Instruction Manual

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EZCT-2000A

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

March 2014

Revision 1

Summary of content (103 pages)

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EZCT-2000ATM DIGITAL CURRENT-TRANSFORMER TESTER USER’S MANUAL Vanguard Instruments Company, Inc. 1520 S. Hellman Ave.
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EZCT-2000A USER’S MANUAL REV 1 SAFETY SUMMARY FOLLOW EXACT OPERATING PROCEDURES Any deviation from the procedures described in this User’s Manual may create one or more safety hazards, may damage the EZCT-2000A, or cause errors in the test results. Vanguard Instruments Company, Inc. assumes no liability for unsafe or improper use of the EZCT-2000A.
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REV 1 EZCT-2000A USER’S MANUAL TABLE OF CONTENTS CONVENTIONS USED IN THIS DOCUMENT ....................................................................... 1 1.0 INTRODUCTION .................................................................................................................... 2 1.1 General Description and Features ................................................................................... 2 1.2 Furnished Accessories ....................................................................
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EZCT-2000A USER’S MANUAL REV 1 4.3 Setting the Clock ............................................................................................................ 81 5.0 DIAGNOSTICS, VERIFICATION, AND TROUBLESHOOTING ................................................. 83 5.1 Performing a Diagnostics Test ....................................................................................... 83 5.2 Verifying the EZCT-2000A’s Vx Sense Circuit Using an External Meter ......................... 85 5.
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REV 1 EZCT-2000A USER’S MANUAL CONVENTIONS USED IN THIS DOCUMENT This document uses the following conventions: • A key or switch on the EZCT-2000A is indicated as [KEY] and [SWITCH]. • Menu options are referenced as (MENU OPTION). • Screen and menu names are referenced as “SCREEN/MENU NAME”. • The terms “test record” and “test shot” are used interchangeably. • EZCT-2000A LCD screen output is shown as: 1. 2. 3. 4. 5.
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EZCT-2000A USER’S MANUAL 1.0 INTRODUCTION 1.1 General Description and Features REV 1 The EZCT-2000A is Vanguard’s third-generation microprocessor-based current transformer test set. The EZCT-2000A can perform the current transformer (CT) excitation test, measure the CT winding resistance and CT current-ratio automatically. All of the EZCT-2000A’s test leads can be connected to the CT output terminals (X1, X2, X3, X4 and X5), eliminating the need for lead switching during testing.
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REV 1 EZCT-2000A USER’S MANUAL Test Record Header Information Test record header information can include the company name, substation name, circuit ID, manufacturer, CT serial number, operator’s name and test record comments. In addition to the test record header, a 20-character test description for each test in the record (10 tests per record) can also be entered. Internal Test Record Storage Capacity The EZCT-2000A can store up to 140 test records in Flash EEPROM.
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EZCT-2000A USER’S MANUAL 1.
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REV 1 1.3 EZCT-2000A USER’S MANUAL Technical Specifications Table 1. EZCT-2000A Technical Specifications TYPE Portable current-transformer test set PHYSICAL SPECIFICATIONS 16.8”W x 12.6”H x 14”D (42.7 cm x 32.0 cm x 35.6 cm); Weight: 60 lbs (27.2 Kg) INPUT POWER 100 – 120 Vac or 200 – 240 Vac (factory pre-set), 50/60 Hz MEASUREMENT METHOD ANSI/IEEE C57.12.90, IEC 60044-1 and ANSI/IEEE C57.13.
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EZCT-2000A USER’S MANUAL 1.4 REV 1 EZCT-2000A Controls and Indicators The EZCT-2000A’s controls and indicators are shown in Figure 1 below. A leader line with an index number points to each control and indicator, which is cross-referenced to a functional description in Table 2. The table describes the function of each item on the control panel. The purpose of the controls and indicators may seem obvious, but users should become familiar with them before using the EZCT-2000A.
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REV 1 EZCT-2000A USER’S MANUAL Table 2. Functional Descriptions of EZCT-2000A Controls and Indicators Item Number Panel Markings Functional Description 1-5 X1, X2, X3, X4, X5 Current transformer excitation voltage connectors. Each set of connectors contains a test voltage connector and sensing connector. The EZCT-2000A’s X output terminals are rated to 2000 Vac working voltage. Any voltage above 2000 Vac will damage the input circuitry. 6 H 7 GROUND Grounding stud. 8 AC receptacle.
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EZCT-2000A USER’S MANUAL 2.0 PRE-TEST SETUP 2.1 Operating Voltages REV 1 The EZCT-2000A’s operating voltage is preset at the factory for 100-120 Vac, 50/60 Hz or 200240 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 ∨ Contrast] key for two seconds.
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REV 1 2.5 EZCT-2000A USER’S MANUAL Replacing the Thermal Printer Paper The roll of thermal paper is housed inside a dispenser underneath the printer cover. To replace the paper, follow the steps below: • • • • • • • Unscrew the two large printer cover screws and remove the printer cover. Remove the leftover thermal paper roll from the paper holder. Unroll the new thermal paper roll. Feed the thermal paper into the slot between the paper pocket and the rubber roller.
