Vanguard EZCT-2000 User Manual
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Vanguard EZCT-2000 User Manual

Digital current-transformer tester
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DIGITAL CURRENT-TRANSFORMER TESTER
Vanguard Instruments Company, Inc.
1520 S. Hellman Ave.
Ontario, California 91761, USA
TEL: (909) 923-9390
FAX: (909) 923-9391
EZCT-2000
USER'S MANUAL
TM
October 2009
Revision 3

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  • Page 1 EZCT-2000 DIGITAL CURRENT-TRANSFORMER TESTER USER’S MANUAL Vanguard Instruments Company, Inc. 1520 S. Hellman Ave. Ontario, California 91761, USA TEL: (909) 923-9390 October 2009 FAX: (909) 923-9391 Revision 3...
  • Page 2 SAFETY WARNINGS AND CAUTIONS The EZCT-2000 can produce a voltage up to 2,000 Vac that can cause severe injury and/or equipment damage. Due to this reason, the EZCT-2000 shall be used only by trained operators.

  • Page 3: Table Of Contents

    Restoring and Printing a Test Record From Flash EEPROM ........24 3.4.2. Printing a Restored Test Record ................27 3.4.3. Printing a Directory of Test Records Stored in the EZCT-2000’s Memory ..... 28 3.4.4. Erasing Test Records From the Flash EEPROM ............30 Working With Test Plans ....................32 3.5.1.
  • Page 4 LIST OF FIGURES Figure 1. EZCT-2000 Controls and Indicators .................. 5 Figure 2. Typical EZCT-2000 Excitation and Ratio Test Cable Connection ........9 Figure 3. Bushing CT Connection on Delta Transformer .............. 10 Figure 4. Bushing CT Connection on Y Transformer ..............10 Figure 5.

  • Page 5: Conventions Used In This Document

    CONVENTIONS USED IN THIS DOCUMENT This document uses the following conventions: [KEY] [SWITCH] • A key or switch on the EZCT-2000 is indicated as • Menu options are referenced as (MENU OPTION). • Screen and menu names are referenced as “SCREEN/MENU NAME”.

  • Page 6: Introduction

    100 micro-ohms to 10 ohms. User Interface and Display The EZCT-2000 features a back-lit LCD screen (4 lines by 20 characters) that is viewable in both bright sunlight and low-light levels. A rugged, alpha-numeric, membrane keypad is used to control the unit.

  • Page 7: Furnished Accessories

    Internal Test Plan Storage Capacity The EZCT-2000 can store up to 128 CT test plans in Flash EEPROM. A test plan defines the excitation test voltage and current range selection, CT nameplate ratio, and CT winding terminals (X1 to X5) for each of the tests.

  • Page 8: Technical Specifications

    EZCT-2000 USER’S MANUAL REV 3 Technical Specifications Table 1. EZCT-2000 Technical Specifications TYPE Portable current-transformer test set 16.8”W x 12.6”H x 14”D (42.7 cm x 32.0 cm x 35.6 cm); Weight: 56 lbs PHYSICAL SPECIFICATIONS (25.4 Kg) INPUT POWER 100 –...

  • Page 9: Ezct-2000 Controls And Indicators

    EZCT-2000 USER’S MANUAL EZCT-2000 Controls and Indicators The EZCT-2000’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-2000.

  • Page 10: Table 2. Functional Descriptions Of Ezct-2000 Controls And Indicators

    Functional Description Number Current transformer excitation voltage connectors. Each set of connectors contains a test voltage connector and sensing connector. The EZCT-2000’s X X1, X2, X3, X4, X5 output terminals are rated to 2000 Vac working voltage. Any voltage above 2000 Vac will damage the input circuitry.

  • Page 11: Pre-Test Setup

    REV 3 EZCT-2000 USER’S MANUAL PRE-TEST SETUP Operating Voltages The EZCT-2000’s operating voltage is preset at the factory for 100-120 Vac, 50/60 Hz or 200-240 Vac, 50/60 Hz. LCD Screen Contrast Control [PAPER ∧ Contrast] To increase the LCD screen contrast, press and hold the key for two seconds.
  • Page 12 The thermal paper will show a red stripe to indicate that the roll is about to run out of paper. Computer Interface Ports The EZCT-2000 features one USB and one RS-232C PC interface port. A Windows-based “Current Transformer Analysis” software application is supplied with the EZCT-2000. For further information, please see the software user’s manual.

