Vanguard Instruments EZCT S2A User Manual
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Vanguard Instruments EZCT S2A 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 S2A
USER'S MANUAL
TM
February 2010
Revision 1

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  • Page 1 EZCT S2A DIGITAL CURRENT-TRANSFORMER TESTER USER’S MANUAL Vanguard Instruments Company, Inc. 1520 S. Hellman Ave. Ontario, California 91761, USA TEL: (909) 923-9390 February 2010 FAX: (909) 923-9391 Revision 1...
  • Page 2 SAFETY WARNINGS AND CAUTIONS The EZCT S2A can produce a voltage up to 1,500 Vac that can cause severe injury and/or equipment damage. Due to this reason, the EZCT S2A shall be used only by trained operators.

  • Page 3: Table Of Contents

    Restoring and Printing a Test Record From a USB Flash Drive ......29 3.3.3. Printing a Restored Test Record ................32 3.3.4. Printing a Directory of Test Records Stored in the EZCT S2A’s Memory ....34 3.3.5. Erasing Test Records From the Flash EEPROM ............37 3.3.6.
  • Page 4 LIST OF FIGURES Figure 1. EZCT S2A Controls and Indicators ..................5 Figure 2. Typical EZCT S2A 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 S2A 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 S2A features a back-lit LCD screen (240 x 128 dot graphic) 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 S2A can store up to 128 CT test plans in Flash EEPROM. A test plan defines the excitation test voltage and current selection, CT nameplate ratio, and CT winding terminal connection instructions for each test.

  • Page 8: Technical Specifications

    EZCT S2A USER’S MANUAL REV 1 Technical Specifications Table 1. EZCT S2A 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 S2A Controls And Indicators

    EZCT S2A USER’S MANUAL EZCT S2A Controls and Indicators The EZCT S2A’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 S2A Controls And Indicators

    EZCT S2A USER’S MANUAL REV 1 Table 2. Functional Descriptions of EZCT S2A Controls and Indicators Item Panel Markings Functional Description Number Current transformer excitation voltage connector. The EZCT S2A’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 1 EZCT S2A USER’S MANUAL PRE-TEST SETUP Operating Voltages The EZCT S2A’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 S2A features one USB and one RS-232C PC interface port. A Windows-based “Current Transformer Analysis” software application is supplied with the EZCT S2A. For further information, please see the Software User’s Manual.

  • Page 13: Operating Procedures

    OPERATING PROCEDURES EZCT S2A Cable Connections Always connect the EZCT S2A 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 S2A USER’S MANUAL REV 1 Figure 3. Bushing CT Connection on Delta Transformer Figure 4. Bushing CT Connection on Y Transformer...

  • Page 15: Performing Tests

    REV 1 EZCT S2A 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 S2A USER’S MANUAL REV 1 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:...
  • Page 17 REV 1 EZCT S2A USER’S MANUAL h. The following screen will be displayed: SERIAL NUMBER: ↑↓ TO POSITION "enter" to accept [ENTER] Type the serial number using the alpha-numeric keypad and then press the key. i. The following screen will be displayed:...