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EZCT-2000A USER’S MANUAL 3.0 OPERATING PROCEDURES 3.1 EZCT-2000A Cable Connections REV 1 Always connect the EZCT-2000A to the substation ground before connecting any test cables. The EZCT-2000A is supplied with one 20-foot X cable set 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.
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REV 1 EZCT-2000A USER’S MANUAL Figure 3. Bushing CT Connection on Delta Transformer Figure 4.
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EZCT-2000A USER’S MANUAL 3.2 REV 1 EZCT-2000A X Input Voltage Warning The EZCT-2000A X output terminals are rated to 2,000 Vac working voltage. Any voltage present at these terminals above 2,000 Vac may damage the X sense circuitry, cause false readings, or both. An example of a typical situation where this may occur is shown in Figure 5 below. Figure 5. Sample CT Name Plate For the above example CT, the turns ratio between X1-X4 is 3150 to 1. The turns ratio between X1-X2 is 400 to 1.
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REV 1 3.3 EZCT-2000A USER’S MANUAL Performing Tests 3.3.1. 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.
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EZCT-2000A USER’S MANUAL REV 1 d. The following screen will be displayed: STATION: LAB ↑↓ TO POSITION "enter" to accept Type the station name using the alpha-numeric keypad and then press the [ENTER] key. e. The following screen will be displayed: CIRCUIT: CIRCUIT 1 ↑↓ TO POSITION "enter" to accept Type the circuit information using the alpha-numeric keypad and then press the [ENTER] key. f.
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REV 1 EZCT-2000A USER’S MANUAL h. The following screen will be displayed: SERIAL NUMBER: 27001 ↑↓ TO POSITION "enter" to accept Type the serial number using the alpha-numeric keypad and then press the [ENTER] key. i. The following screen will be displayed: COMMENTS: no comment ↑↓ TO POSITION "enter" to accept Enter any relevant comments using the alpha-numeric keypad and then press the [ENTER] key. j.
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EZCT-2000A USER’S MANUAL REV 1 3.3.2. Performing Resistance, Excitation, and Ratio Tests The following procedure describes the general steps for performing excitation, resistance, and ratio tests. a. When the EZCT-2000A 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: 1. 2. 3. 4. RUN TEST SETUP TEST PLANS DIAGNOSTIC 02/14/10 10:24:25 Press the [1] key (RUN TEST) to start a test. b.
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REV 1 EZCT-2000A USER’S MANUAL e. If the selected test included an excitation test, the following screen will be displayed: SET TEST CURRENT: 1. 0.2A 2. 0.5A 3. 1A 4. 2A 5. 5A 6. 10A Select the maximum test current for the excitation test by pressing the corresponding key ([1] - [6]). Most CT’s will saturate before the excitation current reaches 1A. To reduce stress on CT’s, a maximum test current of 1A is recommended. NOTE f.
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EZCT-2000A USER’S MANUAL ENTER PLATE RATIO: 1000 : 0.0 REV 1 ENTER PLATE RATIO: 1000 : 5.0 Type the second number using the keypad and then press the [ENTER] key. Continue to step g. 2. NO Press the [2] key if you do not want to enter the CT nameplate values. Continue to step g. g. The following screen will be displayed: ENTER TEST 1 NOTE: _ ↑↓ to position "ENTER" TO ACCEPT Use the alpha-numeric keys on the keypad to enter a test note. The test note field is 20 characters long.
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REV 1 EZCT-2000A USER’S MANUAL If you had selected a test current greater than 1 Amp in step e, the following screen will be displayed: NOTE SATURATION CUR WILL BE REDUCED TO 1 AMP. (PRESS ANY KEY...) Press any key to continue. ENTER BURDEN VA: (500.0 max) 0.0 Type the burden value using the keypad and then press the [ENTER] key. j. The following screen will be displayed: ENTER cos ϕ: (0.00 - 1.00) 0.0 Type the Cos ϕ value using the keypad and then press the [ENTER] key. k.
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EZCT-2000A USER’S MANUAL l. REV 1 The following screen will be displayed showing a summary of the test parameters: TEST 1 parameters: 1200V 1.0A x1-x2 "START" to begin Press the [START] key to start the test. m. If the selected test included a resistance test, the following screen will be displayed momentarily: CABLES ENERGIZED! 1200V 1.0A x1-x2 DC RESISTANCE TEST The following screen will then be displayed: CABLES ENERGIZED! 1200V 1.0A x1-x2 RESISTANCE = 215.
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REV 1 EZCT-2000A USER’S MANUAL RATIO TEST Vx = 79.5 I=0.0532 VH = 0.3970 RAT=+200.09 When the testing is finished, the test results graph will be displayed: Press any key on the keypad to continue. o. The following screen will be displayed: print test results? 1. YES 2. NO 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-2000A tabulated test report printout is shown in Figure 6.
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EZCT-2000A USER’S MANUAL REV 1 q. The following screen will be displayed: TEST 1 SAVED Press any key to continue. r. The following screen will be displayed: RUN ANOTHER TEST? 1. YES 2. NO Press the [2] key (NO). s. The following screen will be displayed: SAVE THIS RECORD? 1. YES 2. NO Press the [1] key (YES) to save the record. The following screen will be displayed momentarily: SAVING RECORD... PLEASE WAIT...