  • Page 13: Operating Procedures

    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.

  • Page 14: Figure 3. Bushing Ct Connection On Delta Transformer

    EZCT-2000 USER’S MANUAL REV 3 Figure 3. Bushing CT Connection on Delta Transformer Figure 4. Bushing CT Connection on Y Transformer...

  • Page 15: Ezct-2000 X Input Voltage Warning

    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 voltage across the X1-X2 terminals increases above 250 Vac.

  • Page 16: Performing Tests

    EZCT-2000 USER’S MANUAL REV 3 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.
  • Page 17 REV 3 EZCT-2000 USER’S MANUAL d. The following screen will be displayed: STATION: ↑/↓ TO POSITION “ENTER” TO ACCEPT [ENTER] Type the station name using the alpha-numeric keypad and then press the key. e. The following screen will be displayed: CIRCUIT: ↑/↓...
  • Page 18 EZCT-2000 USER’S MANUAL REV 3 i. The following screen will be displayed: COMMENTS: ↑/↓ TO POSITION “ENTER” TO ACCEPT Enter any relevant comments using the alpha-numeric keypad and then press the [ENTER] key. j. The following screen will be displayed: OPERATOR: ↑/↓...

  • Page 19: Performing Resistance, Excitation, And Ratio Tests

    The following procedure describes the general steps for performing excitation, resistance, and ratio tests. a. When the EZCT-2000 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.
  • Page 20 EZCT-2000 USER’S MANUAL REV 3 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 ( Most CT’s will saturate before the excitation current reaches 1A.
  • Page 21 REV 3 EZCT-2000 USER’S MANUAL 2. NO Press the 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.
  • Page 22 EZCT-2000 USER’S MANUAL REV 3 j. The following screen will be displayed: ENTER COS ϕ: (0.00 – 1.00) Type the Cos ϕ value using the keypad and then press the [ENTER] key. k. The following screen will be displayed: RATED SECONDARY CUR: 1.
  • Page 23 (YES) if you would like to print the test results. The test results will be printed 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.
  • Page 24 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-2000’s Flash EEPROM. NOTE Press any key to return to the “START-UP” menu.

  • Page 25: Figure 6. Typical Ezct-2000 Tabulated Report Printout

    REV 3 EZCT-2000 USER’S MANUAL Figure 6. Typical EZCT-2000 Tabulated Report Printout...

  • Page 26: Table 3. Descriptions Of Tabulated Test Results Elements

    Number Test record header information. The EZCT-2000 X terminals (taps) that were selected for this test. Test note for this particular test. The test note can be up to 20-characters long. Recorded excitation current readings on the CT secondary winding.

  • Page 27: Figure 7. Typical Ezct-2000 Graphic Report

    REV 3 EZCT-2000 USER’S MANUAL Knee Point Marker Figure 7. Typical EZCT-2000 Graphic Report Figure 8. Typical EZCT-2000 Graphic Report with Multiple Plot Curves...

  • Page 28: 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-2000’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.
  • Page 29 REV 3 EZCT-2000 USER’S MANUAL If you do not want to print the test record, press the key (NO). The test record will be restored to the working memory, and you will be returned to the “START- UP” menu. If you would like to print the test record, press the key (YES).
  • Page 30 EZCT-2000 USER’S MANUAL REV 3 d. The following screen will be displayed: PRINT OPTIONS: 1. FULL DATA 2. ABBREVIATED DATA Press the key to print the tabulated data and graphics results on the thermal printer. 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”...

  • Page 31: Printing A Restored Test Record

    REV 3 EZCT-2000 USER’S MANUAL 3.4.2. 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.

  • Page 32: Printing A Directory Of Test Records Stored In The Ezct-2000'S Memory

    REV 3 3.4.3. Printing a Directory of Test Records Stored in the EZCT-2000’s Memory You can print a directory of all the test records stored in the EZCT-2000’s Flash EEPROM using the steps below: a. Start from the “START-UP” menu: 1.

