Current Transformer Test Set AEZCT 2000A

Current Transformer Test Set AEZCT 2000A

The AEZCT-2000A is Amperis’ third-generation microprocessor-based current transformer test set. The AEZCT-2000A can perform the current transformer (CT) excitation test, measure the CT winding resistance and CT current-ratio automatically. All of the AEZCT-2000A’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 AEZCT-2000A without any operator intervention. With up to 2000 Vac excitation test voltage available, the AEZCT-2000A 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 AEZCT-2000A. 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.


The AEZCT-2000A automatically demagnetizes the CT under test when performing an excitation test.

User Interface and Display

The AEZCT-2000A features a back-lit LCD screen (240 x 128 pixels) that is viewable in both bright sunlight and low-light levels. A rugged, alphanumeric, membrane keypad is used to control the unit.

Ratio and Polarity Tests

The AEZCT-2000A 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 5,000 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.

Winding Resistance Test

The AEZCT-2000A can also measure the DC resistance of the CT winding under test. The DC winding resistance measuring range is from 100 micro-ohms to 10 ohms.

Thermal Printer

A 4.5-inch wide built-in thermal printer can print the CT test results and excitation curves.

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 AEZCT-2000A 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 AEZCT-2000A. This software can be used to retrieve test records from the AEZCT-2000A, create test plans, download test plans to the AEZCT-2000A, 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.

Internal Test Record Storage

The AEZCT-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.

Internal Test Plan Storage

The AEZCT-2000A 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 AEZCT-2000A is connected to the CT terminals and a test plan is simply selected and run. Test plans can be created on the AEZCT-2000A itself or created on a PC and downloaded to the AEZCT-2000A via the unit’s built-in RS-232C or USB interfaces.

External Data Storage

The AEZCT-2000A 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 AEZCT-2000A without the need to connect the unit to the computer

AEZCT-2000A’s Specifications


Portable current transformer test set

Physical specifications

17"W x 12½"H x 14"D (42.7 cm x 32cm x 35.6 cm); Weight: 60 lbs (27.2 kg)

Input power

100 ¬ 120 Vac or 200 ¬ 240 Vac (factory pre-set), 50/60 Hz

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 - 300 Vac @ 10A max; 0 - 500 Vac @ 5A max; 0 - 1200 Vac @ 2A max; 0 - 2000 Vac @ 1.2A max

Voltage reading range

0 - 2,200 Vac; Accuracy: ±1.0% of reading, ±1 volt

Current reading range

0 - 10A; Accuracy: ±1.0% of reading, ±0.02A

Current ratio range

0.8 - 999: 0.1%, 1000 - 1999: 0.3%, 2000 - 5000: 1%

Phase angle measurement

0 - 360 degrees; Accuracy: ±1.0 degree

Resistance reading range

100 micro-ohms ¬ 10 ohms; Accuracy: 2% of reading, ±1 count, ±10 micro-ohm


Backlit LCD Screen (240 x 128 pixels; 114mm x 64mm); viewable in bright sunlight and low-light levels


Built-in 4.5-inch wide thermal printer

Computer interfaces

One RS-232C port, one USB port

External data storage

One USB Flash drive interface port (Flash drive not included)

PC software

Windows®-based CT Analysis software is included with purchase pric

Internal test record storage

Stores 140 test records. Each test record may contain up to 10 sets of excitation, resistance and ratio data

Internal test plan storage

Stores 128 test plans. Each test plan can store 10 excitation test voltage and current settings


Designed to meet UL 6101A-1 and CAN/CSA C22.2 No 1010.1-92 standards


Operating: -10°C 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


2,000 m (6,562 ft) to full safety specifications


Five 20-foot X cable sets, one 35-foot H cable set, power cord, one cable-carrying duffel bag


One year on parts and labor

NOTE:the above specifications are valid at nominal voltage and ambient temperature of +25°C (+77°F). Specifications are subject to change without notice

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