基于联锁的110kV区域电网线路保护原理及其应用

Interlock-based line protection principle and its application in 110kV regional grid

针对110kV电网的特点,分析了阶段式距离保护在多级线路结构的电网中逐级配合困难的问题,提出了基于联锁的区域电网线路保护原理。该保护原理结合了本线路距离保护和线路对侧变电站的母线电流差动保护、线路距离保护的故障判别结果,从而实现全线范围的快速动作后备保护功能。该保护原理集成于区域保护与控制系统中,通过站域保护设备之间的动作信息发布/订阅,实现了基于联锁的区域电网线路保护功能。基于该原理的区域保护与控制系统已通过仿真测试并投入试运行,其原理的正确性得到了验证。

The difficulty of coordination among cascaded distance protections in multilevel grid is analyzed according to the characteristics of 110kV power grid and an interlock-based protection principle is proposed for the line protections of regional grid,which combines the fault identification result of own-side line distance protection with those of opposite-side bus current differential protection and line distance protection to realize the instant backup protection function for whole transmission line. Integrated into the regional protection and control system,it publishes and subscribes the action information among the protective equipments of different substations to realize the interlock-based regional line protection function.The regional protection and control system based on the proposed principle has passed the simulative test and put into trial operation,validating its correctness.