尘土颗粒带电对电接触故障的影响

Effect of Electrical Charges Carried by Dust Particles on Electric Contact Failure

对尘土颗粒的带电特性进行了研究,并探讨了颗粒带电对电接触故障的影响。结果表明,尘土颗粒所带电荷的总体变化趋势可用一个一元三次多项式表示,电荷分布呈现带状区域。对失效的连接器触点进行观察分析发现,电触点接触区附近的污染要高于非接触区的污染,污染物中主要为尘土。尘土污染会造成镀金微孔,并造成微孔腐蚀。

the characteristics of electrical charges carried by dust particles and their effects on electraic contact failure were introduced. The result shows that dust particles carried electrical charges, the trend of negative and posi- tive charges can be expressed as the single element three orders formula. Distribution of the charges carried by dust particle is a band. The failed connectors are inspected by scanning electron microscope and X-ray energy dispersive spectrometry, serious contaminants are detectcd at the contact interfaces, the major elements of dust such as Si, Al are found in the contaminants. Large numbers of pores are also found on gold plating surfaces. it is found that ele- ments of dust are underneath the pore. Dust may enhance the corrosion and cause high contact Tesistance.