| GIS overheating breakdown is one of the most serious and most concerned transformer equipment failures in the national power grid.Simulating the temperature rise of GIS equipment and studying its temperature rise characteristics under different environmental conditions and implement monitoring on this basis,which can effectivcly reduce the occurrence of fault accidents,improve the maintenance efficiency of power grid equipment,and ensure the safe and stable operation of the grid power system.In order to solve the problem of temperature rise in GIS,a 220kv single-phase GIS electro-magnetic-thermal-current coupling simulation model was established,and the model was optimized to meet the simulation needs On the Ansys Workbench platform,an clectro-magnetic-thermal-current coupling multiphysics field coupling study was conducted,and a steady-state temperature field and airflow field analysis model was established.The eddy current field,steady-state temperature field and airflow field related to temperature rise were established.The problem was studied in-depth simulation.Secondly,the influence of different environmental factors on the temperature rise characteristic distribution of 220kV single-phase GIS was studied First,the electromagnetic field and temperature field under 2500A rated GIS considering contact resistance,proximity and skin effect and eddy current effect are studied,and the ohmic loss and temperature rise characteristics of each component of GIS are analyzed;then the different working operating current,ambient temperature,and altitude were studied The electromgnetic field and temperature field of GIS under the conditions of altitude and wind speed are analyzed to change the temperature rise characteristics of each component of GIS under a single environmental variable,and the corresponding law of temperature rise is obtained through research.At the same time,the influence of different electrical contact states on GIS temperature distribution was studied.Introduces the comparison and simulation of the temperature rise of the internal temperature field and the temperature rise of the housing when considering the proximity effect and skin effect,and analyzes the temperature rise changes of various components of the GIS equipment under different electrical contact states(including fault states)to obtain a more accurate temperature field And the distribution characteristics of the airflow field,at the same time,the temperature rise characteristics of the GIS effected by external environmental factors under the condition of electrical contact failure are analyzed,and the distribution characteristics of the convective heat flux and radiant heat flux inside the GIS are compared and compared to obtain different electrical contact states Distribution characteristics of GIS temperature rise.Based on the established electromagnetic-heat-flow coupling simulation model,this paper further studies the distribution law of the internal temperaturc field and temperature rise of the three-phase GIS.Analyze the internal heat transfer process of three-phase GIS and the influence mechanism of different heat transfer methods.The temperature rise of different parts of GIS,the internal gas velocity and the distribution of temperature field were studied.The research results show that the coupling simulation method established in this paper can accurately and efectively calculate the temperature rise of GIS equipment.The distribution law of GIS temperature rise characteristics under the complex environment studied has important guiding significance for the operation and maintenance of GIS. |
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