LTCA-10™ LTCA-40™
Contents
1. 21 Figure 10 0 Typical Single Reading Test Report 28 Figure 11 0 Typical Single Reading Test Report Printout eee RM 34 Figure 12 0 Sample Normal Dynamic LTC Test 0 40 Figure 13 0 Sample Dynamic LTC Test Expansion 1 2 1 41 Figure 14 0 Typical Test Record Printout Ael d 49 Figure 15 0 Typical Record Directory 004404 51 LIST OF TABLES Table TTC AS T0 008 8 Table 2 0 LT CAc40 001110 0106 22 08 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 A key or switch on the LTCA 10 40 is indicated as KEY e Menu options are referenced as MENU OPTION e Screen and menu names are referenced as SCREEN MENU NAME 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 1 1 General Description The Vanguard LTCA 10 and LTCA 40 are microprocessor controlled winding resistance meters These devices are designed to accurately me2. orl TEST TESTEO AT 5 AMPS R1 7 261 MILLI OHMS Ris 8 940 MILLI OHMS Tar I MNG E al um T CE 1 43 S21 Figure 10 0 Typical Single Reading Fieport Printout 28 LTCA 10 LTCA 40 USER S MANUAL 5 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 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 DYNAMIC TEST Press the 2 key SPECIAL RESISTANCE TEST to start a special resistance test c The following menu will be displayed l Vh Vea 59 lt TEST Ve SPEC CIES 3 V1 ONLY Select the number of channels by pressing the corresponding key 111 2 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 the keypad on the LTCA 10 40 and then press the ENTER key Ten 10 minutes is used for the test time in this example e The SELECT TE
3. gt 5 1 gt KVA TGS CFEF2E TOF Het Va LTC TEST TESTED AT AMPS SeMPLE RAT Fiza RESISTANCE PLOT MARKERS AT Loo mt INTERVALS 4 eu Ww wd T 072 1 6 21 VANGUARD IDEE cn INC REU 94 2008 520 6909 gt 553 525 e d 923 9391 VANGUARD INSTRUMENTS SERIAL NUMBER 43001 Figure 13 0 Sample Dynamic LTC Test Expansion Plot 41 LTCA 10 LTCA 40 USER S MANUAL 58 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 gef AMPS 10 AMPS 4 5 10 AMPS 4 40 AMPS LTCA 10 LTCA 40 Select the test current pressing the 1 2 or 4 1 40 only key c The following WARNING screen will be displayed DANGEROUS FLASH OVER WILL OCCUR IF CABLES ARE
4. FE 41 240 FATLOL OU C3aubdodzs F 1 FAILOL Cer 1 1 Al An T rit TESTED AT Arr 2 I 0K Kns 1 E gt Luft TEST T HII TESTED AT AMP Fx ZEE i 25 MILL 1 WI SPECIAL TEST MI TESTED AT 4 AMPE i MILL I 0OHMS 1 _ I ONLY SPECIAL T MIN TESTEO rT L ee Fe L L L 1 23 MILLI Figure 11 0 Typical Single Reading Test Report Printout 34 LTCA 10 LTCA 40 USER S MANUAL 5 7 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 The 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 USE
5. Y RAFC A gar rir gt MODEL 1255 507 SN 1554 2455 3 gt lt gt 1 7 lt gt RECORDO MNLUUTIT EEF OAT oS 2 1 NR vos TEST NUM ev TESTS STATI FON cy Rees T RAFO gt mire Fe ras Tx F1COLDE L 1225 4 L23456 7390 041 2343 567 gt lt gt RECORDO DAT T IT ME lt 1 lt Va T 1 51 NUMB ar ES T S STAT I ON APZ CIrIRCEHIT TRAFO Gr MEF PASTI MODEL L22345 7 3 L23456 gt Z34566 lt gt RECORDO 0 1 1 DAT T I ME OSA 1 lt gt 1 TEST NUMB EF oF SS STAT I ON CIRCUIT TrFrFo cc MEF PASTI 5 lt TY gt lt gt 5 gt 1l Z34556 r SS Figure 15 0 Typical Record Directory Printout 51 LTCA 10 LTCA 40 USER S MANUAL 5 9 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 04 SETUP 09 28 03
6. Press the ENT EX key to erase all test records The following 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 9 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 04 5 9 6 Setting the Date and Time Start from the START UP menu 1 TEST XFMR 03 09 09 SETUP 09 28 03 3 USER DIAG Press the 2 key SETUP The following menu will be displayed ENTER XFMR ID PRINT RECORD SAVE RESTORE RECORD SET TIME SET FONT Press the 4 key SET TIME The following screen will be displayes ENTER MM DD YY 1 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 9 7 Setting the Test Value Display Font The font used to display test values
