0

1.2.6 I/0 Key with Status LEDs

Red LED on the left, green LED on the right.

I/0 key to start the test.

During the boot process after switching the CT Analyzer on, both LEDs are on. The red LED is switched off when the boot process is finished and the CT Analyzer is ready for operation.

Green LED on: The CT Analyzer is switched on and ready for

Red LED flashing: Test is running.

Red LED steadily on: Device error.

operation.

Warning: While the red LED is flashing, voltage is applied at the output and the measurement inputs.

1.2.7 Display with Soft Keys

Card area with tab

Soft key description fields

Soft keys, labelled by the soft key description fields

If 3 points are visible in the lowermost soft key description field (see dashed arrow), this key can be used to open an additional set of soft keys

Edit fields (underlined by dotted lines)

Status line

Display field (not underlined)

A scrollbar is displayed if the content of a card is too long to be displayed at a time. Use the up/down cursor keys on the keyboard to scroll through the card.

Introduction

Figure 1-6 Display with context-dependent soft keys

The following icons may be displayed in the status line:

Remote control. The CT Analyzer is connected to a computer and a software tool of the CT Analyzer PC Toolset (e.g. the CTA Remote Excel File Loader) running on that computer has established connection to the CT Analyzer.

The keyboard on the CT Analyzer is locked until the running test is finished.

CT Analyzer User Manual

1.2.8 Keyboard

Security key. The data measured with the CT Analyzer can be stored in XML files. Stored files are protected by a security checksum to prevent the data within these files from being edited.

If the CT Analyzer displays the data of a previously stored test, and the data in this file are valid, a key is shown in the status line. If the file data are invalid since someone tried to edit them later, a broken key is displayed.

Note: When loading older files containing no security checksum, no security information is shown.

Overload indication. The CT Analyzer could not output the required test current or take all necessary measurement points due to an overload.

Multi-ratio CT measurement. Indicates that a multi-ratio CT test using the optional CT SB2 switch box has been initialized on the CT Analyzer (here: full tap combination X1-X4).

Figure 1-7 Keyboard

Numeric / character keys for entering values and text.

After pressing a key, the status line displays the character set available for the key. Press the key as often as required to scroll through the displayed character set. After 1 second or after pressing another key, the character selected in the status line is entered into the edit field in the display.

Note: To quickly change between letters and numerics, hold the button pressed for a second.

Introduction

HELP

ESC

Press this key to enter capital letters.

Press this key to display the context-sensitive help system (see section 5.9 on page 76).

Press this key to delete the character left of the cursor position.

Press this key to leave an edit field without applying a change or to leave the edit mode of a card or to go one level back in the user interface level.

The CT-Object card is the top user interface level. Pressing this key several times will always bring you back to the CT-Object card.

Press this key to apply a change for an edit field.

When working in the CT Analyzer file system, use this key to open a selected folder or to confirm to move back to the next higher level in the file structure.

Use the card selector keys to display a specific card.

Use the cursor keys to select an edit field in the user interface or to move the cursor within an edit field.

Use the cursor key to enter the edit mode of a displayed card.

1.3 License-Depending Functional Scope

The functional scope provided by the CT Analyzer depends on the licenses actually available on the device.

This User Manual describes the full functional scope provided when the complete set of licenses is available on the CT Analyzer. A lack of licenses may primarily result in functional restrictions regarding the selectable standards, classes, core types and frequencies as well as the availability of individual measurement functions and/or test cards.

For up-to-date information about the licenses and packages available for the CT Analyzer please refer to the OMICRON website.

CT Analyzer User Manual

1.4 Scope of Delivery, Accessories, Available Licenses

For up-to-date information about the scope of delivery and available accessories and licenses for the CT Analyzer please refer to the OMICRON website or the OMICRON office nearest you.

Setup and Connection

2 Setup and Connection

2.1 General Safety Rules for Connecting and Operating the CT Analyzer

Observe the following general safety rules when connecting and operating the CT Analyzer. The safety rules given here are supplemented by further notes and warnings applicable for specific actions only. Such specific notes and warnings are given where necessary in this user manual.

• Before putting the CT Analyzer into operation, check the test set for visible damages.

• When taking the CT Analyzer into operation, make sure that the air slots, the power switch and the power supply plug at the test set are not obstructed.

• Only use wires with 4mm safety "banana" connectors and plastic housing for connection to the front panel input/output sockets.

• During the test always connect one terminal of the transformer’s primary side to protective earth.

Warning: Make sure that the terminals of the test object to be connected to the CT Analyzer do not carry any voltage potential. During a test, the CT Analyzer is the only permitted power source for the test object.

Warning: Do not touch the equipment under test or the measurement leads while the red LED on the CT Analyzer is flashing. Never connect or disconnect measurement leads while the red LED on the CT Analyzer is flashing.

As long as the red LED is flashing, the output is active and lethal voltages can occur due to the high energy stored in external inductors.

Warning: Always make sure that the CT Analyzer output is connected to the correct side of the current transformer according to the wiring instructions given in sections 2.4 to 2.5 below. Accidentally mixing up the windings can cause lifethreatening voltages within the transformer and/or destroy the connected CT or the CT Analyzer!

CT Analyzer User Manual

Warning: Feeding test voltage to a tap of a multi-ratio CT can cause life-

threatening voltages on other taps with higher ratios. Do not touch these taps!

Using the optional CT SB2 switch box can make the testing of multi-ratio CTs much safer. If necessary, the CT Analyzer then reduces the test voltage in a way that the maximum possible voltage within the measurement setup (i.e., the voltage occurring at the tap combination with the highest ratio) is limited to 200V.

2.2 Setting Up the CT Analyzer

Proceed as follows to set up the CT Analyzer:

1. Make sure to position the CT Analyzer on dry, solid ground.

2. Connect the grounding terminal on the CT Analyzer’s side panel (see section

1.2 on page 12) to protective ground (PE). Use the original cable supplied by OMICRON or alternatively a solid connection of at least 6mm point as close as possible to the test object.

3. Connect the CT Analyzer to mains using the supplied power cord. Supply the CT Analyzer only from a power outlet that is equipped with protective ground (PE). An error message (901) appears if the PE connection is defective or if the power supply has no galvanic connection to ground.

. Use a ground

Warning: The error message 901 is a safety relevant message! This message may appear if protective ground or equipotential ground is not connected properly or if the power supply does not have galvanic connection to ground, which can be the case in very special grid applications or if the CT Analyzer is supplied by a generator or an isolating transformer. For safe operation always make sure that protective ground and equipotential ground are connected properly.

4. Connect the equipment under test according to the instructions given in this manual. Refer to sections 2.4 and 2.5 for detailed descriptions how to connect the CT Analyzer for a specific measurement and/or application.

Setup and Connection

to PC

USB A/B

CT Analyzer settings:

Main Menu -> Settings -> Remote Interface -> USB

CT Analyzer settings:

Main Menu -> Settings -> Remote Interface -> RS232

to PC

RS232

(crossover)

RS232/USB

adapter

CT Analyzer settings:

Main Menu -> Settings -> Remote Interface -> RS232

to PC

RS232

(crossover)

2.3 Connecting the CT Analyzer to a PC (optional)

CT Analyzer devices as of serial number JHxxxx or newer are equipped with a USB interface and a RS232 interface. You can use both interfaces alternatively to connect the CT Analyzer to a computer.

Proceed as follows to connect the CT Analyzer to a PC:

1. Select the interface to be used (or check the selection) in the CT Analyzer settings:

– Open the Main Menu on the CT Analyzer and select Settings.

– In the Setting Menu page, select Remote Interface.

– In the Select remote interface port page, select the interface actually

used to connect the CT Analyzer to the computer: USB or RS232.

2. Connect the CT Analyzer to the PC using a RS232 cable or a USB cable as shown in the following figure.

CT Analyzer connected via USB

CT Analyzer connected via RS232 interface and a RS232/USB adapter on

the PC side

CT Analyzer connected via RS232 interface

Figure 2-1 Connecting the CT Analyzer to a PC

CT Analyzer User Manual

2.4 Connection for Usual Applications

2.4.1 Wiring for a CT Test

This section shows the basic wiring of the CT Analyzer for a CT test.

Observe the general safety rules in section 2.1 on page 21 and the hints and instructions for improving the quality of the measurement results given in section

2.7 on page 42.

Warning: Feeding test voltage to a tap of a multi-ratio CT can cause lifethreatening voltages on other taps with higher ratios. Do not touch these taps!

Caution: The grounded terminal on the secondary side of the CT always has to be connected to the black sockets of input "Sec" and the "Output" of the CT Analyzer. Connecting the red sockets of the CT Analyzer to PE can result in incorrect measurement and/or cause an automatic abortion of the measurement with an error message.

Caution: If it is necessary to use clamps for the connection of the measurement leads to the secondary side of the test object, always use the 4-wire connection technique as described in section 2.7.1 on page 42 in order to avoid measurement errors.

For a CT test, connect the CT Analyzer as shown in Figure 2-2:

1. Make sure that the primary side of the CT is connected to PE on one side and open on the other side.

Caution: It is absolutely important to avoid coupling of interferences into the primary circuit during measurement. Therefore, connect the side of the primary circuit that is able to receive more interferences to PE (e.g. the side with the longer line length). The ungrounded side should be the side that receives less interferences (refer to Figure 2-2).

2. Disconnect the hot side of all secondary windings of the CT in order to remove any load from the CT. Every kind of load remaining on the secondary side of the CT during measurement leads to incorrect measurement results or error messages.

3. Connect the black socket of CT Analyzer input "Prim" to the grounded side of the CT’s primary circuit and the red socket of this input to the open (ungrounded) side.

Setup and Connection

Utility line

Prevent coupling of interferences into the primary circuit (e.g. by disconnecting the utility line, switching off the breaker, etc). Coupling of interferences into the ungrounded connection influences the measurement results.

The side that is able to receive more interferences has to be connected to PE.

4. Connect the black "Output" socket and the black socket of input "Sec" of the CT Analyzer to that terminal on the secondary side of the CT that is connected to PE.

5. Connect the red "Output" socket and the red socket of input "Sec" of the CT Analyzer to the other (ungrounded) terminal on the secondary side of the CT.

Figure 2-2 Basic wiring for a CT test

Note: The CT may make humming or buzzing noises of varying frequency during the CT test. This is completely normal and does not indicate a defective CT.

CT Analyzer User Manual

CT Burden

2.4.2 Wiring for a Burden Test

For a burden test, connect the CT Analyzer as shown in Figure 2-3. Observe the general safety rules in section 2.1 on page 21.

1. Open the connection line to the ungrounded side of the CT (refer to Figure 2-3).

Caution: If you do not disconnect the CT for the burden test, the CT Analyzer measures the parallel impedance of the burden and the CT winding instead of the burden itself. Although in many cases the impedance of the CT is many times higher than the burden impedance, this will cause a measuring error.

The CT Analyzer does not perform demagnetization after burden measurement. Therefore, CT saturation could occur if you do not disconnect the CT prior to the burden test.

2. Connect the black "Output" socket and the black socket of input "Sec" of the CT Analyzer to that side of the burden that is connected to PE.

