【摘要】 设计了一套基于超高频 (UHF)法的发电机定子局放检测系统 ,实验室研究结果表明该方法可检测到发电机定子各类局部放电 ,分析和比较了超高频信号在空气和金属导体中的传播规律。该系统与预先安装在某发电厂0 #机组上的方向传感器和中性点的电流传感器相结合 ,联合在线监测发电机的结果表明UHF法可准确检测到发电机中的局部放电信号 ,且信噪比极高更多还原

【Abstract】 In this paper,a measuring system for partial discharge(PD)is designed,and the testing results of laboratory experiments show that all kinds of PD of generator stator can be detected using this technique .The propagation characteristics of UHF signal in air and in metal conductor have been compared by this system. Furthermore,this PD measuring system is also fit for field monitoring,and the UHF sensor of this system has been combined with a directional sensor and a HF sensor in the neutral to carry on a on-line monitoring on a in-service generator. The testing results indicate that the UHF technique can precisely detect PD with high SNR.更多还原