Abstract
For an accurate simulation of the voltage stress in secondary circuits caused by very fast transients (VFT) in gas insulated substation (GIS), a sophisticated modelling of the inductive potential and current transformers (PT/CT) is of vital importance. In this paper, we present a high frequency transfer function model of the potential transformer in GIS. The model's set up is based on the frequency response from 1 MHz to 60 MHz which was obtained by testing. We use rational function consisting of real poles as well as complex conjugate poles and zeros to approximate the frequency response. A new fitting method based on vector fitting to fit the frequency response only based on the magnitude frequency characteristics of the PT is proposed.
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