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Vanguard Instruments EZCT, Руководство по эксплуатационным процедурам

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Operating Procedures

EZCT and EZCT-10

12

5.0 EZCT CABLE CONNECTIONS

Always connect the EZCT to 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 current transformer excitation test. The H and X cable
connection is required to run the transformer ratio test. A typical connection is shown in figure 3.

Figure 3 Typical EZCT Cable Connection

Содержание EZCT

Страница 1: ...PERATING PROCEDURES for the EZCT and EZCT 10 Digital Current Transformer Tester Vanguard Instruments Co Inc 1520 S Hellman Ave Ontario California 91761 TEL 909 923 9390 July 2005 FAX 909 923 9391 REV...

Страница 2: ......

Страница 3: ...be off line and fully isolated Always ground the EZCT and EZCT 10 to a substation ground before connecting the test cables to a transformer Precaution with High Test Voltage Because the EZCT can prod...

Страница 4: ......

Страница 5: ...EZCT Printer Paper 11 5 0 EZCT CABLE CONNECTIONS 12 6 0 OPERATING PROCEDURES 15 6 1 Run Test Procedure 15 6 1 1 Run Excitation and Ratio test 15 6 1 2 Run Ratio Only Test 21 6 2 EZCT Test Record ID 2...

Страница 6: ...35 Table 14 Computer Interface Procedures 36 Table 15 Set Clock Procedures 37 Table 16 Set Knee Point Marker Procedures 38 Table 17 Print Impedance Procedures 39 Table 18 EZCT Diagnostic Procedures 41...

Страница 7: ...ration only requires connecting the test leads to the current transformer primary and secondary windings and following the test sequence displayed on the LCD Knee point voltages IEEE 45 IEEE 30 ANSI 1...

Страница 8: ...l features The only difference is that the EZCT 10 has more output current on the 50Vac and the 200Vac test voltages The EZCT test voltage and current output ranges are 50Vac 2A 200Vac 2A 1200Vac 1 2A...

Страница 9: ...0 degree DISPLAY Backlit LCD 4 lines by 20 characters CONTROLS Keypad 10 alpha numeric keys and 6 function keys PRINTER Thermal printer prints on 4 5 inch wide thermal paper COMPUTER INTERFACE RS 232C...

Страница 10: ...uracy 1 0 degree DISPLAY Back lit LCD 4 lines by 20 characters CONTROLS Keypad 10 alpha numeric keys and 6 function keys PRINTER Thermal printer prints on 4 5 inch wide thermal paper COMPUTER INTERFAC...

Страница 11: ...enced to a functional description in Table 3 0 which describes the purpose of each item on the control panel Although the purpose of these controls and the display may seem obvious users should become...

Страница 12: ...60Hz I O Input power connector with third wire safety ground and 20A built in circuit breaker 7 no marking AC receptacle 8 GROUND Ground Stud 9 RS 232C Connector 9 pin Serial interface port connector...

Страница 13: ...ctional description in Table 4 0 which describes the purpose of each item on the control panel Although the purpose of these controls and the display may seem obvious users should become familiar with...

Страница 14: ...0 60Hz I O Input power connector with third wire safety ground and 20A built in circuit breaker 7 no marking AC receptacle 8 GROUND Ground Stud 9 RS 232C Connector 9 pin Serial interface port connecto...

Страница 15: ...C o n t r a s t s w i t c h o n c e P a p e r w i l l a d v a n c e f r o mp r i n t e r P r e s s P a p e r C o n t r a s t s w i t c h o n c e p a p e r w i l l m o v e b a c k w a r d i n t o p r i...

Страница 16: ...ng 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 current transformer excitation test The H and X cable conne...

Страница 17: ...Operating Procedures EZCT and EZCT 10 13 Figure 4 Connection to CTs on Wye Transformer Figure 5 Connection to CTs on a Delta Transformer...

Страница 18: ...Operating Procedures EZCT and EZCT 10 14 Figure 6 Typical EZCT Connection to Multiple CTs...

Страница 19: ...e is lowered to zero or because of the CT excitation curve characteristics The Knee point voltages using IEEE 45 IEEE 30 ANSI 10 50 standards are calculated and printed on the tabulated report The CT...

Страница 20: ...R A T I O T E S T m e n u w i l l appear 5 8 Run the transformer ratio test by pressing key 1 YES 5 9 To have the EZCT calculate the percentage error enter the transformer nameplate ratio by pressing...

Страница 21: ...4 None Wait for the printer to finish printing the test report 5 15 Press key 1 to keep the test results in working memory Continue on 5 16 NOTE If the EZCT memory contains test data f r o ma p r e v...

Страница 22: ...d in FLASH EEPROM 5 19 Press the STOP key to return to the main menu 5 20 None The user selected not to save the test record a reminder message is displayed 5 21 Press key 2 to save record Continue on...

Страница 23: ...Operating Procedures E Z C T a n dE Z C T 1 0 19 Figure 7 Typical EZCT Tabulated Report Printout Phase angle and measurement CT Turns ratio Test Results Knee Point Voltage ANSCI 10 50...

