浅析变电站继电保护死区及改进

Analysis of Dead Zone and Improvement of Relay Protection in Substation

电力配电设备中的电流、电压互感器、断路器等一次控制设备,配合二次继电器、综合保护装置等控制设备,在线路运行过程中,能够对线路的过负荷、击穿短路、系统接地、系统过电压等运行异常或运行事故及时准确地进行保护控制。但是,某些保护控制设计中存在保护死区,如果出现故障,保护功能无法发挥应有的作用,将给电力系统带来较大的经济损失,甚至影响上一级的供电保护系统。文章结合变电站前期设计及实际现场发现的保护缺陷问题,分析其保护原理及问题,并给出解决方法。

In the power distribution equipment,such as current,voltage transformer,circuit breaker and other control equipment and the secondary relay,integrated protection devices and other control equipment can control the overload,breakdown,short circuit,system grounding,system overvoltage and other abnormal operation or operation accident timely and accurately. However,there are protection dead zones in some protection control designs. If there is a failure,the protection function cannot play its due role,which will bring great economic loss to the power system and even affect the power supply protection system at the upper level. In this paper,combined with the pre-design of the substation and the protection defects of the actual site,the paper analyzed the protection principle and the problem,and gave the solution.