Vanguard EZCT-2000C Plus Manual de usuario

EZCT-2000CTMDIGITAL CURRENT-TRANSFORMER TESTER USER’S MANUAL Vanguard Instruments Company, Inc.1520 S. Hellman Ave. Ontario, California 917

EZCT-2000C USER’S MANUAL REV 1 6 1.5 Technical Specifications Table 2. EZCT-2000C Technical Specifications TYPE Portable current-transformer test

EZCT-2000C USER’S MANUAL REV 1 96 4.3 Setting the Clock To set the EZCT-2000C’s internal clock: a. Start from the “START-UP” menu: Press the [2]

REV 1 EZCT-2000C USER’S MANUAL 97 4.4 Setting the Preferred Interface Language Follow the steps below to set the preferred language for the EZC

EZCT-2000C USER’S MANUAL REV 1 98 e. A confirmation message will be displayed as shown below: Press any key to return to the "START-UP"

REV 1 EZCT-2000C USER’S MANUAL 99 4.5 Printing Raw Memory Buffer Data You can print the raw data from the EZCT-2000C’s memory buffer for diagno

EZCT-2000C USER’S MANUAL REV 1 100 4.6 Disabling the H Voltage Checking Feature The EZCT-2000C's H Voltage input can only handle voltage up to

REV 1 EZCT-2000C USER’S MANUAL 101 d. The following screen will be displayed: Press the [1] key (YES). e. The following confirmation screen w

EZCT-2000C USER’S MANUAL REV 1 102 5.0 DIAGNOSTICS, VERIFICATION, AND TROUBLESHOOTING 5.1 Performing a Diagnostics Test The Diagnostics test mode

REV 1 EZCT-2000C USER’S MANUAL 103 d. The following screen will be displayed: Press the [ENTER] key to continue. e. The following screen will

EZCT-2000C USER’S MANUAL REV 1 104 5.2 Verifying the EZCT-2000C’s Vx Sense Circuit Using an External Meter The excitation voltage (Vx) sensed by th

REV 1 EZCT-2000C USER’S MANUAL 105 5.3 Verifying the EZCT-2000C’s Ix Sense Circuit Using an External Meter You can verify the excitation curren

REV 1 EZCT-2000C USER’S MANUAL 7 1.6 EZCT-2000C Controls and Indicators The EZCT-2000C’s controls and indicators are shown in Figure 1 below. A

EZCT-2000C USER’S MANUAL REV 1 106 5.4 Quickly Verifying the EZCT-2000C’s Turns Ratio Circuit You can quickly verify the EZCT-2000C’s turns ratio c

REV 1 EZCT-2000C USER’S MANUAL 107 5.5 Troubleshooting Guide PROBLEM DESCRIPTION Probable Cause Suggested Solution When running the excitatio

EZCT-2000C USER’S MANUAL REV 1 108 6.0 Appendix A - Calculating Turns Ratio on a Shunt Reactor The Vanguard EZCT line of products use the voltage m

REV 1 EZCT-2000C USER’S MANUAL 109 Figure 30 shows a typical connection of a CT mounted on the primary bushing of a single phase transformer. Wh

EZCT-2000C USER’S MANUAL REV 1 110 Since this is a single phase transformer, and the transformer secondary winding is accessible, the user can apply

REV 1 EZCT-2000C USER’S MANUAL 111 Figure 32 show a CT mounted on a typical shunt reactor. This configuration is very similar to the CT mounted

EZCT-2000C USER’S MANUAL REV 1 112 Figure 33 show a CT with 5 taps. The turns-ratio of the CT can be measured by treating the CT secondary winding a

REV 1 EZCT-2000C USER’S MANUAL 113 A common practice for verifying the CT turns-ratio in the field is to apply an AC voltage to the CT secondary

EZCT-2000C USER’S MANUAL REV 1 114 Figure 35 Figure 36

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

EZCT-2000C USER’S MANUAL REV 1 8 Table 3. Functional Descriptions of EZCT-2000C Controls and Indicators Item Number Panel Markings Functional Descr

REV 1 EZCT-2000C USER’S MANUAL 9 2.0 PRE-TEST SETUP 2.1 Operating Voltages The EZCT-2000C’s operating voltage is preset at the factory for 100

EZCT-2000C USER’S MANUAL REV 1 10 2.5 Replacing the Thermal Printer Paper The roll of thermal paper is housed inside a dispenser underneath the pri

