For fast calculation of electromagnetic field leaking from the basin-type insulator of gas insulated substation（GIS） during very fast transient process

the calculation process is divided into circuit model calculation and electromagnetic field model calculation. In the circuit model calculation

a non-linear circuits model of GIS is established based on transmission line theory and non-linear arc characteristics

which can be used to calculate very fast transient currents（VFTC

namely

source of radiation）. In the electromagnetic field model calculation

a finite element model is established for the radiation from the basin-type insulator and used to calculate the impulse responses. After the vector recursive convolution being applied

VFTC and impulse responses can be used to simultaneously calculate the radiation field in many points under the switcher operation. When there are more than one VFTC resource

compared to multiple calculation by the finite element method

the approach in this paper can be adopted to simultaneously get electromagnetic fields at many points only through a finite element calculation

and thus can remarkably quicken the calculated speed.The results comparison with different methods in the references and calculation results of the radiation field in 1 000 kV GIS show that electromagnetic field of multiple filed points leaking from the basin-type insulator of GIS under certain VFTC can be acquired fast and accurately through using the approach in this paper.