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sf6 Load break switch transformer maintenance Recovery of Polluted rental

TOP 250+ Switchgear Interview Questions and Answers 17 ... the fault occurs very near to the neutral point of the transformer, the voltage available to drive the earth circuit is very small, which may not be sufficient to activate the relay, unless the relay is set for a very low current. Hence the zone of protection in the winding of the transformer is restricted to cover only around 85%.

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