一种快速解环保护及合解环方案

A Kind of Fast Unlink Protection and Loop Closing Scheme

线路合环运行时,当相邻线路发生故障,且保护或开关拒动后,存在主变误跳、扩大失电范围风险。对合环线路对继电保护的影响进行了分析,针对目前方案带来的级差配合困难、设计回路改动量大、降低保护可靠性等问题提出了一种快速解环保护,避免失电范围扩大,并对某些配网的合环转电操作,提出了一种备自投方案,实现合解环程序化操作,在倒闸失败后自动进行反向合解环,确保重要负荷不失电。

When the line operating in loop closing mode and the adjacent lines happened to break down, the protection or switch refused to work, so that there were the main transformer breaking by mistake and the power loss range-enlarged risk. This paper analyzed the loop closing line impacts on the relay protection. Aiming at the difficulty of stage difference coordination caused by the existing scheme, the greatly changed design loop and the reduced protection reliability etc problems. This paper proposed a kind of fast unlink protection to avoid the power loss range-enlarged risk. A kind of spare power automatic switching scheme was proposed for the loop closing turning electricity operation of some distribution networks to realize the operation of loop closing line routinization operation. After the back brake broke down, the reverse loop closing started atomically to ensure the important load without losing power.