Vanguard EZCT-S2A User Manual

EZCT S2ATMDIGITAL CURRENT-TRANSFORMER TESTER USER’S MANUAL Vanguard Instruments Company, Inc.1520 S. Hellman Ave. Ontario, California 91761,

EZCT S2A USER’S MANUAL REV 1 6 Table 2. Functional Descriptions of EZCT S2A Controls and Indicators Item Number Panel Markings Functional Descripti

REV 1 EZCT S2A USER’S MANUAL 7 2.0 PRE-TEST SETUP 2.1 Operating Voltages The EZCT S2A’s operating voltage is preset at the factory for 100-120

EZCT S2A USER’S MANUAL REV 1 8 2.5 Replacing the Thermal Printer Paper The roll of thermal paper is housed inside a dispenser underneath the printe

REV 1 EZCT S2A USER’S MANUAL 9 3.0 OPERATING PROCEDURES 3.1 EZCT S2A Cable Connections Always connect the EZCT S2A to the substation ground be

EZCT S2A USER’S MANUAL REV 1 10 Figure 3. Bushing CT Connection on Delta Transformer Figure 4. Bushing CT Connection on Y Transformer

REV 1 EZCT S2A USER’S MANUAL 11 3.2 Performing Tests 3.2.1. Entering Test Record Header Information You can enter the test record header infor

EZCT S2A USER’S MANUAL REV 1 12 d. The following screen will be displayed: Type the station name using the alpha-numeric keypad and then press the

REV 1 EZCT S2A USER’S MANUAL 13 h. The following screen will be displayed: Type the serial number using the alpha-numeric keypad and then pres

EZCT S2A USER’S MANUAL REV 1 14 3.2.2. Performing Excitation and Ratio Tests The following procedure describes the general steps for performing exc

REV 1 EZCT S2A USER’S MANUAL 15 NOTE The cable connection information displayed depends on your selection in step c. Press the [ENTER] key to c

EZCT S2A USER’S MANUAL REV 1 i SAFETY SUMMARY FOLLOW EXACT OPERATING PROCEDURES Any deviation from the procedures described in this User’s Manual

EZCT S2A USER’S MANUAL REV 1 16 Type the first number using the keypad. You can press the [CLEAR] key to restart a field entry if necessary. Press

REV 1 EZCT S2A USER’S MANUAL 17 When pressing a key, the corresponding number on the key will be displayed first. Pressing the key again will di

EZCT S2A USER’S MANUAL REV 1 18 When the testing is finished, the final results graph will be displayed: Press any key on the keypad to continue. l

REV 1 EZCT S2A USER’S MANUAL 19 n. The following screen will be displayed: Press any key to continue. o. The following screen will be display

EZCT S2A USER’S MANUAL REV 1 20 q. The following confirmation screen will then be displayed: NOTE The test record number is automatically assigne

REV 1 EZCT S2A USER’S MANUAL 21 Figure 5. Typical EZCT S2A Tabulated Report Printout

EZCT S2A USER’S MANUAL REV 1 22 Table 3. Descriptions of Tabulated Test Results Elements Item Number Description 1 Test record header information. 2

REV 1 EZCT S2A USER’S MANUAL 23 Figure 6. Typical EZCT S2A Graphic Report Knee Point Marker

EZCT S2A USER’S MANUAL REV 1 24 3.3 Working With Test Records 3.3.1. Restoring and Printing a Test Record From Flash EEPROM You can restore a test

REV 1 EZCT S2A USER’S MANUAL 25 Press the [1] key (INTERNAL STORAGE). The following screen will then be displayed: Continue with the steps bel

REV 1 EZCT S2A USER’S MANUAL ii TABLE OF CONTENTS CONVENTIONS USED IN THIS DOCUMENT ...

