Vanguard EZCT-2000C User Manual
TM
EZCT-2000C
DIGITAL CURRENT-TRANSFORMER TESTER
USER’S MANUAL
Vanguard Instruments Company, Inc.
1520 S. Hellman Ave.
Ontario, California 91761, USA
TEL: (909) 923-9390
FAX: (909) 923-9391
March 2014
Revision 1
EZCT-2000C USER’S MANUAL REV 1
SAFETY SUMMARY
FOLLOW EXACT OPERATING PROCEDURES
Any deviation from the procedures described in this User’s Manual may create one or more
safety hazards, may damage the EZCT-2000C, or cause errors in the test results. Vanguard
Instruments Company, Inc. assumes no liability for unsafe or improper use of the EZCT-2000C.
All safety precautions provided in this manual must be observed during all phases of testing
including test preparation, test lead connection, actual testing, and test lead disconnection.
SAFETY WARNINGS AND CAUTIONS
The EZCT-2000C can produce a voltage up to 2,000 Vac that can cause severe injury and/or
equipment damage. Due to this reason, the EZCT-2000C shall be used only by trained
operators.
The EZCT-2000C’s X output terminals are rated to 2,200 Vac working voltage. Any voltage above
2,200 Vac will damage the input circuitry. Please see section 3.2 for further information.
All devices under test shall be off-line and fully isolated. Never attempt to test any current
transformer still connected to a circuit. All current transformer terminals shall be isolated
before conducting any test with the EZCT-2000C.
Always ground the EZCT-2000C to a substation ground before connecting the test cables to a
transformer.
DO NOT MODIFY TEST EQUIPMENT
To avoid the risk of introducing additional or unknown hazards, do not install substitute parts or
perform any unauthorized modification to any EZCT-2000C test unit. To ensure that all designed
safety features are maintained, it is highly recommended that repairs be performed only by
Vanguard Instruments Company factory personnel or by an authorized repair service provider.
Unauthorized modifications can cause safety hazards and will void the manufacturer’s
warranty.
WARNING
Do not remove test leads during a test. Failure to heed this warning can result in electrical
shock to personnel and damage to the equipment.
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REV 1 EZCT-2000C USER’S MANUAL
TABLE OF CONTENTS
CONVENTIONS USED IN THIS DOCUMENT ........................................................................................................................................ 1
1.0 INTRODUCTION .................................................................................................................................................................. 2
1.1 General Description and Features................................................................................................................................. 2
1.2 Common Features (EZCT-2000C and EZCT-2000C Plus) ................................................................................................ 2
1.3 EZCT-2000C Plus Features ............................................................................................................................................. 4
1.4 Ordering Information .................................................................................................................................................... 5
1.5 Technical Specifications ................................................................................................................................................ 6
1.6 EZCT-2000C Controls and Indicators ............................................................................................................................. 7
2.0 PRE-TEST SETUP ................................................................................................................................................................. 9
2.1 Operating Voltages ....................................................................................................................................................... 9
2.2 LCD Screen Contrast Control ......................................................................................................................................... 9
2.3 Printer Paper Control .................................................................................................................................................... 9
2.4 Printer Paper ............................................................................................................. .................................................... 9
3.0 OPERATING PROCEDURES ................................................................................................................................................ 11
3.1 EZCT-2000C Cable Connections .................................................................................................................................. 11
3.2 EZCT-2000C X Input Voltage Warning ......................................................................................................................... 17
3.3 Performing Tests ......................................................................................................................................................... 18
3.3.1. Entering Test Record Header Information ........................................................................................................ 18
3.3.2. Performing Resistance, Excitation, and Ratio Tests .......................................................................................... 21
3.3.3. Performing a CT Burden Test (EZCT-2000C Plus Only) ...................................................................................... 32
3.3.4. Performing an Insulation Resistance Test ......................................................................................................... 37
3.3.5. Performing a Current Source Test (EZCT-2000C Plus Only) ............................................................................... 42
3.4 Working With Test Records ........................................................................................................................................ 44
3.4.1. Restoring and Printing a Test Record From Flash EEPROM ............................................................................... 44
3.4.2. Restoring and Printing a Test Record From a USB Flash Drive .......................................................................... 48
3.4.3. Printing a Restored Test Record ........................................................................................................................ 50
3.4.4. Printing a Directory of Test Records Stored in the EZCT-2000C’s Memory ....................................................... 52
3.4.5. Printing a Directory of Test Records Stored in a USB Flash Drive ...................................................................... 55
3.4.6. Copying Test Records to a USB Flash Drive ....................................................................................................... 57
3.4.7. Erasing Test Records From the Flash EEPROM .................................................................................................. 60
3.4.8. Erasing Test Records From a USB Flash Drive ................................................................................................... 63