3. Connect the red "Output" socket and the red socket of input "Sec" of the CT Analyzer to the other (ungrounded) side of the burden.

Figure 2-3 Basic wiring for a burden test

Setup and Connection

Utility line Utility line

2.4.3 Wiring for Primary Resistance Measurement

For the primary winding resistance measurement, connect the CT Analyzer as shown in Figure 2-4. Observe the general safety rules in section 2.1 on page 21.

1. Make sure that the primary side of the CT is connected to PE on one side and open on the other side.

3. Connect the black socket of CT Analyzer input "Prim" to the grounded side of the CT’s primary winding and the red socket of this input to the open (ungrounded) side.

4. Connect the black "Output" socket of the CT Analyzer to the grounded side of the CT’s primary winding and the red "Output" socket to the ungrounded side of the primary winding.

Figure 2-4 Basic wiring for primary winding resistance measurement

CT Analyzer User Manual

Air gap

Position 2

Ratio error measured: +5%

Position 1

Ratio error measured: +0.5%

Position 3

Ratio error measured: -15%

Primary wire

2.5 Connection for Special Applications

2.5.1 Measurement on a Gapped Core

For gapped cores, the position of the primary wire inside the core has a large influence on the ratio measurement results.

Therefore, in order to obtain correct measurement results, it is very important to arrange the primary wire during measurement to the same position inside the core as it is during real operation. Depending on the position of the primary wire inside the core, the measured ratio can differ by up to 20%.

The figure below shows how the ratio error can differ depending on the position of the primary wire inside the core.

Figure 2-5 Ratio error depending on the position of the primary wire inside

As shown in Figure 2-5, the measured ratio error may differ considerably depending on the position of the primary wire. Best measurement results are obtained if the primary wire is positioned exactly in the center of the core. As an alternative, a copper foil formed to a ring and placed to the inner side of the core can be used as shown in Figure 2-6.

the gapped core

Setup and Connection

Copper foil

Figure 2-6 Using a copper foil formed to a ring as primary wire

Note: Exact measurement results are only possible if the primary wire is positioned exactly in the center of the core.

The CT Analyzer does not consider leakage inductances. The leakage inductances are neglected instead. This way, the CT Analyzer is able to reach a measurement error of approx. 0.1% for class PR and class TPY CTs and approx. 0.8% for class TPZ CTs.

2.5.2 Excitation Curve Measurement for an Unwound Iron Core

Using the CT Analyzer it is possible to measure the magnetic properties of an empty, unwound iron core. For this purpose, it is necessary to apply an "auxiliary winding" of at least 20 turns to the core.

For this purpose, OMICRON offers a special cable with 23 turns (VEHK0658) and a special Microsoft Excel template for the required calculations.

Proceed as follows to perform the measurement (refer to Figure 2-7 and Figure 2-8). Observe the general safety rules in section 2.1 on page 21.

1. Apply the "auxiliary winding" cable to the unwound core.

2. Connect the "Output" sockets and input "Sec" of the CT Analyzer to the cable as shown in Figure 2-7. For cores that require high currents to reach the knee point, several cables can be cascaded to increase the number of turns, see Figure 2-8.

3. Start the CTA Remote Excel File Loader with the special Excel template mentioned above.

4. Enter the iron parameters to the template.

CT Analyzer User Manual

Iron core without winding

23 turns auxiliary winding

Figure 2-7 Excitation curve measurement using one "auxiliary winding"

cable

Figure 2-8 Excitation curve measurement using several cascaded

"auxiliary winding" cables

2.5.3 Measurement on a GIS (SF6) Switch Gear

Proceed as follows to perform measurements on a GIS (SF6) switch gear (refer to Figure 2-9). Observe the general safety rules in section 2.1 on page 21.

1. Disconnect all utility lines.

2. Open all circuit breakers to the bus bars.

3. Close the earthing switch.

4. Connect one secondary side terminal of the CT to protective earth.

Setup and Connection

Utility line disconnected

100m max.

Gas insulated busbar

Earthing switch

Circuit breaker

3m max.

Burden

Coax measurement cables

5. Connect the secondary side of the CT to the "Output" sockets and input "Sec" of the CT Analyzer:

• Connect that side of the CT that is connected to PE to the black sockets

of the CT Analyzer.

• Connect that side of the CT that is open to the red sockets of the

CT Analyzer.

6. Connect the primary side of the CT to CT Analyzer input "Prim". Make sure that the polarity is correct (same colors on same polarity).

Figure 2-9 Measurement on a GIS (SF6) switch gear

CT Analyzer User Manual

2.5.4 Measurement on Bushing-Type CTs

Measurement on a Bushing-Type CT

Proceed as follows to perform measurements on a bushing-type CT (refer to Figure 2-10). Observe the general safety rules in section 2.1 on page 21.

1. Disconnect all utility lines from the transformer (i.e., isolate the transformer from the energized power system).

2. Connect all transformer terminals that are not used for measurement (in this example H2 and H3) to protective earth (PE) in order to minimize the external disturbances. External disturbances can influence the measurement results because the bushings are acting as an antenna.

3. Connect terminal H0 to protective earth.

4. Connect one secondary side terminal of the CT to protective earth.

5. Connect the secondary side of the CT to the "Output" sockets and the "Sec" sockets of the CT Analyzer:

• Connect that side of the CT that is connected to PE to the black sockets

of the CT Analyzer.

• Connect that side of the CT that is open to the red sockets of the

CT Analyzer.

6. Connect the primary side of the CT to CT Analyzer input "Prim". Make sure that the polarity is correct (same colors on same polarity).

7. Short-circuit and ground the free winding on the measured transformer leg to reduce the impedance of the winding that is connected in series to the primary side of the CT. The input impedance of CT Analyzer input "Prim" is only approx. 330k winding of that leg is short-circuited.

8. If the transformer has a tap changer installed, the position of the tap changer should be changed to a position where the regulation winding is completely bridged in order to ensure that the regulation winding cannot act as a voltage divider together with the main winding of the transformer.

Ω and can thus influence the measurement results, if no

Setup and Connection

(Mp)

(N)

H3 (C)

(W)

H2 (B) (V)

H1 (A) (U)

Coax measurement cables

Figure 2-10 Measurement on a bushing-type CT

Note: Primary terminal H1 must be open. Otherwise the primary side is shorted and the CT Analyzer cannot obtain proper results.

Measurement on a Y (Wye) Winding Transformer

For measurements on current transformers in Y-connected transformer windings it has to be assured that the main impedance of the transformer does not influence the measurement results.

The CT Analyzer has an input impedance of approx. 330kΩ. This measurement impedance can be low enough to influence the measurement results. In order to prevent any influence of the CT Analyzer's input impedance to the measurement results, the transformer winding at the same leg should be short-circuited. Shortcircuiting the windings on all legs of the transformer is even better.

Furthermore, all bushing terminals that are not connected to the CT Analyzer should be connected to protective earth in order to prevent influence of external disturbances (see Figure 2-11).

CT Analyzer User Manual

Figure 2-11 Measurement on a Y winding transformer

Measurement on a Δ (Delta) Winding Transformer

CTs outside the delta winding

For CTs that are located in the bushing outside of the delta winding (Figure 2-12), no delta compensation is needed.

In this case, only two parallel transformer windings are connected in series to the CT. This connection method provides least possible influence to the measurement result for the winding resistance of the CT.

The Y winding and the remaining windings of the power transformer's delta winding are short-circuited to avoid influence of the induced flux of the power transformer's core to the measurement.

Setup and Connection

Figure 2-12 Bushing-type CT outside the delta winding power transformer

CTs inside the delta winding

For CTs that are integrated in the delta winding of the transformer, it is not possible to read the CT ratio directly since the delta winding acts as a voltage divider. In order to obtain the correct CT ratio, the ratio value determined by the CT Analyzer has to be corrected.

For this purpose, the CT Analyzer provides a "Delta Compensation" field on the CT- Object card where you can select the delta compensation factor depending on the bushing terminals that are used for primary signal measurement.

Figure 2-13 Setting the delta compensation on the CT-Object card

CT Analyzer User Manual

If it is possible to short-circuit the transformer winding at the same leg as the primary measurement is done (see Figure 2-15), the measurement should be performed with the winding short-circuited. In this case, no delta compensation is required since the voltage induced on the transformer’s secondary winding is zero and thus the voltage induced on the primary side of the transformer is also zero.

For the measurement setup shown in Figure 2-14, the delta compensation factor on the CT-Object card has to be set to "Ratio 2/3" (see Figure 2-13).

If input "Prim" is connected between L1 and L2, the delta compensation has to be set to "Ratio 1/3".

Figure 2-14 Measurement setup for delta compensation "Ratio 2/3"

In the configuration shown in Figure 2-15, no delta compensation is required since the main winding of the power transformer is short-circuited on the other side. This avoids the induction of flux in the main winding of the power transformer that could influence the measurement results.

Setup and Connection

Figure 2-15 Measurement setup for delta compensation "Ratio 1"

CT Analyzer User Manual

2.5.5 VT Ratio Measurement Using QuickTest

To measure the ratio of VTs using the CT Analyzer, you can either use the Quick Test function of the CT Analyzer (see chapter 8 on page 135) or the CTA QuickTest PC tool which is part of the CT Analyzer PC Toolset.

Observe the general safety rules in section 2.1 on page 21.

Warning: For VT ratio measurement using the Quick Test feature, the CT Analyzer output has to be connected to the primary side of the VT.

Connecting the CT Analyzer output to the secondary side of the VT by mistake will cause hazardous voltages on the primary side!

For VT ratio measurements using Quick Test, connect the CT Analyzer as shown in Figure 2-16. For a detailed description on how to perform such measurements, please refer to section 8.7 on page 151.

1. Connect the "Output" sockets and input "Sec" of the CT Analyzer to the primary side of the VT.

2. Connect input "Prim" of the CT Analyzer to the secondary winding of the VT.

Figure 2-16 Connecting the VT for ratio measurement using the

CT Analyzer

Setup and Connection

2.5.6 VT Winding Resistance Measurement Using QuickTest

To measure the winding resistance of VTs using the CT Analyzer, you can either use the Quick Test function of the CT Analyzer (see chapter 8 on page 135) or the CTA QuickTest PC tool which is part of the CT Analyzer PC Toolset.

Observe the general safety rules in section 2.1 on page 21.

For VT winding resistance measurements using Quick Test, connect the CT Analyzer as shown in Figure 2-17. For a detailed description on how to perform such measurements, please refer to section 8.8 on page 154.

Connect the "Output" sockets and input "Sec" of the CT Analyzer to the winding to be measured.

Figure 2-17 Connecting the VT for winding resistance measurement using

the CT Analyzer

2.5.7 Polarity Check Using QuickTest and the CPOL Polarity Checker

Observe the general safety rules in section 2.1 on page 21.

For the polarity check using Quick Test, connect the CT Analyzer as shown in Figure 2-18. For a detailed description on how to perform the polarity check, please refer to section 8.5 on page 145.

