• measurement method ANSI/IEEE C57.12.90, IEC 60044-1 and ANSI/IEEE C57.13.1
• output test voltages 0..50 Vac @ 10A max; 0 – 200 Vac @ 10A max; 0 – 1200 Vac @ 1.5A max (5 min on, 10 min off)
• voltage reading range 0..1,250 Vac
• current reading range 0..10A
• current ratio range 0.8..99: ±0.5%, 100..999: ±1.0%, 1,000..5,000: ±2%
• phase angle measurement 0..360 degrees
• Perform Saturation, Ratio and Polarity Tests
• Fully Automated
• Comprehensive Graphic and Tabulated Test Reports
• Plot Multiple Saturation Curves
• Store 64 Records (of 10 Saturation Curves)
• Computer Interface & pc software

The Model EZCT-10 is a microprocessor-based, current-transformer test set. This rugged and portable test set measures excitation current, turns ratio and winding polarity on single- and multi-ratio current transformers. Current transformers can be tested in their field-mounted configuration, eliminating the need to remove bushings or current transformers from the host equipment.

The EZCT-10 uses a heavy-duty transformer to perform the CT excitation test. It is capable

of outputting 50 Vac at 10A and 200 Vac at 10A.

Excitation Test

The CT excitation test is performed using the

ANSI/IEEE C57.13.1, IEC 60044-1 test method.

The EZCT-10 applies an AC variable test voltage

(up to 1,200 Vac) to the CT’s secondary windings.

The EZCT-10 records and displays the test

voltage and excitation current applied to the

current transformer during the excitation test.

Once tests are completed, up to 10 excitation

curves and knee-point voltages of the tests can

be plotted on the built-in thermal printer. IEEE-

30, IEEE-45, ANSI/IEC 60044-1 (10/50) knee

point voltages are also calculated and printed

on the test report.

User Interface

The EZCT-10 features a back-lit LCD screen (4

lines by 20 characters) that is viewable in both

bright sunlight and low-light levels. A rugged,

alpha-numeric, membrane keypad is used to

enter test information and to control the unit’s

functions, and a voltage control knob is used to

control the variable test voltage output. The test

voltage range (50V at 10A, 200V at 10A, 1,200V

at 1.5A) is selected with a switch on the control

panel.

Built-in Thermal Printer

A built-in 4.5-inch wide thermal printer can print

the current transformer test report and plot the

excitation curves.

CT Ratio and Polarity

Tests

The EZCT-10 determines the CT current-ratio

using the ANSI/IEEE C57.12.90 measurement

method. A test voltage is applied on the CT’s

X terminals and the induced voltage is measured

across the CT’s H1 and H2 terminals. The

current-ratio is displayed on the screen and

stored in memory. The current-ratio measuring

range is from 0.8 to 5,000. Winding polarity is

displayed as a “+” sign (in-phase) or “-” sign

(out-of-phase) and is annotated with the phase

angle in degrees.

Internal Test Record Storage

The EZCT-10 can store up to 128 current-transformer

test records in Flash EEPROM. Each test

record may contain up to 10 excitation curves,

polarity, and current-ratio test data sets. Test records

can be recalled and printed on the built-in

thermal printer.

Computer Interface

The EZCT-10 can be used as a stand-alone unit

or can be computer-controlled via the built-in

RS-232C or USB interfaces. Windows®-based

Current Transformer Analysis software is provided

with each EZCT-10. This software can be

used to retrieve test records from the EZCT-10

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.

Part number EZCT-10 EZCT-10, cables, and PC software

Part number EZCT-10-CASE EZCT-10 shipping case

Part number Paper-TP4 thermal printer paper