摘要
操作GIS中的隔离开关时,产生的极快速暂态过电压(VFTO)给 GIS 和隔离开关本身带来严重威胁.综述了VFTO的相关研究现状,包括VFTO的产生机理及危害、基本参数、相关间隙的击穿特性、隔离开关机构速度的影响、隔离开关耐受VFTO的试验,以及VFTO的抑制方法、建模与计算等.同时,提出利用实测残余电压估算隔离开关触头间隙击穿特性的方法,并应用于某 750 kV GIS,为绝缘配合设计提供依据.
Abstract
The operation of disconnectors in gas insulated switchgear(GIS)generates very fast transient overvoltages(VFTO),which pose significant threats to both the GIS and the disconnectors themselves.This paper reviews the current research on VFTO,including its generation mechanisms and associated hazards,basic parameters,and the breakdown characteristics of related gaps.It also discusses the influence of operating speed on VFTO,VFTO withstanding testing of disconnectors,and methods for VFTO suppression,modeling,and calculation.Additionally,a method is proposed for estimating the breakdown characteristics of disconnector contact gaps using residual voltage measured on-site at a substation.This method is applied to a 750 kV GIS,with the aim of providing a basis for insulation coordination design.
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