3.5 Working With Test Plans ............................................................................................................................................. 66
3.5.1. Extracting the Test Plan From a Test Record ..................................................................................................... 66
3.5.2. Printing a Directory of Test Plans Stored in the EZCT-2000C’s Memory ........................................................... 68
3.5.3. Printing a Directory of Test Plans Stored in a USB Flash Drive .......................................................................... 70
3.5.4. Printing a Test Plan ............................................................................................................................................ 72
3.5.5. Erasing Test Plans From the Flash EEPROM ...................................................................................................... 74
3.5.6. Erasing Test Plans From a USB Flash Drive ........................................................................................................ 77
3.5.7. Loading a Test Plan from the EZCT-2000C’s Flash EEPROM .............................................................................. 80
3.5.8. Loading a Test Plan from a USB Flash Drive ...................................................................................................... 82
3.5.9. Running a Test Using a Loaded Test Plan .......................................................................................................... 84
3.5.10. Unloading a Test Plan from the Working Memory ............................................................................................ 88
4.0 CHANGING SETUP PARAMETERS ...................................................................................................................................... 89
4.1 Setting the Knee Point Marker .................................................................................................................................... 89
4.2 Enabling and Disabling the Buried CT in Transformer Delta Option ........................................................................... 91
4.2.1. Enabling the Buried CT in Transformer Delta Option ........................................................................................ 91
4.2.2. Disabling the Buried CT in Transformer Delta Option ....................................................................................... 92
4.3 Setting the Clock ......................................................................................................................................................... 96
4.4 Setting the Preferred Interface Language ................................................................................................................... 97
4.5 Printing Raw Memory Buffer Data .............................................................................................................................. 99
4.6 Disabling the H Voltage Checking Feature ................................................................................................................ 100
5.0 DIAGNOSTICS, VERIFICATION, AND TROUBLESHOOTING ............................................................................................... 102
5.1 Performing a Diagnostics Test ................................................................................................................................... 102
5.2 Verifying the EZCT-2000C’s V
5.3 Verifying the EZCT-2000C’s Ix Sense Circuit Using an External Meter ....................................................................... 105
5.4 Quickly Verifying the EZCT-2000C’s Turns Ratio Circuit ............................................................................................ 106
Sense Circuit Using an External Meter ...................................................................... 104
x
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EZCT-2000C USER’S MANUAL REV 1
5.5 Troubleshooting Guide ............................................................................................................................................. 107
6.0 Appendix A - Calculating Turns Ratio on a Shunt Reactor .............................................................................................. 108
LIST OF TABLES
Table 1. Ordering Information .......................................................................................................................................................... 5
Table 2. EZCT-2000C Technical Specifications .................................................................................................................................. 6
Table 3. Functional Descriptions of EZCT-2000C Controls and Indicators ........................................................................................ 8
Table 4. Descriptions of Tabulated Test Results Elements .............................................................................................................. 30
Table 5. Description of Test Plan Elements ..................................................................................................................................... 73
LIST OF FIGURES
Figure 1. EZCT-2000C Controls and Indicators .................................................................................. ................................................ 7
Figure 2. Typical EZCT-2000C Excitation and Ratio Test Cable Connections ................................................................................... 11
Figure 3. Connections for a typical high resistance measuring application .................................................................................... 12
Figure 4. Connections for a typical insulation resistance measurement for a CT with 5 terminals ................................................ 12
Figure 5. Connections for a typical insulation resistance measurement for a CT with 2 terminals ................................................ 13
Figure 6. EZCT-2000C CT Burden Test Cable Connection (EZCT-2000C Plus Only) .......................................................................... 14
Figure 7. EZCT-2000C Typical Current Source Connection (EZCT-2000C Plus Only) ........................................................................ 15
Figure 8. Bushing CT Connection on Delta Transformer ................................................................................................................. 16
Figure 9. Bushing CT Connection on Y Transformer ........................................................................................................................ 16
Figure 10. Sample CT Name Plate ................................................................................................................................................... 17
Figure 11. Typical EZCT-2000C Tabulated Report Printout ............................................................................................................. 29
Figure 12. Typical EZCT-2000C Graphic Report with Multiple Plot Curves ..................................................................................... 31
