WRM-10P and WRM-40 - Vanguard Instruments Company, Inc.
Contents
1. MODEL SAN RECORD NUMBER 1 DATE TIME 11 06 09 09 19 08 NUMBER OF TESTS 1 STATION CIRCUIT MODEL SAN Figure 17 Typical Test Record Directory Printout REV3 WRM 10P AND WRM 40 USER S MANUAL 3 9 4 Erasing Test Records Follow the steps below to erase a single test record or the entire directory of test records from the WRM s Flash EEPROM a Start from the START UP menu Press the 2 key SETUP b The following screen will be displayed Press the 3 key RESTORE RECORD c The following screen will be displayed Press the 3 key ERASE RECORDS d The following screen will be displayed 1 ERASE SINGLE REC Press the 1 key ERASE SINGLE REC to erase a single record The following screen will be displayed WRM 10P AND WRM 40 USER S MANUAL Type the record number that you would like to erase and then press the ENTER key The following screen will be displayed RECORD NUMBER 1 ERASED Press any key to return to the START UP menu 2 ERASE ALL RECORDS Press the 2 key ERASE ALL RECORDS to erase all records stored in the WRM s Flash EEPROM The following screen will be displayed ERASE ALL RECORDS Are you sure ENTER TO CONTINUE If you would like to cancel the process press the STOP key Press the ENTER key to erase all test records The following screen will be displayed when all the test records ha2. Press the 4 key NEXT PAGE c The following screen will be displayed 1 CONTROL 2 SET TIME Je VOLTAGE REG TEST Press the 2 key SET TIME d The following screen will be displayed ENTER MM DD YY HH MM SS Type in the date and time using the alpha numeric keypad When the complete date and time has been entered you will be immediately returned to the START UP menu REV3 WRM 10P AND WRM 40 USER S MANUAL 40 WRM 10P 40 SPECIAL FEATURES 41 Bypassing Resistance Reading Delay When the WRM first applies the test voltage to the transformers winding the current is increased slowly until the transformer s winding reaches saturation During this period the resistance value varies substantially and the readings may appear unstable to the operator The WRM has a built in 3 minute delay between the start of the test and when the resistance value is displayed on the LCD This feature eliminates the possibility of early erroneous readings Depending on the transformer size the delay may be shorter or longer than 3 minutes The operator can bypass this delay and observe the test results immediately To bypass this delay Start at the START UP menu 1 TEST XFMR 11 02 09 g SETUP 2 33 01 3 USER DIAG Press the numbers 9 8 and 7 in sequence The following screen will be displayed momentarily QUICK DISPLAY MODE You will then be returned to the START UP menu
3. Once the Quick Display Mode has been set the WRM will display resistance values as soon as measurements are made This bypass setting will remain active until the unit is turned off When the unit is turned on again it will use the default 3 minute delay before displaying resistance values WRM 10P AND WRM 40 USER S MANUAL REV3 4 2 Converting Resistance Measurements The WRM can convert the resistance reading of the device under test at its present temperature to the equivalent resistance value at a different temperature The conversion is accomplished by the following formula Rs Rm Ts Tk Tm Tk Where Rs is the resistance at desired temperature Rm is the measured resistance Ts is the desired reference temperature Tm is the temperature at which the resistance was measured Tk is the constant used for the winding material Tk 234 5 for copper Tk 240 0 for aluminum REV3 WRM 10P AND WRM 40 USER S MANUAL 5 0 Troubleshooting Guide PROBLEM DESCRIPTION No current displayed on the LCD screen when performing a test Resistance reading is zero or invalid while current value is displayed on the LCD screen Probable Cause Opened current cable connection Opened transformer windings Opened sense leads connection Sense leads problem Suggested Solution Check current cable connection e Perform a quick test using a shunt or a piece of aluminum bar e Check sense leads connection t
4. WRM determines when the resistance reading is stable displays the resistance values on the LCD screen as shown below TEST IN PROGRESS 21 I O OJA R1 997 4yQ R2 DuO XFMR ENERGIZED Press the ENTER key to accept and save the readings m The following screen will be displayed TEST IN PROGRESS dl 0 01 1 99 1 SAVING TEST ENERGIZED Once the reading has been saved the following screen will be displayed momentarily TEST IN PROGRESS dl 0 01 1 99 1 TEST SAVED XFMR ENERGIZED n After saving the readings the following screen will be displayed SET 2L THEN START ENERGIZED Set the LTC or Voltage Regulator tap position to the position indicated on the LCD screen press the START key The WRM will continue the test and display the results as in step Repeat steps through m for all Lower positions and then through all Raise positions REV3 WRM 10P AND WRM 40 USER S MANUAL o The following screen will be displayed after the last Raise position s resistance reading is stored PRINT RECORD 1 YES NO 1 5 Pressthe 1 key YES to print the test results on the built in thermal printer Typical LTC Voltage Regulator test report is shown in Figure 14 Continue to step p 2 NO Press the 2 key NO to bypass printing of the test results Continue to step p p The following screen will
5. f Thefollowing screen will be displayed REFERENCE TEMP 85 D C 185 9 to adjust temp ENTER to accept Use the PAPER Contrast and PAPER v Contrast keys to adjust the reference temperature Press the ENTER key to confirm the reference temperature setting ll WRM 10P AND WRM 40 USER S MANUAL g The following warning screen will be displayed This warning is a reminder that the next sequence of test steps will run current through the test load Press any key to continue h The following screen will be displayed Press the START key to run the test i Thefollowing screen will be displayed momentarily This is only an informational screen to remind the operator that a test is in progress The display duration of this message depends on the size of the winding s inductance j WRM determines when the resistance reading is stable and shows the resistance value on the LCD screen as shown below the first line shows the remaining test time REV3 WRM 10P AND WRM 40 USER S MANUAL When the pre defined test time has elapsed the following screen will be displayed Press any key to continue k The following screen will be displayed 1 YES Pressthe 1 key YES to save the test record Continue to step l 2 NO Press the 2 key NO if you do not want to save the test record The following screen will be displayed Press the 1 ke
