220 kV保护死区问题的探讨及改进

Discussion and improvement about the question of 220 kV protection′s dead-zone

在继电保护的设计、施工、调试等实践工作中,有时因为疏忽导致保护死区的产生。该文简要分析了在现场接线中存在的几种常见的保护死区故障,即:各类断路器与断路器电流互感器之间的死区故障。简单介绍了几种保护死区故障产生的原因,针对这几个问题提出了几种解决保护死区的方法,并强调了在处理这些问题时应该引起高度重视的相关注意事项。

In the design, construction and debugging work of relay protection, protection dead-zone happens because of careless operation. In this paper, several common protection dead-zones that exist in the spot connection are analyzed briefly, including faults between circuit breakers and CT of circuit breaker. Reasons of several dead-zone protection fault are analyzed. Several methods to settle protection dead-zone are put forward.