变压器油中典型局放信号超高频频谱特征的研究

Research on the UHF Frequency Characteristics of PD in Power Transformers

设计了一套基于超高频法的电力变压器局部放电检测系统 ,在实验室内对 5种变压器油中典型局放的超高频频谱特征进行了研究。研究结果表明 ,同种放电的频谱特征有很大的相似性 ,而不同放电类型的频谱特征则存在一定的差别 ,有明显的可分性 ,提取这些特征可用于局放类型的识别 ;放电量的大小仅对频谱的幅值有影响且不规律 。

The frequency characteristics of five types of partial discharge models in transformer oil are studied using a UHF PD detection system designed by the author. The results show that partial discharges of the same type have very similar frequency characteristics and those of different types have different ones, which can be used to recognize the type of PD.The results also indicate that the amount of PD has little effect on the wave form of frequency spectrum, but it does irregularly affects the amplitude of frequency spectrum.