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Start Over Author "Liang, Xidong" Journal ieee transactions on dielectrics and electrical insulation
21 results on '"Liang, Xidong"'

3. Analysis of the acid sources of a field brittle fractured composite insulator

Author

Liang, Xidong and Dai, Jianjun

Subjects
Electric insulators -- Research, Business, Electronics, Electronics and electrical industries
Abstract

The brittle fracture (BF) surface of a 500 kV composite insulator was analyzed. It was operated for 6 years. Chemical compositions on the field failed BF surface were examined by X-ray fluorescence spectrum and FTIR spectroscopy. Test results showed that the chemical functional groups N[O.sub.3.sup.-], N[O.sub.2.sup.-], together with S[O.sub.4.sup.2-], were formed both on the BF surface of FRP rod and in the rust on end fitting near BF crack. Laboratory simulated BF by stress corrosion under nitric acid or sulfuric acid were all analyzed and compared with the field failed BF surface. Analysis of the field failed insulator reveals that the BF is influenced not only by nitric acid, which may be formed by electrical discharge, but also by sulfuric acid, which may come from acid rain. Index Terms--Composite insulator, brittle fracture, stress corrosion, FTIR.

Published
2006

15. Development of composite insulators in China

Author

Wang Shaowu, Guan Zhicheng, Liang Xidong, and Fan Ju

Subjects
Materials science, Fibre-reinforced plastic, Composite insulators, Silicone rubber, chemistry.chemical_compound, Electric power transmission, chemistry, Natural rubber, visual_art, Pollution flashover, Forensic engineering, visual_art.visual_art_medium, Arc flash, Ceramic, Electrical and Electronic Engineering, Composite material
Abstract

The development of composite insulators in China dates back to the early 1970's. In the 1990's they have become widely used in China. At present, up to 600000 composite insulators are operating on 35 to 500 kV ac overhead transmission lines. They are to be introduced into the 500 KV HVDC transmission schemes. In China all composite insulators in service are silicone rubber and are operating in various Contamination conditions. They have successfully and efficiently avoided serious pollution flashover, which occurred frequently when conventional ceramic insulators were used, and radically reduced the maintenance cost of transmission lines in pollution areas. Study of composite insulators is very active in China. The main aspects include properties of materials such as silicone rubber and fiberglass reinforced polymer (FRP) rods, electrical and mechanical performance, aging as well as evaluation and inspection of composite insulators. These fruitful works greatly promote the development of composite insulators in China.

Published
1999
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