EZCT-2000CTM
DIGITAL CURRENT-TRANSFORMER TESTER
USER’S MANUAL
Vanguard Instruments Company, Inc.
1520 S. Hellman Ave.
Ontario, California 91761, USA
TEL: (909) 923-9390
FAX: (909) 923-9391
March 2017
Revision 1.6
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EZCT-2000C
TM
DIGITAL CURRENT-TRANSFORMER TESTER
USER’S MANUAL
Vanguard Instruments Company, Inc.
1520 S. Hellman Ave.
Ontario, California 91761, USA
TEL: (909) 923-
FAX: (909) 923-
March 2017
Revision 1.
EZCT-2000C USER’S MANUAL REV 1
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-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.
REV 1 EZCT-2000C USER’S MANUAL
- CONVENTIONS USED IN THIS DOCUMENT TABLE OF CONTENTS
- 1.0 INTRODUCTION
- 1.1 General Description and Features
- 1.2 Common Features (EZCT-2000C and EZCT-2000C Plus)
- 1.3 EZCT-2000C Plus Features................................................................................................
- 1.4 Ordering Information
- 1.5 Technical Specifications
- 1.6 EZCT-2000C Controls and Indicators
- 2.0 PRE-TEST SETUP
- 2.1 Operating Voltages
- 2.2 LCD Screen Contrast Control............................................................................................
- 2.3 Printer Paper Control
- 2.4 Printer Paper
- 3.0 OPERATING PROCEDURES
- 3.1 EZCT-2000C Cable Connections
- 3.2 EZCT-2000C X Input Voltage Warning
- 3.3 Performing Tests
- 3.3.1. Entering Test Record Header Information
- 3.3.2. Performing Resistance, Excitation, and Ratio Tests
- 3.3.3. Performing a CT Burden Test (EZCT-2000C Plus Only)
- 3.3.4. Performing an Insulation Resistance Test
- 3.3.5. Performing a Current Source Test (EZCT-2000C Plus Only)
- 3.4 Working With Test Records
- 3.4.1. Restoring and Printing a Test Record From Flash EEPROM
- 3.4.2. Restoring and Printing a Test Record From a USB Flash Drive
- 3.4.3. Printing a Restored Test Record
- 3.4.4. Printing a Directory of Test Records Stored in the EZCT-2000C’s Memory
- 3.4.5. Printing a Directory of Test Records Stored in a USB Flash Drive
- 3.4.6. Copying Test Records to a USB Flash Drive
- 3.4.7. Erasing Test Records From the Flash EEPROM
- 3.4.8. Erasing Test Records From a USB Flash Drive
- 3.5 Working With Test Plans
- 3.5.1. Extracting the Test Plan From a Test Record
- 3.5.2. Printing a Directory of Test Plans Stored in the EZCT-2000C’s Memory
- 3.5.3. Printing a Directory of Test Plans Stored in a USB Flash Drive
- 3.5.4. Printing a Test Plan
- 3.5.5. Erasing Test Plans From the Flash EEPROM
- 3.5.6. Erasing Test Plans From a USB Flash Drive.............................................................
- 3.5.7. Loading a Test Plan from the EZCT-2000C’s Flash EEPROM
- 3.5.8. Loading a Test Plan from a USB Flash Drive
- 3.5.9. Running a Test Using a Loaded Test Plan
- 3.5.10. Unloading a Test Plan from the Working Memory
- EZCT-2000C USER’S MANUAL REV
- 4.0 CHANGING SETUP PARAMETERS iii
- 4.1 Setting the Knee Point Marker
- 4.2 Enabling and Disabling the Buried CT in Transformer Delta Option
- 4.2.1. Enabling the Buried CT in Transformer Delta Option.............................................
- 4.2.2. Disabling the Buried CT in Transformer Delta Option............................................
- 4.3 Setting the Clock
- 4.4 Setting the Preferred Interface Language
- 4.5 Printing Raw Memory Buffer Data...............................................................................
- 4.6 Disabling the H Voltage Checking Feature
- 5.0 DIAGNOSTICS, VERIFICATION, AND TROUBLESHOOTING
- 5.1 Performing a Diagnostics Test
- 5.2 Verifying the EZCT-2000C’s Vx Sense Circuit Using an External Meter........................
- 5.3 Verifying the EZCT-2000C’s Ix Sense Circuit Using an External Meter
- 5.4 Quickly Verifying the EZCT-2000C’s Turns Ratio Circuit
- 5.5 Troubleshooting Guide
- 6.0 Appendix A - Calculating Turns Ratio on a Shunt Reactor
- Table 1. Ordering Information LIST OF TABLES
- Table 2. EZCT-2000C Technical Specifications
- Table 3. Functional Descriptions of EZCT-2000C Controls and Indicators......................................
- Table 4. Descriptions of Tabulated Test Results Elements
- Table 5. Description of Test Plan Elements
- Figure 1. EZCT-2000C Controls and Indicators................................................................................ LIST OF FIGURES
- Figure 2. Typical EZCT-2000C Excitation and Ratio Test Cable Connections
- Figure 3. Connections for a typical high resistance measuring application
- Figure 4. Connections for an insulation resistance measurement for a CT with 5 terminals
- Figure 5. Connections for an insulation resistance measurement for a CT with 2 terminals
- Figure 6. EZCT-2000C CT Burden Test Cable Connection (EZCT-2000C Plus Only).......................
- Figure 7. EZCT-2000C Typical Current Source Connection (EZCT-2000C Plus Only)
- Figure 8. Bushing CT Connection on Delta Transformer
- Figure 9. Bushing CT Connection on Y Transformer
- Figure 10. Sample CT Name Plate
- Figure 11. Typical EZCT-2000C Tabulated Report Printout
- Figure 12. Typical EZCT-2000C Graphic Report with Multiple Plot Curves
- Figure 13. EZCT-2000C Typical Burden Test Results Report Printout...........................................