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REV 1 EZCT-2000A USER’S MANUAL t. The following confirmation screen will then be displayed: RECORD NUMBER 1 has been saved! The test record number is automatically assigned to each test record stored in the EZCT-2000A’s Flash EEPROM. NOTE Press any key to return to the “START-UP” menu.
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EZCT-2000A USER’S MANUAL REV 1 Figure 6.
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REV 1 EZCT-2000A USER’S MANUAL Table 3. Descriptions of Tabulated Test Results Elements Item Number 25 Description 1 Test record header information. 2 The EZCT-2000A X terminals (taps) that were selected for this test. 3 Test note for this particular test. The test note can be up to 20-characters long. 4 Recorded excitation current readings on the CT secondary winding. 5 Recorded excitation test voltages applied to the CT secondary winding. 6 Impedance calculated at each data point.
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EZCT-2000A USER’S MANUAL REV 1 Knee Point Marker Figure 7. Typical EZCT-2000A Graphic Report Figure 8.
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REV 1 3.4 EZCT-2000A USER’S MANUAL Working With Test Records 3.4.1. Restoring and Printing a Test Record From Flash EEPROM You can restore a test record from the EZCT-2000A’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. 2. 3. 4. RUN TEST SETUP TEST PLANS DIAGNOSTIC 02/16/10 10:24:25 Press the [2] key (SETUP). b. The following screen will be displayed: 1. 2. 3. 4. 5.
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EZCT-2000A USER’S MANUAL REV 1 1. INTERNAL STORAGE 2. THUMB DRIVE Press the [1] key (INTERNAL STORAGE). The following screen will then be displayed: RESTORE RECORD 1. enter record number 2. scroll to select Continue with the steps below. 1. ENTER RECORD NUMBER If you know the record number that you would like to restore, press the [1] key. The following screen will be displayed: RESTORE RECORD NUMBER: Type the record number using the alpha-numeric keypad and then press the [ENTER] key.
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REV 1 EZCT-2000A USER’S MANUAL The following screen will be displayed: RECORD RESTORED! PRINT RECORD? 1. YES 2. NO If you do not want to print the test record, press the [2] key (NO). The test record will be restored to the working memory, and you will be returned to the “STARTUP” menu. If you would like to print the test record, press the [1] key (YES). Continue to step d. 2. SCROLL TO SELECT Press the [2] key if you would like to scroll through a directory of the stored test records.
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EZCT-2000A USER’S MANUAL REV 1 Press any key to continue. The following screen will be displayed: RECORD RESTORED! PRINT RECORD? 1. YES 2. NO If you do not want to print the test record, press the [2] key (NO). The test record will be restored to the working memory, and you will be returned to the “STARTUP” menu. If you would like to print the test record, press the [1] key (YES). Continue to step d. d. The following screen will be displayed: PRINT OPTIONS: 1. FULL DATA 2.
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REV 1 EZCT-2000A USER’S MANUAL 3.4.2. Restoring and Printing a Test Record From a USB Flash Drive You can restore a test record from a USB Flash drive to the EZCT-2000A’s working memory using the steps below: a. Make sure the USB Flash drive containing the test record(s) is inserted in the EZCT2000A’s USB Flash drive port (“USB MEM” port). Then start from the “START-UP” menu: 1. 2. 3. 4. RUN TEST SETUP TEST PLANS DIAGNOSTIC 02/14/10 07:39:39 Press the [2] key (SETUP). b.
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EZCT-2000A USER’S MANUAL REV 1 RESTORE THUMB DRIVE REC_ Type the record number that you would like to restore and press the [ENTER] key. If you do not know the record number, you can print a test record directory. Please see section 3.4.4 for details. f. The following screen will be displayed while the record is being restored: restoring thumb drive REC_001 PLEASE WAIT... Once the record has been restored, the record’s graph will be displayed as shown below: Press any key to continue. g.
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REV 1 EZCT-2000A USER’S MANUAL h. The following screen will be displayed: PRINT OPTIONS: 1. FULL DATA 2. ABBREVIATED data Press the [1] key to print the full tabulated data and graphics results on the thermal printer. After printing is finished, you will be returned to the “START-UP” menu. Press the [2] key to print the test report and graphic results on the thermal printer, without the excitation voltage and current data points. After printing has finished, you will be returned to the “START-UP” menu.
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EZCT-2000A USER’S MANUAL REV 1 3.4.3. Printing a Restored Test Record You can print a test record at the time that it is restored from the Flash EEPROM (see section 3.4.1), or you can restore it to the working memory and print it later. To print the current test record in the working memory: a. Start from the “START-UP” menu: 1. 2. 3. 4. RUN TEST SETUP TEST PLANS DIAGNOSTIC 02/14/10 07:39:39 Press the [2] key (SETUP). b. The following screen will be displayed: 1. 2. 3. 4. 5. 6.
