The Vanguard EZCT series of current transformer testers can perform excitation tests as specified by the ANSI/IEEE C57.13.1, IEC 60044-1 methodology. These testers apply a variable AC test voltage to the current transformer’s secondary windings. The EZCT then records the test voltage and excitation voltage injected to the CT during the test. The EZCT testers also have a built-in thermal printer that lets you plot up to 10 knee-point voltages and excitation curves. The testers can also calculate and print out IEEE-30, IEEE-45, ANSI/IEC 60044-1 knee-point voltages.
Current transformers can be tested in their field-mounted configuration, eliminating the need to remove bushings or current transformers from the host equipment. The Vanguard EZCT is capable of outputting 50 Vac at 2A and 200 Vac at 2A.
The Vanguard 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.
Test voltage output is automatically raised and lowered by the Vanguard EZCT-2000 without any operator intervention. With up to 2000 Vac excitation test voltage available, the Vanguard EZCT-2000can easily perform excitation tests on very large CT’s.