  • Page 18: Performing Excitation And Ratio Tests

    The following procedure describes the general steps for performing excitation and ratio tests. a. When the EZCT S2A 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 1 EZCT S2A USER’S MANUAL The cable connection information displayed depends on your selection in step NOTE [ENTER] Press the key to continue. e. If the selected test included an excitation test, the following screen will be displayed: SELECT VOLTAGE RANGE: 1.
  • Page 20 EZCT S2A USER’S MANUAL REV 1 ENTER PLATE RATIO: Type the first number using the keypad. [CLEAR] You can press the key to restart a field entry if necessary. [ENTER] Press the key. The following screen will be displayed: ENTER PLATE RATIO: 80 : 0.0...
  • Page 21 REV 1 EZCT S2A USER’S MANUAL When pressing a key, the corresponding number on the key will be displayed first. Pressing the key again will display the first letter on the key. Pressing the key again will display the second letter on the key. For example, to type the letter “A”, you must press [CLEAR] key twice.
  • Page 22 (YES) if you would like to print the test results. The test results will be printed on the thermal printer. A typical EZCT S2A tabulated test report printout is shown in Figure 5. A typical graphic report is shown in Figure 6.
  • Page 23 REV 1 EZCT S2A USER’S MANUAL n. The following screen will be displayed: TEST 1 SAVED Press any key to continue. o. The following screen will be displayed: RUN ANOTHER TEST? 1. YES 2. NO Press the key (NO). p. The following screen will be displayed: SAVE THIS RECORD? 1.
  • 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 S2A’s Flash EEPROM. NOTE Press any key to return to the “START-UP” menu.

  • Page 25: Figure 5. Typical Ezct S2A Tabulated Report Printout

    REV 1 EZCT S2A USER’S MANUAL Figure 5. Typical EZCT S2A Tabulated Report Printout...

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

    EZCT S2A USER’S MANUAL REV 1 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 27: Figure 6. Typical Ezct S2A Graphic Report

    REV 1 EZCT S2A USER’S MANUAL Knee Point Marker Figure 6. Typical EZCT S2A Graphic Report...

  • Page 28: 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 S2A’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 1 EZCT S2A USER’S MANUAL 1. INTERNAL STORAGE 2. THUMB DRIVE Press the 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. ENTER RECORD NUMBER If you know the record number that you would like to restore, press the key.
  • Page 30 EZCT S2A USER’S MANUAL REV 1 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 key (NO). The test record will be restored to the working memory, and you will be returned to the “START- UP”...
  • Page 31 REV 1 EZCT S2A USER’S MANUAL SCROLL TO SELECT Press the key if you would like to scroll through a directory of the stored test records. The following screen will be displayed: RECORD DIRECTORY "UP" TO SCROLL FWD "DWN" TO SCROLL RVS [PAPER ∧...
  • Page 32 EZCT S2A USER’S MANUAL REV 1 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 key (NO). The test record will be restored to the working memory, and you will be returned to the “START- UP”...

  • Page 33: Restoring And Printing A Test Record From A Usb Flash Drive

    EZCT S2A USER’S MANUAL 3.3.2. 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 S2A’s working memory using the steps below: a. Make sure the USB Flash drive containing the test record(s) is inserted in the EZCT S2A’s USB Flash drive port (“USB MEM”...
  • Page 34 EZCT S2A USER’S MANUAL REV 1 e. The following screen will be displayed: RESTORE THUMB DRIVE REC_ [ENTER] Type the record number that you would like to restore and press the key. If you do not know the record number, you can print a test record directory. Please see section 3.3.4 for details...
  • Page 35 REV 1 EZCT S2A USER’S MANUAL h. The following screen will be displayed: PRINT OPTIONS: 1. FULL DATA 2. ABBREVIATED data Press the 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.

  • Page 36: Printing A Restored Test Record

    EZCT S2A USER’S MANUAL REV 1 3.3.3. Printing a Restored Test Record You can print a test record at the time that it is restored from the Flash EEPROM (see section 3.3.1), 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 37 REV 1 EZCT S2A USER’S MANUAL Press the 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.

  • Page 38: Printing A Directory Of Test Records Stored In The Ezct S2A's Memory

    REV 1 3.3.4. Printing a Directory of Test Records Stored in the EZCT S2A’s Memory You can print a directory of all the test records stored in the EZCT S2A’s Flash EEPROM using the steps below: a. Start from the “START-UP” menu: 1.
  • Page 39 The short directory option prints the last 10 records stored in the EZCT S2A’s Flash EEPROM. The short directory listing will be printed on the thermal printer and you will be returned to...

