抽水蓄能电站螺栓应力监测方法  

Methods of Bolt Stress Monitoring for Pumped Storage Power Station

作　　者：赵强 徐亚鹏 郭鹏 曹佳丽 王佳彬 崔泰然 ZHAO Qiang;XU Yapeng;GUO Peng;CAO Jiali;WANG Jiabin;CUI Tairan(Pumped-Storage Technological&Economic Research Institute State Grid Xinyuan Co.Ltd.,Beijing 100053,China)

机构地区：[1]国网新源控股有限抽水蓄能技术经济研究院,北京市100053

出　　处：《水电与抽水蓄能》2024年第3期85-91,共7页Hydropower and Pumped Storage

基　　金：国网新源集团有限公司科技项目“基于抽水蓄能电站顶盖连接安全的螺栓强度及预紧研究”(SGXYKJ-2022-045)。

摘　　要：螺栓承受轴向载荷时,伸长量和应力变化规律遵循广义胡克定律。现有的监测方法都是通过伸长量的变化监测螺栓的应力水平,进而评价螺栓的安全状况。随着微变形测试方法的发展,利用声学、光学、电学等监测手段均广泛应用于抽水蓄能电站螺栓的应力水平监测。本文简述了目前应用最为广泛的几种监测应力方法的原理和应用特点。Turbine head cover bolts are important parts of the turbine,and their reliability is critical to the operational safety of the hydropower plant.Ultrasonic testing is widely used in the inspection of bolt fatigue cracks.However,the conventional scheduled maintenance can not eliminate the fatigue failure of bolts.In order to effectively monitor the crack and damage of the head cover bolts under the operation state,this paper proposes a bolt state maintenance scheme.Through the development of bolt ultrasonic monitoring sensor and digital processing of reflected signals,the in-situ monitoring of the fatigue crack of the head cover bolts of the turbine is realized,which provides a safety guarantee for the long-term operation of the hydropower station.

关 键 词：抽水蓄能电站 螺栓 应力监测 声弹法 光纤光栅法 电阻应变法 电容法 

分 类 号：TG47[金属学及工艺—焊接]