Vanguard EZCT-2KA User manual

EZCT-2KATM
DIGITAL CURRENT-TRANSFORMER TESTER
USER’S MANUAL
Vanguard Instruments Company, Inc.
1520 S. Hellman Ave.
Ontario, California 91761, USA
TEL: [phone]
FAX: [phone]
November 2016
Revision 1.1

EZCT-2KA USER’S MANUAL REV 1.0
i
SAFETY SUMMARY
FOLLOW EXACT OPERATING PROCEDURES
Any deviation from the procedures described in this User’s Manual may create one or more safety hazards, may
damage the EZCT-2KA, or cause errors in the test results. Vanguard Instruments Company, Inc. assumes no liability
for unsafe or improper use of the EZCT-2KA.
All safety precautions provided in this manual must be observed during all phases of testing including test
preparation, test lead connection, actual testing, and test lead disconnection.
SAFETY WARNINGS AND CAUTIONS
The EZCT-2KA can produce a voltage up to 2,000 Vac that can cause severe injury and/or equipment damage. Due
to this reason, the EZCT-2KA shall be used only by trained operators.
The EZCT-2KA’s X output terminals are rated to 2,000 Vac working voltage. Any voltage above 2,000 Vac will
damage the input circuitry. Please see section 3.2 for further information.
All devices under test shall be off-line and fully isolated. Never attempt to test any current transformer still
connected to a circuit. All current transformer terminals shall be isolated before conducting any test with the EZCT-
2KA. Always ground the EZCT-2KA to a substation ground before connecting the test cables to a transformer.
SERVICE AND REPAIR
• Do not install substitute parts or perform any unauthorized modifications to any EZCT-2KA test unit.
• Repairs must be performed only by Vanguard Instruments Company factory personnel or by an authorized
repair service provider. Unauthorized modifications can cause safety hazards and will void the manufacturer's
warranty.
EQUIPMENT RATINGS
IP Rating: The EZCT-2KA enclosure has an IP rating of 32.
Pollution Degree: The EZCT-2KA has a pollution rating of 2.
Operating Voltage: The EZCT-2KA is rated for use with an operating voltage of 120V or 240V (factory pre-set) ±10%
of selected voltage.
Power Cord: The EZCT-2KA is supplied with a 16 AWG, 16A power cord with a NEMA 5-15P plug. A replacement
cable must have the same or better rating and is available through the manufacturer.
VENTILATION REQUIREMENTS
The EZCT-2KA must be operated with the enclosure lid open.
SAFETY SYMBOLS
Indicates that caution should be exercised
Indicates location of chassis ground terminal
CLEANING
To clean the EZCT-2KA:
• Disconnect all cables and turn the unit off.
• Use a soft, lint-free cloth to wipe all surfaces clean.
• Avoid getting moisture in openings and connectors.
• Don't use any cleaning products or compressed air.

REV 1.0 EZCT-2KA USER’S MANUAL
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TABLE OF CONTENTS
CONVENTIONS USED IN THIS DOCUMENT ....................................................................... 1
1.0 INTRODUCTION .................................................................................................................... 2
1.1 General Description and Features ................................................................................... 2
1.2 Furnished Accessories ...................................................................................................... 4
1.3 Technical Specifications ................................................................................................... 5
1.4 EZCT-2KA Controls and Indicators ................................................................................... 6
2.0 PRE-TEST SETUP ................................................................................................................... 8
2.1 Operating Voltages .......................................................................................................... 8
2.2 LCD Screen Contrast Control ............................................................................................ 8
2.3 Printer Paper Control ....................................................................................................... 8
2.4 Printer Paper .................................................................................................................... 8
3.0 OPERATING PROCEDURES ................................................................................................. 10
3.1 EZCT-2KA Cable Connections ......................................................................................... 10
3.2 EZCT-2KA X Input Voltage Warning ............................................................................... 12
3.3 Performing Tests ............................................................................................................ 13
3.3.1. Entering Test Record Header Information ............................................................. 13
3.3.2. Performing Resistance, Excitation, and Ratio Tests ............................................... 16
3.4 Working With Test Records ........................................................................................... 27
3.4.1. Restoring and Printing a Test Record From Flash EEPROM ................................... 27
3.4.2. Restoring and Printing a Test Record From a USB Flash Drive .............................. 31
3.4.3. Printing a Restored Test Record ............................................................................. 33
3.4.4. Printing a Directory of Test Records Stored in the EZCT-2KA’s Memory ............... 35
3.4.5. Printing a Directory of Test Records Stored in a USB Flash Drive .......................... 38
3.4.6. Copying Test Records to a USB Flash Drive ............................................................ 40
3.4.7. Erasing Test Records From the Flash EEPROM ...................................................... 42
3.4.8. Erasing Test Records From a USB Flash Drive ........................................................ 46
3.5 Working With Test Plans ................................................................................................ 49
3.5.1. Extracting the Test Plan From a Test Record ......................................................... 49
3.5.2. Printing a Directory of Test Plans Stored in the EZCT-2KA’s Memory ................... 51
3.5.3. Printing a Directory of Test Plans Stored in a USB Flash Drive. ............................. 53
3.5.4. Printing a Test Plan ................................................................................................. 55
3.5.5. Erasing Test Plans From the Flash EEPROM ........................................................... 57
3.5.6. Erasing Test Plans From a USB Flash Drive ............................................................. 61
3.5.7. Loading a Test Plan from the EZCT-2KA’s Flash EEPROM ...................................... 64
3.5.8. Loading a Test Plan from a USB Flash Drive ........................................................... 66
3.5.9. Running a Test Using a Loaded Test Plan ............................................................... 68
3.5.10. Unloading a Test Plan from the Working Memory ................................................ 73
4.0 CHANGING SETUP PARAMETERS ....................................................................................... 74
4.1 Setting the Knee Point Marker ...................................................................................... 74
4.2 Enabling and Disabling the Buried CT in Transformer Delta Option ............................. 76
4.2.1. Enabling the Buried CT in Transformer Delta Option............................................. 76
4.2.2. Disabling the Buried CT in Transformer Delta Option ............................................ 77

