Vanguard ATRT-01-01B S3 User Manual
ATRT-01 S3 and ATRT-01B S3
SINGLE PHASE TRANSFORMER TURNS-RATIO METERS
USER’S MANUAL
Vanguard Instruments Company, Inc.
1520 S. Hellman Ave.
Ontario, California 91761, USA
TEL: (909) 923-9390
FAX: (909) 923-9391
May 2011
Revision 1
ATRT-01/01B S3 USER’S MANUAL REV 1
SAFETY SUMMARY
This manual applies to both the ATRT-01 S3 and ATRT-01B S3 current transformer turns-ratio
meters. The operating procedures are virtually the same for both 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 S3, 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 S3.
SAFETY WARNINGS AND CAUTIONS
The ATRT-01/01B S3 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 S3 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 S3 Technical Specifications ........................................................................ 4
1.2.2. ATRT-01B S3 Technical Specifications ...................................................................... 5
1.2.3. Controls and Indicators ............................................................................................ 6
2.0 PRE-TEST SETUP ................................................................................................................... 9
2.1 ATRT-01 S3 Operating Voltage ......................................................................................... 9
2.2 ATRT-01B S3 Operating Power ........................................................................................ 9
2.3 LCD Screen Contrast Control ............................................................................................ 9
3.0 OPERATING PROCEDURES ................................................................................................. 10
3.1 ATRT Transformer Connection Diagrams ...................................................................... 10
3.2 Setting the Test Voltage ................................................................................................. 14
3.3 Setting the Date and Time ............................................................................................. 16
3.4 Setting the Interface Language ...................................................................................... 17
3.5 Setting the Frequency (ATRT-01B S3 Only) .................................................................... 18
3.6 Performing Tests ............................................................................................................ 19
3.6.1. Entering Test Record Header Information ............................................................. 19
3.6.2. Testing a Single Phase Transformer ....................................................................... 23
3.6.3. Testing a Three Phase Transformer ....................................................................... 28
3.7 Working With Test Records ........................................................................................... 35
3.7.1. Viewing the Contents of the Working Memory ..................................................... 35
3.7.2. Saving Test Results to a Test Record ...................................................................... 36
3.7.3. Restoring a Test Record From Flash EEPROM ........................................................ 38
3.7.4. Restoring a Test Record From a USB Flash Drive ................................................... 42
3.7.5. Copying Test Records to a USB Flash Drive ............................................................ 45
3.7.6. Viewing the Test Record Directory ......................................................................... 48
3.7.7. Erasing Test Records from the Flash EEPROM ....................................................... 50
3.7.8. Erasing Test Records from a USB Flash Drive ......................................................... 55
3.8 Using the Turns Ratio Calculator ................................................................................... 58
APPENDIX A – TRANSFORMER VECTOR GROUP CODES ............................................................... 61
APPENDIX B – Common ANSI Transformer Descriptions ............................................................. 62
APPENDIX C – CEI/IEC 60076-1 Transformer Descriptions ........................................................... 70
APPENDIX D – Australian Std.2374 Transformer Descriptions ..................................................... 77
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ATRT-01/01B S3 USER’S MANUAL REV 1
LIST OF TABLES
Table 1. ATRT-01 S3 Technical Specifications ................................................................................. 4
Table 2. ATRT-01B S3 Technical Specifications ............................................................................... 5
Table 3. Functional Descriptions of ATRT-01 S3 Controls and Indicators ...................................... 7
Table 4. Functional Descriptions of ATRT-01B S3 Controls and Indicators .................................... 8
LIST OF FIGURES
Figure 1. ATRT-01 S3 Controls and Indicators ................................................................................ 7
Figure 2. ATRT-01B S3 Controls and Indicators .............................................................................. 8
Figure 3. Typical Single-Phase Transformer Connection .............................................................. 10
Figure 4. Typical Auto Transformer Connection ........................................................................... 11
Figure 5. Typical CT Connection .................................................................................................... 12
Figure 6. Typical Bushing CT Connection on a Single Transformer .............................................. 13
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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 the ATRT-01 S3 and ATRT-01B S3.
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:
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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ATRT-01/01B S3 USER’S MANUAL REV 1
1.0 INTRODUCTION
1.1 General Description and Features
The ATRT-01 S3 is Vanguard’s fourth generation, micro-processor based, single phase,
automatic transformer turns-ratio tester. This portable test unit is available in two models, the
ATRT-01 S3 (line power only), and the ATRT-01B S3 (rechargeable-battery powered).
