Vanguard ATRT-01 S2 User Manual

ATRT-01 S2, ATRT-01B S2, and ATRT-01D S2

SINGLE PHASE TRANSFORMER TURNS-RATIO METERS

USER’S MANUAL

Vanguard Instruments Company, Inc.

1520 S. Hellman Ave.

Ontario, California 91761, USA

TEL: [phone]	July 2010
FAX: [phone]	Revision 2

ATRT-01 S2, ATRT-01B S2, AND ATRT-01D S2 USER’S MANUAL REV 2

SAFETY SUMMARY

This manual applies to the ATRT-01 S2, ATRT-01B S2, and ATRT-1D 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-01/01B/01D 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-01/01B/01D S2.

SAFETY WARNINGS AND CAUTIONS

The ATRT-01/01B/01D S2 shall be used only by trained operators. All transformers under test shall be off-line and fully isolated. 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-01/01B/01D 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-01 S2 Technical Specifications ........................................................................		4
1.2.2. ATRT-01B S2 Technical Specifications ......................................................................		5
1.2.3. ATRT-01D S2 Technical Specifications......................................................................		6
1.3	Controls and Indicators....................................................................................................	7
2.0	PRE-TEST SETUP .................................................................................................................	11
2.1	ATRT-01 S2 Operating Voltages .....................................................................................	11
2.2	ATRT-01B S2 Operating Power ......................................................................................	13
2.3	ATRT-01D S2 Operating Power ......................................................................................	13
2.4	LCD Screen Contrast Control..........................................................................................	13
3.0	OPERATING PROCEDURES .................................................................................................	14
3.1	ATRT Transformer Connection Diagrams ......................................................................	14
3.2	Setting the Test Voltage.................................................................................................	18
3.3	Enabling the Computer Interface ..................................................................................	19
3.4	Setting the Date and Time .............................................................................................	20
3.5	Performing Tests............................................................................................................	21
3.5.1. Testing a Single Phase Transformer .......................................................................		21
3.5.2. Testing a Three Phase Transformer .......................................................................		24
3.5.3. Performing a Quick Test .........................................................................................		28
APPENDIX A – TRANSFORMER VECTOR GROUP CODES ...............................................................		32
APPENDIX B – Common ANSI Transformer Descriptions .............................................................		33
APPENDIX C – CEI/IEC 60076-1 Transformer Descriptions ...........................................................		41
APPENDIX D – Australian Std.2374 Transformer Descriptions.....................................................		48

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	LIST OF TABLES
Table 1. ATRT-01 S2 Technical Specifications .................................................................................		4
Table 2. ATRT-01B S2 Technical Specifications...............................................................................		5
Table 3. ATRT-01D S2 Technical Specifications ..............................................................................		6
Table 4.	Functional Descriptions of ATRT-01 S2 Controls and Indicators ......................................	8
Table 5.	Functional Descriptions of ATRT-01B S2 Controls and Indicators ....................................	9
Table 6.	Functional Descriptions of ATRT-01D S2 Controls and Indicators ..................................	10
Table 7.	ATRT-01 S2 Voltage Selection Jumper Settings ..............................................................	11
Table 8. Pre-programmed Nameplate Voltages ...........................................................................		31

		LIST OF FIGURES
Figure 1. ATRT-01 S2		Controls and Indicators ................................................................................	8
Figure 2. ATRT-01B S2 Controls and Indicators ..............................................................................			9
Figure 3. ATRT-01D S2 Controls and Indicators ............................................................................			10
Figure 4.	ATRT-01 S2	Voltage Selection Jumper Location ............................................................	11
Figure 5. ATRT-01 S2		100 – 120 Vac Jumper Settings...................................................................	12
Figure 6. ATRT-01 S2		200 – 240 Vac Jumper Settings...................................................................	12
Figure 7.	Typical Single-Phase Transformer Connection ..............................................................		14
Figure 8.	Typical Auto Transformer Connection...........................................................................		15
Figure 9.	Typical CT Connection....................................................................................................		16
Figure 10. Typical Bushing CT Connection on a Single Transformer ............................................			17
Figure 11. Test Results Elements ..................................................................................................			30

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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-01 S2 models (ATRT-01 S2, ATRT-01B S2, and ATRT-1D S2).

