A high frequency transfer function model of potential transformer in GIS

Author

Zhongyuan, Zhang ; Guishu, Liang ; Xiang, Cw ; Maolin, Wu

Author_Institution

Dept. of EE, North China Electr. Power Univ., Baoding, China

fYear

2002

fDate

21-24 May 2002

Firstpage

186

Lastpage

189

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.

Keywords

frequency response; gas insulated substations; poles and zeros; potential transformers; transfer functions; transients; 1 to 60 MHz; GIS; complex conjugate poles and zeros; current transformers; fitting method; frequency response estimation; gas insulated substation; high frequency transfer function model; inductive potential; magnitude frequency characteristics; potential transformer; rational function; vector fitting; very fast transients; Circuit simulation; Current transformers; Frequency response; Gas insulation; Geographic Information Systems; Power transformer insulation; Stress; Substations; Transfer functions; Voltage transformers;

fLanguage

English

Publisher

ieee

Conference_Titel

Electromagnetic Compatibility, 2002 3rd International Symposium on

Print_ISBN

0-7803-7277-8

Type

conf

DOI

10.1109/ELMAGC.2002.1177398

Filename

1177398