LTCA-10™ LTCA-40™ - Vanguard Instruments Company, Inc.
Contents
1. 12 Figure 3 0 Typical Connections to a Load Tap Changer TICE 15 Figure 4 0 Typical LTCA 10 40 Connection Diagram Dynamic Resistance Test 16 Figure 6 0 Typical LTCA 40 Connection Diagram 2 Windings 17 Figure 7 0 Typical LTCA 40 Connection Diagram 3 Windings 18 Figure 8 0 Typical Triple Reading Test Report 2 Figure 9 0 Typical Dual Reading Test Report Printout 2 Figure 10 0 Typical Single Reading Test Report Printout seen 28 Figure 11 0 Typical Single Reading Test Report 34 Figure 12 0 Sample Normal Dynamic LTC Test Plot 40 Figure 13 0 Sample Dynamic LTC Test Expansion Plot 4 Figure 14 0 Typical Test Record 49 Figure 15 0 Typical Record Directory Printout ote be Po eb 51 LIST TABLES Table AO KE Be Te EE 9 Table 2 0 TTC 4 40 EENEG 9 Table 3 0 Functional Descriptions of LTCA 10 Controls and Indicators 11 Table 4 0 Functional Descriptions of LTCA 40 Controls and Indicators 13 LTCA 10 LTCA 40 USER S MANUAL CONVENTIONS USED IN THIS DOCUMENT This document uses the following conventions e or switch on the LTCA 10 40 is indicated as KEY e Menu options are referenced2. I ME Cara 1 ca V1 2 vs NU M EB E Fe oF TESTS ak STAT IT ON gt 22 T rer GI cre if Fes PASTI MODEL L23456 SNM i2345 TFBS L Z34536 F BFO RECORDO NUMB FS 5 T Er T IME Cars Se OS een NR vs TEST NU mM EE OF TESTS STATION gt ez CL At RAFO 4 Cr Cree rir re 6 x F1COLDE L JdL Mt e o v7 amp E3 c SANE L23456 er 1 2343 567 OGO RECORDO NO MBE FS S umo Cara 1 lt lt Va TEST NUMB EF ESS STAT ION 5 22 CPI TRAFO Cr lt MEF s PASTI MODEL 21_ 2 2 h Ee e OSO SAN L23456 FOSO 21 ese Sor Seo RECORDO NUMB dL DAT T I ME C b pm 1 lt gt w L v TEST NUM E F oF TESTS STAT I ON Ar Feat cT cre MEFA PASTI MODEL 1_ 5 495 lt SN L23456 FOSO 3 Z34556 r Ba O Figure 14 0 Typical Record Directory Printout 51 LTCA 10 LTCA 40 USER S MANUAL 5 8 4 Erasing a Test Record Follow the steps below to erase a single test record or the entire directory of test records from the LTCA 10 40 s Flash EEPROM a Start from the START UP menu 1 TEST XFMR 03 04 09 SETUP 09 28 03 3 USER DIAG Press the 2 key SETUP
3. Me oo 21 434 35 Pun APZB TRAFO 4 GI CPK COMPANY STATI ON FeCCLIUIOE Y MEF PASTI MODEL L23456 lt gt SN L23456 lt AL SE e lt KVA RTG Lo MVA OFRERATOR FA ec X vL LTO TEST TEST EDO AT AMPS Z000 Fiz SeMPLE RAT E RESISTANCE PLOT MARKERS AT Loo mt INTERVALS VANGUARD INSTRUMENT CO INC U 94 cC 2 LTCA 10 REV 0 94 1 ONTARIO 91761 USA TEL 909 923 9390 FAX 909 923 9391 VANGUARD INSTRUMENTS SERIAL NUMBER 43001 Figure 12 0 Sample Dynamic LTC Test Expansion Plot 41 LTCA 10 LTCA 40 USER S MANUAL 5 7 Diagnostic Mode In diagnostic mode the LTCA 10 40 can run a resistance test display the sense voltages and test current on the LTCA This feature can be used to verify the LTCA 10 40 s voltage and current readings against an external meter Use the steps below to initiate a diagnostic test a Start from the START UP menu 1 TEST XFMR 03 04 09 SETUP 09 28 03 3 USER DIAG Press the 3 key USER DIAG b The SELECT TEST CURRENT menu will be displayed SELECT TEST CURRENT SELECT TEST CURRENT 1 1 AMP 1 1 5 AMPS 5 AMPS 3 10 AMPS 3 10 AMPS 4 AMPS LTCA 10 LTCA 40 Select the test current by pressing the 1 2 3 or
4. DAT E Lem ee sm Figure 8 0 Typical Dual Reading Test Report Printout 2 LTCA 10 LTCA 40 USER S MANUAL T EST RESULT S Daa T s a T I ME hts aS 221 COMPANY ST ent I OP C IFCCLIICT 2 T CF EmU I VALENT RESI STANCE heart A MHEAS T T m 2S OC ee REF T EMF Ts BS OC Laas cap COFFEE NOI NGS T ke Zag SC FS Ps m emm em C T oes TE gt J 1 m em or EN ire oe en S A OMNE u TEST TESTEO AT SS AMPS R1 7 261 MILLI OHMS Ris 8 940 MILLI OHMS TAP 1 TE NOI PG Figure 9 0 Typical Single Reading Test Report Printout 28 LTCA 10 LTCA 40 USER S MANUAL 5 5 Performing a Special Resistance Test The Special Resistance Test is used to conduct a resistance test for a pre defined period ranging from to 45 minutes The resistance data 15 recorded at 1 minute intervals Use the following procedures to perform a Special Resistance Test a Start from the START UP menu 1 TEST XFMR 03 04 09 SETUP 09 28 03 3 USER DIAG Press the 1 key TEST XFMR to start a test b The following menu will be displayed 1 RESISTANCE TEST SPECIAL RESISTANCE TEST 3 DYNAMIC LTC TEST Press the 2 key SPECIAL RESISTANCE TEST to start a special resistance test c The following menu will be displayed l
5. The PRINT TEST RESULTS menu will be displayed PRINT TEST RESULTS 1 YES NO l YES 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 LTCA 10 40 test reports are shown in Figure 7 0 Figure 8 0 and Figure 9 0 Continue to step m 2 NO Press the 2 key NO to bypass the printing of the test results Continue to step m m The KEEP THIS READING menu will be displayed KEEP THIS READING l YES NO YES If you wish to save the reading press the 1 key YES One of the following screens will be displayed The following screen will be displayed if there 15 no previous data in the memory 24 LTCA 10 LTCA 40 USER S MANUAL The following screen will be displayed if previous data for the same test type is stored in the memory PREVIOUS DATA IN BUF 03 01 09 10 30 l APPEND PREV DATA CLEAR PREV DATA The LTCA 10 40 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 If data exists in the working memory you will be presented with the PREVIOUS DATA IN BUF menu shown above Press the 1 key to append the current test results to the previous test results in the working
6. CHEN T I ME z A6 ZO OS FJ G U em I MST RUMENT STAT I Om FACT oF CIRCUIT 22345678390 mer GE MODEL 22343567890 SN 1 gt FC SEN FTG Fe aT OF HAr 1 OPL Y TEST Ri 10 610 MILLI OHMS T AFAL NOI PIC ONIY TEST TESTEO eat Ri 10 612 MILLI OHMS T F I MG wi TEST Teas Teo AMPS R1 10 613 MILLI OHMS TAP I NDO LMG Figure 13 0 Typical Test Record Printout 49 LTCA 10 LTCA 40 USER S MANUAL 5 8 3 Printing the Test Record Directory A directory of all the test records stored in the LTCA 10 40 s Flash EEPROM can be printed on the thermal printer using the steps below a Start from the START UP menu 1 TEST XFMR 03 04 09 SETUP 09 28 03 3 USER DIAG Press the 2 key SETUP b The following menu will be displayed ENTER XFMR ID PRINT RECORD SAVE RESTORE RECORD SET TIME SET FONT Press the 3 key SAVE RESTORE RECORD c The following menu will be displayed 1 RESTORE RECORD SAVE RECORD RECORD DIRECTORY 4 ERASE RECORD Press the 3 key RECORD DIRECTORY d The following menu will be displayed PRINTINT DIRECTORY l FULL DIRECTORY SHORT DIRECTORY 1 FULL DIR