7. 25 ntu MEN EI I MM MM EM 22 5 9 5 Enabling the Comiputer Interface iri ett rie te ede tv bn denos 54 2920 Semne the Date and Dre aa vet etta d deua co et 55 3597 wetune the Test Value Display eens 56 I LTCONSIOMOSSPECPALIBEATURPBS 57 6 1 Bypassing the Resistance Value Display Delay essere 57 6 2 Converting Resistance Measurements 57 LTCA 10 LTCA 40 USER S MANUAL LIST OF FIGURES Fiseure 1 0 Controls and 01600192 10 Figure 2 0 LTCA 40 Controls and Indicators 12 Figure 3 0 Typical Connections to Load Tap Changer 15 Figure 4 0 Typical LTCA 10 Connection Diagram Dynamic Resistance Test 15 Figure 5 0 Typical LTCA 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 1 5 2220000 18 Figure 8 0 Typical Triple Reading Test Report Printout eeeeeeeeseseeeeeeeeeeeneeeeeeeennnnnnnn 27 Figure 9 0 Typical Dual Reading Test Report
8. The following screen will be displayed if previous data for the same test type 1s 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 memory Press the 2 key to 24 LTCA 10 LTCA 40 USER S MANUAL 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 2 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 1 YES If you would like to run another test press 11 key YES and return to step 2 NO If you do not wish towun another test press the 2 key and continue to step o o The SAVE THIS RECORD menu will be displayed SAVE THIS RECORD 1 YES NO The test record must be saved to Flash EEPROM so that it can recalled and printed at a
9. 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 AN Press the 3 key SAVE RESTOPRF RECORD c The following menu wilh 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 ESTOP TS E 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 XX ERASED Press the ENTER key and you will be returned to the beginning of step d 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 mmy ama Press the STOP key to canc the process and return to the START UP menu
10. s alpha numeric keypad and then press the ENTER key 45 LTCA 10 LTCA 40 USER S MANUAL 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 9 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 RESTOPRF RECORD c The following menu willbe 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 1 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 ENTER key The RESTORING RECORD screen will be displayed momentarily RESTORING RECORD Continue to ste
11. 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 is 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 TRANSFOR RESIETANCE METER TM Van uard Instruments Co Inc Ontario California USA 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 l RAISE LOWER LTC CONTROL Functional Description Clamp on AC current probe connector USB Interface Port USB 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
12. 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 resu ts itis recommended that only VIC thermal paper be used Liquid Crystal Dispiay 64 x 128 dot graphic display Back lit and viewable in bright sunlighi ana low light conditions Displays menus user selections status reac outs and test results oad fap 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 stop bits 8 data bits and no parity bit Semel Grau Voltage sensing input channels 1 2 and 3 Female test connector jacks for connecting test current output test leads
13. 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 NO The following message will be displayed Press the 1 key DO NOT SAVE R CORD if you do not want to save the record You will be returned to the START UP menu Press the 2 SAY REC ORD to save the record Continue to step m m The Will be displayed Press the ENTER key to return to the START UP menu 33 LTCA 10 LTCA 40 USER S MANUAL 5 6 1 Special Resistance Test Result Printout RECORD NUMBER 7 TEST RESULT S Coe oS 1 SS 3 T I mE 1 25 OQO COMPANY Fur IOM CIRCUIT TRAFO 4 GI 1 PASTI FACA3EEEL Lass 6 I 43 2 E3C29 35 1 KVe RTOS MYA OPERATORE HAI RESISTANCE DODATA HEAS T CT m 25 REF TEMP Te 165 OF CORPER WINDINGS TK EXC Fa Emana Tonac es i m gt oe mm Gp ire oa onl I EL TEST T c HI TESTEO 2 Arr FEL ZAZ MILL I Crbrde F ES aaa LLI Wa ECI Al TEST Tm 21 AA TESTEO AT a
