乐滩水电站调速器机械液压系统改造

Upgrade of governor mechanical hydraulic system for Letan Hydropower Station

介绍了乐滩水电站单比例阀控制的调速器机械液压系统改造措施,改造后的调速器解决了原调速器卡阻和窜油现象。带自复中功能的比例阀控制系统可保证在调速器比例阀失去外部控制信号和电源时无扰动地切换至自复中控制回路,从而保持失电或者切换前的接力器开度值。改造后的调速系统静特性、动特性、稳定性等参数均满足或优于规范要求。

An introduction was made on the upgrade of governor mechanical hydraulic system of Letan Hydropower Station with simple proportional valve, settling the problem of oil jamming and leaking. Disturb-free automatic-switch to the spring center control circuit is secured in case of failure of external control signal or power supply to the proportional valve, so as to keep the servomotor opening before power failure or switching over. The performance of governor, such as static and dynamic characteristics as well as stability etc. , all satisfy or exceed the requirements of specification after the upgrade.