配电网区域保护原理研究与实施

Research and Implementation of the Regional Protection Principle in the Distribution Network

本文提出配电网区域保护的原理,即借助于对等式通信使不同地点智能终端能够在毫秒级时间内进行协调,实现了保护的快速性和选择性的统一,解决了配电系统中短距离、多级开关串联而其保护互相之间无法配合的问题。根据我国配网现状,可分为开环模式、闭环模式、全断路器组网模式、混合组网模式、通信异常处理等等多种类型。实施案例表明,基于区域保护的配电自动化终端能够毫秒级将故障切除、隔离,显著加快了故障处理速度,有效避免了越级跳闸,提高了供电可靠性。

A new protection theory, the Regional Protection Principle, is brought forward in this paper.In order to achieve high speed and the selective protection of coordinates, Intelligent controllers, with the aid of the peer-to-peer communication system, collect information of adjacent switch and make a comprehensive judgment. Through this method, the scheme realizes the real distributed, digital and intelligent protection.According to the situation of distribution network in China,the Regional Protection Principle can be classified into Radial network, Loop network., the whole breaker network structure,the breaker and load switch network structure, Fault-tolerant and so on. The implementation and the cases suggest thatthe distribution automation terminal, based on the regional protection,can locate and isolate the fault in milliseconds, significantly speed up the processing speed of the fault, effectively avoid the great trip and improve the power supply reliability.