油中局部放电检测脉冲电流法与超高频法比较

为了研究局部放电检测中超高频法参量与脉冲电流法参量之间的关系,比较分析了局部放电检测中超高频法和脉冲电流法在原理上的区别。利用脉冲电流法和超高频法对油纸绝缘的几种典型模型下的局部放电活动同时进行测量,比较分析同一模型下的局部放电中超高频法参量与脉冲电流法参量之间的关系并探讨了局部放电检测中脉冲电流法对超高频法的标定问题。研究表明,在反映放电活动强弱上,超高频法的参量和脉冲电流法的参量之间有着相同的变化趋势,但是二者之间不存在直接的线性关系。

Comparative Research on Current Pulse Method and UHF Measurements of Partial Discharge in Mineral Oil

In order to explore the relationship between parameters of UHF signals and discharge magnitude of pulse current in partial discharge(PD)detection in oil-paper insulating power equipment,the differences of principle between current pulse measurement and UHF measurement in PD is introduced.Four typical PD models are constructed,such as inherent vice discharge,oil-barrier discharge,surface discharge,floating electric potential metallic particle discharge,and pulse current signals and UHF signals are recorded simultaneously using an oscilloscope.The relationship of parameters between UHF and pulse current measurement is analyzed,and the calibration method for UHF with current pulse is discussed.The results show that UHF measurement and pulse current measurement have the same trend reflecting the change of PD level,but there is not direct linear relationship between parameters of UHF and pulse current measurement.