DocumentCode :
2321198
Title :
FRP hot stick flashovers during EHV live line work
Author :
McDermid, W. ; Swatek, D.R. ; Bromley, J.C.
Author_Institution :
Manitoba Hydro, Winnipeg, Man., Canada
fYear :
2003
fDate :
23-25 Sept. 2003
Firstpage :
7
Lastpage :
11
Abstract :
In 1997 a FRP hot stick flashed over during live line work at 550 kVac. A rigorous maintenance program was instituted and all FRP hot sticks used in live line work must now withstand an annual dielectric test at 105 kVdc per 305 mm with the surface wet consistent with IEEE Std 978. More frequent electrical tests are made using a hand held tester and limits have been set for the hydrophobicity of the surface. In spite of these measures a second flashover a FRP hot stick occurred during live line work at 550 kVac in 2002. Both flashovers occurred during work from the tower on "v" suspension insulators, the first at a temperature near the freezing point and the second at a temperature well below freezing. In both cases the wind was blowing from the conductor to the worker. Our investigation is trying to establish an adequate explanation for these events as well as corrective measures. The work to date is summarized in this paper. Industry standards for limits of approach are based on the switching surge withstand of air gaps and should not be equated to the minimum safe leakage distance of FRP hot sticks.
Keywords :
IEEE standards; air gaps; fibre reinforced plastics; flashover; high-voltage engineering; insulators; 105 kV; 305 mm; 550 kV; EHV live line work; FRP hot stick flashovers; IEEE standards; air gaps; annual dielectric test; extra high voltage; fibreglass reinforced plastics; freezing point; hand held tester; minimum safe leakage distance; rigorous maintenance program; surface hydrophobicity; surface wet; suspension insulators; switching surge; Air gaps; Conductors; Dielectric measurements; Fiber reinforced plastics; Flashover; Insulation; Poles and towers; Surges; Temperature; Testing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Technology Conference, 2003. Proceedings
ISSN :
0362-2479
Print_ISBN :
0-7803-7935-7
Type :
conf
DOI :
10.1109/EICEMC.2003.1247844
Filename :
1247844
Link To Document :
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