  • Page 33: Figure 9. Typical Internal Test Record Directory Printout

    REV 3 EZCT-2000 USER’S MANUAL Figure 9. Typical Internal Test Record Directory Printout...

  • Page 34: Erasing Test Records From The Flash Eeprom

    EZCT-2000 USER’S MANUAL REV 3 3.4.4. Erasing Test Records From the Flash EEPROM You can erase individual or all test records stored in the EZCT-2000’s Flash EEPROM. To erase a test record: a. Start from the “START-UP” menu: 1. RUN TEST 09/24/09 2.
  • Page 35 2. ERASE ALL RECORDS Press the key if you would like to erase all of the test records stored in the EZCT-2000’s flash EEPROM. The following confirmation screen will be displayed: ERASE ALL RECORDS! ARE YOU SURE? “ENTER” TO CONTINUE...

  • Page 36: Working With Test Plans

    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-2000’s Flash EEPROM. The ability to use test plans makes CT testing an extremely simple process. To perform a test, the EZCT-2000 is connected to the CT terminals and a test plan is selected to run.
  • Page 37 HAS BEEN SAVED! 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.

  • Page 38: Printing A Directory Of Test Plans Stored In The Ezct-2000'S Memory

    REV 3 3.5.2. Printing a Directory of Test Plans Stored in the EZCT-2000’s Memory You can print a directory of all the test plans stored in the EZCT-2000’s Flash EEPROM using the steps below: a. Start from the “START-UP” menu: 1.

  • Page 39: Figure 10. Typical Ezct-2000 Flash Eeprom Test Plan Directory Printout

    REV 3 EZCT-2000 USER’S MANUAL Figure 10. Typical EZCT-2000 Flash EEPROM Test Plan Directory Printout...

  • Page 40: Printing A Test Plan

    EZCT-2000 USER’S MANUAL REV 3 3.5.3. Printing a Test Plan To print a test plan: a. Start from the “START-UP” menu: 1. RUN TEST 09/24/09 2. SETUP 08:20:19 3. TEST PLANS 4. DIAGNOSTIC Press the key (TEST PLANS). b. The following screen will be displayed: 1.

  • Page 41: Table 4. Description Of Test Plan Elements

    REV 3 EZCT-2000 USER’S MANUAL Figure 11. Typical Test Plan Printout Table 4. Description of Test Plan Elements Item Description Number Number of tests in test plan (2) Tests to be performed (Excitation and Turns Ratio) Terminals used for excitation test (X2-X3) Maximum excitation voltage (300 V) Maximum excitation current (2.0 A)

  • Page 42: Erasing Test Plans From The Flash Eeprom

    EZCT-2000 USER’S MANUAL REV 3 3.5.4. Erasing Test Plans From the Flash EEPROM To erase one or all test plans from the EZCT-2000’s Flash EEPROM: a. Start from the “START-UP” menu: 1. RUN TEST 09/24/09 2. SETUP 08:20:19 3. TEST PLANS 4.
  • Page 43 REV 3 EZCT-2000 USER’S MANUAL • 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 3.5.2. NOTES...

  • Page 44: Loading A Test Plan From The Ezct-2000'S Flash Eeprom

    3.5.5. Loading a Test Plan from the EZCT-2000’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-2000’s Flash EEPROM into the working memory: a. Start from the “START-UP” menu: 1.

  • Page 45: Running A Test Using A Loaded Test Plan

    “START” TO BEGIN [START] Press the 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: SAVE THIS RECORD? 1.YES...
  • Page 46 “START” TO BEGIN [START] Press the 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: ANY KEY TO CONTINUE Vx=77.6 Vh=0.3876...
  • Page 47 REV 3 EZCT-2000 USER’S MANUAL f. The following screen will be displayed: PRINT TEST RESULTS? 1.YES 2.NO Press the key (YES) if you would like to print the test results. Press the key (NO) if you do not want to print the test results.

