A New Principle of Breaker Failure Protection Based on Station Information Sharing

Abstract

In the case of terminal fault of long line, the failure protection of traditional circuit breaker has the problem of refusing to operate due to the insufficient sensitivity of voltage locking elements. A new circuit breaker failure protection scheme based on station area information sharing is proposed in this paper. The new scheme will replace the protection export signal with the actual protection criterion. In addition, it sets up two current transformers to detect whether the breaker is cut off after the circuit breaker is cut off, and checks the redundant current of the bus, which can improve the accuracy of the current detection. Besides, it uses reclosing checkout voltage device signal to supplement the original compound blocking signal. Theoretical analysis and simulation results show that the scheme can effectively cover the full length of the transmission line and has high reliability.