220~750 kV电网线路后备保护整定配合探讨

随着220~750 kV电网线路主保护的加强,业界关于后备保护整定配合的争议越来越多。为了解决后备保护整定配合问题,介绍了高压电网线路后备保护配合整定在现场的几种常用整定方法,分析了不同整定配合方案考虑的原因。针对接地距离测量阻抗受零序补偿系数的影响,分析了接地距离保护整定中需要特殊考虑的问题。通过对高压电网线路后备保护作用分析以及实际案例验证,推荐了一种高压系统后备保护的整定计算方法。

Discussion on the coordination of backup protection relay settings in the 220~750 kV network

As the primary protection of the 220~750 kV network strengthens, there are more controversy to relay coordination of backup protection in power industry. To solve the problem, this paper mainly introduces several common installation methods used in the field about backup relay coordination in high voltage power network, and analyzes the reasons of different relay coordination schemes. In view of grounding distance measuring impedance under the influence of zero sequence compensating coefficient, the special consideration in grounding distance protection setting is discussed. Furthermore, through the analysis of high voltage power network backup protection and verification of actual case, a setting calculation method used in high voltage system backup protection is recommended.