EZCT and EZCT-10 - Vanguard Instruments Company, Inc.
Contents
1. 55 a a c qe 56 4 57 e RR m 58 EUNE dmm Vo Oe 59 c 59 REV4 EZCT EZCT 10 USER S MANUAL CONVENTIONS USED IN THIS DOCUMENT This document uses the following conventions A key switch or knob on the EZCT EZCT 10 is indicated as KEY SWITCH KNOB Menu options are referenced as MENU OPTION Both the EZCT and the EZCT 10 are simply referred to as EZCT in this manual The exact model number is used only in cases where differences between the units are discussed Screen and menu names are referenced as SCREEN MENU The terms test record and test shot are used interchangeably EZCT EZCT 10 LCD screen output is shown as Warning messages are indicated as Important notes are indicated as 4 EZCT EZCT 10 USER S MANUAL REV4 1 0 INTRODUCTION 1 1 General Description and Features The EZCT is a microprocessor based current transformer test set This rugged and portable test set can perform the current transformer CT excitation CT current ratio and winding polarity tests Current transformers can be tested in their field mounted configuration eliminating the need to remove bushings or current transforme2. 8 OPCINE mmm 8 2 2 ERD Screem Conrada i Cont ola 8 23 PH terPSper Ol 8 24 tod i DNI DM UU EIU 8 222 OPERATINGIPROCEDUBES TOTEM MIU TIPP PU 10 d EZ GT Cale COMMS CUO ETE 10 32 ee eee eee eee 13 3 2 1 Entering Test Record Header Information ie 13 3 2 2 Performing an Excitation and Ratio 16 3 2 3 Performing a Turns Ratio Only 20 0 0 0 00 23 3 329 Working With Test Dn UE 27 3 3 1 Printing a Test Record Directory nemen nnns 27 3 3 2 Restoring and Printing a Test Record From Flash EEPROM 29 3 3 3 Printing a Restored Test ReCofU usse isst siete sine 32 3 3 4 Erasing Test Records From the Flash EEPROM nnne 33 4 0 CHANGING SETUP PARAMETERS 35 4 1 Setting the Knee Point Marker 35 4 2 Selecting the Buried CT in Transformer Delta Option 37 4 2 1 Enabling the Buried CT in Transformer Delta 37 4 2 2 Disabling the Buried CT in Transform
3. add MEASUREO RATIO Bo 2 PERCENT ERROR POLARI T Y PHASE ANGL En CIT AT I ON TG ECI TAT I ON CUF Figure 8 Typical Turns Ratio Only Test Report Printout ES REV4 EZCT EZCT 10 USER S MANUAL 3 3 Working With Test Records 3 3 1 Printing a Test Record Directory You can print a directory of the test records stored in the EZCT s Flash EEPROM on the unit s built in thermal printer To print a test record directory a Start from the START UP menu 1 RUN TEST 08 27 09 SETUP 10 10 05 3 DIAGNOSTIC Press the 2 key SETUP b The following screen will be displayed 1 RECORD ID PRINT RECORD 3 RESTORE RECORD 4 NEXT PAGE Press the 3 key RESTORE RECORD c The following screen will be displayed 1 RESTORE RECORD RECORD DIRECTORY 3 ERASE RECORDS Press the 2 key RECORD DIRECTORY d The following screen will be displayed PRINT DIRECTORY l FULL DIRECTORY SHORT DIRECTORY Press the 1 key FULL DIRECTORY to print a list of all the records stored in the unit s Flash EEPROM memory Press the 2 key SHORT DIRECTORY to print a list of the last 10 records stored in the unit s Flash EEPROM memory The test record directory will be printed on the built in thermal printer and you will be returned to the START UP menu A sample test record directory is shown in Figure 9 I EZCT EZCT 10 USER S MANUAL REV 4 T
4. RECORD ID PRINT RECORD RESTORE RECORD NEXT PAGE Press the 3 key RESTORE RECORD c The following screen will be displayed L RESTORE RECORD RECORD DIRECTORY 3 ERASE RECORDS Press the 1 key RESTORE RECORD d The following screen will be displayed RESTORE RECORD l ENTER RECORD NUMBER SCROLL TO SELECT 1 ENTER RECORD NUMBER Press the 1 key ENTER RECORD NUMBER if you know the record number If you don t know the record number you can first print a test record directory for reference see section 3 3 1 The following screen will be displayed RESTORE RECORD NUMBER EZCT EZCT 10 USER S MANUAL REV4 2 Type the record number using the alpha numeric keypad and then press the ENTER key Continue to step e SCROLL TO SELECT Press the 2 key SCROLL TO SELECT to scroll through a directory of test records and select the desired test record from the directory The following screen will be displayed RECORDN DIRECTORY TO SCROLL FWD DUN TO SCROLL RVS Press the PAPER Contrast key to scroll forward through the record directory or press the PAPER v Contrast key to scroll backwards through the record directory A screen will be displayed showing some details about the current test record 3 05 27 09 14 09 PZ ABB Once you have located the test record you would like to restore press the ENTER key Continue to step e e Th
5. Press the 4 key NEXT PAGE c The following screen will be displayed COMPUTER CONTROL SET TIME KNEE POINT MARKER NEXT PAGE Press the 4 key NEXT PAGE d The following screen will be displayed 1 SET 7 PRINT ON OFF BURIED CT IN DELTA Press the 1 key SET Z PRINT ON OFF EZCT EZCT 10 USER S MANUAL REV 4 e The following screen will be displayed Press the 1 key YES if you would like the impedance values to be printed on the tabulated report The option will be set and you will be returned to the START UP menu Press the 2 key NO if you do not want the impedance values to be printed on the tabulated report The option will be set and you will be returned to the START UP menu REV4 EZCT EZCT 10 USER S MANUAL DATE 907 92 06 TIME 13 41 21 VANGUARD INSTRUMENTS SHOP 1234 ABB COMPANY STATION CIRCUIT 2 DEMO HAI COMMENTS OPERATOR TEST NUMBER 1 Impedance Values CT DATA POINTS lt gt 270 35 404 3 619 0 743 2 Se1 4 oT 1005 5 1021 7 LLPP 25 L290 6 CUR cm YTG cv z o oO o004 oO o006 oO O010 O O13 O 015 O 09018 22 27 oO 933 22 00N0Ub UNPF uUNPPP NhOUNONUUPP 10000450000 32 OoO o0d4o0 O 0O50 O61 o o75 o o9s 11 4 4 353 O 212 Oo 2589 o 333 Oo 404 o 4977Y O