14. DISCONNECTED KKK KKK KKK KK KKK KKK KKK KK KK 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 ZU SER 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 V1 V2 and V3 test currents will be displayed as shown below O 53mV 08 01 Press the STOP key to end the diagnostic test and return to the START UP menu 1 3 43 LTCA 10 LTCA 40 USER S MANUAL 59 Setup Menu The setup menu 15 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 9 1 Entering the Transformer ID Transformer information can be entered using the steps outlined below Start from the START UP inenu 1 TEST 03 04 09 p 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 TIME SET FONT Press the 1 key ENTER XFMR ID c The COMPANY screen will be dis
15. 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 Vanguard Instruments 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 None LTC Control DISCHARGE HIGH VOLTAGE PRESENT None RS 232C V1 V2 V3 CURRENT l RAISE LOWER LTC CONTROL Functional Description Clamp on AC current probe connector USB Interface port The air int
16. R1 7 285 MILLI OHMS Ris 9 033 MILLI OHMS R2 52 MICRO OHMS R2s 64 5 37 MICRO CHMS R3s 46 MICRO OMNS T LG NO I DIC oe iS Soe T Ir LA SS 3 Figure 3 6 ypical Triple Reading Test Report Printout TEST RESULTS DODATE 3 COMA T ST 2 O mer Sm KY FT ore AT OF EGLU I b EENT RESI STANCE A HEAS Tere T m 5 OC OF REF Ts BS OC Laas OF COF FP EE LAII I NGS s T E C mes T kc 2 27 CT ae t Y BE 1 f or r gt C wi TEST X TEESTEELDO AMPS 1 260 MILLI OHMS Ris 8 939 MILLI OHMS Re MICRO OHMS Res 753 MICRO OHMS 21 11 MNO LIL McG DAT E ee Figure 9 0 Typical Dual Reading Test Report Printout 27 LTCA 10 LTCA 40 USER S MANUAL TEST RESULTS ee COMAN ST aT I OMN CI gt 5 AT OF EGUI ENT RESISTANCE DATA MEAS T OGC FP OF TEn Tue Bs oc Leas oF 5 WINO I nc THE eag mu T 4 TK CT sm To EB o3 tmp Foe Lr oem
17. TEMP screen will be displayed REFERENCE TEMP 85 185 0 9 tee 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 The LTCA 10 40 will calculate the equivalent resistance value at this new temperature NOTE h The following WARNING screen will be displayed KKKKKKKKKWARNING KKK xxx x DANGEROUS FLASH OVER WILL OCCUR IF CABLES ARE DISCONNECTED 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 1 One of the following menus will be displayed with the relevant test current value depending on how many channels selected in step V1 TEST ONLY 1 amp Ve TEST l AMP TEST l AMP TEST START RUN TEST OR STOP TO ABORT START TO RUN TEST OR STOP TO ABORT V1 Test Only V1 amp V2 Test Vl 2 8 TEST l AMP TEST START 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
18. 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 CHARGING screen will be displayed XFMR CHARGING PLEASE WAIT XFMR ENERGIZED x This is only an informational screen to remind the operator that a test 1s 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 aud observe the resistance value immediately See section 6 1 for instructiois on how to select this option NOTE k The LTCA 10 40 determines when the resistance reading is stable and shows the resistance value the LCD as follows the first line shows the remaining test REMAINING 10 00 1 0 AMPS 2 070 ENERGIZED x When the pre defined test time has elapsed the TEST RESULTS screen will be displayed TEST RESULTS 1 09 AMPS 7 285 _ The number of resistance values shown will depend on number of channels chosen in step c NOTE Press the ENTER key 1 The SAVE THIS RECORD menu will be displayed SAVE THIS RECORD 1 YES NO LTCA 10 LTCA 40 USER S MANUAL
19. 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 sese TEST geese 1 04 AMPS 7 272 mQ 358uQ XFMR ENERGIZED Once the data is saved the TEST SAVED message will be displayed TEST IN PROGRESS gt TEST SAVED lt 1 09 AMPS 1 7 272 2 35810 x XFMR ENERGIZED x I Press the STOP key to stop running the test Press the STOP key a second time to continue to the next step 23 LTCA 10 LTCA 40 USER S MANUAL 1 The PRINT TEST RESULTS menu will be displayed PRINT TEST RESULTS 1 YES NO 2 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 NO Press the 2 key NO to bypass the printing of test results Continue to step m m The KEEP THIS READING menu wil ve displayed KEEP THIS READING 1 YES NO l 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 is no previous data in the memory
