DocumentCode :
1120972
Title :
Effect of Hydrophobicity on Electric Field Distribution and Discharges Along Various Wetted Hydrophobic Surfaces
Author :
Gao, Haifeng ; Jia, Zhidong ; Mao, Yingke ; Guan, Zhicheng ; Wang, Liming
Author_Institution :
Tsinghua Univ., Shenzhen
Volume :
15
Issue :
2
fYear :
2008
fDate :
4/1/2008 12:00:00 AM
Firstpage :
435
Lastpage :
443
Abstract :
According to hydrophobicity and hydrophobicity transfer studies on silicone rubber surfaces, although the silicone rubber can transfer its hydrophobicity to various contaminants deposited on its surface, the hydrophobic states of water droplets on clean silicone rubber surfaces and on various contaminated silicone rubber surfaces were found to be different based on evaluation by contact angle measurement. Furthermore, surface discharge and aging of materials decreases the hydrophobicity of the surface. Focused on the difference of hydrophobicity and the effect of water droplets on the hydrophobic contaminated surfaces, some contrastive computations and tests of water droplets on various surfaces were carried out in this study. The results showed that the water droplets existing on the surface of silicone rubber materials might change the electric field and voltage distribution along the surface, and even reduced the initial voltage of the corona discharge, which was verified with a comparison test on a high voltage side of polymer insulator monitored by a photomultiplier tube (PMT) system. Since the leakage current provides much useful information to diagnose the state of outdoor insulation, this study investigates the time and frequency distributions of surface discharges on ceramic insulators, new room temperature vulcanized (RTV) silicone rubber coated insulators and aging RTV insulators with various hydrophobic states with the short time Fourier transform and Gabor transform methods. Then a correlation was found between the distribution of the spectrum of surface discharges and hydrophobicity via the joint time and frequency analysis of discharges on various hydrophobic surfaces.
Keywords :
Fourier transforms; insulator contamination; leakage currents; silicone rubber insulators; surface discharges; Gabor transform; ceramic insulators; contact angle measurement; corona discharge; electric field discharges; electric field distribution; frequency distributions; hydrophobic contaminated surfaces; hydrophobicity effect; leakage current; materials aging; outdoor insulation diagnosis; photomultiplier tube system; polymer insulator; room temperature vulcanized silicone rubber coated insulators; short time Fourier transform; silicone rubber surfaces; surface discharge; surface hydrophobicity; time distribution; voltage distribution; water droplets effect; wetted hydrophobic surfaces; Aging; Fourier transforms; Frequency; Insulation; Rubber; Surface cleaning; Surface contamination; Surface discharges; Voltage; Water pollution;
fLanguage :
English
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
Publisher :
ieee
ISSN :
1070-9878
Type :
jour
DOI :
10.1109/TDEI.2008.4483462
Filename :
4483462
Link To Document :
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