EZCT-2KA USER’S MANUAL REV 1.0
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4.3 Setting the Clock ............................................................................................................ 80
4.4 Toggling the Printing of Impedance Values ................................................................... 82
4.5 Toggling the Calibration Notification Feature ............................................................... 84
4.6 Re-setting the List of Paired Bluetooth Devices ............................................................ 86
4.7 Printing Raw Memory Buffer Data ................................................................................. 88
5.0 DIAGNOSTICS, VERIFICATION, AND TROUBLESHOOTING ................................................. 89
5.1 Performing a Diagnostics Test ....................................................................................... 89
5.2 Verifying the EZCT-2KA’s Vx Sense Circuit Using an External Meter ............................. 91
5.3 Verifying the EZCT-2KA’s Ix Sense Circuit Using an External Meter ............................... 92
5.4 Quickly Verifying the EZCT-2KA’s Turns Ratio Circuit .................................................... 93
5.5 Troubleshooting Guide .................................................................................................. 94
7.0 Appendix A - Calculating Turns Ratio on a Shunt Reactor ................................................. 96
LIST OF TABLES
Table 1. EZCT-2KA Technical Specifications .................................................................................... 5
Table 2. Functional Descriptions of EZCT-2KA Controls and Indicators ......................................... 7
Table 3. Descriptions of Tabulated Test Results Elements ........................................................... 25
Table 4. Description of Test Plan Elements .................................................................................. 56
LIST OF FIGURES
Figure 1. EZCT-2KA Controls and Indicators ................................................................................... 6
Figure 2. Typical EZCT-2KA Excitation and Ratio Test Cable Connection ..................................... 10
Figure 3. Bushing CT Connection on Delta Transformer .............................................................. 11
Figure 4. Bushing CT Connection on Y Transformer ..................................................................... 11
Figure 5. Sample CT Name Plate ................................................................................................... 12
Figure 6. Typical EZCT-2KA Tabulated Report Printout ................................................................ 24
Figure 7. Typical EZCT-2KA Graphic Report .................................................................................. 26
Figure 8. Typical EZCT-2KA Graphic Report with Multiple Plot Curves ........................................ 26
Figure 9. Typical Internal Test Record Directory Printout ............................................................ 37
Figure 10. Typical USB Flash Drive Record Directory Printout ..................................................... 39
Figure 11. Typical EZCT-2KA Flash EEPROM Test Plan Directory Printout ................................... 52
Figure 12. Typical USB Flash Drive Test Plan Directory Printout .................................................. 54
Figure 13. Typical Test Plan Printout ............................................................................................ 56
Figure 14. Graphic Report Showing Knee Point Marker ............................................................... 75
Figure 15. Buried CT in a Delta Transformer Illustration 1 ........................................................... 78
Figure 16. Buried CT in a Delta Transformer Illustration 2 ........................................................... 79
Figure 17. CT Data Points Printed With Impedance Values .......................................................... 83
Figure 18. CT Data Points Printed Without Impedance Values .................................................... 83
Figure 19. Sample Test Report Printout with Calibration Due Date ............................................. 85
Figure 20. EZCT-2KA Vx Verification Test Connections ................................................................. 91
Figure 21. EZCT-2KA Ix Verification Test Connections .................................................................. 92
Figure 22. EZCT-2KA Turns Ratio Verification Test Connections .................................................. 93
Figure 23 ....................................................................................................................................... 96
Figure 24 ....................................................................................................................................... 97

REV 1.0 EZCT-2KA USER’S MANUAL
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Figure 25 ....................................................................................................................................... 98
Figure 26 ....................................................................................................................................... 99
Figure 27 ..................................................................................................................................... 100
Figure 28 ..................................................................................................................................... 101
Figure 29 ..................................................................................................................................... 102
Figure 30 ..................................................................................................................................... 103
Figure 31 ..................................................................................................................................... 103