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

•Menu names are referenced as “MENU NAME”

•ATRT screen output is shown as:

TEXT LINE 1

TEXT LINE 2

TEXT LINE 3

TEXT LINE 4

•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-01 S2 is Vanguard’s third-generation micro-processor-based, single-phase, automatic, transformer-turns-ratio tester. This portable test equipment is offered in three models: the ATRT-01 S2, ATRT-01B S2, and ATRT-01D S2. The ATRT-01 S2 is ac-line powered; the ATRT-01B S2 is ac-line or rechargeable-battery powered, and the ATRT-01D S2 is powered by six D-cells.

The ATRT-01 S2 determines the transformer turns-ratio using the IEEE C57.12.90 measurement method. The transformer turns-ratio is determined by precisely measuring the voltages across the unloaded transformer windings. The ATRT-01 S2’s measuring circuitry self calibrates before each measurement to ensure turns-ratio accuracy.

The ATRT-01 S2 measures turns-ratios ranging from 0.800 to 15,000 and can be used to test voltage regulators, power transformers, current transformers (CT), and Potential Transformers (PT). The ATRT-01 S2 also measures and displays transformer-winding excitation current, and winding polarity. Test results are displayed on a back-lit LCD screen (4 lines by 20 characters).

In addition to measuring a transformer’s turns-ratio, nameplate voltages can also be entered via the keypad, and the ATRT-01 S2 will then display the turns-ratio error as a percentage. This convenient feature eliminates any user-calculation error when testing transformers.

If a 3-phase transformer is being tested, the ATRT-01 S2 will also provide connection information (H and X test probes to transformer bushings) for phases A, B, and C tests. Threephase test results (turns-ratio, excitation current, winding polarity, and percentage error) are displayed on the LCD screen at the end of each test.

User Interface

The ATRT-01 S2 features a back-lit LCD screen (4 lines by 20 characters) that is viewable in both bright sunlight and low-light levels. Displayed test results include turns-ratio, winding polarity, excitation current, and percentage error calculation.

The ATRT-01 S2’s rugged, 16-key membrane keypad is used to select a test and enter the nameplate voltages for turns-ratio percentage error calculation.

Computer Interface

The ATRT-01 S2, ATRT-01B S2 and the ATRT-01D S2 can be used with a PC via the RS-232C interface. Windows® XP/Vista-based software is provided with each unit and can be used to test transformers and to store the test results on the computer. The test results can be retrieved later, in the office for example, for analysis and for printing on an office printer. The test results can also be exported in text or Microsoft® Excel format, thus allowing the results to be used with other PC applications.

The included PC software can also be used to create test plans for specific transformers. A test plan is comprised of the transformer nameplate voltages for each tap setting. Computed turnsratio is based on the nameplate voltages which can be compared to the measured ratio to derive percentage error.

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Battery Power for Exceptional Portability

The ATRT-01B S2 is powered by a 6-Volt, 7 Ampere-hour, lead-acid battery. The high capacity battery, coupled with the ATRT-01B S2’s low power consuming circuitry, allows the unit to be used continuously for up to 6 hours between re-charges. A built-in charger lets the unit be used while the battery is being charged.

The ATRT-01D S2 uses 6 D-cell batteries. Up to 250 tests can be performed with one set of D- cell batteries.

