Vanguard Instruments Company EZCT-2000C User manual

EZCT-2000CTM
DIGITAL CURRENT-TRANSFORMER TESTER
USER’S MANUAL
Vanguard Instruments Company, Inc.
1520 S. Hellman Ave.
Ontario, California 91761, USA
TEL: [phone]
FAX: [phone]
June 2014
Revision 1.4

EZCT-2000C USER’S MANUAL REV 1
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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-2000C, or cause errors in the test results. Vanguard
Instruments Company, Inc. assumes no liability for unsafe or improper use of the EZCT-2000C.
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-2000C can produce a voltage up to 2,000 Vac that can cause severe injury and/or
equipment damage. Due to this reason, the EZCT-2000C shall be used only by trained
operators.
The EZCT-2000C’s X output terminals are rated to 2,200 Vac working voltage. Any voltage above
2,200 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-2000C.
Always ground the EZCT-2000C to a substation ground before connecting the test cables to a
transformer.
DO NOT MODIFY TEST EQUIPMENT
To avoid the risk of introducing additional or unknown hazards, do not install substitute parts or
perform any unauthorized modification to any EZCT-2000C test unit. To ensure that all designed
safety features are maintained, it is highly recommended that repairs 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.
WARNING
Do not remove test leads during a test. Failure to heed this warning can result in electrical
shock to personnel and damage to the equipment.

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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 Common Features (EZCT-2000C and EZCT-2000C Plus) .................................................. 2
1.3 EZCT-2000C Plus Features................................................................................................ 4
1.4 Ordering Information....................................................................................................... 5
1.5 Technical Specifications ................................................................................................... 6
1.6 EZCT-2000C Controls and Indicators ............................................................................... 7
2.0 PRE-TEST SETUP ................................................................................................................... 9
2.1 Operating Voltages .......................................................................................................... 9
2.2 LCD Screen Contrast Control............................................................................................ 9
2.3 Printer Paper Control....................................................................................................... 9
2.4 Printer Paper.................................................................................................................... 9
3.0 OPERATING PROCEDURES ................................................................................................. 11
3.1 EZCT-2000C Cable Connections ..................................................................................... 11
3.2 EZCT-2000C X Input Voltage Warning ........................................................................... 17
3.3 Performing Tests............................................................................................................ 18
3.3.1. Entering Test Record Header Information ............................................................. 18
3.3.2. Performing Resistance, Excitation, and Ratio Tests ............................................... 21
3.3.3. Performing a CT Burden Test (EZCT-2000C Plus Only)........................................... 32
3.3.4. Performing an Insulation Resistance Test.............................................................. 37
3.3.5. Performing a Current Source Test (EZCT-2000C Plus Only) ................................... 42
3.4 Working With Test Records ........................................................................................... 44
3.4.1. Restoring and Printing a Test Record From Flash EEPROM ................................... 44
3.4.2. Restoring and Printing a Test Record From a USB Flash Drive .............................. 48
3.4.3. Printing a Restored Test Record............................................................................. 51
3.4.4. Printing a Directory of Test Records Stored in the EZCT-2000C’s Memory........... 53
3.4.5. Printing a Directory of Test Records Stored in a USB Flash Drive.......................... 56
3.4.6. Copying Test Records to a USB Flash Drive............................................................ 58
3.4.7. Erasing Test Records From the Flash EEPROM ...................................................... 61
3.4.8. Erasing Test Records From a USB Flash Drive ........................................................ 64
3.5 Working With Test Plans................................................................................................ 67
3.5.1. Extracting the Test Plan From a Test Record ......................................................... 67
3.5.2. Printing a Directory of Test Plans Stored in the EZCT-2000C’s Memory ............... 69
3.5.3. Printing a Directory of Test Plans Stored in a USB Flash Drive .............................. 71
3.5.4. Printing a Test Plan................................................................................................. 73
3.5.5. Erasing Test Plans From the Flash EEPROM........................................................... 75
3.5.6. Erasing Test Plans From a USB Flash Drive............................................................. 78
3.5.7. Loading a Test Plan from the EZCT-2000C’s Flash EEPROM .................................. 81
3.5.8. Loading a Test Plan from a USB Flash Drive ........................................................... 83
3.5.9. Running a Test Using a Loaded Test Plan............................................................... 85
3.5.10. Unloading a Test Plan from the Working Memory ................................................ 89

