基于温度检测的气体绝缘开关接触状态场路结合分析法  

Field-circuit combination analysis method of contact state of GIS based on temperature measurement

作　　者：李征宇 高晋文 高宝明 原帅 李琦 牌永锋 LI Zhengyu;GAO Jinwen;GAO Baoming;YUAN Shuai;LI Qi;PAI Yongfeng(Maintenance Branch of State Grid Shanxi Electric Power Corporation,Taiyuan 030000,China;Transmission Maintenance Branch of State Grid Shanxi Electric Power Corporation,Taiyuan 030000,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]国网山西省电力公司检修分公司,山西太原030000 [2]国网山西省电力公司输电检修分公司,山西太原030000 [3]西安交通大学电力设备电气绝缘国家重点实验室,陕西西安710049

出　　处：《热力发电》2022年第2期142-149,共8页Thermal Power Generation

基　　金：国网山西省电力公司科技项目(520510200003)。

摘　　要：以气体绝缘开关(GIS)为研究对象,通过分析动静触头的接触电阻及温度、风速和辐射等环境因素对GIS温度分布的影响规律,提出基于温度检测的GIS接触电阻的场路结合计算方法,用于定量预测GIS触头的接触状态。首先建立GIS的电磁-热-流多物理场耦合模型,并提出考虑热传导、热对流和热辐射3种散热方式的等效热路模型,进而利用多物理场数值仿真结果作为训练样本,给出导杆与壳体之间的SF6气体对流散热等效热阻、壳体内外表面之间的等效热阻以及壳体外表面与空气之间的等效热阻的计算方法。利用该场路结合预测模型,通过检测并输入壳体上下代表测点的温差值可计算得到GIS的接触电阻,从而评估GIS接触状态。最后通过GIS接触电阻计算结果与试验结果对比,验证了提出的场路结合分析法评估GIS接触状态的可行性和优越性。Takinggas insulation switch(GIS)as the research object,through analyzingthe influencesofcontact resistanceandenvironmental factors such as temperature,wind speed and radiation on the temperature distribution of GIS,a field-circuit combination calculation method of GIS contact resistance based on temperature detection is proposed.It is used to quantitatively predict the contact state of GIS.In this paper,the electromagnetic-heat-flow multiphysics coupling model of GIS is established,and an equivalent heat circuit model that considers heat conduction,heat convection and heat radiation is proposed.Then,the multiphysics numerical simulation results are used as training samples,the equivalent thermal resistance of SF6gas convective heat transfer,the equivalent thermal resistance between the inner and outer surfaces of the shell and the equivalent thermal resistance between the outer surface of the shell and the aircan be obtained.Using this field-circuit combined prediction model,the contact resistance can be calculated by detecting the temperature difference between the upper and lower representative measuring points of the shell,which can be used to evaluate the contact state.At last,by comparing with the test results,the feasibility and superiority of the evaluation method are verified.

关 键 词：GIS 接触状态 等效热阻 温度检测 场路结合 状态评估 

分 类 号：TM507[电气工程—电器]