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REV 3

 

EZCT S2 USER’S MANUAL

 

 

33

 

 

 

 

 

Figure 8. Typical EZCT S2 Flash EEPROM Test Plan Directory Printout 

 

Содержание EZCT S2

Страница 1: ...EZCT S2TM 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 December 2009 Revision 3...

Страница 2: ...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 transforme...

Страница 3: ...S2 s Memory 26 3 3 4 Erasing Test Records From the Flash EEPROM 28 3 4 Working With Test Plans 30 3 4 1 Extracting the Test Plan From a Test Record 30 3 4 2 Printing a Directory of Test Plans Stored...

Страница 4: ...Bushing CT Connection on Y Transformer 10 Figure 5 Typical EZCT S2 Tabulated Report Printout 19 Figure 6 Typical EZCT S2 Graphic Report 21 Figure 7 Typical Internal Test Record Directory Printout 27...

Страница 5: ...ed as SCREEN MENU NAME The terms test record and test shot are used interchangeably EZCT S2 LCD screen output is shown as When instructions are provided the menu item that should be selected is shown...

Страница 6: ...red 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 excitati...

Страница 7: ...tions 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 process since it also provides instructions for making the proper...

Страница 8: ...rs 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 b...

Страница 9: ...nctional 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 the...

Страница 10: ...ransformer primary input test cable connector 3 Built in 4 5 inch wide thermal printer 4 110 120 Vac 12A 50 60Hz Power switch with built in circuit breaker 5 Power receptacle 6 GROUND Ground terminal...

Страница 11: ...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 S2...

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 coatin...

Страница 13: ...s 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...

Страница 14: ...EZCT S2 USER S MANUAL REV 3 10 Figure 3 Bushing CT Connection on Delta Transformer Figure 4 Bushing CT Connection on Y Transformer...

Страница 15: ...e 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...

Страница 16: ...ype 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...

Страница 17: ...ic 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 save...

Страница 18: ...by pressing the corresponding key 1 3 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 vi...

Страница 19: ...CT s a maximum test current of 1A is recommended 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...

Страница 20: ...in 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...

Страница 21: ...layed 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 S2 tabulated test report printout is shown in Figure 5 A ty...

Страница 22: ...YES to save the record The following screen will be displayed momentarily q The following confirmation screen will then be displayed NOTE The test record number is automatically assigned to each test...

Страница 23: ...REV 3 EZCT S2 USER S MANUAL 19 Figure 5 Typical EZCT S2 Tabulated Report Printout...

Страница 24: ...dary winding 6 Impedance calculated at each data point 7 The voltage current and impedance data points recorded on the graph grid marks 8 ASA 10 50 knee point voltage and excitation current This is eq...

Страница 25: ...REV 3 EZCT S2 USER S MANUAL 21 Figure 6 Typical EZCT S2 Graphic Report Knee Point Marker...

Страница 26: ...n 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 follo...

Страница 27: ...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...

Страница 28: ...ll 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 volta...

Страница 29: ...played 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 Press the 1 key to print the tabulated data and graphics results on the th...

Страница 30: ...s stored in the EZCT S2 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...

Страница 31: ...REV 3 EZCT S2 USER S MANUAL 27 Figure 7 Typical Internal Test Record Directory Printout...

Страница 32: ...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 w...

Страница 33: ...ds stored in the EZCT S2 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...

Страница 34: ...xtract 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 te...

Страница 35: ...racted Please see section 3 3 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 S2 s Flash EEPROM as a...

Страница 36: ...ng 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 t...

Страница 37: ...REV 3 EZCT S2 USER S MANUAL 33 Figure 8 Typical EZCT S2 Flash EEPROM Test Plan Directory Printout...

Страница 38: ...ike 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 th...

Страница 39: ...f 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...

Страница 40: ...ey 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...

Страница 41: ...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 men...

Страница 42: ...ll 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 n...

Страница 43: ...as been loaded first 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 dis...

Страница 44: ...l unload the test plan from the working memory and bring up the standard RUN TEST menu Please see section 3 2 2 step b c The following screen will be displayed Press the ENTER key d The following scre...

Страница 45: ...u 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 The follo...

Страница 46: ...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 H...

Страница 47: ...rs 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...

Страница 48: ...ARKER 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 w...

Страница 49: ...en will be displayed Press the 1 key YES to save the test record with the updated knee point marker setting Press the 2 key NO if you do not want to update the saved test record Figure 10 Graphic Repo...

Страница 50: ...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 k...

Страница 51: ...Buried CT in Delta option will stay active for all subsequent tests performed Turning off the EZCT S2 will reset this option Figure 11 Buried CT in a Delta Transformer Illustration 1 Figure 12 Buried...

Страница 52: ...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 high...

Страница 53: ...ayed 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 enter...

Страница 54: ...ge on the X terminals by pressing the corresponding key 1 4 c The following screen will be displayed Press the ENTER key to continue d The following screen will be displayed and the Vx Vh and Ix value...

Страница 55: ...to verify the EZCT S2 s Vx sense circuit a Connect the X cables to an RMS volt meter as shown in Figure 13 b Select the EZCT S2 s Diagnostics mode see section 5 1 c Press the PAPER Contrast key to rai...

Страница 56: ...EZCT S2 s Ix sense circuit a Connect the X cables to a power resistor and an RMS ampere meter as shown in Figure 14 b Select the EZCT S2 s Diagnostics mode see section 5 1 c Press the PAPER Contrast k...

Страница 57: ...Connect the X1 test lead to the H1 test lead as shown in Figure 15 b Connect the X2 test lead to the H2 test lead as shown in Figure 15 c Run a turns ratio test see section 3 2 2 d Observe the turns...

Страница 58: ...emagnetized by looking at the last excitation graph Select a higher test voltage for the test When running the excitation test the Vx reading is erratic The EZCT S2 X cable may be opened Each X cable...

Страница 59: ...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 S2 User s Manual Revision 3 0 December 4 200...

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