青溪水电厂轴流式机组顶盖排水控制回路经常出现故障 ,是电厂安全运行的难题之一 ,也是国内轴流转浆机组运行亟待解决的问题 ,因此 ,青溪水电厂对顶盖排水控制回路进行了改造。通过故障统计和分析 ,找出故障主要原因 ,最后决定以可编程控制器替换常规控制回路。改造后水泵控制回路的故障降为零 Qingxi Hydropower Plant axial flow unit roof drainage control circuit often fails, is the power plant safe operation of the problem, but also the domestic axial turbine unit operation problems to be solved, therefore, Qingxi hydropower plant roof drain control loop Transformation. Through the fault statistics and analysis, find the main reason for the failure, the final decision to replace the conventional control loop programmable logic controller. After the transformation of the pump control loop down to zero fault