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I have two 6FA Machines each machine attached to 132kV 100MVA transformers having breaker 52L. during the grid disturbance, 52L breaker opens due to RoCoF (rate of change of frequency) setting in MARK VI. with opening of 52L breaker, Generator circuit breaker 52 G also gets open. what could be the possible reason as i'm stuck could not find out any possible reason?
there is no tripping on generator protection relay.
No tripping on main power transformer protection relay.
machine island mode is not selected.
there is no tripping on generator protection relay.
No tripping on main power transformer protection relay.
machine island mode is not selected.