The ATRT-01 S3 uses the IEEE C57.12.90 measuring method to determine the transformer
turns-ratio. The transformer turns-ratio is determined by precisely measuring the voltages
across the unloaded transformer windings. The ATRT-01 S3’s measuring circuitry self adjusts
before each measurement to ensure turns-ratio accuracy. Two selectable test voltages, 4Vac
and 40Vac, offer flexibility in testing different types of transformers.
The ATR-01 S3 can measure turns-ratios ranging from 0.8 to 15,000 and can be used to test
voltage regulators, power transformers, current transformers (CT), and potential transformers
(PT). The ATRT-01 S3 also measures and displays transformer-winding excitation current,
winding polarity, and winding phase angle. Test results are displayed on a back-lit LCD screen
(128 x 64 pixels) that is viewable in bright sunlight and low-light conditions.
In addition to measuring a transformer’s turns-ratio, the transformer’s name plate voltages can
also be entered, and the ATRT-01 S3 will then display the turns-ratio percentage error. This
convenient feature eliminates any user-calculation errors when testing transformers.
When testing a 3-phase transformer, the ATRT-01 S3 provides connection information (H and X
test leads to the transformer bushings) for phase A, B and C tests. The three phase test results
(turns-ratio, excitation current, winding polarity, phase-angle, and percentage error) are
displayed on the LCD screen.
User Interface
The ATRT-01 S3 features a back-lit LCD screen (128 x 64 pixels) that is viewable in direct sunlight
and low-light levels. A rugged 16-key membrane keypad is used to enter test information and to
operate the unit.
Test Record Storage
The ATRT-01 S3 can store 128 records of 33 readings internally, and up to 999 test records on
an external USB Flash drive. Test records can be recalled using the included Transformer
Analysis PC software.
Computer Interface
A Windows®-based (XP/Vista/7) Transformer Analysis Software is provided with each unit and
can be used to remotely control the ATRT-01 S3 via the RS-232C port. Using the Transformer
Analysis software, the user can retrieve test records (from the ATRT-01 S3’s memory or a USB
Flash drive), analyze test results, and print test results on a desktop printer. Test results are
automatically exported to PDF, Excel, and XML formats.
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Battery Power for Exceptional Portability
The ATRT-01B S3 is powered by a 6-volt, 7 ampere-hour, lead acid battery. This high capacity
battery, coupled with the ATRT-01B S3’s low power consuming circuitry, allows the unit to be
used continuously for up to 4 hours per charge. A built-in charger allows the unit to be used
during charging.
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ATRT-01/01B S3 USER’S MANUAL REV 1
1.2 Technical Specifications
1.2.1. ATRT-01 S3 Technical Specifications
Table 1. ATRT-01 S3 Technical Specifications
TYPE Transformer Turns Ratio Tester
PHYSICAL SPECIFICATIONS Dimensions: 12” x 10” x 8” (30.4 cm x 25.4 cm x 20.3 cm)
Weight: 8 lbs (3.6 Kg)
INPUT POWER 120 or 240 Vac (Selectable), 50/60 Hz
MEASURING METHOD ANSI/IEEE C57.12.90
RATIO MEASURING RANGE 0.8 - 15,000 (5 digit resolution)
TURNS-RATIO ACCURACY 40 Vac: 0.8-1,999 (0.1%), 2,000-3,999 (0.25%), 4,000-15,000 (1%)
4 Vac: 0.8-1,999 (0.1%), 2,000-3,999 (0.25%), 4,000-15,000 (2%)
TEST VOLTAGE 4 Vac @ 1.0A, 40 Vac @ 0.6A
PHASE ANGLE
MEASUREMENT
POLARITY READING In-Phase or Out-of-Phase indication
EXCITATION CURRENT
READING RANGE
DISPLAY Back-lit LCD (128 x 64 pixels), viewable in direct sunlight and lo w light levels
COMPUTER INTERFACE RS-232C
PC SOFTWARE Windows XP/Vista/7 Transformer Analysis Software (included with purchase)
INTERNAL TEST RECORD
STORAGE
EXTERNAL TEST RECORD
STORAGE
SAFETY Designed to meet IEC 61010 (1995), UL 61010A-1, and CSA-C22.2
ENVIRONMENT Operating: -10ºC to 50ºC (15ºF to +122ºF)
HUMIDITY (MAX) 90% RH @ 40˚ C (104˚ F) non-condensing
ALTITUDE (MAX) 2000m (6562 ft) to full safety specifications
CABLES One 15 ft. (4.6m) Single phase cable, one power cord, one cable bag
OPTIONS Transportation Case (Can hold unit and cables)
WARRANTY One year on parts and labor
0 - 360 degrees, Accuracy ±0.2 degree (±1 digit)
0-2 Amperes, Accuracy: 2% of reading (±1 mA)
128 records of 33 readings
Up to 999 test records on external USB Flash drive.
