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EZCT-S2A User`s Manual - Vanguard Instruments Company, Inc.

1. u Press the 4 key SAVE RES RECORD The following screen will be displayed 1 RESTORE RECORD da LUPY TO Press the 1 key RESTORE RECORD d The following screen will be displayed 1 IHTERHAL STORAGE 2 THUMB DRIVE Press the 2 key THUMB DRIVE EI 040 u o EZCT S2A USER S MANUAL REV1 e The following screen will be displayed REZTORE THUME DRIVE REC Type the record number that you would like to restore and press the ENTER key If you do not know the record number you can print a test record directory Please see section 3 3 4 for details f The following screen will be displayed while the record is being restored THUME DRIVE REC Gel 1L WAIT Once the record has been restored the record s graph will be displayed as shown below 1000 100v SATION Press any key to continue g The following screen will be displayed RECORD 881 REZTORET RECORD NE If you do not want to print the test record press the 2 key NO The test record will be restored to the working memory and you will be returned to the START UP menu If you would like to print the test record press the 1 key YES Continue to step h _ REV1 2 52 USER S MANUAL h The following screen will be displayed Press the 1 key to print
2. 82 2 ub 87 Ee 88 quis 89 gui 90 91 E e T 92 93 gusce 93 REV1 2 52 USER S MANUAL CONVENTIONS USED IN THIS DOCUMENT This document uses the following conventions A key or switch on the EZCT S2A is indicated as KEY and SWITCH Menu options are referenced as MENU OPTION Screen and menu names are referenced as SCREEN MENU NAME The terms test record and test shot are used interchangeably EZCT S2A LCD screen output is shown as When instructions are provided the menu item that should be selected is shown in bold as shown below option 3 should be selected Warning messages are indicated as Important notes are indicated as e EZCT 52 USER S MANUAL REV1 1 0 INTRODUCTION 11 General Description and Features The EZCT S2A is Vanguard s third generation microprocessor based current transformer test set The EZCT S2A can perform the current transformer CT excitation CT current rat
3. REV1 2 52 USER S MANUAL k When pressing a key the corresponding number on the key will be displayed first Pressing the key again will display the first letter on the key Pressing the key again will display the second letter on the key For example to type the letter A you must press the 2 key twice To erase the character at the cursor position press the CLEAR key Press the PAPER Contrast button to move to the next character Press the PAPER v Contrast key to move to the previous character Press the ENTER key when you are done typing the note The following screen will be displayed Press the START key to begin running the test If the selected test included an excitation test the following screen will be displayed e If the selected test included a ratio test the following screen will be displayed EZCT S2A USER S MANUAL REV1 When the testing is finished the final results graph will be displayed Tana Ion Tu Lal An d Press any key on the keypad to continue The following screen will be displayed PRINT TEST RESULTS i YES Press the 1 key YES if you would like to print the test results The test results will be printed on the thermal printer A typical EZCT S2A tabulated test report printout is shown in Figure 5 A typical graphic report is shown in Figure 6 Press the 2 key NO if you do not want to print the test results m Th
4. SETUP 5 67 4 1 Setting the Knee Point Marker enne 67 4 2 Enabling and Disabling the Buried CT in Transformer Delta Option 70 4 2 1 Enabling the Buried CT in Transformer Delta 70 4 2 2 Disabling the Buried CT in Transformer Delta Option 71 ee Tei 75 4 4 Printing Memory Buffer 2 76 5 0 DIAGNOSTICS VERIFICATION AND TROUBLESHOOTING 78 Bee EZCT S2A USER S MANUAL REV1 o E Ge deele EC WR NEEN te EE 78 5 2 Verifying EZCT 52 5 V Sense Circuit Using an External Meter 80 5 3 Verifying the EZCT S2A s 1 Sense Circuit Using an External 81 5 4 Quickly Verifying the EZCT S2A s Turns Ratio 0 00 00 0 0 2 2 82 59 PROUD SOO LEE TE 83 60 UPGRADING FIRMWARE secescsivintsecdscsavansveatevannndutanndendexpeusaedeenvanceavaiceadGreatseuioreesaneeswancnteunens 84 7 0 Appendix A Calculating Turns Ratio a Shunt 87 LIST OF TABLES Table 1 EZCT S2 Technical Specifications CERS 4 Table 2 Functional Descriptions of EZCT S2A Controls and 6 Table 3 Descriptions of Tabulated Te
5. LL L 1 Bi 9 5 so 1 325 4 Sa vw TABULATED GRAPH POINT S CUR gt VYT CN a lt OHMSS gt gt OO 34 22 gt 2 lt gt 22 lt gt O OOO lt 200 lt CC5t 5c0 L O 200 O gt gt lt gt 1 O b lt 2 lt gt lt gt O gt lt lt O oOo 222 gt gt gt Z200 lt oOo O lt lt lt D 2 5 lt gt lt gt LO lt 2 70 6 lt OBO ao E O gt LOOO ct 1 E32 22 ZOOO O Soo D 4 lt ra Ss A Ee 4 S000 Cre gt L53 lt o 3 Load 17 L gt gt 5 5 es 5 ASA LO lt VK ES ASA 1o S gt 0 Ik pp er 2 oL Ts 4 8 o 2538 AMPS IEEE 30 gt vin 60 83 T IEEE 30 gt rk z0O0 AMPS sch lt gt VK p 49 O VOLTS IEEE 45S I Oo 15e4 AMPS NAME PLATE RATIO 1 MEASURED RATIO So lt i gt PERCENT ERROR OB POLARI TY IN PHASE PHASE ANGLE D C gt lt ION MT Cc gt lt 10 ION CUR 39 VOLTS o 1522 4 Anes lt 1 Figure 5 Typical EZCT 52 Tabulated Report Printout EZCT S2A USER S MANUAL 1 Table 3 Descriptions of
6. Press the 1 key to print a full directory listing of all the test records stored in the EZCT S2A s Flash EEPROM The directory listing will be printed on the thermal printer and you will be returned to the START UP menu A sample directory listing printout is shown in Figure 7 Press the 2 key to print a short directory listing of the stored test records The short directory option prints the last 10 records stored in the EZCT S2A s Flash EEPROM The short directory listing will be printed on the thermal printer and you will be returned to the START UP menu RECORDO PFILIFTES3E TF OAT 7 IJFT1E3E F OF STAT I OFN mie Fe F1OXDE L Srl Comments EZCT 52 USER S MANUAL REV 1 TEST DIRECT ORY CR sch lt lt TESTS LAB FE NUMB BEF OAT C amp T I ric F F STAT COP CL Ye Cut T FFF MOGEL SPI Comme 5S oF LECH oS 55 57 TEST 5 3r1e0a mc p Meg gt LT ear C T RECORDO NUMB BEF DAT E T I ME FJLJ rdT3ESE F OF STAT I OF T rier C UCrTF3EETFPrT S oF 21 25 Lec TEST SHA T SUBI SHI c coy b 1 or KS
7. Press the ENTER key d The following screen will be displayed f EHTER TEST 1 To POSITION ENTER ACCEPT Use the alpha numeric keys on the keypad to enter a test note and press the ENTER key The following confirmation screen will be displayed showing the test parameters TEST 1 PARAMETERS 158v 1 Hp START TO BEGIH Press the START key to begin the test The EZCT 52 will start performing the test per the test plan parameters When the test has finished the following screen will be displayed AMY KEY COHTIHLE Wee LI EN EN E Leg y Hei e Press any key to continue LIUM 0 EZCT S2A USER S MANUAL REV1 g The following screen will be displayed Press the 1 key YES if you would like to print the test results Press the 2 key NO if you do not want to print the test results h The following screen will be displayed Press the 1 key YES to keep the test results i Thefollowing screen will be displayed Press any key to continue j The following screen will be displayed Press the 1 key YES to save the record 200 0 E REV1 2 52 USER S MANUAL The following screen will be displayed momentarily The following confirmation screen will then be displayed Press any key to return to the START UP menu EZCT 52 USER S MANUAL REV1 3 4 10 Unloading a Test Plan from t
8. INTERNAL STORAGE 2 THUMB DRIVE Press the 1 key INTERNAL STORAGE The following screen will be displayed 20 EZCT 52 USER S MANUAL 1 Type the test plan number that you would like to load and press the ENTER key If you do not know the test plan number you can print a test plan directory using the instructions in section 3 4 2 d The following screen will be displayed Press any key to return to the START UP menu REV1 2 52 USER S MANUAL 3 4 8 Loading a Test Plan from a USB Flash Drive To load a test plan from a USB Flash drive Make sure the USB Flash drive is inserted in the S2A s USB Flash drive port USB MEM port Then start from the START UP menu TEST le 18 24 ie FUE leis Ze 22 TEST PLANS 4 DIAGHOSTIC Press the 3 key TEST PLANS The following screen will be displayed LOAD TEST PLAH 2 UNLOAD TEST PLAN PLAN DIRECTORY 4 EXTRACT TEST PLAN TEST PLA ERASE TEST PR oh CORY TO THUME DRIVE Press the 1 key LOAD TEST PLAN The following screen will be displayed 1 INTERHAL STORAGE 2 THUME DRIVE Press the 2 key THUMB DRIVE The following screen will be displayed LOAD TEST HUMBER Type the test plan number that you would like to load and press the ENTER key If you do not know the test plan number you can print a test plan directory using th