1. Ensure that the ungrounded side of the CT winding is not connected to the wiring to be checked.

2. Connect the black "Output" socket and the black socket of input "Sec" of the CT Analyzer to that side of the burden that is connected to PE.

CT Analyzer User Manual

Burden

CPOLCPOL



3. Connect the red "Output" socket and the red socket of input "Sec" of the CT Analyzer to the other (ungrounded) side of the burden.

Figure 2-18 Wiring for a polarity check of the burden wiring using Quick Test

and the CPOL polarity checker

Note: The CT Analyzer measures the voltage of the injected signal using input "Sec". Therefore, you should always connect this input when using the Polarity Check measurement type. The higher the resistance of the wiring checked (i.e., the burden wiring) or the current amplitude set on the CT Analyzer, the higher the terminal voltage generated by this current!

2.6 Disconnection

Proceed as follows to disconnect the CT Analyzer:

1. Wait until the red LED on the CT Analyzer is off.

Warning: Never disconnect measurement leads while the red LED on the CT Analyzer is flashing. As long as the red LED is flashing, the output is active and lethal voltages can occur due to the high energy stored in external inductors.

2. Disconnect the measurement leads starting at the CT Analyzer.

Setup and Connection

CT Analyzer User Manual

The measurement leads from the "Output" sockets and input "Sec" of the CT Analyzer are connected to the test object via separate clamps.

One clamp is used for each measurement lead! Correct!

Separate measurement leads are used for the "Output" sockets and input "Sec" of the CT Analyzer, but the measurement leads are connected to the test object via a common clamp.

Two measurement leads use one single clamp! Do not use!

Do not use!

4-wire connection 2-wire connection

2.7 Improving the Quality of Measurement Results

2.7.1 4-Wire Measurement vs. 2-Wire Measurement

If the secondary side of the test object does not provide screw terminals for connecting the delivered terminal adapters or banana sockets to insert the measurement leads directly, and it is therefore necessary to use clamps (e.g. crocodile clamps or Kelvin clamps) for the connection of the measurement leads, always use the 4-wire connection technique as described below.

Otherwise, the possibly existing contact resistance of the clamps could affect the measurement results, i.e., the CT Analyzer possibly delivers incorrect measurement results.

Both connection techniques are shown in the following figure.

Figure 2-19 Demonstration of 2-wire and 4-wire connection technique

2.7.2 Noise Reduction Techniques

For proper test results it is important to consider the following:

• If possible, disconnect both primary terminals of the CT from the utility lines.

• If possible, always use the original coax measurement cables delivered by OMICRON. If it is necessary to use loose single-wire measurement cables, twist the wires to a twisted-pair line. Avoid open loops consisting of individual single-wire measurement cables in order to prevent interference voltages caused by magnetic fields.

• Connect one terminal of the CT’s primary side to protective earth. If it is not possible to disconnect the utility lines from both primary terminals, connect that side of the primary circuit that is able to receive more interferences to PE (the primary side that is still connected to the utility lines or the side with the longer line length, respectively). The ungrounded side should be the side that receives less interferences.

• When testing a CT in a utility, take care that one side of the CT is connected to PE and at least the ungrounded terminal is disconnected from all utility lines.

Refer to Figure 2-20.

Setup and Connection

Note: Do not connect both primary terminals to PE! This would cause

incorrect measurement results. Connecting both primary terminals to PE has the same effect as a short-circuit in the CT.

CT Analyzer User Manual

Utility line

Connection required if secondary side terminal cannot be disconnected

Burden

Use coax measurement cables!

Figure 2-20 Noise reduction for CT measurement

Short Guide for Running a CT Test

3 Short Guide for Running a CT Test

This chapter provides a short guide for running a CT test using the CT Analyzer. This short guide is intended as an overview of a complete test procedure. For more detailed information, please refer to chapter 4 on page 49.

This short guide does not consider the residual magnetism measurement (see section 6.4 on page 102) and does not use the guesser function of the CT Analyzer (see chapter 7 on page 131).

When working with the CT Analyzer, always observe the safety rules given in section 2.1 on page 21.

Note: The CT may make humming or buzzing noises of varying frequency during the CT test. This is completely normal and does not indicate a defective CT.

As long as the red LED is flashing, the output is active and lethal voltages can occur due to the high energy stored in external inductors.

Warning: Always make sure that the CT Analyzer output is connected to the correct side of the current transformer according to the wiring instructions given in sections 2.4 and 2.5. Accidentally mixing up the windings can cause lifethreatening voltages within the transformer and/or destroy the connected CT or the CT Analyzer!

Warning: Feeding test voltage to a tap of a multi-ratio CT can cause lifethreatening voltages on other taps with higher ratios. Do not touch these taps!

CT Analyzer User Manual

Set up the CT Analyzer

-> 2.2 on page 22

Switch the CT Analyzer on and

display the CT-Object card

-> 4.2 on page 50

Select test cards

-> 4.2, step 2. on page 50

Enter CT name plate data

-> 4.2, step 3. on page 51

Burden test card

enabled?

Select test current for

burden test

-> 4.2, step 4. on page 52

Start test

-> 4.3, step 1. on page 52

see next page

Yes

Test execution:

Burden test

Test finished message

-> 4.3, step 11. on page 54

Disconnect or perform new test

-> 4.5 on page 57

Burden test card

enabled?

Connect CT Analyzer

for burden test

-> 2.4.2 on page 26

Start Test

soft key

Skip Test

soft key

Cancel Test

soft key

Connect CT Analyzer

for CT test

-> 2.4.1 on page 24

Prim.

Winding Resistance

measurement

enabled?

Connect CT Analyzer for

primary winding resistance

measurement

-> 2.4.3 on page 27

Start Test

soft key

Skip Test

soft key

Cancel Test

soft key

View results

-> 4.4 on page 55

Start Test

soft key

Skip Test

soft key

Cancel Test

soft key

Test execution:

CT test

from previous page

Yes

Test execution:

Prim. winding resistance

measurement

Residual Magnetism

measurement if enabled

-> 6.4 on page 102

Short Guide for Running a CT Test

CT Analyzer User Manual

Running a CT Test (Detailed)

4 Running a CT Test (Detailed)

This chapter provides a detailed description how to run a CT test using the CT Analyzer. Follow the sections 4.1 to 4.5 in the given order.

The example CT test described below does not use the guesser function, which is an aid for the user to find out single unknown name plate data of a CT, for example if parts of the CT’s name plate are unreadable. For detailed information about the guesser function, please refer to chapter 7 on page 131.

When working with the CT Analyzer, always observe the safety rules given in section 2.1 on page 21.

Note: The CT may make humming or buzzing noises of varying frequency during the CT test. This is completely normal and does not indicate a defective CT.

As long as the red LED is flashing, the output is active and lethal voltages can occur due to the high energy stored in external inductors.

Warning: Feeding test voltage to a tap of a multi-ratio CT can cause lifethreatening voltages on other taps with higher ratios. Do not touch these taps!

CT Analyzer User Manual

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4.1 Setting Up the CT Analyzer

1. Set up the CT Analyzer as described in section 2.2 on page 22.

4.2 Preparing and Configuring the Test

1. Proceed as follows to display the CT-Object card with a new CT test.

If the CT Analyzer is already switched on:

– If necessary, display the CT-Object card and then press the Main soft key

to display the main menu.

– In the main menu, select "New CT Test" and press the OK soft key to

initialize a new CT test.

– The display shows the CT-Object card, ready to start a test.

If the CT Analyzer is switched off:

– Switch the CT Analyzer on.

– After the boot process is finished, the green LED is on and the red LED is

off.

– The display shows the CT-Object card, ready to start a test.

2. For reasons of simplicity, we do not want to perform a residual magnetism measurement in our example CT test described here. Press the Select Cards soft key in the CT-Object card to open the Select Cards page. Check, and if necessary make the following test card selection (see Figure 4-1):

The following test cards are required: CT-Object, Burden, Primary Winding

Resistance, Secondary Winding Resistance, Excitation, Ratio and Assessment.

The Residual Magnetism test card is not required. Deselect it if necessary.

Figure 4-1 Select Cards page

When finished, press the Back soft key to return to the CT-Object card.

Running a CT Test (Detailed)

3. Enter the CT name plate data listed in the table below to the CT-Object card (see Figure 4-2).

Figure 4-2 CT-Object card with name plate data entered

I-pn Rated primary current of the CT.

I-sn Rated secondary current of the CT.

Standard Standard to be used for the CT test and the test assessment.

P/M CT type. Set "P" for a protection CT or "M" for a metering CT.

Class Rated accuracy class of the CT. This field becomes available

after selecting the CT type (protection CT or metering CT).

VA Rated power of the CT.

Note: For protection CTs of the IEEE C57.13 classes C, K and T, the VA parameter is not available. Enter the rated secondary terminal voltage V

instead (see also "Specific

parameters and settings displayed for IEEE C57.13 protection CTs" on page 98).

Note: Depending on the selected standard and CT type, other or further CT data may be necessary for a correct assessment. If the "Check "*" settings before start" option is enabled in the default test settings (see section

5.7.3 on page 70), all parameters that are required for assessment are marked by a star "*" in the CT-Object card. In this case, no automatic assessment will be available if you do not enter data for one or more parameters marked by a star "*" (see section 6.2.3 on page 82).

CT Analyzer User Manual

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4. If you enabled the Burden test card in step 2., display the Burden card and specify the test current for the burden measurement. Use the default test current derived from the I a test current of your choice to the "I-test" parameter.

Figure 4-3 Defining the test current in the Burden card

previously entered in the CT-Object card or enter

4.3 Running the Automatic Test and Connecting the CT Analyzer

1. Start the test by pressing the key. The red LED flashes to indicate that the CT test is running.

2. If you enabled the Burden test card in section 4.2, step 2. on page 50 a message is displayed, asking you to change the wiring for the burden test. Connect the burden as described in chapter 2.

– Make sure that the red LED on the CT Analyzer is off.

– Refer to section 2.4.2 on page 26 for detailed information on how to

connect the CT Analyzer for the burden test.

– You can display the connection diagram by pressing the key while

the wiring check message is displayed.

Figure 4-4 Burden test: Wiring check message (left) and wiring diagram

(right)

3. Press the Start Test soft key to execute the automatic burden test.

Note: If you do not want to perform the burden test, press Skip Test to skip the burden test and continue with the next test step or Cancel Test to abort the complete test.

Running a CT Test (Detailed)

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Note: If the "Continuous burden measurement" option is enabled in the Settings (see section 5.7.3 on page 70), the burden test has to be stopped manually by pressing the key.

4. If you enabled the Primary Winding Resistance test card in section 4.2, step 2. on page 50, a message is displayed, asking you to change the wiring for the primary winding resistance measurement. Connect the primary winding of the CT as described in chapter 2.

– Make sure that the red LED on the CT Analyzer is off.

– Refer to section 2.4.3 on page 27 for detailed information on how to

connect the CT Analyzer for the primary resistance measurement.

– You can display the connection diagram by pressing the key while

the wiring check message is displayed.

