750 kV GIS中快速暂态过电压的研究

随着超高压气体绝缘变电站(GIS)的广泛使用,由隔离开关(DS)和断路器(CB)操作引起的快速暂态过电压(VFTO)引发的绝缘事故也越来越多。以西北地区750 kV官亭GIS变电站为计算原型,利用电磁暂态程序(EMTP)对不同运行方式下GIS设备上的VFTO进行了数值仿真计算和分析,从而获得不同运行方式和操作方式下各节点的VFTO电压幅值、频率、陡度和波形等数据。根据计算数据对GIS和连接设备的绝缘配合和安全裕度进行了分析,为下一步开展VFTO现场实测提供了理论参考数据。

Calculation of VFTO in 750 kV GIS

With the widespread application of gas insulated substation(GIS),due to its numerous merits,such as large miniaturizing effects,good anti-contamination characteristics,easy maintenance and good environmental adaptability.Harm of the very fast transient voltages(VFTO) caused during disconnector switches(DS) or circuit breaker(CB) operation becomes more obvious with the increasing level of GIS voltages.This paper refers to 750 kV GIS of Guan Ting in northwest China power system.Using the Electro-magnetic Transient Program(EMTP),numerical simulation and analysis of VFTO in different operation modes GIS are carried out,and the data of VFTO under different operation modes,including the frequency,amplitude,steepness and waveform of VFTO are obtained.According to the calculation data,insulation coordination and safety margin of GIS and other devices are analyzed,and theoretical data and the key measuring region for the coming field practical measurement are provided.