Inverse time overcurrent relays operate based on the principle that the tripping time is inversely proportional to the fault current magnitude. This means that for higher fault currents, the relay trips faster, and for lower fault currents, it trips slower. A high impedance fault is a fault where the fault current is limited by a high impedance, such as when a conductor falls to the ground through a tree or makes contact with a poorly grounded object. The primary li....
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