flashover

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flashover

[′flash‚ō·vər]
(electricity)
An electric discharge around or over the surface of an insulator.
(engineering)
A condition occurring during a fire in a building in which the surfaces of everything within a compartment or room seem to burst into flame simultaneously.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

flashover

A fault in a reciprocating engine's ignition system. The high voltage in the magneto distributor jumps to the wrong terminal, resulting in the wrong spark plug firing with a consequent loss in power. Flashover can happen because of moisture in the distributor. It can also occur when an aircraft is flying at high altitudes and the air inside the distributor does not have sufficient density to be an effective dielectric.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
Markowska, "Danger of flashovers to electric equipment located on roofs of buildings struck by lightning ", in Proc.
The aim of this paper is to study the effects of lightning current waveshape on the flashover distance calculated based on constant area criterion, including all electromagnetic couplings between building components, and to relate the results to the separation distance estimated according to standard procedures.
"This, in turn, deteriorates the insulation, and that can cause flashovers and short circuits."
Not only do mining companies benefit by not having to shut down production when the equipment is being cleaned, but they also reduce the risk of flashovers, fires, and possible fatalities.
The fire erupted when alkaline toilet fluid leaked onto damaged Kapton wires, causing a flashover fire that destroyed power cables to both aircraft generators.
Even the Navy, which was the first to suspect a correlation between wire fires and Kapton, the first to document flashover in the laboratory, and the first to move toward a ban, won't acknowledge Kapton fires as a safety hazard.
Salt spray, industrial pollutants, and even desert sand, can lead to costly power interruptions due to arcing and flashover.
A long history of successful performance in highly contaminated areas has proven that Dow Corning's RTV silicone high voltage insulator coatings provide superior arcing and flashover protection in the most hostile environments.
Electrical stress results primarily from corona discharge (when the voltage gradient exceeds critical value), leakage current from the line and arcing or flashover discharge from the line to the support structure.
When the contamination is exposed to moisture, an electrolytic film can develop, leading to corona discharges, surface deterioration, dry band arcing and eventually to flashover. Ceramic and glass designs are particularly susceptible to this buildup, and in coastal areas or contaminated environments, they must be maintained by periodic washing or re-greasing with a dielectric grease.
He said: "After the deaths of three firefighters in 1996, training for backdrafts and flashovers was officially introduced.
Double glazing and a change in furniture materials means there is an increased risk of backdrafts and flashovers.