Figure 4-5 Primary winding resistance measurement: Wiring check

message (left) and wiring diagram (right)

5. Press the Start Test soft key to execute the automatic primary winding resistance measurement.

Note: If you do not want to perform the primary winding resistance measurement, press Skip Test to skip the primary winding resistance measurement and continue with the CT test or Cancel Test to abort the complete test.

6. A message is displayed asking you to change the wiring for the CT test. Connect the CT to the CT Analyzer as described in chapter 2.

– Make sure that the red LED on the CT Analyzer is off.

– Refer to section 2.4.1 on page 24 for detailed information on how to

connect the CT Analyzer for the CT test.

– Be sure that the polarity of all wires is correct.

– You can display the connection diagram by pressing the key while

the wiring check message is displayed.

Note: If you do not want to execute the CT test, press the Skip Test soft key instead of changing the wiring. This will skip the CT test and immediately perform the demagnetization cycle to finish the test.

CT Analyzer User Manual

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7. Press the Start Test soft key to execute the automatic CT test.

8. Automatic test step 1: CT resistance measurement

9. Automatic test step 2: Determination of the excitation characteristic

Figure 4-6 CT test: Wiring check message (left) and wiring diagram

(right)

Note: If you do not want to perform the CT test, press Skip Test to skip the CT test or Cancel Test to abort the complete test.

The CT Analyzer measures the secondary winding resistance of the CT.

The CT Analyzer measures the excitation curve and determines the knee point and other important CT data.

10.Automatic test step 3: Ratio measurement

The CT Analyzer then measures the current ratio error, the phase error, the composite error and the polarity. The CT Analyzer calculates the ratio error for the operating burden (parameter "Burden" in the CT-Object card) and the nominal burden (parameter "VA" in the CT-Object card).

11."Test finished" message

When the test is over, the red LED stops flashing and the green LED is on.

The CT Analyzer displays a "Test finished" message showing the status of the test execution and the overall test assessment (see Figure 4-7).

Press any key on the keyboard to close this message.

Figure 4-7 Test finished message when the test is over

Note: The test results and settings of each test finished with the "Test ok" status are automatically stored to the file OMICRON\AutoSave\ CTAnalyzer.xml on the Compact Flash card. The existing CTAnalyzer.xml file is overwritten with each successful test. Tests that could not be finished successfully or that were aborted by the user are not stored and thus do not overwrite the existing CTAnalyzer.xml file.

4.4 After the Test is Finished

After the test is finished, the CT-Object card displays the CT data determined during the test (refer to Figure 4-8).

Figure 4-8 CT-Object card after the test is finished

Running a CT Test (Detailed)

Now, you can enter the "Location" and "Object" details and save the test (use the cursor keys to scroll within the card and select edit fields).

Figure 4-9 CT-Object card after the test, ready to enter location details

(left) and after saving the test (right)

The assessment of the individual parameters can be viewed on the Assessment card (Figure 4-10).

Figure 4-10 Assessment card after the test is finished

CT Analyzer User Manual

If desired, you can view the individual measurement results acquired during the test by viewing the Burden, Resistance, Excitation and Ratio cards, as shown in the following figures 4-11 to 4-14.

Figure 4-11 Burden card with measurement results after the test is finished

Figure 4-12 Resistance card with measurement results after the test is

finished

Figure 4-13 Excitation card with measurement results after the test is

finished

Figure 4-14 Ratio error and phase displacement at operating burden after

the test is finished

4.5 Disconnection

After the CT test is finished, disconnect the CT under test from the CT Analyzer.

1. Wait until the red LED on the CT Analyzer is off.

2. Disconnect the measurement leads starting at the CT Analyzer.

Running a CT Test (Detailed)

CT Analyzer User Manual

Operating and Configuring the CT Analyzer

...

1st set of soft keys

Press

2nd set of soft keys

5 Operating and Configuring the

CT Analyzer

5.1 Working in the User Interface

5.1.1 Displaying a Specific Card

To display a specific card, select the card by pressing the card selection keys. The card’s tab showing the name of the selected card is then highlighted (see Figure 5-1).

Figure 5-1 CT-Object card selected

5.1.2 Using the Soft Keys

Using the soft keys you can operate the CT Analyzer and change the user interface level of the software.

The functionality of the soft keys is context-dependent, i.e., the software offers different functions or selectable sets of parameters depending on the focus (i.e., depending on which card or field is highlighted or selected in the user interface).

If the lowermost soft key description field contains 3 points (see Save As in Figure 5-1), additional soft key functions are available. Then you can switch the set of displayed soft keys using the key located below the soft keys (see Figure 5-2).

Figure 5-2 Switching the set of soft keys in the CT-Object card

CT Analyzer User Manual

Display field (selection not possible)

Edit field

Edit field selected

ESC

Press the Main soft key in any test card

-> Main Menu

How to get there:

5.1.3 Editing a Card

To open the edit mode for a displayed card, press the cursor key. The card’s tab is then no longer highlighted (see Figure 5-3). Use the cursor keys to move the cursor and to select the desired edit field. Some edit fields have soft keys assigned. The soft keys available for an edit field are displayed if the field is selected.

Figure 5-3 Edit field selected in the CT-Object card

Proceed as follows to edit a card:

1. Select the edit field using the cursor keys.

2. Enter or edit the value or text:

– Select an entry offered by the soft keys (if available)

– or enter the value or text using the keyboard and then press the key

to confirm your input or use the key to leave an edit field without applying and saving the entry.

3. Leave the edit mode either by moving the cursor to the card’s tab using the cursor key or by pressing the key. The focus is then set to the

card’s tab again (tab highlighted).

5.2 The Main Menu

The Main Menu can be opened from any test card by pressing the Main soft key. The items in the list can be selected using the cursor keys. When an item is selected (highlighted), the soft keys are labeled with the functions available for this specific item.

Figure 5-4 Main Menu page

5.3 New CT-Test

Press the Main soft key in any test card

Main Menu:

- New CT-Test

OK soft key

-> CT-Object card

How to get there:

Press the Main soft key in any test card

Main Menu:

- New MR-Test

OK soft key

-> CT-Object card

How to get there:

Press the Main soft key in any test card

Main Menu:

- New Quick-Test

OK soft key

-> CT-Quick card

How to get there:

By selecting "New CT-Test" in the main menu and then pressing the OK soft key, a new CT test with the default parameter settings is loaded and displayed in the CT-Object card. Some of the default values can be defined in the default test settings (see section 5.7 on page 65).

Figure 5-5 CT-Object card with default test settings after initializing a new

Note: For more detailed information about the parameters and fields in the CT-Object card, please refer to section 6.2 on page 80.

Operating and Configuring the CT Analyzer

CT test

5.4 New MR-Test

Using the "New MR-Test" option in the main menu you can initialize a new multiratio CT test using the optional CT SB2 switch box.

This option is only available if you have purchased a corresponding license. For more detailed information about multi-ratio CT testing using the CT SB2, please refer to the CT SB2 User Manual.

5.5 New Quick-Test

Using the "New Quick-Test" option in the main menu you can open the optional QuickTest feature. With this feature you can use the CT Analyzer as a multimeter or perform polarity checks using the CPOL polarity checker.

This option is only available if you have purchased a corresponding license. For more detailed information about QuickTest, please refer to chapter 8 on page 135.

CT Analyzer User Manual

Press the Main soft key in any test card

Main Menu:

- File Handling

Select soft key

-> File Menu page

How to get there:

5.6 File Handling

5.6.1 Available Functions

In the File Menu page you can access all available file operation functions by selecting the entry using the cursor keys and then pressing the Select soft key.

Figure 5-6 File Menu page

Load Report Loading an existing report or settings file from the

Compact Flash card.

You can also load a file by pressing the Load soft key in the CT-Object card.

Save As Saving the current file to the Compact Flash card.

Saving a file is described in detail on page 64.

Delete File Deleting a selected file or folder from the Compact Flash

card.

Only empty folders can be deleted. If you try to delete a folder still containing files or subfolders, an error message is displayed.

To select several neighboring files at a time, keep the

key pressed while selecting the files or folders

using the cursor keys.

Rename File Renaming a selected file on the Compact Flash card.

Only files can be renamed. Renaming of folders is not possible on the CT Analyzer.

Copy / Cut / Paste File(s)

Copying or cutting a file on the Compact Flash card and pasting it at another location on the Compact Flash card.

Copying/cutting and pasting a file is described in detail on page 64.

Format CF card Formatting the Compact Flash card. All data on the

Compact Flash card will be lost!

Note: In the CT Analyzer file system, the root directory can contain a maximum

Press the Main soft key in any test card

Main Menu:

- File Handling

Select soft key

File Menu:

- Load Report or

- Save As or

- Delete File or

- Rename File or

- Copy File(s) or

- Cut File(s) or

- Paste File(s)

How to get there:

Press the Main soft key in any test card

Main Menu:

- File Handling

Select soft key

File Menu:

- Save As or

- Paste File(s)

How to get there:

of 240 files and the file name length (incl. the path) is limited to 240 characters.

5.6.2 Working in the File System

After selecting one of the available file operation functions in the File Menu, the file system card is displayed showing the current path in its title bar and the file system elements in the card area (refer to Figure 5-7).

Navigating in the file system

• To open a folder, select its entry (see Figure 5-7, left) using the cursor keys and then press the key.

• To go one level higher in the directory structure, select the "one level higher" entry and then press the key.

Operating and Configuring the CT Analyzer

Figure 5-7 File system card for loading a report

Creating a new folder

Creating a new folder is only possible for the functions Save As and Paste File(s) of the File Menu.

To create a new folder in the file system, select Save As or Paste Files(s) in the file menu and then navigate to the desired location in the file system where you want to create the new folder. Then press the New Dir soft key. A new folder with an empty name is created. Enter a name for the folder and press the key.

Figure 5-8 File system card after creating a new folder

Note: In the CT Analyzer file system, a directory can contain a maximum of 240 files and the maximum file name length is 240 characters. Renaming of folders is not supported by the CT Analyzer.

CT Analyzer User Manual

Press the Main soft key in any test card

Main Menu:

- File Handling

Select soft key

File Menu:

- Save As

How to get there:

Press the Main soft key in any test card

Main Menu:

- File Handling

Select soft key

File Menu:

- Copy File(s) or

- Cut File(s)

How to get there:

Saving a file

1. Open the file menu and select Save As.

2. Navigate to the desired folder in the file system where you want to save the

Note: The test results and settings of each test finished with the "Test ok" status are automatically stored to the file OMICRON\AutoSave\CTAnalyzer.xml on the Compact Flash card. The existing CTAnalyzer.xml file is overwritten with each successful test. Tests that could not be finished successfully or that were aborted by the user are not stored and thus do not overwrite the existing CTAnalyzer.xml file.

Note: You can also save a file by pressing the Save or the Save As soft key in the CT-Object card.

file:

• If you like to save the file with the same name, press the Save soft key. A warning will pop up asking whether the existing file should be overwritten or not.

• If you want to use a similar file name as an existing one in the selected folder, select this file using the cursor keys and press the Save As soft key or the key. A new *.xml file entry with the selected file name is added. Edit this file name and then press again Save, Save As or the key.