6. 0 MICRO OHMS Res 0 MICRO OHMS TAP Z RAISE TAP 1 LOWER 996 5 OHMS Ris 1226 9 OHMS 0 MICRO OHMS Res 0 MICRO OHMS R1 997 3 OHMS Rls 1227 9 OHMS Re 0 MICRO OHMS Res 0 MICRO OHMS TAP 3 RAISE TAP NEUTRAL 996 9 OHMS Rls 1227 4 OHMS 0 MICRO OHMS 0 MICRO OHMS Res 0 MICRO OHMS Res 0 MICRO OHMS Figure 14 Typical LTC Voltage Regulator Test Report Printout R1 996 8 OHMS Ris 1227 3 OHMS WRM 10P AND WRM 40 USER S MANUAL 3 6 Performing a Special Resistance Test The Special Resistance Test is used to conduct a resistance test for a pre defined period ranging from 1 to 45 minutes The resistance data is recorded at one minute intervals Use the steps below to perform a Special Resistance Test a Start from the START UP menu l TEST XFMR 11 02 04 g SETUP 2 33 01 3 USER DIAG Pressthe 1 key TEST b The following screen will be displayed l 8 Ve TEST VI ONLY TEST 3 SPECIAL TEST VLl V2 4 SPECIAL TEST VI Press the 3 key SPECIAL TEST V1 V2 to perform a V1 and V2 special resistance test Press the 4 key SPECIAL TEST V1 to perform a V1 special resistance test The following screen will be displayed ENTER SPECIAL TEST TIME MINUTES 1 85 Enter the test time between 1 to 45 minutes using the alpha numer
7. ENTER key to confirm the temperature setting Continue to step 2 NO Press the 2 key NO if you do NOT wish to convert readings to standard temperature Continue to step e e following screen will be displayed D U T TEMP g5 D C U F te adjust temp ENTER to accept Use the PAPER Contrast and PAPER v Contrast keys to adjust the D U T Device Under Test temperature Press the ENTER key to confirm the D U T temperature setting f Thefollowing screen will be displayed REFERENCE TEMP 85 D C 185 9 to adjust temp ENTER to accept Use the PAPER Contrast and PAPER v Contrast keys to adjust the reference temperature Press the ENTER key to confirm the reference temperature setting X 0 WRM 10P AND WRM 40 USER S MANUAL REV3 h g The following warning screen will be displayed This warning is a reminder that the next sequence of test steps will run current through the test load Press any key to continue Press the START key to run the test i The following screen will be displayed momentarily This is only an informational screen to remind the operator thata test is in progress The display duration of this message depends on the size of the winding s inductance REV3 WRM 10P AND WRM 40 USER S MANUAL j WRM determines when the resistance reading is stable and displays the resistance values on the LCD
8. PRINT TEST RECORD Press the 2 key PRINT TEST RECORD to print the restored record The test record will be printed on the built in thermal printer and you will be returned to the START UP menu WRM 10P AND WRM 40 USER S MANUAL 3 9 2 Reviewing or Printing a Restored Test Record Once you have restored a test record to the working memory see section 3 9 1 you can print or review it at the time it was restored or at a later time Follow the steps below to review or print a test record after it has been restored to the working memory a Start from the START UP menu 1 TEST XFMR 11 02 09 g SETUP 2 33 01 3 USER DIAG Press the 2 key SETUP b The following screen will be displayed 1 ENTER ID REVIEW RECORD 3 RESTORE RECORD 4 NEXT PAGE Press the 2 key REVIEW RECORD c The following screen will be displayed REVIEW RECORD 1 SCROLL TEST RECORD PRINT TEST RECORD 1 SCROLL TEST RECORD Press the 1 key SCROLL TEST RECORD to view the test record on the LCD screen Use the PAPER v Contrast key to scroll to the next page Press the STOP key when you are done viewing the test record and you will be returned to the START UP menu 2 PRINT TEST RECORD Press the 2 key PRINT TEST RECORD to print the restored record The test record will be printed on the built in thermal printer and you will be returned to the START UP menu REV3
9. RECORD if you do not want to save the record You will be returned to the START UP menu Press the 2 key SAVE RECORD to save the record Continue to step o WRM 10P AND WRM 40 USER S MANUAL REV3 The following screen will be displayed Press any key to return to the START UP menu TEST RESULTS DATE 11 06 09 09 19 08 COMPANY STATION CIRCUIT WRMLOP S N 96285 KVA RATING OPERATOR 1 ONLY TEST R1 1 842 MILLI OHMS TAP ZWINDING DATE 11706709 09 19 08 Figure 11 Typical 1 Test Report Printout REV3 WRM 10P AND WRM 40 USER S MANUAL REC NUMBER 1 TEST RESULTS 09 19 08 DATE 11706709 COMPANY VIC STATION LAB CIRCUIT MFR MODEL WRM1LOP SAN 98285 RATING OPERATOR EQUIVALENT RESISTANCE DATA MEAS TEMP Tm 25 0C 77 0F REF TEMP 85 0C 185 0F COPPER WINDINGS Tk 234 5C Rs Rmeas x 22 All temps for eqn are in deg Vi amp V2 TEST R1 2 145 MILLI OHMS Measured Resistance Ris 2 641 MILLI OHMS R2 2 071 MILLI OHMS Res 2 550 MILLI OHMS TAP WINDING Equivalent Resistance at Reference Temperature Figure 12 Typical V1 and V2 Test Report Printout WRM 10P AND WRM 40 USER S MANUAL REV3 REC NUMBER 3 TEST RESULTS DATE 11706709 TIME 09 19 08 COMPANY VIC STATION LAB CIRCUI
