Vanguard ATRT-03-03B S2 User Manual

ATRT-03 S2, ATRT-03A S2, and ATRT-03B S2

THREE-PHASE TRANSFORMER TURNS-RATIO METERS

USER’S MANUAL

Vanguard Instruments Company, Inc.

1520 S. Hellman Ave.

Ontario, California 91761, USA

TEL: [phone]	February 2014
FAX: [phone]	Revision 2

ATRT-03 S2, ATRT-03A S2, AND ATRT-03B S2 USER’S MANUAL REV 2

SAFETY SUMMARY

This manual applies to the ATRT-03 S2, ATRT-03A S2, and ATRT-3B S2 current transformer turns-ratio meters. The operating procedures are virtually the same for all three models, and any differences are clearly described where applicable.

FOLLOW EXACT OPERATING PROCEDURES

Any deviation from procedures described in this User’s Manual may create one or more safety hazards, damage the ATRT-03/03A/03B S2, damage the test transformer, or cause errors in the test results. Vanguard Instruments Company, Inc. assumes no liability for unsafe or improper use of the ATRT-03/03A/03B S2.

SAFETY WARNINGS AND CAUTIONS

The ATRT-03/03A/03B S2 shall be used only by trained operators. All transformers under test shall be off-line and fully isolated. Always ground the ATRT-03/03A/03B S2 to a substation ground before connecting the test cables to a transformer. Do not perform test procedures or service unless another person is also present who is capable of rendering aid and resuscitation.

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 ATRT-03/03A/03B S2 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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	TABLE OF CONTENTS
CONVENTIONS USED IN THIS DOCUMENT .....................................................................................		1
1.0	INTRODUCTION....................................................................................................................	2
1.1	General Description and Features ...................................................................................	2
1.2	Technical Specifications ...................................................................................................	4
1.2.1. ATRT-03 S2 Technical Specifications ........................................................................		4
1.2.2. ATRT-03A S2 Technical Specifications......................................................................		5
1.2.3. ATRT-03B S2 Technical Specifications ......................................................................		6
1.3	Controls and Indicators....................................................................................................	7
2.0	PRE-TEST SETUP .................................................................................................................	13
2.1	Operating Voltages ........................................................................................................	13
2.2	LCD Screen Contrast Control..........................................................................................	13
2.3	Printer Paper Control.....................................................................................................	13
2.4	Printer Paper..................................................................................................................	13
2.5	Replacing the Load Tap Changer Controller Fuses ........................................................	14
3.0	OPERATING PROCEDURES .................................................................................................	16
3.1	Connection Diagrams.....................................................................................................	16
3.1.1. Typical Front Panel Connections....................................................................................		16
3.1.2. Typical Connections to a Load Tap Changer (LTC).........................................................		17
3.1.3. Typical Connections to a Delta-Wye Transformer.........................................................		18
3.2	Setting the Test Voltage.................................................................................................	26
3.3	Setting the Date and Time .............................................................................................	28
3.4	Performing Tests............................................................................................................	29
3.4.1. Entering Test Record Header Information .............................................................		29
3.4.2. Testing a Single Phase Transformer .......................................................................		33
3.4.3. Testing a Dyn1 (12,000 V/208 V) Transformer.......................................................		42
3.4.4. Testing a Three Phase Transformer Using Auto Detect Mode ..............................		52
3.5	Working With Test Records ...........................................................................................	59
3.5.1. Saving Test Results to a Test Record ......................................................................		59
3.5.2. Restoring a Test Record From Flash EEPROM........................................................		62
3.5.3. Restoring a Test Record From a USB Flash Drive ...................................................		67
3.5.4. Copying Test Records to a USB Flash Drive............................................................		71
3.5.5. Printing or Displaying a Test Record ......................................................................		74
3.5.6. Printing a Test Record Directory (ATRT-03 S2 and ATRT-03A S2 Only)..................		77
3.5.7. Viewing a Test Record Directory on the LCD Screen (ATRT-03B S2 Only) .............		80
3.5.8. Erasing Test Records from the Flash EEPROM .......................................................		82
3.5.9. Erasing Test Records from a USB Flash Drive.........................................................		86
3.6	Working With Test Plans................................................................................................	89
3.6.1. Performing a Test Using a Transformer Test Plan..................................................		89
3.6.2. Unloading a Test Plan From the Working Memory................................................		96
3.6.3. Printing a Test Plan Directory (ATRT-03 S2 and ATRT-03A S2 Only) ......................		97
3.6.4. Viewing a Test Plan Directory on the LCD Screen (ATRT-03B S2 Only)..................		99
3.6.5. Printing a Test Plan (ATRT-03 S2 and ATRT-03A S2 Only) ....................................		101
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3.6.6. Saving a Test Plan .................................................................................................	104
3.6.7. Copying a Test Plan to a USB Flash Drive .............................................................	106
3.6.8. Erasing Test Plans .................................................................................................	108
4.0 DIAGNOSTICS, VERIFICATION, AND TROUBLESHOOTING ...............................................	112
4.1 Performing an H and X Cable Diagnostic Test .............................................................	112
4.2 Performing a Verification Test .....................................................................................	114
5.0 UPGRADING FIRMWARE ..................................................................................................	116
APPENDIX A – TRANSFORMER VECTOR GROUP CODES .............................................................	119
APPENDIX B – Common ANSI Transformer Descriptions ...........................................................	120
APPENDIX C – CEI/IEC 60076-1 Transformer Descriptions .........................................................	128
APPENDIX D – Australian Std.2374 Transformer Descriptions...................................................	135