Copying / cutting and pasting a file on the Compact Flash card

Note: Copying / cutting and pasting folders is not possible with the CT Analyzer.

1. Open the file menu and select Copy File(s) or Cut File(s).

2. The file system card appears. Navigate to the desired file you want to copy or cut.

3. Highlight the file and then press the Copy (or Cut) soft key.

To go back to the main menu without copying or cutting a file, press Abort.

Note: To select several neighboring files at a time, keep the key pressed while selecting the files using the cursor keys.

4. The file system card is closed and the file menu is displayed. Select Paste File(s).

5. The file system card appears again. Navigate to the desired location in the file system where you want to paste the file.

6. Press the Paste soft key to paste the file.

In case of a cut/paste action, the file is not deleted from its old location until it has been pasted at its new location.

Operating and Configuring the CT Analyzer

Press the Main soft key in any test card

Main Menu:

- Settings

Select soft key

-> Setting Menu page

How to get there:

5.7 Settings

In the Setting Menu page you can access the device settings or the default settings for a new CT test. Select an entry using the cursor keys and then press the Select soft key to open the corresponding settings page.

Figure 5-9 Setting Menu page

5.7.1 Available Options in the Settings Menu

Select Language Selection of the user interface language.

One user language can be installed on the CT Analyzer. The English user interface is part of the firmware and therefore always available. The second language can be installed by the user as required (refer to section 5.8 on page 73).

Select Startup Mode

Default Test Card Selection

Using this option you can select the default test mode the CT Analyzer comes up each time when it is switched on. Select the mode using the soft keys:

Single Tap: The CT Analyzer automatically initializes a normal single-ratio CT test.

Multi-Ratio: The CT Analyzer automatically initializes a multi-ratio CT test using the CT SB2 switch box (see the CT SB2 User Manual for more detailed information).

Quick: The CT Analyzer automatically initializes the Quick Test measurement function (see chapter 8 on

page 135 for more detailed information).

Select the test cards a new CT test should contain by default. Please refer to section 5.7.2 on page 69.

CT Analyzer User Manual

Default Standard Select the default I

setting to be used for a new CT test using the soft keys.

"Isn": Select the default secondary current (1A or 5A, or ? if you want to use the guesser function by default).

Standard": Select IEC 61869-2, IEC 60044-1,

IEC 60044-6 or IEEE C57.13.

P/M": Select Prot. CT or Meter. CT (protection or metering CT), or ? if you want to use the guesser function by default.

Class": The classes available for selection depend on the selected standard and CT type (P/M). Select a class or ? if you want to use the guesser function by default.

"Ktd" (IEC 60044-6 only): If IEC 60044-6 is selected for the standard, it is furthermore possible to select the calculation method for the K

(transient dimensioning factor):

acc. to IEC 60044-6: K to the standard.

acc. to OMICRON: K remanence.

acc. to GB 16847: K standard GB16847.

"TPX/Y/Z Spec. Mtd." For IEC 61869-2 protection CTs of the classes TPX, TPY and TPY it is possible to select the default method for specifying the protection requirements used for the accuracy class assessment (refer to page 93 for more information).

by Duty: Protection requirements specification by duty cycle and the necessary time constants (standard specification according to IEC 61869-2; the CT Analyzer then calculates the K

values).

by Ktd: Protection requirements specification by the rated transient dimensioning factor K

CT’s name plate (alternative specification according to IEC 61869-2).

Default Nominal Frequency

Nominal frequency to be used for a new CT test:

16.7Hz, 50Hz, 60Hz or 400 Hz.

, standard, class and CT type (P/M)

is calculated exactly according

calculation considers the CT

is calculated acc. to the Chinese

(IEC 61869-2 protection CTs only):

automatically from the entered

stated on the

Operating and Configuring the CT Analyzer

Temperature Select the temperature unit (°C or °F) and the default

values for the ambient temperature and the reference temperature (for winding resistance measurement and calculation).

Date/Time Clock settings for the device-internal clock.

Display Contrast Display contrast adjustment.

Accur. Limiting Error Graph

Enable or disable the accuracy limiting error graph.

This graph is primarily required for Chinese standards. It shows the maximum possible primary current (K * I

) that can flow over a specific burden without exceeding the accuracy limit (5% or 10 %).

Start Delay Allows the definition of a delay time of up to 10s for the

actual test start after pressing the start button.

You can apply the defined delay for the burden test, the residual magnetism measurememt, the primary winding resistance measurement and the secondary winding resistance measurement.

Min. VA at M cores Isn 5A

Applies to IEC 60044-1 metering CTs with I

= 5A only!

Here you can set the minimum VA value used for the CT assessment to 3.75VA. This means, selecting the

3.75VA soft key will cause the CT Analyzer to assess the CT only up to a lower nominal burden limit of 3.75VA instead of 1VA. When 3.75VA is active, it is not possible to enter VA values lower than 3.75VA in the CT-Object card.

Selecting 0VA deactivates this option. Assessment is then performed up to a lower burden value of 1VA. This is the factory default which is suitable for most cases. You should not change it without important reason.

C57.13 electronic burdens

Applies to IEEE C57.13 metering CTs only!

Enable or disable the use of the electronic burdens E-0.2 and/or E-0.04 for CT Assessment. If enabled, these values are offered in the set of soft keys available for the "VA" and "Burden" parameters in the CT-Object card. In this case, CT assessment is also performed for the electronic burden values in addition to the burden values defined in the standard.

CT Analyzer User Manual

Remote interface

Misc. Settings Use the Miscellaneous Settings page to

If your CT Analyzer is equipped with a USB interface and a RS232 interface, use this option to display the Select remote interface port page. On this page you can select the interface used to connect the CT Analyzer to a PC: USB or RS232.

If equipped with both interfaces, the CT Analyzer will only communicate via the selected interface. It will not be recognized by the computer if the CT Analyzer settings do not match the interface used for connection.

• enable or disable automatic test assessment if a parameter marked with a star "*" in the CT-Object card was not entered by the user prior to the test. Parameters marked with a star are mandatory parameters that are required for assessment (and possibly for the calculation of further parameters).

• enable or disable continuous burden measurement.

• define the class multiplication factor.

• define the thresholds for the decision algorithms of the guesser function.

Please refer to section 5.7.3 on page 70 for more information.

1. Only available for CT Analyzer devices that are equipped with a USB interface (serial number JHxxxx or newer).

5.7.2 Default Test Card Selection

Press the Main soft key in any test card

Main Menu:

- Settings

Select soft key

Setting Menu:

- Default Test Card Selection

Select soft key

-> Select Cards page

How to get there:

Enabling or disabling test cards for the default test is done using the Default Test Card Selection option from the Setting Menu. In this case, the test card selection made in this page becomes effective when starting a new CT test.

If you want to enable or disable test cards for your currently active test only, press the Select Cards soft key in the CT-Object card. In this case, the test card selection made in this page is immediately effective after pressing the Back soft key.

To enable or disable a test card, select its entry using the cursor keys and then press the Add or Remove soft key. Enabled cards are marked with a checkmark, see Figure 5-10.

Figure 5-10 Select Cards page for selecting the default test cards

Operating and Configuring the CT Analyzer

Some cards require the existence of other cards. This means that if you are adding such a card, the required other cards are automatically added, too. On the other hand, if you remove a card which is required by another card, the other card is removed, too. Figure 5-11 shows these dependencies.

CT Analyzer User Manual

CT-Object

Sec. Winding Resistance

Excitation

Ratio

Burden

Assessment

Comment

requires

Prim. Winding Resistance

requires

Residual Magnetism

requires

ESC

Press the Main soft key in any test card

Main Menu:

- Settings

Select soft key

Setting Menu:

- Misc. Settings

Select soft key

-> Miscellaneous Settings page

How to get there:

Figure 5-11 Dependencies of test cards

5.7.3 Miscellaneous Settings

To save your selection and return to the setting menu press the Back soft key. To return to the setting menu without saving the selection, press the key.

Figure 5-12 Miscellaneous Settings page

Operating and Configuring the CT Analyzer

I/0

The following values can be defined in the Miscellaneous Settings page.

Assessments

Check "*" settings before start

Display warning before start

Continuous burden measurement

Depending on the selected standard and CT type, some parameters and data (for example, the nominal burden) are required to obtain a correct assessment of the CT. If the user does not specify these data prior to the test, the automatic assessment function of the CT Analyzer possibly performs the assessment based on the actual values determined for the CT during the test and not based on the CT’s nominal data stated on the name plate.

"Check "*" settings before start"

If this option is enabled, the CT Analyzer checks whether the user has entered all necessary values and data relevant for an automatic assessment prior to the test start. The respective parameters are then marked by a star ("*") in the CT-Object card. If the user did not enter data for one or more of these mandatory parameters, no automatic assessment is performed and the CT Analyzer displays an "Assessment not available" message after the test is finished.

This option can be used to avoid an automatic assessment if the user did not enter all required parameters and CT data prior to the test.

"Display warning before start"

This option is only relevant if the "Check "*" settings before start" option is enabled. It is enabled automatically when enabling the "Check "*" settings before start" option but can be disabled manually.

Enabling the "Display warning before start" option displays a corresponding warning message prior to the test start if the user did not enter data for one or more of the mandatory parameters that are required for assessment.

Normally, the CT Analyzer stops the burden test automatically as soon as it obtains stable measurement values for the connected burden.

If this option is enabled, the burden measurement is not stopped automatically but instead performed continuously until the user stops it manually by pressing the key.

CT Analyzer User Manual

Class multiplication factor

Decision 1A/5A CT If the guesser function is active, the device uses the

Decision P/M CT If the guesser function is active, the device uses the

The default value for the class multiplying factor can be set. This default is used when the CT Analyzer is switched on or if a new CT test is selected in the main menu.

The class multiplying factor increases the assessment level for the ratio test. For example, a class multiplier of 0.5 means that the maximum accepted tolerance for the ratio error is only half the standard tolerance.

Possible values: 0.25 to 1.00. Default: 1.00

measured winding resistance to decide whether the CT is a 1A or 5A CT. This value specifies the decision threshold.

Possible values: 0.5 to 2

If the measured winding resistance is higher than the defined value, the guesser function decides that the CT’s nominal secondary current is 1A. Otherwise the secondary current is 5A.

measured knee point voltage to decide whether the measured CT is a protection CT or a metering CT. This value specifies the decision threshold.

If the knee point voltage is higher than the defined value, the guesser function decides that the measured CT is a protection CT. Otherwise it is a metering CT.

• "1A: Prot. CT, if V-kn >" Possible values: 50 to 300V. Default: 100 V.

• "5A: Prot. CT, if V-kn >" Possible values: 15 to 60V. Default: 20V.

Ω. Default: 1Ω.

The Reset Values soft key resets all values to their default values.

5.8 Tools (Update Functions)

Press the Main soft key in any test card

Main Menu:

- Tools

Select soft key

-> Tools Menu page

How to get there:

From the Tools Menu page you can access the update functions of the CT Analyzer.

Figure 5-13 Tools Menu page

5.8.1 Available Functions

Update Text Using this item you can install a new user interface

language file.