EZCT S2A USER’S MANUAL REV 1 26 The following screen will be displayed: If you do not want to print the test record, press the [2] key (NO). The te

REV 1 EZCT S2A USER’S MANUAL 27 2. SCROLL TO SELECT Press the [2] key if you would like to scroll through a directory of the stored test record

EZCT S2A USER’S MANUAL REV 1 28 The following screen will be displayed: If you do not want to print the test record, press the [2] key (NO). The te

REV 1 EZCT S2A USER’S MANUAL 29 3.3.2. Restoring and Printing a Test Record From a USB Flash Drive You can restore a test record from a USB Fla

EZCT S2A USER’S MANUAL REV 1 30 e. The following screen will be displayed: Type the record number that you would like to restore and press the [EN

REV 1 EZCT S2A USER’S MANUAL 31 h. The following screen will be displayed: Press the [1] key to print the full tabulated data and graphics res

EZCT S2A USER’S MANUAL REV 1 32 3.3.3. Printing a Restored Test Record You can print a test record at the time that it is restored from the Flash E

REV 1 EZCT S2A USER’S MANUAL 33 Press the [1] key to print the tabulated data and graphics results on the thermal printer. The test record will

EZCT S2A USER’S MANUAL REV 1 34 3.3.4. Printing a Directory of Test Records Stored in the EZCT S2A’s Memory You can print a directory of all the te

REV 1 EZCT S2A USER’S MANUAL 35 Continue with the steps below: Press the [1] key to print a full directory listing of all the test records sto

EZCT S2A USER’S MANUAL REV 1 iii 5.1 Performing a Diagnostics Test ...

EZCT S2A USER’S MANUAL REV 1 36 Figure 7. Typical Internal Test Record Directory Printout

REV 1 EZCT S2A USER’S MANUAL 37 3.3.5. Erasing Test Records From the Flash EEPROM You can erase individual or all test records stored in the EZ

EZCT S2A USER’S MANUAL REV 1 38 Continue with the steps below: 1. ERASE SINGLE REC. Press the [1] key (ERASE SINGLE REC.) if you would like to er

REV 1 EZCT S2A USER’S MANUAL 39 2. ERASE ALL RECORDS Press the [2] key if you would like to erase all of the test records stored in the EZCT S2

EZCT S2A USER’S MANUAL REV 1 40 3.3.6. Erasing Test Records From a USB Flash Drive You can erase individual or all test records stored in a USB Fla

REV 1 EZCT S2A USER’S MANUAL 41 d. The following screen will be displayed: 1. ERASE SINGLE REC. Press the [1] key (ERASE SINGLE REC.) if you

EZCT S2A USER’S MANUAL REV 1 42 You can continue to erase additional records or press the [STOP] key to exit to the “START-UP” menu. 2. ERASE ALL R

REV 1 EZCT S2A USER’S MANUAL 43 3.4 Working With Test Plans A test plan is comprised of the saturation test voltage, current range selection, C

EZCT S2A USER’S MANUAL REV 1 44 NOTES • Option 7 (COPY TO THUMB DRIVE) will be listed only if a USB Flash drive is connected to the EZCT S2A’s “US

REV 1 EZCT S2A USER’S MANUAL 45 3.4.2. Printing a Directory of Test Plans Stored in the EZCT S2A’s Memory You can print a directory of all the

REV 1 EZCT S2A USER’S MANUAL 1 CONVENTIONS USED IN THIS DOCUMENT This document uses the following conventions: • A key or switch on the EZCT S2A

EZCT S2A USER’S MANUAL REV 1 46 You will be automatically returned to the “START-UP” menu after the directory printing is finished. A typical Flash

REV 1 EZCT S2A USER’S MANUAL 47 3.4.3. Printing a Directory of Test Plans Stored in a USB Flash Drive To print a directory of all the test plan

EZCT S2A USER’S MANUAL REV 1 48 Figure 9. Typical USB Flash Drive Test Plan Directory Printout

REV 1 EZCT S2A USER’S MANUAL 49 3.4.4. Printing a Test Plan To print a test plan: a. Start from the “START-UP” menu: Press the [3] key (TEST

