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Generator Digital Protection (DGP) relay lockout lost its memory.
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A ground fault occured on the generator but the lock out relay failed to operate. The step up transformer relay operated to trip the Generator. What could be the cause of the lock out relay from operating?

The dc breaker to the Generator relay was accidentally opened after the trip. This caused a loss of memory to Generator relay. Is it possible to lose the memory on the relay and what can be done to retrieve the lost memory?

Thank s.