Vanguard Instruments EZCT S2 User Manual
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Vanguard Instruments EZCT S2 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
TM
EZCT S2
USER'S MANUAL
December 2009
Revision 3

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  • Page 1 EZCT S2 DIGITAL CURRENT-TRANSFORMER TESTER USER’S MANUAL Vanguard Instruments Company, Inc. 1520 S. Hellman Ave. Ontario, California 91761, USA TEL: (909) 923-9390 December 2009 FAX: (909) 923-9391 Revision 3...
  • Page 2 SAFETY WARNINGS AND CAUTIONS The EZCT S2 can produce a voltage up to 1,500 Vac that can cause severe injury and/or equipment damage. Due to this reason, the EZCT S2 shall be used only by trained operators.

  • Page 3: Table Of Contents

    Restoring and Printing a Test Record From Flash EEPROM ........22 3.3.2. Printing a Restored Test Record ................25 3.3.3. Printing a Directory of Test Records Stored in the EZCT S2’s Memory ....26 3.3.4. Erasing Test Records From the Flash EEPROM ............28 Working With Test Plans ....................30 3.4.1.
  • Page 4 LIST OF FIGURES Figure 1. EZCT S2 Controls and Indicators ..................5 Figure 2. Typical EZCT S2 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 S2 is indicated as • Menu options are referenced as (MENU OPTION). • Screen and menu names are referenced as “SCREEN/MENU NAME”.

  • Page 6: Introduction

    User Interface and Display The EZCT S2 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

    EZCT S2. This software can be used to retrieve test records from the EZCT S2, create test plans, download test plans to the EZCT S2, and can also be used to run CT tests from the PC. Tabulated test records can be exported in Microsoft® Excel format.

  • Page 8: Technical Specifications

    EZCT S2 USER’S MANUAL REV 3 Technical Specifications Table 1. EZCT S2 Technical Specifications TYPE Portable current transformer test set PHYSICAL SPECIFICATIONS 16.8”W x 12.6”H x 12”D (42.7 cm x 32 cm x 26.9 cm); Weight: 55 lbs (25 kg) INPUT POWER 100 –...

  • Page 9: Ezct S2 Controls And Indicators

    EZCT S2 USER’S MANUAL EZCT S2 Controls and Indicators The EZCT S2’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.

  • Page 10: Table 2. Functional Descriptions Of Ezct S2 Controls And Indicators

    EZCT S2 USER’S MANUAL REV 3 Table 2. Functional Descriptions of EZCT S2 Controls and Indicators Item Panel Markings Functional Description Number Current transformer excitation voltage connector. The EZCT S2’s X output terminal is rated to 1500 Vac working voltage. Any voltage above 1500 Vac will damage the input circuitry.

  • Page 11: Pre-Test Setup

    REV 3 EZCT S2 USER’S MANUAL PRE-TEST SETUP Operating Voltages The EZCT S2’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 S2 features one USB and one RS-232C PC interface port. A Windows-based “Current Transformer Analysis” software application is supplied with the EZCT S2. For further information, please see the software user’s manual.

  • Page 13: Operating Procedures

    OPERATING PROCEDURES EZCT S2 Cable Connections Always connect the EZCT S2 to the substation ground before connecting any test cables. 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.

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

    EZCT S2 USER’S MANUAL REV 3 Figure 3. Bushing CT Connection on Delta Transformer Figure 4. Bushing CT Connection on Y Transformer...

  • Page 15: Performing Tests

    REV 3 EZCT S2 USER’S MANUAL Performing Tests 3.2.1. 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 16 EZCT S2 USER’S MANUAL REV 3 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 17 REV 3 EZCT S2 USER’S MANUAL 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 18: Performing Excitation And Ratio Tests

    The following procedure describes the general steps for performing excitation and ratio tests. a. When the EZCT S2 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 19 REV 3 EZCT S2 USER’S MANUAL e. If the selected test included an excitation test, the following screen will be displayed: SELECT VOLTAGE RANGE 1. 50V 250V 3. 500V 4. 1500V Select the test voltage range by pressing the corresponding key ( f.
  • Page 20 EZCT S2 USER’S MANUAL REV 3 ENTER PLATE RATIO: 80 : 1.0 [ENTER] Press the key. Continue to step h. 2. NO Press the key if you do not want to enter the CT nameplate values. Continue to step h.
  • Page 21 (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 typical graphic report is shown in Figure 6.
  • Page 22 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 S2’s Flash EEPROM. NOTE Press any key to return to the “START-UP” menu.

