GIS隔离开关不同接触状态下的温升特性研究

Study on Temperature Rise Characteristics of GIS Disconnector Under Different Contact Conditions

GIS因具有通流能力强、输送容量大、结构紧凑和使用寿命长等优点被广泛地应用于高压输电领域,而GIS隔离开关由于其封闭性和结构的紧凑性导致内部热故障不易被发现。因此,文中利用有限元多物理场分析方法建立仿真模型,分析了GIS隔离开关导体和外壳在同一负荷电流、不同接触状态下以及同一接触状态、不同负荷电流下的温升,得到GIS内部的温度场及流场分布情况,并搭建了GIS隔离开关温升实验平台进行实验验证。结果表明:通过对比多物理场耦合计算结果与实验结果证明了该模型的正确性以及有效性;触指是温升最高的地方,触头上方的位置为外壳上的最佳温度监测点;触头接触不良时的温升值和温升速率明显增大。文中的研究可以为GIS隔离开关的状态监测提供参考。

GIS has been widely used in the field of high voltage transmission due to its advantages of strong flow ca⁃pacity,large transmission capacity,compact structure and long service life.However,the GIS disconnector is not easy to detect internal thermal malfunction due to its closure and compact structure.Hence,this paper build a multi⁃ple physical field coupling simulation model of GIS disconnector.This paper analyzed temperature rise law under dif⁃ferent contact states of the same current level and different current level of same contact states.The temperature field distribution and the flow field distribution in GIS is obtained,and the GIS disconnector temperature rise experiment platform is built for experimental verification.The results show that the correctness and validity of the model are proved by comparing the results of multi⁃physical coupling calculation with the experimental results.In addition,the highest temperature rise is at the contact finger,and the top side of the contact is optimum temperature monitoring point of the shell.Finally,the temperature rise and the temperature rise rate increase obviously when the contact is bad.The research work in this paper can provide reference for the condition monitoring of GIS disconnector.