  • Page 40: Figure 7. Typical Internal Test Record Directory Printout

    EZCT S2A USER’S MANUAL REV 1 Figure 7. Typical Internal Test Record Directory Printout...

  • Page 41: Erasing Test Records From The Flash Eeprom

    REV 1 EZCT S2A USER’S MANUAL 3.3.5. Erasing Test Records From the Flash EEPROM You can erase individual or all test records stored in the EZCT S2A’s Flash EEPROM. To erase a test record: a. Start from the “START-UP” menu: 1.
  • Page 42 EZCT S2A USER’S MANUAL REV 1 ERASE RECORD 1. ERASE SINGLE REC. 2. ERASE ALL RECORDS Continue with the steps below: 1. ERASE SINGLE REC. Press the key (ERASE SINGLE REC.) if you would like to erase a single record.
  • Page 43 2. ERASE ALL RECORDS Press the key if you would like to erase all of the test records stored in the EZCT S2A’s flash EEPROM. The following confirmation screen will be displayed: ERASE ALL RECORDS! Are you sure? "ENTER" TO CONTINUE.

  • Page 44: 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 S2A’s USB Flash drive port (“USB MEM” port). Then start from the “START-UP” menu: 1.
  • Page 45 REV 1 EZCT S2A USER’S MANUAL 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 key (ERASE SINGLE REC.) if you would like to erase a single record.
  • Page 46 EZCT S2A USER’S MANUAL REV 1 [STOP] You can continue to erase additional records or press the key to exit to the “START-UP” menu. 2. ERASE ALL RECORDS Press the key (ERASE ALL RECORDS) if you would like to erase all of the test records stored in the USB Flash drive.

  • Page 47: 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 S2A’s Flash EEPROM. The ability to use test plans makes CT testing an extremely simple process. To perform a test, the EZCT S2A is connected to the CT terminals and a test plan is selected to run.
  • Page 48 The test plan will be extracted from the test record in the working memory and will be saved to the EZCT S2A’s Flash EEPROM as a new test plan. The test plan number will be automatically incremented by the EZCT S2A.

  • Page 49: Printing A Directory Of Test Plans Stored In The Ezct S2A's Memory

    EZCT S2A USER’S MANUAL 3.4.2. Printing a Directory of Test Plans Stored in the EZCT S2A’s Memory You can print a directory of all the test plans stored in the EZCT S2A’s Flash EEPROM using the steps below: a. Start from the “START-UP” menu: 1.

  • Page 50: Figure 8. Typical Ezct S2A Flash Eeprom Test Plan Directory Printout

    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 8 below. Figure 8. Typical EZCT S2A Flash EEPROM Test Plan Directory Printout...

  • Page 51: 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 S2A’s Flash drive port (“USB MEM” port). Then start from the “START-UP” menu: 1.

  • Page 52: Figure 9. Typical Usb Flash Drive Test Plan Directory Printout

    EZCT S2A USER’S MANUAL REV 1 Figure 9. Typical USB Flash Drive Test Plan Directory Printout...

  • Page 53: Printing A Test Plan

    REV 1 EZCT S2A USER’S MANUAL 3.4.4. Printing a Test Plan To print a test plan: a. Start from the “START-UP” menu: 1. RUN TEST 02/16/10 2. SETUP 10:24:25 3. TEST PLANS 4. DIAGNOSTIC Press the key (TEST PLANS). b. The following screen will be displayed: 1.

  • Page 54: Table 4. Description Of Test Plan Elements

    EZCT S2A USER’S MANUAL REV 1 Figure 10. 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 55: Erasing Test Plans From The Flash Eeprom

    2. ERASE ALL PLANS The above screen will be displayed only if a USB Flash drive is NOT connected to the EZCT S2A’s USB Flash drive port. If a USB Flash drive is connected, the following screen will be displayed: NOTE 1.
  • Page 56 EZCT S2A USER’S MANUAL REV 1 ERASE TEST PLAN 1. ERASE SINGLE PLAN 2. ERASE ALL PLANS Continue with the steps below: 1. ERASE SINGLE PLAN Press the key if you would like to erase a single test plan. The following...
  • Page 57 REV 1 EZCT S2A USER’S MANUAL ERASE ALL PLANS! Are you sure? "ENTER" TO CONTINUE. [STOP] If you would like to cancel the erasure process, press the key. No test plans will be erased and you will be returned to the “START-UP” menu.

