基于宽频带电流传感器的开关柜局部放电检测方法研究  

Research on Switchgear Local Discharge Detection Methods Based on the Broadband Current Sensor

作　　者：韦湛兰 李鹏[2] WEI Zhanlan;LI Peng(Institute of Intelligent Manufacturing Engineering,Baise Vocational College,Baise Guangxi 533000,China;Ocean Engineering College,Guilin University of Electronic Technology,Beihai Guangxi 536000,China)

机构地区：[1]百色职业学院智能制造工程学院,广西百色533000 [2]桂林电子科技大学海洋工程学院,广西北海536000

出　　处：《传感技术学报》2024年第3期545-550,共6页Chinese Journal of Sensors and Actuators

基　　金：2020年度广西高校中青年教师科研基础能力提升项目(2020KY48006)。

摘　　要：开关柜局部放电信号的采集会受到噪声信号的影响,导致开关柜局部放电检测准确性较差,为此提出基于宽频带电流传感器的开关柜局部放电检测方法。该方法将宽频带电流传感器放置在开关柜的零序电流互感器处,采集宽频带电流,结合独立分量分析方法和经验模态分解方法,消除噪声信号对局部放电检测产生的影响,提取去噪后宽频带电流的集中度特征,将其输入更新后的高斯混合模型中,实现开关柜局部放电检测。实验结果表明:所提方法的电流检测误差在0.1 mA以内,错分率小于0.25%,放点检测耗时为23.5 s。证明了所提方法对开关柜局部放电检测的准确性及效率均较好,能够有效保障开关柜运行的安全稳定性。The acquisition of switchgear partial discharge signal will be affected by the noise signal,resulting in poor accuracy of switchgear partial discharge detection,therefore,a switchgear partial discharge detection method based on a broadband current sensor is proposed.The wide-band current sensor is placed at the zero-sequence current transformer of the switchgear to collect the wide-band current,the independent component analysis method and the empirical modal decomposition method are combined to eliminate the influence of the noise signal on the partial discharge detection,and the concentration characteristics of the wide-band current after denoising are extracted and input into the updated Gaussian mixture model to realize the switchgear partial discharge detection.The experimental results show that the current detection error of the proposed method is within 0.1 mA,the error rate is less than 0.25%,and the time required for discharge detection is 23.5 s.It proves that the accuracy and efficiency of the proposed method for partial discharge detection of switchgear are good,which can effectively guarantee the safety and stability of switchgear operation.

关 键 词：开关柜 局部放电检测 宽频带电流传感器 独立分量分析方法 经验模态分解方法 

分 类 号：TM591[电气工程—电器]