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REV 3

 

EZCT-2000 USER’S MANUAL

 

 

9

 

 

 

 

3.0 OPERATING 

PROCEDURES 

3.1 

EZCT-2000 Cable Connections 

Always connect the EZCT-2000 to the substation ground before connecting any test cables. The 
EZCT-2000 is supplied with five 20-foot X test cables and one 35-foot H cable. 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. 

 

Figure 2. Typical EZCT-2000 Excitation and Ratio Test Cable Connection 

Содержание EZCT-2000

Страница 1: ...EZCT 2000TM DIGITAL CURRENT TRANSFORMER TESTER USER S MANUAL Vanguard Instruments Company Inc 1520 S Hellman Ave Ontario California 91761 USA TEL 909 923 9390 FAX 909 923 9391 October 2009 Revision 3 ...

Страница 2: ...ge the input circuitry Please see section 3 2 for further information 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 any test with the EZCT 2000 Always ground the EZCT 2000 to a substation ground before connecting the test cables to a transfo...

Страница 3: ...cords Stored in the EZCT 2000 s Memory 28 3 4 4 Erasing Test Records From the Flash EEPROM 30 3 5 Working With Test Plans 32 3 5 1 Extracting the Test Plan From a Test Record 32 3 5 2 Printing a Directory of Test Plans Stored in the EZCT 2000 s Memory 34 3 5 3 Printing a Test Plan 36 3 5 4 Erasing Test Plans From the Flash EEPROM 38 3 5 5 Loading a Test Plan from the EZCT 2000 s Flash EEPROM 40 3 ...

Страница 4: ...ample CT Name Plate 11 Figure 6 Typical EZCT 2000 Tabulated Report Printout 21 Figure 7 Typical EZCT 2000 Graphic Report 23 Figure 8 Typical EZCT 2000 Graphic Report with Multiple Plot Curves 23 Figure 9 Typical Internal Test Record Directory Printout 29 Figure 10 Typical EZCT 2000 Flash EEPROM Test Plan Directory Printout 35 Figure 11 Typical Test Plan Printout 37 Figure 12 Graphic Report Showing...

Страница 5: ...nced as SCREEN MENU NAME The terms test record and test shot are used interchangeably EZCT 2000 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 WARNING Warning message Important notes are indicated as NOTE Note details 1 OPTION 1 2 OPTION 2 3 OPTION 3 4 O...

Страница 6: ...nce all of the unit s test leads can be connected to all of the CT output terminals at the same time Up to 10 excitation tests can be stored in one record 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 Test The EZCT 2000 determines the CT current ratio using the ANSI IEEE C57 12 90 meas...

Страница 7: ... each of the tests Up to 10 test definitions can be stored per test plan The use of a test plan greatly simplifies the CT testing process the EZCT 2000 is connected to the CT terminals and a test plan is simply selected and run Test plans can be created on the EZCT 2000 itself or created on a PC and downloaded to the EZCT 2000 via the unit s built in RS 232C or USB interfaces Computer Interface Th...

Страница 8: ... count 10 μ ohms DISPLAY Back lit LCD Screen 20 characters by 4 lines viewable in bright sunlight and low light levels PRINTER Built in 4 5 inch wide thermal printer COMPUTER INTERFACES One RS 232C port 115k baud One USB port PC SOFTWARE Windows XP Vista based CT Analysis software is included with purchase price INTERNAL TEST RECORD STORAGE Stores 140 test records Each test record may contain up t...

Страница 9: ...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 2000 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 ...

Страница 10: ...the input circuitry 6 H Current transformer primary input test cable connector 7 GROUND Grounding stud 8 AC receptacle 9 Back lit graphic LCD screen 128 x 64 viewable in bright sunlight and low light levels 10 110 120 Vac 12A 50 60Hz Power switch with built in circuit breaker 11 Rugged alpha numeric membrane keypad 12 HIGH VOLTAGE PRESENT LED warning indicator that is illuminated when high voltage...

Страница 11: ...r 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 Contrast key 2 4 Printer Paper The EZCT 2000 s built in thermal printer uses 4 5 inch wide thermal paper for printing test results To maintain the highest print quality and to avoid paper jams the use of thermal paper supplied by Vanguard In...