  • Page 23: Figure 5. Typical Ezct S2 Tabulated Report Printout

    REV 3 EZCT S2 USER’S MANUAL Figure 5. Typical EZCT S2 Tabulated Report Printout...

  • Page 24: Table 3. Descriptions Of Tabulated Test Results Elements

    EZCT S2 USER’S MANUAL REV 3 Table 3. Descriptions of Tabulated Test Results Elements Item Description Number Test record header information. The 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.

  • Page 25: Figure 6. Typical Ezct S2 Graphic Report

    REV 3 EZCT S2 USER’S MANUAL Knee Point Marker Figure 6. Typical EZCT S2 Graphic Report...

  • Page 26: Working With Test Records

    3.3.1. Restoring and Printing a Test Record From Flash EEPROM You can restore a test record from the EZCT S2’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 27 REV 3 EZCT S2 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.
  • Page 28 EZCT S2 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 29: Printing A Restored Test Record

    REV 3 EZCT S2 USER’S MANUAL 3.3.2. Printing a Restored Test Record You can print a test record at the time that it is restored from the Flash EEPROM (see section 3.3.1), 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 30: Printing A Directory Of Test Records Stored In The Ezct S2'S Memory

    REV 3 3.3.3. Printing a Directory of Test Records Stored in the EZCT S2’s Memory You can print a directory of all the test records stored in the EZCT S2’s Flash EEPROM using the steps below: a. Start from the “START-UP” menu: 1.

  • Page 31: Figure 7. Typical Internal Test Record Directory Printout

    REV 3 EZCT S2 USER’S MANUAL Figure 7. Typical Internal Test Record Directory Printout...

  • Page 32: Erasing Test Records From The Flash Eeprom

    EZCT S2 USER’S MANUAL REV 3 3.3.4. Erasing Test Records From the Flash EEPROM You can erase individual or all test records stored in the EZCT S2’s Flash EEPROM. To erase a test record: a. Start from the “START-UP” menu: 1.
  • Page 33 2. ERASE ALL RECORDS Press the key if you would like to erase all of the test records stored in the EZCT S2’s flash EEPROM. The following confirmation screen will be displayed: ERASE ALL RECORDS! ARE YOU SURE? “ENTER” TO CONTINUE...

  • Page 34: 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 S2’s Flash EEPROM. The ability to use test plans makes CT testing an extremely simple process. To perform a test, the EZCT S2 is connected to the CT terminals and a test plan is selected to run.
  • Page 35 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 new test plan. The test plan number will be automatically incremented by the EZCT S2.

  • Page 36: Printing A Directory Of Test Plans Stored In The Ezct S2'S Memory

    REV 3 3.4.2. Printing a Directory of Test Plans Stored in the EZCT S2’s Memory You can print a directory of all the test plans stored in the EZCT S2’s Flash EEPROM using the steps below: a. Start from the “START-UP” menu: 1.

  • Page 37: Figure 8. Typical Ezct S2 Flash Eeprom Test Plan Directory Printout

    REV 3 EZCT S2 USER’S MANUAL Figure 8. Typical EZCT S2 Flash EEPROM Test Plan Directory Printout...

  • Page 38: Printing A Test Plan

    EZCT S2 USER’S MANUAL REV 3 3.4.3. Printing a Test Plan To print a test plan: a. Start from the “START-UP” menu: 1. RUN TEST 12/04/09 2. SETUP 09:15:25 3. TEST PLANS 4. DIAGNOSTIC Press the key (TEST PLANS). b. The following screen will be displayed: 1.

  • Page 39: Table 4. Description Of Test Plan Elements

    REV 3 EZCT S2 USER’S MANUAL Figure 9. 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 40: Erasing Test Plans From The Flash Eeprom

    EZCT S2 USER’S MANUAL REV 3 3.4.4. Erasing Test Plans From the Flash EEPROM To erase one or all test plans from the EZCT S2’s Flash EEPROM: a. Start from the “START-UP” menu: 1. RUN TEST 12/04/09 2. SETUP 09:39:19 3.
  • Page 41 REV 3 EZCT S2 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 3.4.2.

  • Page 42: Loading A Test Plan From The Ezct S2'S Flash Eeprom

    3.4.5. Loading a Test Plan from the EZCT S2’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 S2’s Flash EEPROM into the working memory: a. Start from the “START-UP” menu: 1.