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	LIST OF TABLES
Table 1. ATRT-03 S2 Technical Specifications .................................................................................		4
Table 2. ATRT-03A S2 Technical Specifications...............................................................................		5
Table 3. ATRT-03B S2 Technical Specifications...............................................................................		6
Table 4. Functional Descriptions of ATRT-03 S2 Controls and Indicators ......................................		8
Table 5. Functional Descriptions of ATRT-03A S2 Controls and Indicators ..................................		10
Table 6.	Functional Descriptions of ATRT-03B S2 Controls and Indicators ..................................	12
Table 7.	Descriptions of Single Phase Test Results Elements (Column Format) ..........................	39
Table 8.	Descriptions of Single Phase Test Results Elements (Detailed Format) .........................	41
Table 9.	Descriptions of Dyn1 Test Results Elements (Column Format) ......................................	49
Table 10. Descriptions of Dyn1 Test Results Elements (Detailed Format) ...................................		51

LIST OF FIGURES
Figure 1. ATRT-03 S2 Controls and Indicators ................................................................................	7
Figure 2. ATRT-03A S2 Controls and Indicators ..............................................................................	9
Figure 3. ATRT-03B S2 Controls and Indicators ............................................................................	11
Figure 4. Typical Front Panel Cable Connections..........................................................................	16
Figure 5. Typical Connections to a Load Tap Changer (LTC).........................................................	17
Figure 6. Typical H & X Cable Connections to a Delta-Wye Transformer.....................................	18
Figure 7. Typical Connections to a Single Phase Transformer......................................................	19
Figure 8. Typical Connections to a Single Phase Auto Transformer .............................................	19
Figure 9. Typical Connections to a Type A Voltage Regulator ......................................................	20
Figure 10. Typical Connections to a Type B Voltage Regulator ....................................................	20
Figure 11. Typical Connections to a Donut Type (un-mounted) Current Transformer (CT).........	21
Figure 12. Typical Connections to a Multi-Tap Current Transformer...........................................	22
Figure 13. Typical Connections to a Bushing Mount CT on a Single Phase Transformer .............	23
Figure 14. Typical Connections to Bushing Mount CT's on Delta Transformer............................	24
Figure 15. Typical Connections to Bushing Mount CT's on Wye Transformer .............................	25
Figure 17. Single Phase Test Results Printout - Column Format ..................................................	39
Figure 18. Single Phase Test Results Printout - Detailed Format .................................................	40
Figure 19. Dyn1 Test Results Printout - Column Format ..............................................................	48
Figure 20. Dyn1 Test Results Printout - Detailed Format .............................................................	50
Figure 21. Typical USB Flash Drive (Thumb Drive) Test Record Directory Printout .....................	79
Figure 22. Typical Internal Flash EEPROM Test Record Directory Printout..................................	79
Figure 23. Test Plan Test Results Printout ....................................................................................	95
Figure 24. Sample Printout of a Test Plan from a USB Flash Drive.............................................	102
Figure 25. Sample Printout of a Test Plan from Internal Memory .............................................	103
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CONVENTIONS USED IN THIS DOCUMENT

This document uses the following conventions:

•The general term “ATRT” is used in this manual to refer to any of the ATRT-03 S2 models (ATRT-03 S2, ATRT-03A S2, and ATRT-3B S2).