7. ENTER key The RESTORING RECORD screen will be displayed momentarily RESTORING RECORD Continue to step e 47 2 LTCA 10 LTCA 40 USER S MANUAL SCROLL TO SELECT Press the 2 key if you want to scroll through the LTCA 10 40 s record directory to find the record number The RECORDS DIRECTORY screen will be displayed RECORDS DIRECTORY TO SCROLL FWD DUN TO SCROLL RVS Press the PAPER Contrast key to show the first record header in memory The first record header will be displayed 9 03 12 09 l5 22 NUM OF TESTS 3 Continue to press the PAPER Contrast and PAPER v Contrast keys to find the desired record Press the ENTER key to load restore the desired record The RESTORING RECORD screen will be displayed momentarily RESTORING RECORD Continue to step e e Once a record has been restored the following screen will be displayed RECORD RESTORED PRINT RECORD l YES NO YES Press the 1 key YES to print the restored record The printer will print the selected record and the display will return to the START UP menu once printing 15 completed See figure 13 0 for a typical test record printout NO Press the 2 key NO if you do not wish to print the restored record The display will return to the START UP menu 48 LTCA 10 LTCA 40 USER S MANUAL RECORD NUMBER 12 TEST RESULT S DATE Came EH
8. Typical Connections to a Load Tap Changer ICH 15 Sa 16 oM MEE EE Procedure NE 19 54 a Resistance T 68L emis nentes dou a nndis 20 oL Resistance Test Result Primus en Em du 27 3 5 Performing special Resistance ete oe ub ENER 29 2 9 1 Special Resistance Test Result oae eng fv p ve tese ved e 34 3 0 Pedom d Dynamic LIC toten 35 5 6 1 Dynamic LTC Test Result Printouts 40 Sur 1A OTIOSTIC MOS essendo E et E I tM Me DM ERU UE 42 5 SOUP bead 44 50 1 Butennbihe Transformer IL eee teta a es ns UM 44 282 RSO me E RECO d opto deos xen 47 3 90 Artie the Test Record Directory ee 50 Erasmo a IeStRECON 52 5 0 55 Ine 54 22050 the Date ecrit vies read vi adt a et i tud vla 55 3 5 Setting the Test Value Display 56 JO SPECIAL EE NEI A E EE 57 6 1 Bypassing the Resistance Value Display Delai 57 6 2 Resistance E E En EE 57 LTCA 10 LTCA 40 USER S MANUAL LIST OF FIGURES Figure LO ETC A TO Controls and EEN 10 Figure 2 0 LTCA 40 Controls and
9. None LTC Control DISCHARGE HIGH VOLTAGE PRESENT None RS 232C V1 V2 V3 CURRENT l I RAISE LOWER LTC CONTROL Functional Description Clamp on AC current probe connector USB Interface port The air intake cooling fans maintain the internal temperature There are output air fans on the sides of the case Input power connector with third wire safety ground ON OFF rocker toggle switch with built in fuse protection 5 16 18 threaded stud with hand turned wing nut safety ground This must be connected to station ground before connecting LCTA 40 test leads to the transformer USB Flash Drive Interface Port Built in 4 5 inch wide thermal printer NOTE For best printing results it is recommended that only VIC thermal paper be used Liquid Crystal Display 64 x 128 dot graphic display Back lit and viewable in bright sunlight and low light conditions Displays menus user selections status readouts and test results Load Tap Changer Control Allows the user to change the Load Tap Changer position using the RAISE and LOWER buttons Red LED indicator light When lit this indicator warns the operator that the LTCA 40 is discharging the stored energy in the transformer Do not disconnect test leads when this light is on Failure to heed this warning can result in shock to personnel Red LED indicator light Lights to warn operator that there is a possibility that voltage exists across test leads Do not disconn
10. as MENU OPTION e Screen and menu names are referenced as SCREEN MENU NAME e LTCA 10 40 LCD screen output is shown as e Important notes are indicated as LTCA 10 LTCA 40 USER S MANUAL 1 0 INTRODUCTION 11 General Description The Vanguard LTCA 10 and LTCA 40 are microprocessor controlled winding resistance meters These devices are designed to accurately measure large transformer winding resistance motor winding resistance or the resistance of large inductive devices This manual addresses the LTCA 10 and LTCA 40 as one device Any differences between the LTCA 10 and LTCA 40 are addressed separately The LTCA 10 uses a 60Vdc 10 Amperes Direct Current DC power supply while the LTCA 40 uses a 60VDC 40 Amperes DC power supply Both devices are capable of reading winding resistances ranging from 1 micro ohm to 500 ohms Three voltage sensing channels allow the LTCA 10 40 to read three resistance values in the same test To ensure operator safety the LTCA 10 40 automatically discharges the stored energy the transformer at the end of each test The LTCA 10 40 has one resistance reading channel V1 dedicated for dynamic resistance testing The dynamic resistance test feature can be used to monitor the transformer LTC or Voltage Regulator contact resistance while changing tap positions A resistance plot shows the transformer LTC contact and winding resistance and can be used to detect LTC Voltage Regulator contact probl
11. current through the test load Press the ENTER key to proceed to the next step The LTC TEST screen will be displayed with the relevant test current value selected in step d 10 START TO RUN TEST OR STOP TO ABORT If you have made any errors or would like to abort the test press the STOP key and you will be returned to the START UP menu Press the START key to run the test The following screen will be displayed momentarily CALIBRATING PLEASE WAIT After LTCA 10 40 finishes its internal calibration the XFMR CHARGING screen will be displayed XFMR CHARGING PLEASE WAIT x XFMR ENERGIZED This 1s only an informational screen to remind the operator that a test 1s 1n progress The display duration of this message depends on the size of the winding s inductance and the test current selected The LTCA 10 40 determines when the resistance reading 1s stable and displays the READY TO CAPTURE DATA screen READY TO CAPTURE DATA PRESS ENTER OR LTC RAISE LOUER T NTART TIMING XFMR ENERGIZED 36 LTCA 10 LTCA 40 USER S MANUAL Press the ENTER key to start capturing data for the time period selected in step e The LTC must be manually started to begin switching through the taps If the LTC cable 15 connected then pressing the LTC RAISE key when cycling from lower to higher taps or pressing the LTC LOWER key when cyclin
12. key 1 2 to select the expansion type EXPANSION PRINT menu will be displayed EXPANSION PRINT START TIME D 5 END TIME D S Enter the START time and press the ENTER key Enter the END time and press the ENTER key The RESISTANCE PLOT RANGE menu will be displayed RESISTANCE PLOT RANGE l FULL RANGE L0DUQ LOmQ mQ 100mQ l mO 10 100mQ 100 10 2000 select the resistance plot range by pressing the corresponding key on the LTCA 10 40 s keypad 2 4 5 or 6 The printer will begin the print the expansion plot A time expansion plot from 17 0 seconds to 18 00 seconds and resistance scale from 100 milli ohms to 10 ohms 15 shown in figure 12 0 When printing is completed you will be returned to the PRINT AN EXPANSION PLOT menu and offered the option to print another expansion Return to step i NO Press the 2 key NO if you do not wish to print an expansion Continue to step 38 LTCA 10 LTCA 40 USER S MANUAL j The SAVE THIS RECORD menu will be displayed SAVE THIS RECORD 1 YES If you wish to save the record press the 1 key YES and continue to step k 2 NO If you do not wish to save the record press the 2 key VO The following message will be displayed Press the 1 key 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
