Abstract
In order to investigate the intrinsic recovery characteristics of SF6 an idealized model-breaker experiment is designed. The experimental simulation of the interruption phenomena offers the possibility to study the evolution of the free-decaying plasma dielectric strength against the recovery time. The effect of gaseous additives such as air, nitrogen and oxygen on the SF6 recovery characteristics has been researched. The obtained recovery curves show distinct phases as for pure SF6. The influence depends on the gaseous additive nature and its proportion to the gaseous mixture. The presence of water vapor (humidity) in the breaking chamber is proved to be a degradation agent of the SF6 insulating and recovery properties. Both dielectric and post-arc recovery studies show that the gas dielectric strength reduces with the increment of the humidity concentration. Copyright © 2005 John Wiley & Sons, Ltd.
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