9. TEST COMPANY STAT I ON CIRCUIT mer e MODEL COMMENT TEST PLAN NUMBER OF COMPANY STATI ON CIRCUIT MFF MODEL s COMMENT e TEST PLAN NUMBER NUMBER OF TESTS e APPARATUS TEST ING AN STATION SHASTA SWI CHYARD CIRCUIT SHA ee MEFR MI T SUBI SHI ELLECTRI MODEL OAC CTS oHnHosonr COMMENT COMPANY TEST PLAN NUMBER TESTI NUMBER OF APPARATUS TESTING STAT ION gt mses CIRCUIT MAIN mer 0 MODEL COMMENTS COMF ANY TEST PLAN NUMBER OF COMPANY s t STAT ION tamt I T t em em t MEF r1O0ODE L Comment e TEST PLAM HUMBER OF CC Or FT AMN MODEL gt T e em t FJLIFTESE F TEST PLAN F ALAFAEEF OF TESTS P4 CL e FD CIRCUIT rir r r1ODE L gt Figure 8 Typical EZCT S2A Flash EEPROM Test Plan Directory Printout REV1 2 52 USER S MANUAL 3 4 3 Printing a Directory of Test Plans Stored in a USB Flash Drive To print a directory of all the test plans stored in a USB Flash drive a Make sure the USB Flash drive is inserted in the EZCT S2A s Flash drive port USB MEM port Then start from the START UP menu
10. 2 key BURIED CT DELTA OFF The following screen will be displayed Press any key to return to the START UP menu REV1 2 52 USER S MANUAL Vh 081121EZCT2kV667D Figure 12 Buried CT in a Delta Transformer Illustration 1 081121EZCT2kV667E Figure 13 Buried CT in a Delta Transformer Illustration 2 EZCT 52 USER S MANUAL 1 REV1 2 52 USER S MANUAL 4 3 Setting the Clock To set the EZCT 52 5 internal clock a Start from the START UP menu TEST 15 18 SETUP 10 24 25 TEST 4 DIAGHOSTIC Press the 2 key SETUP b The following screen will be displayed RECORD ID FRIHT RECORD RECORD RECORD ERASE RECORD HEAT Nit u Press the 6 key NEXT PAGE c The following screen will be displayed SET TIME BURTED CT DELTA POIHT MARKER EAH DATA A IN PG rt Press the 1 key SET TIME d The following screen will be displayed EHTEE Enter the month date time hours minutes and seconds in 24 hour format using the alpha numeric keypad When the last digit is entered the clock will be set and you will be returned to the START UP menu LIN 0 EZCT 52 USER S MANUAL REV1 4 4 Printing Raw Memory Buffer Data You can print the raw data from the EZCT S2A s memory buffer for diagnost
11. ERASE ALL RECORDS ARE YOU SURE TO ee If you would like to cancel the erasure process press the STOP key No records will be erased and you will be returned to the START UP menu Press the ENTER key to continue with the erasure process The following screen will be displayed while the records are being erased ERASING RECORDS PLEASE WAIT The following screen will be displayed after all of the test records have been erased RECORDS ERASED Press any key to return to the START UP menu EZCT S2A USER S MANUAL REV1 3 3 6 Erasing Test Records From a USB Flash Drive You can erase individual or all test records stored in a USB Flash drive To erase a test record Make sure the USB Flash drive is inserted in EZCT S2A s USB Flash drive port USB MEM port Then start from the START UP menu FUH TEST SETUP 10 24 25 TEST PLANS 4 DIAGHOSTIC Press the 2 key SETUP The following screen will be displayed RECORD ID RECORD RECORD DIRECTOR SAVE RES RECORD ERASE RECORD HEST FAGE E bei Pg u Press the 5 key ERASE RECORD The following screen will be displayed 1 ERASE IHTERHAL REC 2 ERASE THUMB DEY REC Press the 2 key ERASE THUMB DRV REC REV1 52 USER S MANUAL d The following screen will be displayed 1 ERASE SINGLE REC Press the 1 key ERASE S
12. FRIHT RECORD RECORD SAVE RES RECORD ERASE RECORD HEAT Nit a Press the 6 key NEXT PAGE c The following screen will be displayed EIE BURIED CT DELTA ENEE MAREEE 4 DATA Press the 2 key BURIED CT IN DELTA d The following screen will be displayed 1 BURIED CT DELTA ON 2 BURIED CT DELTA OFF Press the 1 key BURIED CT DELTA ON REV1 2 52 USER S MANUAL e 4 2 2 The following screen will be displayed RATIOS WILL ADJUSTED BY 255 OL SURE 1 YES Press the 1 key YES The following screen will be displayed BUEIED CT DELTA RATIOS ADTUSTED Br THO THIFDS Press any key to return to the START UP menu Disabling the Buried CT in Transformer Delta Option To disable the Buried CT in Transformer Delta Option d b Start from the START UP menu RUN TEST SETUP TEST FLAWS 4 DIAGHOSTIC Press the 2 key SETUP The following screen will be displayed RECORD ID FRIHT RECORD RECORD DIRECTORY SAVE RES RECORD ERASE RECORD HEAT n 4 5 Press the 6 key NEXT PAGE LM EZCT S2A USER S MANUAL 1 C The following screen will be displayed Press the 2 key BURIED CT IN DELTA The following screen will be displayed Press the
13. Flash EEPROM You can restore a test record from the EZCT S2A s Flash EEPROM to the working memory You can then print the restored test record on the unit s built in thermal printer To restore a test record a Start from the START UP menu RUN TEST AS 16 16 SETUP 1B 24 22 5 TEST FLAHS 4 DIAGHOSTIC Press the 2 key SETUP b The following screen will be displayed a FEC URD ID da PRIHT ds ed ESL 5 RECORD DIRECTORY SAVYE RES RECORD a ERASE RECORD HEST Press the 4 key SAVE RES RECORD The following screen will be displayed RESTORE RECORD 1 EHTER RECORD HUMBER If you have a USB Flash drive inserted in the EZCT S2A s USB MEM port the following screen will be displayed instead of the above screen NOTE 1 RESTORE RECORD 2 TO DRIVE Press the 1 key RESTORE RECORD The following screen will be displayed REV1 2 52 USER S MANUAL 1 INTERNAL STORAGE 2 DRIVE Press the 1 key INTERNAL STORAGE The following screen will then be displayed REZTOURE RECORI i EHTER RECORD HUMBER z SCROLL TO SELECT Continue with the steps below 1 ENTER RECORD NUMBER If you know the record number that you would like to restore press the 1 key The following screen will be displayed RESTORE RECORI Type the record number using the alpha numeric keypad and
14. Header Information 11 3 2 2 Performing Excitation and Ratio Tests 14 3 3 Working With Test Records 24 3 3 1 Restoring and Printing a Test Record From Flash EEPROM 24 3 3 2 Restoring and Printing a Test Record From a USB Flash Drive 29 3 3 3 Printing a Restored Test Record 32 3 3 4 Printing a Directory of Test Records Stored in the EZCT S2A s Memory 34 3 3 5 Erasing Test Records From the Flash 37 3 3 6 Erasing Test Records From a USB Flash 40 SA WORKIN With Test TE 43 3 4 1 Extracting Test Plan From a Test Record 43 3 4 2 Printing a Directory of Test Plans Stored in the EZCT S2A s Memory 45 3 4 3 Printing a Directory of Test Plans Stored in a USB Flash Drive 47 S Printing a ee 49 3 4 5 Erasing Test Plans From the Flash EEPROM nnne 51 3 4 6 Erasing Test Plans From a USB Flash Drive 54 3 4 7 Loading a Test Plan from EZCT S2A s Flash 57 3 4 8 Loading a Test Plan from a USB Flash Drive 59 3 4 9 Running a Test Using a Loaded Test Plan 61 3 4 10 Unloading a Test Plan from the Working Memory een 66 4 0
15. OFF PUSH Functional Description Current transformer excitation voltage connector The EZCT S2A s X output terminal is rated to 1500 Vac working voltage Any voltage above 1500 Vac will damage the input circuitry Current transformer primary input test cable connector Built in 4 5 inch wide thermal printer Power switch with built in circuit breaker Power receptacle Ground terminal Back lit LCD Screen 240 x 128 dot graphic 114mm x 64mm RS 232C PC interface Baud rate is set for 115KB 8 data bits 2 stop bits USB PC interface Rugged alpha numeric keypad USB Flash drive interface port Test voltage presence indicator Emergency turn off switch REV1 2 52 USER S MANUAL 2 0 PRE TEST SETUP 2 1 Operating Voltages The EZCT S2A s operating voltage is preset at the factory for 100 120 Vac 50 60 Hz or 200 240 Vac 50 60 Hz 2 2 LCD Screen Contrast Control To increase the LCD screen contrast press and hold the PAPER Contrast key for two seconds Release the button when the desired contrast level has been reached To decrease the LCD screen contrast press and hold the PAPER v Contrast key for two seconds Release the button when the desired contrast level has been reached 2 3 Printer Paper Control To advance the thermal printer paper press and release the PAPER Contrast key To retract the thermal printer paper press and release the PAPER v Contrast key 2 4 Printer Paper The EZ
16. Plan To print a test plan Start from the START UP menu TEST le 18 EENS 18 24 25 TEST Pohs 4 DIAGHOSTIC Press the 3 key TEST PLANS b The following screen will be displayed LOAD TEST LUH Oo TEST HL OH DIRECTOR ES TRACT TEST PRINT TEST PLANH ERASE TEST TO THUME DRIVE i fF O ZS Lei Big Press the 5 key PRINT TEST PLAN The following screen will be displayed FEINT TEST PL oh HUMBER Type the test plan number that you would like to print and press the ENTER key If you do not know the test plan number you can first print the test plan directory using the instructions in section 3 4 2 The test plan will be printed on the thermal printer and you will be returned to the START UP menu A typical test plan printout is shown in Figure 10 Test plan elements are described in Table 4 EZCT S2A USER S MANUAL 1 T EET Y Fleer lt 4 NUMBER OF TESTS KNEE OOrmtEg APPARATUS TEST ING STAT I ON cCcA CUF Maso 5 CC I FSCCULOIT T MAITIN CT T MER F1OLDE L COMMENT 5 NUMBEF 3 TEST TYPE gt lt RAT gt lt gt lt 5 TESTED Ter TEST YTG RANGE Soo TEST CUR RANGE O A PLATE RATIO Loo 25 TST NOT TEST NUMBEF y ES a ESC
