防止反向故障误动的自适应距离继电器

Adaptive distance relay for preventing error action of reactive fault

反向经过分支支路时产生的故障对距离保护有所影响,结合实用的四边形继电器特性对这种故障情况进行了分析。通过分析不同条件情况下继电器的误动情况,给出了解决方案,提出了自适应判据。通过仿真计算表明,这种继电器有很好的自适应性和选择性,能防止误动,具有广阔的推广应用前景。

Impedance between faulted line and ground was generally regarded as a resistance,but in some eases the equivalent impedance ean be reaetive. The impedanee loei with fault impedanee seen by the proteetion in this eondition was analyzed. Based on different real-operation of relay, the solution scheme was given and an adaptive criterion was proposed. The simulation results show that the new adaptive relay has excellent adaptablity and selectivity, can prevent error action, illustrates a good prospect of application and extension.