20. on the screen can be made bold for better visibility This only affects 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 96 LTCA 10 LTCA 40 USER S MANUAL 6 0 LTCA 10 40 SPECIAL FEATURES 6 1 Bypassing the Resistance Value Display Delay When the 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 is displayed on the LCD This feature eliminates the possibility of early erroneous read
21. roe cam 14 4 3 Printer Paper Control M Nit bed Do 14 44 0 40 Printer 14 50 OPERATING PROGE 5 adis e 15 5 1 Typical Connections a Load Tap Changer 15 2 25 LICA 10 Cable 15 22 C Act Cable Connections Leno pe aU es 16 2 4 General PrOCedUleS 19 2 9 Bertornmine Resistance tob tee no Ea oia depre Laus 20 2 9 1 Resistance Test Result Printouts oe pee Ph a edad eius 21 Special Resistance eio be rtr e de ava bee cis 20 0 Special Resistance Test Result PEIDEOUEL SGre 34 2 06 10 2 7 a Dynamic ETC Mu one betae 35 LTC Test Result wipes 40 0 114 iei 42 SEE 44 Sk the 44 59 22 Lol 47 29 3 Prntine the Test Record oto uot 50
22. screen will be displayed D U T TEMP U F 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 h The REFERENCE TEMP screen will be displayed REFERENCE TEMP 45 0 C 165 0 tec 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 The LTCA 10 40 will calculate the equivalent resistance value at this new temperature NOTE i The following WARNING screen will be disviavec KKKKKKKKKWARNING KKKKKKKXX DANGEROUS FLASH OVER WILL OCCUR IF CABLES ARE DISCONNECTED KK KK KKK KKK KM KRY KKK KKKKKKX 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 One of the following menus will be displayed with the relevant test current value depending on how many channels were selected in step c V1 TEST ONLY 1 amp Ve TEST 1 AMP TEST 1 AMP TEST START TO RUN TEST START RUN TEST OR OR STOP TO ABORT STOP TO ABORT V1 Test Only V1 amp V2 Test 1 V8 8 TEST l AMP TEST START RUN TEST OR STOP TO ABORT V1 V2 amp V3 Test If you
23. will be displayed as shown below CONVERT READINGS TO STANDARD TEMP 1 YES NO 1 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 234 5 ALUMINUM Tk e25 0 3 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 230 0 adjust Tk ENTER to accept You can increase the Tk value by 0 5 C increments by pressing the PAPER Contrast key Yov can decrease the Tk value by 0 5 C increments by pressing the APARER v Contrast key Press the ENTER key to confirm your temperature selection Continue to step f 2 NO If you do wish to convert readings to standard temperature press the 2 key NO and eontinue to step h f After the Tk value has been selected the D U T TEMP screen will be displayed D U T TEMP 22 te 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
24. x 20 0 63 5 cm x 21 6 cm x 50 cm Weight 46 1 5 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 stat resistance reading channels One dynamic resistance channel 60 vac 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 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 4 4 2 3 7w3 x 4 4 2 10111 id CLIC Valld LTCA 10 LTCA 40 USER S MANUAL 3 0 CONTROLS AND INDICATORS 3 1 LTCA 10 Controls and Indicators The LTCA 10
25. 40 USER S MANUAL 5 7 1 Dynamic LTC Test Result Printouts RECORD NUMBER 47 SSF FELLILOT DATE lt gt 1 gt gt T X s Coco 140 35 TRAFO COMPANY STAT ION 2 MEF s PASTI mMmMOoObDEeEL L23456 7 3 vo Sm L234 3 gt lt L23456 Y lt gt KYA FTG Lo MYA HAr LTG TEST TESTED AT AMPS Z20009 H SAMPLE RAT E RESISTANCE PLOT MARKERS AT 1 6262 mt INTERVALS coo D lt gt i ES zz 4 5 4 00 D I 001 071 ET 0 91 81 0761 VANGUARD INSTRUMENT CO INC LTCA 10 REV 0 94 lt gt 2008 1520 5 HELLMAN AVE ONTARIO CA 91761 USA TEL 9092 923 9390 FAX lt 909 923 9391 WWW VANGUARD INSTRUMENTS SERIAL NUMBER 43001 Figure 12 0 Sample Normal Dynamic LTC Test Plot 40 LTCA 10 LTCA 40 USER S MANUAL RECORD NUMBER 7 DATE 3 2 lt TIME z oo 1 35 Pun APZB TRAFO 4 GI CPK COMPANY STATION TY MEF PASTI MODEL L23456 gt SM