•A key, switch, or knob on the ATRT is indicated as [KEY], [SWITCH], [KNOB].

•Menu names are referenced as “MENU NAME”

•ATRT LCD screen output is shown as:

1.OPTION 1

2.OPTION 2

3.OPTION 3

4.OPTION 4

5.OPTION 5

•When instructions are provided, the menu item that should be selected is outlined with a rectangle as shown below (option 3 should be selected):

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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1.0INTRODUCTION

1.1General Description and Features

The ATRT-03 S2 line is Vanguard’s third generation family of microprocessor-based, automatic, three phase, transformer turns-ratio testers. The ATRT-03 S2 line consists of the following three models:

•The ATRT-03 S2 is a line-powered, 100-240 Vac, 50/60 Hz turns-ratio tester featuring a built-in thermal printer.

•The ATRT-03A S2 can be powered either by an internal rechargeable lead acid battery, by 100-240 Vac, or by a 12 Vdc external source. The internal battery provides 3 hours of operational time. The ATRT-03A S2 also features a built-in thermal printer.

•The ATRT-03B S2 is a line-powered, 100-240 Vac, 50/60 Hz turns-ratio tester without a built-in thermal printer.

The general term “ATRT-03 S2” or “ATRT” is used in this manual to refer to any of the ATRT-03 S2 models. Any differences are clearly described where applicable.

The ATRT-03 S2 determines the transformer turns-ratio using the IEEE C57.12.90 measurement method. The ATRT-03 S2 outputs an excitation test voltage to the transformer’s primary windings. The induced secondary voltage is sensed and the transformer turns-ratio is calculated. The unit can measure turns-ratios from 0.8 to 15,000. The transformer turns-ratio, excitation current, and phase-angle readings are displayed on the large back-lit LCD. The built-in transformer type detection feature allows the ATRT-03 S2 to detect and test 130 transformer types defined by ANSI, CEI/IEC and Australian standards.

The ATRT-03 S2 can be used as a stand-alone unit or can be computer-controlled. It can be operated locally using its alpha-numeric keypad and rotary switch. Information is displayed on a back-lit LCD screen (64 x 128 dot graphic) that is viewable in both bright sunlight and low-light levels. Test reports can be printed in the field on the unit’s built-in 4.5-inch wide thermal printer (ATRT-03 S2 and ATRT-03A S2 only). The ATRT-03 S2 can store up to 112 test records and 128 test plans in Flash EEPROM. Test records or test plans can be stored or transferred to and from a PC via the available interfaces (RS-232C port, USB port, USB Flash drive port).

Transformer Test Voltage

To prevent an accidental wrong test-lead hook-up (e.g., when the operator reverses H and X leads), the ATRT-03 S2 outputs a low-level test voltage to verify the hook-up condition before applying the full test voltage to the transformer. Three test voltages (8 Vac, 40 Vac, 100 Vac) allow the ATRT-03 S2 to test CT’s and PT’s, as well as power transformers.

Auto-Detect Transformer Configuration

The ATRT-03 S2 can automatically detect 130 specific vector groups for different transformer types defined by ANSI, CEI/IEC, and Australian standards.

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User Interface

The ATRT-03 S2 features a back-lit LCD screen (64 x 128 dot graphic) that is viewable in both bright sunlight and low-light levels. The test results screen displays the transformer turns-ratio, excitation current, phase angle, and percentage error. The unit is controlled via a rugged, 16key, membrane keypad and a digital rotary switch.

Transformer Test Plans

The ATRT-03 S2 can store up to 128 transformer test plans in its Flash EEPROM. A test plan is comprised of the transformer nameplate voltages for each tap setting. The calculated turnsratio based on the nameplate voltages is compared with the measured turns-ratio. By recalling a test plan, a transformer can be quickly tested and turns-ratio Pass/Fail reports can be reviewed. Test plans can be created with the PC software and can be transferred to the ATRT03 S2 via the available interfaces (RS-232C port, USB port, USB Flash drive port).