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REV 1 EZCT-2000A USER’S MANUAL 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, without the excitation voltage and current data points. The test record will be printed on the thermal printer and you will be returned to the “START-UP” menu.
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EZCT-2000A USER’S MANUAL REV 1 3.4.4. Printing a Directory of Test Records Stored in the EZCT-2000A’s Memory You can print a directory of all the test records stored in the EZCT-2000A’s Flash EEPROM using the steps below: a. Start from the “START-UP” menu: 1. 2. 3. 4. RUN TEST SETUP TEST PLANS DIAGNOSTIC 02/16/10 10:24:25 Press the [2] key (SETUP). b. The following screen will be displayed: 1. 2. 3. 4. 5. 6.
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REV 1 EZCT-2000A USER’S MANUAL PRINT DIRECTORY 1. FULL DIRECTORY 2. SHORT DIRECTORY Continue with the steps below: Press the [1] key to print a full directory listing of all the test records stored in the EZCT2000A’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.
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EZCT-2000A USER’S MANUAL REV 1 Figure 9.
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REV 1 EZCT-2000A USER’S MANUAL 3.4.5. Printing a Directory of Test Records Stored in a USB Flash Drive You can print a directory of all the test records in a USB Flash drive using the steps below: a. Make sure the USB Flash drive is inserted in the EZCT-2000A’s USB Flash drive port (“USB MEM” port). Then start from the “START-UP” menu: 1. 2. 3. 4. RUN TEST SETUP TEST PLANS DIAGNOSTIC 02/16/10 10:24:25 Press the [2] key (SETUP). b. The following screen will be displayed: 1. 2. 3. 4. 5. 6.
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EZCT-2000A USER’S MANUAL REV 1 Figure 10.
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REV 1 EZCT-2000A USER’S MANUAL 3.4.6. Copying Test Records to a USB Flash Drive You can easily copy test records stored in the EZCT-2000A’s Flash EEPROM to a connected USB Flash drive using the steps below: a. Make sure a USB Flash drive is inserted in the EZCT-2000A’s Flash drive port (“USB MEM” port). Then start from the “START-UP” menu: 1. 2. 3. 4. RUN TEST SETUP TEST PLANS DIAGNOSTIC 02/16/10 10:24:25 Press the [2] key (SETUP). b. The following screen will be displayed: 1. 2. 3. 4. 5. 6.
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EZCT-2000A USER’S MANUAL REV 1 1. COPY SINGLE RECORD Press the [1] key (COPY SINGLE RECORD) if you would like to copy a single record from the EZCT-2000A to the USB Flash drive. The following screen will be displayed: ENTER RECORD NUMBER to copy to flash drv NUMBER: Type the record number that you would like to copy to the USB Flash drive and then press the [ENTER] key. If you do not know the record number, you can first print a test record directory using the instructions in section 3.4.4.
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REV 1 EZCT-2000A USER’S MANUAL 2. COPY ALL RECORDS Press the [2] key (COPY ALL RECORDS) if you would like to copy all the test records from the EZCT-2000A to the USB Flash drive. The following screen will be displayed: SAving record 1 to thumb drive Please wait... The above progress screen will be displayed for each test record being copied.
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EZCT-2000A USER’S MANUAL REV 1 3.4.7. Erasing Test Records From the Flash EEPROM You can erase individual or all test records stored in the EZCT-2000A’s Flash EEPROM. To erase a test record: a. Start from the “START-UP” menu: 1. 2. 3. 4. RUN TEST SETUP TEST PLANS DIAGNOSTIC 02/16/10 10:24:25 Press the [2] key (SETUP). b. The following screen will be displayed: 1. 2. 3. 4. 5. 6. RECORD ID PRINT RECORD RECORD DIRECTORY SAVE/RES RECORD ERASE RECORD NEXT PAGE Press the [5] key (ERASE RECORD). c.
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REV 1 EZCT-2000A USER’S MANUAL ERASE RECORD 1. ERASE SINGLE REC. 2. ERASE ALL RECORDS Continue with the steps below: 1. ERASE SINGLE REC. Press the [1] key if you would like to erase a single record. The following screen will be displayed: ERASE RECORD NUMBER: Type the record number to be erased and press the [ENTER] key. • You can press the [STOP] key to cancel the process. NOTES • If you do not know the record number, you can first print a test record directory using the instructions in section 3.4.4.
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EZCT-2000A USER’S MANUAL REV 1 2. ERASE ALL RECORDS Press the [2] key if you would like to erase all of the test records stored in the EZCT-2000A’s flash EEPROM. The following confirmation screen will be displayed: ERASE ALL RECORDS! Are you sure? "ENTER" TO CONTINUE. 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.
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REV 1 EZCT-2000A USER’S MANUAL 3.4.8. Erasing Test Records From a USB Flash Drive You can erase individual or all test records stored in a USB Flash drive. To erase a test record: a. Make sure the USB Flash drive is inserted in the EZCT-2000A’s USB Flash drive port (“USB MEM” port). Then start from the “START-UP” menu: 1. 2. 3. 4. RUN TEST SETUP TEST PLANS DIAGNOSTIC 02/16/10 10:24:25 Press the [2] key (SETUP). b. The following screen will be displayed: 1. 2. 3. 4. 5. 6.
