进线备自投工作模式的改进方案

The improvement scheme of the working mode of the incoming line automatic operation

对于主接线方式为内桥接线的变电站,采用进线备自投时,主变压器差动保护动作或主变重瓦斯动作后会闭锁备自投。经分析发现主变差动保护动作或主变重瓦斯动作后闭锁备自投存在缺陷。针对缺陷提出了进线备自投工作模式的改进方案,并给出了改进方案的逻辑框图。进线备自投工作模式的改进方案缩短了故障后恢复送电的时间,提高了电网的供电可靠性。

For substations main wiring mode is internal bridge connection, when it is incoming line automatic operation, it will be locked up when the main transformer differential protection action or the main transformer heavy gas action. After analysis, we found the defect of self locking automatic operation when the main transformer differential protection action or the main change of heavy gas after the action. This paper put forward the improved scheme of the working mode of the line in-line auto-cast, and gave the logic diagram of the improved scheme. The improved scheme of the line in-line auto-switching mode shortens the time of power supply after fault and improves the reliability of power supply.