某600 MW超临界机组运行中高压调节阀及油管路振动大，伴随着EH油泵电流突升及油压降低，分步排查发现是由于油站蓄能器以及高压供油管路蓄能器破裂，导致高压气体夹杂其他杂质进入油系统引起高压调节阀伺服阀卡涩。经逐个检测，根据油动机状态确定相应的处理方法，详细介绍了在线隔离油动机更换伺服阀过程，油系统已恢复正常运行。%Fierce high-pressure regulating valve and oil pipe vibration occur in operation of 600 MW super-critical units with current surge of EH oil pump and the oil pressure decrease. It is detected step by step that the causes are rupture of oil station accumulator and high-pressure oil supply pipeline accumulator, due to which high-pressure gas and other impurities enter into the oil system and cause jam in servo valve of high-pressure regulation valve. Through one-by-one test, the corresponding treatment methods are determined by state of oil servomotors. The paper expounds online servo valve replacement by isolating oil servomotor, after which oil system goes back into normal operation.
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