SF_(6)/N_(2)混合气体GIS三相共箱母线接头发热时温度分布及诊断方法的仿真研究  

Simulation Study on Temperature Distribution and Diagnostic Method of Three-phase Enclosed Bus Joint Heating of GIS with SF_(6)/N_(2) Gas Mixture

作　　者：张丕沛 赵晓楠 丛龙琦 郭晨瑞 ZHANG Pipei;ZHAO Xiaonan;CONG Longqi;GUO Chenrui(State Grid Shandong Electric Power Research Institute,Jinan 250003,Shandong,China;State Grid Weihai Electric Power Supply Company,Weihai 264200,Shandong,China)

机构地区：[1]国网山东省电力公司电力科学研究院,山东济南250003 [2]国网山东省电力公司威海供电公司,山东威海264200

出　　处：《四川电力技术》2024年第5期27-33,共7页Sichuan Electric Power Technology

基　　金：国家电网有限公司总部科技项目“基于光纤传像的GIS内部多谱段光学成像关键技术研究”(520626220048)。

摘　　要：以SF_(6)/N_(2)混合气体作为绝缘介质的气体绝缘金属封闭开关设备(GIS)可有效降低环境污染,目前已逐渐在220 kV及以下GIS母线中推广应用。由于母线接头接触不良引起发热是GIS较为常见的缺陷,因此针对SF_(6)/N_(2)混合气体GIS母线接头接触不良时的温度分布开展研究。首先,建立了220 kV SF_(6)/N_(2)混合气体三相共箱母线多物理场耦合的三维等比例仿真模型,通过在母线接头处设置电阻膜实现接触不良状态的模拟,从而对不同相别的母线接头接触不良时的温度分布规律开展计算分析;然后,研究了利用壳体表面温差诊断内部严重发热缺陷的方法。研究结果显示:任意一相母线接头接触不良时,壳体表面对应位置都会出现温度最高点;当顶部两相母线接头发热且壳体表面温差达到2.5 K,或底部母线接头发热且壳体表面温差达到2.0 K时,可诊断为严重缺陷。Gas insulated switchgear(GIS)taking SF_(6)/N_(2) gas mixture as insulating medium can effectively reduce environmental pollution,and it has gradually been applied in GIS at 220 kV and below.Considering that poor contact of bus joint is a common defect,it is necessary to study the temperature distribution of bus joint of GIS with SF_(6)/N_(2) gas mixture during poor contact.Firstly,a 3D simulation model of multi-physics coupling for 220 kV three-phase enclosed bus with SF_(6)/N_(2) gas mixture is established.By setting a resistance film at the bus joint to simulate the poor contact state,the temperature distribution law of bus joint of different phases with poor contact is calculated and analyzed.And then,the method for diagnosing severe internal heating defects using the surface temperature differences of shell is studied.The results show that when the contact of any phase bus joint is poor,the highest temperature point will appear on the corresponding position of shell surface,and when the top two bus joints are heating and the temperature differences on shell surface reach 2.5 K,or when the bottom bus joints are heating and the temperature differences on shell surface reach 2.0 K,it could be diagnosed as a serious defect.

关 键 词：混合气体 接触不良 温度分布 多物理场耦合 缺陷诊断 

分 类 号：TM216[一般工业技术—材料科学与工程]