EZCT S2A USER’S MANUAL REV 1 50 Figure 10. Typical Test Plan Printout Table 4. Description of Test Plan Elements Item Number Description 1 Number

REV 1 EZCT S2A USER’S MANUAL 51 3.4.5. Erasing Test Plans From the Flash EEPROM To erase one or all test plans from the EZCT S2A’s Flash EEPROM

EZCT S2A USER’S MANUAL REV 1 52 Continue with the steps below: 1. ERASE SINGLE PLAN Press the [1] key if you would like to erase a single test pla

REV 1 EZCT S2A USER’S MANUAL 53 If you would like to cancel the erasure process, press the [STOP] key. No test plans will be erased and you wil

EZCT S2A USER’S MANUAL REV 1 54 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. Ma

REV 1 EZCT S2A USER’S MANUAL 55 1. ERASE SINGLE PLAN Press the [1] key (ERASE SINGLE PLAN) if you would like to erase a single plan from the US

EZCT S2A USER’S MANUAL REV 1 2 1.0 INTRODUCTION 1.1 General Description and Features The EZCT S2A is Vanguard’s third-generation, microprocessor-b

EZCT S2A USER’S MANUAL REV 1 56 The following screen will be displayed after all test plans have been erased from the USB Flash drive: Press any k

REV 1 EZCT S2A USER’S MANUAL 57 3.4.7. Loading a Test Plan from the EZCT S2A’s Flash EEPROM To use a test plan for running a test, it must firs

EZCT S2A USER’S MANUAL REV 1 58 Continue with the steps below: Type the test plan number that you would like to load and press the [ENTER] key. If

REV 1 EZCT S2A USER’S MANUAL 59 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

EZCT S2A USER’S MANUAL REV 1 60 e. The following screen will be displayed: 1. YES Press the [1] key if you would like the loaded test plan to be

REV 1 EZCT S2A USER’S MANUAL 61 3.4.9. Running a Test Using a Loaded Test Plan Once a test plan has been loaded into the working memory (see se

EZCT S2A USER’S MANUAL REV 1 62 Press the [ENTER] key and the EZCT S2A will start running the test per the test plan settings. The screen will be u

REV 1 EZCT S2A USER’S MANUAL 63 c. The following screen will be displayed: Press the [ENTER] key. d. The following screen will be displayed:

EZCT S2A USER’S MANUAL REV 1 64 g. The following screen will be displayed: Press the [1] key (YES) if you would like to print the test results. Pr

REV 1 EZCT S2A USER’S MANUAL 65 The following screen will be displayed momentarily: The following confirmation screen will then be displayed:

REV 1 EZCT S2A USER’S MANUAL 3 Test Record Header Information The test record header information can include the company name, substation name,

EZCT S2A USER’S MANUAL REV 1 66 3.4.10. Unloading a Test Plan from the Working Memory To unload the test plan from the working memory and clear all

REV 1 EZCT S2A USER’S MANUAL 67 4.0 CHANGING SETUP PARAMETERS 4.1 Setting the Knee Point Marker Use the steps below to change the knee point m

EZCT S2A USER’S MANUAL REV 1 68 d. The following screen will be displayed: Press either the [1] key (IEEE 30 DEGREE), the [2] key (IEEE 45 DEGREE)

REV 1 EZCT S2A USER’S MANUAL 69 Figure 11. Graphic Report Showing Knee Point Marker Knee Point MarkerKnee Point Marker Type

EZCT S2A USER’S MANUAL REV 1 70 4.2 Enabling and Disabling the Buried CT in Transformer Delta Option 4.2.1. Enabling the Buried CT in Transformer

REV 1 EZCT S2A USER’S MANUAL 71 e. The following screen will be displayed: Press the [1] key (YES). f. The following screen will be displayed

EZCT S2A USER’S MANUAL REV 1 72 c. The following screen will be displayed: Press the [2] key (BURIED CT IN DELTA). d. The following screen will b

