油纸绝缘局部放电超高频检测方法的研究

Ultra-high-frequency Detection Technique for Partial Discharge in Oiled-paper Insulation

针对传统的局部放电检测方法在线测量时易受外界干扰的问题,笔者在实验室建立了变压器中典型局部放电的模拟系统,并用超高频宽带和窄带测量系统对其测量,分析比较两种测量系统性能上的不同。经测量分析得出,超高频窄带检测方法对检测信号的中心频率和带宽可调,可以选择合适的频带来避开干扰测量,抗干扰能力很强;超高频宽带检测方法检测频带宽,可以检测到更丰富的局部放电信息。

Conventional on-line detection methods of partial discharge are interfered by surroundings, therefore some simulation models of typical partial discharge in transformers are constructed in laboratory, and the models are measured by both UHF narrowband and UHF wideband detection systems. The measurements indicate that for the UHF narrowband detection technique, the central frequency and the bandwidth of the measured signal are adjustable, so optimum central frequency and bandwidth can be selected to avoid interferences; and the UHF wideband detection technique can detect much partial discharge information due to its wider frequency hand.