摘要
为了在时频域上更好地分析气体绝缘组合开关(gas insulated switchgear,GIS)设备的局部放电信号,介绍了2种经典的Cohen类和仿射类时频分析方法并针对该两种时频分析方法无法消除交叉干扰项的问题,又引入了一种基于信号重排理论的方法,对Cohen类和仿射类时频分析方法进行重排变换,以降低交叉干扰项的影响,提高信号时频聚集性和可读性。最后,将该重排时频变换方法应用于GIS局部放电信号时频分析中,用于抑制现场噪声干扰,提取局放脉冲发生的时间和频率信息。通过对仿真和现场采集的局放信号进行时频分析处理,发现经重排变换后的Cohen类和仿射类时频分析方法,可以获得更佳的时域和频域分辨率,验证了重排方法的有效性。
In order to analyze the partial discharge（PD） signal of gas insulated switchgear（GIS） in time-frequency domain,two kinds of typical time-frequency analyzing methods,the Cohen’s class and Affine’s class,are introduced.Besides,because of the interference of the cross-items inherent in the two time-frequency methods,another theory,the reassigned time-frequency distribution method,is described to reassign the Cohen’s class and Affine’s class distributions to decrease and restrain the influence of the cross items and increase the time-frequency domain resolution and the readability of PD signals.At last,this reassigned method is used in the PD signal time-frequency analysis for GIS to inhibit the noise on-field and pick up the information of time and frequency for the PD pulse.After the processing of the simulated and PD signal on-field,it is found that the better time and frequency domain resolution can be acquired,verifying the effectiveness of the reassignment method.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2010年第9期2236-2241,共6页
High Voltage Engineering
关键词
GIS
局部放电
重排时频变换
Cohen类时频分布
仿射类时频分布
交叉干扰项
GIS
partial discharge
reassigned time-frequency transform
Cohen’s class time-frequency distribution
Affine’s class time-frequency distribution
interference of cross items
