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随着电力系统的不断发展,越来越多的电子设备引入到变电站中,而气体绝缘开关设备(gas insulated switchgear,GIS)中的隔离开关操作往往作会造成空间暂态电磁辐射,分析隔离开关操作过程中GIS管壳周围空间电磁场分布对安装在管壳周围的电子设备的电磁兼容设计有着非常重要的参考意义。建立了GIS管壳的电路和电磁辐射模型,计算得到了GIS隔离开关操作过程中管壳接地电流引起的空间暂态电磁场。结果表明:管壳周围电磁场时域波形跟随管壳电流变化;管壳附近的空间电磁场随着与管壳之间距离增加而剧烈衰减,在离管壳较远的位置,电场呈线性衰减,磁场呈指数衰减;随着接地点个数增加,暂态对地过电压的幅值显著降低,且离套管位置较远处电磁场幅值有所减小。对GIS管壳附近的空间电磁场进行了测量,计算结果与现场实测数据基本相符。
With the continuous development of power system, more and more electronic devices are introduced into the substations, and the operation of the isolating switch in the gas insulated switchgear (GIS) often results in the generation of space transient electromagnetic radiation. The analysis isolating switch During operation, the distribution of electromagnetic field in the space surrounding the GIS enclosure has a very important reference meaning for the EMC design of the electronic equipment installed around the enclosure. The circuit and electromagnetic radiation model of GIS tube shell were established. The space transient electromagnetic field caused by the tube shell grounding current during the operation of GIS isolating switch was calculated. The results show that the time-domain waveform of the electromagnetic field around the envelope changes with the current of the envelope; the space electromagnetic field near the envelope declines drastically with increasing distance from the envelope; the electric field attenuates linearly at a distance from the envelope, Exponential decay; With the increase of the number of grounding points, the amplitude of transient over-ground voltage significantly decreases, and the amplitude of the electromagnetic field farther away from the casing position decreases. The electromagnetic field in the space near the GIS shell was measured. The calculated results are in good agreement with the measured data in the field.