The Vanguard EZCT-2000A Automated CT Test Set is a microprocessor-based Current Transformer Test Set capable of performing Current Transformer (CT) excitation test, measure the CT current-ratio and polarity and CT winding resistance automatically.
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 Vanguard EZCT-2000A Automated CT Test Set.. 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.
CT Ratio and Polarity Test
The Vanguard EZCT-2000A Automated CT Test Set 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.
CT Winding Resistance Test
The Vanguard EZCT-2000A Automated CT Test Set 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.
All of the EZCT-2000A ’s test leads can be connected to the CT output terminals, 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.
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