13. memory Press the 2 key to only save the current test results and discard any previous data from the working memory In either case press the ENTER key and continue to step n NO If you do not wish to save the reading press the 2 key NO and continue to Step n n The RUN ANOTHER TEST menu will be displayed RUN ANOTHER TEST 1 YES NO 2 YES If you would like to run another test press the 1 key YES and return to step If you not wish to run another test press the 2 key VO and continue to Step The SAVE THIS RECORD menu will be displayed SAVE THIS RECORD 1 YES NO NOTE The test record must be saved to Flash EEPROM so that it can be recalled and printed at a later time 25 LTCA 10 LTCA 40 USER S MANUAL 1 YES If you wish to save the record press the 1 key YES and continue to step p 2 NO If you do not wish to save the record press the 2 key NO The following message will be displayed ARE YOU SURE DATE WILL BE LOST 1 DO NOT SAVE RECORD SAVE RECORD Press the 1 key 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 p p The following message will be displayed RECORD NUMBER 01 HAN BEEN SAVED Press the ENTER key to return to the START UP menu 26 LTCA 10 LT
14. only by Vanguard Instruments Company factory personnel or by an authorized repair service Unauthorized modifications can cause safety hazards and will void the manufacturer s warranty WARNING Do not remove test leads during a test Failure to heed this warning can result in electrical shock to personnel and damage to the equipment LTCA 10 LTCA 40 USER S MANUAL TABLE OF CONTENTS CONVENTIONS USED IN THIS EE 5 TO N anne ere orate bitu eee eee 6 Wel General USO TTE 6 12 Funcional Desci EE 6 E gt B rnisled A CCESSOLICS 7 20 TECHNICAL SPECIFICATIONS 9 ZA BLICA 10 Technical Specifications 9 222 9 20 i deitate ds 10 3 1 LTCA 10 Controls and Indyeatorg 10 3 2 LICA A40 Controls and IndicatOEs ceo E DEM M Sei 12 40 E RE ER EE 14 Al Operitine 14 42 LTCA 10 40 LEDC Con oll E 14 25 ELCAO 40 Printer Paper E TEE 14 AA Ae 14 50 ORERATING PROCEDURES ee 15 5
15. 04 AMPS 7 0878 XFMR ENERGIZED When the pre defined test time has elapsed the TEST RESULTS screen will be displayed TEST RESULTS 1 04 AMPS 7 285 mQ The number of resistance values shown will depend on the number channels chosen in step c NOTE Press the ENTER key The SAVE THIS RECORD menu will be displayed SAVE THIS RECORD 1 YES NO LTCA 10 LTCA 40 USER S MANUAL 1 YES If you wish to save the record press the 1 key YES and continue to step m 2 NO If you do not wish to save the record press the 2 key VO The following message will be displayed Press the 1 key 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 m m The following e will be displa ed Press the ENTER key to return to the START UP menu 33 LTCA 10 LTCA 40 USER S MANUAL 5 5 1 Special Resistance Test Result Printout RECORD NUMBER 57 TEST PRESUL TS oes T oS 7 eS oS T I mE L3 i O COMANN FA ST aT Tori FF C IFCCLHICY T EAr GI cre rir r PASTI FACADEEL Lisa sa SS ES cS zn 4223234350 TRA 1 3455 e So Ee TA Lo MVA are OF ECCAQLIJT KL EStAT RESISTANCE DO T HEAS TEM Tm 25 FF OF ZEF T Em
16. 4 LTCA 40 only key c The following WARNING screen will be displayed KKKKKKKKKWARNINGKKKKKKKXKX DANGEROUS FLASH OVER WILL OCCUR IF CABLES ARE DISCONNECTED KK KKK KKK KKK KKK KKK KK KKK KX This warning reminds the operator that the next sequence of test steps will run current through the test load Press the ENTER key to proceed to the next step d The following screen will be displayed USER DIAG TEST START TO RUN TEST OR STOP TO ABORT If you wish to abort the diagnostic test press the STOP key and you will be returned to the START UP menu Press the START key to run the diagnostic test 42 LTCA 10 LTCA 40 USER S MANUAL e The V2 and V3 test currents will be displayed as shown below O 53mV 8 3 09 1l2mV 01 091A Press the STOP key to end the diagnostic test and return to the START UP menu 1 43 LTCA 10 LTCA 40 USER S MANUAL 5 8 Setup Menu The setup menu is used to configure the LTCA 10 40 and to also recall and print stored test records This section outlines the procedures for accessing and using the Setup Menu options 5 8 1 Entering the Transformer ID Transformer information can be entered using the steps outlined below a Start from the START UP menu 1 TEST XFMR 03 04 09 SETUP 09 24 03 3 USER DIAG Press the 2 key SETUP b The following menu will be displayed ENTER XFMR ID P
17. 7 te adjust Tk ENTER to accept You can increase the Tk value by 0 5 C increments by pressing the PAPER 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 your temperature selection Continue to step f 2 NO If you do NOT wish to convert readings to standard temperature press the 2 key NO and continue to step h f After the Tk value has been selected the D U T TEMP screen will be displayed D U T TEMP 25 0 7 9 TH ee adjust temp ENTER to accept Use the PAPER Contrast and PAPER v Contrast keys to adjust the D U T temperature Press the ENTER key to confirm the temperature selection D U T is short for Device Under Test NOTE The REFERENCE TEMP screen will be displayed REFERENCE TEMP 55 07 185 0 F 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 temperature selection 21 LTCA 10 LTCA 40 USER S MANUAL LTCA 10 40 will calculate the equivalent resistance value at this new temperature NOTE The following WARNING screen will be displayed DANGEROUS FLASH OVER WILL OCCUR IF CABLES ARE DISCONNECTED This warning remind
18. AG Press the 1 key TEST XFMR to start a test b The following menu will be displayed 1 RESISTANCE TEST SPECIAL RESISTANCE TEST DYNAMIC LTC TEST Press the 1 key RESISTANCE TEST to start a resistance test c The following menu will be displayed 1 Vh Vea V3 RES TEST Ve RES TEST 3 V1 ONLY RES TEST select the number of channels that will be used to measure resistance by pressing the corresponding numeric key 1 2 or d The SELECT TEST CURRENT menu will be displayed SELECT TEST CURRENT SELECT TEST CURRENT 1 1 AMP 1 1 AMP 5 AMPS 5 AMPS 3 10 AMPS 3 10 AMPS 4 AMPS LTCA 10 LTCA 40 Select the test current by pressing the 1 2 3 or 4 1 40 only key e The CONVERT READINGS TO STANDARD TEMP menu will be displayed as shown below CONVERT READINGS TO STANDARD TEMP 1 YES NO YES If you wish to convert readings to standard temperature press the 1 key YES The WINDING MATERIAL menu will be displayed WINDING MATERIAL 1 COPPER Tk e34 5 ALUMINUM Tk e25 0 MANUALLY ENTER Tk 20 LTCA 10 LTCA 40 USER S MANUAL a Press the 1 key to select copper as the winding material Continue to step f b Press the 2 key to select aluminum as the winding material Continue to step f c Press the 3 key to manually enter the Tk value The following screen will be displayed Tk 230 0