17. TEST le 1a 24 ie FUE leis Ze 22 TEST PLANS 4 DIAGHOSTIC Press the 3 key TEST PLANS b The following screen will be displayed LOAD TEST UNLOAD TEST PLAH DIRECTORY TEST PLAN TEST RL oh ERASE TEST TO THUME DRIVE LH F3 o with CH 1 Press the 3 key PLAN DIRECTORY The following screen will be displayed 1 IHTERHAL DIRECTORY 2 DRIVE DIR Press the 2 key THUMB DRIVE DIR d The following screen will be displayed while the test plan directory is being printed DIRECTOR You will be returned to the START UP menu once printing is finished A typical USB Flash drive test plan directory printout is shown in Figure 9 EINEN EZCT S2A USER S MANUAL REV1 Sun eae T EST LA COME eT ua ST AT I Of SZA TEST 5S FJUJFTESE F OF sA ANG UA F D L AB COME e ST eat roe CIRCUIT MODEL EZCT COMAE 1r1E3E F oF TEST GU A F E Lee CONME ec M ST aT uel CIRCUIT MODEL EZCT Figure 9 Typical USB Flash Drive Test Plan Directory Printout REV1 2 52 USER S MANUAL 3 4 4 Printing a Test
18. either the 1 key EEE 30 DEGREE the 2 key IEEE 45 DEGREE or the 3 key 10 V gt 50 I to select the desired knee point marker The knee point marker will be set and you will be returned to the START UP menu A graphic report showing the knee point marker is shown in Figure 11 REV1 2 52 USER S MANUAL n SE E a 8 Knee Point Marker Point Marker Iu EE w LL _ MENS aa TH E Seen GENRE GENE MARE ER DR ER E E bm bg ER Im H _ ES i E men 4 1 emp BENI L LLLLLE WS Point Marker 101 CT EXCITATION PLOT Tec 10975090 KNEE MARKER BESSE SS MLA LA 1 108 06 Figure 11 Graphic Report Showing Knee Point Marker EZCT S2A USER S MANUAL REV1 4 2 Enabling and Disabling the Buried CT in Transformer Delta Option 4 2 1 Enabling the Buried CT in Transformer Delta Option If you are measuring the turns ratio of a CT buried in the transformer Delta windings see Figure 12 and Figure 13 for further information you must first enable the Buried CT in Delta option from the SETUP menu using the steps below a Start from the START UP menu SETUP 10 24 25 TEST PLANS 4 DIAGHOSTIC Press the 2 key SETUP b The following screen will be displayed RECORD ID
19. the full tabulated data and graphics results on the thermal printer After printing is finished you will be returned to the START UP menu Press the 2 key to print the test report and graphic results on the thermal printer without the excitation voltage and current data points After printing has finished you will be returned to the START UP menu EZCT S2A USER S MANUAL REV1 3 3 3 Printing a Restored Test Record You can print a test record at the time that it is restored from the Flash EEPROM see section 3 3 1 or you can restore it to the working memory and print it later To print the current test record in the working memory Start from the START UP menu ia EUH TEST Aa 14 18 2 SETUP 59 59 4 TEST PLANS 4 DIAGHOSTIC Press the 2 key SETUP The following screen will be displayed Eel See I PRINT RECORD a RECORD DIRECTORY 4 SAVE EES RECORD ERASE RECORD 2 HEST Press the 2 key PRINT RECORD The following screen will be displayed PRINT OFTIONS FULL DATA DATA If there is no test record in the working memory the following screen will be displayed NOTE SHOTS TO Press any key to return to the START UP menu Please see section 3 3 1 for instructions on how to restore a test record REV1 2 52 USER S MANUAL Press the 1 key to print the tabulated data a
20. 2A Press any key to return to the START UP menu REV1 2 52 USER S MANUAL 3 4 2 Printing a Directory of Test Plans Stored in the EZCT S2A s Memory You can print a directory of all the test plans stored in the EZCT S2A s Flash EEPROM using the steps below a Start from the START UP menu ia EUH TEST 16 18 EE 18 24 25 5 TEST Pohs 4 DIAGHOSTIC Press the 3 key TEST PLANS b The following screen will be displayed LOAD TEST PLAN 2 UNLOAD TEST PLAN PLAH DIRECTORY 4 EXTRACT TEST PLAN Ja PRIHT TEST FLAH Sa ERASE TEST FLAH EL UU Press the 3 key PLAN DIRECTORY The following screen will be displayed while the test plan directory is printed on the thermal printer DIRECTORY The above screen will be displayed only if a USB Flash drive is NOT connected to the EZCT 52 5 USB Flash drive port If a USB Flash drive is connected the following screen will be displayed NOTE 5 pay 1 INTERNAL DIRECTORY SNE dise Press the 1 key INTERNAL DIRECTORY Continue with the steps below 0 EZCT S2A USER S MANUAL 1 You will be automatically returned to the START UP menu after the directory printing is finished A typical Flash EEPROM test plan directory printout is shown in Figure 8 below TEST PL_ARmN DI Fe TEST PLAN gt A NUMBER OF
21. 514 X2 EZCT 524 CURRENT TRANSFORMER TESTER gt Vanguard Instruments Co Inc Ontario California USA Figure 16 EZCT 52 Verification Test Connections EZCT 52 USER S MANUAL 1 5 4 Quickly Verifying EZCT S2A s Turns Ratio Circuit You can quickly verify the EZCT S2A s turns ratio circuit by performing the following ratio test a Connect the X1 test lead to the H1 test lead as shown in Figure 17 b Connect the X2 test lead to the H2 test lead as shown in Figure 17 c Runaturns ratio test see section 3 2 2 d Observe the turns ratio test on the LCD screen The turns ratio should be 1 000 since the excitation voltage is the same as the sensed voltage EZCT s2A CURRENT TRANSFORMER TESTER 1 5 Paran A JKL CONTRAST 7 8 CONTRAST pars ruv 0 25 UW Vanguard Instruments Co Inc TURN OFF Ontario California USA PUSH Figure 17 EZCT S2A Turns Ratio Verification Test Connections REV1 2 52 USER S MANUAL 5 5 Troubleshooting Guide PROBLEM DESCRIPTION When running the excitation test the V voltage is always zero The excitation current can be raised during a test When running the excitation test the V voltage can be raised but the excitation current is always zero during a test Cannot reach the CT knee point voltage the current did not reach at least 1A When running the excitation t
22. 52 USER S MANUAL 1 When the firmware upgrade has finished the following screen will be displayed You will hear a series of beeps as the unit re boots Once the unit has re booted the START UP menu will be displayed REV1 2 52 USER S MANUAL 7 0 Appendix A Calculating Turns Ratio on a Shunt Reactor The Vanguard EZCT line of products use the voltage method to measure the turns ratio on current transformers A typical connection for a stand alone CT is shown in Figure 18 H1 H2 Figure 18 The EZCT applies a test voltage V1 to the CT secondary winding The induced voltage V2 is sensed through the CT primary winding In this case a single conductor is used By definition the turns ratio is the voltage ratio V1 Ratio V2 EZCT 52 USER S MANUAL 1 Figure 19 shows a typical connection of a CT mounted on the primary bushing of a single phase transformer When the voltage V1 is introduced to the CT s secondary winding there is an induced voltage V3 on the primary winding of this single phase transformer Since the only access to the transformer is between terminals H1 HO The V3 voltage will be included and the turns ratio will be V1 V2 V3 Ratio H1 V2 X1 V3 H2 X2 Figure 19 Ideally we would like to eliminate the V3 voltage and only see the V2 voltage If the induced V3 voltage on the transformer winding cannot be eliminated the turns ratio meas
23. CONTINUE REV1 52 USER S MANUAL Press the ENTER key to continue e Ifthe selected test included an excitation test the following screen will be displayed Select the test voltage range by pressing the corresponding key 1 4 f Ifthe selected test included an excitation test the following screen will be displayed Select the maximum test current for the excitation test by pressing the corresponding key 1 161 g If the selected test included a ratio test the following screen will be displayed 1 YES Press the 1 key if you would like to enter the CT nameplate values The following screen will be displayed C EZCT 52 USER S MANUAL REV1 ENTER PLATE RATIO Type the first number using the keypad You can press the CLEAR key to restart a field entry if necessary Press the ENTER key The following screen will be displayed EHTER PLATE RATIO Hw Type the second number using the keypad The screen will be updated as shown EHTER PLATE RATIO 1 8 Press the ENTER key Continue to step h 2 NO Press the 2 key if you do not want to enter the CT nameplate values Continue to step h h The following screen will be displayed TEST 1 TL POSITION ENTER TO ACCEPT Use the alpha numeric keys on the keypad to enter a test note The test note field is 20 characters long One test note can be saved for each test
24. CT 52 5 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 Vanguard Instruments Company is highly recommended Additional paper can be ordered from the following sources Vanguard Instruments Co Inc 1520 S Hellman Avenue Ontario CA 91761 Tel 909 923 9390 Fax 909 923 9391 Part Number VIC TP 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 EZCT S2A USER S MANUAL REV1 2 5 Replacing the Thermal Printer Paper The roll of thermal paper is housed inside a dispenser underneath the printer cover To replace the paper follow the steps below Unscrew the two large printer cover screws and remove the printer cover Remove the leftover thermal paper roll from the paper holder Unroll the new thermal paper roll Feed the thermal paper into the slot between the paper pocket and the rubber roller The printer will automatically pull the paper under the thermal head Place the paper roll into the paper holder Lift the thermal head and align the thermal paper if necessary Re install the printer cover 2 6 Computer Interface Ports The EZCT S2A features one USB and one RS 232C PC interface port A Windows based Current Transformer Analysis software application is supplied with the EZCT 52 For fu