The file system page opened after selecting

Update Text only displays files named CTUser_*.bin.

Operating and Configuring the CT Analyzer

Please refer to section 5.8.2 on page 74.

Update Firmware Using this item you can update the firmware of your

CT Analyzer.

The file system page opened after selecting

Update Firmware only displays files named CTAnalyzer.bin.

Please refer to section 5.8.3 on page 75.

CT Analyzer User Manual

Press the Main soft key in any test card

Main Menu:

- Tools

Select soft key

Tools Menu:

- Update Text

-> File system card

How to get there:

Update Licenses This function allows to add additional licenses to your

CT Analyzer.

Using the Update License soft key you can read a license file from the Compact Flash card.

Using the New License soft key you can add new licenses manually.

For information on how to receive new licenses or a new license key for additional functions, please contact your local OMICRON distributor or the OMICRON support.

5.8.2 Update Text

Note: Instead of using the Update Text function of the CT Analyzer you can also use the Firmware Update PC tool contained in the CT Analyzer PC Toolset. For detailed information, please refer to the help system of the CT Analyzer PC Toolset.

Using this function you can install a new user interface language file. The new language installed is then available for selection in the Language page.

Figure 5-14 File system card for selecting a new language file

To install a new language, select the corresponding file CTUser_xxx.bin in the directory A:\OMICRON\ on the Compact Flash card using the cursor keys and press the Select soft key.

English is contained in the firmware and does not require a user language file.

Press the Main soft key in any test card

Main Menu:

- Tools

Select soft key

Tools Menu:

- Update Firmware

-> File system card

How to get there:

Caution: Only install language files that are included in the package of the installed firmware version. If you install a language file that does not belong to the same package, the user interface may become unreadable.

Refer to the OMICRON website for available languages or ask your distributor for a special language file.

If the text update process is interrupted or fails, the device displays an error message and automatically resets the user interface to English when it is switched on the next time.

Press Abort to return to the tools menu without installing a new language.

5.8.3 Update Firmware

Note: Instead of using the Update Firmware function of the CT Analyzer you

can also use the Firmware Update PC tool contained in the CT Analyzer PC Toolset. For detailed information, please refer to the help system of the CT Analyzer PC Toolset.

Operating and Configuring the CT Analyzer

Using this function you can install new device firmware.

Figure 5-15 File system card for selecting a new firmware file

To perform a firmware update, a corresponding firmware file CTAnalyzer.bin has to be available in the directory A:\OMICRON\ on the Compact Flash card.

To update the firmware, select the desired firmware file CTAnalyzer.bin using the cursor keys and press the Update Firmw. soft key.

Note: The firmware update process may take some minutes. If the update process is interrupted or fails, switch the CT Analyzer off and on again. The device then tries to perform the firmware update again automatically.

CT Analyzer User Manual

It is also possible to install older firmware. In this case, the user interface text is deleted and the device automatically changes to the English user interface. After you have downgraded the firmware, you also have to install the user interface language file of this (older) firmware package.

After the installation of new firmware, the user interface language automatically changes to English if the installed user interface text is no longer compatible. If you are using a user interface language other than English, install the corresponding new user interface language file delivered with the new firmware.

Press Abort to return to the Tools Menu page without updating the firmware.

5.9 CT Analyzer Help System

The CT Analyzer provides a context-sensitive help system. Pressing the key displays a help page, the content of which depends on where the focus was set before the key was pressed.

For example:

• If the focus is set to the CT-Object card’s tab, pressing the the key displays a help page showing the wiring for a CT test.

• If the focus is set to the Burden card’s tab, pressing the the key displays a help page showing the wiring for a burden test.

• If a parameter field in the CT-Object card or the Assessment card is selected with the cursor, pressing the the key displays a help page with explanatory texts for this specific parameter.

Figure 5-16 Help system showing the wiring diagram for a CT test (left) and

explanatory text for a parameter (right)

When the help system is displayed, you can use the Next Page and Prev. Page soft keys to scroll through the available help pages. Pressing the About soft key opens a page with information about the CT Analyzer hardware, the installed firmware version, the serial number, etc.

Operating and Configuring the CT Analyzer

5.10 Operating the CT Analyzer from a Computer

It is also possible to operate the CT Analyzer remote controlled from a computer. Diverse software tools are available from OMICRON for this purpose.

For a detailed description, please refer to the help system of the CT Analyzer PC Toolset.

CT Analyzer User Manual

6 The CT Analyzer Test Cards

6.1 Overview of Test Cards

The following table provides an overview of all test cards available for the

CT Analyzer. The set of test cards actually available on your CT Analyzer depends on your purchased license(s).

Note: For up-to-date information about available licenses for the CT Analyzer

please refer to the OMICRON website or contact your OMICRON sales contact.

Card Short description

CT-Object This card contains the basic CT data and is always

required to perform a CT test. Refer to page 80.

Burden This card is used to measure a current transformer’s

secondary burden with AC current. Refer to page 100.

Res. Magnetism This card is used to measure the residual magnetism of

CTs. Refer to page 102.

Resistance This card is used to measure the secondary winding

resistance and the primary winding resistance of the CT. Refer to page 105.

Excitation This card is used to trace the excitation curve of the

current transformer and to determine further CT-specific parameters. Refer to page 108.

Ratio This card is used to measure the current ratio of the CT

considering the external load or the nominal burden and to determine the current ratio error and the phase displacement. Refer to page 119.

Assessment This card shows the automatic assessment of the tested

parameters according to the selected standard. In this card you can also perform a manual assessment. Refer to page 125.

Comment In this card you can enter any text, e.g. additional notes

regarding the test. Refer to page 130.

The CT Analyzer Test Cards

CT Analyzer User Manual

ESC

6.2 CT-Object Card

The CT-Object card is the most important card and always required for all types of tests. In this card all necessary settings for a test are done. Some of the settings contained in the CT-Object card are also shown in other cards for information.

Note: The CT-Object card is the top user interface level. Pressing the key several times will always bring you back to the CT-Object card.

Figure 6-1 CT-Object card with default settings after initializing a new CT

test

6.2.1 Available Soft Keys

Clears the results of the previous test and enables to start a new test. All measurement results as well as all the parameters previously determined using the "guesser function" are cleared. Text entries for "Location" and "Object" remain unchanged.

Saves the test results and test settings to the currently loaded CT Analyzer report file. If the test results have not been saved yet, the Save As dialog is opened. Saving a file is described on page 64.

Saves the test results and test settings to a new .xml file. Saving a file is described on page 64.

Allows to load a test stored on the Compact Flash card in order to check its results, to recalculate the results with different settings or to use its settings for a new test.

Note: Recalculation of the existing CT test results in order to verify the behavior of the CT at different burdens or primary currents can be performed by changing the burden value on the CT-Object card or the primary current on the Ratio card. The recalculated results can then be stored again like for a regular test.

The CT Analyzer Test Cards

Opens the Select Cards page where you can select the test cards for the current test. The Select Cards page is described on page 69.

Note: When loading a new CT test from the main menu (using the "New CT-Test" entry), the test card selection defined in the default test settings is used for this new test. The card selection performed in the CT-Object card will then be discarded.

6.2.2 Information Fields to be Filled by the User

Figure 6-2 Editing the location settings in the CT-Object card

The "Location" and "Object" text fields are only used for reporting and documentation purposes. They can be filled by the user after the test is finished. These fields provide information about the location of the CT and the CT itself. The content of these fields is defined in the Location settings page and the Object settings page, respectively.

To open these settings pages, position the cursor on the "Location" or the "Object" field and then press the Details soft key or the key.

Location settings

page

Object settings

page

The Location settings page provides the following text fields. Each field can contain a maximum of 40 numbers or letters.

• Company, Country, Station, Feeder: Information where the CT is installed.

• Phase: Phase to which the CT is connected.

• IEC-ID: IEC-ID of the CT or freely definable information.

The Object settings page provides the following text fields. Each field can contain a maximum of 40 numbers or letters.

• Manufact.: Manufacturer of the CT under test.

• Type: Type number or description of the CT under test.

• Serial No.: Serial number of the CT under test.

• Core: Number of the tested core.

• Tap: Description of the tap (e.g. 1S1-1S3, X1-X4, ...).

• Optional 1: Optional field for free use.

CT Analyzer User Manual

6.2.3 Parameters and Settings Used or Determined by the Test Process

The fields described in this section are used and/or determined by the test process.

Figure 6-3 Editing the CT-Object card

Note: If the "Check "*" settings before start" option is enabled in the default test settings (see section 5.7.3 ”Miscellaneous Settings” on page 70), no automatic assessment will be available if you do not enter data for a parameter that is relevant for assessment. Such parameters are marked by a star "*" in the CT Analyzer user interface and in the following tables.

The CT Analyzer Test Cards

Common Parameters and settings displayed for all standards, CT types and classes

The table below lists all parameters and settings that are displayed for all standards, CT types and classes.

In addition to these common parameters, specific additional parameters are displayed in the CT-Object card depending on the selected standard, CT type (protection or metering CT) and class. For these specific parameters, please refer to the tables on pages 87 to 99.

Parameter Description

I-pn Rated primary current.

Possible values: 1 to 99000A or ?

I-sn Rated secondary current.

Possible values: 0.0001 to 25A or soft keys 1.0, 2.0, 5.0, 1.0A/ √3, 2.0A / √3,

5.0A/ √3 or ?

Default: ?.

Standard Standard according to which the test has to be performed.

Possible values: Soft keys IEC 60044-1, IEC 60044-6, IEEE C57.13 or

IEC 61869-2

Default: Standard defined in the default test settings.

Note: Using the IEEE C57.13 standard for transformers with gapped cores may possibly deliver incorrect results.

P/M * Definition of CT type: Protection or metering CT.

Possible values: Soft keys Prot. CT, Meter. CT or ?

Default: As defined in the default test settings.

* This parameter is relevant for assessment. No automatic assessment is available if the user did not enter data for this parameter prior to the test (see page 82).

soft key. Default: ?.

CT Analyzer User Manual

Parameter Description

Class * Accuracy class of the CT.

Possible values: Depending on the selected standard or ?

Default: As defined in the default test settings.

This parameter is only displayed, after the parameters "Standard" and "P/M" have been defined or determined by the CT Analyzer. Depending on these parameters, the parameters for the CT class can be selected using the soft keys.

Note: The class can be selected by soft keys or is determined by the CT Analyzer during the test. Automatic determination during the test only works for IEC 61869-2 or IEC 60044-1 metering CTs and IEEE C57.13 metering CTs. If the question mark has been entered for the "P/M" parameter, the "Class" cannot be defined by the user but is automatically determined by the CT Analyzer instead.

* This parameter is relevant for assessment. No automatic assessment is available if the user did not enter data for this parameter prior to the test (see page 82).

For IEEE C57.13 metering CTs only: An additional soft key Assess @ VA is available for metering CTs according to IEEE C57.13. Use this option if the accuracy class of the CT only applies to one specific burden.

CT assessment is normally performed for the maximum burden specified ("VA" or "Burden" parameter) and all lower burdens defined in the standard. Example: If the burden specified is B-0.9, the assessment is performed for the burdens B-0.9, B-0.5, B-0.2 and B-0.1 (and the electronic burdens E-0.2 and E-0.04).

