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WRM-10P AND WRM-40 USER’S MANUAL

REV 3

 

56

 

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 

 

Содержание WRM-10P

Страница 1: ...CE METERS USER S MANUAL Vanguard Instruments Company Inc 1520 S Hellman Ave Ontario California 91761 USA TEL 909 923 9390 FAX 909 923 9391 November 2009 Revision 3 Advanced Test Equipment Rentals www...

Страница 2: ...ng 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...

Страница 3: ...3 2 General Procedures 16 3 3 Entering Test Record Header Information 17 3 4 Performing a Resistance Test 20 3 5 Performing a Load Tap Changer Voltage Regulator Resistance Test 29 3 6 Performing a Sp...

Страница 4: ...5 Figure 11 Typical V1 Test Report Printout 26 Figure 12 Typical V1 and V2 Test Report Printout 27 Figure 13 Typical V1 and V2 Test Report Printout with Multiple Readings 28 Figure 14 Typical LTC Volt...

Страница 5: ...ual 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 NAM...

Страница 6: ...minum 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...

Страница 7: ...h 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 A Windows XP Vista based software application is provide...

Страница 8: ...ISPLAY Back lit LCD Screen 20 characters by 4 lines viewable in bright sunlight and low light levels PRINTER 2 5 inch wide built in thermal printer KEYPAD Rugged membrane keypad 10 alpha numeric keys...

Страница 9: ...reen 20 characters by 4 lines viewable in bright sunlight and low light levels PRINTER 2 5 inch wide built in thermal printer KEYPAD Rugged membrane keypad 10 alpha numeric keys 6 function keys INTERN...

Страница 10: ...nctional 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 obviou...

Страница 11: ...start bit 2 stop bits 8 data bits and no parity bit Pin Signal 2 RX 3 TX 5 Signal Ground 6 240 Vac 2A 50 60 Hz Fuse 250 Vac 3A Slow Blow Input power connector with third wire safety ground On Off rock...

Страница 12: ...WRM 10P AND WRM 40 USER S MANUAL REV 3 8 Figure 2 WRM 40 Controls and Indicators...

Страница 13: ...oggle switch with built in fuse protection 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 print...

Страница 14: ...k 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...

Страница 15: ...REV 3 WRM 10P AND WRM 40 USER S MANUAL 11 Figure 5 WRM 10P Relay Location Figure 6 WRM 40 Relay Location...

Страница 16: ...release the PAPER Contrast key 2 4 Printer Paper The 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...

Страница 17: ...l 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 Li...

Страница 18: ...al 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 t...

Страница 19: ...3 NOTE The 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 sinc...

Страница 20: ...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 te...

Страница 21: ...he 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...

Страница 22: ...ormation using the alpha numeric keypad and then press the ENTER key h The following screen will be displayed Type the serial number using the alpha numeric keypad and then press the ENTER key i The f...

Страница 23: ...following screen will be displayed 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 me...

Страница 24: ...special tests NOTE The test current is 10 Amps for the WRM 10P and 40 Amps for the WRM 40 c The following menu will be displayed Press the 2 key NO d The following screen will be displayed 1 YES Press...

Страница 25: ...NTER 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 The following screen will be...

Страница 26: ...y to run the test i The following screen will be displayed momentarily After the WRM finishes its internal calibration the following screen will be displayed This is only an informational screen to re...

Страница 27: ...multiple readings when testing a Load Tap Changer LTC or Voltage Regulator a more convenient method is also available Please see section 3 5 for information about performing an LTC or Voltage Regulato...

Страница 28: ...if there is no previous data in the memory The following screen will be displayed if previous data for the same test type is stored in the memory The WRM retains the current test results in its workin...

Страница 29: ...ontinue to step n n The following screen will be displayed 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 f...

Страница 30: ...26 o The following screen will be displayed NOTE The record number is automatically assigned and incremented by the WRM Press any key to return to the START UP menu Figure 11 Typical V1 Test Report Pr...

Страница 31: ...REV 3 WRM 10P AND WRM 40 USER S MANUAL 27 Figure 12 Typical V1 and V2 Test Report Printout Measured Resistance Equivalent Resistance at Reference Temperature...

Страница 32: ...WRM 10P AND WRM 40 USER S MANUAL REV 3 28 Figure 13 Typical V1 and V2 Test Report Printout with Multiple Readings...