  • Page 43: Running A Test Using A Loaded Test Plan

    HOOK CABLES TO CT: X1 CABLE to CT-X1 X2 CABLE to CT-X2 “ENTER” TO CONTINUE [ENTER] Press the key and the EZCT S2 will start running the test per the test plan settings. The screen will be updated with the test status.
  • Page 44 EZCT S2 USER’S MANUAL REV 3 When the test has finished, the following screen will be displayed: SAVE THIS RECORD? 1.YES 2.NO Press the key (YES) to save the record. The following screen will be displayed momentarily: SAVING RECORD... PLEASE WAIT...
  • Page 45 “START” TO BEGIN [START] Press the key to begin the test. f. The EZCT S2 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 46 EZCT S2 USER’S MANUAL REV 3 Press the key (YES) to save the record. The following screen will be displayed momentarily: SAVING RECORD... PLEASE WAIT... The following confirmation screen will then be displayed: RECORD NUMBER 2 HAS BEEN SAVED! Press any key to return to the “START-UP” menu.

  • Page 47: Unloading A Test Plan From The Working Memory

    REV 3 EZCT S2 USER’S MANUAL 3.4.7. 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 12/04/09 2.

  • Page 48: Changing Setup Parameters

    EZCT S2 USER’S MANUAL REV 3 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 12/04/09 2. SETUP 10:47:17 3.

  • Page 49: Figure 10. Graphic Report Showing Knee Point Marker

    REV 3 EZCT S2 USER’S MANUAL If a test record is loaded in the current working memory, the following screen will be displayed: KNEE TYPE CHANGED NOTE SAVE RECORD? 1. YES 2. NO Press the key (YES) to save the test record with the updated knee point marker setting.

  • Page 50: Selecting The Buried Ct In Transformer Delta Option

    Selecting the Buried CT in Transformer Delta Option The EZCT S2 can be used to measure the turns ratio of a CT buried in the transformer Delta windings (see Figure 11 and Figure 12 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 51: Figure 11. Buried Ct In A Delta Transformer Illustration 1

    REV 3 EZCT S2 USER’S MANUAL The “Buried CT in Delta” option will stay active for all subsequent tests performed. Turning off the EZCT S2 will reset this option. NOTE Figure 11. Buried CT in a Delta Transformer Illustration 1...
  • Page 52 • The CT turns ratio is now measured as Ratio = or Ratio = ). This measured turns ratio is higher than the actual turns ratio. • The EZCT S2 will display the correct CT turns ratio by adjusting the measured turns ratio by...

  • Page 53: Setting The Clock

    REV 3 EZCT S2 USER’S MANUAL Setting the Clock To set the EZCT S2’s internal clock: a. Start from the “START-UP” menu: 1. RUN TEST 12/04/09 2. SETUP 11:11:11 3. TEST PLANS 4. DIAGNOSTIC Press the key (SETUP). b. The following screen will be displayed: 1.

  • Page 54: Diagnostics, Verification, And Troubleshooting

    EZCT S2 USER’S MANUAL REV 3 DIAGNOSTICS, VERIFICATION, AND TROUBLESHOOTING Performing a Diagnostics Test The Diagnostics test mode displays the output voltage at the X leads (V ), the voltage sensed by the H leads (V ), and the X voltage excitation current (I ).

  • Page 55: Verifying The Ezct S2'S

    Verifying the EZCT S2’s V Sense Circuit Using an External Meter The excitation voltage (V ) sensed by the EZCT S2 can be verified using an external RMS volt meter. Follow the steps below to verify the EZCT S2’s V sense circuit: a.

  • Page 56: Verifying The Ezct S2'S I

    You can verify the excitation current (I ) sensed by the EZCT S2 by using an external RMS ampere meter. Follow the steps below to verify the EZCT S2’s I sense circuit: a. Connect the X cables to a power resistor and an RMS ampere meter as shown in Figure b.

  • Page 57: Quickly Verifying The Ezct S2'S Turns Ratio Circuit

    Quickly Verifying the EZCT S2’s Turns Ratio Circuit You can quickly verify the EZCT S2’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 15.

  • Page 58: Troubleshooting Guide

    The excitation current can be raised during a test. When running the • The EZCT S2 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 59 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 S2 User’s Manual • Revision 3.0 • December 4, 2009 • TA...

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