Internal Test Record Storage

Up to 112 test records can be stored in the ATRT-03 S2’s Flash EEPROM memory. Each test record may contain up to 33 turns-ratio, excitation current, phase angle and name plate voltage readings. Test records can be recalled locally or transferred to a PC via the available interfaces (RS-232C port, USB port, USB Flash drive port).

USB Flash Drive Interface

A built-in USB Flash drive interface provides a convenient method for transferring test plans and test records to or from a USB Flash drive. The user can store up to 999 transformer test plans on a USB Flash drive. Test plans can be transferred from a PC to a USB Flash drive, and then a specific test plan on the USB Flash drive can be transferred to the ATRT-03 S2’s internal Flash memory. Up to 999 test records from the field can be stored on a USB Flash drive. Test records stored in the ATRT-03 S2’s internal memory can also be transferred to a USB Flash drive. The supplied PC software can then be used to view the test records stored on the USB Flash drive.

Computer Interface

In computer-controlled mode, the unit can be controlled via the RS-232C or USB port using the supplied PC software (Transformer Turns-Ratio Analyzer application provided with each ATRT03 S2). This Windows® XP/Vista-based software can be used to run a test and to store test results on a PC. Test results can also be exported to Microsoft® Excel.

Transformer Load Tap Changer Control

Transformer tap positions can be changed remotely using the unit’s built-in transformer load tap changer. This remote-controlled tap changer feature eliminates the need to manually change a transformer’s step-up and step-down taps.

Built-in Thermal Printer (ATRT-03 S2 and ATRT-03A S2 only)

The ATRT-03 S2 and ATRT-03A S2 feature a built-in 4.5-inch wide thermal printer that can print test results. The printer and paper dispenser are mounted under the front panel for protection.

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1.2Technical Specifications

1.2.1. ATRT-03 S2 Technical Specifications

Table 1. ATRT-03 S2 Technical Specifications

TYPE	Portable, lightweight, automatic, 3-phase transformer turns-ratio meter
PHYSICAL SPECIFICATIONS	18”W x 7”H x 15”D (45.7 cm x 17.8 cm x 38.1 cm); Weight: 20 lbs (9.0 kg)
OPERATING VOLTAGE	100 – 240 Vac, 50/60 Hz
MEASUREMENT METHOD	ANSI/IEEE C57.12.90
TURNS-RATIO MEASURING	0.8 – 15,000
RANGE
TURNS-RATIO ACCURACY	0.8 – 1,999: ±0.1%, 2,000 – 3,999: ±0.25%. 4,000 – 15,000: ±1% @ 8 Vac
	0.8 – 1,999: ±0.1%, 2,000 – 3,999: ±0.20%. 4,000 – 15,000: ±1% @ 40 Vac
	0.8 – 1,999: ±0.1%, 2,000 – 3,999: ±0.15%. 4,000 – 15,000: ±1% @ 100 Vac
TEST VOLTAGES	8 Vac @ 1Amp, 40 Vac @ 0.2 Amp, 100 Vac @ 0.1 Amp
EXCITATION CURRENT	0 – 2 Amperes; Accuracy: ±0.1 mA, ±2% of reading (±1 mA)
READING RANGE
PHASE-ANGLE	0 – 360 Degrees; Accuracy: ±0.2 degree (±1 digit)
MEASUREMENT
DISPLAY	Back-lit LCD screen (64 x 128 dot graphic display); Viewable in bright
	sunlight and low-light levels
PRINTER	Built-in 4.5-inch wide thermal printer
COMPUTER INTERFACES	One RS-232C port, One USB port
EXTERNAL DATA STORAGE	One USB Flash drive interface port; Up to 999 transformer test records can
	be stored on a USB Flash drive (not included).
PC SOFTWARE	Windows® XP/Vista-based Transformer Turns-Ratio Analyzer application is
	included with purchase price
INTERNAL TEST RECORD	Can store 112 transformer test records internally. Each record holds the test
STORAGE	record header and up to 33 readings per phase. The readings include turns
	ratio readings, excitation current readings, and nameplate voltages.
INTERNAL TEST PLAN	Can store 128 transformer test plans internally. Test plans can be transferred
STORAGE	to the unit from the PC via the RS-232C/USB port or via the USB Flash drive
	interface
LOAD TAP CHANGER	240 Vac, 2 Amps
CONTACT
SAFETY	Designed to meet UL 61010A-1 and CAN/CSA C22.2 No. 1010.1-92
	standards
ENVIRONMENT	Operating: -10˚ to 50˚ C (15˚ to +122˚ F); Storage: -30˚ C to 70˚ C (-22˚ to
	+158˚ F)
HUMIDITY (MAX)	90% RH @ 40˚ C (104˚ F) non-condensing
ALTITUDE (MAX)	2000m (6562 ft) to fully safety specifications
CABLES	One 15-foot Single-phase set, One 15-foot 3-phase set, One 25-foot
	extension set, One safety ground, One USB, One RS-232C, One LTC cable,
	cable bag
WARRANTY	One year on parts and labor

