4.5 Article

Impact of Concentration Gradient of Polarizable Species on the Electric Field Distribution in Polymeric Insulating Material for HVDC Cable

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TDEI.2011.5931072

关键词

HVDC; XLPE; by-products; permanent dipoles; polarization charges; heterocharges; space-charge; PEA

向作者/读者索取更多资源

The impact on the electric field distribution of a non-uniform concentration of polarizable species within cross-linked polyethylene insulation for High Voltage Direct Current (HVDC) cable is investigated. Two case studies are considered where the species are diffusing from the bulk of the insulation towards the interfaces or from the interfaces to the bulk. The first case is associated with diffusion of cross-linking by-products that are known to be permanent dipoles. The second case is associated with diffusion of polarizable species from the interfaces (semi-conducting screens in the case of cables). A diffusion model is applied and used to derive a general expression for the polarization charge. Diffusion of by-products leads to the formation of hetero polarization charges adjacent to the electrodes whereas diffusion of polarizable species from the interfaces leads to the formation of homo polarization charge. Overall, the impact on the field distribution of a non-uniform concentration of polarizable species is weak when compared to space charge measurements. This suggests that inhomogeneous distribution of dipoles is unlikely the dominant phenomenon behind the heterocharges build-up in non-fully degassed XLPE samples.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.5
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据