doble Vanguard Instruments WRM-10P S2 User manual

WRM-10P S2
TRANSFORMER WINDING RESISTANCE METER
USER’S MANUAL
1520 S Hellman Avenue, Ontario, CA 91761
TEL: [phone] | FAX: [phone]
www.vanguard-instruments.com
October, 2017
Revision 1.0

WRM-10P S2 USER’S MANUAL REV 1.0
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SAFETY SUMMARY
FOLLOW EXACT OPERATING PROCEDURES
Any deviation from the procedures described in this operator’s manual may create one or more safety hazards,
damage the WRM-10P S2, or cause errors in the test results. Vanguard Instruments assumes no liability for unsafe
or improper use of the WRM-10P S2. The following safety precautions must be observed during all phases of test
set up, test hookups, testing, and test-lead disconnects.
SAFETY WARNINGS AND CAUTIONS
This device must be used only by trained operators. All transformers under test must be off line and fully isolated.
SERVICE AND REPAIR
•Do not install substitute parts or perform any unauthorized modification to any WRM-10P S2 test unit.
•Repairs must be performed only by Vanguard Instruments factory personnel or by an authorized repair service
provider. Unauthorized modifications can cause safety hazards and will void the manufacturer’s warranty.
EQUIPMENT RATINGS
IP Rating: The enclosure for the WRM-10P S2 has an IP rating of 32.
Pollution Rating:The WRM-10P S2 has a pollution rating of 2.
Operating Voltage: The WRM-10P S2 is rated for use with an operating voltage of 120V or 240V, auto-ranging
±10% of selected voltage.
Power Cord: The WRM-10P S2 is supplied with a 16 AWG, 16A power cord with a NEMA 5-15P plug. Replacement
cable must have the same or better rating and is available through the manufacturer.
VENTILATION REQUIREMENTS
The WRM-10P S2 must be operated with the enclosure lid open.
SAFETY SYMBOLS
Indicates that caution should be exercised
OR
Indicates loca
tion of chassis ground terminal
CLEANING
To clean the WRM-10P S2:
•Disconnect all cables and turn the unit off.
•Use a soft, lint-free cloth to wipe all surfaces clean.
•Avoid getting moisture in openings and connectors.
•DO NOT use any cleaning products or compressed air

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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 WRM-10P S2 Technical Specifications............................................................................. 4
1.3 WRM-10P S2 Controls and Indicators.............................................................................. 5
2.0 PRE-TEST SETUP ................................................................................................................... 6
2.1 Operating Voltages .......................................................................................................... 6
2.2 LCD Screen Contrast Control............................................................................................ 6
2.3 Printer Paper Control....................................................................................................... 6
2.4 Printer Paper.................................................................................................................... 6
2.5 Replacing the Thermal Printer Paper............................................................................... 7
3.0 OPERATING PROCEDURES ................................................................................................... 8
3.1 WRM Cable Connections ................................................................................................. 8
3.2 General Procedures ....................................................................................................... 10
3.3 Entering Test Record Header Information..................................................................... 11
3.4 Setting the Clock ............................................................................................................ 14
3.5 Toggling the Calibration Notification Feature ............................................................... 15
3.6 Performing a Resistance Test......................................................................................... 16
3.7 Performing a Load Tap Changer / Voltage Regulator Resistance Test.......................... 25
3.8 Performing a Special Resistance Test ............................................................................ 32
3.9 Performing a Transient Test........................................................................................... 39
3.10 Performing a Diagnostic Test......................................................................................... 44
3.11 Working with Test Records ............................................................................................ 46
3.11.1. Restoring a Test Record from the Unit's Internal Flash EEPROM .......................... 46
3.11.2. Restoring a Test Record From a USB Flash Drive ................................................... 50
3.11.3. Viewing a Test Record ............................................................................................ 52
3.11.4. Printing a Test Record ............................................................................................ 54
3.11.5. Saving a Test Record From the Working Memory ................................................. 55
3.11.6. Copying Test Records to a USB Flash Drive............................................................ 57
3.11.7. Printing a Directory of Test Records Stored in the WRM's Internal Memory........ 59
3.11.8. Printing a Directory of Test Records Stored in a USB Flash Drive.......................... 62
3.11.9. Erasing Test Records From the Unit's Internal Memory........................................ 64
3.11.10. Erasing Test Records From a Connected USB Flash Drive...................................... 67
4.0 WRM-10P S2 SPECIAL FEATURES....................................................................................... 70
4.1 Bypassing the Resistance Reading Delay ....................................................................... 70
4.2 Converting Resistance Measurements .......................................................................... 71
5.0 Troubleshooting Guide ...................................................................................................... 72