25. Company web site at http www vanguard instruments com Use the steps below to download and install the latest EZCT S2A firmware a Visit the Vanguard web site at http www vanguard instruments com and click on the Downloads button Company Products Contact Data Sheets Software Versions Downloads Product Demos Support b You will be taken to the Downloads page and presented with a Download Request Form REQUEST SOFTWARE MANUAL DOWNLOADS Please select the check boxes for the items you would like to download For each selected item please be sure to provide your products serial number Once we receive your download request you will receive an email with links for the requested files Fields in RED are required fields Thank you Name E Mail Company Phone Comments 19140 Enter the security code shown above in the field below Circuit Breaker Timers Product PC Firmware Software User s Spanish Product Serial Number Software Manual Manual Manual Demo CBPS 300 3500 L 6500 a F A d a KH Fill out all required fields marked with red labels and then click on the Firmware checkbox to the right of the EZCT S2A label Then fill out the serial number field on the right Click on the Submit button once all form fields have been filled out REV1 2 52 USER S MANUAL C j The following confirmation page will be displayed RE
26. EHTER ACCEPT Enter any relevant comments using the alpha numeric keypad and then press the ENTER key The following screen will be displayed TA TL POSITION EHTER TO ACCEPT Type the operator s name using the alpha numeric keypad and then press the ENTER key All header information will be saved and you will be returned to the START UP menu EZCT S2A USER S MANUAL REV1 3 2 2 Performing Excitation and Ratio Tests The following procedure describes the general steps for performing excitation and ratio tests a When the EZCT S2A is turned on it will first go through a start up cycle and load the firmware Then the START UP menu will be displayed as shown below TEST 0214 10 SE TUF 18 24 25 TEST PLANS DIAGHOSTIC wk LE PJ rt Press the 1 key RUN TEST to start a test b The following screen will be displayed EXCITATION RATIO 2 EXCITATION ONLY RATIO OHLY Select the test type by pressing the corresponding key 1 3 The following screen will be displayed SELECT 51 2 MI H 1 5 Mi H d COD ZS Si i HEAT Select the tap connection by pressing the corresponding key 1 4 If the tap connection is not listed press the 5 key to view the next page of options d The following screen will be displayed HODE CABLES TO CT 4l CABLE TO CT a oc CABLE TO CT x2 EHTER TO
27. I T TESTED TAF z Ce E Dm wt Soo TEST YTG RANGE Cure RANGE 2 O A NeME PLATE RATIO aw 5 TST NOT E 65 RAT Figure 10 Typical Test Plan Printout Table 4 Description of Test Plan Elements m Description Number 1 Number of tests in test plan 2 2 Tests to be performed Excitation and Turns Ratio 3 Terminals used for excitation test X2 X3 4 Maximum excitation voltage 300 V 5 Maximum excitation current 2 0 A 6 CT nameplate ratio 100 5 7 Test notes if any REV1 52 USER S MANUAL 3 4 5 Erasing Test Plans From the Flash EEPROM To erase one or all test plans from the EZCT S2A s Flash EEPROM a Start from the START UP menu RUH TEST 2 SETUP TEST Pohs 4 DIAGHOSTIC Press the 3 key TEST PLANS b The following screen will be displayed LOAD TEST UNLOAD TEST PLAN FLAW DIRECTORY 4 EXTRACT TEST PLAN TEST RL oh ERASE TEST PLAH CORY TO THUME DRIVE iei P pee a I Un CF Press the 6 key ERASE TEST PLAN The following screen will be displayed TEST PL oh 1 ERASE SINGLE PR oh 2 ERASE ALL FLAHS The above screen will be displayed only if a USB Flash drive is NOT connected to the EZCT 52 5 USB Flash drive port If a USB Flash drive is connected the following screen will be displayed NOTE 5 1 ERASE INTERNAL PLAN 2 ERASE THMB DRY PLAN Pr
28. INGLE REC if you would like to erase a single record The following screen will be displayed Type the record number to be erased and press the ENTER key The following screen will be displayed Press any key to continue The following screen will be displayed EZCT S2A USER S MANUAL REV1 You can continue to erase additional records or press the STOP key to exit to the START UP menu ERASE ALL RECORDS Press the 2 key ERASE ALL RECORDS if you would like to erase all of the test records stored in the USB Flash drive The following confirmation screen will be displayed ERASE ALL DRIVE RECORDS YOU SURE ENTER TO COMTIHUE If you would like to cancel the erasure process press the STOP key No records will be erased and you will be returned to the START UP menu Press the ENTER key to continue with the erasure process The following screen will be displayed while the records are being erased ERASING ALL THUMB DRIVE RECORDS PLEASE WAIT The following screen will be displayed after all of the test records have been erased ALL DRIVE RECORDS ERASED Press any key to return to the START UP menu REV1 2 52 USER S MANUAL 3 4 Working With Test Plans A test plan is comprised of the saturation test voltage current range selection CT nameplate ratios and CT winding terminal combinations X1 to X5 for each test Up t
29. MAXIMUM AMBIENT TEMPERATURE 40 45 AMBIENT TEMPERATURE OlL MASS 38821 2715071 TOP Gil ASE WINDING AVERAGE RISE RATED POWER _ CEA OIL VOLUME gai 23836 1 TANK AND FITTINGS MASS 41006 ip 718600 SHUNT REACTOR TERMINALS UME HI NEUTRAL H RATED VOLTAGE v RATED CURRENT 380 se O SHIPPING WITHOUT Oi masa 1807511 45700 kg COMPLETE REACTOR MASS 160695 Jib 72890 Jkg RATIO TERMINAL 5000 5 AER HESPER CONSERVATOR AND RADIATORS WITHSTAND FULL VACUUM WARRANTY PERIOD 60 MONTHS AFTER ENERGIZATION OR 66 MONTHS AFTER DELIVERY 2 ALSTOM Grid Energia Lido AV GUILHERME SCHELL 11500 CANOAS RS CNR 05 356 94970009 08 MADE IN BRAZIL Figure 24 1 mA gt peste 2 C Vanguard Instruments Company Inc 1520 S Hellman Ave e Ontario CA 91761 USA Phone 909 923 9390 e Fax 909 923 9391 www vanguard instruments com Copyright 2010 by Vanguard Instruments Company Inc EZCT 52 User s Manual Revision 1 2 March 25 2014 TA
30. NUAL REV1 3 4 6 Erasing Test Plans From a USB Flash Drive To erase one or all test plans stored on a USB Flash drive Make sure the USB Flash drive is inserted in EZCT S2A s USB Flash drive port USB MEM port Then start from the START UP menu TEST le In 24 ie 18 24 25 TEST Pohs 4 DIAGHOSTIC Press the 3 key TEST PLANS The following screen will be displayed LOAD TEST UNLOAD TEST PLAN PLAH DIRECTORY TEST PLAN TEST ERASE TEST PLAH TO THUME DRIVE M OF F Le Fi e u Press the 6 key ERASE TEST PLAN The following screen will be displayed 1 ERASE FLA 2 ERASE THMB PLAN Press the 2 key ERASE THMB DRV PLAN The following screen will be displayed TEST PL oh 1 ERASE SINGLE PR oh 2 ERASE ALL FLAHS REV1 52 USER S MANUAL 1 ERASE SINGLE PLAN Press the 1 key ERASE SINGLE PLAN if you would like to erase a single plan from the USB Flash drive The following screen will be displayed Type the test plan number that you would like to erase and press the ENTER key The selected test plan will be erased and the following screen will be displayed Press any key to return to the START UP menu ERASE ALL PLANS Press the 2 key ERASE ALL PLANS if you would like to erase all the test plans on the USB Flash drive
31. OAT E T I ME MIU rA1EA3E F ore STAT I On EFU CCLUJICE T MPF n C UCrFAFAEEFT S C CL eeh Ca TEST ap e em E db RECORDO PFJLIFESE F Oe T ET I ME Suna OF STAT I OMN CI eCUIT mer FA1OCDE L S J 0 TEST 5 sch e e em en E RECORDO NUMB BEF DeTE T I ME r1E3E F coor STAT I Cord rif Fe F1ODE L C UCOFIFEEPFT 2 LECH E LO 3v TESTS asa raz CT T z Go6J RECORDO FPIJLUIFTES3E F 2 heat T I ME ST AT I OF T marr r1ODE L SP C COrir1E r4T e 162 TEST Figure 7 Typical Internal Test Record Directory Printout REV1 2 52 USER S MANUAL 3 3 5 Erasing Test Records From the Flash EEPROM You can erase individual or all test records stored in the EZCT S2A s Flash EEPROM To erase a test record a Start from the START UP menu FUH TEST 16 18 SETUP 1B 24 272 TEST FLAHS i DIAGHOSTIC Press the 2 key SETUP b The following screen will be displayed ID RECORD a RECORD DIRECTORY 4 SAVE EES RECORD ERASE RECORD HEST Press the 5 key ERASE RECORD c The following screen will be displayed ERASE 1 E
32. OMPTS 2 RUM AUTOMOMOUSL Y UNLOAD 1 RUN WITH PROMPTS Press the 1 key to run the test with prompts Continue to step c 2 RUN AUTONOMOUSLY Press the 2 key to run the test autonomously The following screen will be displayed CABLES WILL EMERGIZED START TO BEDGIH Press the START key The following screen will be displayed EZCT S2A USER S MANUAL REV1 HOOE CABLES TO CT 4l CABLE TO CT a oc CABLE TO CT x2 ENTER TO CONTINUE Press the ENTER key and the EZCT S2A will start running the test per the test plan settings The screen will be updated with the test status When the test has finished the following screen will be displayed AVE THIS RECORD 1 TES a Press the 1 key YES to save the record The following screen will be displayed momentarily SAYING RECORD PLEASE WAIT Then the following confirmation screen will be displayed RECORD HUMBER 2 HAS BEEH SAVED Press any key to return to the START UP menu 3 UNLOAD TEST PLAN Press the 3 key to unload the test plan and run a test without a test plan This will unload the test plan from the working memory and bring up the standard RUN TEST menu Please see section 3 2 2 step b REV1 2 52 USER S MANUAL C The following screen will be displayed HOOE CABLES TO CT 4l CABLE TO 41 md eee TA El Eege e ENTER TO COMTIMUE
