BREAKER STATUS FOR BB & AR

1. The Breaker ready status for Busbar Low impedence relay should be coming from Aux relay. This Aux relay should enable only through SF6 low stage -2 ( Trip block ). No need spring charge and close block ( SF6 low stage -1).

 2. The Breaker ready status for AR should be coming from a Aux relay. This Aux relay should enable only through SF6 low stage -1 ( Close block ) and Spring not charge contact . No need SF6 low stage -2 contacts.

ISOLATIOR STATUS REB 500

 

For REB 500 ABB relay isolstor status contact should be Early make and late breake