19. ANUAL The RATING screen will be displayed KVA RATING T L TO POSITION ENTER TO ACCEPT Enter the transformer s KVA rating by using the LTCA 10 40 s alpha numeric keypad and then press the ENTER key The OPERATOR screen will be displayed OPERATOR T L TO POSITION ENTER TO ACCEPT Enter the name of the operator by using the LTCA 10 40 s alpha numeric keypad and then press the ENTER key You will be returned to the START UP menu 46 LTCA 10 LTCA 40 USER S MANUAL 5 8 2 Restoring a Test Record Use the following steps to restore a test record from the LTCA 10 40 s Flash EEPROM to the unit s working memory a Start from the START UP menu 1 TEST XFMR 03 04 09 SETUP 09 28 03 3 USER DIAG Press the 2 key SETUP b The following menu will be displayed ENTER XFMR ID PRINT RECORD SAVE RESTORE RECORD SET TIME SET FONT Press the 3 key SAVE RESTORE RECORD c The following menu will be displayed 1 RESTORE RECORD SAVE RECORD 3 RECORD DIRECTORY 4 ERASE RECORD Press the 1 key RESTORE RECORD d The RESTORE RECORD menu will be displayed RESTORE RECORD 1 ENTER RECORD NUMBER SCROLL TO SELECT ENTER RECORD NUMBER Press the 1 key if you know the record number The following screen will be displayed RESTORE RECORD NUMBER Enter the record number using the LTCA 10 40 s keypad and then press the
20. B Flash Drive Interface Port Air Vents Input power connector with third wire safety ground ON OFF rocker toggle switch with built in fuse protection 5 16 18 threaded stud with hand turned wing nut safety ground This must be connected to station ground before connecting LCTA 10 test leads to the transformer Built in 4 5 inch wide thermal printer NOTE For best printing results it is recommended that only VIC thermal paper be used Liquid Crystal Display 64 x 128 dot graphic display Back lit and viewable in bright sunlight and low light conditions Displays menus user selections status readouts and test results Load Tap Changer Control Allows the user to change the Load Tap Changer position using the RAISE and LOWER buttons Red LED indicator light When lit this indicator warns the operator that the LTCA 10 is discharging the stored energy in the transformer Do not disconnect test leads when this light is on Failure to heed this warning can result in shock to personnel Red LED indicator light Lights to warn operator that there is a possibility that voltage exists across test leads Do not disconnect test leads when this light is on Failure to heed this warning can result in shock to personnel Membrane keypad 10 alpha numeric keys and 6 function keys START STOP CLEAR ENTER and CONTRAST PAPER positioning UP and DOWN 9 pin RS 232C interface port female DB type Data rate is set to 19 200 baud 1 start bit 2 sto
21. CA 40 USER S MANUAL 5 4 1 Resistance Test Result Printouts TEST RESULT S DATE lt Lao COMP sri STAT ION EF TRAFO 4 Cat Crete MF rAaST 1 Modo eL E e e lt Sm Lesa 5 67 82990 142342567394 EY A eT OFFERAT OF 2 EUI VALENT RESISTANCE DATA MEAS T EmN T m OC ere REF T Em Ts OS OC Leas oF ALUMI MOMMA LJI TDI NGS CT oe Le S F m ES ren emm em C T o gt 2 Tee A TK a g i Ub m p F orm re e Le oan c3 Vi VS Y3 TEST TESTED AT Aen AMES R1 285 MILLI OHMS Ris 9 033 MILLI OHMS MICRO OHMS Res 64 MICRO OHMS RS 37 MICRO OHMS RSs 46 MICRO OHMS TAF LIT NO I Gi or TT oS 1S CHE T I ME LA 55S 051 Figure 7 0 Typical Triple Reading Test Report Printout 2 TEST RESULT S pa s ECH EH Corr erie ST aT CCP C IFECCLOT T mir Fe AT OF EST RES I STANCE PATE HEAS TSM Tm 25 CAE TT OF REF CT EE T Bs OC 165s oF COPPER WINDINGS Tke FS em ren emm E T m Te 3 0 T onm Y iol eat tame T or EN em Lor cham jC SEO Wut TEST TESTEO aT 5 AMPS F1 7 260 MILLI OHMS Ris 8 939 MILLI OHMS Re 59 MICRO OHMS Res r3 MICRO OHMS T AALI I MNO
22. ECTORY Press the 1 key FULL DIRECTORY to print the entire directory of test records After the directory 1s printed the display will return to the START UP menu A typical directory printout is shown in figure 14 0 2 SHORT DIRECTORY Press the 2 key SHORT DIRECTORY to print a short directory listing This lists the last 12 records store in the LTCA 10 40 s memory After the directory is printed the display will return to the START UP menu A typical directory printout is shown in figure 14 0 50 LTCA 10 LTCA 40 USER S MANUAL TEST D L RECT RECORDO NUMBER Sr DAT T I ME Cc 1 lt 2 ONL ei SPEC I AL TEST NU MEB E OF TESTS STAT Iri ON AP ZE TRAFO a Sr CPK MEFE PASTI MODEL 225 4 Ee roo S Ni 1 22 5 40 er lt 1 25 4 5 6 7 RECORDO Sa T I ME Cara 1 lt gt MI ONL Y SPECIAL NUMB E F or TESTS STATION Fr IE C Ir2cCcULT T Ferca GI E rar res MODEL 123456 TY S Ni FOSO 21 Z34536 E C O R O MUMS F DAT EET Tre oo 19 oCsS A e b P EE vs Gr ECG TESS NUMBER rF TEDT S STATION FL E TRAFO I CPK MFF PAST IL MODEL Sech 56 e BO S M L23456 e Ve 1234356 er O RECORD NUMBaeF S54
23. PTIONS WARRANTY Table 1 0 LTCA 10 Specifications Load tap changer analyzer 21 W x 9 H x 17 D 53 cm x 24 cm x 43 cm Weight 33 Ibs 15 4 kg 100 240 Vac 50 60 Hz 1 micro ohm 500 ohms 1 19 999 micro ohms 0 5 reading 1 count 20 999 milli ohms 1 reading 1 count 1 500 ohms 1 5 reading 1 count Three static resistance reading channels One dynamic resistance channel 60 Vdc max 1 ampere 5 amperes 10 amperes Clamp on current sensor 1 20 Amperes AEMC model MN106 Back lit LCD Screen 64 x 128 dot graphic viewable in bright sunlight and low light levels 4 5 inch wide thermal printer One USB Flash drive interface port stores up to 999 test records on a USB Flash drive not included One RS 232C port One USB port Stores up to 128 static resistance test records 48 tests per record and 11 dynamic resistance test records 240 Vac 1A Designed to meet UL 61010 1 and CAN CSA 22 2 No 1010 1 92 standards Operating 10 C to 50 C 15 F to 122 F Storage 30 C to 70 C 22 F to 158 F One 50 foot current cable set Three 50 foot resistance cable sets One ground cable One USB cable One RS 232C cable One current sense cable One LTC control cable power cord cable bag Transportation Case One year on parts and labor 2 2 LTCA 10 LTCA 40 USER S MANUAL LTCA 40 Technical Specifications TYPE PHYSICAL SPECIFICATIONS OPERATING VOLTAGE RESI