Figure 13. EZCT-2000C Typical Burden Test Results Report Printout ............................................................................................. 36
Figure 14. Connections for a typical high resistance measuring application .................................................................................. 37
Figure 15. Connections for a typical insulation resistance measurement for a CT with 5 terminals .............................................. 37
Figure 16. Connections for a typical insulation resistance measurement for a CT with 2 terminals .............................................. 37
Figure 17. EZCT-2000C Typical Insulation Resistance Test Results Report Printout ....................................................................... 41
Figure 18. Typical Internal Test Record Directory Printout ............................................................................................................. 54
Figure 19. Typical USB Flash Drive Record Directory Printout ........................................................................................................ 56
Figure 20. Typical EZCT-2000C Flash EEPROM Test Plan Directory Printout ................................................................................... 69
Figure 21. Typical USB Flash Drive Test Plan Directory Printout ..................................................................................................... 71
Figure 22. Typical Test Plan Printout .............................................................................................................................................. 73
Figure 23. Graphic Report Showing Knee Point Marker ................................................................................................................. 90
Figure 24. Buried CT in a Delta Transformer Illustration 1 .............................................................................................................. 94
Figure 25. Buried CT in a Delta Transformer Illustration 2 .............................................................................................................. 94
Figure 26. EZCT-2000C V
Figure 27. EZCT-2000C I
Figure 28. EZCT-2000C Turns Ratio Verification Test Connections ............................................................................................... 106
Figure 29 ....................................................................................................................................................................................... 108
Figure 30 ....................................................................................................................................................................................... 109
Figure 31 ....................................................................................................................................................................................... 110
Figure 32 ....................................................................................................................................................................................... 111
Figure 33 ....................................................................................................................................................................................... 112
Figure 34 ....................................................................................................................................................................................... 113
Figure 35 ....................................................................................................................................................................................... 114
Figure 36 ....................................................................................................................................................................................... 114
Verification Test Connections .............................................................................................................. 104
x
Verification Test Connections ............................................................................................................... 105
x
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CONVENTIONS USED IN THIS DOCUMENT
This document uses the following conventions:
•
A key or switch on the EZCT-2000C is indicated as
[KEY].
Menu options are referenced as (MENU OPTION).
•
Screen and menu names are referenced as “SCREEN/MENU NAME”.
•
The terms “test record” and “test shot” are used interchangeably.
•
The terms “USB Flash drive” and “USB thumb drive” are used interchangeably.
•
• EZCT-2000C LCD screen output is shown as:
1. OPTION 1
2. OPTION 2
3. OPTION 3
4. OPTION 4
5. OPTION 5
• Warning messages are indicated as:
Warning message
WARNING
• Important notes are indicated as:
Note details
NOTE
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EZCT-2000C USER’S MANUAL REV 1
1.0 INTRODUCTION
1.1 General Description and Features
The EZCT-2000C is Vanguard’s third-generation microprocessor-based current transformer test
set. The EZCT-2000C is available in two models, the EZCT-2000C and EZCT-2000C Plus. Designed
specifically for CT testing, the EZCT-2000C has the following outstanding features that can
greatly increase productivity and save time during the commissioning stage:
• Performs CT excitation, current-ratio, polarity, and phase angle tests
• Automatically demagnetize CT under test when performing excitation tests
• Measure the DC resistance of transformer windings from 100 micro-ohms to 20 ohms
• Stand-alone or computer-controlled via USB or optional Bluetooth wireless interface
In addition to the above, the EZCT-2000C Plus offers the following features:
• Measures the insulation resistance of the CT's secondary winding
• Measures the CT’s load burden
• Provides a programmable current source (0-20A) that can be used to verify CT loads
The EZCT-2000C’s test leads can be connected to all the CT output terminals, and the complete
CT test can be performed automatically without any operator intervention.
1.2 Common Features (EZCT-2000C and EZCT-2000C Plus)
Excitation Test
The CT excitation test is performed using the ANSI/IEEE C57.13.1 test method. Test voltage
ranges from 50, 300, 500,1200 and 2000 Vac can be selected for the excitation test. The test
voltage is raised and lowered automatically by the EZCT-2000C. The excitation test voltage and
current data is collected and stored in the EZCT-2000C’s internal memory. Knee point voltages
(ANSI 10/50, IEC 60044, IEEE-30, IEEE-45) are calculated and printed on the test report. All of
the EZCT-2000C’s test leads can be connected to the CT output terminals (X1, X2, X3, X4 and
X5), and there is no lead switching required during testing. This convenient arrangement allows
for testing any of the 10 possible combinations of X1 to X5. Up to 10 excitation tests can be
stored in one record. Once the test is completed, the test report and CT excitation curves can
be printed on the built-in thermal printer.
Demagnetization
The EZCT-2000C automatically demagnetizes the CT under test when performing an excitation
test.
Winding Resistance Test
The EZCT-2000C can measure the DC resistance of transformer windings from 100 micro-ohms
to 10 ohms.