  • Page 48: Unloading A Test Plan From The Working Memory

    EZCT-2000 USER’S MANUAL REV 3 3.5.7. 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. RUN TEST 09/24/09 2.

  • Page 49: Changing Setup Parameters

    REV 3 EZCT-2000 USER’S MANUAL CHANGING SETUP PARAMETERS Setting the Knee Point Marker Use the steps below to change the knee point marker for the excitation graph: a. Start from the “START-UP” menu: 1. RUN TEST 09/24/09 2. SETUP 08:20:19 3.

  • Page 50: Figure 12. Graphic Report Showing Knee Point Marker

    EZCT-2000 USER’S MANUAL REV 3 Knee Point Marker Knee Point Marker Type Figure 12. Graphic Report Showing Knee Point Marker...

  • Page 51: Selecting The Buried Ct In Transformer Delta Option

    Selecting the Buried CT in Transformer Delta Option The EZCT-2000 can be used to measure the turns ratio of a CT buried in the transformer Delta windings (see Figure 13 and Figure 14 for further information). However, in order for the unit to correctly calculate the turns ratio of a CT buried in the transformer Delta windings, the “CT...

  • Page 52: Figure 13. Buried Ct In A Delta Transformer Illustration 1

    EZCT-2000 USER’S MANUAL REV 3 The “Buried CT in Delta” option will stay active for all subsequent tests performed. Turning off the EZCT-2000 will reset this option. NOTE Figure 13. Buried CT in a Delta Transformer Illustration 1 Figure 14. Buried CT in a Delta Transformer Illustration 2...
  • Page 53 • The CT turns ratio is now measured as Ratio = or Ratio = ). This measured turns ratio is higher than the actual turns ratio. • The EZCT-2000 will display the correct CT turns ratio by adjusting the measured turns ratio by...

  • Page 54: Setting The Clock

    EZCT-2000 USER’S MANUAL REV 3 Setting the Clock To set the EZCT-2000’s internal clock: a. Start from the “START-UP” menu: 1. RUN TEST 09/24/09 2. SETUP 08:20:19 3. TEST PLANS 4. DIAGNOSTIC Press the key (SETUP). b. The following screen will be displayed: 1.

  • Page 55: Diagnostics, Verification, And Troubleshooting

    REV 3 EZCT-2000 USER’S MANUAL DIAGNOSTICS, VERIFICATION, AND TROUBLESHOOTING Performing a Diagnostics Test The Diagnostics test mode displays the output voltage at the selected X leads (V ), the voltage sensed by the H leads (V ), and the X voltage excitation current (I ).
  • Page 56 EZCT-2000 USER’S MANUAL REV 3 DIAGNOSTIC Vx = 2.2 Ix = 0.001A Vh = 0.07 ↑/↓ - “STOP” TO EXIT [PAPER ∧ Contrast] [PAPER ∨ Contrast] You can press the key to increase or [STOP] decrease the V voltage, respectively. You can press the key to end the test immediately and return to the “START-UP”...

  • Page 57: Verifying The Ezct-2000'S

    Verifying the EZCT-2000’s V Sense Circuit Using an External Meter The excitation voltage (V ) sensed by the EZCT-2000 can be verified using an external RMS volt meter. Follow the steps below to verify the EZCT-2000’s V sense circuit: a. Connect the X cables to an RMS volt meter as shown in Figure 15.

  • Page 58: Verifying The Ezct-2000'S I

    You can verify the excitation current (I ) sensed by the EZCT-2000 by using an external RMS ampere meter. Follow the steps below to verify the EZCT-2000’s I sense circuit: a. Connect the X cables to a power resistor and an RMS ampere meter as shown in Figure b.

  • Page 59: Quickly Verifying The Ezct-2000'S Turns Ratio Circuit

    EZCT-2000 USER’S MANUAL Quickly Verifying the EZCT-2000’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 17.

  • Page 60: Troubleshooting Guide

    The excitation current can be raised during a test. When running the • The EZCT-2000 X cable is driving an • Check the CT terminal connection. excitation test, the V opened circuit. voltage can be raised but the excitation current is always zero during a test.
  • Page 61 1520 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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