摘要
如何有效地去除各种干扰是变压器局部放电在线监测系统的关键问题,介绍了用FFT和级联二阶IIR陷波器剔除周期性载波干扰,用小波包方法去除白噪声和用小波分解方法有效地提取内部局部放电脉冲。由于DSP可做FFT变换、IIR滤波和小波变换,因此把采集的数据先由DSP预处理,然后判断处理后的数据是否为有用放电信号,若是则传送到后台工控机进行二次处理。由于本系统采用了一种较新的设计,能够做到处理的实时性。
The key for the on-line PD(Partial Discharge)monitoring of power transformers is how to suppress the interference effectively.A method is introduced,which adopts FFT and cascaded IIR trapper to remove periodical carrier interference,applies wavelet packet to suppress white noise and uses wavelet disassociation to abstract inward partial discharge effectively.As DSP can fulfill FF T transforming,IIR filtering and wavelet transforming,it is used for sampling data pre-processing and effective discharge signal identification.The effective discharge signals are then transferred to background computer for further processing.A newer design is applied,which meets the real-time performance of data processing.
出处
《电力自动化设备》
EI
CSCD
北大核心
2004年第1期54-56,共3页
Electric Power Automation Equipment
关键词
局部放电
在线监测
变压器
partial discharge
on-line monitoring
power transformer