26. 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 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 40 PRE TEST SETUP 41 Operating Voltages The LTCA 10 40 s operating voltages are 100 240 Vac and 50 60 Hz 4 2 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 qua ity and to avoid paper jams the use of thermal paper supplied by Vanguard Instruments Company 15 highly recommended Additional paper can 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 T
27. EVA OF ERAT OF HAT TEST TESTED AT io AMPS 10 610 MILLI OHMS T 2 1 3 1 MNG TESTEO O 215 21 10 612 MILLI OHMS vi ONLY TEST TESTED AT mA R1 10 613 MZLLDr OHMS T NO I 1 3 was Figure 14 0 Typical Test Record Printout 49 LTCA 10 LTCA 40 USER S MANUAL 5 9 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 RESTOPRF RECORD c The following menu willbe displayed 1 RESTORE RECORD SAVE RECORD 3 RECORD DIRECTORY 4 ERASE RECORD Press the 3 key RECORD DIRECTORY d The following menu will be displayed PRINTINT DIRECTORY 1 FULL DIRECTORY SHORT DIRECTORY 1 FULL DIRECTORY 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 typical directory printout is shown in figure 14 0 2 SHORT DIRECTORY Press the 2 key SHORT DIRECTORY to print a short d
28. P 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 51 Typical Connections to a Load Tap Changer LTC LOWER RAISE Figure 3 9 Typical Connections to a Load Tap Changer LTC 5 2 10 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 i Do not touch or disconnect any test lead that is connected to a transformer Figure 4 0 Typical LTCA 10 Connection Diagram Dynamic Resistance Test AN After discharge always disconnect test clips slowly from transformer bushings to prevent an accidental flash over WARNING 15 LTCA 10 LTCA 40 USER S MANUAL 5 3 40 Cable Connections Typical connection diagrams of the LTCA 40 are shown in Figure 4 0 5 0 and 6 0 Do not touch or disconnect any test lead that is connected to a tra
29. R DIAG Press the 1 key TEST XFMR to start a test b The following menu will be displayed 1 RESISTANCE TEST SPECIAL RESISTANCE TESY DYNAMIC LTC TEST Press the 3 key OY VAGMIC 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 1 5 AMPS 1 10 AMPS AMPS AMPS LTCA 10 LTCA 40 Select the test current by pressing the corresponding key on the LTCA 10 40 s keypad 11 or 2 35 LTCA 10 LTCA 40 USER S MANUAL The following WARNING screen will be displayed KK KKKKKKKWARNING KKK KKKKXKX DANGEROUS FLASH OVER WILL OCCUR IF CABLES ARE DISCONNECTED 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 The LTC TEST screen will be displayed with the relevant test current value selected in step d 10 AMP TEST START TO RUN TEST OR STOP TO ABOR
30. ST CURRENT menu will be displayed SELECT TEST CURRENT SELECT TEST CURRENT 1 1 AMP 1 1 AMP 5 AMPS 5 AMPS AMPS 10 AMPS 40 AMPS LTCA 10 LTCA 40 Select the test current by pressing the 1 2 or 4 1 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 1 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 234 5 ALUMINUM Tk e25 0 3 MANUALLY ENTER Tk a Press the 1 key to select copper as the winding material Continue to Step g b Press the 2 key to select aluminum as the winding material Continue to Step g c Press the 3 key to manually enter the Tk value The following screen will be displayed 230 tc TL to 056 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 g 2 NO If you do NOT wish to convert readings to standard temperature press the 2 key NO and continue to step i After the Tk value has been selected the D U T TEMP
