广东罗定电厂1号机组DEH调速系统在冲转过程中多次出现因为EH油压低导致汽轮机跳闸。根据故障现象排查出发生故障的几个可能原因,如:系统存在泄漏、泵故障、运行方式不当等。通过核实,寻找出发生故障的真实原因是:调门动作频繁造成机体很大的振动,导致卸荷阀针阀的旋转手柄弹开,使高压调门卸荷阀卸荷,造成油压下降。 Guangdong Luoding Power Plant Unit 1 DEH governor system in the red several times because of the EH low oil pressure led to the turbine trip. According to the fault phenomenon to troubleshoot several possible reasons for failure, such as: system leakage, pump failure, improper operation and so on. Through verification, find out the real reason for the failure is: frequent door movements caused by the body a lot of vibration, leading to the unloading valve needle valve handle rotation bounce, so that high-pressure control valve unloading valve unloading, resulting in hydraulic pressure drop.