10. be displayed SAVE THIS RECORD 1 YES 1 YES Press the 1 key YES save the test record The following screen will be displayed RECORD NUMBER DI HAN BEEN SAVED Press any key to return to the START UP menu 2 NO If you do not wish to save the test record press the 2 key NO The following screen will be displayed ARE YOU SURE DATA UILL BE LOST 1 Do NOT SAVE RECORD g SAVE RECORD Press the 1 key DO NOT SAVE RECORD to NOT save the test record You will be returned to the START UP menu LIEN 0 WRM 10P AND WRM 40 USER S MANUAL REV3 Press the 2 key SAVE RECORD to save the test record The following screen will be displayed Press any key to return to the START UP menu REV 3 WRM 10P AND WRM 40 USER S MANUAL TEST RESULTS DATE 11 12 09 10 07 30 COMPANY STATION CIRCUIT MFR MODEL S N KVA RATING OPERATOR 1 8 Ve STATIC LTC TEST EQUIVALENT RESISTANCE DATA MEAS TEMP 25 0C 77 0F REF TEMP Ts BS OC 185 0F COPPER WINDINGS TK 34 5 Re Rmeas x Ci Tls TK 7 m TK3DI All temps for eqn are in deg C TAP 3 LOWER 996 2 OHMS Ris 1226 5 OHMS R2 0 MICRO OHMS R2s 0 MICRO OHMS Test Results Continued TAP 1 RAISE Ri 996 5 OHMS Ris 1226 9 OHMS R2 0 5 Res 0 MICRO OHMS TAP 2 LOWER RL 996 9 OHMS Ris 1227 3 OHMS
11. 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 45 minutes while saving resistance readings at one minute intervals In addition to measuring the resistance value the WRM 10P also checks the make before break tap switching sequences of voltage regulators and load tap changers The WRM 10P can store test results in Flash EEPROM Test results can be printed on the built in 2 5 inch wide thermal printer or can be transferred to a PC via the RS 232C interface port The WRM 40 has all the features of the WRM 10P but is capable of outputting up to 40 Amperes The WRM 10P has a resistance reading range of 1 micro ohm to 2 000 ohms while the WRM 40 has a resistance reading range of 1 micro ohm to 500 ohms The WRM 10P and WRM 40 come furnished with three 50 foot test cables Each test cable lead is terminated with a quick disconnect test clip Built in Safety Features At the end of each test the WRM automatically dissipates the stored energy in the transformer 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 features a back lit LCD screen 20 characters by 4 lines that is viewable in both bright sunlight and low light levels A rugged alpha numeric membrane keypad is used
12. to control the unit REV3 WRM 10P AND WRM 40 USER S MANUAL Internal Test Record Storage The WRM can store 63 test records up to 48 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 RS 232C interface port Windows XP Vista based software application is provided with each WRM This software can be used to retrieve test records from the WRM and can also be used to export records in Microsoft Excel format WRM 10P AND WRM 40 USER S MANUAL REV3 1 2 Technical Specifications 1 2 1 WRM 10P Technical Specifications Table 1 WRM 10P Technical Specifications TYPE PHYSICAL SPECIFICATIONS INPUT POWER RESISTANCE READING RANGE ACCURACY TEST VOLTAGE TEST CURRENT RANGE DISPLAY PRINTER KEYPAD INTERNAL TEST RECORD STORAGE COMPUTER INTERFACE PC SOFTWARE 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 26 9 cm Weight 27 Ibs 12 2 kg 100 120 Vac or 200 240 Vac factory pre set 50 60 Hz Please see the voltage setting notes in section 2 1 1 micro ohm 2 000 ohms 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 36 Vdc max Auto range 10 Amperes max Back lit LCD Screen 20 characters by 4 lines viewab
13. 1 Test Report Printout r nnnm nnne nnns 26 Figure 12 Typical V1 and V2 Test Report 1 4 27 Figure 13 Typical V1 and V2 Test Report Printout with Multiple Readings 28 Figure 14 Typical LTC Voltage Regulator Test Report 35 Figure 15 Typical Five Minute Special Test Report Printout 40 Figure 16 Typical Transient Test nnns annees 43 Figure 17 Typical Test Record Directory 50 LIST OF TABLES Table 1 WRM 10P Technical 5 5 0 111 r 4 Table 2 WRM 40 Technical Specifications vveeeveeeooeeoooeoooooooooouoooouoooooooeooooooooooooooosooooooooooooooooeoos 5 Table 3 Functional Descriptions of WRM 10P Controls and Indicators 7 Table 4 Functional Descriptions of WRM 40 Controls and Indicators 9 Table 5 Voltage Selection Jumper Settings ennemis 10 REV3 WRM 10P AND WRM 40 USER S MANUAL CONVENTIONS USED IN THIS DOCUMENT This document uses the following conventions Both the WRM 10P and WRM 40 are simply referred t
14. 33 01 3 USER DIAG Press the 3 key USER DIAG b The following warning screen will be displayed XXXXXXXXUJARNINGXKXXKXXKXXX X DANGEROUS FLASH OVER WILL OCCUR IF CABLES ARE DISCONNECTED Press any key to continue The following screen will be displayed SER START RUN TEST OR STOP Press the START key d The V1 V2 and test current I will be displayed as shown below Vi Ve 26 13 mV 09 23 mV 1 0 1 A ENERGIZED Press the STOP key to end the test and return to the START UP menu REV3 WRM 10P AND WRM 40 USER S MANUAL 3 9 Working with Test Records 3 9 1 Restoring a Test Record for Review or Printing Use the steps below to restore a test record from the WRM s Flash EEPROM to the unit s working memory a Start from the START UP menu 1 TEST XFMR 11 02 09 g SETUP 2 33 01 3 USER DIAG Press the 2 key SETUP b The following screen will be displayed 1 ENTER ID REVIEU RECORD 3 RESTORE RECORD 4 NEXT PAGE Press the 3 key RESTORE RECORD c The following screen will be displayed 1 RESTORE RECORD DIRECTORY 3 ERASE RECORDS Press the 1 key RESTORE RECORD d The following screen will be displayed RESTORE RECORD 1 ENTER RECORD NUMBR SCROLL TO SELECT 1 ENTER RECORD NUMBER Press the 1 key ENTER RECORD NUMBER if you know the record numb
15. Contrast key to move to the previous character Press the ENTER key when you are done typing the company name d The following screen will be displayed STATION UP DOWN TO POSITION ENTER TO ACCEPT Type the station name using the alpha numeric keypad and then press the ENTER key WRM 10P AND WRM 40 USER S MANUAL e The following screen will be displayed CIRCUIT UP DOWN POSITION ENTER TO ACCEPT Type the circuit information using the alpha numeric keypad and then press the ENTER key f The following screen will be displayed MANUFACTURER UP DOWN TO POSITION ENTER TO ACCEPT Type the manufacturer name using the alpha numeric keypad and then press the ENTER key g The following screen will be displayed MODEL UP DOWN TO POSITION ENTER TO ACCEPT Type the model information using the alpha numeric keypad and then press the ENTER key h The following screen will be displayed SERIAL NUMBER UP DOWN TO POSITION ENTER TO ACCEPT Type the serial number using the alpha numeric keypad and then press the ENTER key i The following screen will be displayed KVA RATING UP DOWN TO POSITION ENTER TO ACCEPT Type the transformer s KVA rating using the alpha numeric keypad and then press the ENTER key REV3 WRM 10P AND WRM 40 USER S MANUAL j The following screen will be displayed Type the operator s name using
