NDLI: Investigations of electrical trees in the inner layer of XLPE cable insulation

Content Provider	IEEE Xplore Digital Library
Author	Xie, A.S. Li, S.T. Zheng, X.Q.
Copyright Year	2008
Description	Author affiliation: State Key Lab. of Electr. Insulation & Power Equip., Xi'an Jiaotong Univ., Xianning (Xie, A.S.; Li, S.T.; Zheng, X.Q.)
Abstract	It is experimentally found that there are three kinds of electrical trees, the branch-like tree, the bush-like tree and the mixed tree combining the above two types in insulation inner layer of a 66 kV cross linked polyethylene cables. The mixed tree will appear in XLPE sample when voltage frequency is less or equal to 250 Hz, yet only one kind of electrical tree, i.e., the dense branch-like tree, will develop when the frequency is equal to or higher than 500 Hz. The reason is that both non-uniform crystallization and internal residual stress will exist in semi-crystalline cross linked polyethylene cable main insulation in the course of cable manufacturing. Based on analyses of fractal properties of these electrical trees, it is found that the propagation characteristics of electrical trees can be depicted by the growth time dependence of fractal dimension and the structure of electrical trees can also be classified by means of fractal dimension. Finally the explanation for these experimental results is given in the paper.
Starting Page	645
Ending Page	648
File Size	144795
Page Count	4
File Format	PDF
ISBN	9784886860057
DOI	10.1109/ISEIM.2008.4664490
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-09-07
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	The Institute of Electrical Engineers of Japan
Subject Keyword	Residual stresses Fractals Cable insulation Materials Insulation Stress Electrodes
Content Type	Text
Resource Type	Article

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