24. RINT RECORD SAVE RESTORE RECORD SET TIME 5 SET FONT Press the 1 key ENTER XFMR ID c The COMPANY screen will be displayed COMPANY T L TO POSITION ENTER TO Enter the utility company s name by using the LTCA 10 40 s alpha numeric keypad and then press the ENTER key 44 LTCA 10 LTCA 40 USER S MANUAL The STATION screen will be displayed STATION T L TO POSITION ENTER TO ACCEPT Enter the station name by using the LTCA 10 40 s alpha numeric keypad and then press the ENTER key The CIRCUIT screen will be displayed CIRCUIT T L TO POSITION ENTER TO ACCEPT Enter the circuit name by using the LTCA 10 40 s alpha numeric keypad and then press the ENTER key The MANUFACTURER screen will be displayed MANUFACTURER T L TO POSITION ENTER TO ACCEPT Enter the transformer manufacturer name by using the LTCA 10 40 s alpha numeric keypad and then press the ENTER key The MODEL screen will be displayed MODEL T L TO POSITION ENTER TO ACCEPT Enter the transformer model name number by using the LTCA 10 40 s alpha numeric keypad and then press the ENTER key The SERIAL NUMBER screen will be displayed SERIAL NUMBER T L TO POSITION ENTER TO ACCEPT Enter the transformer s serial number by using the LTCA 10 40 s alpha numeric keypad and then press the ENTER key 45 LTCA 10 LTCA 40 USER S M
25. S 232C cable One current sense cable One LTC control cable power cord cable bag Transportation Case One year on parts and labor LTCA 10 LTCA 40 USER S MANUAL 3 0 CONTROLS AND INDICATORS 3 1 LTCA 10 Controls and Indicators The LTCA 10 s controls and indicators are shown in Figure 1 0 below A leader line with an index number points to each control and indicator which 1s cross referenced to a functional description in Table 3 0 The table describes 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 LTCA 10 40 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 LTCA 10 080723LTC10AV662B 12 11 10 9 8 Figure 1 0 LTCA 10 Controls and Indicators 10 Item Number 1 2 3 4 10 11 12 13 14 15 16 17 LTCA 10 LTCA 40 USER S MANUAL Table 3 0 Functional Descriptions of LTCA 10 Controls and Indicators Panel Markings AC Current USB Flash Drive None 120 240 7 5A 50 60 Hz Fuse 250Vac 1A Fast Blow GROUND None None LTC Control DISCHARGE HIGH VOLTAGE PRESENT None RS 232C V1 V2 V3 CURRENT I RAISE LOWER LTC CONTROL Functional Description Clamp on AC current probe connector USB Interface Port US
26. STANCE READING RANGE ACCURACY RESISTANCE CHANNELS TEST VOLTAGE TEST CURRENTS AC CURRENT PROBE DISPLAY PRINTER EXTERNAL DATA STORAGE COMPUTER INTERFACES INTERNAL TEST RECORD STORAGE LOAD TAP CHANGER CONTACT SAFETY ENVIRONMENT CABLES OPTIONS WARRANTY Table 2 0 LTCA 40 Specifications Load tap changer analyzer 25 W x 8 5 x 20 D 63 5 cm x 21 6 cm x 50 cm Weight 46 Ibs 20 kg 100 240 Vac 50 60 Hz 1 micro ohm 500 ohms 1 19 999 micro ohms 0 5 reading 1 count 20 999 milli ohms 1 reading 1 count 1 500 ohms 1 5 reading 1 count Three static resistance reading channels One dynamic resistance channel 60 Vdc max 1 ampere 5 amperes 10 amperes 40 amperes Clamp on current sensor 1 20 Amperes AEMC model MN106 Back lit LCD Screen 64 x 128 dot graphic viewable in bright sunlight and low light levels 4 5 inch wide thermal printer One USB Flash drive interface port stores up to 999 test records on a USB Flash drive not included One RS 232C port One USB port Stores up to 128 static resistance test records 48 tests per record and 11 dynamic resistance test records 240 Vac 1A Designed to meet UL 61010A 1 and CAN CSA C22 2 No 1010 1 92 standards Operating 10 C to 50 C 15 F to 122 Storage 30 C to 70 C 22 F to 158 F One 50 foot current cable set Three 50 foot resistance cable sets One ground cable One USB cable One R
27. Te S85 0cc 165 OF COPPE WINDINGS Te 2354 Sc Fla ren em em lt C T T T mee 2 1 m em emm c ire oa T ESTECO arr FE Fr e E FAI e I Corre FIL es B FGG onmMsS CATAL re CF EC I eat TEST Tela MI TESS ESCH TT aL lem Leg Fe 1 u SS raATL L I COCu rm F 1 om E ILL I SPECIAL TEST T MIN gt zi erp FE W 2 HILL I 0K KNS es FAIL L I sf COP ze SPECI al TEST T 225 err TESTED AT AMP W I eS mri LI B aer MILLI TESTEO AT are F oQ 3 MILLE ee et 1 em _ soa CDE e SPECIAL TEST T wm ER MIN TESTEO rT L ee 1 e E ei O HSPs PS i em mI Co Im Figure 10 0 Typical Single Reading Test Report Printout 34 LTCA 10 LTCA 40 USER S MANUAL 5 6 Performing a Dynamic LTC Test The Dynamic LTC Test is used to conduct a resistance test while the LTC or Regulator 1s switching taps The test time can be selected for a period from 15 to 240 seconds to allow the LTC or Regulator enough time to switch through all of its taps during the test The resistance data is recorded continuously during the test period Th
28. Tk value by 0 5 C increments by pressing the PAPER 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 your temperature selection Continue to step 9 2 NO If you do NOT wish to convert readings to standard temperature press the 2 key NO and continue to step i g After the Tk value has been selected the D U T TEMP screen will be displayed D U T TEMP 205 07 77 O F H ee adjust temp ENTER to accept Use the PAPER Contrast and PAPER v Contrast keys to adjust the D U T temperature Press the ENTER key to confirm the temperature selection 30 LTCA 10 LTCA 40 USER S MANUAL The REFERENCE TEMP screen will be displayed REFERENCE TEMP 55 07 185 09 ters 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 temperature selection LTCA 10 40 will calculate the equivalent resistance value at this new temperature NOTE 1 The following WARNING screen will be displayed DANGEROUS FLASH OVER WILL OCCUR IF CABLES ARE DISCONNECTED X KKK KKK KKK KKK KKK KKK KKK KKK This warning reminds the operator that the next sequence of test steps will run current through the test load Press the ENTER key to proceed to
29. USER S MANUAL for the LTCA 10 LTCA 40 LOAD TAP CHANGER ANALYZER Vanguard Instruments Company Inc 1520 S Hellman Ave Ontario California 91761 TEL 909 923 9390 August 2015 FAX 909 923 9391 Rev 2 3 LTCA 10 LTCA 40 USER S MANUAL SAFETY SUMMARY NOTICE This manual applies to both the LTCA 10 and LTCA 40 The operating procedures are virtually the same for both models and any differences are clearly described within the step by step procedures 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 LTCA 10 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 LTCA 10 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 LTCA 10 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 LTCA 10 40 test unit To ensure that all designed safety features are maintained it is highly recommended that repairs be performed
