EZCT 2000B Current Transformer Saturation, Ratio and Polarity Test Set

The EZCT-2000B is Vanguard’s third-generation microprocessor-based current transformer test set. Designed specifically for CT testing, the EZCT-2000B 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
• Measures insulation resistance and winding resistance of the CT secondary windings
• Measures the CT’s secondary burden
The EZCT-2000B’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.

Saturation Test
The CT saturation 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 saturation test. The test voltage is raised and lowered automatically by the EZCT-2000B. The saturation test voltage and current data is collected and
stored in the EZCT-2000B’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-2000B’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 saturation 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.

CT 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 displayed as a “+” sign (in-phase) or a “-” sign (out-of- phase) and is annotated with the phase angle in degrees. The CT currentratio
error and phase displacement is also calculated based on the CT burden (or rated power) and rated current.

CT Winding Insulation Resistance Test
The EZCT-2000B 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-2000B can measure the CT’s secondary burden by injecting a 1A or 5A test current into the load. The CT burden measurements (Voltage, current, Cosϕ, and burden impedance) are displayed on the screen and printed on the test report. This important test verifies the actual CT burden before putting the
CT in service, thus avoiding any potential configuration conflicts.

Current Source
The EZCT-2000B’s programmable current source (0-20A, 0-15Vac) can be used to verify CT loads. The on-time timer and output current are displayed on the LCD screen.

User Interface and Display
The EZCT-2000B features a back-lit LCD screen (240 x 128 dot graphic) that is clearly viewable in both bright sunlight and low-light levels. An alpha-numeric keypad is used to enter test information and to control the unit’s functions.

Thermal Printer
A built-in 4.5-inch wide thermal printer can print the current transformer test report and plot the excitation curves.

Internal Test Record Storage Capacity
The EZCT-2000B can store up to 140 test records in Flash EEPROM. Each test record may contain up to 10 saturation curves, burden test reports, current ratio readings, and polarity and DC resistance readings. Test records can be recalled and printed by the built-in thermal printer. Test records can also be transferred to a PC using the RS-232C port, USB port, or via the USB Flash drive interface port.

External Data Storage
The EZCT-2000B 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 plans between a computer and the EZCT-2000B without the need to connect the unit to the computer.

Computer Interface
The EZCT-2000B can be used as a stand-alone unit or can be computer-controlled. It can be connected to a PC via the standard RS-232C or USB port. In computer-controlled mode, test records can be downloaded from the EZCT-2000B’s memory, or CT tests can be run from the PC. A Windows® XP/Vista-based
Current Transformer Analysis software application is provided with the EZCT-2000B and can be used to transfer test records from the EZCT-2000B to a PC.
Test plans can also be created with the provided software. Additionally, tabulated test records can be exported to Microsoft® Excel®.

SPECIFICATIONS

Portable current transformer test set
19”W x 13”H x 15,8”D (48.3 cm x 33 cm x 40.1 cm); Weight: 73 lbs (33,1 kg)
100 – 120 Vac or 200 – 240 Vac (factory pre-set), 50 Hz/60 Hz
ANSI/IEEE C57.12.90, IEC 60044-1  and ANSI/IEEE C57.13.1
TEST OUTPUT VOLTAGE
0 – 50 Vac @ 10A max, 0 – 300 Vac @ 10A max
0 – 500 Vac @ 5A max, 0 – 1200 Vac @ 1.2A max, 0-2000Vac @ 1A max
CURRENT SOURCE
1-20A @ 15Vac
VOLTAGE AND CURRENT READING
0 – 2,200 Vac; Accuracy: ±1.0% of reading, ±1 volt
0 – 10A; Accuracy: ±1.0% of reading, ±0.02A
CT CURRENT RATIO RANGE
0.8 – 999: 0.1%, 1000 – 1999: 0.3%, 2000 – 5000: 1%
0 - 360 degrees; Accuracy: ±1.0 degree
RESISTANCE READING RANGE
100micro-ohms - 10ohm, Accuracy: ±3.0% of reading, 500-1000V test voltage
INSULATION RESISTANCE READING RANGE
2 Mega-ohms - 500 Mega ohm, Accuracy: ±2.0% of reading, ±1 count

Back-lit LCD Screen (240 x 128 dot graphic; 114mm x 64mm); viewable in bright sunlight and low
light levels
Built-in 4.5-inch wide thermal printer
One RS-232C port (115k baud), one USB port, one USB flash drive port
Windows®  XP/Vista-based CT Analysis software is included with purchase price
Stores 140 test records. Each test record may contain up to 10 sets of saturation, current selections, DC resistance, polarity  and ratio data
Stores 128 test plans. Each test plan consists of the saturation test voltage and current settings and terminal combinations (X1 to X5)
Designed to meet UL 61010A-1  and CAN/CSA C22.2 No. 1010.1-92   standards
Operating: -10˚ to 50˚ C (15˚F to +122˚ F); Storage: -30˚ C to 70˚ C (-22˚F to +158˚ F)
90% RH @ 40˚C (104˚F) non-condensing
2,000m (6,562 ft) to full safety specifications
Five 20-foot X cable sets, One 35-foot H cable set, power cord, insulation test cables, ground cable. One transportation case

WARRANTY
One year on parts and labor

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