核电站主变压器设备线夹断裂原因分析  

FRACTURE ANALYSIS OF MAIN TRANSFORMER EQUIPMENT CLAMP IN NUCLEAR POWER PLANT

作　　者：张鸿武 冯楠楠 刘蕊 陈阳 ZHANG HongWu;FENG NanNan;LIU Rui;CHEN Yang(Shandong Electric Power Industry Boiler and Pressure Vessel Inspection Center Co.,Ltd.,Ji′nan 250003,China;Jinan Jingwei Electric Power Engineering Consulting Co.,Ltd.,Ji′nan 250021,China;State Grid Shandong Electric Power Research Institute,Ji′nan 250003,China;State Grid Shandong Electric Power Economic&Technology Research Institute,Ji′nan 250021,China)

机构地区：[1]山东电力工业锅炉压力容器检验中心有限公司,济南250003 [2]济南经纬电力工程咨询有限公司,济南250021 [3]国网山东省电力公司电力科学研究院,济南250003 [4]国网山东省电力公司经济技术研究院,济南250021

出　　处：《机械强度》2022年第5期1101-1106,共6页Journal of Mechanical Strength

基　　金：山东电力工业锅炉压力容器检验中心有限公司技术革新课题项目(GJYF21-03)资助。

摘　　要：某核电站主变压器的多个设备线夹发生了断裂。对断裂的设备线夹以及同批次的备品设备线夹取样,通过宏观检验、渗透检测、金相分析、断口微观形貌分析、压接质量检测、导电率检测和XRD检测,对断裂原因进行了分析。断裂产生的主要原因是设备线夹在强度不足且性能下降的情况下承受了各方面应力,最终在焊缝最薄弱处产生裂纹,形成断裂。为避免同类事故的发生,建议加强金属监督,严把设备质量关。Several equipment clamps of main transformer in a nuclear power company were broken.Taking samples from the broken equipment clamps and the same batch of spare equipment clamps,the fracture causes were analyzed through macroscopic inspection,penetrant testing,metallographic analysis,micro morphology testing,crimping quality testing,conductivity testing and XRD testing.The main reason for the fracture is that the equipment clamp bears all kinds of stress under the condition of insufficient strength and performance degradation,and finally cracks appear at the weakest part of the weld,forming fracture.In order to avoid the occurrence of similar accidents,it is suggested to strengthen the metal supervision and strictly control the quality of the access equipment.

关 键 词：设备线夹 强度不足 性能下降 最薄弱处 断裂 金属监督 

分 类 号：TG111.91[金属学及工艺—物理冶金]