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EZCT-2000A USER’S MANUAL REV 1 d. The following screen will be displayed: ERASE RECORD 1. ERASE SINGLE REC. 2. ERASE ALL RECORDS "STOP" TO EXIT 1. ERASE SINGLE REC. Press the [1] key (ERASE SINGLE REC.) if you would like to erase a single record. The following screen will be displayed: ERASE THUMB DRIVE REC_ Type the record number to be erased and press the [ENTER] key. • You can press the [STOP] key to cancel the process.
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REV 1 EZCT-2000A USER’S MANUAL 2. ERASE ALL RECORDS Press the [2] key (ERASE ALL RECORDS) if you would like to erase all of the test records stored in the USB Flash drive. The following confirmation screen will be displayed: ERASE ALL THUMB DRIVE RECORDS? ARE YOU SURE? "ENTER" TO CONTINUE. 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.
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EZCT-2000A USER’S MANUAL 3.5 REV 1 Working With Test Plans A test plan is comprised of the saturation test voltage, current range selection, CT nameplate ratios, and CT winding terminal combinations (X1 to X5) for each test. Up to 10 test definitions can be stored per test plan, and up to 128 CT test plans can be stored in the EZCT-2000A’s Flash EEPROM. The ability to use test plans makes CT testing an extremely simple process.
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REV 1 EZCT-2000A USER’S MANUAL If there is no test record in the working memory, the following screen will be displayed: NOTE no record loaded! Press any key to return to the “START-UP” menu. d. The following screen will be displayed: TEST PLAN NUMBER 1 has been saved! The test plan will be extracted from the test record in the working memory and will be saved to the EZCT-2000A’s Flash EEPROM as a new test plan. The test plan number will be automatically incremented by the EZCT-2000A.
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EZCT-2000A USER’S MANUAL REV 1 3.5.2. Printing a Directory of Test Plans Stored in the EZCT-2000A’s Memory You can print a directory of all the test plans stored in the EZCT-2000A’s Flash EEPROM using the steps below: a. Start from the “START-UP” menu: 1. 2. 3. 4. RUN TEST SETUP TEST PLANS DIAGNOSTIC 02/16/10 10:24:25 Press the [3] key (TEST PLANS). b. The following screen will be displayed: 1. 2. 3. 4. 5. 6. 7.
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REV 1 EZCT-2000A USER’S MANUAL 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 11 below. Figure 11.
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EZCT-2000A USER’S MANUAL REV 1 3.5.3. Printing a Directory of Test Plans Stored in a USB Flash Drive. To print a directory of all the test plans stored in a USB Flash drive: a. Make sure the USB Flash drive is inserted in the EZCT-2000A’s Flash drive port (“USB MEM” port). Then start from the “START-UP” menu: 1. 2. 3. 4. RUN TEST SETUP TEST PLANS DIAGNOSTIC 02/16/10 10:24:25 Press the [3] key (TEST PLANS). b. The following screen will be displayed: 1. 2. 3. 4. 5. 6. 7.
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REV 1 EZCT-2000A USER’S MANUAL Figure 12.
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EZCT-2000A USER’S MANUAL REV 1 3.5.4. Printing a Test Plan To print a test plan: a. Start from the “START-UP” menu: 1. 2. 3. 4. RUN TEST SETUP TEST PLANS DIAGNOSTIC 02/16/10 10:24:25 Press the [3] key (TEST PLANS). b. The following screen will be displayed: 1. 2. 3. 4. 5. 6. 7. load test plan unload test plan plan directory extract test plan print test plan erase test plan copy to thumb drive Press the [5] key (PRINT TEST PLAN). c.
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REV 1 EZCT-2000A USER’S MANUAL Figure 13. Typical Test Plan Printout Table 4. Description of Test Plan Elements Item Number 57 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.
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EZCT-2000A USER’S MANUAL REV 1 3.5.5. Erasing Test Plans From the Flash EEPROM To erase one or all test plans from the EZCT-2000A’s Flash EEPROM: a. Start from the “START-UP” menu: 1. 2. 3. 4. RUN TEST SETUP TEST PLANS DIAGNOSTIC 02/16/10 10:24:25 Press the [3] key (TEST PLANS). b. The following screen will be displayed: 1. 2. 3. 4. 5. 6. 7. load test plan unload test plan plan directory extract test plan print test plan erase test plan copy to thumb drive Press the [6] key (ERASE TEST PLAN). c.
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REV 1 EZCT-2000A USER’S MANUAL ERASE TEST PLAN 1. ERASE SINGLE PLAN 2. ERASE ALL PLANS Continue with the steps below: 1. ERASE SINGLE PLAN Press the [1] key if you would like to erase a single test plan. The following screen will be displayed: ERASE TEST PLAN NUMBER: Type the test plan number that you would like to erase and press the [ENTER] key. NOTES • You can press the [STOP] key to cancel the process.
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EZCT-2000A USER’S MANUAL REV 1 ERASE ALL PLANS! Are you sure? "ENTER" TO CONTINUE. 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: ERASING all TEST PLANS PLEASE WAIT...