  • Page 58: Erasing Test Plans From A Usb Flash Drive

    3.4.6. 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 S2A’s USB Flash drive port (“USB MEM” port). Then start from the “START-UP” menu: 1.
  • Page 59 REV 1 EZCT S2A USER’S MANUAL 1. ERASE SINGLE PLAN Press the 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_...
  • Page 60 EZCT S2A USER’S MANUAL REV 1 ERASING all thumb drive test plans PLEASE WAIT... The following screen will be displayed after all 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”.

  • Page 61: Loading A Test Plan From The Ezct S2A's Flash Eeprom

    LOAD TEST PLAN NUMBER: The above screen will be displayed only if a USB Flash drive is NOT connected to the EZCT S2A’s USB Flash drive port. If a USB Flash drive is connected, the following screen will be displayed: NOTE 1.
  • Page 62 EZCT S2A USER’S MANUAL REV 1 LOAD TEST PLAN NUMBER: Continue with the steps below: [ENTER] Type the test plan number that you would like to load and press the key. 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 63: Loading A Test Plan From A Usb Flash Drive

    3.4.8. 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 S2A’s USB Flash drive port (“USB MEM” port). Then start from the “START-UP” menu: 1.
  • Page 64 EZCT S2A’s Flash EEPROM. Any existing test plans in the EZCT S2A’s Flash EEPROM will not be over-written. The EZCT S2A will automatically assign a new test plan number and store the test plan in the next available memory location.

  • Page 65: Running A Test Using A Loaded Test Plan

    REV 1 EZCT S2A USER’S MANUAL 3.4.9. Running a Test Using a Loaded Test Plan Once a test plan has been loaded into the working memory (see sections 3.4.7 and 3.4.8 for directions), it can be used to run a test. To run a test using a loaded test plan: a.
  • Page 66 "ENTER" TO CONTINUE [ENTER] Press the key and the EZCT S2A 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.
  • Page 67 "START" to begin [START] Press the key to begin the test. f. The EZCT S2A 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 =77.6 =0.3876...
  • Page 68 EZCT S2A USER’S MANUAL REV 1 g. 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 69 REV 1 EZCT S2A USER’S MANUAL 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 70: Unloading A Test Plan From The Working Memory

    EZCT S2A USER’S MANUAL REV 1 3.4.10. 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. RUN TEST 02/16/10 2.

  • Page 71: Changing Setup Parameters

    REV 1 EZCT S2A 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 02/16/10 2. SETUP 10:24:25 3.
  • Page 72 EZCT S2A USER’S MANUAL REV 1 d. The following screen will be displayed: 1. IEEE 30 DEGREE 2. IEEE 45 DEGREE 3. IEC 10%V-->50%I Press either the key (IEEE 30 DEGREE), the key (IEEE 45 DEGREE), or the (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”...

  • Page 73: Figure 11. Graphic Report Showing Knee Point Marker

    REV 1 EZCT S2A USER’S MANUAL Knee Point Marker Knee Point Marker Type Figure 11. Graphic Report Showing Knee Point Marker...

  • Page 74: Enabling And Disabling The Buried Ct In Transformer Delta Option

    EZCT S2A USER’S MANUAL 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 12 and Figure 13 for further information), you must first enable the “Buried CT in Delta”...

