Which types of testing are typically conducted on current transformers in the field?

Current transformers (CTs) are essential components in power systems, used for measurement and protection purposes. The correct answer, which highlights the types of testing typically conducted on current transformers in the field, focuses on primary and secondary testing.

Primary testing involves applying a known primary current to the current transformer to evaluate its performance characteristics accurately. This allows technicians to assess the accuracy of the current transformation, ensuring that the CT provides the correct output under actual load conditions. Measurements taken during primary testing help to validate the transformer's operational integrity.

Secondary testing, on the other hand, refers to assessing the output of the CT when a secondary current is fed into it. This type of testing is crucial for verifying the ratio and burden performance of the CT, ensuring it operates correctly within its specified range. It is often simpler to conduct and provides insights into the operational condition of the CT without the need for high-voltage systems.

Together, primary and secondary testing enables comprehensive evaluation of the current transformer, ensuring it meets safety and performance standards crucial for reliable power system operation.