WRM-10 - Vanguard Instruments Company, Inc.
Contents
1. 6 Typical WRM 10 Connections Diagram 2 10 Figure 7 Typical Dual Winding Connections Diagram 10 LIST OF TABLES Table 1 WRM 10 Technical SpecificatiONS i 3 Table 2 Functional Descriptions of WRM 10 Controls and Indicators 5 Table 3 Voltage Selection Jumper Settings ie 6 WRM 10 USER S MANUAL REV 2 CONVENTIONS USED IN THIS DOCUMENT This document uses the following conventions e The WRM 10 s control knob is referenced as CONTROL KNOB e Menu names are referenced as MENU NAME e WRM 10 LCD screen output is shown as e Warning messages are indicated as e Important notes are indicated as REV 2 WRM 10 USER S MANUAL 1 0 INTRODUCTION 1 1 General Description and Features The WRM 10 is 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 Four wire Kelvin connections provide high accuracy voltage reading and require no lead compensation The WRM 10 provides stable resistance readings of very large transformers by utilizing a 36 Vdc 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 Since the WRM 10 can ac2. Blue and Yellow to Green HE2aN Q AC120V 200 240 Vac Blue to Yellow HE2aN Q AC 240V Figure 3 200 240 Vac Jumper Settings Tee eee WRM 10 USER S MANUAL gt DA Pa k arai A 599 pS Te Ei fay ms li mn NOTE If the voltage settings oe 9 e are changed the relay must also be changed Figure 4 Relay Location REV 2 WRM 10 USER S MANUAL 2 2 LCD Screen Contrast Control To adjust the LCD screen s contrast a Start from the MAIN MENU MAIN MENU lt RUN TEST gt Turn the CONTROL KNOB till the following screen is displayed MAIN MENU lt ADJ CONTRAST gt Press the CONTROL KNOB b The following screen will be displayed ADJ CONTRAST PUSHY DONE Turn the CONTROL KNOB clockwise to increase the contrast darken the screen Turn the CONTROL KNOB counter clockwise to decrease the contrast lighten the screen Press the CONTROL KNOB when you are done adjusting the contrast level You will be returned to the MAIN MENU WRM 10 USER S MANUAL REV 2 3 0 OPERATING PROCEDURES 3 1 WRM 10 Cable Connections Typical WRM 10 connections diagrams are shown in Figure 5 and Figure 6 A typical dual winding connections diagram is shown in Figure 7 Figure 5 Typical WRM 10 Connections Diagram 1 REV 2 WRM 10 USER S MANUAL Figure 6 Typical WRM 10 Connections Diagram 2 Figure 7 Typical Dual Winding Connections Diagram
3. Press the CONTROL KNOB b The following screen will be displayed RUN TEST lt V1 amp Ve gt Turn the CONTROL KNOB till the following screen is displayed RUN TEST lt VTG REG gt Press the CONTROL KNOB c The following screen will be displayed FLASH OVER IF CABLES REMOVED Press the CONTROL KNOB d The following screen will be displayed VTG REG TEST PUSHY TO START Press the CONTROL KNOB to start the test WRM 10 USER S MANUAL REV 2 e The following screen will be displayed while the test is being performed After the transformer has been charged the following screen will be displayed Run the voltage regulator tap switch f If no transient is detected as the taps are switching 1 The screen display will not change 2 Turn or press the CONTROL KNOB to end the test The following screen will be displayed If a switch break is detected 1 The following message will be displayed 2 Turn or press the CONTROL KNOB to end the test REV 2 WRM 10 USER S MANUAL 3 4 User Diagnostic Mode The user diagnostic mode can be used to monitor the V1 and V2 voltages and the test current on the WRM 10 s LCD screen To use the WRM 10 in user diagnostic mode a Connect the WRM 10 to the test transformer and then start from the MAIN MENU MAIN MENU lt RUN TEST gt Turn the CONTROL KNOB till the following screen is displayed MAIN MENU lt US
4. WRM 10 USER S MANUAL REV 2 3 2 General Procedures The main steps for using the WRM 10 are outlined below a Ground the WRM 10 to the substation ground b Plug the WRM 10 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 10 by pressing I on the power rocker switch f The unit will self calibrate and then you will be presented with the MAIN MENU as shown below REV 2 WRM 10 USER S MANUAL 3 3 3 3 1 Performing Transformer Tests Performing a Single Resistance Test Start from the MAIN MENU MAIN MENU lt RUN TEST gt Press the CONTROL KNOB The following screen will be displayed RUN TEST lt V1l amp Ve gt Turn the CONTROL KNOB till the following screen is displayed RUN TEST lt VL ONLY gt Press the CONTROL KNOB The following screen will be displayed FLASH OVER IF CABLES REMOVED Press the CONTROL KNOB The following screen will be displayed PRESS TO START TURN TO ABORT Press the CONTROL KNOB to start the test You can abort the test by turning the CONTROL KNOB The following screen will be displayed 4 XFMR CHARGING 4 The above screen will continue to display while the WRM 10 is performing the test the lightning bolts