  • Page 75: Disabling The Buried Ct In Transformer Delta Option

    REV 1 EZCT S2A 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 key (YES). f. The following screen will be displayed: -buried ct in delta- ratios adjusted by two-thirds.
  • Page 76 EZCT S2A USER’S MANUAL REV 1 c. The following screen will be displayed: 1. SET TIME 2. buried ct in delta 3. knee point marker 4. print raw data Press the key (BURIED CT IN DELTA). d. The following screen will be displayed: 1.

  • Page 77: Figure 12. Buried Ct In A Delta Transformer Illustration 1

    REV 1 EZCT S2A USER’S MANUAL Figure 12. Buried CT in a Delta Transformer Illustration 1 Figure 13. Buried CT in a Delta Transformer Illustration 2...
  • Page 78 • The CT turns ratio is now measured as Ratio = or Ratio = ). This measured turns ratio is higher than the actual turns ratio. • The EZCT S2A will display the correct CT turns ratio by adjusting the measured turns ratio by...

  • Page 79: Setting The Clock

    REV 1 EZCT S2A USER’S MANUAL Setting the Clock To set the EZCT S2A’s internal clock: a. Start from the “START-UP” menu: 1. RUN TEST 02/16/10 2. SETUP 10:24:25 3. TEST PLANS 4. DIAGNOSTIC Press the key (SETUP). b. The following screen will be displayed: 1.

  • Page 80: Printing Raw Memory Buffer Data

    Printing Raw Memory Buffer Data You can print the raw data from the EZCT S2A’s memory buffer for diagnostic purposes. This will print a table of current and voltage values from the last test performed as well as all stored test records.

  • Page 81: Figure 14. Sample Raw Data Printout

    REV 1 EZCT S2A USER’S MANUAL Figure 14. Sample Raw Data Printout...

  • Page 82: Diagnostics, Verification, And Troubleshooting

    EZCT S2A USER’S MANUAL REV 1 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 83 REV 1 EZCT S2A USER’S MANUAL d. The following screen will be displayed and the V , and I values will be continuously updated for 15 seconds: DIAGNOSTIC = 2.2 = 0.07 = 0.001A ↑↓ - "STOP" to exit [PAPER ∧ Contrast] [PAPER ∨...

  • Page 84: Verifying The Ezct S2A's

    Verifying the EZCT S2A’s V Sense Circuit Using an External Meter The excitation voltage (V ) sensed by the EZCT S2A can be verified using an external RMS volt meter. Follow the steps below to verify the EZCT S2A’s V sense circuit: a.

  • Page 85: Verifying The Ezct S2A's I

    You can verify the excitation current (I ) sensed by the EZCT S2A by using an external RMS ampere meter. Follow the steps below to verify the EZCT S2A’s I sense circuit: a. Connect the X cables to a power resistor and an RMS ampere meter as shown in Figure b.

  • Page 86: Quickly Verifying The Ezct S2A's Turns Ratio Circuit

    Quickly Verifying the EZCT S2A’s Turns Ratio Circuit You can quickly verify the EZCT S2A’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 87: Troubleshooting Guide

    The excitation current can be raised during a test. When running the • The EZCT S2A 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 88: Upgrading Firmware

    EZCT S2A USER’S MANUAL REV 1 UPGRADING FIRMWARE The EZCT S2A’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 S2A firmware: a.
  • Page 89 EZCTS2AM.hex. Copy this file to the root of a USB Flash drive. f. Make sure the EZCT S2A’s power if OFF, and then insert the USB Flash drive containing the firmware file in the EZCT S2A’s Flash drive interface port (“USB MEM” port).
  • Page 90 EZCT S2A USER’S MANUAL REV 1 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 “START-...
  • Page 91 1520 S. Hellman Ave • Ontario, CA 91761 • USA Phone: 909-923-9390 • Fax: 909-923-9391 www.vanguard-instruments.com Copyright © 2010 by Vanguard Instruments Company, Inc. EZCT S2A User’s Manual • Revision 1.0 • February 26, 2010 • TA...

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