standards
Storage: (-30ºC to 70ºC (-22ºF to +158ºF)
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 S3 Technical Specifications
Table 2. ATRT-01B S3 Technical Specifications
TYPE Transformer Turns Ratio Tester
PHYSICAL SPECIFICATIONS Dimensions: 12” x 10” x 8” (30.4 cm x 25.4 cm x 20.3 cm)
Weight: 9 lbs (4.3 Kg)
INPUT POWER 90 to 240 Vac, 50/60 Hz
Battery: SLA battery delivering up to 4 hours of continuous operation per
charge.
MEASURING METHOD ANSI/IEEE C57.12.90
RATIO MEASURING RANGE 0.8 - 15,000 (5 digit resolution)
TURNS-RATIO ACCURACY 40 Vac: 0.8-1,999 (0.1%), 2,000-3,999 (0.25%), 4,000-15,000 (1%)
4 Vac: 0.8-1,999 (0.1%), 2,000-3,999 (0.25%), 4,000-15,000 (2%)
TEST VOLTAGE 4 Vac @ 500mA, 40 Vac @ 70mA
PHASE ANGLE
MEASUREMENT
POLARITY READING In-Phase or Out-of-Phase indication
EXCITATION CURRENT
READING RANGE
DISPLAY Back-lit LCD (128 x 64 pixels), viewable in direct sunlight and lo w light levels
COMPUTER INTERFACE RS-232C
PC SOFTWARE Windows XP/Vista/7 Transformer Analysis Software (included with purchase)
INTERNAL TEST RECORD
STORAGE
EXTERNAL TEST RECORD
STORAGE
SAFETY Designed to meet IEC 61010 (1995), UL 61010A-1, and CSA-C22.2
ENVIRONMENT Operating: -10ºC to 50ºC (15ºF to +122ºF)
HUMIDITY (MAX) 90% RH @ 40˚ C (104˚ F) non-condensing
ALTITUDE (MAX) 2000m (6562 ft) to full safety specifications
CABLES One 15 ft. (4.6m) Single phase cable, one power cord, one cable bag
OPTIONS Transportation Case (Can hold unit and cables)
WARRANTY One year on parts and labor
0 - 360 degrees, Accuracy ±0.2 degree (±1 digit)
0-2 Amperes, Accuracy: 2% of reading (±1 mA)
128 records of 33 readings
Up to 999 test records on external USB Flash drive.
standards
Storage: (-30ºC to 70ºC (-22ºF to +158ºF)
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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ATRT-01/01B S3 USER’S MANUAL REV 1
1.2.3. Controls and Indicators
The ATRT-01 S3 and ATRT-01B S3 controls and indicators are shown in Figure 1 and Figure 2,
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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Table 3. Functional Descriptions of ATRT-01 S3 Controls and Indicators
Item
Number
1
2
3
4
5
6
7
Panel Markings Functional Description
120/240 Vac, 2A, 50-60Hz
Fuse: 250Vac, 3A Fast-Blow
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Figure 1. ATRT-01 S3 Controls and Indicators
USB MEM USB Flash drive interface
RS-232C RS-232C computer interface port
H and X lead connector (16-pin male).
Voltage selection switch
Rugged alpha-numeric keypad
Back-lit LCD screen (128 x 64 pixels), viewable in direct sunlight and low
light levels
Input power connector and fused power sw itch w ith third-w ire sa fe ty
ground.
ATRT-01/01B S3 USER’S MANUAL REV 1
Item
Number
1
2
3
4
5
6
7
8
Figure 2. ATRT-01B S3 Controls and Indicators
Table 4. Functional Descriptions of ATRT-01B S3 Controls and Indicators
Panel Markings Functional Description
USB MEM USB Flash drive interface
RS-232C RS-232C computer interface port
H and X lead connector (16-pin male).
120-240 Vac, 2A, 50-60Hz
Fuse: 250Vac, 3A Fast-Blow
Rugged alpha-numeric keypad
CHARGER
POWER Power switch
Back-lit LCD screen (128 x 64 pixels), viewable in bright sunlight and
low light levels
Input power connector
Battery charging indicator. LED lights up when bat tery is being
charged.
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2.0 PRE-TEST SETUP
2.1 ATRT-01 S3 Operating Voltage
The ATRT-01 S3 can be operated from 120 Vac or 240 Vac. The power voltage can be set using
the voltage selector switch on the front panel (see Figure 1, item #5)
2.2 ATRT-01B S3 Operating Power
The ATRT-01B S3 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 S3 into an ac power outlet after the battery is fully charged will
not damage the battery.
