This paper will discuss testing methods for current transformers (CT) during routine maintenance. The current method recommended by Doble [1] is to disconnect the CT secondary side, which requires additional effort when there are labor shortages. Also, the authors will share an inadvertent outage that impacted several customers when a circuit breaker tripped by the electrical protection during an insulation test on a current transformer. A new test method has been investigated and should be implemented into a test program when performing a test on a current transformer.
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