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LIST OF FIGURES
Figure 1. WRM-10P S2 Controls and Indicators.............................................................................. 5
Figure 2. Typical WRM Connections Diagram #1............................................................................ 8
Figure 3. Typical WRM Connections Diagram #2............................................................................ 8
Figure 4. Typical WRM Connections Diagram #3............................................................................ 9
Figure 5. Typical WRM Connections Diagram #4............................................................................ 9
Figure 6. Typical V1 Test Report Printout ..................................................................................... 22
Figure 7. Typical V1 and V2 Test Report Printout......................................................................... 23
Figure 8. Typical V1 and V2 Test Report Printout with Multiple Readings .................................. 24
Figure 9. Typical LTC/Voltage Regulator Test Report Printout..................................................... 31
Figure 10. Typical Special Test Report Printout (1 minute @ 10 second intervals) ..................... 38
Figure 11. Typical Transient Test Report ...................................................................................... 43
Figure 12. Typical Internal Test Record Directory Printout .......................................................... 61
Figure 13. Typical USB Flash Drive Test Record Directory Printout.............................................. 63
LIST OF TABLES
Table 1. WRM-10P S2 Technical Specifications .............................................................................. 4

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CONVENTIONS USED IN THIS DOCUMENT
This document uses the following conventions:
•The WRM-10P S2 is referred to as WRM for short.
•A key, switch, or knob on the WRM-10P S2 is indicated as [KEY],[SWITCH],[KNOB].
•Menu names are referenced as “MENU NAME”
•WRM LCD screen output is shown as:
•Warning messages are indicated as:
WARNING
Warning message
•Important notes are indicated as:
NOTE
Note details
1.OPTION 1
2.OPTION 2
3.OPTION 3
4.OPTION 4
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1.0 INTRODUCTION
1.1 General Description and Features
The WRM-10P S2 is Vanguard's second generation lightweight winding resistance meter,
designed to accurately measure the winding resistance of highly inductive power transformers.
The unit’s dual resistance-reading input channels can measure two winding resistances
simultaneously, and four-wire (Kelvin) connections provide high accuracy and require no lead
compensation. The WRM-10P S2 provides stable resistance readings of very large transformers
by utilizing a 36Vdc power supply capable of outputting up to 10 Amperes. The resistance
reading of a 100MVA transformer can be achieved in 5 minutes or less. The unit’s power supply
is cooled by heavy-duty fans designed for continuous operation. For greater flexibility in the
field, the WRM-10P S2 comes with a built-in 2.5" wide thermal printer used for printing test
reports.
The WRM-10P S2 can also be used to measure EHV circuit-breaker contact resistance, motor
winding resistance, or any low resistance since it can accurately measure resistances ranging
from 1 micro-ohm to 2,000 ohms. If the transformer winding temperature is entered, the
WRM-10P S2 can calculate the equivalent resistance value of the winding material (aluminum
or copper) at any standard reference temperature. Also, a special test mode can run a test for
up to 60 minutes while saving resistance readings at 10, 15, 20, 30, or 60 second intervals. In
addition to measuring the resistance value, the WRM-10P S2 also checks the “make-before-
break” tap-switching sequences of voltage regulators and load tap changers.
The WRM-10P S2 is furnished with three 50-foot test cables. Each test cable lead is terminated
with a quick-disconnect test clip.
Built-in Safety Features
The WRM-10P S2 automatically dissipates the stored energy in the transformer at the end of
each test. This discharge circuit will continue to work even if the supply voltage is lost. For
added safety, the unit’s power supply is thermally protected from over-load damage.
User Interface
The WRM-10P S2 features a 5" back-lit LCD screen (240 x 128 pixels) that is viewable in bright
sunlight and low-light levels. A rugged, "QWERTY"-style, membrane keyboard is used to control
the unit.
Built-in Thermal Printer
The WRM-10P S2 features a built-in 2.5” wide thermal printer that can be used to print test
reports in the field.

