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1. High impedance differential relays use circulating current principles to detect faults within a protection zone. They rely on balanced currents from current transformers (CTs) to produce minimal operating current through the relay under normal conditions. 2. When an internal fault occurs, the sum of currents flowing in does not equal the sum of currents flowing out. This differential current must flow through the relay path to operate it. 3. For stability, the relay pickup voltage must be less than ha

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Anonymous UkDR2FBHTc

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EN