30. Vh Vera SPEC TEST Ve SPEC TEST 3 V1 ONLY SPEC FES Select the number of channels by pressing the corresponding key 1 2 or d The ENTER SPECIAL TEST TIME MINUTES screen will be displayed ENTER SPECIAL TEST TIME MINUTES 1 55 10 Enter the test time between 1 45 minutes using keypad on the LTCA 10 40 and then press the ENTER key Ten 10 minutes 15 used for the test time in this example e The SELECT TEST CURRENT menu will be displayed SELECT TEST CURRENT SELECT TEST CURRENT 1 1 AMP 1 AMP 5 AMPS 5 AMPS 3 10 AMPS LO AMPS 40 AMPS LTCA 10 LTCA 40 Select the test current by pressing the 1 2 3 or 4 LTCA 40 only key f The CONVERT READINGS TO STANDARD TEMP menu will be displayed CONVERT READINGS TO STANDARD TEMP 1 YES NO LTCA 10 LTCA 40 USER S MANUAL YES If you wish to convert readings to standard temperature press the 1 key YES The WINDING MATERIAL menu will be displayed WINDING MATERIAL 1 COPPER Tk e234 5 ALUMINUM Tk e25 0 MANUALLY ENTER Tk a Press the 1 key to select copper as the winding material Continue to Step 6 b Press the 2 key to select aluminum as the winding material Continue to Step 6 c Press the 3 key to manually enter the Tk value The following screen will be displayed Tk 30 0 C ee adjust Tk ENTER to accept You can increase the
31. b The following menu will be displayed ENTER XFMR ID PRINT RECORD SAVE RESTORE RECORD SET TIME SET FONT Press the 3 key SAVE RESTORE RECORD c The following menu will be displayed 1 RESTORE RECORD SAVE RECORD 3 RECORD DIRECTORY 4 ERASE RECORD Press the 4 key ERASE RECORD d The ERASE RECORD menu will be displayed ERASE RECORD 1 ERASE SINGLE RECORD ERASE ALL RECORDS EXIT Press the STOP key if you would like to end the process and return to the START UP menu Otherwise select one of the menu options described below 1 ERASE SINGLE RECORD Press the 1 key ERASE SINGLE RECORD to erase a single record You will be presented with the following screen ERASE RECORD NUMBER XX 52 LTCA 10 LTCA 40 USER S MANUAL Enter the number of the record to erase and then press the ENTER key The following screen will be displayed to confirm that the record was deleted RECORD NUMBER ERASED Press the ENTER key and you will be returned to the beginning of step d 2 ERASE ALL RECORDS Press the 2 key ERASE ALL RECORDS to erase all records stored in the LTCA 10 40 s memory The following confirmation screen will be displayed ERASE ALL RECORDS ARE YOU SURE ENTER TO CONTINUE Press the STOP key to cancel the process and return to the START UP menu Press the ENTER key to erase all test records The followin
32. e AC current probe can be clamped around one of the motor leads to monitor the motor current during the test Use the following steps to perform a Dynamic LTC Test a Start from the START UP menu 1 TEST XFMR 03 04 09 SETUP 09 28 03 3 USER DIAG Press the 1 key TEST XFMR to start a test b The following menu will be displayed 1 RESISTANCE TEST SPECIAL RESISTANCE TEST DYNAMIC LTC TEST Press the 3 key DYNAMIC LTC TEST to start a dynamic LTC test c The following menu will be displayed SELECT SHOT TIME SECONDS SECONDS SECONDS SECONDS SECONDS Select the shot time by pressing the corresponding key on the LTCA 10 40 s keypad 11 2 3 4 or 5 d The SELECT TEST CURRENT menu will be displayed as shown below The LTCA 10 offers a selection of 5 or 10 Amps while the LTCA 10 offers a selection of 10 or 40 AMPS SELECT TEST CURRENT SELECT TEST CURRENT l 5 AMPS 1 10 AMPS 10 AMPS 40 AMPS LTCA 10 LTCA 40 Select the test current by pressing the corresponding key on the LTCA 10 40 s keypad or 2 35 LTCA 10 LTCA 40 USER S MANUAL The following WARNING screen will be displayed DANGEROUS FLASH OVER WILL OCCUR IF CABLES ARE DISCONNECTED This warning reminds the operator that the next sequence of test steps will run
33. ect test leads when this light is on Failure to heed this warning can result in shock to personnel Membrane keypad 10 alpha numeric keys and 6 function keys START STOP CLEAR ENTER and CONTRAST PAPER positioning UP and DOWN 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 Signal RX TX Signal Ground Voltage sensing input channels 1 2 amp 3 Female test connector jacks for connecting test current output test leads Fuse for LTC Control Raise leads Fuse for LTC Control Lower leads Load Tap Changer controller connector 13 LTCA 10 LTCA 40 USER S MANUAL 4 0 PRE TEST SETUP 4 1 Operating Voltages The LTCA 10 40 s operating voltages are 100 240 Vac and 50 60 Hz 4 2 LTCA 10 40 LCD 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 4 3 LTCA 10 40 Printer Paper Control To advance the LTCA 10 40 printer paper press and release the PAPER Contrast key To retract the LTCA 10 40 printer paper press and release the PAPER v Contrast key 44 LTCA 10 40 Printer Paper The LTCA 10 40 s built in thermal printer uses 4 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 Van
34. ects the test values displayed during testing and does not affect any other text such as menu items Use the steps below to set the test value font a Start from the START UP menu 1 TEST XFMR 03 04 09 SETUP 09 28 03 3 USER DIAG Press the 2 key SETUP b The following menu will be displayed ENTER XFMR ID PRINT RECORD SAVE RESTORE RECORD SET TIME SET FONT Press the 5 key SET FONT c The SELECT TEST FONT menu will be displayed SELECT TEST FONT 1 NORMAL FONT BOLD FONT 1 NORMAL FONT Press the 1 key NORMAL FONT to select the normal font The screen will return to the START UP menu 2 BOLD FONT Press the 2 key BOLD FONT to select the bold font The screen will return to the START UP menu 56 LTCA 10 LTCA 40 USER S MANUAL 6 0 LTCA 10 40 SPECIAL FEATURES 6 1 Bypassing the Resistance Value Display Delay When LTCA 10 40 first applies the test voltage to the transformers winding the current 15 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 LTCA 10 40 has a built in 3 minute minimum delay between the start of the test and when the resistance value 15 displayed on the LCD This feature eliminates the possibility of early erroneous readings Depending on the transformer size the delay may be longer than 3 m
35. ems The transformer LTC or Voltage Regulator AC motor current can also be monitored by the LTCA 10 40 using an AC clamp on the current sensor This feature can be used to monitor the LTC motor On Time at each tap change operation The LTCA 10 40 1s rugged portable and easy to use requiring little training for first time users A 16 key membrane keypad 15 used to control the unit The LTCA 10 40 features a back lit LCD screen 64 x 128 dot graphic that 15 viewable bright daylight as well as low light conditions A built in thermal printer can print results on 4 5 inch wide thermal paper The LTCA 10 40 can store 128 static test records 48 tests per record and 11 dynamic resistance test records in Flash EEPROM Test records can be recalled locally or transferred to a PC via the available interfaces RS 232C port USB port USB Flash drive port A built in USB Flash drive interface provides a convenient method for transferring test records to or from a USB Flash drive Test records can also be transferred directly to a PC via the RS 232C or USB interface ports If using a USB Flash drive test records stored 1n the LTCA 10 40 s internal memory can be transferred to the drive and then the supplied PC software can be used to view the test records stored on the drive Up to 999 test records can be stored on a USB Flash drive 1 2 Functional Description The LTCA 10 40 s operation 1s based on the electrical relationship described by Ohm
