针对国电九江发电厂4 号机调节和保安系统改造不完善，而发生静态试验中高、中压调速汽门的油动机开不足和无法正常地进行主汽门活动试验的问题，进行了原因分析，采取了切实可行的处理对策，消除了改造后出现的问题，取得了很好效果。

Due to imperfect renovation of the unit 4’s controlling and security systems of the Guodian Jiujiang Power Plant, some problems occurred such as the servomotor of medium-high and medium pressure governor steam valve was not sufficient in openness during the static test and the movable test of the main steam valve could not be carried out normally. An analysis was carried out on the causes and practical countermeasures were taken to eliminate the renovation-caused problems, which are proved to be effective.