Selecting the Assess @ VA option in addition to the class setting will cause the CT Analyzer to consider only the burden value specified prior to testing for the CT assessment. The ratio table and the phase table in the Ratio card then only show the error for this specific burden (see section 6.7.5 on page

123).

When Assess @ VA is selected, the soft key changes to Assess all VA to enable deactivation of this option.

Parameter Description

rated

-------------





VA *

Cos

Burden

Cos

f Rated frequency of the CT.

Nominal burden of the CT, used to calculate the behavior of the CT at the nominal burden.

Possible values: 0 to 300VA or soft keys 1.0VA to 30VA or ?

Depending on the burden and the selected test standard, the corresponding cos ϕ is used (cos ϕ not editable by the user).

* This parameter is relevant for assessment. No automatic assessment is available if the user did not enter data for this parameter prior to the test (see page 82).

If the IEEE C57.13 standard is selected with the type "metering CT" CT Analyzer offers some soft keys (e.g. B-0.1, B-0.2, B-0.5 etc.) with standard loads for the power. If these soft keys are used, the power is calculated according to table 9 of IEEE C57.13. If the rated current is not 5A, the resistance and inductance of the table is multiplied by the factor

If the IEEE C57.13 standard is selected with the type "protection CT" (class C, K or T), the VA and Cos ϕ parameters are not accessible to the user. In this case, the user has to enter the terminal voltage V parameters and settings displayed for IEEE C57.13 protection CTs" on page 98.

"Burden" and "Cos ϕ" are used to define the operating burden connected to the CT. These parameters are used to calculate the behavior of the CT at the operating burden (connected burden) and the corresponding cos

Possible values for "Burden": 0 to 300VA or soft keys 1.0VA to 30VA or ?

Possible values for "Cos

These parameters can also be changed after the test or in a loaded test report in order to check the CT behavior at different burden values.

Special behavior depending on available test cards: If the test contains a Burden card, a question mark is automatically entered to the fields "Burden" and "cos ϕ" and entering the burden is not possible until the test is finished. In this case, the value determined during the burden test is automatically entered after burden measurement. If I

burden is updated immediately after the burden test is finished. If I defined (entry "?"), the burden is updated after the resistance test.

Possible values: Integer value between 16 and 400 Hz or soft keys 16.7Hz, 50Hz, 60 Hz or 400 Hz.

Default: Frequency defined in the default test settings.

ϕ": 0 to 1.

The CT Analyzer Test Cards

, the

instead. See "Specific

ϕ.

is defined, the

is not

CT Analyzer User Manual

Parameter Description

Rprim Specified primary winding resistance (only available if primary winding

Class mult. factor

Delta compensation

resistance measurement is enabled for the test).

Possible values: 0 to 3000 ohms or soft key ?

Default: ?.

Class multiplying factor.

This factor increases the assessment level for the ratio test. E.g. a class multiplier of 0.5 means that the maximum accepted tolerance for the ratio error is only half the standard tolerance.

Possible values: 0.25 to 1.00 or soft key 1.0.

Default: 1.0 (as set in the device settings: Main Menu, entry "Settings" -> Setting Menu, entry "Misc. Settings").

Correction factor for the ratio measurement. This factor enables the ratio measurement for CTs that are installed inside a delta winding transformer.

Possible values: Soft keys Ratio 1, Ratio 2/3 or Ratio 1/3.

Default: Ratio 1.

Choose "Ratio 1" if no correction is required.

Choose "Ratio 2/3" if input PRIM is connected to the two terminals of that transformer winding, the CT is in series with.

Choose "Ratio 1/3" if input PRIM is connected to the terminals of a transformer winding, the CT is not in series with.

1. If the question mark is entered for this parameter and a new test is started, the CT Analyzer automatically tries to determine the value using its integrated guesser function (see chapter 7 on page 131).

The CT Analyzer Test Cards

Specific parameters and settings displayed for IEC 60044-1 protection CTs

The following parameters are only displayed in the CT-Object card if the standard IEC 60044-1 is selected with the type "Protection CT".

Param. Description Available for IEC 60044-1

protection CTs, class

2P, 3P, 4P, 5P,

6P, 10P

ALF Accuracy limiting factor acc. to IEC 60044-1.

Possible values: Integer value from 1 to 300 or soft keys

, 5, 10, 15, 20 or 30.

Default: ?.

Rct Specified secondary winding resistance.

Possible values: 0 to 3000 ohms or soft key ?

Default: ?

Ts Specified secondary time constant.

Possible values: 0.000 to 100.0s or soft key ?

Default: 100s.

Kx Dimensioning factor acc. to IEC 60044-1, PX.

Possible values: 1 to 300 or soft key ?

Default: ?.

Ek Rated knee point e.m.f.

Possible values: 0 to 20000 or soft key ?

Default: ?.

Ie Accuracy limiting current acc. to IEC 60044-1, PX.

Possible values: 0.03mA to 30 A or soft key ?

Default: ?.

E1 User-defined e.m.f. to verify the excitation current at this

specific e.m.f.

Possible values: 0.1 to 20000V or soft key ?

Default: ?.

Ie1 Maximum allowed excitation current at E

Possible values: 0.03mA to 30000 mA or soft key ?

Default: ?.

2. If the question mark is entered, half the voltage entered or measured for Ek is used.

3. If the question mark is entered, the CT Analyzer uses the excitation current measured at the voltage value defined at E

. In this case, the assessment for this parameter is OK.

2PR, 3PR, 4PR, 5PR,

6PR, 10PR

CT Analyzer User Manual

Specific parameters and settings displayed for IEC 60044-1 metering CTs

The following parameters are only displayed in the CT-Object card if the standard IEC 60044-1 is selected with the type "Metering CT".

Param. Description Available for

FS Instrument security factor acc. to IEC 60044-1.

ext. Ipn Extended current rating.

1. If the question mark is entered for this parameter and a new test is started, the CT Analyzer

IEC 60044-1

metering CTs,

class

0.1, 0.2, 0.2s, 0.5,

0.5s, 1, 3, 5

Possible values: Integer value from 1 to 30 or soft keys ? FS1.5, FS2, FS5, FS10, FS20 or FS30.

Default: ?.

Possible values: 100 to 400% or soft keys 120%, 150%, 200%, 300%, 400%.

Default: 120 %.

automatically tries to determine the value using its integrated guesser function (see chapter 7 on page 131).

, FS1,

The CT Analyzer Test Cards

K1–

------------ -=

Specific parameters and settings displayed for IEC 60044-6

The following parameters are only displayed in the CT-Object card if the standard IEC 60044-6 is selected.

Param. Description Available for

IEC 60044-6, class

TPS TPX TPY TPZ

Rct Specified secondary winding resistance.

Possible values: 0 to 3000 ohms or soft key ?

Default: ?

Kssc Rated symmetrical short-circuit current factor.

Possible values: 1 to 300 or soft keys ?

, 3, 5, 7.5, 10,

12.5, 15, 17.5, 20, 25, 30, 40 or 50.

Default: ?.

Tp Primary time constant.

Possible values: 0.000 to 5.000s or soft keys 20ms, 40ms, 60ms, 80ms, 100ms or 120ms.

depends on K as follows:

xxxx

K Dimensioning factor.

Possible values: 1 to 1572.

K depends on T

as described above for Tp.

V-al Rated equivalent excitation limiting secondary voltage.

Possible values: 0 to 9999V or soft key ?

Default: ?.

I-al Accuracy limiting secondary excitation current.

Possible values: 0.03mA to 30 A or soft key ?

Default: ?.

E1 User-defined e.m.f. to verify the excitation current at this

specific e.m.f.

Possible values: 0.1 to 20000V or soft key ?

Ie1 Maximum allowed excitation current at E

(user-defined

e.m.f.).

Possible values: 0.03mA to 30 A or soft key ?

Ktd Rated transient dimensioning factor.

Possible values: 1.0 to 2043 or soft key ?

Default: ?.

xxx

CT Analyzer User Manual

Param. Description Available for

Ts Specified secondary time constant.

Duty Specified duty cycle.

t1 Duration of first current flow. The specified accuracy limit

t-al1 Permissible time to accuracy limit for first energizing

t2 Duration of second current flow. The specified accuracy

t-al2 Permissible time to accuracy limit for second energizing

tfr Dead time between first opening and reclosure.

Possible values: 0.000 to 100.0s or soft key ?

Default: ?.

Using the soft keys, two different energizing cycles can be selected: C-O or C-O-C-O

Default: C-O.

must not be reached within time t

al1

Possible values: 0.000 to 5.000s or soft key 100ms.

Default: 0.1s.

period of the duty cycle.

Possible values: 0.000 to 5.000s and max. t

or soft key

40ms.

Default: 0.04s.

limit must not be reached within time t

al2

Note: Only displayed if "Duty" is C-O-C-O.

Possible values: 0.000 to 5.000s or soft key 100ms.

Default: 0.1s.

period of the duty cycle.

Note: Only displayed if "Duty" is C-O-C-O.

Possible values: 0.000 to 5.000s and max. t

or soft key

40ms.

Default: 0.04s.

Note: Only displayed if "Duty" is C-O-C-O.

Possible values: 0.00 to 5.00s or soft key 300ms.

Default: 0.3s.

IEC 60044-6, class

TPS TPX TPY TPZ

The CT Analyzer Test Cards

Param. Description Available for

IEC 60044-6, class

TPS TPX TPY TPZ

Ktd calculation

1. If the question mark is entered for this parameter and a new test is started, the CT Analyzer

2. If the question mark is entered, half the voltage entered or measured for E

3. If the question mark is entered, the CT Analyzer uses the excitation current measured at the

Calculation method for transient dimensioning factor Ktd.

Select a calculation method using the soft keys: acc. to IEC 60044-1 (calculation exactly acc. to standard), acc. to OMICRON (calculation considers CT remanence) or acc. to GB 16847 (acc. to Chinese

standard GB 16847).

Default: As defined in the default test settings (see "Default Standard" parameter in section 5.7.1 on page 65).

automatically tries to determine the value using its integrated guesser function (see chapter 7 on page 131).

voltage value defined at E

. In this case, the assessment for this parameter is OK.

is used.

CT Analyzer User Manual

Specific parameters and settings displayed for IEC 61869-2 protection CTs

The following parameters are only displayed in the CT-Object card if the standard IEC 61869-2 is selected with the type "Protection CT".

Param. Description Available for IEC 61869-2

ALF Accuracy limiting factor acc. to IEC 61869-2.

Rct Specified secondary winding resistance.

Ts Specified secondary time constant.

Kx Dimensioning factor acc. to IEC 61869-2.

Ek Rated knee point e.m.f.

E1 User-defined e.m.f. to verify the excitation

Ie Accuracy limiting current acc. to IEC 61869-2.

Ie1 Maximum allowed excitation current at E

Possible values: Integer value from 1 to 300

or soft keys ?

, 5, 10, 15, 20 or 30.

Default: ?.

Possible values: 0 to 3000 ohms or soft key

Default: ?