16. Enabling the Computer Interface 2 0 00 01 nennen 53 Salk _Setut gtheDat eamdTiriigu uu uu t OM 54 40 WRNI 10P 40 SPECIAL 55 41 Bypassing Resistance Reading Delay 122 00 11 6 6 nennen 55 4 2 Converting Resistance 56 S0 2 24 Tm 57 WRM 10P AND WRM 40 USER S MANUAL REV3 LIST OF FIGURES Figure 1 WRM 10P Controls and Indicators r 6 Figure 2 WRM 40 Controls and IRdICators uuu eet ue vase bani Qe sve R SE pon te sap s rns 8 Figure 3 100 120 Vac Jumper uuu uq ave cu an a an biro kk e ik aka e ab ala pal 10 Figure 4 200 240 Vac Jumper Settings 10 rigur 5 WRM 10P Relay Location aroze UU Ne UE Sao EUR HU 11 Fie re 6 WRM 40 Relay u raro rtr e d otank E 11 Figure 7 Typical WRM Connections Diagram 1 14 Figure 8 Typical WRM Connections Diagram 2 14 Figure 9 Typical WRM Connections Diagram 15 Figure 10 Typical WRM Connections Diagram 4 15 Figure 11 Typical V
17. OLTAGE Red LED warning indicator light This LED is illuminated when there is PRESENT possibility that voltage exists across the test leads 12 Back lit LCD screen 4 lines by 20 characters Visible in bright light and low light conditions WRM 10P AND WRM 40 USER S MANUAL REV3 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 The voltage is set by placing jumper s on the power terminal block as listed in Table 5 and illustrated in Figure 3 and Figure 4 The relay must also be changed if the voltage settings are changed Please see Figure 5 and Figure 6 for the location of the relays Table 5 Voltage Selection Jumper Settings Voltage Relay Selection Terminal Block Jumpers Part Number 100 120 Vac Brown to Blue and Yellow to Green HE2aN Q AC120V 200 240 Vac Blue to Yellow HE2aN Q AC 240V kai i S E E WA 1 i As 09 595 8 Figure 4 200 240 Vac Jumper Settings m REV3 WRM 10P AND WRM 40 USER S MANUAL Figure 6 WRM 40 Relay Location WRM 10P AND WRM 40 USER S MANUAL 2 2 LCD Screen Contrast Control To increase the LCD screen contrast press and hold the PAPER Contrast key for two seconds To decrease the LCD screen contrast press and hold the PAPER v Contrast key for two seconds 2 3 Printer Paper Control To advance the WRM pri
18. RGIZED Manually run the regulator switch through all the contacts in its range Press the STOP key to end the test The following screen will be displayed if no transient is detected NO TRANSIENT DETECTED The following screen will be displayed if a switch break is detected TRANSIENT DETECTED Press any key to continue The following screen will be displayed PRINT TEST RESULTS 1 YES 0 REV3 WRM 10P AND WRM 40 USER S MANUAL Pressthe 1 key YES to print the test results The test results will be printed and you will be returned to the START UP menu A typical voltage regulator test report is shown in Figure 16 Press the 2 key NO if you do not want to print the test results You will be returned to the START UP menu TEST RESULTS DATE 1006 09 TIME 10 17 56 COMPANY STATION CIRCUIT 98285 RATING OPERATOR TRANSIENT TEST NO TRANSIENT DETECTED FROM TAP TO TAP Figure 16 Typical Transient Test Report WRM 10P AND WRM 40 USER S MANUAL 3 8 Performing a Diagnostic Test In diagnostic mode the WRM can run a resistance test display the sense voltages and test current on the WRM This feature be used to verify the WRM s voltage and current readings against an external meter Use the steps below to perform a diagnostic test a Start from the START UP menu 1 TEST XFMR 11 02 09 g SETUP 2
19. SER S MANUAL 3 0 OPERATING PROCEDURES 3 1 WRM Cable Connections Typical WRM connection diagrams are shown in Figure 7 Figure 8 Figure 9 and Figure 10 AN 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 WARNINGS this warning can result in lethal electric shock to personnel and or damage to the equipment e 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 WRM 10P TRANSFORMER RESISTANCE METER JRL PORS T WX YZ paper 883 WRM 10P TM TRANSFORMER RESISTANCE METER Figure 8 Typical WRM Connections Diagram 2 REV3 WRM 10P AND WRM 40 USER S MANUAL WRM 10P OAMER RESISTANCE MET WRM 10P TRANSFORM RESISTANCE Figure 10 Typical WRM Connections Diagram 4 WRM 10P AND WRM 40 USER S MANUAL 3 2 General Procedures The main steps for using the WRM are outlined below a Ground the WRM to the substation ground 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 t
20. T MODEL WRMLOP SAN 96285 KVA RATING OPERATOR TEST RL 1 841 MILLI OH S R2 17 MICRO OH S TAP WINDING vi 8 V2 TEST Ri 1 841 MILLI OHMS R2 16 MICRO OHMS TAP WINDING V1 V2 TEST Ri 1 842 MILLI OHMS Re 16 MICRO OHMS TAP WINDING amp Ve TEST R1 1 841 MILLI OHMS R2 16 MICRO OHMS TAP A WINDING Figure 13 Typical V1 and V2 Test Report Printout with Multiple Readings REV3 WRM 10P AND WRM 40 USER S MANUAL 3 5 Performing a Load Tap Changer Voltage Regulator Resistance Test The Load Tap Changer Voltage Regulator Resistance Test can be used to conveniently measure the resistance at each tap position Once the number of taps has been entered the WRM will request the user to set the tap position starting with the lower taps then to neutral and then to the raise taps At each tap position the resistance is measured displayed on the LCD screen and stored The WRM then instructs the user to change to the next tap position and repeat the testing process Use the steps below to perform an LTC Voltage Regulator Test a Start from the START UP menu l TEST XFMR 11 02 09 g SETUP 10 33 01 3 USER DIAG Press the 1 key TEST XFMR b The following screen will be displayed VI 8 Ve TEST VI ONLY TEST SPECIAL TEST Vl Ve SPECIAL TEST VI Press the 1 key V1 amp V2 TEST if you would like to perform a V1 amp
