![]() ![]() Apply the two three-phase voltage inputs for over- and undervoltage, frequency, and volts/hertz protection. Detect turn-to-turn winding faults for as little as two percent of the total transformer winding with the negative-sequence differential element. ![]() Use the three independent restricted earth fault (REF) elements for sensitive ground-fault detection in grounded wye-transformer applications. SEL-487E-3, -4 Transformer Differential Relay Three-Phase Transformer Protection, Automation, and Control System Major Features and Benefits The SEL-487E Transformer Differential Relay provides three-phase differential protection for transformer applications with as many as five three-phase restraint current inputs.
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