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Internal Test Record Storage
The WRM-10P S2 can store 100 test records (up to 64 readings per test record) in Flash
EEPROM. Test records can be retrieved and printed on the built-in thermal printer or can be
transferred to a PC via the USB PC or USB Flash drive interfaces. Windows® -based software is
provided with each WRM-10P S2 that can be used to retrieve test records from the unit and can
also be used to export records in Microsoft® Excel format.

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1.2 WRM-10P S2 Technical Specifications
Table 1. WRM-10P S2 Technical Specifications
TYPE
Portable transformer winding resistance meter
PHYSICAL SPECIFICATIONS
Dimensions: 17.5”W x 11.75”H x 12.5” D (44.5 cm x 29.8 cm x 31.8 cm)
Weight: 27 lbs (12.2 kg)
INPUT POWER
100 – 120 Vac or 200 – 240 Vac (factory pre-set), 50/60 Hz
RESISTANCE READING
RANGE
1 micro-ohm –2,000 ohms
ACCURACY
1 – 19,999 micro-ohms: ±0.5% reading, ±1 count
20 – 999 milliohms: ±1% reading, ±1 count
1 – 2,000 ohms: ±1.5% reading, ±1 count
TEST VOLTAGE
36 Vdc max
TEST CURRENT RANGE
Auto range, 10 Amperes max
DISPLAY
5" back-lit LCD screen (240 x 128 pixels); viewable in bright sunlight and low-
light levels
PRINTER
2.5-inch wide built-in thermal printer
KEYPAD
Rugged "QWERTY"-style membrane keypad
INTERNAL TEST RECORD
STORAGE
Stores 100 test records of 64 readings each
COMPUTER INTERFACE
USB PC, USB Flash drive
PC SOFTWARE
Windows®-based software is included with purchase price
SAFETY
Designed to meet IEC61010 (1995), UL61010A-1, CSA-C22.2 standards
TEMPERATURE
Operating: -10˚C to +50˚ C (+15˚F to +122˚ F)
Storage: -30˚ C to +70˚ C (-22˚F to +158˚ F)
HUMIDITY
90% RH @ 40°C (104°F), non-condensing
ALTITUDE
2,000 m (6,562 ft) to full safety specifications
CABLES
Three 50-foot (15.24m) test cables, one ground cable, one power cord, one
USB cable and cable carrying bag
OPTIONS
Shipping Case
WARRANTY
One year on parts and labor
NOTE
The above specifications are valid at nominal operating voltage and at a
temperature of 25°C (77°F). Specifications may change without prior notice.

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1.3 WRM-10P S2 Controls and Indicators
The WRM-10P S2's controls and indicators are shown in Figure 1. The purpose of the controls
and indicators may seem obvious, but users should become familiar with them before using the
WRM. Accidental misuse of the controls will usually cause no serious harm. Users should also
be familiar with the safety summary found on the front page of this User’s Manual.
Figure 1. WRM-10P S2 Controls and Indicators

