252kV GIS隔离开关温度场仿真及触头温度的预测方法研究

Research on Temperature Field Simulation and Contact Temperature Prediction Method of 252kV GIS Disconnector

为了实现对气体绝缘开关GIS(gas insulator switchgear)触头温升的预测,文中建立了252 kV三相分箱型GIS隔离开关的三维电磁—传热—流场的多场耦合模型并采用有限元方法进行了求解。通过一段电阻率可变导体来模拟隔离开关触头存在接触电阻的情况,首先通过电磁场计算出各部分损耗,再将损耗作为热源带入传热-流场中,最后计算得到GIS的温度分布。对环境温度在-10~30℃、载流量在1000~3150 A、接触电阻在0~100μΩ的条件下,基于该模型计算出了不同情况下GIS的温度场分布,确定了触头最高温升的影响因素,得到了180组触头最高温升与外壳最高温升和载流量的关系。基于所得数据拟合出了一个预测触头最高温度的经验公式,同时基于算得的不同条件下的另外100组触头最高温升与外壳最高温升和载流量的数据以及实测GIS温度初步验证了公式的有效性。文中的工作对GIS内部温度预测的研究有一定的参考价值。

For achieving prediction of the contact temperature rise of gas insulated switchgear(GIS),a three-dimensional electromagnetic-heat transfer-flow multiple field coupling model of a 252 kV three-phase segregated GIS disconnector is set up and solved by the finite element method.A section of resistivity variable conductor is used to simulate the presence of contact resistance in the contact of disconnector.First,the loss of each part is calculated through the electromagnetic field,and then the loss is brought into the heat transfer-flow field as a heat source,and finally the temperature distribution of GIS is obtained by calculation.Under the conditions of ambient temperature at-10~30℃,current at 1000~3150 A and contact resistance at 0~100μΩ,the temperature field distribution of GIS under different situations is calculated based on this model.The influence factors of the maximum temperature rise of the contacts are determined,and the relationship among the maximum temperature rise of the 180 sets of contacts and the maximum temperature rise of the enclosure as well as current carrying capacity is obtained.Based on the obtained data,an empirical formula for predicting the maximum temperature rise of the contact is fitted.At the same time,based on the the maximum temperature rise of another 100 sets of contacts,the maximum temperature rise of enclosure and current carrying capacity which are calculated under different conditions,as well as the actually measure temperature rise of GIS,the validity of the formula is preliminarily verified.The work in this paper has certain reference value for the research of internal temperature prediction of GIS.