33. QUEST SOFTWARE MANUAL DOWNLOADS We have received your download request and an email will be sent to you with the download links within the next 24 hours Thank you You will also receive an email confirming the receipt of your download request Once your request has been received you will receive a second email usually within 1 2 business hours containing a download link for the firmware file Click on this link and download the firmware file to your computer The downloaded file will be in ZIP compressed format Unzip this file to an empty directory you can use a utility like Winzip 7Zip Winrar etc Once un compressed you should see a file named EZCTS2AM hex Copy this file to the root of a USB Flash drive Make sure the EZCT S2A s power if OFF and then insert the USB Flash drive containing the firmware file in the EZCT S2A s Flash drive interface port USB MEM port While holding down the STOP key turn on EZCT 52 Continue to hold down the STOP key while the EZCT S2A powers up After the initial logo screen the following screen will be displayed START HANDSHARE DE INSERT DRY Continue to hold down the STOP key The firmware upgrade process will start and the following screen will be displayed ERASING EXT 4 LOADTHG CODE FROM FLASH DRY You can release the STOP key at this point The EZCT S2A will continue the upgrade process and display the following screen Kee EZCT
34. RASE SINGLE REC 2 ERASE ALL RECORDS The above screen will be displayed only if a USB Flash drive is NOT connected to EZCT S2A s USB Flash drive port If a USB Flash drive is connected the following screen will be displayed NOTE 5 1 ERASE INTERNAL REC 2 ERASE THUME DRY Press the 1 key ERASE INTERNAL REC The following screen will be displayed DENN EZCT 52 USER S MANUAL REV1 ERASE RECORD EFASE SIHGLE REC 2 ERASE ALL RECORDS Continue with the steps below 1 ERASE SINGLE REC Press the 1 key ERASE SINGLE REC if you would like to erase a single record The following screen will be displayed ERASE RECORD the record number to erased and press the ENTER key e Youcan press the STOP key to cancel the process e f you do not know the record number you can first print a test NOTES record directory using the instructions in section 3 3 4 The following screen will be displayed momentarily ERASING RECORD HUMBER 1 WAIT Then the following confirmation screen will be displayed RECORD HUMBER 1 ERASED Press any key to return to the START UP menu REV1 2 52 USER S MANUAL 2 ERASE ALL RECORDS Press the 2 key if you would like to erase all of the test records stored in the EZCT S2A s flash EEPROM The following confirmation screen will be displayed
35. Tabulated Test Results Elements Item Number Oo P CQ NM 10 11 12 13 14 15 16 17 Description Test record header information The X terminals taps that were selected for this test Test note for this particular test The test note can be up to 20 characters long Recorded excitation current readings on the CT secondary winding Recorded excitation test voltages applied to the CT secondary winding Impedance calculated at each data point The voltage current and impedance data points recorded on the graph grid marks ASA 10 50 knee point voltage and excitation current This is equivalent to the IEC 10 50 and ANSI 10 50 knee point voltage and excitation current IEEE 30 knee point voltage and excitation current IEEE 45 knee point voltage and excitation current CT nameplate turns ratio Measured turns ratio Turns ratio percentage error Polarity of the CT Measured phase angle Excitation voltage used in CT turns ratio test Excitation current in turns ratio test REV1 2 52 USER S MANUAL E Knee Point Marker nme I poo Wies DIER TC BB Semer EE T EXCITATION PLOT ASA 10750 KNEE MARKER LY MLA i d E Figure 6 Typical EZCT 52 Graphic Report EZCT 52 USER S MANUAL REV1 3 3 Working With Test Records 3 3 1 Restoring and Printing a Test Record From
36. The following screen will be displayed If you would like to cancel the erasure process press the STOP key No test plans will be erased and you will be returned to the START UP menu Press the ENTER key to continue with the erasure process The following screen will be displayed while the test plans are being erased E EZCT 52 USER S MANUAL 1 The following screen will be displayed after all test plans have been erased from the USB Flash drive Press any key to return to the START UP REV1 2 52 USER S MANUAL 3 4 7 Loading a Test Plan from the EZCT S2A s Flash EEPROM To use a test plan for running a test it must first be loaded into the working memory To load a test plan from the EZCT S2A s Flash EEPROM into the working memory a Start from the START UP menu ia EUH TEST 16 18 EE 18 24 25 5 TEST Pohs 4 DIAGHOSTIC Press the 3 key TEST PLANS b The following screen will be displayed LOAD TEST PLANH 2 UNLOAD TEST PLAN PLAN DIRECTORY 4 EXTRACT TEST PLAN Ja PRIHT TEST FLAH Sa ERASE TEST FLAH COPY TO THUME H8 Press the 1 key LOAD TEST PLAN c The following screen will be displayed LOAD TEST HUMBER The above screen will be displayed only if a USB Flash drive is NOT connected to the EZCT 52 5 USB Flash drive port If a USB Flash drive is connected the following screen will be displayed NOTE 5 BS 1
37. USER S MANUAL EZCT 524 CURRENT TRANSFORMER TESTER os E e EME TURN OFF Vanguard mengen Co Inc PUSH Ontario California 28001 Vanguard Instruments Company Inc 1520 S Hellman Ave Ontario California 91761 USA March 2014 Revision 1 EZCT S2A USER S MANUAL REV1 SAFETY SUMMARY FOLLOW EXACT OPERATING PROCEDURES Any deviation from the procedures described in this User s Manual may create one or more safety hazards may damage the EZCT 52 or cause errors in the test results Vanguard Instruments Company Inc assumes no liability for unsafe or improper use of the EZCT 52 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 WARNINGS AND CAUTIONS The EZCT S2A can produce a voltage up to 1 500 Vac that can cause severe injury and or equipment damage Due to this reason the EZCT S2A shall be used only by trained operators The EZCT S2A s X output terminals are rated to 1 500 Vac working voltage Any voltage above 1 500 Vac will damage the input circuitry All devices under test shall be off line and fully isolated Never attempt to test any current transformer still connected to a circuit All current transformer terminals shall be isolated before conducting test with the EZCT 52 Always ground the EZCT S2A to a substation ground before conne
38. UT POWER MEASUREMENT METHOD TEST OUTPUT VOLTAGES VOLTAGE READING RANGE CURRENT READING RANGE CURRENT RATIO RANGE PHASE ANGLE MEASUREMENT DISPLAY PRINTER COMPUTER INTERFACES EXTERNAL DATA STORAGE PC SOFTWARE INTERNAL TEST RECORD STORAGE INTERNAL TEST PLAN STORAGE SAFETY ENVIRONMENT HUMIDITY MAX ALTITUDE MAX CABLES WARRANTY Portable current transformer test set 16 8 W x 12 6 H x 12 D 42 7 cm x 32 cm x 26 9 cm Weight 55 Ibs 25 kg 100 120 Vac 200 240 Vac factory pre set 50 Hz 60 Hz ANSI IEEE C57 12 90 IEC 60044 1 and ANSI IEEE C57 13 1 standards 0 50 Vac Q 10A max 0 250 Vac Q 10A max 0 500 Vac max 0 1500 Vac 1 2A max 0 2 200 Vac Accuracy 1 0 of reading 1 volt 0 10A Accuracy 1 0 of reading 0 02A 0 8 999 0 1 1000 1999 0 3 2000 5000 1 0 360 degrees Accuracy 1 0 degree Back lit LCD Screen 240 x 128 dot graphic 114mm x 64mm viewable in bright sunlight and low light levels Built in 4 5 inch wide thermal printer One RS 232C port 115k baud one USB port One USB Flash drive interface port Flash drive not included Windows XP Vista based CT Analysis software is included with purchase price Stores 140 test records Each test record may contain up to 10 sets of excitation resistance and ratio data Stores 128 test plans Each test plan can store 10 excitation test voltage and current settings Designed t
39. ZCT x2 H2 M o e MU M gt PHASE 7 H1 BUSHING CT 52 EZCT 041122ATRTO2 x3 Figure 4 Bushing CT Connection on Y Transformer REV1 2 52 USER S MANUAL 3 2 Performing Tests 3 2 1 Entering Test Record Header Information You can enter the test record header information before performing tests The record header includes identifying information such as the company station circuit model number etc Once the header information has been entered it will apply to all subsequent test records To enter the header information a When the unit is turned on and the firmware has been loaded you will be presented with the START UP menu as shown below la EUH TEST 18 2 SETUP 1B 14 25 4 TEST PLANS 4 DIAGHOSTIC Press the 2 key SETUP b The following screen will be displayed RECORD 11 FRIHT RECORD RECORD DIRECTORY SAVE RES RECORD ERASE RECORD HEST FAGE m On P NEI Press the 1 key RECORD ID The following screen will be displayed COMPANY YAMGUART TL To POSITION ENTER TO ACCEPT Type the company name using the alpha numeric keypad When pressing a key the corresponding number on the key will be displayed first Pressing the key again will display the first letter on the key Pressing the key again will display the second letter on the key For example to type the letter you must press the 2 key twice To erase the char
