Common Faults and Solutions in the Process of Electric Valve Commissioning of EPR Nuclear Power Unit
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摘要: 国内某核电厂的一台欧洲先进压水堆（EPR）核电机组有926台电动阀门，在电动阀门调试过程中，发现阀门电动装置存在6类共性故障，即电动装置的力矩值与设计值存在偏差、开力矩微动开关频繁触发、反转、控制回路缺少跳线、内部减速齿轮选型设置不合理、电机齿轮箱润滑脂泄漏。本文针对这6类共性故障，通过详细的故障现象描述和故障原因分析，制定了相应的故障解决方法，主要包括电动装置力矩校验、增加开力矩旁路、电缆相序调整、增加跳线、更换合适齿数的减速齿轮和更换密封圈的措施。6类共性故障的解决不仅提高了电动阀门运行的可靠性，而且为后续核电机组电动阀设计和调试提供了经验。Abstract: There are 926 electric valves in an evolutionary power reactor (EPR) nuclear power plant in China. During the commissioning of electric valves, six common faults were found in the electric actuators, namely, deviation between the torque value and the designed value, frequent triggering of the open torque microswitch, reversal, lack of jumper in the control loop, unreasonable selection of gear ratio in the reduction gear, and leakage of lubricating grease in the motor gearbox. This paper addresses these six common faults by providing detailed descriptions of the fault phenomena and analyses of the fault causes, and then proposes corresponding fault-solving methods, including torque calibration of the electric actuator, adding a bypass for the open torque microswitch, adjusting the phase sequence of the cables, adding a jumper, replacing the gear with the appropriate number of teeth in the reduction gear, and replacing the seal ring. The solution to these six common faults not only improves the reliability of the electric valve operation, but also provides experience for the subsequent design and commissioning of nuclear power unit electric valves.
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Key words:
- EPR /
- Electric valve /
- Electric actuator /
- Commissioning process /
- Torque of valve /
- Common faults /
- Reduction gear
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图 3 电动装置的开力矩旁路原理图
Figure 3. Schematic Diagram of Torque Open Bypass of Electric Actuator
图 5 电动装置内部减速齿轮示意图
Figure 5. Schematic Diagram of Internal Reduction Gear of Electric Actuator
表 1 电动装置故障分类及数量
Table 1. Electric Actuator Fault Classification and Quantity
序号 单堆改造范围 单堆改造的电动装置数量/台 故障1 全厂电动阀门 926 故障2 按照采购包梳理 276 故障3 全厂电动阀门 926 故障4 按照电缆接线文件 63 故障5 按照采购包梳理 42 故障6 反应堆厂房内的电动阀门 281 
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[1] 陆培文. 实用阀门设计手册[M]. 北京: 机械工业出版社,2002: 1362. [2] 张汉林,张清双,胡远银. 阀门手册——使用与维修[M]. 北京: 化学工业出版社,2013: 9. -
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