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REV 1 EZCT-2000A USER’S MANUAL 3.5.6. Erasing Test Plans From a USB Flash Drive To erase one or all test plans stored on a USB Flash drive: a. Make sure the USB Flash drive is inserted in the EZCT-2000A’s USB Flash drive port (“USB MEM” port). Then start from the “START-UP” menu: 1. 2. 3. 4. RUN TEST SETUP TEST PLANS DIAGNOSTIC 02/16/10 10:24:25 Press the [3] key (TEST PLANS). b. The following screen will be displayed: 1. 2. 3. 4. 5. 6. 7.
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EZCT-2000A USER’S MANUAL REV 1 1. ERASE SINGLE PLAN Press the [1] key (ERASE SINGLE PLAN) if you would like to erase a single plan from the USB Flash drive. The following screen will be displayed: ERASE THUMB DRIVE PLAN_ Type the test plan number that you would like to erase and press the [ENTER] key. NOTES • You can press the [STOP] key to cancel the process. • If you do not know the test plan number, you can print a test plan directory using the instructions in section 3.5.3.
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REV 1 EZCT-2000A USER’S MANUAL ERASING all thumb drive test plans PLEASE WAIT... The following screen will be displayed after all of the test plans have been erased from the USB Flash drive: all thumb drive test plans erased! Press any key to return to the “START-UP” menu.
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EZCT-2000A USER’S MANUAL REV 1 3.5.7. Loading a Test Plan from the EZCT-2000A’s Flash EEPROM To use a test plan for running a test, it must first be loaded into the working memory. To load a test plan from the EZCT-2000A’s Flash EEPROM into the working memory: a. Start from the “START-UP” menu: 1. 2. 3. 4. RUN TEST SETUP TEST PLANS DIAGNOSTIC 02/16/10 10:24:25 Press the [3] key (TEST PLANS). b. The following screen will be displayed: 1. 2. 3. 4. 5. 6. 7.
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REV 1 EZCT-2000A USER’S MANUAL LOAD TEST PLAN NUMBER: Continue with the steps below: 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: TEST PLAN LOADED! Press any key to return to the “START-UP” menu.
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EZCT-2000A USER’S MANUAL REV 1 3.5.8. Loading a Test Plan from a USB Flash Drive To load a test plan from a USB Flash drive: a. Make sure the USB Flash drive is inserted in the EZCT-2000A’s USB Flash drive port (“USB MEM” port). Then start from the “START-UP” menu: 1. 2. 3. 4. RUN TEST SETUP TEST PLANS DIAGNOSTIC 02/16/10 10:24:25 Press the [3] key (TEST PLANS). b. The following screen will be displayed: 1. 2. 3. 4. 5. 6. 7.
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REV 1 EZCT-2000A USER’S MANUAL e. The following screen will be displayed: PLAN_000 loaded! save plan internally? 1. YES 2. NO 1. YES Press the [1] key if you would like the loaded test plan to be also saved in the EZCT-2000A’s Flash EEPROM. Any existing test plans in the EZCT-2000A’s Flash EEPROM will not be over-written. The EZCT-2000A will automatically assign a new test plan number and store the test plan in the next available memory location.
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EZCT-2000A USER’S MANUAL REV 1 3.5.9. Running a Test Using a Loaded Test Plan Once a test plan has been loaded into the working memory (see sections 3.5.7 and 3.5.8 for directions), it can be used to run a test. To run a test using a loaded test plan: a. Make sure a test plan has been loaded into the working memory and then start from the “START-UP” menu: 1. 2. 3. 4. RUN TEST SETUP TEST PLANS DIAGNOSTIC 02/16/10 10:24:25 Press the [1] key (RUN TEST). b.
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REV 1 EZCT-2000A USER’S MANUAL When the test has finished, the following screen will be displayed: SAVE THIS RECORD? 1. YES 2. NO Press the [1] key (YES) to save the record. The following screen will be displayed momentarily: SAVING RECORD... PLEASE WAIT... Then the following confirmation screen will be displayed: RECORD NUMBER 2 has been saved! Press any key to return to the “START-UP” menu. 3. UNLOAD TEST PLAN Press the [3] key to unload the test plan and run a test without a test plan.
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EZCT-2000A USER’S MANUAL REV 1 c. The following screen will be displayed: ENTER TEST 1 NOTE: _ ↑↓ to position "ENTER" TO ACCEPT 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: TEST 1 parameters: 300V 2.0A x1-x2 "START" to begin Press the [START] key to begin the test. e. The EZCT-2000A will start performing the test per the test plan parameters.
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REV 1 EZCT-2000A USER’S MANUAL g. The following screen will be displayed: KEEP THIS TEST? 1. YES 2. NO Press the [1] key (YES) to keep the test results. h. The following screen will be displayed: TEST 2 SAVED Press any key to continue. i. The following screen will be displayed: SAVE THIS RECORD? 1. YES 2. NO Press the [1] key (YES) to save the record. The following screen will be displayed momentarily: SAVING RECORD... PLEASE WAIT...