40. acter at the cursor position press the CLEAR key Press the PAPER Contrast key to move to the next character Press the PAPER Contrast key to move to the previous character Press the ENTER key when you are done typing the company name EZCT S2A USER S MANUAL REV1 d The following screen will be displayed STATION LAE T TO FOSITIOH ENTER TO Type the station name using the alpha numeric keypad and then press the ENTER key e The following screen will be displayed CIRCUIT CIRCUIT 1 FOSITIOH ENTER TO ACCEPT Type the circuit information using the alpha numeric keypad and then press the ENTER key f Thefollowing screen will be displayed POSITION ENTER ACCEPT Type the manufacturer name using the alpha numeric keypad and then press the ENTER key g The following screen will be displayed MODEL TL POSITION ENTER TO Type the model information using the alpha numeric keypad and then press the ENTER key 20 REV1 2 52 USER S MANUAL h The following screen will be displayed SERIAL BN RE RE ENTER TO ACCEPT Type the serial number using the alpha numeric keypad and then press the ENTER key The following screen will be displayed COMMENTS amp POSITION
41. cting the test cables to a transformer 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 EZCT S2A test unit To ensure that all designed safety features are maintained it is highly recommended that repairs be performed only by Vanguard Instruments Company factory personnel or by an authorized repair service provider Unauthorized modifications can cause safety hazards and will void the manufacturer s warranty WARNING Do not remove test leads during a test Failure to heed this warning can result in electrical shock to personnel and damage to the equipment REV1 2 52 USER S MANUAL TABLE OF CONTENTS CONVENTIONS USED IN THIS DOCUMENT 2222 1 LO INTRODUCTION 2 1 1 General Description and ENEE 2 1 2 Green BEE 3 1 39 Kee ie HR ee tte ei E 4 L4 EZ SZA and a UIS 5 20 PRIE T RRE 7 Z4 eege e 7 2 2 LCD Screen Contrast Control 7 23 Primer raper 7 2A PART eS o Tm 30 Oe OR 9 3 1 EZCT S2A Cable Connections 4 9 22 Peres T6 Seas eo oe DECANI UE 11 3 2 1 Entering Test Record
42. e instructions in section 3 4 3 c 0 EZCT S2A USER S MANUAL 1 e The following screen will be displayed FLAW maa LOSTET SAVE PL o IHTERHBALL 1 YES 2 1 YES Press the 1 key if you would like the loaded test plan to be also saved in the EZCT S2A s Flash EEPROM Any existing test plans in the EZCT S2A s Flash EEPROM will not be over written The EZCT S2A will automatically assign a new test plan number and store the test plan in the next available memory location The following screen will be displayed TEST PLAN SAVED Press any key to return to the START UP menu 2 NO Press the 2 key if you do not want to save the loaded test plan in the EZCT S2A s Flash EEPROM It will be loaded into the working memory and you will be returned to the START UP menu REV1 2 52 USER S MANUAL 3 4 9 Running a Test Using a Loaded Test Plan Once a test plan has been loaded into the working memory see sections 3 4 7 and 3 4 8 for directions it can be used to run a test To run a test using a loaded test plan a Make sure a test plan has been loaded into the working memory and then start from the START UP menu TEST 0216 10 18 24 25 TEST 4 DIAGHOSTIC Press the 1 key RUN TEST b The following screen will be displayed this screen will only be displayed if a test plan has been loaded first TEST PLAN LOADED RUN WITH PR
43. e Diagnostics test mode displays the output voltage at the X leads the voltage sensed the H leads Vi and the X voltage excitation current These values can then be verified using an external volt meter and ampere meter The Diagnostic Test mode uses the X1 X2 taps To perform a diagnostic test a Start from the START UP menu TEST Bae le In SE TUF Leis Ze 22 TEST PLANS DIAGNOSTIC Roi BIG Press the 4 key DIAGNOSTIC b The following screen will be displayed ELECT VOLTAGE FAMGE Ep ay cb lobby wk Pp UI Select the maximum output voltage on the X terminals by pressing the corresponding key 1 141 The following screen will be displayed CAUTION CABLES WILL BE EMERGIZED ENTER TO CONTINUE Press the ENTER key to continue REV1 2 52 USER S MANUAL d The following screen will be displayed and the V Vi and values will be continuously updated for 15 seconds DIAGHOSTIC B BT A AGIA SS E You can press the PAPER Contrast PAPER v Contrast key to increase or decrease the V voltage respectively You can press the STOP key to end the test immediately and return to the START UP menu The test will automatically end after 15 seconds and you will be returned to the START UP menu EZCT 52 USER S MANUAL 1 5 2 Verifying the EZCT S2A s V Sense Circ
44. e following screen will be displayed THIS TEST DES Press the 1 key YES to keep the test results REV1 2 52 USER S MANUAL n The following screen will be displayed Press any key to continue The following screen will be displayed Press the 2 key NO p The following screen will be displayed Press the 1 key YES to save the record The following screen will be displayed momentarily EZCT 52 USER S MANUAL 1 q The following confirmation screen will then be displayed Press any key to return to the START UP menu REV1 2 52 USER S MANUAL EXCITATION TEST RESULTS COMPANY VANGUARD STAT ON LAB MER MODEL Za Pl COMMENT S OPERAT OR CT DATA POINT CUUR a CN a OHMS gt O OFtDOe O 2oo O gt OBLE Li gt cl D 5 5 Dt a3 0 2 2 OFOG ae 4 246 aam SC Esch lt LOBO IL a 299 5 Z 2 lt Late 39 4 5 lt gt 5 lt L596 sch lt B O lt gt 1 lt gt gt 5 sot 1 lt gt 22 G66 F L 1 1 Z292 TTO 22 gt e UU 1 22 ob 5 5 7 7s Le 13 4454 T5 aoo 21 lt 4 2222 v Let 5 6 1 gt gt 6654 rs
45. eliminated The turns ratio measured by the EZCT or any electronic TTR is calculated as follows V1 Ratio V2 H1 H2 Figure 22 From the name plate of the CT show in table below the turns ration can be calculated as follows 1200 5A X1 X5 1000 5A X2 X5 Ratio 1 5 240 Ratio 2 5 200 Bif 00000002 0 Calculated Ratio 1 20 EZCT S2A USER S MANUAL 1 A common practice for verifying the CT turns ratio in the field is to apply an AC voltage to the CT secondary full winding X1 X5 A volt meter can be used to verify the voltage drop across the CT terminals For example if a 120Vac voltage is applied to the X1 X5 of this CT the voltage reading across X2 X5 shall be expected as follows Voltage X2 X5 120 V x 55 100 V H1 V1 120V V2 100V H2 Figure 23 This method also eliminates the effect of the reactor winding on the H1 H2 terminals REV1 2 52 USER S MANUAL ALSTOM SHUNT REACTOR SERIAL NUMBER INSTRUCTION BOOK 111 583 5 0 PHASE 3 STANDARD COOLING TYPE FREQUENCY Hz INSULATING LIQUID NAPHTHENIC ASTM D 3487 88 MINERAL OIL CONTAINS NO PCB YEAR IMPEDANCE PER PHASE AT amp 0Hz AND 75 23732 OHMS CORF TYPE DESIGN SOUND LEVEL amp 5O0MvAr lt 8068 WINDING CONDUCTOR COPPER RATED VOLTAGE kv 2 TEMPERATURES CORE AND COILS MASS 70768 Jib 32109 kg 345
46. ess the 1 key ERASE INTERNAL PLAN The following screen will be displayed EZCT 52 USER S MANUAL REV1 ERASE TEST 1 ERASE SINGLE 2 ERASE ALL FLAHS Continue with the steps below 1 ERASE SINGLE PLAN Press the 1 key if you would like to erase a single test plan The following screen will be displayed ERASE TEST Type the test plan number that you would like to erase and press the ENTER key e You can press the STOP key to cancel the process e f you do not know the test plan number you can print a test NOTES plan directory using the instructions in section 3 4 2 The selected test plan will be erased and the following screen will be displayed TEST HUMBER 1 ERASED Press any key to return to the START UP menu 2 ERASE ALL PLANS Press the 2 key if you would like to erase all test plans The following screen will be displayed E REV1 2 52 USER S MANUAL If you would like to cancel the erasure process press the STOP key No test plans will be erased and you will be returned to the START UP menu Press the ENTER key to continue with the erasure process The following screen will be displayed while the test plans are being erased The following screen will be displayed after all of the test plans have been erased Press any key to return to the START UP menu EZCT S2A USER S MA
47. est the V reading is erratic The turns ratio reading is incorrect Saturation test is correct but turns ratio test is erroneous Turns ratio test of a CT mounted on a transformer bushing is incorrect Probable Cause The EZCT S2A X cables are driving a short circuit The EZCT S2A X cable is driving an opened circuit The test voltage selected for the test was too low You can quickly verify if the CT was demagnetized by looking at the last excitation graph The EZCT S2A X cable may be opened Each X cable has two conductors going from the clip end to the X connector on the front panel If one of the conductors is opened the V readings will be erratic No H cable connection No excitation voltage cables problem Transformer windings opposite side of CT windings may not be shorted Suggested Solution Check CT shorting screws e Check X lead connections e Check the CT terminal connection e Select a higher test voltage for the test e Remove X cables from the EZCT S2A and the CT terminals e Check cable integrity using an Ohm Meter e Check the H cable connection e Check the X cable connection e Check the V cable connection e Check the V cable integrity with an Ohmmeter e See Figure 4 EZCT 52 USER S MANUAL 1 6 0 UPGRADING FIRMWARE The EZCT S2A s firmware is user upgradeable You can download the latest firmware from the Vanguard Instruments
