变压器局放宽频带监测及数字陷波去噪方法  

PD Online Measurement of Transformers with Wide Frequency Band Systemand the Noise Eli minating Method by Cascaded IIR Lattice Notch Digital Filter

作　　者：李剑[1] 王有元[1] 杜林[1] 杨洋[1] 宁佳欣[1] 

机构地区：[1]重庆大学高电压与电工新技术教育部重点实验室,重庆400030

出　　处：《重庆大学学报（自然科学版）》2005年第8期22-24,38,共4页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(50377045)

摘　　要：传统的局部放电测量系统频率带宽通常为数10kHz.随着计算机技术和信号处理技术的发展,宽频带测量系统比传统的局部放电测量系统具有更高的测量灵敏度,但同时容易受到外部强烈电磁干扰的影响.研制出50kHz^1MHz测量频带的大型电力变压器在线监测系统,主要采用前置信号处理系统和二阶级联格形数字陷波器抑制窄带周期性干扰.通过安装于220kV变电站的变压器局部放电监测系统实测信号分析表明,该系统能够有效提取放电脉冲信号,具有较高的抗干扰能力.The frequency band of conventional partial discharge （PD） measurement systems is selected just within several ten kilohertz. With the development of computer and digital signal processing techniques, wide frequency band （WFB） measurement systems have been used to detect PD in electrical equipment for its higher sensitivity. Nevertheless, the WFB measurement systems are easy suffered from the interference of strong field electromagnetism noises. A set of PD online monitoring system with frequency band from 50 kHz to 1 megahertz used for transformer is developed, in which pre-processing device and cascaded 2nd order IIR lattice notch digital filter are mainly used to suppress periodic narrow-band interference. With analysis of field monitored signal at a 220 kV substation, it is shown that the monitoring system not only can detect and extract the discharge pulse signal effectively, but also has the powerful capability of suppressing interference.

关 键 词：变压器 局部放电 宽频带监测 数字陷波器 

分 类 号：TM835[电气工程—高电压与绝缘技术]