REV 1 EZCT-2000C USER’S MANUAL 11 3.0 OPERATING PROCEDURES 3.1 EZCT-2000C Cable Connections Always connect the EZCT-2000C to the substation gr

EZCT-2000C USER’S MANUAL REV 1 12 Figure 3. Connections for a typical high resistance measuring application Figure 4. Connections for a typica

REV 1 EZCT-2000C USER’S MANUAL 13 Figure 5. Connections for a typical insulation resistance measurement for a CT with 2 terminals

EZCT-2000C USER’S MANUAL REV 1 14 Figure 6. EZCT-2000C CT Burden Test Cable Connection (EZCT-2000C Plus Only)

REV 1 EZCT-2000C USER’S MANUAL 15 Figure 7. EZCT-2000C Typical Current Source Connection (EZCT-2000C Plus Only)

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

EZCT-2000C USER’S MANUAL REV 1 16 Figure 8. Bushing CT Connection on Delta Transformer Figure 9. Bushing CT Connection on Y Transformer

REV 1 EZCT-2000C USER’S MANUAL 17 3.2 EZCT-2000C X Input Voltage Warning The EZCT-2000C X output terminals are rated to 2,200 Vac working volta

EZCT-2000C USER’S MANUAL REV 1 18 3.3 Performing Tests 3.3.1. Entering Test Record Header Information You can enter the test record header informa

REV 1 EZCT-2000C USER’S MANUAL 19 d. The following screen will be displayed: Type the station name using the keypad and then press the [ENTER]

EZCT-2000C USER’S MANUAL REV 1 20 h. The following screen will be displayed: Type the serial number using the keypad and then press the [ENTER] ke

REV 1 EZCT-2000C USER’S MANUAL 21 3.3.2. Performing Resistance, Excitation, and Ratio Tests The following procedure describes the general steps

EZCT-2000C USER’S MANUAL REV 1 22 e. If the selected test included an excitation test, the following screen will be displayed: Select the maximum

REV 1 EZCT-2000C USER’S MANUAL 23 Press the [ENTER] key. The following screen will be displayed: Type the second number using the keypad and t

EZCT-2000C USER’S MANUAL REV 1 24 i. The following screen will be displayed: Type the burden value using the keypad and then press the [ENTER] key

REV 1 EZCT-2000C USER’S MANUAL 25 m. If the selected test included a resistance test, the following screen will be displayed momentarily: The

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

EZCT-2000C USER’S MANUAL REV 1 26 When the testing is finished, the test results graph will be displayed: Press any key on the keypad to continue.

REV 1 EZCT-2000C USER’S MANUAL 27 r. The following screen will be displayed: Press the [2] key (NO). s. The following screen will be displaye

EZCT-2000C USER’S MANUAL REV 1 28 The following screen will be displayed momentarily: v. The following confirmation screen will then be displayed:

REV 1 EZCT-2000C USER’S MANUAL 29 Figure 11. Typical EZCT-2000C Tabulated Report Printout

EZCT-2000C USER’S MANUAL REV 1 30 Table 4. Descriptions of Tabulated Test Results Elements Item Number Description 1 Test record header information.

REV 1 EZCT-2000C USER’S MANUAL 31 Figure 12. Typical EZCT-2000C Graphic Report with Multiple Plot Curves Knee Point Marker

EZCT-2000C USER’S MANUAL REV 1 32 3.3.3. Performing a CT Burden Test (EZCT-2000C Plus Only) The CT burden test verifies the actual CT burden before

REV 1 EZCT-2000C USER’S MANUAL 33 b. Start from the “START-UP” menu: Press the [1] key (RUN TEST). c. The following screen will be displayed:

EZCT-2000C USER’S MANUAL REV 1 34 f. The following screen will be displayed: Press the [START] key to begin the test. g. The following screen wil

REV 1 EZCT-2000C USER’S MANUAL 35 Then, the following screen will be displayed: Print the [1] key (YES) if you would like to print the test re

EZCT-2000C USER’S MANUAL REV 1 iii 5.5 Troubleshooting Guide ...

