中文摘要：

深入探索油纸绝缘系统空间电荷的生成机理,研究硫腐蚀对油纸绝缘系统空间电荷生成及迁移的影响具有重要意义.为此,将不同质量分数腐蚀物（即0、0.05％与0.1％二苄基二硫（DBDS）的油纸绝缘系统在130℃下加速热老化得到油纸试品,采用电声脉冲法研究了样品的空间电荷注入、迁移和消散特性,分析了油纸老化与Cu2S沉积对油纸样品在加压和去压作用下的空间电荷总量变化规律的影响.结果表明：绝缘纸上沉积的Cu2S产物使得加压过程中试品阳极处的正电荷密度峰值显著增大,样品内部出现大量的正电荷.空间电荷总量随腐蚀质量分数的增加而增加,0.1％与0.05％ DBDS作用下空间电荷最大总量分别是无DBDS的样品电荷总量的2.37与1.5倍.另外,沉积产物也影响空间电荷的消散特性,质量分数越高消散速率越快.初步分析认为Cu2S沉积增加了绝缘纸内的陷阱密度分布,增大了空间电荷注入总量;减小了陷阱深度,提高了空间电荷的消散速率.

英文摘要：

It is very meaningful to investigate the formation mechanism of space charge as well as the effect of Sulfur corrosion on its formation and migration in oil-paper insulation system. To get the oil-paper insulation samples, the oil-paper insulation systems containing different benzyl disulfide（DBDS） mass fractions （0, 0.05% and 0.1%） were suf- fered from accelerated thermal aging under 130 ℃. The pulsed electro-acoustic（PEA）method was used to analyze the injection, migration, and dissipation characteristic of space charge, as well as the effects of aging oil-paper and Cu2S de- position on total amount of space charge in voltage-on and voltage-off process. The results show that the peak value of positive charge density at the anode within samples during the voltage-on process will increase obviously due to the Cu2S deposition o11 the insulation paper, the amount of positive charges will appear inside the samples, and the total amount of charge in samples will increase with the increase of corrosion mass fraction. For samples containing 0.1% and 0.05% DBDS, maximum of charge will increase by 2.37 and 1.5 times compared with samples without DBDS. On the other hand, the deposition also influences the decay properties of space charge. The higher DBDS mass fractions in samples are, the faster the speeds of decay rates of space charge will be. Preliminary analysis suggests that Cu2S deposition contributes to the increase of trap density distribution, increase of total amount of injected charge, decrease of trap depth, and increase of decay rate speed.