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1.2Technical Specifications

1.2.1. ATRT-01 S2 Technical Specifications

Table 1. ATRT-01 S2 Technical Specifications

TYPE	Portable, automatic, single-phase transformer turns ratio meter
INPUT POWER	120 or 240Vac (Selectable), 50/60Hz (See section 2.1)
MEASUREMENT METHOD	ANSI/IEEE C57.12.90
RATIO MEASURING RANGE	0.8 – 15,000 (5-digit resolution)
TURNS-RATIO ACCURACY	0.800 – 1,999 (±0.1%),
	2,000 – 3,999 (±0.25%),
	4,000 – 15,000 (±1%)
TEST VOLTAGES	8 Vac @ 1.0 Amp, 40 Vac @ 0.6 Amp
EXCITATION READING	0 – 2 Amperes
RANGE
CURRENT READING	±1 milli-amp, ±2% of reading (±1-digit)
ACCURACY
DISPLAY	Back-lit LCD screen (4 lines by 20 characters), viewable in bright sunlight and
	low-light levels
COMPUTER INTERFACE	One RS-232C (19,200 baud) port
PC SOFTWARE	Windows® XP/Vista-based, included with purchase price
SAFETY	Designed to meet IEC61010 (1995), UL61010A-1, CSA-C22.2 standards
ENVIRONMENT	Operating: -10˚C to 50˚C (15˚F to 122˚F); Storage: -30˚ C to 70˚C (-22˚F 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 cable, one cable-carrying duffel bag included
OPTIONS	Transportation case
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-01B S2 Technical Specifications

Table 2. ATRT-01B S2 Technical Specifications

TYPE	Portable, automatic, single-phase transformer turns ratio meter
INPUT POWER	SLA battery (90–240Vac, 50/60Hz). Delivers up to 6-hours of operation.
MEASUREMENT METHOD	ANSI/IEEE C57.12.90
RATIO MEASURING RANGE	0.8 – 15,000 (5-digit resolution)
TURNS-RATIO ACCURACY	0.800–1,999 (±0.1%),
	2,000–3,999 (±0.25%),
	4,000–15,000 (±1.5%)
TEST VOLTAGES	8 Vac @ 350 mA, 40 Vac @ 70 mA
EXCITATION READING	0 – 2 Amperes
RANGE
CURRENT READING	±1 Milli-amp, ±2% of reading (±1-digit)
ACCURACY
DISPLAY	Back-lit LCD screen (4 lines by 20 characters), viewable in bright sunlight and
	low-light levels
COMPUTER INTERFACE	One RS-232C (19,200 baud) port
PC SOFTWARE	Windows® XP/Vista-based, included with purchase price
SAFETY	Designed to meet IEC61010 (1995), UL61010A-1, CSA-C22.2 standards
ENVIRONMENT	Operating: -10˚C to 50˚C (15˚F to 122˚F); Storage: -30˚ C to 70˚C (-22˚F 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 cable, one cable-carrying duffel bag included
OPTIONS	Transportation case
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-01D S2 Technical Specifications

Table 3. ATRT-01D S2 Technical Specifications

TYPE	Portable, automatic, single-phase transformer turns ratio meter
INPUT POWER	6 D Cells (250-test capacity)
MEASUREMENT METHOD	ANSI/IEEE C57.12.90
RATIO MEASURING RANGE	0.8 – 15,000 (5-digit resolution)
TURNS-RATIO ACCURACY	0.800–1,999 (±0.1%),
	2,000–3,999 (±0.25%),
	4,000–15,000 (±1.5%)
TEST VOLTAGES	8 Vac @ 350 mA, 40 Vac @ 70 mA
EXCITATION READING	0 – 2 Amperes
RANGE
CURRENT READING	±1 Milli-amp, ±2% of reading (±1-digit)
ACCURACY
DISPLAY	Back-lit LCD screen (4 lines by 20 characters), viewable in bright sunlight and
	low-light levels
COMPUTER INTERFACE	One RS-232C (19,200 baud) port
PC SOFTWARE	Windows® XP/Vista-based, included with purchase price
SAFETY	Designed to meet IEC61010 (1995), UL61010A-1, CSA-C22.2 standards
ENVIRONMENT	Operating: -10˚C to 50˚C (15˚F to 122˚F); Storage: -30˚ C to 70˚C (-22˚F 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 cable, one cable-carrying duffel bag included
OPTIONS	Transportation case
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-01 S2, ATRT-01B S2, and ATRT-01D 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.