EZCT-2000C USER’S MANUAL REV 1 36 j. The following confirmation screen will be displayed: Press any key to return to the “START-UP” menu. Figure

REV 1 EZCT-2000C USER’S MANUAL 37 3.3.4. Performing an Insulation Resistance Test To perform an insulation resistance test: a. Make connection

EZCT-2000C USER’S MANUAL REV 1 38 b. Start from the “START-UP” menu: Press the [1] key (RUN TEST). c. The following screen will be displayed: Pr

REV 1 EZCT-2000C USER’S MANUAL 39 f. The following screen will be displayed: Connect the insulation resistance cables and then press the [STAR

EZCT-2000C USER’S MANUAL REV 1 40 The following screen will then be displayed: Press the [1] key (YES) if you would like to print the test results.

REV 1 EZCT-2000C USER’S MANUAL 41 Press any key to return to the “START-UP” menu. Figure 17. EZCT-2000C Typical Insulation Resistance Test Re

EZCT-2000C USER’S MANUAL REV 1 42 3.3.5. Performing a Current Source Test (EZCT-2000C Plus Only) The EZCT-2000C Plus’s programmable current source

REV 1 EZCT-2000C USER’S MANUAL 43 c. The following screen will be displayed: Press and hold the [∧] key to increase the current. Press and hol

EZCT-2000C USER’S MANUAL REV 1 44 3.4 Working With Test Records 3.4.1. Restoring and Printing a Test Record From Flash EEPROM You can restore a te

REV 1 EZCT-2000C USER’S MANUAL 45 Press the [1] key (INTERNAL STORAGE). The following screen will then be displayed: Continue with the steps b

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

EZCT-2000C USER’S MANUAL REV 1 46 2. SCROLL TO SELECT Press the [2] key if you would like to scroll through a directory of the stored test records.

REV 1 EZCT-2000C USER’S MANUAL 47 Press the [1] key to print the tabulated data and graphics results on the thermal printer. The test record wil

EZCT-2000C USER’S MANUAL REV 1 48 3.4.2. Restoring and Printing a Test Record From a USB Flash Drive You can restore a test record from a USB Flash

REV 1 EZCT-2000C USER’S MANUAL 49 e. The following screen will be displayed: Type the record number that you would like to restore and press t

EZCT-2000C USER’S MANUAL REV 1 50 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-2000C USER’S MANUAL 51 Press the [1] key to print the tabulated data and graphics results on the thermal printer. The test record wil

EZCT-2000C USER’S MANUAL REV 1 52 3.4.4. Printing a Directory of Test Records Stored in the EZCT-2000C’s Memory You can print a directory of all th

REV 1 EZCT-2000C USER’S MANUAL 53 Continue with the steps below: Press the [1] key to print a full directory listing of all the test records st

EZCT-2000C USER’S MANUAL REV 1 54 Figure 18. Typical Internal Test Record Directory Printout

REV 1 EZCT-2000C USER’S MANUAL 55 3.4.5. Printing a Directory of Test Records Stored in a USB Flash Drive You can print a directory of all the

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

EZCT-2000C USER’S MANUAL REV 1 56 Figure 19. Typical USB Flash Drive Record Directory Printout

REV 1 EZCT-2000C USER’S MANUAL 57 3.4.6. Copying Test Records to a USB Flash Drive You can easily copy test records stored in the EZCT-2000C’s

EZCT-2000C USER’S MANUAL REV 1 58 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-2000C USER’S MANUAL 59 2. COPY ALL RECORDS Press the [2] key (COPY ALL RECORDS) if you would like to copy all the test records from

EZCT-2000C USER’S MANUAL REV 1 60 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-2000C USER’S MANUAL 61 Continue with the steps below: 1. ERASE SINGLE REC. Press the [1] key if you would like to erase a single re

EZCT-2000C USER’S MANUAL REV 1 62 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-2000C USER’S MANUAL 63 3.4.8. Erasing Test Records From a USB Flash Drive You can erase individual or all test records stored in a U

EZCT-2000C USER’S MANUAL REV 1 64 d. The following screen will be displayed: 1. ERASE SINGLE REC. Press the [1] key (ERASE SINGLE REC.) if you wo

REV 1 EZCT-2000C USER’S MANUAL 65 2. ERASE ALL RECORDS Press the [2] key (ERASE ALL RECORDS) if you would like to erase all of the test records

REV 1 EZCT-2000C USER’S MANUAL 3 displayed as a “+” sign (in-phase) or a “-” sign (out-of-phase) and is annotated with the phase angle in degree

EZCT-2000C USER’S MANUAL REV 1 66 3.5 Working With Test Plans A test plan is comprised of the saturation test voltage, current range selection, CT