Possible values: 0.000 to 100.0s or soft key

Default: 100 s.

Possible values: 1 to 300 or soft key ?

Default: ?.

Possible values: 0 to 20000 or soft key ?

Default: ?.

current at this specific e.m.f.

Possible values: 0.1 to 20000V or soft key ?

Default: ?.

Possible values: 0.03mA to 30 A or soft key

Default: ?.

Possible values: 0.03mA to 30000 mA or soft

key ?

Default: ?.

protection CTs, class

protection transient

xP xPR PX PXR TPX TPY TPZ

protection

xxx x x x

xxxx

The CT Analyzer Test Cards

Param. Description Available for IEC 61869-2

protection CTs, class

Kssc Rated symmetrical short-circuit current factor.

Possible values: 1 to 300 or soft keys ?

, 3, 5,

7.5, 10, 12.5, 15, 17.5, 20, 25, 30, 40 or 50.

Default: ?.

Spec. The accuracy class assessment has to be

performed for the specific protection requirements the CT is built for. According to the standard, these requirements are normally stated by the duty cycle and the time constants.

However, in some cases the choice of one specific duty cycle/time constant cannot describe all protection requirements. Therefore, the CT Analyzer offers the possibility to specify "more general requirements" (which cover the requirements of different duty cycles and time constants) by entering the K

instead.

Use the soft keys to choose if you want to specify the protection requirements used for the accuracy class assessment

• by specifying the duty cycle and the necessary time constants (by Duty, standard specification according to IEC 61869-2; the CT Analyzer then calculates the K

automatically from the

entered values)

• or alternatively by specifying the rated transient dimensioning factor K

stated on

the CT’s name plate (by Ktd, alternative specification according to IEC 61869-2).

The setting of this parameter displays or hides the parameters K

, and Tp, Duty and t

al1

(see

parameter descriptions below).

Possible values: Soft keys by Duty or by Ktd.

Default: As defined in the default test settings.

protection transient

xP xPR PX PXR TPX TPY TPZ

protection

xxx

CT Analyzer User Manual

K1–

------------ -=

Param. Description Available for IEC 61869-2

Ktd * Rated transient dimensioning factor according

Tp * Primary time constant.

Duty Specified duty cycle.

to the name plate.

Note: Only displayed if parameter "Spec." is "by Ktd".

Possible values: 1.0 to 2043 or soft key ?

Default: ? or ?*.

* If displayed, this parameter is relevant for assessment. No automatic assessment is available if the user did not enter data for this parameter prior to the test (see page 82).

Note: Only displayed if parameter "Spec." is "by Duty".

Possible values: 0.000 to 5.000s or soft keys 20ms, 40ms, 60ms, 80ms, 100ms or 120ms.

depends on K as follows:

Default: ? or ?*.

* If displayed, this parameter is relevant for assessment. No automatic assessment is available if the user did not enter data for this parameter prior to the test (see page 82).

Note: Only displayed if parameter "Spec." is "by Duty".

Using the soft keys, two different energizing cycles can be selected: C-O or CO-CO

Default: C-O.

protection CTs, class

protection transient

protection

xP xPR PX PXR TPX TPY TPZ

xxx

The CT Analyzer Test Cards

Param. Description Available for IEC 61869-2

protection CTs, class

t-al1 * Permissible time to accuracy limit for first

energizing period of the duty cycle.

Note: Only displayed if parameter "Spec." is "by Duty".

Possible values: 0.000 to 5.000s and max. t or soft key 40ms.

Default: ? or ?*.

* If displayed, this parameter is relevant for assessment. No automatic assessment is available if the user did not enter data for this parameter prior to the test (see page 82).

t1 * Duration of first current flow. The specified

accuracy limit must not be reached within time t

al1

Note: Only displayed if parameter "Spec." is "by Duty" and "Duty" is "CO-CO".

Possible values: 0.000 to 5.000s or soft key 100ms.

Default: ? or ?*.

* If displayed, this parameter is relevant for assessment. No automatic assessment is available if the user did not enter data for this parameter prior to the test (see page 82).

tfr * Dead time between first opening and

reclosure.

Note: Only displayed if parameter "Spec." is "by Duty" and "Duty" is "CO-CO".

Possible values: 0.00 to 5.00s or soft key 300ms.

Default: ? or ?*.

* If displayed, this parameter is relevant for assessment. No automatic assessment is available if the user did not enter data for this parameter prior to the test (see page 82).

protection transient

xP xPR PX PXR TPX TPY TPZ

protection

xxx

CT Analyzer User Manual

Param. Description Available for IEC 61869-2

t-al2 * Permissible time to accuracy limit for second

1. If the question mark is entered for this parameter and a new test is started, the CT Analyzer

2. If the question mark is entered, half the voltage entered or measured for E

3. If the question mark is entered, the CT Analyzer uses the excitation current measured at the

protection CTs, class

protection transient

xP xPR PX PXR TPX TPY TPZ

protection

energizing period of the duty cycle.

Note: Only displayed if parameter "Spec." is "by Duty" and "Duty" is "CO-CO".

Possible values: 0.000 to 5.000s or soft key 40ms.

xxx

Default: ? or ?*.

* If displayed, this parameter is relevant for assessment. No automatic assessment is available if the user did not enter data for this parameter prior to the test (see page 82).

automatically tries to determine the value using its integrated guesser function (see chapter 7 on page 131).

voltage value defined at E

. In this case, the assessment for this parameter is OK.

is used.

The CT Analyzer Test Cards

Specific parameters and settings displayed for IEC 61869-2 metering CTs

The following parameters are only displayed in the CT-Object card if the standard IEC 61869-2 is selected with the type "Metering CT".

Param. Description Available for

IEC 61869-2

metering CTs,

class

0.1, 0.2, 0.2s, 0.5,

0.5s, 1, 3, 5

FS Instrument security factor acc. to IEC 61869-2.

Possible values: Integer value from 1 to 30 or soft keys ? FS1.5, FS2, FS5, FS10, FS20 or FS30.

Default: ?.

ext. Ipn Extended current rating.

Possible values: 100 to 400% or soft keys 120%, 150%, 200%, 300%, 400%.

Default: 120%.

ext. VA Extended burden range for ratio error and phase displacement

assessment according to IEC 61869-2.

The assessment of the ratio error and the phase displacement is usuallly performed down to a burden of 12.5% of the nominal burden. If the "ext. VA" parameter is set to "on", the assessment is performed for an extended range down to a burden of 1VA if the limit of 12.5% results in a burden higher than 1VA.

Possible values: Soft keys On or Off.

Default: On.

, FS1,

CT Analyzer User Manual

Specific parameters and settings displayed for IEEE C57.13 protection CTs

The following parameter is only displayed in the CT-Object card if the IEEE C57.13 standard is selected with the type "Prot. CT".

Param. Description Available for

Vb * Rated secondary terminal voltage.

Vk1

Ik1

RE(20*Isn) Ratio error at 20 * I

Rct Specified secondary winding resistance.

If the IEEE C57.13 standard is selected with the type "protection CT" (class C, K or T), the VA and Cos parameters are not accessible to the user. In this case, the user has to enter the terminal voltage V

Possible values: Integer values from 10 to 1200V or soft

keys ?

, 10V, 20V, 50V, 100V, 200V, 400V or 800V.

Default: ? or ?*.

* This parameter is relevant for assessment. No automatic assessment is available if the user did not enter data for this parameter prior to the test (see page 82).

User-defined measuring point.

User-defined measuring point 1.

Possible values: Integer values from 0.1V to 20.000V or

soft key ?

Default: ?.

User-defined measuring point.

User-defined measuring point 1.

Possible values: Integer values from 0.03mA to

30.000mA or soft key ?

Default: ?.

Possible values: Integer values from 1% to 99%.

Default: 10%.

Possible values: 0 to 3000 ohms or soft key ?

Default: ?

instead.

IEEE C57.13, class

C T X K

xx x

1. Acc. to IEEE C57.13 (1993)

2. If the question mark is entered for this parameter and a new test is started, the CT Analyzer automatically tries to determine the value using its integrated guesser function (see chapter 7 on page 131).

Omicron Lab CT Analyzer, CT SB2 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents

Preface

Using This Manual

Operator Qualifications and Safety Standards

Conventions and Symbols Used

Related Documents

Safety Rules

General Rules for Safe Operation

Orderly Measures

Disclaimer

1 Introduction

1.1 Designated Use

1.2 Functional Components of the CT Analyzer

1.2.1 Overview

1.2.2 Mains Connection Unit and Grounding

1.2.3 Compact Flash Card Slot

1.2.4 Remote Control Interface (PC Connection)

1.2.5 Inputs and Outputs

1.2.6 I/0 Key with Status LEDs

1.2.7 Display with Soft Keys

1.2.8 Keyboard

1.3 License-Depending Functional Scope

1.4 Scope of Delivery, Accessories, Available Licenses

2 Setup and Connection

2.1 General Safety Rules for Connecting and Operating the CT Analyzer

2.2 Setting Up the CT Analyzer

2.3 Connecting the CT Analyzer to a PC (optional)

2.4 Connection for Usual Applications

2.4.1 Wiring for a CT Test

2.4.2 Wiring for a Burden Test

2.4.3 Wiring for Primary Resistance Measurement

2.5 Connection for Special Applications

2.5.1 Measurement on a Gapped Core

2.5.2 Excitation Curve Measurement for an Unwound Iron Core

2.5.3 Measurement on a GIS (SF6) Switch Gear

2.5.4 Measurement on Bushing-Type CTs

2.5.5 VT Ratio Measurement Using QuickTest

2.5.6 VT Winding Resistance Measurement Using QuickTest

2.5.7 Polarity Check Using QuickTest and the CPOL Polarity Checker

2.6 Disconnection

2.7 Improving the Quality of Measurement Results

2.7.1 4-Wire Measurement vs. 2-Wire Measurement

2.7.2 Noise Reduction Techniques

3 Short Guide for Running a CT Test

4 Running a CT Test (Detailed)

4.1 Setting Up the CT Analyzer

4.2 Preparing and Configuring the Test

4.3 Running the Automatic Test and Connecting the CT Analyzer

4.4 After the Test is Finished

4.5 Disconnection

Operating and Configuring the CT Analyzer

5.1 Working in the User Interface

5.1.1 Displaying a Specific Card

5.1.2 Using the Soft Keys

5.1.3 Editing a Card

5.2 The Main Menu

5.3 New CT-Test

5.4 New MR-Test

5.5 New Quick-Test

5.6 File Handling

5.6.1 Available Functions

5.6.2 Working in the File System

5.7 Settings

5.7.1 Available Options in the Settings Menu

5.7.2 Default Test Card Selection

5.7.3 Miscellaneous Settings

5.8 Tools (Update Functions)

5.8.1 Available Functions

5.8.2 Update Text

5.8.3 Update Firmware

5.9 CT Analyzer Help System

5.10 Operating the CT Analyzer from a Computer

6 The CT Analyzer Test Cards

6.1 Overview of Test Cards

6.2 CT-Object Card

6.2.1 Available Soft Keys