Both the primary breaker and Feeder Breaker 1 will see this fault. When ZSI is used, the feeder breaker will send a restraint signal to the principle breaker, instructing it to attend to permit the feeder breaker to operate. The feeder breaker will trip while the bus stays operational. Conversely, if the upstream breaker sees the fault and the downstream breaker does not , the feeder breaker doesn’t send a restraint sign and the main breaker trips shortly.
This software offers nice options and easy to make use of interface...Read More