• It is recommended that the ATRT-01B S3 be plugged into an ac outlet when it is
NOTES
2.3 LCD Screen Contrast Control
not in use.
• The ATRT-01B S3 uses the Genesis model NP7-6 battery. It can also be replaced
with the Panasonic model LC-R122R2PU battery.
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 S3, 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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ATRT-01/01B S3 USER’S MANUAL REV 1
3.0 OPERATING PROCEDURES
3.1 ATRT Transformer Connection Diagrams
Figure 3. Typical Single-Phase Transformer Connection
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11
Figure 4. Typical Auto Transformer Connection
ATRT-01/01B S3 USER’S MANUAL REV 1
Figure 5. Typical CT Connection
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Figure 6. Typical Bushing CT Connection on a Single Transformer
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ATRT-01/01B S3 USER’S MANUAL REV 1
3.2 Setting the Test Voltage
The ATRT offers two test voltages, 4 Vac and 40 Vac. The unit always defaults to 40 Vac at
power-on. The 4 Vac test voltage can be used in situations where the 40 Vac excitation voltage
may saturate the CT’s. To set the test voltage:
a. Turn on the unit and start from the “ START-UP” menu:
1. TEST TRANSFORMER
2. SETUP
3. CALCULATOR
time: 14:21:34
date: 05/24/11
1. TEST TRANSFORMER
2. SETUP
3. CALCULATOR
bAT:
time: 14:21:34
date: 05/24/11
ATRT-01 S3 “START-UP” menu ATRT-01B S3 “START-UP” menu
Press the [2] key (SETUP).
b. The following screen will be displayed:
1. RECORD ID
2. TEST VOLTAGE
3. PRINT RECORD
4. SAVE/RESTORE RECORD
5. SET TIME
6. SET LANGUAGE
1. RECORD ID
2. TEST VOLTAGE
3. PRINT RECORD
4. SAVE/RESTORE RECORD
5. SET TIME
6. SET LANGUAGE
7. SET 50/60 HZ
ATRT-01 S3 ATRT-01B S3
Press the [2] key (TEST VOLTAGE).
c. The following screen will be displayed:
1. 4 Volts
2. 40 VOLTS
Press the [1] key (4 VOLTS) to select 4 volts as the test voltage or press the [2] key (40
VOLTS) to select 40 volts as the test voltage.
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d. The voltage will be set and the following confirmation message will be displayed:
40 VOLTS SET
Press any key to return to the “START-UP” menu.
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3.3 Setting the Date and Time
To set the date and time:
a. Start from the “START-UP” menu:
1. TEST TRANSFORMER
2. SETUP
3. CALCULATOR
time: 14:21:34
date: 05/24/11
Press the [2] key (SETUP).
b. The following screen will be displayed:
1. RECORD ID
2. TEST VOLTAGE
3. PRINT RECORD
4. SAVE/RESTORE RECORD
5. SET TIME
6. SET LANGUAGE
ATRT-01/01B S3 USER’S MANUAL REV 1
Press the [5] key (SET TIME)
c. The following screen will be displayed:
ENTER DATE
MM-DD-YY
Type in the date using the alpha-numeric keypad. The following screen will be displayed:
ENTER TIME
HH:MM:SS
Enter the time using the alpha-numeric keypad. When the time has been entered, you
will be immediately returned to the “START-UP” menu.
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3.4 Setting the Interface Language
Follow the steps below to set the interface language (English, Spanish, or Turkish):
a. Start from the “START-UP” menu:
1. TEST TRANSFORMER
2. SETUP
3. CALCULATOR
time: 14:21:34
date: 05/24/11
Press the [2] key (SETUP).
b. The following screen will be displayed:
1. RECORD ID
2. TEST VOLTAGE
3. PRINT RECORD
4. SAVE/RESTORE RECORD
5. SET TIME
6. SET LANGUAGE
Press the [6] key (SET LANGUAGE).
c. The following screen will be displayed:
1. ENGLISH
2. TURKISH
3. SPANISH
Select the preferred interface language by pressing the corresponding key on the
keypad (
[1], [2], or [3]). The interface language will be set and a confirmation screen
will be displayed as shown below:
ENGLISH SET
Press any key to return to the “START-UP” menu.
