摘要
绝缘子泄漏电流对绝缘子运行状态在线监测具有重要的意义,但泄漏电流信号易受到各种噪声的干扰,针对泄漏电流信号信噪比低及传统去噪方法去噪效果不佳的现状,利用广义S变换在非平稳信号处理方面的独特优势,将广义S变换应用到绝缘子的泄漏电流去噪中,在广义S变换高质量的时频分布平面中设计了一种阈值去噪和时频谱分布滤波相结合的新型时频滤波器,通过绝缘子泄漏电流高压试验和现场实测信号的去噪结果分析,验证了本文方法在绝缘子泄漏电流信号去噪中的有效性和稳定性。
The insulator leakage current plays an important role in the on-line monitoring of the in-sulator operating state,but it is vulnerable to different kinds of noise interference. For the low signal noiseratio of leakage current signal and the poor effect of the traditional existed de-noising method,with the uniqueadvantages of the generalized S transform at non-stationary signal processing,the generalized S trans-form is applied to the insulator leakage current denoising,based on the high quality of the generalized Stransform time-frequency distribution plane,a new time-frequency filter was designed with the combina-tion of threshold denoising and time-frequency distribution spectrum filter. Through the de-nosing test ofthe insulator leakage current measured signal in the high voltage experiment and the scene,the effective-ness and stability of the suggested method was verified in the denoising of insulator leakage current signal.
作者
吴朝晖
WU Chaohui(State Grid Shangrao Power Supply Company,Shangrao 334000,China)
出处
《电瓷避雷器》
CAS
北大核心
2018年第4期211-216,共6页
Insulators and Surge Arresters
关键词
广义S变换
绝缘子
泄漏电流
去噪
时频分布
generalized S transform
insulator
leakage current
de-nosing
time-frequency distribution
