DocumentCode :
1148520
Title :
Comparison between water-treed and deteriorated regions. Electrical tree precursor
Author :
Rasikawan, S. ; Ishihara, H. ; Shimizu, N.
Author_Institution :
Dept. of Electr. Eng., Nagoya Univ., Japan
Volume :
1
Issue :
4
fYear :
1994
fDate :
8/1/1994 12:00:00 AM
Firstpage :
597
Lastpage :
603
Abstract :
When polyethylene is subjected to high fields in the presence of water, a water tree may be formed. However, under dry conditions a `deteriorated region´ is gradually formed before the initiation of an electrical tree. The experimental results suggest some similarities in structure and properties between the deteriorated and the water-treed regions. FTIR analysis shows that there are common polar groups in these regions. Scanning electron microscope observation found a number of microvoids in both regions. The formation of the deteriorated region increases the resistance to electrical tree initiation during subsequent ac ramp voltage and positive impulse voltage but decreases it for negative impulse voltage. Dried water-treed regions show the same effect
Keywords :
Fourier transform spectroscopy; electric breakdown of solids; impulse testing; insulation testing; life testing; organic insulating materials; scanning electron microscopy; FTIR analysis; ac ramp voltage; deteriorated regions; electrical tree precursor; microvoids; negative impulse voltage; polar groups; polyethylene; positive impulse voltage; scanning electron microscope observation; water-treed regions; Cable insulation; Chemicals; Electric resistance; Needles; Polyethylene; Region 5; Scanning electron microscopy; Steel; Trees - insulation; Voltage;
fLanguage :
English
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
Publisher :
ieee
ISSN :
1070-9878
Type :
jour
DOI :
10.1109/94.311702
Filename :
311702
Link To Document :
بازگشت