Vanguard EZCT-2000A Bedienungsanleitung

EZCT-2000ATMDIGITAL CURRENT-TRANSFORMER TESTER USER’S MANUAL Vanguard Instruments Company, Inc.1520 S. Hellman Ave. Ontario, California 9176

EZCT-2000A USER’S MANUAL REV 1 6 1.4 EZCT-2000A Controls and Indicators The EZCT-2000A’s controls and indicators are shown in Figure 1 below. A lea

EZCT-2000A USER’S MANUAL REV 1 96 Figure 24 show a CT with 5 taps. The turns-ratio of the CT can be measured by treating the CT secondary winding as

REV 1 EZCT-2000A USER’S MANUAL 97 A common practice for verifying the CT turns-ratio in the field is to apply an AC voltage to the CT secondary

EZCT-2000A USER’S MANUAL REV 1 98 Figure 26 Figure 27

1520 S. Hellman Ave • Ontario, CA 91761 • USA Phone: 909-923-9390 • Fax: 909-923-9391 www.vanguard-instruments.com

REV 1 EZCT-2000A USER’S MANUAL 7 Table 2. Functional Descriptions of EZCT-2000A Controls and Indicators Item Number Panel Markings Functional D

EZCT-2000A USER’S MANUAL REV 1 8 2.0 PRE-TEST SETUP 2.1 Operating Voltages The EZCT-2000A’s operating voltage is preset at the factory for 100-120

REV 1 EZCT-2000A USER’S MANUAL 9 2.5 Replacing the Thermal Printer Paper The roll of thermal paper is housed inside a dispenser underneath the

EZCT-2000A USER’S MANUAL REV 1 10 3.0 OPERATING PROCEDURES 3.1 EZCT-2000A Cable Connections Always connect the EZCT-2000A to the substation ground

REV 1 EZCT-2000A USER’S MANUAL 11 Figure 3. Bushing CT Connection on Delta Transformer Figure 4. Bushing CT Connection on Y Transformer

EZCT-2000A USER’S MANUAL REV 1 12 3.2 EZCT-2000A X Input Voltage Warning The EZCT-2000A X output terminals are rated to 2,000 Vac working voltage.

REV 1 EZCT-2000A USER’S MANUAL 13 3.3 Performing Tests 3.3.1. Entering Test Record Header Information You can enter the test record header inf

EZCT-2000A USER’S MANUAL REV 1 14 d. The following screen will be displayed: Type the station name using the alpha-numeric keypad and then press t

REV 1 EZCT-2000A USER’S MANUAL 15 h. The following screen will be displayed: Type the serial number using the alpha-numeric keypad and then pr

EZCT-2000A USER’S MANUAL REV 1 i SAFETY SUMMARY FOLLOW EXACT OPERATING PROCEDURES Any deviation from the procedures described in this User’s Manua

EZCT-2000A USER’S MANUAL REV 1 16 3.3.2. Performing Resistance, Excitation, and Ratio Tests The following procedure describes the general steps for

REV 1 EZCT-2000A USER’S MANUAL 17 e. If the selected test included an excitation test, the following screen will be displayed: Select the maxi

EZCT-2000A USER’S MANUAL REV 1 18 Type the second number using the keypad and then press the [ENTER] key. Continue to step g. 2. NO Press the [2]

REV 1 EZCT-2000A USER’S MANUAL 19 NOTE If you had selected a test current greater than 1 Amp in step e, the following screen will be displayed:

EZCT-2000A USER’S MANUAL REV 1 20 l. The following screen will be displayed showing a summary of the test parameters: Press the [START] key to sta

REV 1 EZCT-2000A USER’S MANUAL 21 When the testing is finished, the test results graph will be displayed: Press any key on the keypad to conti

EZCT-2000A USER’S MANUAL REV 1 22 q. The following screen will be displayed: Press any key to continue. r. The following screen will be displayed

REV 1 EZCT-2000A USER’S MANUAL 23 t. The following confirmation screen will then be displayed: NOTE The test record number is automatically a

EZCT-2000A USER’S MANUAL REV 1 24 Figure 6. Typical EZCT-2000A Tabulated Report Printout

REV 1 EZCT-2000A USER’S MANUAL 25 Table 3. Descriptions of Tabulated Test Results Elements Item Number Description 1 Test record header informat

REV 1 EZCT-2000A USER’S MANUAL ii TABLE OF CONTENTS CONVENTIONS USED IN THIS DOCUMENT ...