31. T If you have made any errors would like to abort the test press the STOP key and you will be returned to tiie START UP menu 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 x 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 The LTCA 10 40 determines when the resistance reading is stable and displays the READY TO CAPTURE DATA screen READY CAPTURE DATA PRESS ENTER OR LTC RAISE LOUER NTART TIMING x XFMR ENERGIZED x Press the ENTER key to start capturing data for the time period selected 1n step e The LTC must be manually started to begin switching through the taps 36 LTCA 10 LTCA 40 USER S MANUAL 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 cycling from higher to lower taps will start capturing data The following screen will be displayed indicating that the test 1s in progress RUNNING DYNAMIC IS DES T 15 RL 7 369 mQ STOP KEY ABORT ENERGIZED x h When th
32. TER key The RESISTANCE PLOT RANGE menu will be displayed AWN PLOT RANGE 1 FULL RANGE LOmQ 100 LOmQ 2 100 1000 Select the resistance plot range by pressing the corresponding key on the LTCA 10 40 s keypad 1 2 3 4 5 or 161 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 is shown in figure 12 0 When printing 1s completed you will be returned to the PRINT AN EXPANSION PLOT menu and offered the option to print another expansion Return to step 1 2 NO Press the 2 key NO if you do not wish to print an expansion Continue to step The SAVE THIS RECORD menu will be displayed SAVE THIS RECORD 1 YES NO 38 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 k 2 NO If you do not wish to save the record press the 2 key NO The following message will be displayed Press the 1 key DO NOT SAVE R CORD if you do not want to save the record You will be returned to the START UP menu Press the 2 SAY REC ORD to save the record Continue to step k k The will be displayed Press the ENTER key to return to the START UP menu 39 LTCA 10 LTCA
33. USER S MANUAL for the LTCA 10 407 LOAD CHANGER ANALYZER 212 Vanguard Instruments Company Inc 1520 S Hellman Ave Ontario California 91761 TEL 909 923 9390 October 2011 FAX 909 923 9391 Rev 2 2 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 00507766 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 tr ined operators All transformers under test shall be off line and fully isolated DC 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 t
34. WAIT After the LTCA 10 40 finishes its internal calibration the CHARGING screen will be displayed XFMR CHARGING PLEASE WAIT x XFMR ENERGIZED x k LTCA 10 LTCA 40 USER S MANUAL 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 22 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 resistance values on the LCD screen as follows TEST IN PROGRESS 1 09 AMPS RL 7 070 mQ 5 XFMR ENERGIZED x The LTCA 10 40 will continue the test update the resistance values the LCD screen While the test 1s in progress the ENTER key can be pressed to save the current rN A reading on the LCD to the A 10 40 s internal working memory This feature is very convenient for storing multiple readings during 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 is stable press the ENTER key to save the reading Then the user can change the tap position and save the stable reading at the
35. ake 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 4 5 inch wide thermal NOTE For best printing results it is recommended that only VIC thermal paper be used Liquid Crystal Dissiay 64 x 128 dot graphic display Back lit and viewable bright 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 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
36. asure 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 in the transformer at the end of each test LTCA 10 40 has one resistance reading 9 dedicated for dynamic resistance testing The dynamic resistance test feature caa used to monitor the transformer LTC or Voltage Regulator contact resistance while changing tap positions A resistance plot shows the transformer LTC contact and windine resistance and can be used to detect L TC Voltage Regulator contact problems 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 t