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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1.2.2. ATRT-03A S2 Technical Specifications

Table 2. ATRT-03A S2 Technical Specifications

TYPE	Portable, lightweight, automatic, 3-phase transformer turns-ratio meter
PHYSICAL SPECIFICATIONS	20”W x 7.5”H x 15.5”D (50 cm x 19 cm x 39.6 cm); Weight: 27 lbs (12 kg)
OPERATING VOLTAGE	100 – 240 Vac, 50/60 Hz
BATTERIES	Two lead acid batteries (12V, 2 AH) provide up to 3 hours of operation
MEASUREMENT METHOD	ANSI/IEEE C57.12.90
TURNS-RATIO MEASURING	0.8 – 15,000
RANGE
TURNS-RATIO ACCURACY	0.8 – 1,999: ±0.1%, 2,000 – 3,999: ±0.25%. 4,000 – 15,000: ±1% @ 8 Vac
	0.8 – 1,999: ±0.1%, 2,000 – 3,999: ±0.20%. 4,000 – 15,000: ±1% @ 40 Vac
	0.8 – 1,999: ±0.1%, 2,000 – 3,999: ±0.15%. 4,000 – 15,000: ±1% @ 100 Vac
TEST VOLTAGES	8 Vac @ 350 mA, 40 Vac @ 70 mA, 100 Vac @ 20 mA
EXCITATION CURRENT	0 – 2 Amperes; Accuracy: ±0.1 mA, ±2% of reading (±1 mA)
READING RANGE
PHASE-ANGLE	0 – 360 degrees; Accuracy: ±0.2 degree ( ±1 digit)
MEASUREMENT
DISPLAY	Back-lit LCD screen (64 x 128 dot graphic display); Viewable in bright
	sunlight and low-light levels
PRINTER	Built-in 4.5-inch wide thermal printer
COMPUTER INTERFACES	One RS-232C port, One USB port
EXTERNAL DATA STORAGE	One USB Flash drive interface port; Up to 999 transformer test records can
	be stored on a USB Flash drive (not included).
PC SOFTWARE	Windows® XP/Vista-based Transformer Turns-Ratio Analyzer application is
	included with purchase price
INTERNAL TEST RECORD	Can store 112 transformer test records internally. Each record holds the test
STORAGE	record header and up to 33 readings per phase. The readings include turns
	ratio readings, excitation current readings, and nameplate voltages.
INTERNAL TEST PLAN	The unit can store 128 transformer test plans. Test plans can be transferred
STORAGE	to the unit from the PC via the RS-232C/USB port or via the USB Flash drive
	interface
LOAD TAP CHANGER	240 Vac, 1 Amp
CONTACT
SAFETY	Designed to meet UL 61010A-1 and CAN/CSA C22.2 No. 1010.1-92
	standards
ENVIRONMENT	Operating: -10˚ to 50˚ C (15˚ to +122˚ F); Storage: -30˚ C to 70˚ C (-22˚ to
	+158˚ F)
HUMIDITY (MAX)	90% RH @ 40˚ C (104˚ F) non-condensing
ALTITUDE (MAX)	2000m (6562 ft) to fully safety specifications
CABLES	One 15-foot single-phase set, One 15-foot 3-phase set, one 25-foot
	extension set, One safety ground, One USB, One RS-232, One LTC cable,
	cable bag
WARRANTY	One year on parts and labor

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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1.2.3. ATRT-03B S2 Technical Specifications