48. he Working Memory To unload the test plan from the working memory and clear all the test plan parameters Start from the START UP menu TEST le 1a EENS 18 24 25 TEST Pohs 4 DIAGHOSTIC Press the 3 key TEST PLANS The following screen will be displayed LOAD TEST UNLOAD TEST PLAH FLAW DIRECTORY ES TRACT TEST Jw TEST FLAN ERASE TEST CORY TO THUME DRIVE FJ m el Un ON Za Lei Press the 2 key UNLOAD TEST PLAN The following screen will be displayed TEST FLAN UNLOADED Press any key to return to the START UP menu REV1 2 52 USER S MANUAL 4 0 CHANGING SETUP PARAMETERS 4 1 Setting the Knee Point Marker Use the steps below to change the knee point marker for the excitation graph a Start from the START UP menu FUH TEST SETUP 10 24 25 TEST PLANS 4 DIAGHOSTIC Press the 2 key SETUP b The following screen will be displayed RECORD ID RECORD RECORD RECORD ERASE RECORD HEAT Nit Press the 6 key NEXT PAGE The following screen will be displayed 2 BURIED CT DELTA POINT MARKER 4 DATA Press the 3 key KNEE POINT MARKER EZCT 52 USER S MANUAL REV1 d The following screen will be displayed Press
49. ic purposes This will print a table of current and voltage values from the last test performed as well as all stored test records To print the raw buffer data a Start from the START UP menu Press the 2 key SETUP b The following screen will be displayed Press the 6 key NEXT PAGE c The following screen will be displayed Press the 4 key PRINT RAW DATA The raw buffer data will be printed and you will be returned to the START UP menu A sample printout is shown in Figure 14 o d Qr mmamo omoamuo ru FH UNTER el E E SES 2NOD Or nt Cd 0 42 0 H DDIDIDID S t INN DODDOLT I T DN 9 GODS N OA NNNNNNNNNNNNN NANNING m NNNNNININNINNNNNeS a 0 2 ME a 2 DORDEAMNN O00 0000000000000000 EE L 0 QooooooooooDcOoO0O0000000000000000 0000000000000000000000000600000 0000000000000000000000000000000 Figure 14 Sample Raw Data Printout lt 2 Z t 2 H cc LU GA lt N GA UO N LU gt LU cc EZCT 52 USER S MANUAL REV1 5 0 DIAGNOSTICS VERIFICATION AND TROUBLESHOOTING 5 1 Performing a Diagnostics Test Th
50. io and winding polarity tests automatically The EZCT S2A automatically raises and lowers the excitation test voltage without any operator intervention With up to 1500 Vac excitation test voltage available the EZCT S2A can easily perform excitation tests on very large CT s Excitation Test The CT excitation test is performed using the ANSI IEEE C57 13 1 IEC 60044 1 test method The test voltage range for the CT excitation test 50 Vac 250 Vac 500 Vac or 1500 Vac can be selected and then the test voltage is raised and lowered automatically by the EZCT S2A The test voltage and current data are collected and stored in the unit s internal memory Up to 10 CT excitation and current ratio tests can be stored in one test record IEEE 30 IEEE 45 ANSI IEC 60044 1 10 50 knee point voltages are also calculated and printed on the test report Once the test is completed test results can be printed and excitation curves can be plotted on the built in 4 5 inch wide thermal printer CT Ratio and Polarity Tests The EZCT S2A determines the CT current ratio using the ANSI IEEE C57 12 90 measurement method A test voltage is applied to the CT s secondary terminals and the induced voltage is measured through the CT s H1 and H2 terminals The CT current ratio and polarity are displayed on the screen and stored in memory The current ratio measuring range is from 0 8 to 5 000 The CT winding polarity is displayed as a sign in phase or a sign o
51. l be restored to the working memory and you will be returned to the START UP menu If you would like to print the test record press the 1 key YES Continue to step d d The following screen will be displayed OPTIONS 1 FULL DATA 2 ABBREVIATED DATA Press the 1 key to print the tabulated data and graphics results on the thermal printer The test record will be restored to the working memory and will be printed on the thermal printer and then you will be returned to the START UP menu Press the 2 key to print the test report and graphic results on the thermal printer without the excitation voltage and current data points The test record will be restored to the working memory and will be printed on the thermal printer and then you will be returned to the START UP menu REV1 2 52 USER S MANUAL 3 3 2 Restoring and Printing a Test Record From a USB Flash Drive You can restore a test record from a USB Flash drive to the EZCT S2A s working memory using the steps below a Make sure the USB Flash drive containing the test record s is inserted in the EZCT S2A s USB Flash drive port USB MEM port Then start from the START UP menu a FUH TEST 14 iG ea 39 39 TEST PLANS i DIAGHOSTIC Press the 2 key SETUP b The following screen will be displayed RECORD ID FRIHT RECORD RECORD DIRECTORY SAYE RES RECORD ERASE RECORD HEST
52. nd graphics results on the thermal printer The test record will be printed on the thermal printer and you will be returned to the START UP menu Press the 2 key to print the test report and graphic results on the thermal printer without the excitation voltage and current data points The test record will be printed on the thermal printer and you will be returned to the START UP menu EZCT 52 USER S MANUAL REV1 3 3 4 Printing a Directory of Test Records Stored in the EZCT S2A s Memory You can print a directory of all the test records stored in the EZCT S2A s Flash EEPROM using the steps below a Start from the START UP menu FUH TEST SETUP 1B 24 272 a TEST FLAHS i DIAGHOSTIC Press the 2 key SETUP b The following screen will be displayed ID a PRIHT a RECORD DIRECTORY 4 RECORD a ERASE RECORD HEST PAGE Press the 3 key RECORD DIRECTORY c The following screen will be displayed DIRECTOR la FULL DIRECTORY da SHORT DIRECTORY The above screen will be displayed only if a USB Flash drive is NOT connected to EZCT S2A s USB Flash drive port If a USB Flash drive is connected the following screen will be displayed NOTE 5 1 INTERNAL DIRECTORY da THU ME DIR Press the 1 key INTERNAL DIRECTORY The following screen will be displayed _ REV1 2 52 USER S MANUAL
53. o 10 test definitions can be stored per test plan and up to 128 CT test plans can be stored in the EZCT S2A s Flash EEPROM The ability to use test plans makes CT testing an extremely simple process To perform a test the EZCT S2A is connected to the CT terminals and a test plan is selected to run 3 4 1 Extracting the Test Plan From a Test Record A test plan can be extracted from a test record for immediate or future use You can extract the test plan immediately after performing a test or you can extract the test plan from a restored test record see section 3 3 1 for instructions on how to restore a test record To extract a test plan from a test record a Either perform a test see section 3 2 or restore a test record see section 3 3 1 that you would like to extract the test plan from b Start from the START UP menu EUH TEST Ba le In SE TUF 18 24 25 TEST PLANS DIAGHOSTIC Press the 3 key TEST PLANS c The following screen will be displayed LOAD TEST UNLOAD TEST FLAW PLAH DIRECTORY EXTRACT TEST PLAH TEST ERASE TEST LIPY THUNE DRIVE EZCT 52 USER S MANUAL REV1 Press the 4 key EXTRACT TEST PLAN d The following screen will be displayed The test plan will be extracted from the test record in the working memory and will be saved to the EZCT S2A s Flash EEPROM as a new test plan The test plan number will be automatically incremented by the EZCT S
54. o meet UL 61010A 1 and CAN CSA C22 2 No 1010 1 92 standards Operating 10 to 50 C 15 to 122 F Storage 30 C to 70 C 22 to 158 F 90 RH 40 C 104 F non condensing 2000m 6562 ft to fully safety specifications Two 20 foot X cable sets One 35 foot H cable set power cord One cable carrying duffel bag One year on parts and labor REV1 2 52 USER S MANUAL 1 4 EZCT S2A Controls and Indicators The EZCT S2A s controls and indicators are shown in Figure 1 below A leader line with an index number points to each control and indicator which is cross referenced to a functional description in Table 2 The table describes the function of each item on the control panel The purpose of the controls and indicators may seem obvious but users should become familiar with them before using the EZCT S2A 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 e s2A CURRENT TRANSFORMER TESTER E OFF 4 Vanguard Instruments Inc PUSH Ontario California USA Figure 1 EZCT S2A Controls and Indicators EZCT S2A USER S MANUAL 1 Table 2 Functional Descriptions of EZCT S2A Controls and Indicators Item Number Panel Markings X H 110 120 Vac 12A 50 60Hz GROUND RS 232C USB PC USB MEM HIGH VOLTAGE PRESENT EMERGENCY TURN