Ratio and Polarity Tests
The CT current-ratio is determined using the ANSI/IEEE C57.12.90 measurement method. A test
voltage is applied on any two terminals (X1 to X5) of the CT, and the induced voltage is
measured through the H1 and H2 terminals of the CT. The CT current-ratio is displayed and also
stored in memory. The current-ratio is measured from 0.8 to 5,000. The CT winding polarity is
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REV 1 EZCT-2000C USER’S MANUAL
displayed as a “+” sign (in-phase) or a “-” sign (out-of-phase) and is annotated with the phase
angle in degrees. The CT current ratio error and phase displacement is also calculated based on
the CT burden (or rated power) and rated current.
Current Ratio and Phase Error Tables
As part of the tabulated test results, the EZCT-2000C can also print the current ratio and current
phase error tables.
Test Record Header Information
Test record header information, including the company, substation name, circuit ID,
manufacturer, mode, CT serial number, and the operator’s name, can be stored with each
record. In addition to the test record header, a 20-character test description for each test in the
record (10 tests per record) can also be entered.
User Interface and Display
The EZCT-2000C features a back-lit LCD screen (240 x 128 pixels) that is clearly viewable in both
bright sunlight and low-light levels. An "QWERTY"-style membrane keypad is used to enter test
information and to control the unit’s functions.
Built-in Thermal Printer
A 4.5-inch wide built-in thermal printer can print the CT test results and excitation curves.
Computer Interface
The EZCT-2000C can be used as a stand-alone unit or can be computer-controlled. It can be
connected to a PC via the USB port or wirelessly via Bluetooth. In computer-controlled mode,
using the included CT Analysis Software, test records can be downloaded from the EZCT2000C’s memory, or CT tests can be run from the PC. Test plans can also be created with the
provided software. A test plan defines the various test parameters (test voltage, current range,
nameplate ratios, etc.) and can be used to quickly perform tests. Additionally, tabulated test
records are automatically exported to PDF, Excel, and XML formats for further analysis.
Internal Test Record Storage
The EZCT-2000C can store up to 140 test records in Flash EEPROM. Each record may contain up
to 10 excitation curves, burden test reports, current ratio readings, and polarity and DC
resistance readings. Test records can be recalled and printed on the built-in thermal printer.
They can also be transferred to a PC using the USB port, wirelessly via Bluetooth, or via the USB
Flash drive interface port.
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EZCT-2000C USER’S MANUAL REV 1
Internal Test Plan Storage
The EZCT-2000C can store up to 128 CT test plans in Flash EEPROM. A test plan is comprised of
the excitation test voltage, current range selection, CT nameplate ratios, and CT winding
terminal combinations (X1 to X5) for each test and also includes the insulation test definition.
Up to 10 test definitions can be stored per test plan. The ability to store test plans makes CT
testing an extremely simple process. To perform a test, the EZCT-2000C is connected to the CT
terminals and a test plan is selected to run.
Creating test plans for the EZCT-2000C is also a simple process. A test plan can be created using
the EZCT-2000C’s keypad or can be created on a PC (with provided software) and then
downloaded to the EZCT-2000C via the USB port or Bluetooth. For added convenience, test
plans can also be copied from a USB Flash drive to the EZCT-2000C via the USB Flash drive
interface.
External Data Storage
The EZCT-2000C features a USB Flash drive interface that makes it very convenient to store and
transfer test records and test plans. By using a USB Flash drive, test records and test plans can
be quickly transferred between a computer and the EZCT-2000C without the need to connect
the unit to the computer.
1.3 EZCT-2000C Plus Features
CT Winding Insulation Resistance Test Feature
The EZCT-2000C Plus can also measure the insulation resistance of the CT’s secondary winding
using a test voltage up to 1000 Vdc. The DC winding resistance reading range is from 2 to 500
Mega-ohms. The insulation resistance test results are displayed and printed on the report.
CT Burden Test
The EZCT-2000C Plus can measure the CT’s actual connected burden by injecting a 1A or 5A test
current into the load. The CT burden measurements (Voltage, current, Cos ϕ, and burden
impedance) are displayed on the screen and printed on the test report. This important test
verifies the actual CT measured burden before putting the CT in service, thus avoiding any
potential configuration conflicts.
Current Source
The EZCT-2000C Plus offers an optional programmable current source (0-20A, 0-15Vac) that can
be used to verify CT loads. The on-time timer and output current are displayed on the LCD
screen.
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REV 1 EZCT-2000C USER’S MANUAL
1.4 Ordering Information
To order additional EZCT-2000C units or accessories, please contact your Vanguard Instruments
sales representative and reference the part numbers listed in Table 1. Please visit our web site
at http://www.vanguard-instruments.com/sales-reps
to find your nearest Vanguard
Instruments sales representative.
