Proceedings ArticleDOI
Characterization of Fast Flashover of External Insulation
W.M. McDermid
- pp 510-513
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TLDR
In this paper, a flashover mechanism has been identified that can occur at moderate values of relative humidity, with very low values of surface leakage current under direct voltages of negative polarity at gradients as low as 111 kVdc/m.Abstract:
During the investigation of the flashover of FRP surfaces a flashover mechanism has been identified that can occur at moderate values of relative humidity, with very low values of surface leakage current under direct voltages of negative polarity at gradients as low as 111 kVdc/m. A method has been developed to reliably generate such flashovers. The effectiveness of a preventive measure has been demonstrated.read more
Citations
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Journal ArticleDOI
Effects of tower, phase conductors and shield wires on the electrical field around a tower window during live-line work
Mona Ghassemi,Masoud Farzaneh +1 more
TL;DR: In this article, a three-dimensional electric field calculation model of a fiber glass-reinforced plastic (FRP) hot stick during live-line work based on the finite element method is proposed to account for the geometry of the Manitoba site incidents at 500-kV.
Journal ArticleDOI
Three-dimensional FEM electrical field calculation for FRP hot stick during EHV live-line work
TL;DR: In this article, the potential and electric field distribution along a fiberglass reinforced plastic (FRP) hot stick under dry condition and non-uniform wetting were determined using a commercial software, COMSOL MultiphysicsTM.
Journal ArticleDOI
Surface charging and its effects on DC flashover strengt of insulating materials
TL;DR: In this paper, the authors studied the DC charging characteristics of three different insulating materials and the flashover performance of such pre-charged insulating material and found that surface charging by cloth wiping is much more than that of corona discharges from energized objects.
Journal ArticleDOI
A coupled computational fluid dynamics and heat transfer model for accurate estimation of temperature increase of an ice-covered FRP live-line tool
TL;DR: In this paper, the authors explored the mechanism of tool surface wetting through coupled Computational Fluid Dynamics (CFD) and Heat Transfer mathematical equations for a FRP hot stick modeled in Commercial software, COMSOL Multiphysics.
Journal ArticleDOI
Experience with dielectric surfaces of FRP tools used in live line work
W.M. McDermid,D. R. Swatek +1 more
TL;DR: In this article, two flashovers of supposedly clean FRP hot sticks used in live line work were investigated. But the conditions that may lead to flashover were not identified and possible means of prevention were discussed.
References
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Journal ArticleDOI
Variable-voltage application for insulator pollution tests
TL;DR: In this paper, the speed and precision of salt fog contamination testing of insulators is improved using stepwise voltage application to give numerous flashovers in a single test and a similar technique for the clean fog method, which gives comparable results to conventional tests at constant voltage, is proposed.
Journal ArticleDOI
Investigation of the flashover of a FRP hot stick while in use for live line work at 500 kV
TL;DR: In this paper, the authors describe the live line work which was being done, the weather and the condition of the hot stick, and a series of tests were made to investigate factors which may have contributed to the flashover.
Proceedings ArticleDOI
FRP hot stick flashovers during EHV live line work
TL;DR: In this paper, a FRP hot stick was found to flash over during live line work at 550 kVac in 2002 and a second flashover occurred during live-line work at 650 kVAC in 2002, both occurred during work from the tower on "v" suspension insulators.
Proceedings ArticleDOI
Progress in resolving flashovers of FRP hot sticks during EHV live line work
TL;DR: In spite of improvements in the maintenance and testing of the hot sticks, a second flashover occurred during live line work at 550 kV AC in 2002 and a low level of surface pollution is believed to have been the cause of the more recent flashover as mentioned in this paper.