Modeling porous structure of oil-pressboard interface and its effect on electric field distribution

The oil-pressboard insulation is a typical composite insulation system widely used in the design and manufactory of large power apparatus. The implement of oil-pressboard insulation may lead to surface electrification and discharge at the interface under certain condition. It is of significant impor...

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Veröffentlicht in:Journal of Central South University 2015, Vol.22 (1), p.338-343
1. Verfasser: 司马文霞 姜赤龙 毛文奇 唐信
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creator 司马文霞 姜赤龙 毛文奇 唐信
description The oil-pressboard insulation is a typical composite insulation system widely used in the design and manufactory of large power apparatus. The implement of oil-pressboard insulation may lead to surface electrification and discharge at the interface under certain condition. It is of significant importance to take an insight into the phenomenon occurring at the interface. Through experiment, the pressboard is found as a porous material. The interface changes abruptly from bulk pressboard to the bulk oil as a result of the porous structure. A new model is proposed which divides the interface into bulk oil region, transition region, and bulk pressboard region. The width of the transition region is decided according to the microtome figure. The effective permittivity of the transition region is calculated using a new model based on fractal theory. The model is validated and compared with previous calculation model. The effect of the existence of transition region on the electric field distribution is discussed.
doi_str_mv 10.1007/s11771-015-2527-5
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subjects Engineering
Metallic Materials
压板
多孔结构
建模
接口转换
有效介电常数
电场分布
绝缘系统
计算模型
title Modeling porous structure of oil-pressboard interface and its effect on electric field distribution
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