Table 1. Ordering Information
Part Number Description
9019-UC EZCT-2000C [110V] Unit and Cables
9034-UC EZCT-2000C [220V] Unit and Cables
9019-SC EZCT-2000C Shipping Case
9019-IC EZCT-2000C Insulation Resistance Test and Current Source Feature
8000-0157 Replacement H cable set with banana jacks
8000-0108 Replacement X cable set
8000-0109 Replacement current and Megger cable set
8000-0005 USB cable
8000-0017 Large cable carrying duffel bag
TP4-CS TP4 thermal printer paper (case of 24 rolls)
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1.5 Technical Specifications
Table 2. EZCT-2000C Technical Specifications
TYPE Portable current-transformer test set
PHYSICAL SPECIFICATIONS 19"W x 13"H x 16"D (48.3 cm x 33cm x 40.1 cm); Weight: 73 lbs (33.1 kg)
INPUT POWER 100 – 120 Vac or 200 – 240 Vac (factory pre-set), 50/60 Hz
MEASUREMENT METHOD ANSI/IEEE C57.12.90 and ANSI/IEEE C57.13.1 standards
OUTPUT TEST VOLTAGES 0 – 50 Vac @ 10A max; 0 – 300 Vac @ 10A max; 0 – 500 Vac @ 5A max;
0 – 1200 Vac @ 1.2A max; 0 – 2000 Vac @ 1A max
CURRENT SOURCE
(EZCT-2000C Plus Only)
CURRENT SOURCE DISPLAY
(EZCT-2000C Plus Only)
VOLTAGE READING RANGE 0 – 2,200 Vac; Accuracy: ±1.0% of reading, ±1 volt
CURRENT READING RANGE
CT CURRENT RATIO RANGE 0.8 – 999: 0.1%, 1000 – 1999: 0.3%, 2000 – 5000: 1%
PHASE ANGLE
MEASUREMENT
RESISTANCE READING
RANGE
INSULATION RESISTANCE
TEST FEATURE
(EZCT-2000C Plus Only)
DISPLAY Backlit LCD Screen (240 x 128 pixels; 114mm x 64mm); viewable in bright
PRINTER Built-in 4.5-inch wide thermal printer
COMPUTER INTERFACES One USB port and Bluetooth wireless intaerface
EXTERNAL DATA STORAGE One USB Flash drive interface port (Flash drive not included)
PC SOFTWARE Windows®-based CT Analysis software is included with purchase price
INTERNAL TEST RECORD
STORAGE
INTERNAL TEST PLAN
STORAGE
SAFETY Designed to meet UL 6110A-1 and CAN/CSA C22.2 No. 1010.1-92
ENVIRONMENT
CABLES One 20-foot cable set (X1-X5), one 35-foot H cable set, current source
WARRANTY One year on parts and labor
1 – 20A @ 0 – 15 Vac
Test current and current on-time
0 – 10A; Accuracy: ±1.0% of reading, ±0.02A
0 – 360 degrees; Accuracy: ± 1.0 degree)
100 micro-ohms – 10 ohms; Accuracy: 2% of reading, ±1 count, ±10 microohms
2 Mega-ohms – 500 Mega-ohms; Accuracy: 3% of reading, 500 – 1000
Vdc test voltage
sunlight and low-light levels
Stores 140 test records. Each test record may contain up to 10 sets of
excitation, resistance and ratio data
Stores 128 test plans. Each test plan can store 10 excitation test voltage
and current settings
standards
Operating: -10°C to 50°C (15°F to +122°F); Storage: -30°C to 70°C (-22°F
to +158°F)
cables, insulation test cables, power cord, ground cable. A transportation
case is included with the purchase price
EZCT-2000C USER’S MANUAL REV 1
The above specifications are valid at nominal operating voltage and at a
temperature of 25°C (77°F). Specifications may change without prior notice.
NOTE
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REV 1 EZCT-2000C USER’S MANUAL
1.6 EZCT-2000C Controls and Indicators
The EZCT-2000C’s controls and indicators are shown in Figure 1 below. A leader line with an
index number points to each control and indicator, which is cross-referenced to a functional
description in Table 3. The table describes the function of each item on the control panel. The
purpose of the controls and indicators may seem obvious, but users should become familiar
with them before using the EZCT-2000C. Accidental misuse of the controls will usually cause no
serious harm. Users should also be familiar with the safety summary found on the front page of
this User’s Manual.
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Figure 1. EZCT-2000C Controls and Indicators
EZCT-2000C USER’S MANUAL REV 1
Table 3. Functional Descriptions of EZCT-2000C Controls and Indicators
Item
Number
1
2-6
7
8
9
10
11
12
13
14
15
16
17
18
19
Panel Markings Functional Description
INSULATION
RESISTANCE
METER
X1, X2, X3, X4, X5
H Current transformer primary input test cable connectors.