21. USER S MANUAL REV3 Figure 2 WRM 40 Controls and Indicators REV 3 WRM 10P AND WRM 40 USER S MANUAL Table 4 Functional Descriptions of WRM 40 Controls and Indicators Item Num be Panel Markings Functional Description 1 VA Voltage sensing channel 1 Female test connector jacks for connecting voltage sensing test leads 2 Vo Voltage sensing channel 2 Female test connector jacks for connecting voltage sensing test leads 3 CURRENT Current Output Female test connector jacks for connecting current test leads Air intake cooling fans The air intake cooling fans maintain the internal 4 temperature There is output air fan the side of the case 240 Vac 2A Input power connector with third wire safety ground rocker toggle 5 50 60 Hz switch with built in fuse protection Fuse 250 Vac Slow Blow 6 GROUND Safety ground This must be connected to station ground before connected the WRM test leads to the transformer 7 Built in 2 5 inch wide thermal printer 9 pin 5 232 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 dil Signal Ground Red LED warning indicator light This LED is illuminated when the WRM is 9 DISCHARGE discharging the stored energy from the transformer Do NOT disconnect test leads when this light is on Failure to heed this warning can result in shock to personnel 10 Rugged membrane keypad 11 HIGH V
22. V2 test Press the 2 key V1 ONLY TEST if you would like to perform a V1 test only The following screen will be displayed LTC or VTG REG 1 YES NO Press the 1 key YES d The following screen will be displayed ENTER OF RAISE TAPS NOT COUNTING NEUTRAL 1 283 Type the number of taps the LTC or Voltage Regulator has using the alpha numeric keypad and then press the ENTER key We will enter 3 for our example LIUM WRM 10P AND WRM 40 USER S MANUAL e The following screen will be displayed 3 LOUER N 3 RAISE IS THIS CORRECT 1 YES NO If the tap information is correct press the 1 key YES and continue to step f If the tap information is incorrect press the 2 key NO and return to step d f Thefollowing screen will be displayed CONVERT READINGS T NTANDARD TEMP 1 YES 0 1 5 Pressthe 1 key YES if you wish to convert readings to standard temperature The following screen will be displayed UINDING MATERIAL COPPER Tk c34 5 5 ALUMINUM Tk ee25 MANUALLY ENTER Tk Press the 1 key COPPER Tk 234 5 to select copper as the winding material Continue to step g Press the 2 key ALUMINUM Tk 225 to select aluminum as the winding material Continue to step g Press the 3 key WANUALLY ENTER Tk to manually enter the Tk value The following screen will be displayed Tk 30 0 C T to adjust T
23. WRM 10P AND WRM 40 USER S MANUAL 3 9 3 Printing a Test Record Directory A directory of all the test records stored in the WRM s Flash EEPROM can be printed on the built in thermal printer using the steps below a Startfrom the START UP menu 1 TEST XFMR 11 02 09 g SETUP 2 33 01 3 USER DIAG Press the 2 key SETUP b The following screen will be displayed 1 ENTER ID REVIEU RECORD 3 RESTORE RECORD 4 NEXT PAGE Press the 3 key RESTORE RECORD c The following screen will be displayed 1 RESTORE RECORD g DIRECTORY 3 ERASE RECORDS Press the 2 key DIRECTORY d The following screen will be displayed PRINT DIRECTORY 1 FULL DIRECTORY SHORT DIRECTORY Press the 1 key FULL DIRECTORY to print the entire directory of test records After the directory is printed you will be returned to the START UP menu Press the 2 key SHORT DIRECTORY to print a short directory This lists the last 10 records stored in the WRM s memory After the directory is printed you will be returned to the START UP menu A typical test record directory printout is shown in Figure 17 WRM 10P AND WRM 40 USER S MANUAL TEST DIRECTORY RECORD NUMBER 3 DATE TIME 11 06 09 09 30 48 NUMBER OF TESTS 1 STATION LAB CIRCUIT MFR ABB MODEL S N 12345 RECORD NUMBER 2 DATE TIME 11 06 09 09 30 NUMBER OF TESTS 2 STATION CIRCUIT
24. WRM 10P and WRM 40 TRANSFORMER WINDING RESISTANCE METERS USER S MANUAL a aa k FE vA A Vanguard Instruments Company Inc Q 1520S Hellman Ave 7 ontario California 91761 USA TEL 909 923 9390 November 2009 FAX 909 923 9391 Revision 3 WRM 10P AND WRM 40 USER S MANUAL SAFETY SUMMARY NOTICE This manual applies to both the WRM 10P and WRM 40 transformer winding resistance 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 the procedures described in this User s Manual may create one or more safety hazards may damage the WRM 10P 40 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 10P 40 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 10P 40 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 10P 40 test unit To ensure that all designed safety
25. ecting the WRM continuity test input across the switching input and running the regulator switch through all the contacts in its range any breaks in continuity caused by faulty tap switching can be detected Please note that the transient test is applicable for the V1 channel only Use the steps below to perform a Transient Test a Start from the START UP menu 1 TEST XFMR 11 02 09 g SETUP 10 33 01 3 USER DIAG Press the 2 key SETUP b The following screen will be displayed 1 ENTER XFMR ID REVIEU RECORD 3 RESTORE RECORD u NEXT PAGE Press the 4 key NEXT PAGE c The following screen will be displayed 1 CONTROL g SET TIME 3 TRANSIENT TEST Press the 3 key TRANSIENT TEST d The following warning screen will be displayed DANGEROUS FLASH OVER WILL OCCUR IF CABLES ARE DISCONNECTED Press any key to continue WRM 10P AND WRM 40 USER S MANUAL The following screen will be displayed TRANSIENT TEST START RUN TEST OR STOP Press the START key The following screen will be displayed CHARGING X PLEASE WAIT x XFMR ENERGIZED The test begins as the magnetic field in the transformer ramps up to a stable plateau The following screen will be displayed when the transformer current stabilizes VOLTAGE REG TEST RUN TAPS XFMR ENE