Table 3. ATRT-03B S2 Technical Specifications

TYPE	Portable, lightweight, automatic, 3-phase transformer turns-ratio meter
PHYSICAL SPECIFICATIONS	18”W x 7”H x 15”D (45.7 cm x 17.8 cm x 38.1 cm ); Weight: 20 lbs (9.0 kg)
OPERATING VOLTAGE	100 – 240 Vac, 50/60 Hz
MEASUREMENT METHOD	ANSI/IEEE C57.12.90
TURNS-RATIO MEASURING	0.8 – 15,000
RANGE
TURNS-RATIO ACCURACY	0.8 – 1,999: ±0.1%, 2,000 – 3,999: ±0.25%. 4,000 – 15,000: ±1% @ 8 Vac
	0.8 – 1,999: ±0.1%, 2,000 – 3,999: ±0.20%. 4,000 – 15,000: ±1% @ 40 Vac
	0.8 – 1,999: ±0.1%, 2,000 – 3,999: ±0.15%. 4,000 – 15,000: ±1% @ 100 Vac
TEST VOLTAGES	8 Vac @ 1Amp, 40 Vac @ 0.2 Amp, 100 Vac @ 0.1 Amp
EXCITATION CURRENT	0 – 2 Amperes; Accuracy: ±0.1 mA, ±2% of reading (±1 mA)
READING RANGE
PHASE-ANGLE	0 – 360 Degrees; Accuracy: ±0.2 degree (±1 digit)
MEASUREMENT
DISPLAY	Back-lit LCD screen (64 x 128 dot graphic display); Viewable in bright
	sunlight and low-light levels
COMPUTER INTERFACES	One RS-232C port, One USB port
EXTERNAL DATA STORAGE	One USB Flash drive interface port; Up to 999 transformer test records can
	be stored on a USB Flash drive (not included).
PC SOFTWARE	Windows® XP/Vista-based Transformer Turns-Ratio Analyzer application is
	included with purchase price
INTERNAL TEST RECORD	Can store 112 transformer test records internally. Each record holds the test
STORAGE	record header and up to 33 readings per phase. The readings include turns
	ratio readings, excitation current readings, and nameplate voltages.
INTERNAL TEST PLAN	Can store 128 transformer test plans internally. Test plans can be transferred
STORAGE	to the unit from the PC via the RS-232C/USB port or via the USB Flash drive
	interface
LOAD TAP CHANGER	240 Vac, 2 Amps
CONTACT
SAFETY	Designed to meet UL 61010A-1 and CAN/CSA C22.2 No. 1010.1-92
	standards
ENVIRONMENT	Operating: -10˚ to 50˚ C (15˚ to +122˚ F); Storage: -30˚ C to 70˚ C (-22˚ to
	+158˚ F)
HUMIDITY (MAX)	90% RH @ 40˚ C (104˚ F) non-condensing
ALTITUDE (MAX)	2000m (6562 ft) to fully safety specifications
CABLES	One 15-foot Single-phase set, One 15-foot 3-phase set, One 25-foot
	extension set, One safety ground, One USB, One RS-232C, One LTC cable,
	cable bag
WARRANTY	One year on parts and labor

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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1.3Controls and Indicators

The ATRT-03 S2, ATRT-03A S2, and ATRT-03B S2 controls and indicators are shown in Figure 1, Figure 2, and Figure 3, respectively. A leader line with an index number points to each control and indicator, which is cross-referenced to a functional description in the corresponding table. The purpose of the controls and indicators may seem obvious, but users should familiarize themselves with them before using the ATRT. Accidental misuse of the controls will usually cause no serious harm. Users should also familiarize themselves with the safety summary information found on the front page of this User’s Manual.

Figure 1. ATRT-03 S2 Controls and Indicators

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Table 4. Functional Descriptions of ATRT-03 S2 Controls and Indicators

	Item		Panel Markings		Functional Description
	Number
	1		EMERGENCY		Emergency turn-off test voltage switch.
			TURN OFF
			“PUSH”
2					Back-lit LCD screen (62 x 128 dot graphic), viewable in bright sunlight
					and low-light levels.
	3		H		H voltage connector.
4			USB		USB Flash drive interface port.
			MEM
	5		X		X voltage connector.
6			LTC		Load Tap Changer controller connector.
			CONTROL
	7				4.5-inch wide thermal printer.
	8		120-240 Vac, 2A, 50-60Hz		Input power connector and fused power switch with third-wire safety
			Fuse: 250Vac, 5A Fast-Blow		ground.
	9		GROUND		Ground stud for connecting to sub-station ground.
	10		CHANGE		Control knob. You can scroll through menu items by turning the
			“PUSH”		control knob. A highlighted menu item can be selected by pushing the
			TO SELECT		control knob.
	11		LTC		Load Tap Changer control buttons.
			CONTROL
12					Rugged alpha-numeric keypad.
	13		TEST		This LED flashes in response to commands or when a test voltage is
			IN		applied to the test transformer.
			PROGRESS
	14		RS-232C		RS-232C PC interface connector.
	15		USB		USB PC interface connector.
			PC