Страница 24: ...Operating Procedures E Z C T a n dE Z C T 1 0 20 Figure 8 Typical EZCT Excitation Graph Knee Point Marker...

Страница 25: ...report is shows in Figure 9 Table 6 Run Ratio Only Test STEP ACTION DISPLAY 6 1 None EZCT Main menu 6 2 Begin RUN TEST procedure Press key 1 RUN TEST on the MAIN MENU 6 3 Select Ratio Only Test by pre...

Страница 26: ...s ratio test 6 7 P r e s st h e E N T E R k e yt oa c c e p tt h e ratio 6 8 Press key 1 YES to print the test report 6 9 None Wait for the printer to finish printing the test report 6 10 Press key 1...

Страница 27: ...ved in FLASH EEPROM 6 14 Press the STOP key to return to the Main menu NOTE A typical test contains an excitation and turns ratio test A record may contain 10 tests An EZCT will store 128 records This...

Страница 28: ...me using the alpha numeric keypad When finished press ENTER to store the data and go to the S T A T I O N i d e n t i f i c a t i o n s c r e e n 7 5 Enter the utility STATION name using the alpha num...

Страница 29: ...tore the data and go to the C O MME N T S i d e n t i f i c a t i o n s c r e e n 7 10 Enter test COMMENTS using the alpha numeric keypad When finished press ENTER to store the data and go to the O P...

Страница 30: ...manually entering the header information via the keypad T h e f o l l o w i n g p r o c e d u r e p r i n t s a l l t h e t e s t r e c o r d I D s s t o r e d i n t h e E Z C T s m e m o r y Table 8...

Страница 31: ...Operating Procedures E Z C T a n dE Z C T 1 0 27 Figure 10 Test Record ID Directory Printout...

Страница 32: ...ng them to the EZCT Table 9 Load Test Record ID Directory Procedure STEP ACTION EZCT DISPLAY 9 1 On the MAIN MENU Press key 2 SETUP to go to the Setup menu options shown at right 9 2 P r e s s k e y 1...

Страница 33: ...TUP MENU options shown at right 10 2 P r e s s k e y 3 t o s e l e c t R E S T O R ER E C O R D 10 3 Press key 1 to restore a record 10 4 Press key 1 to enter the record number 10 5 Enter the record n...

Страница 34: ...sing the built in thermal printer If more than one test is included in a test record the excitation curves will be combined and printed on one graph The user can print test record residing in EZCT wor...

Страница 35: ...Operating Procedures E Z C T a n dE Z C T 1 0 31 F i g u r e1 1T y p i c a l E Z C T A b b r e v i a t e d T a b u l a t e dR e s u l t sP r i n t O u t...

Страница 36: ...Operating Procedures E Z C T a n dE Z C T 1 0 32 Figure 12 Typical Graphic Results Print Out With Multiple Excitation Curves...

Страница 37: ...ey 3 RESTORE RECORD 12 3 Press key 2 DIRECTORY 12 4 Press key 1 FULL DIRECTORY to generate a list of all the records stored in memory Press key 2 SHORT DIRECTORY to generate a list of the last 10 reco...

Страница 38: ...Operating Procedures E Z C T a n dE Z C T 1 0 34 Figure 13 Typical Test Record Directory Printout...

Страница 39: ...lay press key 1 to erase a single record Go to step 13 6 to erase all test records 13 5 Enter record number of the record to be deleted then press the ENTER key to confirm Press the ENTER key again to...

Страница 40: ...l the EZCT to run any test available from the Front Panel Table 14 Computer Interface Procedures STEP ACTION EZCT DISPLAY 14 1 On the MAIN MENU press key 2 SETUP to select the SETUP MENU options shown...

Страница 41: ...ect the SETUP MENU options shown at right 15 2 Press key 4 NEXT PAGE 15 3 Press key 2 SET TIME 15 3 Enter the month day year hour minute and seconds for the real time clock The display will now return...

Страница 42: ...ISPLAY On the MAIN MENU press key 2 SETUP to select the SETUP MENU options shown at right 16 1 Press key 4 NEXT PAGE 16 2 Press key 3 KNEE POINT MARKER 16 3 Press key 1 2 or 3 to select the preferred...

Страница 43: ...edures Table 17 Print Impedance Procedures STEP ACTION EZCT DISPLAY 17 1 On the MAIN MENU press key 2 SETUP to select the SETUP MENU options shown at right 17 2 Press key 4 NEXT PAGE 17 3 Press key 4...

Страница 44: ...Operating Procedures E Z C T a n dE Z C T 1 0 40 Figure 14 Tabulated Report with Impedance Print Out...

Страница 45: ...th pairs of X1 and X2 cables must be connected to the excitation voltage Vx and the H1 H2 cables must be connected to sense the Vh voltage in order for this mode to work properly Table 18 EZCT Diagnos...

Страница 46: ...n on X voltage 2 Cannot saturate CT Excitation voltage range is too low Turn voltage knob to zero and change voltage selection 3 See voltage on display but current reading remains at 0A Open connectio...

Страница 47: ...43 1520 S Hellman Ave Ontario CA 91761 USA Phone 909 923 9390 Fax 909 923 9391 Website http www vanguard instruments com EZCT 07 13 06 OAK...

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