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4.0 CHANGING SETUP PARAMETERS ....................................................................................... 90
4.1 Setting the Knee Point Marker ...................................................................................... 90
4.2 Enabling and Disabling the Buried CT in Transformer Delta Option ............................. 92
4.2.1. Enabling the Buried CT in Transformer Delta Option............................................. 92
4.2.2. Disabling the Buried CT in Transformer Delta Option............................................ 93
4.3 Setting the Clock ............................................................................................................ 97
4.4 Setting the Preferred Interface Language ..................................................................... 98
4.5 Printing Raw Memory Buffer Data............................................................................... 100
4.6 Disabling the H Voltage Checking Feature................................................................... 101
5.0 DIAGNOSTICS, VERIFICATION, AND TROUBLESHOOTING ............................................... 103
5.1 Performing a Diagnostics Test ..................................................................................... 103
5.2 Verifying the EZCT-2000C’s VxSense Circuit Using an External Meter........................ 105
5.3 Verifying the EZCT-2000C’s IxSense Circuit Using an External Meter......................... 106
5.4 Quickly Verifying the EZCT-2000C’s Turns Ratio Circuit .............................................. 107
5.5 Troubleshooting Guide ................................................................................................ 108
6.0 Appendix A - Calculating Turns Ratio on a Shunt Reactor............................................... 109
LIST OF TABLES
Table 1. Ordering Information ........................................................................................................ 5
Table 2. EZCT-2000C Technical Specifications ................................................................................ 6
Table 3. Functional Descriptions of EZCT-2000C Controls and Indicators...................................... 8
Table 4. Descriptions of Tabulated Test Results Elements ........................................................... 30
Table 5. Description of Test Plan Elements .................................................................................. 74
LIST OF FIGURES
Figure 1. EZCT-2000C Controls and Indicators................................................................................ 7
Figure 2. Typical EZCT-2000C Excitation and Ratio Test Cable Connections................................ 11
Figure 3. Connections for a typical high resistance measuring application ................................. 12
Figure 4. Connections for insulation resistance measurement for a CT with 5 terminals ........... 12
Figure 5. Connections for insulation resistance measurement for a CT with 2 terminals ........... 13
Figure 6. EZCT-2000C CT Burden Test Cable Connection (EZCT-2000C Plus Only)....................... 14
Figure 7. EZCT-2000C Typical Current Source Connection (EZCT-2000C Plus Only) .................... 15
Figure 8. Bushing CT Connection on Delta Transformer .............................................................. 16
Figure 9. Bushing CT Connection on Y Transformer ..................................................................... 16
Figure 10. Sample CT Name Plate................................................................................................. 17
Figure 11. Typical EZCT-2000C Tabulated Report Printout .......................................................... 29
Figure 12. Typical EZCT-2000C Graphic Report with Multiple Plot Curves .................................. 31
Figure 13. EZCT-2000C Typical Burden Test Results Report Printout........................................... 36
Figure 14. Connections for a typical high resistance measuring application ............................... 37
Figure 15. Connections for insulation resistance measurement for a CT with 5 terminals ......... 37
Figure 16. Connections for insulation resistance measurement for a CT with 2 terminals ......... 37
Figure 17. EZCT-2000C Typical Insulation Resistance Test Results Report Printout .................... 41
Figure 18. Typical Internal Test Record Directory Printout .......................................................... 55

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Figure 19. Typical USB Flash Drive Record Directory Printout ..................................................... 57
Figure 20. Typical EZCT-2000C Flash EEPROM Test Plan Directory Printout................................ 70
Figure 21. Typical USB Flash Drive Test Plan Directory Printout .................................................. 72
Figure 22. Typical Test Plan Printout ............................................................................................ 74
Figure 23. Graphic Report Showing Knee Point Marker............................................................... 91
Figure 24. Buried CT in a Delta Transformer Illustration 1 ........................................................... 95
Figure 25. Buried CT in a Delta Transformer Illustration 2 ........................................................... 95
Figure 26. EZCT-2000C VxVerification Test Connections ........................................................... 105
Figure 27. EZCT-2000C IxVerification Test Connections............................................................. 106
Figure 28. EZCT-2000C Turns Ratio Verification Test Connections ............................................ 107
Figure 29 ..................................................................................................................................... 109
Figure 30 ..................................................................................................................................... 110
Figure 31 ..................................................................................................................................... 111
Figure 32 ..................................................................................................................................... 112
Figure 33 ..................................................................................................................................... 113
Figure 34 ..................................................................................................................................... 114
Figure 35 ..................................................................................................................................... 115
Figure 36 ..................................................................................................................................... 116
Figure 37 ..................................................................................................................................... 116

