配电网故障处理若干问题探讨

为了提高配电网的故障处理性能，对配电网故障处理过程进行了归纳。对配电网继电保护配置、就地型馈线自动化改进以及单相接地故障处理等问题进行深入研究，指出配电网继电保护不必追求完美配合，只要效果明显就值得配置。论述了一种基于合闸速断方式的就地智能馈线自动化的改进方法，实例表明其不仅可以显著加快相间短路故障处理速度而且可以做到免整定。论述了智能接地配电系统的组成和工作原理，讨论了暂态过程抑制、选相容错纠错和单相接地选线定位与隔离等关键技术的实现方法。

Investigation on fault processing for electric power distribution networks

To improve the performance of fault processing in distribution networks, the tasks of fault processing are summarized. Some problems, such as relay protection for distribution systems, improvement of local intelligence feeder automation and single phase grounding fault processing, are deeply investigated. It is pointed out that there is no need for perfection of relay protection for distribution systems and that a relay protection may be installed as long as it being effective. An improved local intelligence feeder automation based on over-current protection during closing period is put forward, the instance of which, showing that not only is the fault processing time reduced remarkably, but also the setting may be fixed. The structure and principle of a smart grounding distribution system is described. The realization of some key technologies, such as electromagnetic transient suppression, modification for phase-selection mistake, location and isolation of single phase grounding faults, are discussed in detail. This work is supported by Science and Technology Project of State Grid Corporation of China (No. 5226SX1600U9).