基于站域集成的暂态电流极性比较保护方案

Transient Current Polarity Comparison Scheme Based on Substation Integrated Protection

提出一种基于站域保护的暂态电流极性比较的保护方案。该技术运用安装在配电网中每个变电站中专门设计的集成保护继电器,实现检测、分析处理因故障产生的暂态电流信号。通过集成继电器检测出因故障产生的故障电流分量信号,运用暂态电流极性识别算法来检出信号的极性;之后,通过比较来自与站点相连接的所有线路上的电流信号的极性就可以确定故障的方向;最后,通过对比来自网络中各站点的方向信息便可以确定故障的线路。通过仿真证明该方案是切实可行的。

A transient current polarity comparison scheme based on substation integrated protection for distribution networks is presented. The technique is based on the detection and processing of fault generated transient current signals, in which specially designed integrated protection relays are installed at each substation of a distribution network. The relay detects the fault generated super-imposed current signals. The transient current polarity identification algorithm is then applied to the super-imposed signals to identify the polarity of the signal detected. The direction of a fault is determined by comparison of the polarity of the signals derived from all the line sections connected to the station. The actual fault line section is identified by comparing the directional information from all stations within the protected area. Simulation results presented demonstrate the feasibility of the scheme.