6. 1 3 2 EZCT 10 Technical Specifications Table 2 EZCT 10 Technical Specifications TYPE PHYSICAL SPECIFICATIONS INPUT POWER MEASUREMENT METHOD OUTPUT TEST OUTPUT VOLTAGES VOLTAGE READING RANGE CURRENT READING RANGE CURRENT RATIO RANGE PHASE ANGLE MEASUREMENT DISPLAY PRINTER COMPUTER INTERFACES PC SOFTWARE INTERNAL TEST RECORD STORAGE INTERNAL TEST HEADER STORAGE SAFETY ENVIRONMENT CABLES OPTIONS 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 or 200 240 Vac factory pre set 50 60 Hz ANSI IEEE C57 12 90 IEC 60044 1 and ANSI IEEE C57 13 1 0 50 Vac 10A max 0 200 Vac 10A max 0 1200 Vac 1 5A max 5 min on 10 min off 0 1 250 Vac Accuracy 1 0 of reading 0 5 volt 0 10A Accuracy 1 0 of reading 0 02A 0 8 99 0 5 100 999 1 0 1 000 5 000 2 0 360 degrees Accuracy 1 0 degree Back lit LCD Screen 20 characters by 4 lines viewable in bright sunlight and low light levels Built in 4 5 inch wide thermal printer One RS 232C port One USB port Windows XP Vista based software is included with purchase price Stores 128 test records Each test record may contain up to 10 excitation and ratio data sets Stores 10 test header records Designed to meet UL 61010A 1 and CAN CSA C22 2 No 1010 1 92 standards Operating 10 to 50 C 15 F t
7. 1 EXCITATION amp RATIO RATIO ONLY Press the 2 key RATIO ONLY c The following screen will be displayed XFMR NAME PLATE RAT l YES NO 1 YES Press the 1 key YES to enter the name plate ratio The following screen will be displayed ENTER PLATE RATIO Input the first high side number using the numeric keypad If needed you can press the CLEAR key to clear the typed value at the cursor Press the ENTER key The following screen will be displayed LIN EZCT EZCT 10 USER S MANUAL REV4 ENTER PLATE RATIO 40 Input the second low side number using the numeric keypad and press the ENTER key ENTER PLATE RATIO 40 1 0 Continue to step d 2 NO Press the 2 key NO if you do not want to enter the name plate ratio Continue to step d d The following screen will be displayed SET NOW ENTER TO ACCEPT Vx 0 0 Vh 0 0000 1 0 0000 Turn the VOLTAGE CONTROL knob clockwise to set the test voltage to the desired value A 10 90Vac excitation voltage Vx is recommended for the turns ratio test As you turn the VOLTAGE CONTROL knob the screen will be updated showing the excitation voltage current and the calculated turns ratio as shown below SET NOU ENTER TO ACCEPT 0 Vh D e u 1 0 0848 RAT 80 065 Press the ENTER key REV4 EZCT EZCT 10 USER S MANUA
8. PRINTING REPORT PLEASE WAIT A typical EZCT tabulated report printout is shown in figure Figure 6 and the report elements are described in Error Reference source not found A typical EZCT excitation graph is shown in Figure 7 The following screen will be displayed when printing is finished KEEP THIS TEST YES NO Press the 1 key YES to keep the test The following screen will be displayed TEST SAVED Press the ENTER key to continue EZCT EZCT 10 USER S MANUAL REV 4 The following screen will be displayed Press the 2 key NO The following screen will be displayed Press the 1 key YES to save the test record The following screen will be displayed Press the ENTER key The following screen will be displayed Turn the VOLTAGE CONTROL knob counter clockwise to the zero point you will hear a click and will be unable to turn it anymore and you will be returned to the START UP menu REV4 EZCT EZCT 10 USER S MANUAL CI ESCITRIIUN TESI VANGUARD LAB COMPANY STATION CIRCUIT MER MODEL SEIN COMMENTS OPERATOR ABEB ECT lt lt gt i lt Cos lt gt oOo OOo C 2 gt O23 A 3 1 5 am a cm oOo OZO o dm a OZ3 gt gt 5 lt gt 4 lt gt lt ost lt lt O4 B LO gt OSO Lo 22 LA 2 1
9. YES to enter the name plate ratio The following screen will be displayed ENTER PLATE RATIO Input the first high side number using the numeric keypad If needed you can press the CLEAR key to clear the typed value at the cursor Press the ENTER key The following screen will be displayed ENTER PLATE RATIO 40 Input the second low side number using the numeric keypad and press the ENTER key ENTER PLATE RATIO 40 1 0 Continue to step h 2 NO Press the 2 key NO if you do not want to enter the name plate ratio Continue to step h h The following screen will be displayed SET NOW ENTER TO ACCEPT Vx 0 0 Vh 0 0000 1 0 0000 Turn the VOLTAGE CONTROL knob clockwise to set the test voltage to the desired value A 10 90Vac excitation voltage Vx is recommended for the turns ratio test SI REV4 EZCT EZCT 10 USER S MANUAL As you turn the VOLTAGE CONTROL knob the screen will be updated showing the excitation voltage current and the calculated turns ratio as shown below SET NOU ENTER TO ACCEPT 0 Vh 0 2747 1 0 0848 RAT 80 065 Press the ENTER key The following screen will be displayed PRINT TEST RESULTS 1 YES NO Press the 1 key YES to print the test results on the built in thermal printer The following screen will be displayed while the report is being printed
10. gt lt gt Lo 3 1 3 C lt 5 am ec d LA oOo 1 1 lt de S 1 lt gt L35399 5 5 D sir DSi OLI e 15 lt It or H1 e Bla L HZZO FOO 74 1 TI OoOo 477 ro gt gt gt gt 5 Soo 22 A b 339 G 2 L c 325 4 22 L BAO BA L Ses 2 lt lt Soa O INTERPOLATED DATA POINT S CUR CADI VIT lt CN gt OLO O lt C AB 3 C lt lt lt lt SOSIO Ao OBO ZO 4 LOQO gt lt ZOO 59 lt Foo 7a 1 5 lt lt lt BOO gt L ccc gt OOO Sea O ASA 10 S gt 0 Vp 66 12 VOLTS ASA LO SO ZAS AMPS ITEEE ZOOS VKP oo VOLTS IEEE Soc Tkp lt 203 AMPS ITEEE 450 VK Pp lt gt VOLTS IEEE 450 Ikp lt gt L583 AMPS N AMEPRLATE RATIO So COCO HEARSUREO RATIO BO lt gt ERROR gt LO 22 POLARRITY IN PHASE PHASE ANGLE gt gt DEG E CITATION TG 50 5 VOLT S E lt CITATION CUR Figure 6 Typical EZCT Tabulated Report Printout EZCT EZCT 10 USER S MANUAL Table 4 Descriptions of Tabulated Test Results Elements m Description Number 1 Recorded excitation voltages applied to CT secondary winding 2 Recorded excitation current readings on
