The Vector Shift and ROCOF protection relay is designed for applications where a generator is running parallel with a mains supply either from a utility or other generators. The relay will detect disconnection of a generator from the network, (islanding of an embedded generator) and trip the generator’s circuit breaker.

It is specifically designed to protect the mains from the potential damaging effects of reconnection whilst out of synchronizm, and the supply of power to local lines without authority. The relay is available in two case styles, both of which simultaneously sense Vector shift and a Rate Of Change Of Frequency (R.O.C.O.F) as measurement parameters in compliance with G.59/1 and ETR 13. For optimum safety each generator should have its own Vector Shift and ROCOF protection relay.

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