基于聚类算法的脉冲电压绝缘老化实验漏电流检测方法  

Leakage current detection method in insulation aging experiment under pulse power based on cluster algorithm

作　　者：蒋存波[1] 王西乐 焦阳[1] 杨家志[1] 王怀红[1] 孔祥丽[1] 

机构地区：[1]桂林理工大学信息科学与工程学院,广西桂林541004

出　　处：《桂林理工大学学报》2016年第4期823-829,共7页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(51167004);广西自然科学基金项目(2011GXNSFA018022;2013GXNSFBA019250);专利支持项目(KY2015ZL100)

摘　　要：在绝缘加速老化实验中,一般将漏电流作为绝缘失效的判别标准。为了从回路电流检测信号中去除电容过渡过程电流从而获得漏电流值,设计一种基于相邻采样点距离进行漏电流判别的聚类分析算法。在双极性高频方波脉冲下电容过渡过程电流主要集中于方波脉冲边沿5τ以内,10τ后过渡过程基本结束,此后试样的回路电流可看为漏电流。据此电流变化过程及对应的数值关系,采用聚类分析的方法从采样周期数据中分类出漏电流数据,最后对漏电流数据求取平均值。仿真结果表明,在采样周期为51个以上时,采用该聚类分析算法得到的漏电流检测值相对误差在2%以内,可以有效去除电容过渡过程电流和随机噪声对漏电流检测的影响,较好地满足脉冲电应力绝缘寿命加速老化实验的要求以及提高实验结果的可靠性。The leakage current is taken as discrimination standard for insulation failure in insulation accelerated experiment.In order to obtain the leakage current by removing the capacitor transient current from the loop current detection signal,a cluster analysis algorithm that makes decision by use of the distance between neighbor sampling points is designed.Capacitor transient current is mainly concentrated in the time of square pulse edge＇0 ~ 5τ in the high-frequency bipolar pulse power accelerated aging experiment.The transient process is finished basically within 10τ and the loop current of sample may be regarded as the leakage current after that.Based on the current variety process and the corresponding numerical relations,cluster analysis can classify the leakage current data from the sampling period data and calculate the mean value of the leakage current data.The simulation results prove that on under this conditin the sampling periods are more than 50,the biggest relative error of the acquired leakage current by the cluster analysis algorithm is 2%.Thus it can eliminate the effect of capacitor transient process current and random noise on detection of leakage current effectively,meet the requirement of accelerated aging experiment under pulse electrical stress well and improve the reliability of the experiment result.

关 键 词：漏电流检测 聚类分析 绝缘寿命 

分 类 号：TP206.3[自动化与计算机技术—检测技术与自动化装置]