11. CT secondary winding 3 Tabulated voltage current and impedance data points recorded on the graph grid marks 4 ANSI 10 50 knee point voltage and excitation current This is the same as the IEC 60044 1 10 50 knee point voltage 5 IEEE 30 knee point voltage and excitation current 6 IEEE 45 knee point voltage and excitation current 7 CT nameplate turns ratio 8 Measured turns ratio 9 Turns ratio percentage error calculation 10 Polarity of the CT 11 Measured phase angle 12 Excitation voltage used in CT turns ratio test 13 Excitation current in turns ratio test mi lt gt Semele UE 0 1 10 Figure 7 Typical EZCT Excitation Graph 200 RTS CT PLOT ASA 107 50 KNEE MARKER lt REV4 EZCT EZCT 10 USER S MANUAL 3 2 3 Performing a Turns Ratio Only Test The EZCT performs the CT turns ratio test using the voltage method Also if the name plate ratio is entered the EZCT will calculate the percentage error by comparing the CT measured ratio against the name plate ratio The percentage error is calculated as follows Error Measured Ratio Name Plate Ratio 100 Name Plate Ratio To perform a turns ratio only test a Start from the START UP menu 1 RUN TEST 08 27 09 SETUP 10 10 05 3 DIAGNOSTIC Press the 1 key RUN TEST b The following screen will be displayed
12. 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 TL POSITION ENTER TO ACCEPT Enter any relevant comments using the alpha numeric keypad and then press the ENTER key The following screen will be displayed OPERATOR TO POSITION ENTER 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 EZCT 10 USER S MANUAL REV 4 3 2 2 Performing an Excitation and Ratio Test When performing an excitation test the EZCT applies an AC voltage to the CT secondary winding The user raises this AC voltage until the CT windings reach the saturation point The user then slowly lowers the test voltage back to zero volts The voltage and current readings will be recorded to plot the excitation curve A typical excitation test contains a maximum of 32 data points There may be less than 32 data points depending on how quickly the voltage is lowered to zero or due to the CT excitation curve characteristics The EZCT also calculates the knee point voltages using IEEE 45 IEEE 30 ANSI 10 50 IEC 60044 1 10 50 standards and prints them on the tabulated report The CT turns ratio is measured using the voltage method An AC voltage is applied to the CT secondary winding The induce
13. V readings will be erratic No H cable connection No excitation voltage cables problem Transformer windings opposite side of CT windings is not shorted Suggested Solution e Check CT shorting screws e Check X lead connections e Check the CT terminal connection e Turn the voltage control knob back to zero and select a different test voltage using the test voltage selector switch e Remove X cables from the EZCT and the CT terminals e Check cable integrity using an Ohm Meter e Check the H cable connection e Turn on the X voltage e Check the Vy cable connection e Check the Vy cable integrity with an Ohmmeter e See Figure 4 EZCT EZCT 10 USER S MANUAL REV 4 6 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 V2 REV4 EZCT EZCT 10 USER S MANUAL 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 a
14. as follows 1200 5A X1 X5 1000 5A X2 X5 Ratio 1 5 240 Ratio 2 5 200 LIUM Calculated Ratio 1 20 EZCT EZCT 10 USER S MANUAL REV 4 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 V X1 X5 _ 1200 _ 12 V X2 X5 1000 1207 2 12 V X2 X5 V x2 x5 100V H1 v42120V V2 100V H2 Figure 24 This method also eliminates the effect of the auto transformer or reactor windings REV4 EZCT EZCT 10 USER S MANUAL L ALSTOM SHUNT REACTOR SERIAL NUMBER INSTRUCTION BOOK 111 583 STO NN PHASE 3 STANDARD COOLING TYPE FREQUENCY Hz INSULATING LIQUID NAPHTHENIC ASTM D 3487 88 MINERAL OIL CONTAINS NO PCB YEAR IMPEDANCE PER PHASE AT AND 75 23732 OHMS CORF TYPE DESIGN SOUND LEVEL amp SOMvar lt 806 WINDING CONDUCTOR COPPER RATED VOLTAGE kV TEMPERATURES CORE AND COILS MASS 70768 Jib 32100 kg 345 MAXIMUM AMBIENT TEMPERATURE 40 45 AMBIENT TEMPERATURE OlL MASS 38821 22780 kg TOP Gil RISE WINDING AVERAGE RISE RATED POWER MVA _ CEA OIL VOLUME CEE gai
15. gt FEAT LO ico Ir PERCENT ERROR lt LG FHAS E E C DE G lt T AT I Carr w T Ca lt gt OL T Figure 10 Typical Abbreviated Test Record Printout EZCT EZCT 10 USER S MANUAL REV4 3 3 3 Printing a Restored Test Record If you restored a test record see section 3 3 2 but did not print it at the time that it was restored you can still print it at a later time To print the test record in the working memory a Start from the START UP menu 1 RUN TEST 08 27 05 SETUP 10 10 25 3 DIAGNOSTIC Press the 2 key SETUP b The following screen will be displayed RECORD ID PRINT RECORD RESTORE RECORD NEXT PAGE Press the 2 key PRINT RECORD c The following screen will be displayed PRINT OPTIONS l FULL DATA ABBREVIATED DATA Press the 1 key FULL DATA to print all of the test record s data see Figure 6 The test record will be printed and you will be returned to the START UP menu Press the 2 key ABBREVIATED DATA to print an abbreviated version of the test record s data see Figure 10 The abbreviated version will not list the CT and Interpolated Data Points The test record will be printed and you will be returned to the START UP menu REV4 EZCT EZCT 10 USER S MANUAL 3 3 4 Erasing Test Records From the Flash EEPROM You can erase individu