REV 1 EZCT-2000C USER’S MANUAL 67 NOTE If there is no test record in the working memory, the following screen will be displayed: Press any key

EZCT-2000C USER’S MANUAL REV 1 68 3.5.2. Printing a Directory of Test Plans Stored in the EZCT-2000C’s Memory You can print a directory of all the

REV 1 EZCT-2000C USER’S MANUAL 69 You will be automatically returned to the “START-UP” menu after the directory printing is finished. A typical

EZCT-2000C USER’S MANUAL REV 1 70 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-2000C USER’S MANUAL 71 Figure 21. Typical USB Flash Drive Test Plan Directory Printout

EZCT-2000C USER’S MANUAL REV 1 72 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-2000C USER’S MANUAL 73 Figure 22. Typical Test Plan Printout Table 5. Description of Test Plan Elements Item Number Description 1 N

EZCT-2000C USER’S MANUAL REV 1 74 3.5.5. Erasing Test Plans From the Flash EEPROM To erase one or all test plans from the EZCT-2000C’s Flash EEPROM

REV 1 EZCT-2000C USER’S MANUAL 75 Continue with the steps below: 1. ERASE SINGLE PLAN Press the [1] key if you would like to erase a single te

EZCT-2000C USER’S MANUAL REV 1 4 Internal Test Plan Storage The EZCT-2000C can store up to 128 CT test plans in Flash EEPROM. A test plan is compris

EZCT-2000C USER’S MANUAL REV 1 76 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-2000C USER’S MANUAL 77 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-2000C USER’S MANUAL REV 1 78 Press the [1] key (ERASE SINGLE PLAN) if you would like to erase a single plan from the USB Flash drive. The follo

REV 1 EZCT-2000C USER’S MANUAL 79 The following screen will be displayed after all of the test plans have been erased from the USB Flash drive:

EZCT-2000C USER’S MANUAL REV 1 80 3.5.7. Loading a Test Plan from the EZCT-2000C’s Flash EEPROM To use a test plan for running a test, it must firs

REV 1 EZCT-2000C USER’S MANUAL 81 Continue with the steps below: Type the test plan number that you would like to load and press the [ENTER] k

EZCT-2000C USER’S MANUAL REV 1 82 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-2000C USER’S MANUAL 83 e. The following screen will be displayed: 1. YES Press the [1] key if you would like the loaded test plan

EZCT-2000C USER’S MANUAL REV 1 84 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-2000C USER’S MANUAL 85 When the test has finished, the following screen will be displayed: Press the [1] key (YES) to save the recor

REV 1 EZCT-2000C USER’S MANUAL 5 1.4 Ordering Information To order additional EZCT-2000C units or accessories, please contact your Vanguard Ins

EZCT-2000C USER’S MANUAL REV 1 86 c. The following screen will be displayed: Use the keypad to enter a test note and press the [ENTER] key. d. Th

REV 1 EZCT-2000C USER’S MANUAL 87 g. The following screen will be displayed: Press the [1] key (YES) to keep the test results. h. The followi

EZCT-2000C USER’S MANUAL REV 1 88 3.5.10. Unloading a Test Plan from the Working Memory To unload the test plan from the working memory and clear al

REV 1 EZCT-2000C USER’S MANUAL 89 4.0 CHANGING SETUP PARAMETERS 4.1 Setting the Knee Point Marker Use the steps below to change the knee point

EZCT-2000C USER’S MANUAL REV 1 90 d. The following screen will be displayed: Press either the [1] key (IEEE 30 DEGREE), the [2] key (IEEE 45 DEGRE

REV 1 EZCT-2000C USER’S MANUAL 91 4.2 Enabling and Disabling the Buried CT in Transformer Delta Option 4.2.1. Enabling the Buried CT in Transf

EZCT-2000C USER’S MANUAL REV 1 92 e. The following screen will be displayed: Press the [1] key (YES). f. The following screen will be displayed:

REV 1 EZCT-2000C USER’S MANUAL 93 b. The following screen will be displayed: Press the [6] key (NEXT PAGE). c. The following screen will be d

EZCT-2000C USER’S MANUAL REV 1 94 Figure 24. Buried CT in a Delta Transformer Illustration 1 Figure 25. Buried CT in a Delta Transformer Illustrat

REV 1 EZCT-2000C USER’S MANUAL 95 NOTES • The CT turns ratio is ideally measured as: Ratio =VhVx. • Since the induced voltage (V) is sensed t