37. e pre defined test time has elapsed or the STOP key is pressed the PRINT TEST RESULTS menu will be displayed PRINT TEST RESULTS 1 YES NO 1 YES Press the 11 YES to print the test results on the built in thermal printer The following menu will be displayed SELECT PLOT TYPE 1 NORMAL PLOT EXPANDED PLOT 1 NORMAL PLOT Press the 1 key NORMAL 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 1 2 EXPANDED PLOT To print an expanded plot press the 2 key EXPANDED PLOT Continue to step 1 2 NO Press the 2 key VO to bypass the printing of the test results Continue to step i The PRINT AN EXPANSION PLOT menu will be displayed PRINT AN EXPANSION PLOT 1 YES NO 37 LTCA 10 LTCA 40 USER S MANUAL 1 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 EXPANDED RES ONLY Press the corresponding key 1 or 2 to select the expansion type The EXPANSION PRINT menu will be displayed EXPANSION PRINT START TIME D 5 END TIME 5 mw 4 Enter the START time and press ENTER key Enter the END time and press the EN
38. hat repairs be performed only 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 DOCUMEN ote edu petente 5 INTRODUC TION 6 Wl General 6 L2 lt a eo 6 bs Pum POAC 5 7 2 0 TECHNICAL SPECIFICATIONS 8 242680 5 0 60222252 50402222020222 2600 0 0200022202 0062222600262626 8 21 JTCA IO Technical 00 digs 8 2 2 Technical 9 3 0 CONTROLS AND INDICATOR E Eee inte es 10 ox XGDCASDO Controls dnd i Mei 10 3 2 LTCA 40 Controls and 8 12 Z0 SE UP etta aoi veio esos 14 1 Operans VONAGE oo a 14 42 LTCA 10 40 LCD Contrast Control 4 NO ot bei n Ete
39. ings Depending on the transformer size the delay may be longer than 3 minutes The operator can bypass this delay and observe the test results immediately To bypass this delay press the 9 key the 8 key 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 is turned off When is turned on again it will use the default 3 minute minimum delay before displaying tesistance 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 at a different temperature The conversion 15 accomplished by the following formula Rs Rm Ts Tk Tm TK Where Rs 1s 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 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 2 e October 3 2011 Copyright 2011 by Vanguard Instruments Company Inc 08
40. irectory listing This lists the last 12 records store in the LTCA 10 40 s memory After the directory 1s printed the display will return to the START UP menu A typical directory printout 1s shown in figure 14 0 50 LTCA 10 LTCA 40 USER S MANUAL T ET ot ORT RECORDO 11 1 DAT T IT ME gt 71 gt lt x SPEC I AL TEST NU MEB OF TESTS STAT ON 22 TRAFO Sr PASTI MODEL 123456 7 BS SANE L23456 1 Z34756 RECORDO MUMS Fe Sa DAT Ere T I ME C bm 1 lt gt ONL x SPECI AL or TEST S STAT ION Aare T Ferca a GI Mier I MODEL TY lt O S Ni 7 gt lt 21 Z34566 r lt gt F C O R O gt DAT T I 1 gt d s ENT vs Sree ore TEST a STAT ION ees T TRAFO gt MEEF PAST I MODEL 6 lt gt SAN L23456 1 5 cG G EAS RECORDO NLUJMBEF DAT T I ME lt lt wi 2 vs TEST NU M E F oF TESTS 2 STAT I gt
41. later time NOTE 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 VO 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 25 LTCA 10 LTCA 40 USER S MANUAL message will be displayed p The followin R 1 Press the ENTER key to return to the START UP menu 26 LTCA 10 LTCA 40 USER S MANUAL 5 5 1 Resistance Test Result Printouts TEST RESUL T S oe T IME c La SEX uL COMPANY STAT ION EF gt CI TRAFO 4 Gor rir re 5 _ 91 67 B99 1 5 42567394 EVA eT OFFERAT Hear EUI VALENT RESISTANCE DATA MEAS 271 T m OC Fe OF REF T Ts OS OC Leos oF ALUMI Wino NaS TE ol Te 22 3 gt 1 Ub m gt or r Lr 4 gt Vwi VS 2 5 TEST AT PIE
42. nsformer AN 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 Figure 5 0 Typical LTCA 40 Connection Diagram Dynamic Resistance Test AN After discharge always disconnect test clips slowly from transformer bushings to prevent any accidental flash over WARNING 16 LTCA 10 LTCA 40 USER S MANUAL e 5 080727LTCA40V663E 8 5 a 5 J i i v m 2 Em 7 9 1 gt 2 T Figure 6 0 Typical LTCA 40 Connection Diagram 2 Windings 17 LTCA 10 LTCA 40 USER S MANUAL Dec uc c 1 51 FA f gt x A Et V1 VT A Figure 7 0 Typical LTCA 40 Connection Diagram 3 Windings 18 5 4 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 N Always connect the LTCA 10 40 to the substation ground before connecting test leads to any transformer bushing Failure to follow this procedure may WARNING 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 tra