16. pressing a key the corresponding number on the key will be displayed first Pressing the key again will display the first letter on the key Pressing the key again will display the second letter on the key For example to type the letter A you must press the 2 key twice To erase the character at the cursor position press the CLEAR key Press the PAPER Contrast key to move to the next character Press the PAPER l EZCT EZCT 10 USER S MANUAL REV4 v Contrast key to move to the previous character Press the ENTER key when you are done typing the company name The following screen will be displayed STATION TO POSITION ENTER TO ACCEPT Type the station name using the alpha numeric keypad and then press the ENTER key The following screen will be displayed CIRCUIT TO POSITION ENTER TO ACCEPT Type the circuit information using the alpha numeric keypad and then press the ENTER key The following screen will be displayed MANUFACTURER TO POSITION ENTER TO ACCEPT Type the manufacturer name using the alpha numeric keypad and then press the ENTER key The following screen will be displayed MODEL TO POSITION ENTER TO ACCEPT Type the model information using the alpha numeric keypad and then press the ENTER key REV4 EZCT EZCT 10 USER S MANUAL The following screen will be displayed SERIAL NUMBER TL POSITION
17. the substation ground before connecting any test cables The EZCT is supplied with a 20 foot X test cable and a 35 foot H cable Only the X cable connection is required to run the transformer excitation test The H and X cable connection is required to run the transformer ratio test A typical connection is shown in Figure 2 lt lt optional ground V N ASTI CURRENT TRANSFORMER TESTER WY Vanguard Instruments Co Inc Ontario California USA Figure 2 Typical EZCT Cable Connection REV4 EZCT EZCT 10 USER S MANUAL O nf qe nmm nm TYP 3 PLACES TYP 3 PLACES H1 EZCT X1 amp X2 NOTES EZCT 1 JUMPER INSTALLATION ON PRIMARY WINDING 1 amp 2 EZCT X1 amp X2 EZCT A PHASE BUSHING CT H1 EZCT C PHASE H1 BUSHING CT EZCT 041122ATRT02 X3 Figure 3 Connection to CT s on Y Transformer NOTE 1 JUMPER INSTALLATION ON SECONDARY WINDING H1 JUMPER EZCT CABLES TYP 3 PLACES H2 X1 amp X2 EZCT B PHASE BUSHING CT i A PHASE BUSHING CT gt 1 1 amp X2 1 amp 2 EZCT 041122 01 Figure 4 Connection to CT s a Delta Transformer EINEN ff EZCT EZCT 10 USER S MANUAL REV 4 H2 Hi 1x PHASE i BCT 1 ES i 1X2 ou H2 H1 Co ie 2x B PHASE i 2 i 3 1 2 2 seus pa H2 A PHASE A PHASE C P
18. 23836 i TANK AND FITTINGS MASS 41006 ip 18600 SHUNT REACTOR TERMINALS LIME HI H2 M3 MEUTRAL H RATED VOLTAGE v RATED CURRENT 380 se O SHIPPING WITHOUT Oi Mass 1807511 45700 kg COMPLETE REACTOR MASS 160695 Jib 72890 Jkg ramo TERMINAL 5000 5 4000 54 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 CNPJ 05 356 949 0008 08 MADE IN BRAZIL Figure 25 1 mA gt peste 2 0 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 2014 by Vanguard Instruments Company Inc EZCT and EZCT 10 User s Manual e Revision 4 7 June 4 2014 e TA
19. 3 Select the 50V range and limit the voltage to 10V 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 EZCI CURRENT TRANSFORMER TESTER Vanguard Instruments Co Inc Ontario California USA Figure 17 EZCT Turns Ratio Verification Test Connections REV4 EZCT EZCT 10 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 test 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 X cables are driving a short circuit The EZCT X cable is driving an opened circuit The test voltage selection switch is not set properly You can quickly verify if the CT was demagnetized by looking at the last excitation graph The EZCT 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
20. 621 8386 1 126 1 339 1 676 2 043 56 4 100 2 1221 6 135 3 142 4 146 3 148 9 2 3542 2 152 7 154 3 155 35 156 LEF 158 2 1585 159 53 160 1 iso 1621 23 e58 7 14 5 1 s91 9 462 7 564 1 313 9 253 0 208 179 1 141 4 115 6 78 8 INTERPOLATED DATA POINTS CUR CADI 10 2 O O40 5 O LOO o 200 o 400 BOO 1 000 2 DOO CN z e e 54 8 75 0 1 25 35 157 6 150 4 155 2 156 3 158 4 159 1 1621 23 YTG 5 gt S60 1045 0 4370 O 1500 O 1566 3 57 52 388 0 312 6 198 0 159 1 128 9 VOLTS AMPS ASA 10 50 ASA 10 2350 Ikp 126 7 VOLTS o 078 AMPS Teese 300 30 109 5 VOLTS 050 056 AMPS IEEE c mE 45 45 Ikp Zoo 00O 199 94 X IN PHASE 5 DEG 11 38 VOLTS O O011 AMPS NAMEPLATE RATIO MEASURED RATIO PERCENT ERROR POLARITY PHASE ANGLE EXCITATION EXCITATION CUR Figure 14 Tabulated Report Printout with Impedance Values 5 7 h J EZCT EZCT 10 USER S MANUAL REV 4 5 0 DIAGNOSTICS VERIFICATION AND TROUBLESHOOTING 5 1 Performing a Diagnostics Test The Diagnostics test mode displays the excitation voltage V the voltage sensed by the H leads Vi and the X voltage excitation current lx These val
21. EST DIRECTOR RECORD 5 ODAT E T I ME gt DDA FJ LI DIF TESTS STAT L CIRCUIT mero E MODEL 2 Seni C CE3SFTFAEEFT S RECORDO Numer A OAT gt T I ME oS oS de TEST S STAT I OMN L Aa CIRCUIT raAr re MODEL E Ses C Or3rE nrT RECORDO NUMBER gt ODAT T I ME ci gt OF TESTS AL STATION L CIRCUIT mere MODEL EZCT SS COMMENTS RECORD MHO M E F OAT T IL ME on LL ac ILUA de TEST STAT I OMN CIRCUIT mere MODEL F EF EE T I lt gt lt oF TESTS 2 STAT tori CIECLIIT MHP MODEL COMmmeriTtsei Figure 9 Sample Test Record Directory Printout REV4 EZCT EZCT 10 USER S MANUAL 3 3 2 Restoring and Printing a Test Record From Flash EEPROM You can restore a test record from the EZCT 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 1 RUN TEST 08 27 09 SETUP 10 10 25 3 DIAGNOSTIC Press the 2 key SETUP b The following screen will be displayed
22. GLE MEASUREMENT DISPLAY PRINTER COMPUTER INTERFACES PC SOFTWARE INTERNAL TEST RECORD STORAGE INTERNAL TEST HEADER STORAGE SAFETY ENVIRONMENT CABLES OPTIONS 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 or 200 240 Vac factory pre set 50 60 Hz ANSI IEEE C57 12 90 IEC 60044 1 and ANSI IEEE C57 13 1 0 50 Vac 2A max 0 200 Vac 2A max 0 1200 Vac 1 5A max 5 min on 10 min off 0 1 250 Vac Accuracy 1 0 of reading 0 5 volt 0 10A Accuracy 1 0 of reading 0 01A 0 8 99 0 5 100 999 1 0 1 000 5 000 2 0 360 degrees Accuracy 1 0 degree Back lit LCD Screen 20 characters by 4 lines viewable in bright sunlight and low light levels Built in 4 5 inch wide thermal printer One RS 232C port One USB port Windows XP Vista based software is included with purchase price Stores 128 test records Each test record may contain up to 10 excitation and ratio data sets Stores 10 test header records Designed to meet UL 61010A 1 and CAN CSA C22 2 No 1010 1 92 standards Operating 10 to 50 C 15 F to 122 Storage 30 C to 70 C 22 F to 158 F One 20 foot X cable set One 35 foot H cable set power cord One ground cable One cable carrying duffel bag Transportation case One year on parts and labor REV4 EZCT EZCT 10 USER S MANUAL
