一种3 2接线死区故障隔离与误切元件快速恢复方法

在现有3/2接线方式下，由于保护和互感器的配置并未完全交叉，导致死区的存在。在发生死区故障时，一般由死区故障所在间隔保护以及断路器失灵保护动作相互配合以实现故障的彻底隔离。这种做法会使得断路器的切除范围扩大，甚至会导致正常母线不必要的停运，严重影响系统的安全稳定运行。针对上述问题，分析了在不同保护CT配置方式下的死区故障的特点，提出了一种死区故障隔离与误切元件快速恢复的方法。该方法通过引入断路器的开合状态信息来有效地辨别死区故障和断路器失灵情况，同时利用断路器的重合闸功能，快速恢复切除死区故障时的误切断路器，从而显著提高系统的安全稳定运行水平。

A method for dead zone fault isolation and fast recovery of error cutting element under the existing 3/2 connection mode

Under the existing 3/2 connection mode, the configuration of the protection and transformer is not completely crossed which causes the existence of the dead zone. When the fault occurs in the dead zone, line protection and breaker failure protection are generally matched with each other to achieve the complete isolation of the fault. This approach will make the scope of the circuit breaker to expand, and even lead to unnecessary outage of the normal bus. So it seriously affects the safe and stable operation of the system. In view of the above problems, this paper analyzes the characteristics of the dead zone fault under different protective CT configuration modes, and provides a method for dead zone fault isolation and fast recovery of error cutting element. Thereby this paper introduces circuit breaker opening and closing state information to effectively identify dead zone fault and the breaker failure. At the same time, based on the information sharing in the station area, the circuit breaker can be quickly recovered by using the reclosing function of the circuit breaker, which can significantly improve the safe and stable operation level of the system.