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EZCT-2000A USER’S MANUAL REV 1 The following confirmation screen will then be displayed: RECORD NUMBER 2 has been saved! Press any key to return to the “START-UP” menu.
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REV 1 EZCT-2000A USER’S MANUAL 3.5.10. Unloading a Test Plan from the Working Memory To unload the test plan from the working memory and clear all the test plan parameters: a. Start from the “START-UP” menu: 1. 2. 3. 4. RUN TEST SETUP TEST PLANS DIAGNOSTIC 02/16/10 10:24:25 Press the [3] key (TEST PLANS). b. The following screen will be displayed: 1. 2. 3. 4. 5. 6. 7.
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EZCT-2000A USER’S MANUAL 4.0 CHANGING SETUP PARAMETERS 4.1 Setting the Knee Point Marker REV 1 Use the steps below to change the knee point marker for the excitation graph: a. Start from the “START-UP” menu: 1. 2. 3. 4. RUN TEST SETUP TEST PLANS DIAGNOSTIC 02/16/10 10:24:25 Press the [2] key (SETUP). b. The following screen will be displayed: 1. 2. 3. 4. 5. 6. RECORD ID PRINT RECORD RECORD DIRECTORY SAVE/RES RECORD ERASE RECORD NEXT PAGE Press the [6] key (NEXT PAGE). c.
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REV 1 EZCT-2000A USER’S MANUAL d. The following screen will be displayed: 1. IEEE 30 DEGREE 2. IEEE 45 DEGREE 3. IEC 10%V-->50%I Press either the [1] key (IEEE 30 DEGREE), the [2] key (IEEE 45 DEGREE), or the [3] key (IEC 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 14. Knee Point Marker Knee Point Marker Type Figure 14.
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EZCT-2000A USER’S MANUAL 4.2 REV 1 Enabling and Disabling the Buried CT in Transformer Delta Option 4.2.1. Enabling the Buried CT in Transformer Delta Option If you are measuring the turns ratio of a CT buried in the transformer Delta windings (see Figure 15 and Figure 16 for further information), you must first enable the “Buried CT in Delta” option from the “SETUP” menu using the steps below: a. Start from the “START-UP” menu: 1. 2. 3. 4.
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REV 1 EZCT-2000A USER’S MANUAL e. The following screen will be displayed: RATIOS WILL BE ADJUSTED by 2/3. ARE YOU SURE? 1. YES 2. NO Press the [1] key (YES). f. The following screen will be displayed: -buried ct in deltaratios 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. 2. 3. 4.
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EZCT-2000A USER’S MANUAL REV 1 c. The following screen will be displayed: 1. 2. 3. 4. SET TIME buried ct in delta knee point marker print raw data Press the [2] key (BURIED CT IN DELTA). d. The following screen will be displayed: 1. BURIED CT DELTA ON 2. BURIED CT DELTA OFF Press the [2] key (BURIED CT DELTA OFF). e. The following screen will be displayed: BURIED CT IN DELTA IS OFF. RATIOS DISPLAYED AS MEASURED. Press any key to return to the “START-UP” menu.
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REV 1 EZCT-2000A USER’S MANUAL Figure 15. Buried CT in a Delta Transformer Illustration 1 Figure 16.
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EZCT-2000A USER’S MANUAL • NOTES • • • REV 1 Vx . Vh Since the induced voltage (V) is sensed through the H1-H2 terminals of 2 the Delta winding, this induced voltage is measured as V = ( ) Vh. 3 Vx 3 Vx The CT turns ratio is now measured as Ratio = or Ratio = ( )( V 2 Vh 3 ). This measured turns ratio is higher than the actual turns ratio. 2 The EZCT-2000A will display the correct CT turns ratio by adjusting the 2 measured turns ratio by .
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REV 1 4.3 EZCT-2000A USER’S MANUAL Setting the Clock To set the EZCT-2000A’s internal clock: a. Start from the “START-UP” menu: 1. 2. 3. 4. RUN TEST SETUP TEST PLANS DIAGNOSTIC 02/16/10 10:24:25 Press the [2] key (SETUP). b. The following screen will be displayed: 1. 2. 3. 4. 5. 6. RECORD ID PRINT RECORD RECORD DIRECTORY SAVE/RES RECORD ERASE RECORD NEXT PAGE Press the [6] key (NEXT PAGE). c. The following screen will be displayed: 1. 2. 3. 4.
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EZCT-2000A USER’S MANUAL 4.4 REV 1 Printing Raw Memory Buffer Data You can print the raw data from the EZCT-2000A’s memory buffer for diagnostic purposes. This will print a table of current and voltage values stored in the unit’s working memory. To print the raw buffer data: a. Start from the “START-UP” menu: 1. 2. 3. 4. RUN TEST SETUP TEST PLANS DIAGNOSTIC 02/16/10 10:24:25 Press the [2] key (SETUP). b. The following screen will be displayed: 1. 2. 3. 4. 5. 6.
