• Perform Saturation, Ratio and Polarity Tests
• Perform CT Winding Resistance Test
• Fully Automated
• Test record header information including company, substation name, circuit ID, manufacturer, CT serial number, operator name, and test record-comments
• Plot Multiple Saturation Curves
• Store 140 Records (of 10 Saturation Curves)
• Computer Interface
• USB Flash drive interface

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

Demagnetization

The EZCT-2000A automatically demagnetizes

the CT under test when performing an excitation

test.

Winding Resistance Test

The EZCT-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.

CT Ratio and Polarity

Tests

The EZCT-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.

User Interface and

Display

The EZCT-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.

Part number EZCT-2000A EZCT-2000A, cables, and PC software

Part number EZCT-2000A-CASE EZCT-2000A shipping case

Part number Paper-TP4 thermal printer paper