Страница 33: ...eat the testing process Use the steps below to perform an LTC Voltage Regulator Test a Start from the START UP menu Press the 1 key TEST XFMR b The following screen will be displayed Press the 1 key V...

Страница 34: ...5 to select aluminum as the winding material Continue to step g Press the 3 key MANUALLY ENTER Tk to manually enter the Tk value The following screen will be displayed You can increase the Tk value by...

Страница 35: ...setting NOTE The WRM will calculate the equivalent resistance value at this new temperature Please see section 4 2 for further information about how this value is calculated i The following screen wi...

Страница 36: ...will be displayed momentarily n After saving the readings the following screen will be displayed Set the LTC or Voltage Regulator tap position to the position indicated on the LCD screen and press the...

Страница 37: ...st results Continue to step p p The following screen will be displayed 1 YES Press the 1 key YES to save the test record The following screen will be displayed Press any key to return to the START UP...

Страница 38: ...0P AND WRM 40 USER S MANUAL REV 3 34 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 RECORD NUMBER 01 HAS BEEN S...

Страница 39: ...REV 3 WRM 10P AND WRM 40 USER S MANUAL 35 Figure 14 Typical LTC Voltage Regulator Test Report Printout...

Страница 40: ...cial resistance test Press the 4 key SPECIAL TEST V1 to perform a V1 special resistance test c The following screen will be displayed Enter the test time between 1 to 45 minutes using the alpha numeri...

Страница 41: ...NTER 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 The following screen will be...

Страница 42: ...remind the operator that a test is in progress The display duration of this message depends on the size of the winding s inductance NOTE You can bypass this delay and observe the resistance value imme...

Страница 43: ...t 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 The following screen will be displayed NOTES The record number is aut...

Страница 44: ...WRM 10P AND WRM 40 USER S MANUAL REV 3 40 Figure 15 Typical Five Minute Special Test Report Printout...

Страница 45: ...nning 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 ch...

Страница 46: ...nually 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 The following screen will be...

Страница 47: ...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 re...

Страница 48: ...art from the START UP menu Press the 3 key USER DIAG b The following warning screen will be displayed Press any key to continue c The following screen will be displayed Press the START key d The V1 V2...

Страница 49: ...creen will be displayed Press the 1 key RESTORE RECORD d The following screen will be displayed 1 ENTER RECORD NUMBER Press the 1 key ENTER RECORD NUMBER if you know the record number that you would l...

Страница 50: ...Press either the PAPER Contrast or PAPER Contrast key to scroll through the test record directory The header for each test record will be displayed as shown Continue to press the PAPER Contrast or PA...

Страница 51: ...rned 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...

Страница 52: ...RECORD c The following screen will be displayed 1 SCROLL TEST RECORD Press the 1 key SCROLL TEST RECORD to view the test record on the LCD screen Use the PAPER Contrast key to scroll to the next page...

Страница 53: ...en will be displayed 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 DIRECTO...

Страница 54: ...WRM 10P AND WRM 40 USER S MANUAL REV 3 50 Figure 17 Typical Test Record Directory Printout...

Страница 55: ...The following screen will be displayed Press the 3 key ERASE RECORDS d The following screen will be displayed NOTE You can cancel the erase process by pressing the STOP key 1 ERASE SINGLE REC Press th...

Страница 56: ...2 key ERASE ALL RECORDS to erase all records stored in the WRM s Flash EEPROM The following screen will be displayed If you would like to cancel the process press the STOP key Press the ENTER key to...

Страница 57: ...rface a Start from the START UP menu Press the 2 key SETUP b The following screen will be displayed Press the 4 key NEXT PAGE c The following screen will be displayed Press the 1 key COMPUTER CONTROL...

Страница 58: ...screen will be displayed Press the 2 key SET TIME d The following screen will be displayed Type in the date and time using the alpha numeric keypad When the complete date and time has been entered you...

Страница 59: ...ity 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 bypas...

Страница 60: ...nt 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...

Страница 61: ...nt cable connection Opened transformer windings Check current cable connection Perform a quick test using a shunt or a piece of aluminum bar Resistance reading is zero or invalid while current value i...

Страница 62: ...20 S Hellman Ave Ontario CA 91761 USA Phone 909 923 9390 Fax 909 923 9391 www vanguard instruments com Copyright 2009 by Vanguard Instruments Company Inc WRM 10 User s Manual Revision 2 0 June 5 2009...

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