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Introduction to Power System Protection
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Power system protection systems have three basic components: Instrument transformers, Relays, Circuit breakers
The function of the CT is to reproduce in its secondary winding a current I’ that is proportional to the primary current I. The CT converts primary currents in the kiloamp range to secondary currents in the 0–5 ampere range for convenience of measurement.
The function of the relay is to discriminate between normal operation and fault conditions. The OC relay in Figure 2 has an operat...
The function of the CT is to reproduce in its secondary winding a current I’ that is proportional to the primary current I. The CT converts primary currents in the kiloamp range to secondary currents in the 0–5 ampere range for convenience of measurement.
The function of the relay is to discriminate between normal operation and fault conditions. The OC relay in Figure 2 has an operat...