摘要
根据气体绝缘的金属封闭式组合电器(GIS)的波导结构及局部放电脉冲所激发的电磁波的宽频带特征,建立了外部天线超高频局部放电检测系统。利用该系统对252 kV GIS母线段中相同气压、不同电压超高频下固定微粒局部放电模型进行检测,并借助联合时频分析方法对信号进行处理。结果表明,外部天线超高频局部放电检测系统可以实现GIS局部放电检测,固定微粒局部放电频谱特征明显。
A new-type external antenna of ultra high frequency (UHF) partial discharge (PD) detection system is designed according to the wave-guide structure of gas-insulated metal-enclosed switch gear (GIS) and the wide band frequency spectral features of PD excited by electromagnetic waves. The fixed particle model of PD.in 252 kV GIS busbar is detected under the different voltage levels and the same SF6 pressure and then the joint time-frequency method (JTFA) is used to analyze these signals. The results indicate that this system can realize PD detection of GIS and the features of the fixed-particle PD can be obviously revealed.
出处
《电力系统自动化》
EI
CSCD
北大核心
2004年第1期41-44,共4页
Automation of Electric Power Systems
基金
原国家电力公司科技项目
关键词
金属封闭式组合电器
GIS
局部放电
超高频检测
气体绝缘
光电法
化学气体分析法
gas-insulated metal-enclosed switch gear(GIS)
partial discharge (PD)
ultra-high-frequency (UHF)
joint time- frequency analysis(JTFA)
