POWER FACTOR/CAPACITANCE AND INSULATION RESISTANCE TESTING ISSUES ON 138 KV DRY TYPE CT

This month’s Featured Technical Paper is from the Proceedings of the 2024 International Conference of Doble Clients. The paper is titled: Power Factor/Capacitance And Insulation Resistance Testing Issues On 138 KV Dry Type CT.

Abstract

Metering current transformers (CTs) are tested before and after installation. Important parts of the test program are power factor/capacitance testing and insulation resistance testing. There are three issues that have occurred during pre- and post- on-site testing on 138 kV dry type metering CTs. An investigation was carried out to determine the root causes of these issues. Simulation tests were performed to determine these root causes. Results from this investigation not only provide technical information, but also support recommended testing configurations for future testing on this design of dry type CTs.

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