EZCT-2000A USER’S MANUAL REV 1 26 Figure 7. Typical EZCT-2000A Graphic Report Figure 8. Typical EZCT-2000A Graphic Report with Multiple Plot Curve

REV 1 EZCT-2000A USER’S MANUAL 27 3.4 Working With Test Records 3.4.1. Restoring and Printing a Test Record From Flash EEPROM You can restore

EZCT-2000A USER’S MANUAL REV 1 28 Press the [1] key (INTERNAL STORAGE). The following screen will then be displayed: Continue with the steps below

REV 1 EZCT-2000A USER’S MANUAL 29 The following screen will be displayed: If you do not want to print the test record, press the [2] key (NO).

EZCT-2000A USER’S MANUAL REV 1 30 Press any key to continue. The following screen will be displayed: If you do not want to print the test record, p

REV 1 EZCT-2000A USER’S MANUAL 31 3.4.2. Restoring and Printing a Test Record From a USB Flash Drive You can restore a test record from a USB F

EZCT-2000A USER’S MANUAL REV 1 32 Type the record number that you would like to restore and press the [ENTER] key. If you do not know the record nu

REV 1 EZCT-2000A USER’S MANUAL 33 h. The following screen will be displayed: Press the [1] key to print the full tabulated data and graphics r

EZCT-2000A USER’S MANUAL REV 1 34 3.4.3. Printing a Restored Test Record You can print a test record at the time that it is restored from the Flash

REV 1 EZCT-2000A USER’S MANUAL 35 Press the [1] key to print the tabulated data and graphics results on the thermal printer. The test record wil

EZCT-2000A USER’S MANUAL REV 1 iii 4.3 Setting the Clock ...

EZCT-2000A USER’S MANUAL REV 1 36 3.4.4. Printing a Directory of Test Records Stored in the EZCT-2000A’s Memory You can print a directory of all th

REV 1 EZCT-2000A USER’S MANUAL 37 Continue with the steps below: Press the [1] key to print a full directory listing of all the test records st

EZCT-2000A USER’S MANUAL REV 1 38 Figure 9. Typical Internal Test Record Directory Printout

REV 1 EZCT-2000A USER’S MANUAL 39 3.4.5. Printing a Directory of Test Records Stored in a USB Flash Drive You can print a directory of all the

EZCT-2000A USER’S MANUAL REV 1 40 Figure 10. Typical USB Flash Drive Record Directory Printout

REV 1 EZCT-2000A USER’S MANUAL 41 3.4.6. Copying Test Records to a USB Flash Drive You can easily copy test records stored in the EZCT-2000A’s

EZCT-2000A USER’S MANUAL REV 1 42 1. COPY SINGLE RECORD Press the [1] key (COPY SINGLE RECORD) if you would like to copy a single record from the E

REV 1 EZCT-2000A USER’S MANUAL 43 2. COPY ALL RECORDS Press the [2] key (COPY ALL RECORDS) if you would like to copy all the test records from

EZCT-2000A USER’S MANUAL REV 1 44 3.4.7. Erasing Test Records From the Flash EEPROM You can erase individual or all test records stored in the EZCT

REV 1 EZCT-2000A USER’S MANUAL 45 Continue with the steps below: 1. ERASE SINGLE REC. Press the [1] key if you would like to erase a single re

REV 1 EZCT-2000A USER’S MANUAL 1 CONVENTIONS USED IN THIS DOCUMENT This document uses the following conventions: • A key or switch on the EZCT-2

EZCT-2000A USER’S MANUAL REV 1 46 2. ERASE ALL RECORDS Press the [2] key if you would like to erase all of the test records stored in the EZCT-2000

REV 1 EZCT-2000A USER’S MANUAL 47 3.4.8. Erasing Test Records From a USB Flash Drive You can erase individual or all test records stored in a U

EZCT-2000A USER’S MANUAL REV 1 48 d. The following screen will be displayed: 1. ERASE SINGLE REC. Press the [1] key (ERASE SINGLE REC.) if you wo

