GIS隔离开关触头温升多场耦合数值计算与分析

摘要

The overheat fault of gas insulated switch-gear (GIS) disconnector contacts severely damages the reliable operation of equipment.In order to monitor the temperature rise and the overheat fault of GIS disconnector contacts,this paper establishes a 3D numerical coupled multi-physics model of eddy current-fluid-temperature of GIS with contacts.The resistance of contactor is replaced by a conductor with variable resistivity,and the current density and power loss of GIS disconnector are calculated through analyzing the electromagnetic field.The temperature of conductor and tank are calculated by using the finite element model whose heat source is power loss.The inversion law and influence factors of the temperature rise of GIS disconnector contacts are studied based on the coupled multi-physics model.The results show that the relationship between the contact of phase A,B and the temperature rise of tank is 1 ∶ 0.215,and the relationship between the contact C and the temperature rise of tank is 1 ∶ 0.165.The research results can provide theoretical basis and technical support for monitoring the temperature rise of GIS.%GIS隔离开关触头过热性故障严重危害设备的可靠运行,为实现对GIS隔离开关触头温升和过热性故障的监测,建立了包含触头的GIS隔离开关的三维涡流-流体-温度多场耦合数值计算模型,用一段电阻率可变的导体来模拟触头部位的接触电阻,通过电磁场分析计算GIS隔离开关各个部位的电流密度和功率损耗,将功率损耗作为热源载荷代人流体-温度场耦合计算模型计算导体和外壳的温度场分布.基于该模型研究了GIS隔离开关触头温升反演规律及影响因素,结果表明A、B相触头与外壳温升存在1∶0.215的对应关系,C相触头与外壳温升存在1∶0.165的对应关系,研究成果可为开展GIS隔离开关的温升监测提供理论依据与技术支持.