- Figure 14. Connections for Stand-alone Insulation Resistance Measurement Mode
- Figure 15. Connections for an insulation resistance measurement for a CT with 5 terminals
- Figure 16. Connections for an insulation resistance measurement for a CT with 2 terminals
- Figure 17. EZCT-2000C Typical Insulation Resistance Test Results Report Printout
- Figure 18. Typical Internal Test Record Directory Printout
- Figure 19. Typical USB Flash Drive Record Directory Printout iv
- Figure 20. Typical EZCT-2000C Flash EEPROM Test Plan Directory Printout
- Figure 21. Typical USB Flash Drive Test Plan Directory Printout
- Figure 22. Typical Test Plan Printout
- Figure 23. Graphic Report Showing Knee Point Marker
- Figure 24. Buried CT in a Delta Transformer Illustration
- Figure 25. Buried CT in a Delta Transformer Illustration
- Figure 26. EZCT-2000C Vx Verification Test Connections
- Figure 27. EZCT-2000C I x Verification Test Connections.............................................................
- Figure 28. EZCT-2000C Turns Ratio Verification Test Connections
- Figure
- Figure
- Figure
- Figure
- Figure
- Figure
- Figure
- Figure
- Figure
EZCT-2000C USER’S MANUAL REV 1
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 C57.13.1 Section 8.1 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
REV 1 EZCT-2000C USER’S MANUAL
winding polarity is 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.
REV 1 EZCT-2000C USER’S MANUAL
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)
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EZCT-2000C USER’S MANUAL REV 1
Table 3. Functional Descriptions of EZCT-2000C Controls and Indicators Item Number Panel Markings^ Functional Description
1
INSULATION RESISTANCE METER
Insulation resistance meter connectors.
2-6 X1, X2, X3, X4, X
Current transformer excitation voltage connectors. Each set of connectors contains a test voltage connector and sensing connector. 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. 7 H Current transformer primary input test cable connectors. (^8) GROUND Grounding stud. 9 AC receptacle. 10 100-120Vac, 12A50-60Hz Power switch with built-in circuit breaker.
11 Back-lit graphic LCD screen (128 x 64); viewable in bright sunlight and low lightlevels.
12 HIGH VOLTAGEPRESENT LED warning indicator that is illuminated when high voltage is present. 13 Rugged, "QWERTY"-style membrane keypad
14
EMERGENCY TURN OFF “PUSH”
Emergency turn off switch.
15 Built-in 4.5-inch wide thermal printer 16 USB PC USB PC interface. 17 USB MEM USB Flash drive interface
18
AC CURRENT SOURCE 0 – 20A
AC current source connectors (EZCT-2000C Plus Only)
19 BLUETOOTH Bluetooth indicator (Optional)
REV 1 EZCT-2000C USER’S MANUAL
2.0 PRE-TEST SETUP
2.1 Operating Voltages
The EZCT-2000C’s operating voltage is preset at the factory for 100-120 Vac, 50/60 Hz or 200- 240 Vac, 50/60 Hz.
2.2 LCD Screen Contrast Control
To increase the LCD screen contrast, press and hold the [∧] key for two seconds. Release the button when the desired contrast level has been reached.
To decrease the LCD screen contrast, press and hold the [∨] key for two seconds. Release the button when the desired contrast level has been reached.
2.3 Printer Paper Control
To advance the thermal printer paper, press and release the [∧] key.
To retract the thermal printer paper, press and release the [∨] key.
2.4 Printer Paper
The EZCT-2000C’s built-in thermal printer uses 4.5-inch wide thermal paper for printing test results. To maintain the highest print quality and to avoid paper jams, the use of thermal paper supplied by Vanguard Instruments Company is highly recommended. Additional paper can be ordered from the following sources:
Vanguard Instruments Co, Inc. 1520 S. Hellman Avenue Ontario, CA 91761 Tel: 909-923- Fax: 909-923- Part Number: TP4-CS (24 rolls) or TP4-3R (3 rolls)
BG Instrument Co. 13607 E. Trent Avenue Spokane, WA 99216 Tel: 509-893- Fax: 509-893- Part Number: VIC TP-4 paper
REV 1 EZCT-2000C USER’S MANUAL
3.0 OPERATING PROCEDURES
3.1 EZCT-2000C Cable Connections
Always connect the EZCT-2000C to the substation ground before connecting any test cables. The EZCT-2000C is supplied with five 20-foot X test cables and one 35-foot H cable. The X cable connections are required to run the current transformer excitation test. The H and X cable connections are required to run the transformer turns-ratio test. A typical excitation and ratio test connection is shown in Figure 2. The insulation resistance test connection is shown in Figure 3. The burden test connection is shown in Figure 6. The current source test connection is shown in Figure 7. Transformer bushing CT connections for Delta and Y transformers are shown in Figure 8 and Figure 9, respectively.
Figure 2. Typical EZCT-2000C Excitation and Ratio Test Cable Connections
EZCT-2000C USER’S MANUAL REV 1
Figure 3. Connections for a typical high resistance measuring application
Figure 4. Connections for a typical insulation resistance measurement for a CT with 5 terminals
EZCT-2000C USER’S MANUAL REV 1
Figure 6. EZCT-2000C CT Burden Test Cable Connection (EZCT-2000C Plus Only)
REV 1 EZCT-2000C USER’S MANUAL
Figure 7. EZCT-2000C Typical Current Source Connection (EZCT-2000C Plus Only)