REV 1 EZCT-2000A USER’S MANUAL 49 2. ERASE ALL RECORDS Press the [2] key (ERASE ALL RECORDS) if you would like to erase all of the test records

EZCT-2000A USER’S MANUAL REV 1 50 3.5 Working With Test Plans A test plan is comprised of the saturation test voltage, current range selection, CT

REV 1 EZCT-2000A USER’S MANUAL 51 NOTE If there is no test record in the working memory, the following screen will be displayed: Press any key

EZCT-2000A USER’S MANUAL REV 1 52 3.5.2. Printing a Directory of Test Plans Stored in the EZCT-2000A’s Memory You can print a directory of all the

REV 1 EZCT-2000A USER’S MANUAL 53 You will be automatically returned to the “START-UP” menu after the directory printing is finished. A typical

EZCT-2000A USER’S MANUAL REV 1 54 3.5.3. Printing a Directory of Test Plans Stored in a USB Flash Drive. To print a directory of all the test plans

REV 1 EZCT-2000A USER’S MANUAL 55 Figure 12. Typical USB Flash Drive Test Plan Directory Printout

EZCT-2000A USER’S MANUAL REV 1 2 1.0 INTRODUCTION 1.1 General Description and Features The EZCT-2000A is Vanguard’s third-generation microprocesso

EZCT-2000A USER’S MANUAL REV 1 56 3.5.4. Printing a Test Plan To print a test plan: a. Start from the “START-UP” menu: Press the [3] key (TEST PL

REV 1 EZCT-2000A USER’S MANUAL 57 Figure 13. Typical Test Plan Printout Table 4. Description of Test Plan Elements Item Number Description 1 N

EZCT-2000A USER’S MANUAL REV 1 58 3.5.5. Erasing Test Plans From the Flash EEPROM To erase one or all test plans from the EZCT-2000A’s Flash EEPROM

REV 1 EZCT-2000A USER’S MANUAL 59 Continue with the steps below: 1. ERASE SINGLE PLAN Press the [1] key if you would like to erase a single te

EZCT-2000A USER’S MANUAL REV 1 60 If you would like to cancel the erasure process, press the [STOP] key. No test plans will be erased and you will

REV 1 EZCT-2000A USER’S MANUAL 61 3.5.6. Erasing Test Plans From a USB Flash Drive To erase one or all test plans stored on a USB Flash drive:

EZCT-2000A USER’S MANUAL REV 1 62 1. ERASE SINGLE PLAN Press the [1] key (ERASE SINGLE PLAN) if you would like to erase a single plan from the USB

REV 1 EZCT-2000A USER’S MANUAL 63 The following screen will be displayed after all of the test plans have been erased from the USB Flash drive:

EZCT-2000A USER’S MANUAL REV 1 64 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 firs

REV 1 EZCT-2000A USER’S MANUAL 65 Continue with the steps below: Type the test plan number that you would like to load and press the [ENTER] k

REV 1 EZCT-2000A USER’S MANUAL 3 Test Record Header Information Test record header information can include the company name, substation name, ci

EZCT-2000A USER’S MANUAL REV 1 66 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 U

REV 1 EZCT-2000A USER’S MANUAL 67 e. The following screen will be displayed: 1. YES Press the [1] key if you would like the loaded test plan

EZCT-2000A USER’S MANUAL REV 1 68 3.5.9. Running a Test Using a Loaded Test Plan Once a test plan has been loaded into the working memory (see sect

REV 1 EZCT-2000A USER’S MANUAL 69 When the test has finished, the following screen will be displayed: Press the [1] key (YES) to save the recor

EZCT-2000A USER’S MANUAL REV 1 70 c. The following screen will be displayed: Use the alpha-numeric keys on the keypad to enter a test note and pre

REV 1 EZCT-2000A USER’S MANUAL 71 g. The following screen will be displayed: Press the [1] key (YES) to keep the test results. h. The followi

EZCT-2000A USER’S MANUAL REV 1 72 The following confirmation screen will then be displayed: Press any key to return to the “START-UP” menu. RECORD

REV 1 EZCT-2000A USER’S MANUAL 73 3.5.10. Unloading a Test Plan from the Working Memory To unload the test plan from the working memory and clea