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CONVENTIONS USED IN THIS DOCUMENT
This document uses the following conventions:
• A key or switch on the EZCT-2000C is indicated as [KEY] .
•
Menu options are referenced as (MENU OPTION).
•
Screen and menu names are referenced as “SCREEN/MENU NAME”.
•
The terms “test record” and “test shot” are used interchangeably.
•
The terms “USB Flash drive” and “USB thumb drive” are used interchangeably.
• EZCT-2000C LCD screen output is shown as:
• Warning messages are indicated as:
WARNING
Warning message
• Important notes are indicated as:
NOTE
Note details
1. OPTION 1
2. OPTION 2
3. OPTION 3
4. OPTION 4
5. OPTION 5

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1.0 INTRODUCTION
1.1 General Description and Features
The EZCT-2000C is Vanguard’s third-generation microprocessor-based current transformer test
set. The EZCT-2000C is available in two models, the EZCT-2000C and EZCT-2000C Plus. Designed
specifically for CT testing, the EZCT-2000C has the following outstanding features that can
greatly increase productivity and save time during the commissioning stage:
• Performs CT excitation, current-ratio, polarity, and phase angle tests
• Automatically demagnetize CT under test when performing excitation tests
• Measure the DC resistance of transformer windings from 100 micro-ohms to 20 ohms
• Stand-alone or computer-controlled via USB or optional Bluetooth wireless interface
In addition to the above, the EZCT-2000C Plus offers the following features:
• Measures the insulation resistance of the CT's secondary winding
• Measures the CT’s load burden
• Provides a programmable current source (0-20A) that can be used to verify CT loads
The EZCT-2000C’s test leads can be connected to all the CT output terminals, and the complete
CT test can be performed automatically without any operator intervention.
1.2 Common Features (EZCT-2000C and EZCT-2000C Plus)
Excitation Test
The CT excitation test is performed using the ANSI/IEEE C57.13.1 test method. Test voltage
ranges from 50, 300, 500,1200 and 2000 Vac can be selected for the excitation test. The test
voltage is raised and lowered automatically by the EZCT-2000C. The excitation test voltage and
current data is collected and stored in the EZCT-2000C’s internal memory. Knee point voltages
(ANSI 10/50, IEC 60044, IEEE-30, IEEE-45) are calculated and printed on the test report. All of
the EZCT-2000C’s test leads can be connected to the CT output terminals (X1, X2, X3, X4 and
X5), and there is no lead switching required during testing. This convenient arrangement allows
for testing any of the 10 possible combinations of X1 to X5. Up to 10 excitation tests can be
stored in one record. Once the test is completed, the test report and CT excitation curves can
be printed on the built-in thermal printer.
Demagnetization
The EZCT-2000C automatically demagnetizes the CT under test when performing an excitation
test.
Winding Resistance Test
The EZCT-2000C can measure the DC resistance of transformer windings from 100 micro-ohms
to 10 ohms.
Ratio and Polarity Tests
The CT current-ratio is determined using the ANSI/IEEE C57.12.90 measurement method. A test
voltage is applied on any two terminals (X1 to X5) of the CT, and the induced voltage is
measured through the H1 and H2 terminals of the CT. The CT current-ratio is displayed and also
stored in memory. The current-ratio is measured from 0.8 to 5,000. The CT winding polarity is