GROUND Grounding stud.
AC receptacle.
100-120Vac, 12A
50-60Hz
HIGH VOLTAGE
PRESENT
Rugged, "QWERTY"-style membrane keypad
EMERGENCY
TURN OFF
“PUSH”
Built-in 4.5-inch wide thermal printer
USB PC USB PC interface.
USB MEM USB Flash drive interface
AC CURRENT
SOURCE
0 – 20A
BLUETOOTH Bluetooth indicator (Optional)
Insulation resistance meter connectors.
Current transformer excitation voltage connectors. Each set of connectors
contains a test voltage connector and sensing connector. The EZCT-2000C’s X
output terminals are rated to 2,200 Vac working voltage. Any voltage above
2,200 Vac will damage the input circuitry.
Power switch with built-in circuit breaker.
Back-lit graphic LCD screen (128 x 64); viewable in bright sunlight and low light
levels.
LED warning indicator that is illuminated when high voltage is present.
Emergency turn off switch.
AC current source connectors (EZCT-2000C Plus Only)
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2.0 PRE-TEST SETUP
2.1 Operating Voltages
The EZCT-2000C’s operating voltage is preset at the factory for 100-120 Vac, 50/60 Hz or 200240 Vac, 50/60 Hz.
2.2 LCD Screen Contrast Control
To increase the LCD screen contrast, press and hold the [∧] key for two seconds. Release the
button when the desired contrast level has been reached.
To decrease the LCD screen contrast, press and hold the [∨] key for two seconds. Release the
button when the desired contrast level has been reached.
2.3 Printer Paper Control
To advance the thermal printer paper, press and release the [∧] key.
To retract the thermal printer paper, press and release the [∨] key.
2.4 Printer Paper
The EZCT-2000C’s built-in thermal printer uses 4.5-inch wide thermal paper for printing test
results. To maintain the highest print quality and to avoid paper jams, the use of thermal paper
supplied by Vanguard Instruments Company is highly recommended. Additional paper can be
ordered from the following sources:
Vanguard Instruments Co, Inc.
1520 S. Hellman Avenue
Ontario, CA 91761
Tel: 909-923-9390
Fax: 909-923-9391
Part Number: TP4-CS (24 rolls) or TP4-3R (3 rolls)
BG Instrument Co.
13607 E. Trent Avenue
Spokane, WA 99216
Tel: 509-893-9881
Fax: 509-893-9803
Part Number: VIC TP-4 paper
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EZCT-2000C USER’S MANUAL REV 1
2.5 Replacing the Thermal Printer Paper
The roll of thermal paper is housed inside a dispenser underneath the printer cover. To replace
the paper, follow the steps below:
• Unscrew the two large printer cover screws and remove the printer cover.
• Remove the leftover thermal paper roll from the paper holder.
• Unroll the new thermal paper roll.
• Feed the thermal paper into the slot between the paper pocket and the rubber roller.
The printer will automatically pull the paper under the thermal head.
• Place the paper roll into the paper holder.
• Lift the thermal head and align the thermal paper if necessary.
• Re-install the printer cover.
Thermal paper has a chemical coating on one side of the paper. This side should be
facing the thermal print head. Incorrect paper loading may result in blank output on
NOTE
the thermal paper.
The thermal paper will show a red stripe to indicate that the roll is about to run out
of paper.
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REV 1 EZCT-2000C USER’S MANUAL
3.0 OPERATING PROCEDURES
3.1 EZCT-2000C Cable Connections
Always connect the EZCT-2000C to the substation ground before connecting any test cables.
The EZCT-2000C is supplied with five 20-foot X test cables and one 35-foot H cable. The X cable
connections are required to run the current transformer excitation test. The H and X cable
connections are required to run the transformer turns-ratio test. A typical excitation and ratio
test connection is shown in Figure 2. The insulation resistance test connection is shown in
Figure 3. The burden test connection is shown in Figure 6. The current source test connection is
shown in Figure 7. Transformer bushing CT connections for Delta and Y transformers are shown
in Figure 8 and Figure 9, respectively.
