| 摘要:针对EDG电液调速器中因密封失效而广泛产生的泄漏故障，利用AMESim软件建立EDG电液调速器系统仿真模型，提出“泄漏-储油量-副齿轮泵吸油不足”链式故障发展机制，定量分析主油道密封泄漏可能引发的中继阀柱塞泄漏和副齿轮泵流量下降两种典型故障模式对调速器性能的影响。研究结果表明：中继阀柱塞和副齿轮泵对泄漏具有一定的耐受能力，导致其功能失效的临界泄漏量分别为1.20~1.74 L/min和0.36 L/min。主油道泄漏会导致调速器内部储油量逐渐减少，当储油量低于副齿轮泵正常工作所需的最低限值时，会造成其吸油不足，进而导致调速器输出轴响应迟缓，最终将引发EDG逆功率保护停机。此外，主油道泄漏对EDG负载突变工况下的调速器性能影响更为显著，不同工况下输出轴阶跃响应时间迟滞30%至50%。揭示了该型号电液调速器主油道密封失效的故障演化机制，为EDG的可靠性提升提供技术参考。 |
| 关键词: 应急柴油发电机组 电液调速器 泄漏演化 副齿轮泵 可靠性提升 |
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| Leakage Failure Mechanism and Reliability Improvement of Electro-Hydraulic Speed Governors in Nuclear Power Plant EDG Systems |
| CHEN Feng,WANG Changqing,SHAO Jiaquan,WANG Deyu,WANG Qifeng,LIN Kangbo |
| Nuclear Power Operation Research Institute， Shanghai 200131， China;National Engineering Research Center of Special Equipment and Power System for Ship and Marine Engineering， Shanghai 201108， China;CNNC Nuclear Power Operation Management Co.， Ltd.， Jiaxing 314300， China;National Key Laboratory of Marine Engine Science and Technology， Shanghai 201108， China;Shanghai Marine Diesel Engine Research Institute， Shanghai 201108， China |
| Abstract:In response to the leakage faults caused by seal failure in a emergency diesel generator （EDG）electro-hydraulic speed governor，a simulation model of the EDG electro-hydraulic speed governor system was established using AMESim software.A chain fault development mechanism of “leakage-oil reservoir depletion-insufficient suction of auxiliary gear pump”was proposed，and the impact of two typical fault modes，relay valve plunger leakage and reduced flow rate of the auxiliary gear pump，which may be caused by main oil passage seal leakage，on the performance of the speed governor was quantitatively analyzed.The research results indicate that：the relay valve plunger and the auxiliary gear pump have a certain tolerance to leakage，and the critical leakage amounts that cause their functional failure are 1.20-1.74 L/min and 0.36 L/min，respectively；main oil passage leakage leads to progressive oil volume reduction within the governor，once the oil level falls below the suction threshold of the auxiliary gear pump，oil starvation occurs，slowing the response of the governor output shaft and potentially triggering reverse power protection shutdown of the EDG；the leakage of the main oil passage has a more significant impact on the performance of the governor under sudden load changes in EDG，increasing output shaft response delay by 30% to 50% under different operating conditions.It is revealed that the fault evolution mechanism of the main oil passage seal failure of this model of electro-hydraulic governor，providing technical reference for the reliability improvement of EDG. |
| Key words: emergency diesel generator set electro hydraulic speed governor leakage evolution secondary gear pump reliability improvement |