26. er that you would like to restore The following screen will be displayed RESTORE RECORD NUMBER Type the record number using the alpha numeric keypad and then press the ENTER key n z WRM 10P AND WRM 40 USER S MANUAL REV The following screen will be displayed RECORD RESTORED Press any key Continue to step e SCROLL TO SELECT Press the 2 key SCROLL TO SELECT to scroll through the WRM s record directory and find the record that you would like to restore The following screen will be displayed RECORDS DIRECTORY UP TO SCROLL FWD DUN TO SCROLL RVS Press either the PAPER Contrast or PAPER v Contrast key to scroll through the test record directory The header for each test record will be displayed as shown 1 11 06 09 09 30 NUM OF TESTS 3 ABB Continue to press the PAPER Contrast or PAPER v Contrast key until you have located the test record that you would like to restore Press the ENTER key The following screen will be displayed RECORD RESTORED Press any key Continue to step e REV3 WRM 10P AND WRM 40 USER S MANUAL e The following screen will be displayed 1 SCROLL TEST RECORD Pressthe 1 key SCROLL TEST RECORD to view the test record on the LCD screen Use the PAPER v Contrast key to scroll to the next page Press the STOP key when you are done viewing the test record and you will be returned to the START UP menu 2
27. ewable in bright sunlight and low light levels 2 5 inch wide built in thermal printer Rugged membrane keypad 10 alpha numeric keys 6 function keys Stores 63 test records of 48 readings each One RS 232C 19 200 Baud port Windows XP Vista based software is included with purchase price 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 F to 158 Three 50 foot test cables ground cable power cord and cable bag Transportation case One year on parts and labor WRM 10P AND WRM 40 USER S MANUAL REV3 1 3 WRM Controls and Indicators WRM 10P WRM 40 s 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 Table 3 for the WRM 10P and Table 4 for the WRM 40 The tables describe the function of each item on the control panel 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 WRM 10P TRANSFORMER RESISTANCE METER Figure 1 WRM 10P Controls and Indicators REV 3 WRM 10P AND WRM 40 USER S MANUAL Table 3 Functi
28. 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 lethal electrical shock to personnel and damage to the equipment REV3 WRM 10P AND WRM 40 USER S MANUAL TABLE OF CONTENTS CONVENTIONS USED IN THIS nnns 1 were kote 2 11 General Description and Featur s u em Pop vids 2 1 2 Technical Sp cificeallo Dcuu u u LEN DO ORAS SPP kn oi a ik e ma e qM a at MIO E NU PEE 4 1 2 1 WRM 10P Technical Specifications 0 1 0 0 11 4 1 2 2 WRM 40 Technical Specifications sie ka Da 5 1 3 WRM Controls and 6 2 0 PRETE T ETE cee ne moi ainsi ov sit eti be ie et pe ent E eee a ka Ce re a napas au 10 24 k ayen ksion n dose UNUM dM 10 22 LCD Screen Contrast uyu u ak kt ka tr ka et at a EXIT e pena ko 12 23 Prin
29. hat is to be measured e Turn on the WRM by pressing I on the power rocker switch f Theunit will self calibrate and then you will be presented with the START UP menu as shown below REV3 WRM 10P AND WRM 40 USER S MANUAL 3 3 X 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 1 TEST XFMR 11 02 09 g SETUP 2 33 01 3 USER DIAG Press the 2 key SETUP b The following screen will be displayed ENTER XFMR ID REVIEW RECORD RESTORE RECORD NEXT PAGE Press the 1 key ENTER XFMR ID c The following screen will be displayed COMPANY UP DOWN 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 the 2 key twice To erase the character at the cursor position press the CLEAR key Press the PAPER Contrast key to move to the next character Press the PAPER v
30. ic keypad and then press the ENTER key d The following screen will be displayed CONVERT READINGS T NTANDARD TEMP 1 YES 0 1 5 Press the 1 key YES if you wish to convert readings to standard temperature The following screen will be displayed WINDING MATERIAL 1 COPPER Tk 234 5 ALUMINUM Tk ee25 3 MANUALLY ENTER Tk REV3 WRM 10P AND WRM 40 USER S MANUAL Press the 1 key COPPER Tk 234 5 to select copper as the winding material Continue to step d Press the 2 key ALUMINUM Tk 225 to select aluminum as the winding material Continue to step d Press the 3 key MANUALLY ENTER Tk to manually enter the Tk value The following screen will be displayed Tk 230 0 MED adjust Tk ENTER to accept You can increase the Tk value by 0 5 C increments by pressing the PAPER A Contrast key You can decrease the Tk value 0 5 C increments by pressing the PAPER v Contrast key Press the ENTER key to confirm the temperature setting Continue to step e 2 NO Press the 2 key NO if you do NOT wish to convert readings to standard temperature Continue to step e e following screen will be displayed D U T TEMP g5 D C U F te adjust temp ENTER to accept Use the PAPER Contrast and PAPER v Contrast keys to adjust the D U T Device Under Test temperature Press the ENTER key to confirm the D U T temperature setting
31. k ENTER to accept You can increase the Tk value by 0 5 C increments by pressing the PAPER A Contrast key You can decrease the Tk value by 0 5 C increments by pressing the PAPER v Contrast key Press the ENTER key to confirm the temperature setting Continue to step g 2 NO Press the 2 key NO if you do NOT wish to convert readings to standard temperature Continue to step g REV3 WRM 10P AND WRM 40 USER S MANUAL g The following screen will be displayed Use the PAPER Contrast and PAPER v Contrast keys to adjust the D U T Device Under Test temperature Press the ENTER key to confirm the D U T temperature setting h The following screen will be displayed RE F ER REFERENCE nr nor reference temperature Press the ENTER key to confirm the reference temperature setting h i Thefollowing screen will be displayed DISCONNECTED Press any key to continue j The following screen will be displayed Set the LTC or Voltage Regulator tap position as indicated on the LTC screen and press the START key ON o WRM 10P AND WRM 40 USER S MANUAL k Thefollowing screen will be displayed momentarily CALIBRATING PLEASE WAIT After the WRM finishes its internal calibration the following screen will be displayed XFMR CHARGING PLEASE WAIT I D D3A ENERGIZED x l