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Figure 2. ATRT-03A S2 Controls and Indicators

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Table 5. Functional Descriptions of ATRT-03A S2 Controls and Indicators

	Item		Panel Markings		Functional Description
	Number
	1		EMERGENCY		Emergency turn off test voltage switch.
			TURN OFF
			“PUSH”
2					Back-lit LCD screen (64 x 128 dot graphic), viewable in bright sunlight
					and low-light levels.
	3		H		H voltage connector.
4			USB		USB Flash drive interface port.
			MEM
	5		X		X voltage connector
6			LTC		Load Tap Changer controller connector.
			CONTROL
	7		POWER		Power switch
	8		120-240 Vac, 2A, 50-60Hz		Input power connector with third-wire safety ground.
			Fuse: 250Vac, 5A Fast-Blow
	9		GROUND		Ground stud for connecting to sub-station ground.
	10		CHARGE		LED is lit when internal batteries are being charged.
	11		+12V		12 VDC input connectors.
			GROUND
12					4.5-inch wide thermal printer.
	13		CHANGE		Control knob. You can scroll through menu items by turning the control
			“PUSH”		knob. A highlighted menu item can be selected by pushing the control
			TO SELECT		knob.
	14		LTC		Load Tap Changer control buttons.
			CONTROL
	15				Rugged alpha-numeric keypad
16			TEST		This LED flashes in response to commands or when a test voltage is
			IN		applied to the test transformer.
			PROGRESS
	17		RS-232C		RS-232C PC interface connector.
	18		USB		USB PC interface connector.
			PC

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ATRT-03 S2, ATRT-03A S2, AND ATRT-03B S2 USER’S MANUAL REV 2

Figure 3. ATRT-03B S2 Controls and Indicators

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Table 6. Functional Descriptions of ATRT-03B S2 Controls and Indicators

	Item		Panel Markings		Functional Description
	Number
	1		EMERGENCY		Emergency turn off test voltage switch.
			TURN-OFF
			“PUSH”
2					Back-lit LCD screen (64 x 128 dot graphic), viewable in bright sunlight
					and low-light levels.
	3		H		H voltage connector.
4			USB		USB Flash drive interface port.
			MEM
	5		X		X voltage connector.
6			LTC		Load Tap Changer controller connector.
			CONTROL
	7		120-240 Vac, 2A, 50-60 Hz		Input power connector and fused power switch with third-wire safety
			Fuse: 250Vac, 5A Fast-Blow		ground.
8			GROUND		Ground stud for connecting to sub-station ground.
	9		CHANGE		Control knob. You can scroll through menu items by turning the control
			“PUSH”		knob. A highlighted menu item can be selected by pushing the control
			TO SELECT		knob.
10			LTC		Load Tap Changer control buttons.
			CONTROL
	11				Rugged alpha-numeric keypad.
12			TEST		This LED flashes in response to commands or when a test voltage is
			IN		applied to the test transformer.
			PROGRESS
	13		RS-232C		RS-232C PC interface connector.
	14		USB		USB PC interface connector.
			PC

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ATRT-03 S2, ATRT-03A S2, AND ATRT-03B S2 USER’S MANUAL REV 2

2.0PRE-TEST SETUP

2.1Operating Voltages

All three ATRT-03 S2 models can be powered by ac line voltage of 100-240 Vac, 50/60 Hz. For greater flexibility, the ATRT-03A S2 features an internal rechargeable lead acid battery and can also be powered by a 12 Vdc external source. The ATRT-03 S2 has built-in ground fault isolation detection and will only operate with voltages that are ground-fault isolated.

2.2LCD Screen Contrast Control

To increase the LCD screen contrast, press and hold the [PAPER Contrast] 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 [PAPER Contrast] key for two seconds. Release the button when the desired contrast level has been reached.

