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]
FAX: [phone]

July 2010

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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1.0 INTRODUCTION

1.1 General 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 D­cell batteries.

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®

1.2 Technical 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

RANGE

CURRENT READING

ACCURACY

DISPLAY Back-lit LCD screen (4 lines by 20 characters), viewable in bright sunlight and

COMPUTER INTERFACE One RS-232C (19,200 baud) port

PC SOFTWARE

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

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

0 – 2 Amperes

±1 milli-amp, ±2% of reading (±1-digit)

low-light levels

Windows

158˚F)

XP/Vista-based, included with purchase price

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

RANGE

CURRENT READING

ACCURACY

DISPLAY Back-lit LCD screen (4 lines by 20 characters), viewable in bright sunlight and

COMPUTER INTERFACE One RS-232C (19,200 baud) port

PC SOFTWARE

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

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

0 – 2 Amperes

±1 Milli-amp, ±2% of reading (±1-digit)

low-light levels

Windows

158˚F)

XP/Vista-based, included with purchase price

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

RANGE

CURRENT READING

ACCURACY

DISPLAY Back-lit LCD screen (4 lines by 20 characters), viewable in bright sunlight and

COMPUTER INTERFACE One RS-232C (19,200 baud) port

PC SOFTWARE

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

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

0 – 2 Amperes

±1 Milli-amp, ±2% of reading (±1-digit)

low-light levels

Windows

158˚F)

XP/Vista-based, included with purchase price

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

Item

Number

1

2
3

4
5

Figure 1. ATRT-01 S2 Controls and Indicators

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

Panel Markings Functional Description

RS-232C

Rugged alpha-numeric keypad.
H and X lead connecto r; 16-pin male.

120 Vac, 2A,

50-60Hz

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.

Back-lit LCD screen (20 characters by 4 lines), viewable in bright sunlight and
low-light levels.

Input power connector and fused power sw itch with th ird-w ire safe ty grou nd.

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

Item

Number

1

2
3

4
5
6

7

Panel Markings Functional Description

RS-232C

120 Vac, 2A,

50-60Hz
POWER Power switch, momentary contact.

CHARGER Battery charging indicator. LED lights up when ba tte ry is being ch arged .

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Figure 2. ATRT-01B S2 Controls and Indicators

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.

Rugged alpha-numeric keypad.
H and X lead connecto r; 16-pin male.

Back-lit LCD screen (20 characters by 4 lines), viewable in bright sunlight and
low-light levels.

Input power connector and fused power sw itch with th ird-w ire safe ty grou nd.

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

Item

Number

1

2
3

4
5

Figure 3. ATRT-01D S2 Controls and Indicators

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

Panel Markings Functional Description

RS-232C

Rugged alpha-numeric keypad.
H and X lead connecto r; 16-pin male.

POWER Power sw itch, momentary contact.

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.

Back-lit LCD screen (20 characters by 4 lines), viewable in bright sunlight and
low-light levels.

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2.0 PRE-TEST SETUP

2.1 ATRT-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

Selection

100 – 120 Vac
200 – 240 Vac

Transformer Jumpers

Pin 1 and 3, Pin 2 and 4

Pin 2 and 3

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Figure 4. ATRT-01 S2 Voltage Selection Jumper Location

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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2.2 ATRT-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

NOTES

not in use.

• The ATRT-01B S2 battery can be replaced with the Panasonic model

LC-R122R2PU battery.

2.3 ATRT-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.

2.4 LCD 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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3.0 OPERATING PROCEDURES

3.1 ATRT Transformer Connection Diagrams

Figure 7. Typical Single-Phase Transformer Connection

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