32. le in bright sunlight and low light levels 2 5 inch wide built in thermal printer Rugged membrane keypad 10 alpha numeric keys 6 function keys Stores 63 test records of 48 readings each One RS 232C 19 200 Baud port Windows XP Vista based software is included with purchase price 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 F to 158 F Three 50 foot test cables ground cable power cord and cable bag Transportation case One year on parts and labor REV 3 WRM 10P AND WRM 40 USER S MANUAL 1 2 2 WRM 40 Technical Specifications Table 2 WRM 40 Technical Specifications TYPE PHYSICAL SPECIFICATIONS INPUT POWER RESISTANCE READING RANGE ACCURACY TEST VOLTAGE TEST CURRENT RANGE DISPLAY PRINTER KEYPAD INTERNAL TEST RECORD STORAGE COMPUTER INTERFACE PC SOFTWARE SAFETY ENVIRONMENT CABLES OPTIONS WARRANTY Portable transformer winding resistance meter 25 W x 8 5 H x 20 D 63 5 cm x 21 6 cm x 50 cm Weight 44 Ibs 20 kg 100 120 Vac or 200 240 Vac factory pre set 50 60 Hz Please see the voltage setting notes in section 2 1 1 micro ohm 500 ohms 1 19 999 micro ohms 0 5 reading 1 count 20 999 milliohms 1 reading 1 count 1 500 ohms 1 5 reading 1 count 36 Vdc max Auto range 40 Amperes max Back lit LCD Screen 20 characters by 4 lines vi
33. nter paper press and release the PAPER A Contrast key To retract the WRM printer paper press and release the PAPER v Contrast key 2 4 Printer Paper WRM s built in thermal printer uses 2 5 inch 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 Company is highly recommended Additional paper can be ordered from the following sources Vanguard Instruments Co Inc 1520 S Hellman Avenue Ontario CA 91761 Tel 909 923 9390 Fax 909 923 9391 Part Number VIC TP 3 paper BG Instrument Co 13607 E Trent Avenue Spokane WA 99216 Tel 509 893 9881 Fax 509 893 9803 Part Number VIC TP 3 paper REV3 WRM 10P AND WRM 40 USER S MANUAL 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 e Unscrew the two large printer cover screws and remove the printer cover e Remove the leftover thermal paper roll from the paper holder e Unrollthe new thermal paper roll e 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 e Place the paper roll into the paper holder e Lift the thermal head and align the thermal paper if necessary e Re install the printer cover WRM 10P AND WRM 40 U
34. o D U T Check sense leads using an ohmmeter e Perform a diagnostic test See section 3 8 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
35. o as WRM in this manual The exact model number is used only in cases where differences between the units are discussed A key switch or knob on the WRM is indicated as KEY SWITCH KNOB Menu names are referenced as MENU NAME WRM LCD screen output is shown as Important notes are indicated as WRM 10P AND WRM 40 USER S MANUAL 1 0 INTRODUCTION 1 1 General Description and Features The WRM 10P 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 and four wire Kelvin connections provide high accuracy and require no lead compensation The WRM 10P 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 For greater flexibility in the field the WRM 10P comes with a built in 2 5 inch wide thermal printer used for printing test reports Since the WRM 10P can accurately 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 If the transformer winding temperature is entered the WRM 10P
36. onal Descriptions of WRM 10P Controls and Indicators Item Number Panel Markings Functional Description 1 VA Voltage sensing channel 1 Female test connector jacks for connecting voltage sensing test leads 2 Vo Voltage sensing channel 2 Female test connector jacks for connecting voltage sensing test leads 3 CURRENT Current Output Female test connector jacks for connecting current test leads 4 Back lit LCD screen 4 lines by 20 characters Visible in bright light and low light conditions 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 gt a Signal Ground 240 Vac 2 Input power connector with third wire safety ground On Off rocker toggle 6 50 60 Hz switch with built in fuse protection Fuse 250 Vac 3A Slow Blow Safety ground This must be connected to station ground before connected the 7 GROUND WRM test leads to the transformer 8 Built in 2 5 inch wide thermal printer Red LED warning indicator light This LED is illuminated when the WRM is 9 DISCHARGE discharging the stored energy from the transformer Do NOT disconnect test leads when this light is on Failure to heed this warning can result in shock to personnel 10 Rugged membrane keypad 11 HIGH VOLTAGE Red LED warning indicator light This LED is illuminated when there is PRESENT possibility that voltage exists across the test leads WRM 10P AND WRM 40
37. screen as shown below The WRM will continue the test and update the resistance values on the LCD screen While the test is in progress you can press the ENTER key to save the current readings from the LCD screen to the WRM s internal working memory This process be repeated as needed for a maximum of 48 times per test If the ENTER key is pressed the data is saved and the following screen will be displayed on the LCD screen Press the STOP key to stop running the test The test results will be displayed as shown Press any key to continue to the next step l WRM 10P AND WRM 40 USER S MANUAL k Thefollowing screen will be displayed PRINT TEST RESULTS 1 YES NO 1 5 Press the 1 key YES to print the test results on the built in thermal printer The last test results displayed on the LCD screen will be printed Typical WRM test reports are shown in Figure 11 Figure 12 and Figure 13 Continue to step l 2 NO Press the 2 key NO to bypass printing of the test results Continue to step l l Thefollowing screen will be displayed KEEP THIS READING 1 YES NO 1 5 Pressthe 1 key YES to save the reading One of the following screens will be displayed The following screen will be displayed if there is no previous data in the memory TEST SAVED The following screen will be displayed if previous data for the same tes