43. nsformer terminals for the winding that is to be measured Turn on the LTCA 10 40 power by pressing I on the rocker switch Once the power is turned on the unit will perfora self calibration and display few start up messages Once the short start up sequerice 1s completed the START UP menu will be displayed date and time will obviously be different 1 TEST XFMR 02 3 SETUP 09 25 03 3 USER DIAG 19 LTCA 10 LTCA 40 USER S MANUAL 5 5 Performing a Resistance Test a Start from the START UP menu 1 TEST 03 04 04 SETUP 09 28 03 3 USER DIAG Press the 1 key TEST to start a test b The following menu will be displayed 1 RESISTANCE TEST SPECIAL RESISTANCE TEST 3 DYNAMIC TEST Press the 1 key RESISTANCE TEST to start a resistance test c Thefollowing menu will be displayed l Vh Vea RES TEST Ve RES Hee Sa 3 V1 ONLY RES Select the number of cnezinels that will be used to measure resistance by pressing the corresponding numeric key 111 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 10 AMPS 10 AMPS 4 40 AMPS LTCA 10 LTCA 40 Select the test current by pressing the 1 2 or 4 1 40 only key The CONVERT READINGS TO STANDARD TEMP menu
44. o control the unit The LTCA 10 40 features a back lit LCD screen 64 x 128 dot graphic that is viewable in 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 in 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 s law R V I where I is a known current and V is the DC voltage measured across the unknown resistance The value of the unknown resistance 15 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 t
45. o output 1 5 and 10 Amperes of test current The LTCA 40 can output 1 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 15 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 is also included LTCA 10 LTCA 40 USER S MANUAL 2 0 TECHNICAL SPECIFICATIONS 2 1 LTCA 10 Technical Specifications Table 1 0 LTCA 10 Specifications TYPE PHYSICAL SPECIFICATIONS OPERATING VOLTAGE RESISTANCE READING RANGE ACCURACY RESISTANCE 5 TEST VOLYAGE 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 Load tap changer analyzer 21 W x 9 H x 17 53 cm 24 cm x 43 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 niili onms 1 reading 1 count 1 50 ohms 1 5 reading 1 count Three static resi
46. p e 47 2 10 40 USER S MANUAL SCROLL 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 5 00 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 RESTORU RECORD screen will be displayed momentarily RESTORING RECORD Continue to step e a record has been restored the following screen will be displayed RECORD RESTORED PRINT RECORD 1 YES NO 1 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 is 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 RESULTS FACT e GE Les SS aS 12343586 B
47. played COMPANY T L TO POSITION ENTER TO ACCEPT Enter the utility company s name by using the LTCA 10 40 s alpha numeric keypad and then press the ENTER key d The STATION screen will be displayed STATION T L TO POSITION ENTER ACCEPT LTCA 10 LTCA 40 USER S MANUAL 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 POSITION ENTER TO ACCEPT AN Enter the transformer manufacturer by using the LTCA 10 40 s alpha numeric keypad and then press the ENTIER key The MODEL screen will be displayed MODEL T L 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 The RATING screen will be displayed KVA RATING T L POSITION ENTER TO ACCEPT Enter the transformer s KVA rating by using the LTCA 10 40
48. stance 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 61010A 1 and CAN CSA C22 2 No 1010 1 92 standards Operating 10 C to 50 C 15 F to 122 F Storage 30 C to 70 22 F to 4158 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 Table 2 0 LTCA 40 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 OPTIONS WARRANTY Load tap changer analyzer 25 W x 8 5 H
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