Страница 12: ...r 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 NOTE Thermal paper has a chemical coating on one side of the paper This side should be facing the thermal print head Incorrect paper loading may result in blank output on the thermal paper The thermal paper will show a red stripe to indicat...

Страница 13: ...d one 35 foot H cable 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 Figure 2 Typical EZCT 2000 Exci...

Страница 14: ...EZCT 2000 USER S MANUAL REV 3 10 Figure 3 Bushing CT Connection on Delta Transformer Figure 4 Bushing CT Connection on Y Transformer ...

Страница 15: ...1 X2 is 400 to 1 The turns ratio between X1 X4 and X1 X2 is 7 88 3150 400 If a test voltage of 300 Vac is applied to the X1 X2 terminals a voltage of 2 364 Vac 300 Vac x 7 88 will be induced at the X1 X4 terminals If all the test leads are connected to the EZCT 2000 and the excitation test is performed on the X1 X2 terminals the voltage induced at the X1 X4 terminals will exceed 2 000 Vac as the v...

Страница 16: ...the 1 key RECORD ID c The following screen will be displayed 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 A you must press the 2 key twice To erase the ...

Страница 17: ... Type the manufacturer name using the alpha numeric keypad and then press the ENTER key g The following screen will be displayed Type the model information using the alpha numeric keypad and then press the ENTER key h The following screen will be displayed Type the serial number using the alpha numeric keypad and then press the ENTER key SERIAL NUMBER TO POSITION ENTER TO ACCEPT MODEL TO POSITION ...

Страница 18: ...eric keypad and then press the ENTER key j The following screen will be displayed Type the operator s name using the alpha numeric keypad and then press the ENTER key All header information will be saved and you will be returned to the START UP menu OPERATOR TO POSITION ENTER TO ACCEPT COMMENTS TO POSITION ENTER TO ACCEPT ...

Страница 19: ...test type by pressing the corresponding key 1 5 c The following screen will be displayed 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 If the selected test included an excitation test the following screen will be displayed Select a test voltage range by pressing the corresponding key 1 5 SELECT...

Страница 20: ...io 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 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 Type the second number using the keypad The screen will be updated as shown P...

Страница 21: ... the CLEAR key Press the PAPER Contrast button 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 note h The following screen will be displayed if the selected test included a resistance test Press the 1 key YES Selecting this option will print the current ratio error table as part of the tabulated test resu...

Страница 22: ...tart the test m If the selected test included a resistance test the following screen will be displayed momentarily The following screen will then be displayed NOTE The HIGH VOLTAGE PRESENT light will be illuminated to indicate that high voltage is present n If the selected test included a ratio test the following screen will be displayed momentarily CABLES ENERGIZED 1200V 1 0A X1 X2 RESISTANCE 215...

Страница 23: ...on the thermal printer A typical EZCT 2000 tabulated test report printout is shown in Figure 6 Typical graphic reports are shown in Figure 7 and Figure 8 Press the 2 key NO if you do not want to print the test results p The following screen will be displayed Press the 1 key YES to keep the test results KEEP THIS TEST 1 YES 2 NO PRINT TEST RESULTS 1 YES 2 NO ANY KEY TO CONTINUE Vx 79 5 Vh 0 3970 I ...

Страница 24: ... YES to save the record The following screen will be displayed momentarily t The following confirmation screen will then be displayed NOTE The test record number is automatically assigned to each test record stored in the EZCT 2000 s Flash EEPROM Press any key to return to the START UP menu RECORD NUMBER 1 HAS BEEN SAVED SAVING RECORD PLEASE WAIT SAVE THIS RECORD 1 YES 2 NO RUN ANOTHER TEST 1 YES ...

Страница 25: ...REV 3 EZCT 2000 USER S MANUAL 21 Figure 6 Typical EZCT 2000 Tabulated Report Printout ...

Страница 26: ...rded on the graph grid marks 8 Measured DC resistance value of CT under test 9 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 10 IEEE 30 knee point voltage and excitation current 11 IEEE 45 knee point voltage and excitation current 12 CT nameplate turns ratio 13 Measured turns ratio 14 Turns ratio per...

Страница 27: ...REV 3 EZCT 2000 USER S MANUAL 23 Figure 7 Typical EZCT 2000 Graphic Report Figure 8 Typical EZCT 2000 Graphic Report with Multiple Plot Curves Knee Point Marker ...