5. indicator light This warning indicator is lit when the WRM 10 is 7 DISCHARGE discharging the stored energy in the transformer Do NOT disconnect the test leads when this light is on Failure to heed this warning can result in shock and or fatal injury to personnel CHANGE Single turn and press control knob used to operate the WRM 10 You can scroll 8 PUSH TO through different menu options by turning this knob and you can select a SELECT function by pressing the knob Red LED indicator light This warning light is illuminated when there is a 9 HIGH VOLTAGE _ possibility of high voltage across the test leads Do NOT disconnect the test PRESENT leads when this light is on Failure to heed this warning can result in shock and or fatal injury to personnel 10 V2 Voltage input sensing channel 2 Female connector jacks used for connecting voltage sensing test leads REV 2 WRM 10 USER S MANUAL 2 0 PRE TEST SETUP 2 1 Operating Voltages The WRM 10 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 The voltage is set by placing jumper s on the power terminal block as listed in Table 3 and illustrated in Figure 2 and Figure 3 The relay must also be changed if the voltage settings are changed Please see Figure 4 for the location of the relay Table 3 Voltage Selection Jumper Settings Voltage Relay Selection Terminal Block Jumpers Part Numbet 100 120 Vac Brown to
6. ER DIAG gt Press the CONTROL KNOB b The following screen will be displayed RUN TEST lt V1 amp Ve gt Turn the CONTROL KNOB till the following screen is displayed FLASH OVER IF CABLES REMOVED Press the CONTROL KNOB c The following screen will be displayed PRESS TO START TURN TO ABORT Press the CONTROL KNOB to start the test d The following screen will be displayed momentarily CALIBRATING PLEASE WAIT The WRM 10 will then alternate between displaying the following screens Vl 1 03V Ve 1 O3V I 00 005A I 00 005A e Press or turn the CONTROL KNOB to end the test You will be returned to the MAIN MENU A Se ii Vanguard Instruments Company Inc 1520 S Hellman Ave e Ontario CA 91761 e USA Phone 909 923 9390 e Fax 909 923 9391 www vanguard instruments com Copyright 2009 by Vanguard Instruments Company Inc WRM 10 User s Manual e Revision 2 0 e June 5 2009 e TA
7. FICATIONS INPUT POWER RESISTANCE READING RANGE ACCURACY TEST VOLTAGE TEST CURRENT RANGE DISPLAY CONTROL COMPUTER INTERFACE SAFETY ENVIRONMENT CABLES OPTIONS WARRANTY Portable transformer winding resistance meter 16 8 W x 12 6 H x 10 6 D 42 6 cm x 32 0 cm x 27 cm Weight 27 Ibs 12 2 kg 100 120 Vac or 200 240 Vac factory pre set 50 60 Hz 1 micro ohm 2 000 ohms 1 19 999 micro ohms 0 5 reading 1 count 20 999 milli ohms 1 reading 1 count 1 2 000 ohms 1 5 reading 1 count 36 Vdc max Auto range 10 Amperes max Back lit LCD Screen 16 characters by 2 lines viewable in bright sunlight and low light levels Single turn and push knob RS 232C port 19 200 baud used for factory calibration and diagnostics Designed to meet IEC61010 1995 UL61010A 1 CSA C22 2 standards Operating 10 C to 50 C 15 F to 122 F Storage 30 C to 70 C 22 Fto 158 F Three 50 foot test cables ground cable power cord and cable bag Transportation case One year on parts and labor REV 2 WRM 10 USER S MANUAL 1 4 WRM 10 Controls and Indicators The WRM 10 s controls and indicators are shown in Figure 1 below A leader line with an index number points to each control and indicator which is cross referenced to a functional description in Table 2 The table describes the function of each item on the control panel The purpose of the controls and indicators m
8. TM WRM 10 TRANSFORMER WINDING RESISTANCE METER USER S MANUAL Vanguard Instruments Company Inc 1520 S Hellman Ave Ontario California 91761 USA TEL 909 923 9390 June 2009 FAX 909 923 9391 Revision 2 WRM 10 USER S MANUAL REV 2 SAFETY SUMMARY FOLLOW EXACT OPERATING PROCEDURES Any deviation from the procedures described in this User s Manual may create one or more safety hazards may damage the WRM 10 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 WRM 10 All safety precautions provided in this manual must be observed during all phases of testing including test preparation test lead connection actual testing and test lead disconnection SAFETY WARNING AND CAUTIONS The WRM 10 shall be used only by trained operators All transformers under test shall be off line and fully isolated 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 WRM 10 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 remov
