CAJ | 학술논문

气体绝缘开关设备（gas insulated switchgear,GIS）内的隔离开关在操作空载短母线时会发生多次击穿,并产生特快速瞬态过电压（very fast transient overvoltage,VFTO）,严重时可能造成变压器和其他电气设备的损坏。隔离开关的操作速度是影响VFTO的重要因素之一,对此国内外有不同看法。在仿真研究中考虑了隔离开关操作过程中的多次重击穿、间隙击穿电压的极性特性、概率特性及其随操作速度变化的特性,采用统计分析方法研究了隔离开关的速度对VFTO的影响,并与实测结果进行了对比。研究结果表明,在一定范围内当隔离开关速度较慢时,分闸后负载侧残压较低,合闸、分闸操作过程中产生的VFTO幅值也较低。
기체절연개관설비（gas insulated switchgear,GIS）내적격리개관재조작공재단모선시회발생다차격천,병산생특쾌속순태과전압（very fast transient overvoltage,VFTO）,엄중시가능조성변압기화기타전기설비적손배。격리개관적조작속도시영향VFTO적중요인소지일,대차국내외유불동간법。재방진연구중고필료격리개관조작과정중적다차중격천、간극격천전압적겁성특성、개솔특성급기수조작속도변화적특성,채용통계분석방법연구료격리개관적속도대VFTO적영향,병여실측결과진행료대비。연구결과표명,재일정범위내당격리개관속도교만시,분갑후부재측잔압교저,합갑、분갑조작과정중산생적VFTO폭치야교저。
During the switching of the disconnectors in gas insulated switchgear（GIS）,repeated strikes of the contact gap will lead to very fast transient overvoltage（VFTO） with high amplitude and steepness.Severe VFTO may damage transformers and other equipment.One of the important influential factors on VFTO is the switching speed of the disconnector,and there are still different opinions on this factor.In this paper the whole repeated strike process associated with the switching operation of the disconnector was simulated and analyzed.The polarity effect and the probability characteristics of breakdown voltage and residual voltage were analyzed.The impacts of the switching speed of the disconnector on VFTO were analyzed with the statistical method.Comparisons were made between simulation and measured results.The simulation result shows that within certain range of speed,disconnectors with low speed generate lower residual voltage after opening,and lower VFTO during opening and closing processes.