EZCT-2000A USER’S MANUAL REV 1 74 4.0 CHANGING SETUP PARAMETERS 4.1 Setting the Knee Point Marker Use the steps below to change the knee point mar

REV 1 EZCT-2000A USER’S MANUAL 75 d. The following screen will be displayed: Press either the [1] key (IEEE 30 DEGREE), the [2] key (IEEE 45 D

EZCT-2000A USER’S MANUAL REV 1 4 1.2 Furnished Accessories The EZCT-2000A comes furnished with the following: • 1 Power Cord • 1 20-foot X Cable

EZCT-2000A USER’S MANUAL REV 1 76 4.2 Enabling and Disabling the Buried CT in Transformer Delta Option 4.2.1. Enabling the Buried CT in Transforme

REV 1 EZCT-2000A USER’S MANUAL 77 e. The following screen will be displayed: Press the [1] key (YES). f. The following screen will be display

EZCT-2000A USER’S MANUAL REV 1 78 c. The following screen will be displayed: Press the [2] key (BURIED CT IN DELTA). d. The following screen will

REV 1 EZCT-2000A USER’S MANUAL 79 Figure 15. Buried CT in a Delta Transformer Illustration 1 Figure 16. Buried CT in a Delta Transformer Illus

EZCT-2000A USER’S MANUAL REV 1 80 NOTES • The CT turns ratio is ideally measured as: Ratio =VhVx. • Since the induced voltage (V) is sensed throu

REV 1 EZCT-2000A USER’S MANUAL 81 4.3 Setting the Clock To set the EZCT-2000A’s internal clock: a. Start from the “START-UP” menu: Press the

EZCT-2000A USER’S MANUAL REV 1 82 4.4 Printing Raw Memory Buffer Data You can print the raw data from the EZCT-2000A’s memory buffer for diagnostic

REV 1 EZCT-2000A USER’S MANUAL 83 5.0 DIAGNOSTICS, VERIFICATION, AND TROUBLESHOOTING 5.1 Performing a Diagnostics Test The Diagnostics test mo

EZCT-2000A USER’S MANUAL REV 1 84 d. The following screen will be displayed: Press the [ENTER] key to continue. e. The following screen will be d

REV 1 EZCT-2000A USER’S MANUAL 85 5.2 Verifying the EZCT-2000A’s Vx Sense Circuit Using an External Meter The excitation voltage (Vx) sensed by

REV 1 EZCT-2000A USER’S MANUAL 5 1.3 Technical Specifications Table 1. EZCT-2000A Technical Specifications TYPE Portable current-transformer t

EZCT-2000A USER’S MANUAL REV 1 86 5.3 Verifying the EZCT-2000A’s Ix Sense Circuit Using an External Meter You can verify the excitation current (Ix

REV 1 EZCT-2000A USER’S MANUAL 87 5.4 Quickly Verifying the EZCT-2000A’s Turns Ratio Circuit You can quickly verify the EZCT-2000’s turns ratio

EZCT-2000A USER’S MANUAL REV 1 88 5.5 Troubleshooting Guide PROBLEM DESCRIPTION Probable Cause Suggested Solution When running the excitation tes

REV 1 EZCT-2000A USER’S MANUAL 89 6.0 UPGRADING FIRMWARE The EZCT-2000A’s firmware is user-upgradeable. You can download the latest firmware fr

EZCT-2000A USER’S MANUAL REV 1 90 d. You will also receive an email confirming the receipt of your download request. Once your request has been re

REV 1 EZCT-2000A USER’S MANUAL 91 When the firmware upgrade has finished, the following screen will be displayed: You will hear a series of be

EZCT-2000A USER’S MANUAL REV 1 92 7.0 Appendix A - Calculating Turns Ratio on a Shunt Reactor The Vanguard EZCT line of products use the voltage me

REV 1 EZCT-2000A USER’S MANUAL 93 Figure 21 shows a typical connection of a CT mounted on the primary bushing of a single phase transformer. Whe

EZCT-2000A USER’S MANUAL REV 1 94 Since this is a single phase transformer, and the transformer secondary winding is accessible, the user can apply

REV 1 EZCT-2000A USER’S MANUAL 95 Figure 23 show a CT mounted on a typical shunt reactor. This configuration is very similar to the CT mounted o