23. HASE C PHASE BCT 1 BCT 2 BCT 2 1 1 7222 04 t n pl 4 H1 9 H2 H2 1 je H1 H2 19 H1 PE d Mi b J hc adm mid Lj H Lj incu e e 1X1 1X2 2X1 2X2 2X2 2X1 1X2 1X1 H1 LJ LJ LJ H2 EZCT 1 5 fol EZCT NOTE e SHORT CT WINDINGS NOT UNDER TEST EZCT o 0606178622 Figure 5 Typical EZCT Connection to Multiple CT s REV4 EZCT EZCT 10 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 1 RUN TEST 08 25 05 SETUP 11 11 15 3 DIAGNOSTIC Press the 2 key SETUP b The following screen will be displayed RECORD ID PRINT RECORD RESTORE RECORD NEXT PAGE Press the 1 key RECORD ID c The following screen will be displayed 1 ENTER SHOT ID c LOAD ID FROM MEM 3 SHOT ID DIRECTORY Press the 1 key ENTER SHOT ID d The following screen will be displayed COMPANY TO POSITION ENTER TO ACCEPT Type the company name using the alpha numeric keypad When
24. L e The following screen will be displayed f g h PRINT TEST RESULTS l YES NO Press the 1 key YES to print the test results on the built in thermal printer The following screen will be displayed while the report is being printed PRINTING REPORT PLEASE WAIT A typical turns ratio only test report printout is shown in Figure 8 The following screen will be displayed when printing is finished CERRI YES NO Press the 1 key YES to keep the test The following screen will be displayed TEST SAVED Press the ENTER key to continue The following screen will be displayed RUN ANOTHER TEST 1 YES 2 NO Press the 2 key NO EZCT EZCT 10 USER S MANUAL REV 4 i The following screen will be displayed Press the 1 key YES to save the test record The following screen will be displayed j The following screen will be displayed Press the ENTER key The following screen will be displayed Turn the VOLTAGE CONTROL knob counter clockwise to the zero point you will hear a click and will be unable to turn it anymore and you will be returned to the START UP menu CT EXCITATION TEST RESULTS DATE 98 27 09 TIME 14 27 25 Come ANM 5 N G Le FL STAT I ON L rE3 CIRCUIT MEF z aci MODEL Se dass C COFaArdAE rmr OPERATOR TA RATIO OAT A FAdexr1E F L 1TE RATIO
25. Press the 2 key BURIED CT IN DELTA The following screen will be displayed L BURIED CT DLTA ON c BURIED CT DLTA OFF Press the 1 key BURIED CT DLTA ON EOM EZCT EZCT 10 USER S MANUAL REV4 f Thefollowing screen will be displayed RATION ADJ BY 2 3 ARE YOU SURE YES NO Press the 1 key YES g The following screen will be displayed BURIED CT IN DELTA RATION ADJUSTED BY TWO THIRDS Press any key to return to the START UP menu 4 2 2 Disabling the Buried CT in Transformer Delta Option To disable the Buried CT in Transformer Delta option a Start from the START UP menu 1 RUN TEST 08 27 05 SETUP 10 10 25 3 DIAGNOSTIC Press the 2 key SETUP b The following screen will be displayed RECORD ID PRINT RECORD RESTORE RECORD NEXT PAGE Press the 4 key NEXT PAGE c The following screen will be displayed 1 SET 7 PRINT ON OFF BURIED CT IN DELTA Press the 2 key BURIED CT IN DELTA SA REV4 EZCT EZCT 10 USER S MANUAL d The following screen will be displayed Press the 2 key BURIED CT DLTA OFF The following screen will be displayed Press any key to return to the START UP menu EZCT EZCT 10 USER S MANUAL REV 4 Vh 081121EZCT2kV667D Figure 12 Buried CT in a Delta Transformer Illustration 1 081121EZCT2kV667E Figure 13 Buried CT in a Delta Transformer Illust
26. USER S MANUAL Vanguard Instruments Company Inc 1520 S Hellman Ave Ontario California 91761 USA EL 909 923 9390 June 2014 Revision 4 7 EZCT EZCT 10 USER S MANUAL REV4 SAFETY SUMMARY This manual applies to the EZCT and EZCT 10 Current Transformer Testers The operating procedures are virtually the same for both models and any differences in operation are clearly described in 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 EZCT EZCT 10 or cause errors in the test results Vanguard Instruments Company Inc assumes no liability for unsafe or improper use of the EZCT EZCT 10 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 EZCT 10 can produce a voltage up to 1 200 Vac that can cause severe injury and or equipment damage Due to this reason the EZCT EZCT 10 shall be used only by trained operators The EZCT EZCT 10 s X output terminals are rated to 1 200 Vac working voltage Any voltage above 1 200 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 shal
27. al or all test records stored in the EZCT s Flash EEPROM To erase a test record a Start from the START UP menu l RUN TEST 08 27 09 SETUP 10 10 25 3 DIAGNOSTIC Press the 2 key SETUP b The following screen will be displayed 1 RECORD ID PRINT RECORD 3 RESTORE RECORD 4 NEXT PAGE Press the 3 key RESTORE RECORD c The following screen will be displayed 1 RESTORE RECORD RECORD DIRECTORY 3 ERASE RECORDS Press the 3 key ERASE RECORDS d The following screen will be displayed ERASE RECORD 1 ERASE SINGLE REC ERASE ALL RECORDS 1 ERASE SINGLE REC Press the 1 key ERASE SINGLE REC if you would like to erase a single test record The following screen will be displayed ERASE RECORD NUMBER Type the record number that you would like to erase and then press the ENTER key If you do not know the record number you can first print a test record directory for reference see section 3 3 1 c EZCT EZCT 10 USER S MANUAL REV4 ES The following screen will be displayed while the record is being erased ERASING RECORD NUMBER 3 PLEASE WAIT The following screen will be displayed when the record has been completely erased RECORD NUMBER 3 ERASED Press the ENTER key to return to the START UP menu ERASE ALL RECORDS Press the 2 key ERASE ALL RECORDS if you would like to erase all the test records stored in the u