36. g from higher to lower taps will start capturing data The following screen will be displayed indicating that the test 15 in progress RUNNING DYNAMIC 15 RL 7 3 4 mQ STOP KEY ABORT XFMR ENERGIZED When the pre defined test time has elapsed the STOP key is pressed the PRINT TEST RESULTS menu will be displayed PRINT TEST RESULTS 1 YES NO 1 YES Press the 1 key YES to print the test results on the built in thermal printer The following menu will be displayed SELECTIPLOTTIYPE 1 NORMAL PLOT EXPANDED PLOT 1 NORMAL PLOT Press the 1 key VORMAL PLOT to print a normal plot The printer will begin to print A typical normal full scale plot is shown in figure 11 0 Continue to step i 2 EXPANDED PLOT To print an expanded plot press the 2 key EXPANDED PLOT Continue to step i 2 NO Press the 2 key NO to bypass the printing of the test results Continue to step 37 LTCA 10 LTCA 40 USER S MANUAL 1 The PRINT AN EXPANSION PLOT menu will be displayed PRINT AN EXPANSION PLOT 1 YES NO l YES An expansion plot graphs the resistance waveform in more detail by allowing the selection of a timeframe to be plotted using an appropriate resistance scale Press the 1 key YES to print an expansion plot The following menu will be displayed 1 EXPANDED TIME 8 RES 2 EXPANDED RES ONLY Press the corresponding
37. g screen will be displayed showing a progress bar ERASING RECORDS PLEASE WAIT Once all records have been erased the following screen will be displayed RECORDS ERASED Press the ENTER key to return to the START UP menu 53 LTCA 10 LTCA 40 USER S MANUAL 5 8 5 Enabling the Computer Interface The Computer Interface Mode 15 used to transfer test records from the LTCA 10 40 s Flash EEPROM to a PC via the RS 232C or USB port To use this mode first run the provided PC software and then connect the PC to the RS 232C or USB port on the LTCA 10 40 The software will automatically make the connection to the LTCA 10 40 54 5 8 6 Setting the Date and Time a Start from the START UP menu 1 TEST XFMR 03 04 09 SETUP 09 28 03 3 USER DIAG Press the 2 key SETUP b The following menu will be displayed ENTER XFMR ID PRINT RECORD SAVE RESTORE RECORD SET TIME SET FONT Press the 4 key SET TIME c The following screen will be displayed ENTER MM DD YY HH MM SS LTCA 10 LTCA 40 USER S MANUAL Type in the Date and Time using the alpha numeric keypad When the complete date and time has been typed in the display will immediately return to the START UP menu 55 LTCA 10 LTCA 40 USER S MANUAL 5 8 7 Setting the Test Value Display Font The font used to display test values on the screen can be made bold for better visibility This only aff
38. gs to prevent an accidental flash over WARNING 16 LTCA 10 LTCA 40 USER S MANUAL JUMPER Figure 5 0 Typical LTCA 40 Connection Diagram 2 Windings 17 LTCA 10 LTCA 40 USER S MANUAL 080727LTCA40V663F JUMPER JUMPER Figure 6 0 Typical LTCA 40 Connection Diagram 3 Windings 18 5 3 LTCA 10 LTCA 40 USER S MANUAL General Procedures Ground the LTCA 10 40 to substation ground Item 6 in Figure 1 0 Item 5 in figure 2 0 A WARNING Always connect the LTCA 10 40 to the substation ground before connecting test leads to any transformer bushing Failure to follow this procedure may damage the LTCA 10 40 Plug the LTCA 10 40 power cable into a power outlet Insert current cable plugs and voltage sensing cable plugs into their respective control panel jacks Attach test cable clamps to the transformer terminals for the winding that 1s to be measured Turn on the LTCA 10 40 power by pressing I on the rocker switch Once the power 15 turned on the unit will perform self calibration and display a few start up messages Once the short start up sequence is completed the START UP menu will be displayed date and time will obviously be different 1 TEST XFMR 03 04 09 SETUP 09 28 03 3 USER DIAG 19 LTCA 10 LTCA 40 USER S MANUAL 5 4 Performing a Resistance Test a Start from the START UP menu 1 TEST XFMR 03 04 04 SETUP 09 28 03 3 USER DI
39. guard Instruments Company 1s 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 909 923 939 Part Number VIC TP 4 paper BG Instrument Co 13607 E Trent Avenue Spokane WA 99216 Tel 509 893 9881 Fax 509 893 9803 Part Number VIC TP 4 paper 14 LTCA 10 LTCA 40 USER S MANUAL 5 0 OPERATING PROCEDURES The LTCA 10 40 15 simple to operate and only requires the selection of choices from display menus and responding to displayed prompts However first time operators should review the following operating procedures to become familiar with all LTCA 10 40 operations and the logical branching for various test options More experienced operators may use these procedures as a handy help and reference guide 5 1 Typical Connections to a Load Tap Changer LOWER RAISE Figure 3 0 Typical Connections to a Load Tap Changer LTC 15 LTCA 10 LTCA 40 USER S MANUAL 5 2 Cable Connections terminal while high current is being conducted during a test Failure to heed this warning can result in electrical shock to personnel and or damage to the WARNING equipment Do not touch or disconnect any test lead that is connected to a transformer Figure 4 0 Typical LTCA 10 40 Connection Diagram Dynamic Resistance Test A After discharge always disconnect test clips slowly from transformer bushin
40. inutes The operator can bypass this delay and observe the test results immediately To bypass this delay press the 9 key the 8 kev and the 7 key from the START UP menu The LTCA 10 40 will then begin displaying resistance values as soon as measurements are made This bypass setting will remain active until the unit 15 turned off When the unit 1s turned on again it will use the default 3 minute minimum delay before displaying resistance values 6 2 Converting Resistance Measurements The LTCA 10 40 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 15 accomplished by the following formula Rs Rm Ts Tk Tm Tk Where Rs 15 the resistance at desired temperature Rm 15 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 57 LTCA 10 LTCA 40 USER S MANUAL 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 LTCA 10 40 User s Manual e Version 2 3 e August 24 2015 Copyright 2015 by Vanguard Instruments Company Inc 58