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2.0 PRE-TEST SETUP
2.1 Operating Voltages
The WRM’s operating voltage is preset at the factory and is selectable between 100-120 Vac,
50/60 Hz or 200-240 Vac, 50/60 Hz.
2.2 LCD Screen Contrast Control
To increase the LCD screen contrast, press and hold the [] key for two seconds.
To decrease the LCD screen contrast, press and hold the [] key for two seconds.
2.3 Printer Paper Control
To advance the WRM printer paper, press and release the [] key.
To retract the WRM printer paper, press and release the [] key.
2.4 Printer Paper
The WRM’s built-in thermal printer uses 2.5" 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 is highly recommended. Additional paper can be ordered from the
following sources:
Vanguard Instruments
1520 S. Hellman Avenue
Ontario, CA 91761
Tel: [phone]
Fax: [phone]
Part Number: VIC TP-3 paper
BG Instrument Co.
13607 E. Trent Avenue
Spokane, WA 99216
Tel: [phone]
Fax: [phone]
Part Number: VIC TP-3 paper

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2.5 Replacing the Thermal Printer Paper
The roll of thermal paper is housed inside a dispenser underneath the printer cover. To replace
the paper, follow the steps below:
•Unscrew the two large printer cover screws and remove the printer cover.
•Remove the leftover thermal paper roll from the paper holder.
•Unroll the new thermal paper roll.
•Feed the thermal paper into the slot between the paper pocket and the rubber roller.
The printer will automatically pull the paper under the thermal head.
•Place the paper roll into the paper holder.
•Lift the thermal head and align the thermal paper if necessary.
•Re-install the printer cover.
NOTE
Thermal paper has a chemical coating on one side of the paper. This side should be
facing the thermal print head. Incorrect paper loading may result in blank output on
the thermal paper.
The thermal paper will show a red stripe to indicate that the roll is about to run out
of paper.

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3.0 OPERATING PROCEDURES
3.1 WRM Cable Connections
Typical WRM connection diagrams are shown in Figure 2, Figure 3, Figure 4, and Figure 5.
WARNINGS
•Do not touch or disconnect any test lead that is connected to a transformer
terminal while high current is being conducted during a test. Failure to heed
this warning can result in lethal electric shock to personnel and/or damage
to the equipment.
•Disconnect the test clips from the transformer bushing only after the WRM
has completely discharged the transformer. Always disconnect the test clips
slowly from the transformer bushing to prevent an accidental flash-over.
Figure 2. Typical WRM Connections Diagram #1
Figure 3. Typical WRM Connections Diagram #2

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Figure 4. Typical WRM Connections Diagram #3
NOTE
Th
e above figure illustrates the simultaneous testing of both the high and low
windings
on a single-phase transformer. When measuring two channels, the above
cable connection is recommended
since it will speed up the testing process.
Figure 5. Typical WRM Connections Diagram #4

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3.2 General Procedures
The main steps for using the WRM are outlined below:
a. Ground the WRM to the substation ground.
WARNING
Always connect the WRM to the substation ground before connecting any
test lead to any transformer bushing. Failure to follow this procedure may
damage the WRM.
b. Plug the WRM power cable into a power outlet.
c. Insert current-cable plugs and voltage-sensing cable plugs into the corresponding
control panel jacks.
d. Attach the test cable clamps to the transformer terminal for the winding that is to be
measured.
e. Turn on the WRM by pressing [I] on the power rocker switch.
f. The unit will self-calibrate, and then you will be presented with the “START-UP” menu as
shown below:
1.RUN TEST
2.TEST RECORDS
3.DIAGNOSTICS
4.SETUP
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3.3 Entering Test Record Header Information
You can enter the test record header information before performing tests. The record header
includes identifying information such as the company, station, circuit, model number, etc. Once
the header information has been entered, it will apply to all subsequent test records. To enter
the header information:
a. Start from the “START-UP” menu:
Press the [4] key (SETUP).
b. The following screen will be displayed:
Press the [1] key (ENTER SHOT ID).
c. The following screen will be displayed:
Type the company name using the keypad and press the [ENTER] key.
COMPANY:

_

↑↓TO POSITION
"ENTER" TO ACCEPT

1.ENTER SHOT ID
2.SET TIME
3.SET LANGUAGE
4.CAL PRINT ON/OFF
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
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1.RUN TEST
2.TEST RECORDS
3.DIAGNOSTICS
4.SETUP
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d. The following screen will be displayed:
Type the station name using the keypad and press the [ENTER] key.
e. The following screen will be displayed:
Type the circuit information using the keypad and press the [ENTER] key.
f. The following screen will be displayed:
Type the manufacturer name using the keypad and press the [ENTER] key.
g. The following screen will be displayed:
Type the transformer model information using the keypad and press the [ENTER] key.
MODEL:



