If a fault occurs at the generator, the current will flow through the transformer and current will circulate through the C.T.s circuits in the same direction, however, no current will flow through the Differential relay (pictured here as an Ammeter). This would allow the generator protection to open the breakers and disconnect the generator but keep the transformer breaker closed. This would be important if another generator was connected to the same transformer.
Posted by Scott
Wednesday, July 27, 2005
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