变压器螺柱弹簧压紧结构套管末屏故障原因分析及处理  

Cause Analysis and Treatment of an End Shield Foult of Transformer Stud Spring Compression Structure Bushing

作　　者：聂喜玲 刘泉 李锐 NIE Xiling;LIU Quan;LI Rui(Liuzhou Power Supply Bureau of Guangxi Power Grid Co.,Ltd.,Guangxi Liuzhou 545005,China;Guangxi Key Laboratory of Intelligent Control and operation and Maintenance of Power Equipment,Electric Power Research Institute of Guangxi Power Grid Co.,Ltd.,Guangxi Nanning 530023,China;Guangxi Power Grid Equipment Monitoring and Diagnosis Engineering Technology Research Center,Electric Power Research Institute of Guangxi Power Grid Co.,Ltd.,Guangxi Nanning 530023,China)

机构地区：[1]广西电网有限责任公司柳州供电局,广西柳州545005 [2]广西电网有限责任公司电力科学研究院广西电力装备智能控制与运维重点实验室,广西南宁530023 [3]广西电网有限责任公司电力科学研究院广西电网设备监测及诊断工程技术研究中心,广西南宁530023

出　　处：《广西电力》2023年第5期75-79,共5页Guangxi Electric Power

摘　　要：某220 kV变电站预试定检过程中发现主变高压C相套管末屏防雨盖打开时有绝缘油渗漏,伴随微量气体喷出,渗漏油中存在疑似游离碳的黑色物体,末屏头部有发黑现象。为进一步对该主变套管末屏缺陷进行分析,通过电气试验、油气试验进行对比,并结合红外测温情况以及末屏接地检查情况,认为该套管末屏接地弹簧长期运行后弹力不足导致末屏接地不良,进而引起末屏放电。为防止类似缺陷发生,提出了相应的处理措施,为后续该类型主变套管缺陷判断提供案例支撑及原因分析。During the pre-test and inspection process of a 220 kV substation,it was found that there was insulation oil leakage when the rainproof cover of the C-phase bushing end shield of the main transformer was opened,accompanied by a trace of gas spraying.There was a black object suspected of free carbon in the leaked oil,and the head of the end shield turned black.To further analyze the defects of the end shield of the main transformer bushing,a comparison was made through electrical tests and oil&gas tests,combined with the infrared temperature measurement and the grounding inspection of the end shield.It is believed that the insufficient elasticity of the grounding spring at the end shield of the bushing after long-term operation leads to the poor grounding of the shield screen,which in turn causes discharge at the end shield.To prevent similar defects from occurring,corresponding treatment measures are proposed,which provides case support and cause analysis for the subsequent judgment of defects in this type of main transformer bushing.

关 键 词：套管 变压器 末屏 接地不良 故障分析 

分 类 号：TM41[电气工程—电器]