41. istance values on the LCD screen as follows TEST IN PROGRESS I 1 04 AMPS RL 7 272 mQ Re 35auQ x XFMR ENERGIZED x The LTCA 10 40 will continue the test and update the resistance values on the LCD screen While the test is in progress the ENTER key can be pressed to save the current reading on the LCD to the LTCA 10 40 s internal working memory This feature is very convenient for storing multiple readings during a test A typical example of this application is an LTC or Voltage Regulator contact resistance test where multiple readings are required For example the user can start the test at one tap position and when the reading 15 stable press the ENTER key to save the reading Then the user can change the tap position and save the stable reading at the new tap position by pressing the ENTER key This process can be repeated as needed for a maximum of 48 times per test record If the ENTER key is pressed the data is saved and the SAVING TEST message will be displayed on the LCD as shown below TEST IN PROGRESS SAVING sess 1 09 AMPS 7 272 5 58 XFMR ENERGIZED 23 LTCA 10 LTCA 40 USER S MANUAL Once the data is saved the TEST SAVED message will be displayed TEST IN PROGRESS 22 1 04 AMPS 7 272 mQ 358uQ XFMR ENERGIZED k Press the STOP key to stop running the test Press the STOP key a second time to continue to the next step
42. key SAVE RECORD to save the record Continue to step k k The following message will be displayed m A T Aenea M D 3 ECORD NUMBER me gem 8 3 fm ry ITA A JE T JL L L lt gt n IA A gt 19 Press the ENTER key to return to the START UP menu 39 LTCA 10 LTCA 40 USER S MANUAL 5 6 1 Dynamic LTC Test Result Printouts RECORD NUMBER 47 ESLL DATE gt oo gt Tze oo L4 35 COMPANY STATION FP IE EZIXIFECCLII Y TRAFO CPK MEF PASTI r1ODE L LeosaSoroavoa Sm 1 2254 lt lt gt 1 225 425 6 gt KYA FTG Lo MYA OFPFRERATOR HAr WV LTG TEST TESTED BAT AMPS Z20009 SAMPLE RA AT EZ RESISTANCE PLOT MARKERS AT Acco mt rINTERYAL S T EA D I 070 07 SS L IN ru Wee EI 0 91 81 0701 0 6 y 0761 VANGUARD INSTRUMENT LTCA 10 REV 0 94 200 1520 5 HELLMAN AVE ONTARIO CA 91761 USA TEL1C909 5 923 9390 FAX 909 923 9391 URNGURRD INSTRUMENTS COM SERIAL NUMBER 43001 INC 8 Figure 11 0 Sample Normal Dynamic LTC Test Plot 40 LTCA 10 LTCA 40 USER S MANUAL RECORD NUMBER 47 DATE 2 lt
43. p bits 8 data bits and no parity bit Signal Ground Voltage sensing input channels 1 2 and 3 Female test connector jacks for connecting test current output test leads Fuse for the LTC Control Raise leads Fuse for the LTC Control Lower leads Load Tap Changer controller connector 11 LTCA 10 LTCA 40 USER S MANUAL 3 2 LTCA 40 Controls and Indicators The LTCA 40 s controls and indicators are shown in Figure 2 0 below A leader line with an index number points to each control and indicator which 15 cross referenced to a functional description in Table 4 0 The table describes 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 LTCA 10 40 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 SERIAL MADE IN U S A Vanguard Instruments A3 Inc Ontario California USA 080723LTCA40V662B 12 11 10 9 8 Figure 2 0 LTCA 40 Controls and Indicators 12 Item Number 1 2 3 10 11 12 13 14 15 16 17 LTCA 10 LTCA 40 USER S MANUAL Table 4 0 Functional Descriptions of LTCA 40 Controls and Indicators Panel Markings AC Current USB None 120 240 7 5A 50 60 Hz Fuse 250Vac 1A Fast Blow GROUND Flash Drive None
44. 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 1s calculated by dividing the measured voltage by the current which 1s calculated by the microprocessor Calculated resistance readings are then displayed on the unit s back lit LCD screen A special current source allows the LTCA 10 to output 1 5 and 10 Amperes of test current The LTCA 40 can output 5 10 or 40 Amperes of test current For added safety the current source LTCA 10 LTCA 40 USER S MANUAL circuit is thermally protected Also a built in discharge circuit automatically discharges the stored energy in the transformer at the end of each test 1 3 Furnished Accessories The LTCA 10 40 is furnished with eight 50 foot test cables with quick disconnect type test plugs on the unit end and battery type clamps at the test load end One power cord one ground cable one current sense cable one LTC operation cable and a cable carrying bag 15 also included 2 0 2 1 LTCA 10 LTCA 40 USER S MANUAL TECHNICAL SPECIFICATIONS LTCA 10 Technical Specifications TYPE PHYSICAL SPECIFICATIONS OPERATING VOLTAGE RESISTANCE READING RANGE ACCURACY RESISTANCE CHANNELS TEST VOLTAGE TEST CURRENTS AC CURRENT PROBE DISPLAY PRINTER EXTERNAL DATA STORAGE COMPUTER INTERFACES INTERNAL TEST RECORD STORAGE LOAD TAP CHANGER CONTACT SAFETY ENVIRONMENT CABLES O
45. s the operator that the next sequence of test steps will run current through the test load Press the ENTER key to proceed to the next step 1 One of the following menus will be displayed with the relevant test current value depending on how many channels were selected in step c Vl TEST ONLY Vl 8 Ve TEST l AMP TEST l AMP TEST START TO RUN TEST START TO RUN TEST OR OR STOP TO ABORT STOP TO ABORT V1 Test Only V1 amp V2 Test Vl Vea 8 V3 TEST l AMP TEST START TO RUN TEST OR STOP TO ABORT V1 V2 amp V3 Test If you have made any errors or would like to abort the test press the STOP key and you will be returned to the START UP menu Press the START key to run the test The following screen will be displayed momentarily CALIBRATING PLEASE WAIT 22 LTCA 10 LTCA 40 USER S MANUAL After the LTCA 10 40 finishes its internal calibration the XFMR CHARGING screen will be displayed XFMR CHARGING PLEASE WAIT XFMR ENERGIZED 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 and the test current selected You can bypass this delay and observe the resistance value immediately See section 6 1 for instructions on how to select this option NOTE The LTCA 10 40 determines when the resistance reading 15 stable and displays the res
46. the next step jJ One of the following menus will be displayed with the relevant test current value depending on how many channels were selected in step Vl TEST ONLY V1 amp V2 TEST l AMP TEST l AMP TEST START TO RUN TEST START TO RUN TEST OR OR STOP TO ABORT STOP TO ABORT V1 Test Only V1 amp V2 Test 1 Vea 8 V3 TEST l AMP TEST START TO RUN TEST OR STOP TO ABORT V1 V2 amp V3 Test If you have made any errors or would like to abort the test press the STOP key and you will be returned to the START UP menu 31 LTCA 10 LTCA 40 USER S MANUAL Press the START key to run the test The following screen will be displayed momentarily CALIBRATING PLEASE WAIT After the LTCA 10 40 finishes its internal calibration the XFMR CHARGING screen will be displayed XFMR CHARGING PLEASE WAIT XFMR ENERGIZED This is only an informational screen to remind the operator that a test 15 in progress The display duration of this message depends on the size of the winding s inductance and the test current selected You can bypass this delay and observe the resistance value immediately See section 6 1 for instructions on how to select this option NOTE k The LTCA 10 40 determines when the resistance reading is stable and shows the resistance value on the LCD as follows the first line shows the remaining test time REMAINING 10 00 1
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