REV 1.0
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EZCT-2KA USER’S MANUAL REV 1.0
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1.0 INTRODUCTION
1.1 General Description and Features
The EZCT-2KA is Vanguard’s third-generation microprocessor-based current transformer test
set. The EZCT-2KA can perform the current transformer (CT) excitation test, measure the CT
winding resistance and CT current-ratio automatically. All of the EZCT-2KA’s test leads can be
connected to the CT output terminals (X1, X2, X3, X4 and X5), eliminating the need for lead
switching during testing. Test voltage output is automatically raised and lowered by the EZCT-
2KA without any operator intervention. With up to 2000 Vac excitation test voltage available,
the EZCT-2KA can easily perform excitation tests on very large CT’s.
Excitation Test
The CT excitation test is performed using the ANSI/IEEE C57.13.1, IEC 60044-1 test method. The
test voltage range for the CT excitation test (50 Vac, 300 Vac, 500 Vac, 1200 Vac or 2000 Vac)
can be selected, and then the test voltage is raised and lowered automatically by the EZCT-2KA.
The excitation test voltage and current data is collected and stored in the unit’s internal
memory. Any of the 10 possible combinations of X1 to X5 can be tested since all of the unit’s
test leads can be connected to all of the CT output terminals at the same time. Up to 10
excitation tests can be stored in one record. Once the test is completed, test results can be
printed and excitation curves can be plotted on the built-in 4.5-inch wide thermal printer.
CT Ratio and Polarity Tests
The EZCT-2KA determines the CT current-ratio using the ANSI/IEEE C57.12.90 measurement
method. A test voltage is applied on any two terminals of the CT (X1 to X5), and the induced
voltage is measured through the CT’s H1 and H2 terminals. The CT current-ratio is displayed on
the screen and stored in memory. The current ratio measuring range is from 0.8 to 10,000 to 1.
The CT winding polarity is displayed as a “+” sign (in-phase) or a “-” sign (out-of-phase) and is
annotated with the phase angle in degrees.
Demagnetization
The EZCT-2KA automatically demagnetizes the CT under test when performing an excitation
test.
CT Winding Resistance Test
The EZCT-2KA can also measure the DC resistance of the CT winding under test. The DC winding
resistance measuring range is from 100 micro-ohms to 20 ohms.
User Interface
The EZCT-2KA features a back-lit LCD screen (240 x 128 pixels) that is viewable in both bright
sunlight and low-light levels. A rugged, "QWERTY"-style, membrane keypad is used to control
the unit.

REV 1.0 EZCT-2KA USER’S MANUAL
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Internal Test Record Storage
The EZCT-2KA can store up to 1,000 test records in Flash EEPROM. Each test record may contain
up to 10 excitation curves, current-ratio readings, polarity and DC resistance readings. Test
records can be recalled and printed on the built-in thermal printer.
External Data Storage
The EZCT-2KA features a standard USB Flash drive interface that makes it very convenient to
store and transfer test records and test plans. By plugging in a USB Flash drive, you can quickly
transfer your test records and test plans between a computer and the EZCT-2KA without the
need to connect the unit to the computer.
Internal Test Plan Storage
The EZCT-2KA can store up to 128 CT test plans in Flash EEPROM. A test plan defines the
excitation test voltage and current range selection, CT nameplate ratio, and CT winding
terminals (X1 to X5) for each of the tests. Up to 10 test definitions can be stored per test plan.
The use of a test plan greatly simplifies the CT testing process; the EZCT-2KA is connected to the
CT terminals and a test plan is simply selected and run. Test plans can be created on the EZCT-
2KA itself or created on a PC and downloaded to the EZCT-2KA via the unit’s built-in USB or
Bluetooth interfaces or transferred to the unit using a USB flash drive.
Test Record Header Information
Test record header information can include the company name, substation name, circuit ID,
manufacturer, CT serial number, operator’s name and test record comments. In addition to the
test record header, a 20-character test description for each test in the record (10 tests per
record) can also be entered.
Computer Interface
The EZCT-2KA can be used as a stand-alone unit or can be computer-controlled via the built-in
USB or Bluetooth interface. Windows®-based Current Transformer Analysis software is
provided with each EZCT-2KA. This software can be used to retrieve test records from the EZCT-
2KA, create test plans, download test plans to the EZCT-2KA, and can also be used to run CT
tests from the PC. Tabulated test records can be exported in PDF, Excel, and XML formats for
further analysis.
Built-in Thermal Printer
A built-in 4.5” wide thermal printer can print the current transformer test report and plot the
excitation curves.

EZCT-2KA USER’S MANUAL REV 1.0
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1.2 Furnished Accessories
The EZCT-2KA comes furnished with the following:
• One 20' (6.1 m) X cable set (P/N 8000-0108)
• One 35' (10.69 m) H cable set (P/N 8000-0157)
• One power and ground combination cable (P/N 8000-0016)
• One USB cable (P/N 8000-0005)
• One cable carrying bag (P/N 8000-0111)

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Portable cur
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Dimensions
Weight: 48 l
b
100 – 120 V
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:
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