智能变电站兼具旁代功能的线路保护方案

Research and implementation of smart substation line protection device combining with bypass line protection

针对目前旁代操作过程中,线路保护装置操作复杂,误操作风险较高,同时保护性能下降或退出使系统运行风险加大的难题,提出了一种适用于智能化变电站,兼具旁代功能的线路保护新方案。具体介绍了兼具旁代功能的线路保护的整体方案和判据、以及在智能变电站中的数字化实现方案。本方案节省了旁路保护装置,简化了旁代操作时线路保护装置的操作,解决了并列分流对线路保护的影响,避免了旁路时保护性能下降或退出,提高了系统运行的安全性。

This paper aims to solve these difficulties： complexities or maloperations of line protection device, the influence on protection performance during transmission line bypass operation. A new scheme of line protection with bypass line protection is introduced. This scheme is applicable to smart substations. The overall plan and criteria of the new scheme, as well as implementation in smart substation are discussed in detail. In this scheme, a bypass line protection device can be spared, operations of line protection device during transmission line bypass operation can be simplified. Moreover, the influence on protection caused by paralleling branch current can be eliminated, and security of power system can be enhanced.