Figure 2. Typical EZCT-2000C Excitation and Ratio Test Cable Connections
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EZCT-2000C USER’S MANUAL REV 1
Figure 3. Connections for a typical high resistance measuring application
Figure 4. Connections for a typical insulation resistance measurement for a CT with 5 terminals
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Figure 5. Connections for a typical insulation resistance measurement for a CT with 2 terminals
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EZCT-2000C USER’S MANUAL REV 1
Figure 6. EZCT-2000C CT Burden Test Cable Connection (EZCT-2000C Plus Only)
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Figure 7. EZCT-2000C Typical Current Source Connection (EZCT-2000C Plus Only)
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EZCT-2000C USER’S MANUAL REV 1
Figure 8. Bushing CT Connection on Delta Transformer
Figure 9. Bushing CT Connection on Y Transformer
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3.2 EZCT-2000C X Input Voltage Warning
The EZCT-2000C X output terminals are rated to 2,200 Vac working voltage. Any voltage present
at these terminals above 2,200 Vac may damage the X sense circuitry, cause false readings, or
both. An example of a typical situation where this may occur is shown in Figure 10 below.
Figure 10. Sample CT Name Plate
For the above example CT, the turns ratio between X1-X4 is 3150 to 1. The turns ratio between
X1-X2 is 400 to 1. The turns ratio between X1-X4 and X1-X2 is 7.88 (3150/400). If a test voltage
of 300 Vac is applied to the X1-X2 terminals, a voltage of 2,364 Vac (300 Vac x 7.88) will be
induced at the X1-X4 terminals. If all the test leads are connected to the EZCT-2000C and the
excitation test is performed on the X1-X2 terminals, the voltage induced at the X1-X4 terminals
will exceed 2,000 Vac as the voltage across the X1-X2 terminals increases above 250 Vac. A
“Flash-Over” condition may occur and damage the EZCT-2000C. In this case, the user should
only connect the X1-X2 leads and run its excitation test, then connect the X4 lead before
running the X1-X4 excitation test.
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EZCT-2000C USER’S MANUAL REV 1
3.3 Performing Tests
3.3.1. Entering Test Record Header Information
You can enter the test record header information before performing tests. The record header
includes identifying information such as the company, station, circuit, model number, etc. Once
the header information has been entered, it will apply to all subsequent test records. To enter
the header information:
a. When the unit is turned on and the firmware has been loaded, you will be presented
with the “START-UP” menu as shown below:
1. RUN TEST 04/15/13
2. SETUP 10:15:35
3. TEST PLANS
4. DIAGNOSTICS
5. CURRENT SOURCE
Press the [2] key (SETUP).
b. The following screen will be displayed:
1. RECORD ID
2. PRINT RECORD
3. RECORD DIRECTORY
4. SAVE/RESTORE RECORD
5. ERASE RECORD
6. NEXT PAGE
Press the [1] key (RECORD ID)
c. The following screen will be displayed:
COMPANY:
vanguard
↑↓ TO POSITION
"enter" to accept
Type the company name using the keypad and then press the
[ENTER] key.
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REV 1 EZCT-2000C USER’S MANUAL
d. The following screen will be displayed:
STATION:
LAB
↑↓ TO POSITION
"enter" to accept
Type the station name using the keypad and then press the [ENTER] key.
e. The following screen will be displayed:
CIRCUIT:
CIRCUIT 1
↑↓ TO POSITION
"enter" to accept
Type the circuit information using the keypad and then press the [ENTER] key.
f. The following screen will be displayed:
MANUFACTURER:
ABB
↑↓ TO POSITION
"enter" to accept
Type the manufacturer name using the keypad and then press the [ENTER] key.
g. The following screen will be displayed:
MODEL:
EZCT2000C
↑↓ TO POSITION
"enter" to accept
Type the model information using the keypad and then press the [ENTER] key.
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h. The following screen will be displayed:
SERIAL NUMBER:
26002
↑↓ TO POSITION
"enter" to accept
Type the serial number using the keypad and then press the [ENTER] key.
i. The following screen will be displayed:
COMMENTS:
no comment
↑↓ TO POSITION
"enter" to accept
EZCT-2000C USER’S MANUAL REV 1
Enter any relevant comments using the keypad and then press the [ENTER] key.
j. The following screen will be displayed:
OPERATOR:
TA
↑↓ TO POSITION
"enter" to accept
Type the operator’s name using the keypad and then press the [ENTER] key. All
header information will be saved, and you will be returned to the “START-UP” menu.
