基于故障树理论的电容型套管故障模拟与辨识  

Fault Simulation and Identification of the Capacitive Bushing Based on Fault Tree Theory

作　　者：董明[1] 刘阳 杨凯歌 席英杰 胡一卓 任明[1] DONG Ming;LIU Yang;YANG Kaige;XI Yingjie;HU Yizhuo;REN Ming(State Key Laboratory of Electrical Insulation and Power Equipment(Xi’an Jiaotong University),Xi’an 710049,Shaanxi,China)

机构地区：[1]电力设备电气绝缘国家重点实验室(西安交通大学),陕西西安710049

出　　处：《电网与清洁能源》2022年第6期1-9,共9页Power System and Clean Energy

基　　金：国家电网有限公司科技项目资助(5500-201999543A-0-0-00)。

摘　　要：电容式套管是大型电力变压器的主要部件,对其进行可靠监测对维护电力系统安全具有重要意义。通过设计套管缩比模型,并人工制作尾部受潮和金属微粒放电故障,在实验室中筛选出电容变化率、介质损耗角正切、最大放电幅值、平均放电幅值和最大脉冲数5种特征值,研究发现套管尾部受潮故障时介质损耗类特征参量变化明显,且无明显放电现象,放电类故障时介质损耗参量变化不明显。利用层次分析法搭建故障树模型对2类故障进行分类和诊断,结果表明,该模型具有较高的故障判断准确性。Capacitive bushings are the main components of large power transformers,and their reliable monitoring is of great significance for maintaining the safety of power systems.By designing the scaling model and artificially creating tail moisture and metal particle discharge faults,five characteristic parameters of capacitance variation,dielectric loss tangent,maximum discharge amplitude,average discharge amplitude and maximum pulse number are extracted,and it is found that the change of dielectric loss class characteristic parameter is obvious when the bushing tail moisture fault occurs with no obvious discharge phenomenon,and the change of dielectric loss class parameter is not obvious in the case of discharge fault.Finally,a fault tree model is built using hierarchical analysis to classify and diagnose the two types of faults,and a high accuracy is achieved.

关 键 词：高压套管 尾部受潮 金属微粒放电 故障树 

分 类 号：TM855[电气工程—高电压与绝缘技术] TM621.7