沟通三跳接点引起的断路器控制回路隐性故障及其改进措施

Hidden Failure of Circuit Breaker Control Circuit Caused by GST Connection and Its Improvement Measures

摘要:

断路器控制回路断线是严重危及电网安全运行的危急缺陷，其隐性化发展使得断路器拒动概率增加。断路器保护的沟通三跳接点作为断路器保护重合功能的一部分，在特殊情况下会使得断路器出现控制回路断线无法告警的隐性故障。通过实际案例分析研究断路器保护沟通三跳接点的二次回路设计、原理及其作用，提出了该隐性故障产生的机理和发展过程；最后，对该隐性故障产生的充分条件针对性地提出了改进措施。

Abstract:

The disconnection of breaker control circuit is a critical defect that seriously endangers the safe operation of power grid, and its hidden development increases the probability of circuit breaker refusing to operate. As a part of the reclosing function of breaker protection, GST connection will cause the circuit breaker to have a hidden failure in which the control circuit is disconnected and cannot be alarmed under special circumstances. The design, principle and function of secondary circuit of GST connection in breaker protection are analyzed and studied through practical cases. Finally, the improvement measures are put forward according to the sufficient conditions for hidden failure.