摘要
某火电厂1000 MW汽轮机组EH油泵电机运行电流逐渐增大,10天内增大了3 A,比正常运行电流大了13%左右且还有继续增大的趋势。通过就地观察各主汽门、主汽调门阀杆活动情况,以及测量各油动机EH油进回油管温差,分析出2台小机主汽调门油动机电液伺服阀存在内漏现象。通过关闭小机调门进行试验,进一步确认伺服阀内漏故障。分析EH油系统布置,确定在线更换伺服阀的可行性,并在机组低负荷阶段及时进行实施,更换2台小机电液伺服阀后EH油泵电机运行电流恢复至正常值。
The running current of EH oil pump motor operation for a 1000 MW steam turbine unit in some thermal power plant gradually increased.It increased by 3 A in 10 days,about 13%higher than the normal running current,and there was a trend to continue to increase.The internal leakage of the hydraulic electro-hydraulic servo valves of the main steam control valves of the two small turbines was analyzed by observing the movement of the valve stems of the main steam valves and the main steam control valves and measuring the temperature difference of the EH oil inlet and return pipes of the hydraulic servo motors.The internal leakage fault of the servo valve was further confirmed by closing the small turbine control valve.It analyzed the layout of EH oil system,determined the feasibility of online replacement of servo valve,and timely implemented it in the low load stage of the unit.After replacing the two small electromechanical servo valves,the running current of the EH oil pump motor returned to the normal value.
作者
贺栋红
He Donghong(Shenneng Hehe Electric Power(Heyuan)Co.,Ltd.,Heyuan,Guangdong 517025,China)
出处
《东北电力技术》
2023年第6期58-62,共5页
Northeast Electric Power Technology
关键词
EH油泵
电流异常
在线更换
内漏
电液伺服阀
EH oil pump
running current abnormal
changed online
internal leakage
electro hydraulic servo valve
