Patent ID: 9007734
Filing Date: 2015-04-14
Classification: H02H

Abstract:
1. A method for monitoring a busbar in an electrical power supply system for an occurrence of short circuits, wherein: the busbar has a feeder and at least two outgoers; an outgoer protective device is provided on each outgoer for monitoring the respective outgoer for shorts; and a feeder protective device is provided on the feeder for monitoring the busbar for shorts; and the method which comprises: on occurrence of a short in one of the outgoers, transmitting a blocking signal from the outgoer protective device associated with the respective outgoer to the feeder protective device, the blocking signal delaying or blocking a tripping of a circuit breaker connected on the feeder; repeatedly sending communication messages via a data transmission bus from the outgoer protective devices to the feeder protective device; checking a reception of the communication messages with the feeder protective device; with the feeder protective device, classifying an outgoer protective device as being faulty from which no communication messages are received within a defined time period, while communication messages have been received from at least one other outgoer protective device during the defined time period; and if at least one outgoer protective device is classified as faulty, preventing an issuance of the blocking signal with the feeder protective device.