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displayed as a “+” sign (in-phase) or a “-” sign (out-of-phase) and is annotated with the phase
angle in degrees. The CT current ratio error and phase displacement is also calculated based on
the CT burden (or rated power) and rated current.
Current Ratio and Phase Error Tables
As part of the tabulated test results, the EZCT-2000C can also print the current ratio and current
phase error tables.
Test Record Header Information
Test record header information, including the company, substation name, circuit ID,
manufacturer, mode, CT serial number, and the operator’s name, can be stored with each
record. 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.
User Interface and Display
The EZCT-2000C features a back-lit LCD screen (240 x 128 pixels) that is clearly viewable in both
bright sunlight and low-light levels. An "QWERTY"-style membrane keypad is used to enter test
information and to control the unit’s functions.
Built-in Thermal Printer
A 4.5-inch wide built-in thermal printer can print the CT test results and excitation curves.
Computer Interface
The EZCT-2000C can be used as a stand-alone unit or can be computer-controlled. It can be
connected to a PC via the USB port or wirelessly via Bluetooth. In computer-controlled mode,
using the included CT Analysis Software, test records can be downloaded from the EZCT-
2000C’s memory, or CT tests can be run from the PC. Test plans can also be created with the
provided software. A test plan defines the various test parameters (test voltage, current range,
nameplate ratios, etc.) and can be used to quickly perform tests. Additionally, tabulated test
records are automatically exported to PDF, Excel, and XML formats for further analysis.
Internal Test Record Storage
The EZCT-2000C can store up to 140 test records in Flash EEPROM. Each record may contain up
to 10 excitation curves, burden test reports, current ratio readings, and polarity and DC
resistance readings. Test records can be recalled and printed on the built-in thermal printer.
They can also be transferred to a PC using the USB port, wirelessly via Bluetooth, or via the USB
Flash drive interface port.

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Internal Test Plan Storage
The EZCT-2000C can store up to 128 CT test plans in Flash EEPROM. A test plan is comprised of
the excitation test voltage, current range selection, CT nameplate ratios, and CT winding
terminal combinations (X1 to X5) for each test and also includes the insulation test definition.
Up to 10 test definitions can be stored per test plan. The ability to store test plans makes CT
testing an extremely simple process. To perform a test, the EZCT-2000C is connected to the CT
terminals and a test plan is selected to run.
Creating test plans for the EZCT-2000C is also a simple process. A test plan can be created using
the EZCT-2000C’s keypad or can be created on a PC (with provided software) and then
downloaded to the EZCT-2000C via the USB port or Bluetooth. For added convenience, test
plans can also be copied from a USB Flash drive to the EZCT-2000C via the USB Flash drive
interface.
External Data Storage
The EZCT-2000C features a USB Flash drive interface that makes it very convenient to store and
transfer test records and test plans. By using a USB Flash drive, test records and test plans can
be quickly transferred between a computer and the EZCT-2000C without the need to connect
the unit to the computer.
1.3 EZCT-2000C Plus Features
CT Winding Insulation Resistance Test Feature
The EZCT-2000C Plus can also measure the insulation resistance of the CT’s secondary winding
using a test voltage up to 1000 Vdc. The DC winding resistance reading range is from 2 to 500
Mega-ohms. The insulation resistance test results are displayed and printed on the report.
CT Burden Test
The EZCT-2000C Plus can measure the CT’s actual connected burden by injecting a 1A or 5A test
current into the load. The CT burden measurements (Voltage, current, Cos ϕ, and burden
impedance) are displayed on the screen and printed on the test report. This important test
verifies the actual CT measured burden before putting the CT in service, thus avoiding any
potential configuration conflicts.
Current Source
The EZCT-2000C Plus offers an optional programmable current source (0-20A, 0-15Vac) that can
be used to verify CT loads. The on-time timer and output current are displayed on the LCD
screen.

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1.4 Ordering Information
To order additional EZCT-2000C units or accessories, please contact your Vanguard Instruments
sales representative and reference the part numbers listed in Table 1. Please visit our web site
at http://www.vanguard-instruments.com/sales-reps to find your nearest Vanguard
Instruments sales representative.
Table 1. Ordering Information
Part Number Description
9019-UC EZCT-2000C [110V] Unit and Cables
9034-UC EZCT-2000C [220V] Unit and Cables
9019-SC EZCT-2000C Shipping Case
9019-IC EZCT-2000C Insulation Resistance Test and Current Source Feature
8000-0157 Replacement H cable set with banana jacks
8000-0108 Replacement X cable set
8000-0109 Replacement current and Megger cable set
8000-0005 USB cable
8000-0017 Large cable carrying duffel bag
TP4-CS TP4 thermal printer paper (case of 24 rolls)