REV 1 EZCT S2A USER’S MANUAL 73 Figure 12. Buried CT in a Delta Transformer Illustration 1 Figure 13. Buried CT in a Delta Transformer Illustr

EZCT S2A USER’S MANUAL REV 1 74 NOTES • The CT turns ratio is ideally measured as: Ratio =VhVx. • Since the induced voltage (V) is sensed through

REV 1 EZCT S2A USER’S MANUAL 75 4.3 Setting the Clock To set the EZCT S2A’s internal clock: a. Start from the “START-UP” menu: Press the [2]

EZCT S2A USER’S MANUAL REV 1 4 1.3 Technical Specifications Table 1. EZCT S2A Technical Specifications TYPE Portable current transformer test set

EZCT S2A USER’S MANUAL REV 1 76 4.4 Printing Raw Memory Buffer Data You can print the raw data from the EZCT S2A’s memory buffer for diagnostic pur

REV 1 EZCT S2A USER’S MANUAL 77 Figure 14. Sample Raw Data Printout

EZCT S2A USER’S MANUAL REV 1 78 5.0 DIAGNOSTICS, VERIFICATION, AND TROUBLESHOOTING 5.1 Performing a Diagnostics Test The Diagnostics test mode dis

REV 1 EZCT S2A USER’S MANUAL 79 d. The following screen will be displayed and the Vx, Vh, and Ix values will be continuously updated for 15 sec

EZCT S2A USER’S MANUAL REV 1 80 5.2 Verifying the EZCT S2A’s Vx Sense Circuit Using an External Meter The excitation voltage (Vx) sensed by the EZC

REV 1 EZCT S2A USER’S MANUAL 81 5.3 Verifying the EZCT S2A’s Ix Sense Circuit Using an External Meter You can verify the excitation current (Ix

EZCT S2A USER’S MANUAL REV 1 82 5.4 Quickly Verifying the EZCT S2A’s Turns Ratio Circuit You can quickly verify the EZCT S2A’s turns ratio circuit

REV 1 EZCT S2A USER’S MANUAL 83 5.5 Troubleshooting Guide PROBLEM DESCRIPTION Probable Cause Suggested Solution When running the excitation t

EZCT S2A USER’S MANUAL REV 1 84 6.0 UPGRADING FIRMWARE The EZCT S2A’s firmware is user-upgradeable. You can download the latest firmware from the V

REV 1 EZCT S2A USER’S MANUAL 85 c. The following confirmation page will be displayed: d. You will also receive an email confirming the receip

REV 1 EZCT S2A USER’S MANUAL 5 1.4 EZCT S2A Controls and Indicators The EZCT S2A’s controls and indicators are shown in Figure 1 below. A leade

EZCT S2A USER’S MANUAL REV 1 86 When the firmware upgrade has finished, the following screen will be displayed: You will hear a series of beeps as

REV 1 EZCT S2A USER’S MANUAL 87 7.0 Appendix A - Calculating Turns Ratio on a Shunt Reactor The Vanguard EZCT line of products use the voltage

EZCT S2A USER’S MANUAL REV 1 88 Figure 19 shows a typical connection of a CT mounted on the primary bushing of a single phase transformer. When the

REV 1 EZCT S2A USER’S MANUAL 89 Since this is a single phase transformer, and the transformer secondary winding is accessible, the user can appl

EZCT S2A USER’S MANUAL REV 1 90 Figure 21 show a CT mounted on a typical shunt reactor. This configuration is very similar to the CT mounted on a si

REV 1 EZCT S2A USER’S MANUAL 91 Figure 22 show a CT with 5 taps. The turns-ratio of the CT can be measured by treating the CT secondary winding

EZCT S2A USER’S MANUAL REV 1 92 A common practice for verifying the CT turns-ratio in the field is to apply an AC voltage to the CT secondary full w

REV 1 EZCT S2A USER’S MANUAL 93 Figure 24 Figure 25

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