悬浮颗粒局部放电综合作用机制的研究

Research on Synthetic Action Mechanism of Partial Discharge of Suspended Particles

局部放电往往是很多影响机制综合作用的结果,为了探索这些机制的单独作用,需要设置一些能够区分不同机制的放电形式,为此提出利用悬浮针模拟颗粒放电现象进行研究的方法。首先固定悬浮金属针和非金属针与主电极的不同位置,模拟颗粒畸变电场和颗粒阻碍放电通道的影响;然后和运动金属颗粒的电信号相位进行比较并进行机理分析。试验及分析结果表明:诸多机制的综合作用将会使得放电电流出现在电压上升沿和电压峰值附近;非金属颗粒虽然在起晕电压方面的影响不如金属颗粒那么大,但会通过积累的壁电荷影响放电电流的相位;自由运动颗粒的局部放电实际上受颗粒位置控制,呈现以局部击穿为主的放电现象。总之,悬浮颗粒不同机制的综合作用将导致最终的放电形式是电晕、局部击穿和介质阻挡放电分别或共同存在。

Partial discharge(PD)is often a result of synthetic action of many effect mechanisms.To explore independent action of different mechanisms,it is required to set discharge forms distinguishing different mechanisms,therefore,this paper presents a kind of research method by using suspended pins simulating particle discharge.Firstly,different locations of the suspended metal needle,the suspended non-metal needle and the main electrode were fixed to simulate effects of the distorted electric field and particles hindering discharge channels.Then phases of electrical signals of mobile particles were compared and mechanism analysis was carried out.Test and analysis results indicate synthetic action of different mechanisms will cause discharge current appear near to voltage rise edge and peak.Although non-metal particles have less impact on discharge inception voltage than that of metal-particles,phase of discharge current is affected by accumulated wall charges.PD of particles in free movement is actually controlled by locations of particles and mainly presents discharge phenomenon of partial breakdown.In conclusion,synthetic action of different mechanisms will result in respectively existing or co-existing discharge forms such as corona,partial breakdown and dielectric barrier discharge.