高频脉冲电流局部放电检测中干扰信号识别方法

Identification Method of Interference Signals in Partial Discharge Detection With High-frequency Impulse Current

高频脉冲电流法是变压器局部放电带电检测最有效的方法之一。现场进行高频脉冲电流局部放电检测时,存在干扰信号多、检测难度大的问题,如何有效地识别、排除干扰是高频电流局部放电检测的难点。分析干扰信号特点,重点论述了频率识别法、信号极性识别法以及结合特高频检测法识别干扰信号的方法,并结合局部放电案例验证所述方法在识别干扰信号方面的可行性和有效性。

One of the most effective partial discharge (PD) detection methods for transformers is the high-frequency impulse current PD detection.However,significant signal interference is a problem when carrying out high-frequency impulse current PD detection.Therefore,identifying the signal while rejecting the noises is essential in practicing this method.In this paper,the characteristics of interference signal are analyzed and the methods of frequency identification,signal polarity identification and interference signal identification combined with UHF detection are discussed and compared.Actual partial discharge detection cases are presented to demonstrate the feasibility and effectiveness of these methods in identifying the interference signals.