NDLI: The influence of temperature on water treeing in polyethylene

Content Provider	IEEE Xplore Digital Library
Author	Wang Jin-feng Wu Jiang Li Yan-xiong Zheng Xiao-quan
Copyright Year	2011
Description	Author affiliation: State Key Lab. of Power Equip. & Electr. Insulation, Xi'an Jiaotong Univ., Xi'an, China (Wang Jin-feng; Wu Jiang; Li Yan-xiong; Zheng Xiao-quan)
Abstract	In order to study the influence of temperature on water treeing in polyethylene, low density polythene and peroxide cross-linked polyethylene are chosen as the testing materials. At room temperature (20°C), 40°C, 60°C and 80°C, liquid needle electrodes method is used for water tree development, and metallographic microscope is used for observation of water tree morphology. Meanwhile, sizes and initiation rates of water trees are counted. Experimental results show that water treeing is significantly influenced by temperature when it is above 60°C. Water tree initiation rates first decrease and then increase with temperature rising, water tree sizes overall show an up-going trend with ascending temperature, experiments on LDPE and XLPE get the similar results, but XLPE has better anti-water treeing performances than LDPE. Meanwhile, in order to investigate the mechanism of water tree initiation and propagation at different temperatures, mechanical properties of the two materials were tested at four temperatures respectively. Experimental results show that mechanical properties of materials dropped significantly with the increasing temperature. After analysis, we consider that the limitation of cross-linking to the formation of large crystal block and the enhancement of the mechanical properties of materials are the two main reasons for better anti-water treeing performances of XLPE than LDPE. Meanwhile, we consider that mechanical properties of materials descending, pore expansion and the accelerated movement of water molecules and ions are the reasons for the acceleration of water tree at high temperatures.
Starting Page	225
Ending Page	228
File Size	954463
Page Count	4
File Format	PDF
ISBN	9784886860743
e-ISBN	9784886860743
DOI	10.1109/ISEIM.2011.6826273
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-09-06
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	The Institute of Electrical Engineers, Japan
Subject Keyword	Trees - insulation Temperature Mechanical factors Temperature measurement Crystals Morphology mechanical properties water tree temperature low density polyethylene cross-linked polyethylene
Content Type	Text
Resource Type	Article

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