GIS电站内传导干扰计算模型的建立

A CONDUCTIVE COUPLING MODEL IN GAS INSULATED SUBSTATION

为了仿真计算GIS电站内由开关操作在二次回路产生的传导干扰,提出了GIS传导干扰整体计算模型的概念,并建立了模型。在这个整体模型中,用有理函数建立了用于计算容性传导耦合的PT/CT的高频模型和用于计算阻性传导耦合的多端口地网模型。这些模型是基于实测数据采用矢量匹配法建立的。把这些有理函数模型植入EMTP后,不仅可以计算一次系统的特快速暂态过电压和暂态地电位升高,还可计算二次系统的干扰信号。

A simulation model is set up in order to calcu-late the conductive disturbing voltage in secondary circuit caused by disconnector or circuit breaker operations in GIS.In this model,the high frequency capacitive PT/CT model and the multi-terminal network model for grounding system are included using rational functions by means of vector fit-ting based on test data.By incorporation them into EMTP,one can use this conductive coupling model of GIS to cal-culate not only the very fast transient Overvoltages(VFTO)and Transient Ground Potential Rise(TGPR)in the primary circuit but also the disturbing voltage in the secondary cir-cuits in GIS.