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Figure 1. ATRT-01 S2 Controls and Indicators

Table 4. Functional Descriptions of ATRT-01 S2 Controls and Indicators

	Item		Panel Markings		Functional Description
	Number
	1		RS-232C		RS-232C computer interface port. Data rate is set to 19,200 baud, 1 start bit, 8
					data bits, 2 stop bits, and no parity bit.
2					Back-lit LCD screen (20 characters by 4 lines), viewable in bright sunlight and
					low-light levels.
	3				Rugged alpha-numeric keypad.
4					H and X lead connector; 16-pin male.
	5		120 Vac, 2A,		Input power connector and fused power switch with third-wire safety ground.
			50-60Hz

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Figure 2. ATRT-01B S2 Controls and Indicators

Table 5. Functional Descriptions of ATRT-01B S2 Controls and Indicators

	Item		Panel Markings		Functional Description
	Number
	1		RS-232C		RS-232C computer interface port. Data rate is set to 19,200 baud, 1 start bit, 8
					data bits, 2 stop bits, and no parity bit.
2					Back-lit LCD screen (20 characters by 4 lines), viewable in bright sunlight and
					low-light levels.
	3				Rugged alpha-numeric keypad.
4					H and X lead connector; 16-pin male.
	5		120 Vac, 2A,		Input power connector and fused power switch with third-wire safety ground.
			50-60Hz
6			POWER		Power switch, momentary contact.
	7		CHARGER		Battery charging indicator. LED lights up when battery is being charged.

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Figure 3. ATRT-01D S2 Controls and Indicators

Table 6. Functional Descriptions of ATRT-01D S2 Controls and Indicators

	Item		Panel Markings		Functional Description
	Number
	1		RS-232C		RS-232C computer interface port. Data rate is set to 19,200 baud, 1 start bit, 8
					data bits, 2 stop bits, and no parity bit.
2					Back-lit LCD screen (20 characters by 4 lines), viewable in bright sunlight and
					low-light levels.
	3				Rugged alpha-numeric keypad.
4					H and X lead connector; 16-pin male.
	5		POWER		Power switch, momentary contact.

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2.0PRE-TEST SETUP

2.1ATRT-01 S2 Operating Voltages

The ATRT-01 S2 is powered by ac line voltage only. The operating voltage is preset at the factory and is selectable between 100-120 Vac, 50/60 Hz or 200-240 Vac, 50/60 Hz. Only the reference transformer requires voltage selection for the different operating voltages. The voltage is set by placing jumper(s) on the transformer (part number 200466-1) as shown in Figure 5 and Figure 6.

Table 7. ATRT-01 S2 Voltage Selection Jumper Settings

	Voltage		Transformer Jumpers
	Selection
	100 – 120 Vac		Pin 1 and 3, Pin 2 and 4
	200 – 240 Vac		Pin 2 and 3

Figure 4. ATRT-01 S2 Voltage Selection Jumper Location

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ATRT-01 S2, ATRT-01B S2, AND ATRT-01D S2 USER’S MANUAL REV 2

Figure 5. ATRT-01 S2 100 – 120 Vac Jumper Settings

Figure 6. ATRT-01 S2 200 – 240 Vac Jumper Settings

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2.2ATRT-01B S2 Operating Power

The ATRT-01B S2 is powered by a rechargeable (6 Vdc / 7 AH) sealed lead acid gel battery. The unit can operate continuously for up to 6 hours between charges. It can also be used while charging. Plugging the ATRT-01B S2 into an ac power outlet after the battery is fully charged will not damage the battery.

•It is recommended that the ATRT-01B S2 be plugged into an ac outlet when it is not in use.

NOTES • The ATRT-01B S2 battery can be replaced with the Panasonic model LC-R122R2PU battery.

2.3ATRT-01D S2 Operating Power

The ATRT-01D S2 is powered by six standard D cell batteries. We recommend industrial (1.5 volts) D cells such as the Duracell 1300.

To turn the unit on or off, press and hold the [POWER] switch for 2 seconds.

2.4LCD Screen Contrast Control

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

For the ATRT-01B S2 and ATRT-01D S2, the back-light turns off after 30 seconds of operation to conserve power. Press any key on the keypad to re-light the back-light.

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3.0OPERATING PROCEDURES

3.1ATRT Transformer Connection Diagrams

Figure 7. Typical Single-Phase Transformer Connection

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