Страница 28: ...reen will be displayed Press the 3 key RESTORE RECORD c The following screen will be displayed 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 Type the record number using the alpha numeric keypad and then press the ENTER key The following screen will be displayed RECORD RESTORED PRINT RECORD 1 YES 2 NO RESTO...

Страница 29: ...on or the PAPER Contrast key to display the next or previous test record respectively The test record information will be displayed as shown When you have located the test record that you would like to restore press the ENTER key 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 ...

Страница 30: ...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 PRINT OPTIONS 1 FULL D...

Страница 31: ...isplayed Press any key to return to the START UP menu Please see section 3 4 1 for instructions on how to restore a test record Press the 1 key to print the tabulated data and 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...

Страница 32: ...rds stored in the EZCT 2000 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 9 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 2000 s Flash EEPROM The short directory li...

Страница 33: ...REV 3 EZCT 2000 USER S MANUAL 29 Figure 9 Typical Internal Test Record Directory Printout ...

Страница 34: ...ll be displayed Press the 2 key ERASE RECORD d The following screen will be displayed 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 Type the record number to be erased and press the ENTER key ERASE RECORD NUMBER ERASE RECORD 1 ERASE SINGLE REC 2 ERASE ALL RECORDS 1 RECORD DIRECTORY 2 ERASE RECORD 3 KNEE POINT M...

Страница 35: ...rds stored in the EZCT 2000 s flash EEPROM The following confirmation screen will be displayed 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 The following screen will be displa...

Страница 36: ...se 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 4 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 3 or restore a test record see section 3 4 1 that you would like to extract the test plan from b Start from the START UP me...

Страница 37: ...lease see section 3 4 1 e 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 2000 s Flash EEPROM as a new test plan The test plan number will be automatically incremented by the EZCT 2000 Press any key to return to the START UP menu TEST PLAN NUMBER 1 HAS BEEN SAVED NO RECORD LOADED ...

Страница 38: ...lowing screen will be displayed Press the 3 key PLAN DIRECTORY c The following screen will be displayed while the test plan directory is printed on the thermal printer 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 10 PRINTING DIRECTORY 1 LOAD TEST PLAN 2 UNLOAD TEST PLAN 3 PLAN...

Страница 39: ...REV 3 EZCT 2000 USER S MANUAL 35 Figure 10 Typical EZCT 2000 Flash EEPROM Test Plan Directory Printout ...

Страница 40: ...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 5 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 11 Test plan elements are described in Table 4 PRINT TEST PLAN NUMBER 1 EXTRACT TEST PLAN 2...

Страница 41: ... of Test Plan Elements Item Number Description 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 ...

Страница 42: ...3 key ERASE TEST PLAN d The following screen will be displayed 1 ERASE SINGLE PLAN Press the 1 key if you would like to erase a single test plan The following screen will be displayed Type the test plan number that you would like to erase and press the ENTER key ERASE TEST PLAN NUMBER ERASE TEST PLAN 1 ERASE SINGLE PLAN 2 ERASE ALL PLANS 1 EXTRACT TEST PLAN 2 PRINT TEST PLAN 3 ERASE TEST PLAN 1 LO...

Страница 43: ...o erase all test plans 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 The following screen will be displayed after all of the test p...

Страница 44: ...n will be displayed Press the 1 key LOAD TEST PLAN c The following screen will be displayed 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 5 2 d The following screen will be displayed Press any key to return to the START UP menu TEST PLAN LOADED LOAD TEST P...

Страница 45: ...N 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 Press the START key and the EZCT 2000 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 Press the 1...

Страница 46: ...splayed Use the alpha numeric keys on the keypad to enter a test note and press the ENTER key d The following confirmation screen will be displayed showing the test parameters Press the START key to begin the test e The EZCT 2000 will start performing the test per the test plan parameters When the test has finished the following screen will be displayed Press any key to continue ANY KEY TO CONTINU...

Страница 47: ... the test results h The following screen will be displayed Press any key to continue i The following screen will be displayed Press the 1 key YES to save the record 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 RECORD NUMBER 2 HAS BEEN SAVED SAVING RECORD PLEASE WAIT KEEP THIS RECORD 1 YES 2 ...

