污秽绝缘子泄漏电流检测中滤波器的设计

Design of Fi1ter in Monitoring System of Leakage Current

国内外的大量研究表明,在湿润条件下污秽绝缘子的泄漏电流是表征污秽程度较好的特征量,为绝缘子运行状况提供重要信息,为了有效地检测绝缘子泄漏电流脉冲信号和工频信号,本文用Max274分别组成带通、低通滤波器对信号进行滤波,然后在软件上再进行数字滤波,分析并处理。本文对信号采用软件及硬件结合的预处理措施达到满意的抑制各种噪声和干扰的效果。

At home and abroad, lots of research shows that leakage current of contaminated insulators can represent contaminated degree in humid conditions. And it can provide important information for us. In order to detect the effect signal we make the lowpass and bandpass filtering based on Max274. The combinational way of software and hardware to pre-process the receiving uhrasonic signals demonstrates the capacity to suppress noise and interferences .