28. d to the START UP menu A graphic report showing the knee point marker is shown in Figure 11 EZCT EZCT 10 USER S MANUAL REV 4 LIE Ri IL I Knee Point Marker LL SIE SZ ES SS DEO xy RA FH LI E Ei lt gt bs CT EXCITATION PLOT ASA 107 50 KNEE MARKER aes we TITTI A A DE DU 10 E Knee Point Marker Type Figure 11 Graphic Report Showing Knee Point Marker REV4 EZCT EZCT 10 USER S MANUAL 4 2 Selecting 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 select the Buried CT in Delta option from the SETUP menu using the steps below Start from the START UP menu 1 RUN TEST 08 27 09 SETUP 10 10 05 3 DIAGNOSTIC Press the 2 key SETUP The following screen will be displayed RECORD ID PRINT RECORD RESTORE RECORD NEXT PAGE Press the 4 key NEXT PAGE The following screen will be displayed COMPUTER CONTROL SET TIME KNEE POINT MARKER NEXT PAGE Press the 4 key NEXT PAGE The following screen will be displayed 1 SET 7 PRINT ON OFF BURIED CT IN DELTA
29. d voltage on the CT primary winding is them measured The CT turns ratio is the voltage ratio measured between the secondary and the primary windings Follow the steps below to perform an excitation and ratio test a When the EZCT 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 Press the 1 key RUN TEST to start a test b The following screen will be displayed Press the 1 key EXCITATION amp RATIO A REV4 EZCT EZCT 10 USER S MANUAL C e f The following screen will be displayed Turn the TEST VOLTAGE selector knob to select the desired test voltage range 50V 200V or 1200V Press the START key to continue The following screen will be displayed Turn the VOLTAGE CONTROL knob clockwise until the test current displayed is about 2 0A 10 0A for the EZCT 10 As you turn the knob the screen will be updated as shown Once the CT has been saturated the EZCT will beep rapidly Press the ENTER key The following screen will be displayed Slowly turn the VOLTAGE CONTROL knob counter clockwise to lower the current all the way down to zero The following screen will be displayed Press the 1 key YES EZCT EZCT 10 USER S MANUAL REV4 g The following screen will be displayed XFMR NAME PLATE RAT 1 YES NO 1 YES Press the 1 key
30. e following screen will be displayed RECORD RESTORED PRINT RECORD l YES NO 1 YES Press the 1 key YES if you would like the print the restored test record The following screen will be displayed PRINT OPTIONS l FULL DATA ABBREVIATED DATA Press the 1 key FULL DATA to print all of the test record s data see Figure 6 The test record will be printed and you will be returned to the START UP menu Press the 2 key ABBREVIATED DATA to print an abbreviated version of the test record s data see Figure 10 The abbreviated version will not list the CT REV4 EZCT EZCT 10 USER S MANUAL and Interpolated Data Points The test record will be printed and you will be returned to the START UP menu NO Press the 2 key NO if you do not want to print the test record at this time You will be returned to the START UP menu You can print the restored test record at a later time if you prefer see section 3 3 3 REC NUMBER CT EXCITATION TEST RESULTS COMPANY WANGU ARO CIRCUIT rir r MODEL ECT E lt OPERATOR TA TEST NUMBER i VOLTA lt AMPS IL O gt Nr EL p n d Ec x VOLT XL aoe MVE nm al VOLT 156 AMPS IEEE 45 Tea oo ET EC O O MIE A S aU AE
31. ed 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 REV4 EZCT EZCT 10 USER S MANUAL 2 5 Replacing the Thermal Printer Paper The roll of thermal paper is housed inside a dispenser underneath the printer cover To replace the paper follow the steps below e Unscrew the two large printer cover screws and remove the printer cover e Remove the leftover thermal paper roll from the paper holder e Unroll the new thermal paper roll e Feed the thermal paper into the slot between the paper pocket and the rubber roller The printer will automatically pull the paper under the thermal head e Place the paper roll into the paper holder e Lift the thermal head and align the thermal paper if necessary e Re install the printer cover 2 6 Computer Interface Ports The EZCT features one USB and one RS 232C PC interface port A Windows based Current Transformer Analysis software application is supplied with the EZCT For further information please see the software user s manual EZCT EZCT 10 USER S MANUAL REV4 3 0 OPERATING PROCEDURES 3 1 EZCT Cable Connections Always connect the EZCT to
32. er Delta 38 3 55 eise e 42 4 4 Setting the Option to Print Impedance Z in the Tabulated Results 43 5 0 DIAGNOSTICS VERIFICATION AND TROUBLESHOOTING eene 46 5 1 Performing a Diagnostics tria 46 5 2 Verifying the EZCT s V Sense Circuit Using an External 48 5 3 Verifying the EZCT s I Sense Circuit Using an External Meter 49 5 4 Quickly Verifying the EZCT s Turns Ratio CIFCUIt 1 50 bo 51 6 0 Appendix A Calculating Turns Ratio on a Shunt 52 i ON EZCT EZCT 10 USER S MANUAL REV4 LIST OF TABLES Table 1 EZET Technical Specifications io 4 Table 2 EZCT 10 Table 3 Functional Descriptions of EZCT EZCT 10 Controls and Indicators 7 Table 4 Descriptions of Tabulated Test Results 22 LIST OF FIGURES Figure 1 EZCT EZCT 10 Controls and Indicators 00 01 eene 6 Figure 2 Typical EZCT Cable 9 10 Figure 3 Connection to CT Son Y TransrOF Tief i
33. ii 11 Figure 4 Connection to CT s on a Delta Transformer i 11 Figure 5 Typical EZCT Connection to Multiple 5 12 Figure 6 Typical EZCT Tabulated Report Printout 21 Figure 7 Typical EZCT Excitation 22 Figure 8 Typical Turns Ratio Only Test Report Printout eene 26 Figure 9 Sample Test Record Directory PrintoUut 28 Figure 10 Typical Abbreviated Test Record Printout 31 Figure 11 Graphic Report Showing Knee Point 36 Figure 12 Buried CT in a Delta Transformer Illustration 1 eese 40 Figure 13 Buried CT in a Delta Transformer Illustration 2 40 Figure 14 Tabulated Report Printout with Impedance 45 Figure 15 EZCT V Verification Test CONNECtIONS nennen nnne nns 48 Figure 16 EZCT I Verification Test 5 04 nnne nnn nnns 49 Figure 17 EZCT Turns Ratio Verification Test COnNNECtIONS nene 50 c tes 52 ga O e 53 PV c O OO r 2 54