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REV 1 EZCT-2000C USER’S MANUAL
3.3.2. Performing Resistance, Excitation, and Ratio Tests
The following procedure describes the general steps for performing excitation, resistance, and
ratio tests.
a. When the EZCT-2000C is turned on, it will first go through a start-up cycle and load the
firmware. Then the “START-UP” menu will be displayed as shown below:
1. RUN TEST 04/15/13
2. SETUP 11:18:25
3. TEST PLANS
4. DIAGNOSTICS
5. CURRENT SOURCE
Press the [1] key (RUN TEST) to start a test.
b. The following screen will be displayed:
1. Res, excit & ratio
2. excitation & ratio
3. excitation only
4. ratio only
5. resistance & excit
6. burden test only
7. insulation tst only
Select the test type by pressing the corresponding key ([1] - [5])
c. The following screen will be displayed:
SELECT TAP:
1. X1-X2
2. X1-X3
3. X1-X4
4. X1-X5
5. NEXT PAGE
Select the tap connection by pressing the corresponding key (
[1] - [4]). If the tap
connection is not listed, press the [5] key to view the next page of options.
d. If the selected test included an excitation test, the following screen will be displayed:
SELECT VOLTAGE RANGE:
1. 50V
2. 300V
3. 500V
4. 1200V
5. 2000V
Select a test voltage range by pressing the corresponding key (
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[1] - [5]).
EZCT-2000C USER’S MANUAL REV 1
e. If the selected test included an excitation test, the following screen will be displayed:
SET TEST CURRENT:
1. 0.2A
2. 0.5A
3. 1A
4. 2A
5. 5A
6. 10A
Select the maximum test current for the excitation test by pressing the corresponding
key (
[1] - [6]
).
f. If the selected test included a ratio test, the following screen will be displayed:
XFMR NAME PLATE RAT.
1. YES
2. NO
1. YES
Press the
[1]
key if you would like to enter the CT nameplate values. The
following screen will be displayed:
ENTER PLATE RATIO:
0 :
Type the first number using the keypad.
You can press the
NOTE
[CLEAR]
key to restart a field entry if necessary.
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REV 1 EZCT-2000C USER’S MANUAL
Press the [ENTER] key. The following screen will be displayed:
ENTER PLATE RATIO:
1000 : 0.0
Type the second number using the keypad and then press the
Continue to step g.
2. NO
Press the
[2] key if you do not want to enter the CT nameplate values. Continue
to step g.
g. The following screen will be displayed:
ENTER TEST 1 NOTE:
_
↑↓ to position
"ENTER" TO ACCEPT
ENTER PLATE RATIO:
1000 : 5.0
[ENTER] key.
Use the keypad to enter a test note. The test note field is 20 characters long. One test
note can be saved for each test.
Press the [ENTER] key when you are done typing the note.
h. The following screen will be displayed:
calc err vs burden?
1. yes
2. no
Press the
[1] key (YES). Selecting this option will print the current ratio error table and
current phase error table as part of the tabulated test results. Please see Figure 11,
items 19 and 20.
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i. The following screen will be displayed:
ENTER BURDEN VA:
(500.0 max)
0.0
EZCT-2000C USER’S MANUAL REV 1
Type the burden value using the keypad and then press the
j. The following screen will be displayed:
ENTER cos ϕ:
(0.00 - 1.00)
0.0
Type the Cos ϕ value using the keypad and then press the
k. The following screen will be displayed:
rated secondary cur:
1. 5A
2. 1A
[ENTER] key.
[ENTER] key.
Select the rated secondary current by pressing the
[1] key (5A) or [2] key (1A).
l. The following screen will be displayed showing a summary of the test parameters:
TEST 1 parameters:
300V 1.0A x1-x2
"START" to begin
Press the [START] key to start the test.
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REV 1 EZCT-2000C USER’S MANUAL
m. If the selected test included a resistance test, the following screen will be displayed
momentarily:
CABLES ENERGIZED!
300V 1.0A x1-x2
DC RESISTANCE TEST
The following screen will then be displayed:
CABLES ENERGIZED!
300V 1.0A x1-x2
RESISTANCE = 215.1
Ω
The “HIGH VOLTAGE PRESENT” light will be illuminated to indicate that high
voltage is present.
NOTE
n. If the selected test included a ratio test, the following screen will be displayed
momentarily:
CABLES ENERGIZED!
300V 1.0A x1-x2
I= 0.0004 AMPS
V= 34.2 VAC
The following screen will then be displayed:
RATIO TEST
V
= 99.5 VH = 0.497
x
I=0.0402 RAT=+199.88
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When the testing is finished, the test results graph will be displayed:
Press any key on the keypad to continue.
o. The following screen will be displayed:
print test results?
1. YES
2. NO
EZCT-2000C USER’S MANUAL REV 1
Press the [1] key (YES) if you would like to print the test results. The test results will be
printed on the thermal printer. A typical EZCT-2000C tabulated test report printout is
shown in Figure 11. A typical graphic report is shown in Figure 12.
Press the [2] key (NO) if you do not want to print the test results.
p. The following screen will be displayed:
KEEP THIS TEST?
1. YES
2. NO
Press the
[1] key (YES) to keep the test results.
q. The following screen will be displayed:
TEST 1 SAVED
Press any key to continue.
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