38. t type is stored in the memory PREVIOUS DATA IN BUF 11 05 08 10 49 08 l APPEND PREV DATA CLEAR PREV DATA The WRM retains the current test results in its working memory When a test is finished the user can append the new test results to the previous test results in the working memory as long as the unit s power has not been turned off between tests Press the 1 key APPEND PREV DATA to append the current test results to the previous test results in the working memory Press the 2 key CLEAR PREV DATA to only save the current test results and discard any previous data from the working memory 20 REV3 WRM 10P AND WRM 40 USER S MANUAL In either case press any key and continue to step m 2 NO If you do not wish to save the reading press the 2 key and continue to step m m The following screen will be displayed RUN ANOTHER TEST 1 YES NO Press the 1 key YES to run another test Return to step b Press the 2 key NO if you do not want to run another test Continue to step n n The following screen will be displayed SAVE THIS RECORD 1 YES NO 1 YES Press the 1 key YES to save the test record Continue to step o 2 NO Press the 2 key NO if you do not want to save the test record The following screen will be displayed ARE YOU SURE DATA UILL BE LOST 1 DO NOT SAVE RECORD g SAVE RECORD Press the 1 key DO NOT SAVE
39. ter Paper COM ak be a a n kk pt a us a ke aa n e n a ne e tea oak ei n 12 20 Printer Pape 12 25 Replacing the Thermal Printer Paper 13 30 OPERATING PROCEDURES 14 WRM Cable EPIRI 14 22 General Procedures deb de 16 3 3 Entering Test Record Header 2 1 44 4 4 17 34 Perormi 8 a Resistance Tegu u 20 3 5 Performing Load Tap Changer Voltage Regulator Resistance 29 3 6 Performing a Special Resistance Test r 36 37 Transient TeSt 41 3 0 Diagnostic Test uu u 44 3 9 Working with Test 45 3 9 1 Restoring a Test Record for Review or Printing 45 3 9 2 Reviewing or Printing a Restored Test Record 48 3 9 3 Printing a Test Record Directory 444 44 4 r 49 394 Erasing Tes RECOS L be trans UU Ll u u ME IU SNNT E 51 3 10
40. 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 3 4 WRM 10P AND WRM 40 USER S MANUAL Performing a Resistance Test Start from the START UP menu Press the 1 key TEST The following screen will be displayed Press the 1 key V1 amp V2 TEST if you would like to perform a V1 amp V2 test Press the 2 key V1 ONLY TEST if you would like to perform a V1 test only Please see section 3 5 for information about performing special tests following menu will be displayed Press the 2 key NO The following screen will be displayed 1 YES Pressthe 1 key YES if you wish to convert readings to standard temperature The following screen will be displayed REV3 WRM 10P AND WRM 40 USER S MANUAL Press the 1 key COPPER Tk 234 5 to select copper as the winding material Continue to step d Press the 2 key ALUMINUM Tk 225 to select aluminum as the winding material Continue to step d Press the 3 key MANUALLY ENTER Tk to manually enter the Tk value The following screen will be displayed Tk 230 0 MED adjust Tk ENTER to accept You can increase the Tk value by 0 5 C increments by pressing the PAPER A Contrast key You can decrease the Tk value 0 5 C increments by pressing the PAPER v Contrast key Press the
41. ve been erased RECORDS ERASED Press any key to return to the START UP menu REV3 WRM 10P AND WRM 40 USER S MANUAL 3 10 Enabling the Computer Interface The Computer Interface Mode is used to transfer test records from the WRM s Flash EEPROM to a PV via the RS 232C port To use this mode first run the provided PC software and then connect the PC to the RS 232C port on the WRM Then follow the steps below to enable the WRM s computer interface a Start from the START UP menu 1 TEST XFMR 11 02 09 g SETUP 2 33 01 3 USER DIAG Press the 2 key SETUP b The following screen will be displayed ENTER XFMR ID REVIEW RECORD RESTORE RECORD NEXT PAGE Press the 4 key NEXT PAGE c The following screen will be displayed 1 COMPUTER CONTROL SET TIME Je VOLTAGE REG TEST Press the 1 key COMPUTER CONTROL d The following screen will be displayed indicating that the WRM s computer interface is enabled COMPUTER ITF MODE Press the STOP key to disable the computer interface mode and return to the START UP menu WRM 10P AND WRM 40 USER S MANUAL 3 11 Setting the Date and Time To set the date and time a Start from the START UP menu 1 TEST XFMR 11 02 09 2 SETUP 2 33 01 3 USER DIAG Press the 2 key SETUP b The following screen will be displayed ENTER ID REVIEW RECORD RESTORE RECORD NEXT PAGE
42. y DO NOT SAVE RECORD if you do not want to save the record You will be returned to the START UP menu Press the 2 key SAVE RECORD to save the record Continue to step l l Thefollowing screen will be displayed Press any key to return to the START UP menu WRM 10P AND WRM 40 USER S MANUAL REC NUMBER 2 TEST RESULTS DATE 11706709 TIME O9 19 08 COMPANY VIC STATION LAB CIRCUIT MFR MODEL WRM1OP SAN 98285 RATING OPERATOR VN 91 amp V2 SPECIAL TEST T 0 MIN R1 499 MICRO OHMS R2 501 MICRO OHMS 5 V2 SPECIAL TEST 1 MIN R1 499 MICRO OHMS R2 500 MICEO OHMS amp V2 SPECIAL TEST T z MIN R1 499 MICRO OHMS Re 500 MICRO OHMS amp Ve SPECIAL TEST T 3 MIN RI _ 499 MICRO OHMS Re 500 MICRO OHMS amp V2 SPECIAL TEST T 4 MIN 499 MICRO OHMS 500 MICRO OHMS amp V2 SPECIAL TEST 5 MIN Ri 499 MICRO OHMS R2 500 MICRO OHMS Figure 15 Typical Five Minute Special Test Report Printout REV3 WRM 10P AND WRM 40 USER S MANUAL 3 7 Performing a Transient Test The transient test verifies that a regulating switch in a Voltage Regulator or Load Tap Changer changes contacts through its selection range without a break in the circuit This is an important test because actual use any break in current in a regulating tap switch generates large reactive voltage spikes that are hazardous and exceed the switch s voltage ratings thus causing irreparable damage By conn
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