34. in both bright sunlight and low light levels A rugged alpha numeric membrane keypad is used to enter test information and to control the unit s functions The test voltage range 50V at 2A 200V at 2A 1 200V at 1 5A is selected with a switch on the control panel A voltage control knob is used to control the variable test voltage output Thermal Printer A built in 4 5 inch wide thermal printer can print the current transformer test report and plot the excitation curves REV4 EZCT EZCT 10 USER S MANUAL Computer Interface The EZCT can be used as a stand alone unit or can be computer controlled via the built in RS 232C or USB interfaces Windows XP Vista based Current Transformer Analysis software is provided with each EZCT This software can be used to retrieve test records from the EZCT 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 comes furnished with the following e One Power Cord e One Ground Cable e One 20 foot X Cable Set e One 35 foot H Cable Set e One cable carrying duffel bag EZCT EZCT 10 USER S MANUAL REV 4 1 3 1 3 1 Technical Specifications EZCT Technical Specifications Table 1 EZCT Technical Specifications TYPE PHYSICAL SPECIFICATIONS INPUT POWER MEASUREMENT METHOD OUTPUT TEST OUTPUT VOLTAGES VOLTAGE READING RANGE CURRENT READING RANGE CURRENT RATIO RANGE PHASE AN
35. inst the value displayed on the external volt meter e Press the STOP key to end the test X2 Do D 2 Vanguard Instruments Co Inc Ontario California USA Figure 15 EZCT V Verification Test Connections REV4 EZCT EZCT 10 USER S MANUAL 5 3 Verifying the EZCT s I Sense Circuit Using an External Meter You can verify the excitation current 1 sensed by the EZCT by using an external RMS ampere meter Follow the steps below to verify the EZCT 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 s Diagnostics mode see section 5 1 c Turn the Voltage Control knob clockwise to raise the V voltage d Verify the I voltage displayed on the EZCT s LCD screen against the value displayed on the external RMS ampere meter e Press the STOP key to end the test POWER RESISTOR AMPERE METER X2 VOLTAGE CONTROL A gt Vanguard Instruments Co Inc Ontario California USA Figure 16 EZCT I Verification Test Connections EZCT EZCT 10 USER S MANUAL REV4 5 4 Quickly Verifying the EZCT s Turns Ratio Circuit You can quickly verify the EZCT 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
36. l be isolated before conducting any test with the EZCT EZCT 10 Always ground the EZCT EZCT 10 to a substation ground before connecting 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 EZCT 10 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 REV4 EZCT EZCT 10 USER S MANUAL TABLE OF CONTENTS CONVENTIONS USED IN THIS DOCUMENT 1 LO INTRODUCTION nn eni 2 1 1 General Description and 2 1 2 PurhishedACCOSSDFIOS A Sposa US Bod 3 L3 Technical serieren edite ria a ra 4 1 294 Technical Specifications eiue seb ro UR 4 1 3 2 EZCEIOTEENAICAISPECifications ninnen 5 Controli and Ande St 6 20 PRES ES I
37. liminated and will create an error in the CT turns ratio measurement The amount of error depends on the amount of turns of the secondary windings The alternative method to verify the CT turns ratio is shown in Figure 23 and Figure 24 EZCT EZCT 10 USER S MANUAL REV4 Figure 22 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 22 Since there is no secondary winding on the shunt reactor the V3 voltage cannot be eliminated from the connection 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 alternative method to verify the CT turns ratio is shown in Figure 23 and Figure 24 REV4 EZCT EZCT 10 USER S MANUAL Figure 23 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 eliminated The turns ratio X1 X5 X2 X5 measured by the EZCT or any electronic TTR will be as follows V1 Ratio V2 H1 H2 Figure 23 From the name plate of the CT show in table below the turns ration can be calculated
38. n 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 measured will be wrong EZCT EZCT 10 USER S MANUAL REV 4 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 Jumper H2 X2 Figure 20 REV4 EZCT EZCT 10 USER S MANUAL Figure 21 shows a CT mounted on an auto transformer This configuration is very similar to the CT mounted on a single phase transformer the main difference being that the secondary winding is part of the primary winding The turns ratio in this case will be V1 V1 Ratlo V24V3 V2 S V1 V4 1 X1 Jumper 0 0 Figure 21 By shorting out the transformer s secondary winding X1 to 0 0 we can eliminate the voltage induced from X1 to HO XO The voltage cannot be e
39. nit s Flash EEPROM The following screen will be displayed ERASE ALL RECORDS Are you SURE ENTER TO CONTINUE Press the ENTER key if you are absolutely sure that you would like to erase all the stored test records The following screen will be displayed while the records are being erased ERASING RECORDS PLEASE WAIT The following screen will be displayed after all the stored records have been completely erased RECORDS ERASED Press the ENTER key to return to the START UP menu REV4 EZCT EZCT 10 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 1 RUN TEST 08 27 05 SETUP 10 10 25 3 DIAGNOSTIC Press the 2 key SETUP b The following screen will be displayed RECORD ID PRINT RECORD RESTORE RECORD NEXT PAGE Press the 4 key NEXT PAGE c The following screen will be displayed 1 COMPUTER CONTROL eS eee ile 3 KNEE POINT MARKER 4 NEXT PAGE Press the 3 key KNEE POINT MARKER d The following screen will be displayed 1 IEEE 30 DEGREE IEEE 45 DEGREE 3 ASA 0 gt SOZI Select the desired knee point marker by pressing the corresponding key 1 for IEEE 30 DEGREE 2 for IEEE 45 DEGREE or 3 for ASA 100 V 5041 The knee point marker will be set and you will be returne
