T接线光纤差动保护的实用通信方案

The practicable communication scheme for fiber differential protection of T-connected transmission lines

介绍了T接线路下差动保护采用的三端传输系统的应用方案,主要包含系统构成、冗余同步计算和通道异常时自适应处理逻辑。其中冗余同步计算方案通过两个从端的互校计算能够有效地识别通道收发延时不一致情况,确保了差动保护不会因为数据不同步而误动。该方案在许继电气股份有限公司研制的WXH-813A/T装置上得到了实现。通过华北电力科学院与北京电力公司共同组织的动模实验,证明该方案具有很好的实用价值。

This paper presents a kind of practicable scheme used in differential protection on three-terminal transmission system.It mainly contains the construction of three terminal data transmission system,redundancy synchronization computation and adaptive processing logic under abnormal channel.By mutual check and computation of the two slave terminals,redundancy synchronization computation scheme can effectively distinguish the inconsistent situation of transfer-receive delay time,which then prevents differential protection from false operation due to unsynchronized data.The scheme is used on WXH-813A/T protection device developed by XJ Electric Corporation.By means of dynamic simulation system organized by North China Electric Power Research Institute and Beijing Electric Power Company,the results show that this scheme has a meaningful practical value.