In electrical protection and metering, what is the function of a Current Transformer?

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Multiple Choice

In electrical protection and metering, what is the function of a Current Transformer?

Explanation:
Current transformers step down the current on a live circuit to a safe, proportional level that meters and protective relays can read. This scaled signal lets protection schemes detect faults and meters report load without exposing measurement gear to high current or voltage. Isolation between the high-energy circuit and the measurement/control circuitry is a beneficial side effect, but the primary function for protection and metering is to measure the current. Measuring voltage would require a potential transformer, and storing energy is not a function of a current transformer.

Current transformers step down the current on a live circuit to a safe, proportional level that meters and protective relays can read. This scaled signal lets protection schemes detect faults and meters report load without exposing measurement gear to high current or voltage. Isolation between the high-energy circuit and the measurement/control circuitry is a beneficial side effect, but the primary function for protection and metering is to measure the current. Measuring voltage would require a potential transformer, and storing energy is not a function of a current transformer.

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