40. o 122 Storage 30 C to 70 C 22 F to 158 F One 20 foot X cable set One 35 foot H cable set power cord One ground cable One cable carrying duffel bag Transportation case One year on parts and labor EZCT EZCT 10 USER S MANUAL REV 4 1 4 Controls and Indicators The EZCT and EZCT 10 feature the same controls and indicators shown in Figure 1 A leader line with an index number points to each control and indicator which is cross referenced to a functional description in Table 3 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 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 EZCT CURRENT TRANSFORMER TESTER D Vanguard Instruments Co Inc Ontario California USA Figure 1 EZCT EZCT 10 Controls and Indicators REV4 EZCT EZCT 10 USER S MANUAL Item Number 1 A N ON O Vi 11 12 13 Table 3 Functional Descriptions of EZCT EZCT 10 Controls and Indicators Panel Markings X H SOV 200V 1200V HIGH VOLTAGE PRESENT 120 Vac 12A 50 60Hz None GROUND USB PC RS 232C VOLTAGE CONTROL None None None Functional Description Current transformer excitation voltage connector Current t
41. ransformer primary input test cable connector Test voltage selector switch LED warning indicator that is illuminated when high voltage is present Power switch with built in 20A circuit breaker AC receptacle Ground stud USB PC interface connector RS 232C PC interface connector Test voltage control knob Rugged alpha numeric membrane keypad Back lit LCD screen 20 characters by 4 lines viewable in bright sunlight and low light levels Built in 4 5 inch wide thermal printer EZCT EZCT 10 USER S MANUAL REV4 2 0 PRE TEST SETUP 2 1 Operating Voltages The EZCT 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 EZCT s built in thermal printer uses 4 5 inch wide thermal paper for printing test results To maintain the highest print quality and to avoid paper jams the use of thermal paper suppli
42. ration 2 REV4 EZCT EZCT 10 USER S MANUAL EZCT EZCT 10 USER S MANUAL REV4 4 3 Setting the Clock To set the EZCT s internal clock a Start from the START UP menu 1 RUN TEST 08 27 05 SETUP 10 10 25 3 DIAGNOSTIC Press the 2 key SETUP b The following screen will be displayed RECORD ID PRINT RECORD RESTORE RECORD NEXT PAGE Press the 4 key NEXT PAGE c The following screen will be displayed COMPUTER CONTROL SET TIME KNEE POINT MARKER NEXT PAGE Press the 2 key SET TIME d The following screen will be displayed ENTER MM DD YY HH MM SS 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 REV4 EZCT EZCT 10 USER S MANUAL 4 4 Setting the Option to Print Impedance Z in the Tabulated Results The EZCT can print the CT impedance Z values in the tabulated results see Figure 14 The impedance values are the quotient of the excitation voltage divided by the current reading at each data point To enable or disable the printing of the impedance values a Start from the START UP menu 1 RUN TEST 08 27 09 SETUP 10 10 25 3 DIAGNOSTIC Press the 2 key SETUP b The following screen will be displayed RECORD ID PRINT RECORD RESTORE RECORD NEXT PAGE
43. rs from the host equipment The EZCT is capable of outputting 50 Vac at 2A and 200 Vac at 2A The EZCT 10 has all the features of the EZCT but uses a heavy duty transformer to perform the CT excitation test It is capable of outputting 50 Vac at 10A and 200 Vac at 10A CT Excitation Test The CT excitation test is performed using the ANSI IEEE C57 13 1 IEC 60044 1 test method The EZCT applies an AC variable test voltage up to 1 200 Vac to the CT s secondary windings The EZCT records and displays the test voltage and excitation current applied to the current transformer during the excitation test Once tests are completed up to 10 excitation curves and knee point voltages of the tests can be plotted on the built in thermal printer IEEE 30 IEEE 45 ANSI IEC 60044 1 10 50 knee point voltages are also calculated and printed on the test report CT Ratio and Polarity Tests The EZCT determines the CT current ratio using the ANSI IEEE C57 12 90 measurement method A test voltage is applied on the CT s X terminals and the induced voltage is measured across the CT s H1 and H2 terminals The current ratio is displayed on the screen and stored in memory The current ratio measuring range is from 0 8 to 5 000 Winding polarity is displayed as a sign in phase or sign out of phase and is annotated with the phase angle in degrees User Interface The EZCT features a back lit LCD screen 4 lines by 20 characters that is viewable
44. ues can then be verified using an external volt meter and ampere meter To perform a diagnostic test a Start from the START UP menu l RUN TEST 08 27 09 SETUP 10 10 25 3 DIAGNOSTIC Press the 3 key DIAGNOSTIC b The following screen will be displayed CAUTION CABLES WILL BE ENERGIZED ENTER TO CONTINUE Press the ENTER key to continue c The following screen will be displayed DIAGNOSTIC Vx 0 0 Ix 0 0000 Vh 0 000 STOP TO EXIT Turn the VOLTAGE CONTROL knob clockwise to raise the Vx voltage d The screen will be updated as the Vx voltage is raised DIAGNOSTIC 8 7 0 0050 Vh 0 010 ATO EXIT Press the STOP key 20 REV4 EZCT EZCT 10 USER S MANUAL e The following screen will be displayed Turn the VOLTAGE CONTROL knob counter clockwise back to zero You will then be returned to the START UP menu EZCT EZCT 10 USER S MANUAL REV4 5 2 Verifying the EZCT s V Sense Circuit Using an External Meter The excitation voltage Vx sensed by the EZCT can be verified using an external RMS volt meter Follow the steps below to verify the EZCT s V sense circuit a Connect the X cables to an RMS volt meter as shown in Figure 15 b Select the EZCT s Diagnostics mode see section 5 1 c Turn the Voltage Control knob clockwise to raise the V voltage d Verify the V voltage displayed on the EZCT LCD screen aga
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