9. ay seem obvious but users should become familiar with them before using the WRM 10 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 ct WRM 10 TRANSFORMER RESISTANCE METER i o HIGH VOLTAGE PRESENT CHANGE pn PUSH TO SELECT CC warnine DO NOT TOUCH OR REMOVE WQUIPMENT DAMAGE Figure 1 WRM 10 Controls and Indicators WRM 10 USER S MANUAL REV 2 Table 2 Functional Descriptions of WRM 10 Controls and Indicators Moni Panel Markings Functional Description Number 1 VI Voltage sensing input channel 1 Female connector jacks used for connecting voltage sensing test leads 2 Current output Female connector jacks used for connecting current test leads 3 Noce Back lit LCD screen 16 characters by 2 lines viewable in bright sunlight and low light levels Safety ground terminal 5 16 18 threaded stud with hand turned wing nut This 4 GROUND must be connected to the station ground before connecting any WRM 10 test leads to the transformer 100 120 Vac 2A Input power connector with third wire safety ground On Off rocker toggle switch 5 50 60 Hz with built in fuse protection Fuse 250 Vac 3A Slow Blow 9 pin RS 232C interface port female DB type Data rate is set to 19 200 baud 1 start bit 2 stop bits 8 data bits and no parity bit 6 RS 232C Signal Ground Red LED
10. curately measure resistances ranging from 1 micro ohm to 2 000 ohms it can also be used to measure EHV circuit breaker contact resistance motor winding resistance or any low resistance In addition to measuring the resistance value the WRM 10 also checks the make before break tap switching sequences of voltage regulators and load tap changers The WRM 10 is furnished with three 50 foot test cables a ground cable a power cord anda cable carrying bag Each test cable lead is terminated with a quick disconnect test clip 1 2 Functional Description The WRM 10 s operation is based on the electrical relationship described by Ohm s law R V I where is a known current and V is the DC voltage measured across the unknown resistance The value of the unknown resistance is calculated by dividing the measured voltage by the current which is calculated by the microprocessor Calculated resistance readings are then displayed on the unit s back lit LCD screen A special current source allows the WRM 10 to output up to 10 Amperes of test current The test current is automatically adjusted depending on the load resistance For added safety the current source circuit is thermally protected Also a built in discharge circuit automatically discharges the stored energy in the transformer at the end of each test WRM 10 USER S MANUAL REV 2 1 3 Technical Specifications Table 1 WRM 10 Technical Specifications TYPE PHYSICAL SPECI
11. e test leads during a test Failure to heed this warning can result in lethal electrical shock to personnel and damage to the equipment REV 2 WRM 10 USER S MANUAL TABLE OF CONTENTS CONVENTIONS USED IN THIS DOCUMENT cscccccessecceceesecceceeeescceeeeeecceseeeeeceseeeseeesseegeeesseees 1 ko TINO CN ani 2 1 1 General Description and Features waccsieisccovsnecastasesncevanecosvawadsnaoesnssusabsedatwevarndegaaneaceneawensed 2 13 Technical SCC NIC ANIONS sareren ina arr 3 LA WRM 10Controlsand Indicators oiccscetsicecssncdsnncdsacameedseusnceessnceputsevaiwasbarseeantsasnwounsiweandons 4 20 PREIE es Ce E i 6 2 1 OPEratineVOtages narra 6 30 ORERATINO PROCEDURES ra 9 31 VRM 10Cable Connecions acari 9 Sl General PiOCedUfe snai 11 3 3 Performing Transformer Tests dra 12 3 3 1 Performing a Single Resistance Test rei 12 3 3 2 Performing a voltage Regulator Test sisicecavicccccenessaecariesasatenesesiwancesacctviaccdemenncenss 14 SA UserDiagnostio MODE aaa 16 LIST OF FIGURES Figure 1 WRM 10 Controls and Indicators 4 Figure 2 100 120 Vac Jumper SettihgS seicsovecstsanstosntiussianieuevcantexssssineussesiasnncennuereseeseinrnieoneees 6 Figure 3 200 240 Vac Jumper Settings n sessesssssesssesssnssesssnssnrassessnsessnrassnnesennassssesnascerasosresosss 6 FIcure RelVioGGi0ni ana 7 Figure 5 Typical WRM 10 Connections Diagram 1 9 Figure
12. will be flashing When the WRM 10 has determined that the resistance readings are stable the test results will be displayed as shown WRM 10 USER S MANUAL REV 2 The WRM 10 will continue to apply the test voltage on the transformer s windings and update the resistance values on the LCD screen Press the CONTROL KNOB to stop the test f The WRM 10 will automatically discharge the transformer and display the following screen during the discharging process After the transformer is discharged the test results will be displayed on the screen as shown Press the CONTROL KNOB You will be returned to the MAIN MENU REV 2 WRM 10 USER S MANUAL 3 3 2 Performing a Voltage Regulator Test The Voltage Regulator Test verifies that a regulating switch in a primary voltage tap regulator changes contacts through its selection range without a break in the circuit This test is important because in actual use any break in the current in a regulating tap switch generates large reactive voltage spikes that are hazardous and may exceed the switch s voltage ratings thus causing irreparable damage By connecting the WRM 10 s continuity test input across the switching input and running the regulator switch through all the contacts in its range any break in continuity caused by faulty tap switching can be detected To perform a voltage regulator test a Start from the MAIN MENU MAIN MENU lt RUN TEST gt
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