2.3Printer Paper Control

To advance the thermal printer paper, press and release the [PAPER Contrast] key.

To retract the thermal printer paper, press and release the [PAPER Contrast] key.

2.4Printer Paper

The ATRT-03 S2 and ATRT-03A S2’s built-in thermal printers use 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: [phone]

Fax: [phone]

Part Number: VIC TP-4 paper

BG Instrument Co.

13607 E. Trent Avenue Spokane, WA 99216 Tel: [phone] Fax: [phone]

Part Number: VIC TP-4 paper

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2.5Replacing the Load Tap Changer Controller Fuses

The ATRT-03 S2 features a built-in Load Tap Changer (LTC) controller that can raise or lower the LTC tap position from the front panel. The LTC controller circuit uses two 250 Vac/2A, NO, relay contacts to simulate the LTC Raise/Lower switches. Each relay contact is protected by a 1A/250 Vac fuse (5 X 20mm, fast acting). The fuse should be replaced with a Littlefuse P/N 217001 or equivalent. Follow the instructions below to replace the LTC controller fuses:

a.Remove the ATRT-03 S2 from its casing by removing the four screws from the bottom of the case:

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ATRT-03 S2, ATRT-03A S2, AND ATRT-03B S2 USER’S MANUAL REV 2

b.The LTC control board is located under the left side of the front panel as shown in the figure below. Flip the unit over to easily access the LTC control board fuses.

c.Replace any fuses as necessary with Littlefuse P/N 217001 or equivalent (250 Vac/1A, 5 X 20mm fast-acting type).

d.Re-secure the unit in its casing with the screws that were removed in step a.

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3.0OPERATING PROCEDURES

The ATRT-03 S2 should always be grounded with the provided ground cable before connecting H and X cables. The transformer bushings should also be grounded before connecting test leads to the transformer. This will prevent inducing any voltages into the ATRT-03 S2. All transformer bus connections must be removed, and the transformer must be isolated before performing any tests. Typical transformer connection diagrams are illustrated in the sections below.

3.1Connection Diagrams

3.1.1. Typical Front Panel Connections

Figure 4. Typical Front Panel Cable Connections

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ATRT-03 S2, ATRT-03A S2, AND ATRT-03B S2 USER’S MANUAL REV 2

3.1.2.Typical Connections to a Load Tap Changer (LTC)

Figure 5. Typical Connections to a Load Tap Changer (LTC)

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3.1.3.Typical Connections to a Delta-Wye Transformer

Figure 6. Typical H & X Cable Connections to a Delta-Wye Transformer

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3.1.4.Typical Connections to a Single Phase Transformer

Figure 7. Typical Connections to a Single Phase Transformer

Figure 8. Typical Connections to a Single Phase Auto Transformer

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3.1.5.Typical Connections to a Voltage Regulator

Figure 9. Typical Connections to a Type A Voltage Regulator

Figure 10. Typical Connections to a Type B Voltage Regulator

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ATRT-03 S2, ATRT-03A S2, AND ATRT-03B S2 USER’S MANUAL REV 2

3.1.6. Typical Connections to a Donut Type (un-mounted) Current Transformer

Figure 11. Typical Connections to a Donut Type (un-mounted) Current Transformer (CT)

The H and X test leads are reversed for the CT ratio test connections shown above.

NOTE

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3.1.7. Typical Connections to a Multi-Tap Current Transformer

Figure 12. Typical Connections to a Multi-Tap Current Transformer

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3.1.8.Typical Connections to a Bushing Mount CT on a Single Phase Transformer

Figure 13. Typical Connections to a Bushing Mount CT on a Single Phase Transformer

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3.1.9. Typical Connections to Bushing Mount CT’s on Delta Transformer

Figure 14. Typical Connections to Bushing Mount CT's on Delta Transformer

The CT turns-ratio is obtained by performing a Ynd11 test.

NOTE

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ATRT-03 S2, ATRT-03A S2, AND ATRT-03B S2 USER’S MANUAL REV 2

3.1.10. Typical Connections to Bushing Mount CT’s on Wye Transformer

Figure 15. Typical Connections to Bushing Mount CT's on Wye Transformer

The CT turns-ratio is obtained by performing a Ynyn0 test.

NOTE

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