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REV 1 EZCT-2000A USER’S MANUAL 5.0 DIAGNOSTICS, VERIFICATION, AND TROUBLESHOOTING 5.1 Performing a Diagnostics Test The Diagnostics test mode displays the output voltage at the selected X leads (Vx), the voltage sensed by the H leads (Vh), and the X voltage excitation current (Ix). These values can then be verified using an external volt meter and ampere meter. To perform a diagnostic test: a. Start from the “START-UP” menu: 1. 2. 3. 4.
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EZCT-2000A USER’S MANUAL REV 1 d. The following screen will be displayed: caution! cables will be energized! "ENTER" to continue Press the [ENTER] key to continue. e. The following screen will be displayed and the Vx, Vh, and Ix values will be continuously updated for 15 seconds: DIAGNOSTIC Vx = 2.2 VH = 0.07 ix = 0.001A ↑↓ - "STOP" to exit You can press the [PAPER ∧ Contrast] or [PAPER ∨ Contrast] key to increase or decrease the Vx voltage, respectively.
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REV 1 5.2 EZCT-2000A USER’S MANUAL Verifying the EZCT-2000A’s Vx Sense Circuit Using an External Meter The excitation voltage (Vx) sensed by the EZCT-2000A can be verified using an external RMS volt meter. Follow the steps below to verify the EZCT-2000A’s Vx sense circuit: a. Connect the X cables to an RMS volt meter as shown in Figure 17. b. Select the EZCT-2000A’s Diagnostics mode (see section 5.1). c. Press the [PAPER ∧ Contrast] key to raise the Vx voltage. d.
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EZCT-2000A USER’S MANUAL 5.3 REV 1 Verifying the EZCT-2000A’s Ix Sense Circuit Using an External Meter You can verify the excitation current (Ix) sensed by the EZCT-2000A by using an external RMS ampere meter. Follow the steps below to verify the EZCT-2000A’s Ix sense circuit: a. Connect the X cables to a power resistor and an RMS ampere meter as shown in Figure 18. b. Select the EZCT-2000A’s Diagnostics mode (see section 5.1). c. Press the [PAPER ∧ Contrast] key to raise the Vx voltage. d.
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REV 1 5.4 EZCT-2000A USER’S MANUAL Quickly Verifying the EZCT-2000A’s Turns Ratio Circuit You can quickly verify the EZCT-2000’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 19. b. Connect the X2 test lead to the H2 test lead as shown in Figure 19. 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.
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EZCT-2000A USER’S MANUAL 5.5 REV 1 Troubleshooting Guide PROBLEM DESCRIPTION Probable Cause Suggested Solution When running the excitation test, the Vx voltage is always zero. The excitation current can be raised during a test. • The EZCT-2000A X cables are driving a • Check CT shorting screws. When running the excitation test, the Vx voltage can be raised but the excitation current is always zero during a test. • The EZCT-2000A X cable is driving an opened circuit.
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REV 1 6.0 EZCT-2000A USER’S MANUAL UPGRADING FIRMWARE The EZCT-2000A’s firmware is user-upgradeable. You can download the latest firmware from the Vanguard Instruments Company web site at http://www.vanguard-instruments.com. Use the steps below to download and install the latest EZCT-2000A firmware: a. Visit the Vanguard web site at http://www.vanguard-instruments.com and click on the “Downloads” button: b.
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EZCT-2000A USER’S MANUAL REV 1 d. You will also receive an email confirming the receipt of your download request. Once your request has been received, you will receive a second email, usually within 1-2 business hours, containing a download link for the firmware file. Click on this link and download the firmware file to your computer. e. The downloaded file will be in ZIP compressed format. Unzip this file to an empty directory (you can use a utility like Winzip, 7Zip, Winrar, etc.).
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REV 1 EZCT-2000A USER’S MANUAL erasing BLoCK 4 loading code from flash drv. When the firmware upgrade has finished, the following screen will be displayed: loading code from flash drv. BOOT LDR R x.xx You will hear a series of beeps as the unit re-boots. Once the unit has re-booted, the “STARTUP” menu will be displayed.
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EZCT-2000A USER’S MANUAL 7.0 REV 1 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 20. Figure 20 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.
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REV 1 EZCT-2000A USER’S MANUAL Figure 21 shows a typical connection of a CT mounted on the primary bushing of a single phase transformer. When the voltage V1 is introduced to the CT's secondary winding, there is an induced voltage (V3) on the primary winding of this single phase transformer.
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EZCT-2000A USER’S MANUAL REV 1 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 22. By shorting out the transformer secondary winding, the user can eliminate most of the V3 voltage (V3=0V).
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REV 1 EZCT-2000A USER’S MANUAL Figure 23 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= ( ) Figure 23 Since there is no secondary winding on the shunt reactor, the turns-ratio measurement from using this method will always have some built-in error.
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EZCT-2000A USER’S MANUAL REV 1 Figure 24 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.
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REV 1 EZCT-2000A USER’S MANUAL 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.
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EZCT-2000A USER’S MANUAL REV 1 Figure 26 Figure 27 98
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1520 S. Hellman Ave • Ontario, CA 91761 • USA Phone: 909-923-9390 • Fax: 909-923-9391 www.vanguard-instruments.com Copyright © 2014 by Vanguard Instruments Company, Inc. EZCT-2000A User’s Manual • Revision 1.