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ATRT-01/01B S3 USER’S MANUAL REV 1
3.5 Setting the Frequency (ATRT-01B S3 Only)
Follow the steps below to set the preferred frequency (50 or 60 Hz):
a. Start from the “START-UP” menu:
1. TEST TRANSFORMER
2. SETUP
3. CALCULATOR
bAT:
time: 14:21:34
date: 05/24/11
Press the [2] key (SETUP).
b. The following screen will be displayed:
1. RECORD ID
2. TEST VOLTAGE
3. PRINT RECORD
4. SAVE/RESTORE RECORD
5. SET TIME
6. SET LANGUAGE
7. SET 50/60 HZ
Press the [7] key (SET 50/60 HZ).
c. The following screen will be displayed:
1. 60 Hz
2. 50 hz
Select the preferred frequency by pressing the corresponding key on the keypad (
[2]). The frequency will be set and a confirmation screen will be displayed as shown
below:
60 hz set
[1] or
Press any key to return to the “START-UP” menu.
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3.6 Performing Tests
3.6.1. 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, manufacturer, etc. Once
the header information has been set, it will apply to all subsequent test records. Follow the
steps below to enter the test header information:
a. Start from the “START-UP” menu:
1. TEST TRANSFORMER
2. SETUP
3. CALCULATOR
time: 14:21:34
date: 05/24/11
Press the [2] key (SETUP).
b. The following screen will be displayed:
1. RECORD ID
2. TEST VOLTAGE
3. PRINT RECORD
4. SAVE/RESTORE RECORD
5. SET TIME
6. SET LANGUAGE
Press the [1] key (RECORD ID).
c. The following screen will be displayed:
COMPANY:
_
↑/↓ TO POSITION
"ENTER" TO ACCEPT
Type the company name using the alpha-numeric keypad.
When pressing a key, the corresponding number on the key will be displayed first.
Pressing the key again will display the first letter on the key. Pressing the key again will
display the second letter on the key. For example, to type the letter “A”, you must press
[2] key twice. To erase the character at the cursor position, press the [CLEAR] key.
the
Press the
[Contrast ∧] key to move to the next character. Press the [Contrast ∨]
key to move to the previous character. Press the [ENTER] key when you are done
typing the company name.
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d. The following screen will be displayed:
STATION:
_
↑/↓ TO POSITION
"ENTER" TO ACCEPT
Type the station name using the alpha-numeric keypad and then press the [ENTER]
key.
e. The following screen will be displayed:
CIRCUIT:
_
↑/↓ TO POSITION
"ENTER" TO ACCEPT
ATRT-01/01B S3 USER’S MANUAL REV 1
Type the circuit information using the alpha-numeric keypad and then press the
[ENTER] key.
f. The following screen will be displayed:
MANUFACTURER:
_
↑/↓ TO POSITION
"ENTER" TO ACCEPT
Type the manufacturer name using the alpha-numeric keypad and then press the
[ENTER] key.
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g. The following screen will be displayed:
MODEL:
_
↑/↓ TO POSITION
"ENTER" TO ACCEPT
Type the transformer’s model information using the alpha-numeric keypad and then
press the [ENTER] key.
h. The following screen will be displayed:
SERIAL NUMBER:
_
↑/↓ TO POSITION
"ENTER" TO ACCEPT
Type the transformer’s serial number using the alpha-numeric keypad and then press
the [ENTER] key.
i. The following screen will be displayed:
KVA RATING:
_
↑/↓ TO POSITION
"ENTER" TO ACCEPT
Type the transformer’s KVA rating using the alpha-numeric keypad and then press the
[ENTER] key.
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j. The following screen will be displayed:
OPERATOR:
_
↑/↓ TO POSITION
"ENTER" TO ACCEPT
Type the operator’s name using the alpha-numeric keypad and then press the [ENTER]
key. All header information will be saved, and you will be returned to the “START-UP”
menu.
ATRT-01/01B S3 USER’S MANUAL REV 1
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3.6.2. Testing a Single Phase Transformer
Follow the steps below to test a single phase transformer:
a. Start from the “START-UP” menu:
1. TEST TRANSFORMER
2. SETUP
3. CALCULATOR
time: 14:21:34
date: 05/24/11
Press the [1] key (TEST TRANSFORMER).
b. The following screen will be displayed:
XFMR CONFIG:
1. SINGLE PHASE
2. Dy
3. YD
4. DD
5. YY
6. NEXT PAGE
Press the [1] key (SINGLE PHASE).
c. The following screen will be displayed:
NAME PLATE VOLTAGE?
1. yes
2. no
3. use prev data
Option 3 (USE PREV DATA) will be listed only if you had provided name plate
voltages for a previous test.
NOTE
1. YES
Press the [1] key (YES) if you would like to enter the transformer name plate
voltage values. The following screen will be displayed:
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