55. rther information please see the Software User s Manual REV1 2 52 USER S MANUAL 3 0 OPERATING PROCEDURES 3 1 EZCT S2A Cable Connections Always connect the EZCT S2A to the substation ground before connecting any test cables The X cable connections are required to run the current transformer excitation test The H and X cable connections are required to run the transformer turns ratio test A typical excitation and ratio test connection is shown in Figure 2 Transformer bushing CT connections for Delta and Y transformers are shown in Figure 3 and Figure 4 respectively optional ground S2A CURRENT TRANSFORMER TESTER Figure 2 Typical EZCT S2A Excitation and Ratio Test Cable Connection EZCT 52 USER S MANUAL 1 0 NOTE 1 JUMPER INSTALLATION ON SECONDARY WINDING H1 JUMPER EZCT CABLES TYP 3 PLACES H2 X1 amp X2 I EZCT B PHASE BUSHING CT xi I d A PHASE C PHASE BUSHING CT BUSHING CT E Ep H1 H2 EZCT EZCT X1 amp X2 X1 amp X2 EZCT EZCT 041122ATRTO1 Figure 3 Bushing CT Connection on Delta Transformer 0 JUMPER i m CABLES CABLES TYP 3 PLACES TYP 3 PLACES H1 EZCT X1 amp X2 NOTES EZCT 1 JUMPER INSTALLATION ON PRIMARY WINDING e X1 amp X2 EZCT gm 2 4 BUSHING LX H2 x1 EZCT E d xi 717711 E A I X1 X2 A PHASE EZCT BUSHING CT H1 De EZCT E
56. s since it also provides instructions for making the proper CT cable connections Test plans can be created on the EZCT S2A itself or created on a PC and downloaded to the EZCT S2A via the unit s built in RS 232C or USB port External Data Storage The EZCT S2A features a standard USB Flash drive interface that makes it very convenient to store and transfer test records and test plans By plugging in a USB Flash drive you can quickly transfer your test records and test plans between a computer and the EZCT S2A without the need to connect the unit to the computer Computer Interface The EZCT S2A can be used as a stand alone unit or can be computer controlled via the built in RS 232C or USB interfaces A Windows XP Vista based Current Transformer Analysis software application is provided with each EZCT 52 This software be used to retrieve test records from the EZCT 52 create test plans download test plans to the EZCT S2A and can also be used to run CT tests from the PC Tabulated test records can be exported in Microsoft Excel format 1 2 Furnished Accessories The EZCT S2A comes furnished with the following e 1 Power Cord e 220 foot X Cable Sets e 135 foot Cable Set e One RS 232C serial cable e USB cable e Ground Cables e Cable carrying duffel bag E EZCT 52 USER S MANUAL REV1 1 3 Technical Specifications Table 1 EZCT S2A Technical Specifications TYPE PHYSICAL SPECIFICATIONS INP
57. st Results Elements 22 Table 4 Description of Test Plan Elements a occi oves su eer 50 LIST OF FIGURES Figure 1 EZCT S2A Controls 5 Figure 2 Typical EZCT 52 Excitation and Ratio Test Cable 9 Figure 3 Bushing CT Connection on Delta Transformer eene 10 Figure 4 Bushing CT Connection on Y Transformer eene enne nnns 10 Figure 5 Typical EZCT S2A Tabulated Report Printout eene 21 Figure 6 Typical EZCT S2A Graphic Report 23 Figure 7 Typical Internal Test Record Directory Printout nene 36 Figure 8 Typical EZCT S2A Flash EEPROM Test Plan Directory 46 Figure 9 Typical USB Flash Drive Test Plan Directory 48 Figure 10 Typical Test Plan Printout E 50 Figure 11 Graphic Report Showing Knee Point 69 Figure 12 Buried CT in a Delta Transformer Illustration 1 73 Figure 13 Buried CT in a Delta Transformer Illustration 2 73 Figure 14 Sample Raw Data brintout nennen nnne nnns annees 77 Figure 15 EZCT 52 V Verification Test Conpnechons 80 80 Figure 16 EZCT 52 Verification Test Connections enne 81 Figure 17 EZCT 52 Turns Ratio Verification Test
58. then press ENTER key The test record s graph will be displayed as shown below OOO Too SAT BATI ON PLOT Press any key to continue EZCT 52 USER S MANUAL 1 The following screen will be displayed If you do not want to print the test record press the 2 key NO The test record will be restored to the working memory and you will be returned to the START UP menu If you would like to print the test record press the 1 key YES Continue to step d REV1 2 52 USER S MANUAL 2 SCROLL TO SELECT Press the 2 key if you would like to scroll through a directory of the stored test records The following screen will be displayed RECORD DIRECTORY SCROLL FHD TO SCROLL Rvs Press the PAPER Contrast button or the PAPER v Contrast key to display the next or previous test record respectively The test record information will be displayed as shown Hi E2148 15 18 ei ques ps SHA 3S5 LIE i MITSUBISHI ELECTRIC When you have located the test record that you would like to restore press the ENTER key The test record s graph will be displayed as shown below SAT BATI ON PLOT Press any key to continue EZCT S2A USER S MANUAL REV1 The following screen will be displayed RECORD RESTORED RECORD If you do not want print the test record press 2 key NO The test record wil
59. uit Using an External Meter The excitation voltage V4 sensed by EZCT 52 can be verified using an external RMS volt meter Follow the steps below to verify the EZCT S2A s V sense circuit a Connect the X cables to an RMS volt meter as shown in Figure 15 b Select the EZCT S2A s Diagnostics mode see section 5 1 c Press the PAPER Contrast key to raise the V voltage d Verify the V voltage displayed on the EZCT S2A LCD screen against the value displayed on the external volt meter e Press the STOP key to end the test X2 EE ZCT 524 CURRENT TRANSFORMER TESTER BAA JKL CONTRAST raren EE UY Vanguard Instruments Co Inc Ontario California USA Figure 15 EZCT S2A V Verification Test Connections REV1 2 52 USER S MANUAL 5 3 Verifying the EZCT S2A s lx Sense Circuit Using an External Meter You can verify the excitation current sensed by the EZCT 52 by using an external RMS ampere meter Follow the steps below to verify the EZCT S2A s sense circuit a Connect the X cables to a power resistor and an RMS ampere meter as shown in Figure 16 b Select the EZCT S2A s Diagnostics mode see section 5 1 c Pressthe PAPER Contrast key to raise the V voltage d Verify the voltage displayed on the EZCT S2A s LCD screen against the value displayed on the external RMS ampere meter e Press the STOP key to end the test POWER RESISTOR L
60. ured will be wrong REV1 2 52 USER S MANUAL Since this is a single phase transformer and the transformer secondary winding is accessible the user can apply a jumper to short out the transformer secondary winding as shown in Figure 20 By shorting out the transformer secondary winding the user can eliminate most of the V3 voltage V3 0V Now the turns ratio will be V1 Ratio V2 H1 Install ov Jumper P H2 X2 Figure 20 EZCT S2A USER S MANUAL 1 Figure 21 show a CT mounted on a typical shunt reactor This configuration is very similar to the CT mounted on a single phase transformer the main difference being the lack of the secondary winding The turns ratio in this case will be Ratio V2 V3 Figure 21 Since there is no secondary winding on the shunt reactor the turns ratio measurement from using this method will always have some built in error The amount of error depends on the size of the reactor winding and the number of turns on the CT s secondary winding The user does not have an alternative method for verifying the CT turns ratio in this situation since there is no secondary winding and a jumper can t be used REV1 2 52 USER S MANUAL Figure 22 show a CT with 5 taps The turns ratio of the CT can be measured by treating the CT secondary winding as an auto transformer When using this method the effect of the shunt reactor winding is totally
61. ut of phase and is annotated with the phase angle in degrees User Interface and Display The EZCT S2A features a back lit LCD screen 240 x 128 dot graphic that is viewable in both bright sunlight and low light levels A rugged alpha numeric membrane keypad is used to control the unit Built in Thermal Printer A built in 4 5 inch wide thermal printer can print the current transformer test report and plot the excitation curves REV1 2 52 USER S MANUAL Test Record Header Information The test record header information can include the company name substation name circuit ID manufacturer CT serial number operator s name and test record comments In addition to the test record header a 20 character test description for each test in the record can also be entered Internal Test Record Storage Capacity The EZCT S2A can store up to 140 test records in Flash EEPROM Each test record may contain up to 10 excitation curves current ratio readings and winding polarity readings Test records can be recalled and printed on the built in thermal printer Internal Test Plan Storage Capacity The EZCT S2A can store up to 128 CT test plans in Flash EEPROM A test plan defines the excitation test voltage and current selection CT nameplate ratio and CT winding terminal connection instructions for each test Up to 10 test definitions can be stored in each test plan The use of a test plan greatly simplifies the CT testing proces

EZCT-S2A User`s Manual - Vanguard Instruments Company, Inc.

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