Transient electric field analysis of disk insulator for Gas insulated switchgear

Fourier transform are used on the very fast transient overvoltage (VFTO) discretion, different spectral components of transient voltage waveform are achieved. The mathematical model of the transient electric field is deduced considering dielectric polarization loss and displacement current. FEM is adopted to calculate the transient electric field of gas insulated switchgear disk insulator under the condition of VFTO, potential distribution curves at key point time are shown, which are compared with the one in the quiescent state. The tangential electric field strength and normal electric field strength along with radial direction on the insulator surface are illustrated. Some effects of typical positions electric field strength along with time are shown in this paper. The references for GIS insulation design are provided.