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directional relay is typically used to respond in fault
condition who it can be used just as reverse power
protection which purely senes direction reversal to operate
a circuit breaker?
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In other words ,directional relay is employed for
tranmission lines when there are two or more parallel
feeders ,so that the heathy feeder does not trip due to the
fault in another feeder.It is also used when the
tranformers are in parallel operation to prevent reverse
power ,when the secondaries are in prallel
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