文章摘要
绝缘纸中空间电荷效应的模拟研究
Research on Effect Mechanism of Space Charge on Electric Field Distortion inside Oil-Paper Insulating Medium
投稿时间:2020-03-27  修订日期:2020-05-13
DOI:
中文关键词: 空间电荷  绝缘纸  双极性电荷输运模型  电场畸变
英文关键词: space charge  insulation paper  bipolar charge transport model  electric field distortion
基金项目:山东省重点研发计划(2019GGX102049)和山东省自然科学基金(ZR2017MEE078)资助项目
作者单位E-mail
冀章 山东科技大学 电气与自动化工程学院 17852026060@163.com 
李长云 山东科技大学 电气与自动化工程学院  
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中文摘要:
      为明晰空间电荷对油纸绝缘纸板中电场强度的畸变效应及纸板老化状态与空间电荷的作用机制,本文采用双极性载流子输运模型,对不同老化状态的绝缘纸板中的空间电荷特性进行了数值模拟。对于同一老化状态下的绝缘纸板施加直流电压时,纸板中会出现同极性电荷积聚现象,且正极性电荷的分布范围较负极性显著变窄;随着加压时间的增加,纸板中的电场畸变率亦呈增大趋势。当绝缘纸板老化程度加深时,其陷阱密度和陷阱深度均会增加,致使空间电荷在纸板的近电极侧大量积聚,进而削弱了纸板和电极边界处的电场强度,加剧了纸板内部的场强畸变;且绝缘纸板老化愈严重,空间电荷对电场的畸变作用愈突出,一方面使得绝缘纸板加速老化,同时容易诱发绝缘击穿故障。研究结果可为变压器油纸绝缘设计提供参考作用。#$NL关键词:空间电荷 油纸绝缘 双极性电荷输运模型 电场畸变#$NL中图分类号:TM464
英文摘要:
      In order to clarify the distortion effect of space charge on the electric field intensity of insulation paperboard and the effect mechanism of degradation degree of paperboard and space charge, this work adopts the bipolar carrier transport model to simulate the characteristics of space charge in insulation paperboard with different degradation degree. When DC voltage is applied to the insulation paperboard with the same aging condition, the mono-polar charge will accumulate in the paperboard, and the distribution range of positive polarity charge is significantly narrower than negative polarity. With the time increase of applied voltage, the electric field distortion rate in paperboard also increases. When the degradation degree of insulation paperboard deepened, both the trap density and trap depth will increase, resulting in a large amount of space charge accumulate in the paperboard adjacent both electrode sides, which further weakens the electric field intensity at the boundary of the paperboard and the electrode, and intensifies the field intensity distortion inside the paperboard. Moreover, the more serious the deterioration of insulation paperboard, the more prominent the distortion effect of space charge on the electric field. On the one hand, the degradation of paperboard will be accelerated, on the other hand, the breakdown fault of paperboard is prone to be induced. The conclusions can provide a reference for the design of oil-paper insulation.#$NLKeywords: space charge; oil-paper insulation; bipolar charge transport model; electric field distortion
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