Страница 48: ...ters a Start from the START UP menu Press the 3 key TEST PLANS b The following screen will be displayed Press the 2 key UNLOAD TEST PLAN c The following screen will be displayed Press any key to return to the START UP menu TEST PLAN UNLOADED 1 LOAD TEST PLAN 2 UNLOAD TEST PLAN 3 PLAN DIRECTORY 4 NEXT PAGE 1 RUN TEST 09 24 09 2 SETUP 08 20 19 3 TEST PLANS 4 DIAGNOSTIC ...

Страница 49: ... MARKER d The following screen will be displayed Press either the 1 key IEEE 30 DEGREE the 2 key IEEE 45 DEGREE or the 3 key ASA 10 V 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 12 1 IEEE 30 DEGREE 2 IEEE 45 DEGREE 3 ASA 10 V 50 I 1 RECORD DIRECTORY 2 E...

Страница 50: ...EZCT 2000 USER S MANUAL REV 3 46 Figure 12 Graphic Report Showing Knee Point Marker Knee Point Marker Knee Point Marker Type ...

Страница 51: ...he Buried CT in Delta option a Start from the START UP menu Press the 2 key SETUP b The following screen will be displayed Press the 4 key NEXT PAGE c The following screen will be displayed Press the 4 key NEXT PAGE d The following screen will be displayed Press the 2 key BURIED CT IN DELTA e The following screen will be displayed Press any key to return to the START UP menu BURIED CT IN DELTA RAT...

Страница 52: ... Buried CT in Delta option will stay active for all subsequent tests performed Turning off the EZCT 2000 will reset this option Figure 13 Buried CT in a Delta Transformer Illustration 1 Figure 14 Buried CT in a Delta Transformer Illustration 2 ...

Страница 53: ...d through the H1 H2 terminals of the Delta winding this induced voltage is measured as V 3 2 Vh The CT turns ratio is now measured as Ratio V Vx or Ratio 2 3 Vh Vx This measured turns ratio is 2 3 higher than the actual turns ratio The EZCT 2000 will display the correct CT turns ratio by adjusting the measured turns ratio by 3 2 ...

Страница 54: ...splayed Press the 1 key SET TIME e The following screen will be displayed 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 ENTER MM DD YY HH MM SS 1 SET TIME 2 BURIED CT IN DELTA 1 RECORD DIRECTORY 2 ERASE RECORD 3 KNEE POINT MARKER 4 NEXT PAGE 1 RE...

Страница 55: ...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 and then select the correct tap connection c The following screen will be displayed Select the maximum output voltage on the X terminals by pressing the corresponding key 1 5 d The following screen will be displayed Press the ENTER key to continue e The following screen will b...

Страница 56: ...key to increase or decrease the Vx 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 DIAGNOSTIC Vx 2 2 Ix 0 001A Vh 0 07 STOP TO EXIT ...

Страница 57: ...to verify the EZCT 2000 s Vx sense circuit a Connect the X cables to an RMS volt meter as shown in Figure 15 b Select the EZCT 2000 s Diagnostics mode see section 5 1 c Press the PAPER Contrast key to raise the Vx voltage d Verify the Vx voltage displayed on the EZCT 2000 LCD screen against the value displayed on the external volt meter e Press the STOP key to end the test Figure 15 EZCT 2000 Vx V...

Страница 58: ...EZCT 2000 s Ix 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 2000 s Diagnostics mode see section 5 1 c Press the PAPER Contrast key to raise the Vx voltage d Verify the Ix voltage displayed on the EZCT 2000 s LCD screen against the value displayed on the external RMS ampere meter e Press the STOP key to end the test Figure ...

Страница 59: ...t 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 Run a turns ratio test see section 3 3 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 Figure 17 EZCT 2000 Turns Ratio Verification Test Connections ...

Страница 60: ... executes is an excitation test If the excitation current did not reach at least 0 8A the CT is not completely de magnetized Raise the excitation voltage setting in the test plan Re run the excitation test You can quickly verify if the CT was de magnetized by looking at the last excitation graph When running the excitation test the Vx reading is erratic The EZCT 2000 X cable may be opened Each X c...

Страница 61: ...S Hellman Ave Ontario CA 91761 USA Phone 909 923 9390 Fax 909 923 9391 www vanguard instruments com Copyright 2009 by Vanguard Instruments Company Inc EZCT 2000 User s Manual Revision 3 3 December 4 2009 TA ...

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