↑↓TO POSITION
"ENTER" TO ACCEPT
MANUFACTURER:



↑↓TO POSITION
"ENTER" TO ACCEPT
CIRCUIT:



↑↓TO POSITION
"ENTER" TO ACCEPT
STATION:


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↑↓TO POSITION
"ENTER" TO ACCEPT
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h. The following screen will be displayed:
Type the transformer serial number using the keypad and press the [ENTER] key.
i. The following screen will be displayed:
Type the transformer’s KVA rating using the keypad and press the [ENTER] key.
j. The following screen will be displayed:
Type the operator’s name using the keypad and press the [ENTER] key.
All header information will be saved, and you will be returned to the “START-UP” menu.
OPERATOR:



↑↓TO POSITION
"ENTER" TO ACCEPT
KVA:



↑↓TO POSITION
"ENTER" TO ACCEPT
SERIAL NUMBER:
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↑↓TO POSITION
"ENTER" TO ACCEPT

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3.4 Setting the Clock
Follow the steps below to set the WRM-10P S2's internal clock:
a. Start from the "START-UP" menu:
Press the [4] key (SETUP).
b. The following screen will be displayed:
Press the [2] key (SET TIME).
c. The following screen will be displayed:
Enter the month, date, and year using the keypad. When the last digit is entered, the
following screen will be displayed:
Enter the hours (in 24-hour military format), minutes, and seconds using the keypad.
When the last digit is entered, the clock will be set, and you will be returned to the
"START-UP" menu.
ENTER TIME
HH:MM:SS
_
ENTER DATE
MM-DD-YY
_
1.ENTER SHOT ID
2.SET TIME
3.SET LANGUAGE
4.CAL PRINT ON/OFF
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1.RUN TEST
2.TEST RECORDS
3.DIAGNOSTICS
4.SETUP
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3.5 Toggling the Calibration Notification Feature
The WRM-10P S2 offers a convenient feature that can print the unit's calibration due date at
the bottom of the test reports printed on the unit's thermal printer. Follow the steps below to
toggle this feature:
a. Start from the "START-UP" menu:
Press the [4] key (SETUP).
b. The following screen will be displayed:
Press the [4] key (CAL PRINT ON/OFF).
c. The following screen will be displayed:
Press the [1] key (ENABLE) to enable or the [2] key (DISABLE) to disable this feature.
d. The following screen will be displayed (enabled option shown):
Press any key to return to the "START-UP" menu.
CAL DATE PRINTING
ENABLED.
CAL DATE PRINTING:
1.ENABLE
2.DISABLE
1.ENTER SHOT ID
2.SET TIME
3.SET LANGUAGE
4.CAL PRINT ON/OFF
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1.RUN TEST
2.TEST RECORDS
3.DIAGNOSTICS
4.SETUP
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3.6 Performing a Resistance Test
a. Start from the “START-UP” menu:
Press the [1] key (RUN TEST).
b. The following screen will be displayed:
Press the [1] key (V1 & V2 TEST) if you would like to perform a V1 & V2 test.
Press the [2] key (V1 ONLY TEST) if you would like to perform a V1 test only.
For this example, we will perform a V1 Only Test by pressing the [2] key.
Please see section 3.8 for information about performing special tests.
NOTE
The WRM-10P S2's test current is 10 Amps.
c. The following menu will be displayed:
Press the [2] key (NO).
LTC or VTG REGULATOR?
1. YES
2. NO



1.V1 & V2 TEST
2.V1 ONLY TEST
3.SPECIAL TEST V1, V2
4.SPECIAL TEST V1
5.TRANSIENT TEST
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

1.RUN TEST
2.TEST RECORDS
3.DIAGNOSTICS
4.SETUP
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