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Reference: ISH2015_504

ISH Collection

Gas Heating in Positive- and Negative- Impulse Surface Discharges in Atmospheric Air



Flashover on the surface of dielectric materials gives extensive damage to the insulation system, resulting in reduced withstand voltage and system downtime as the damaged component is located and replaced. Therefore, the flashover on dielectrics has been studied for many years with the object of finding ways to reduce its incidence. Especially, a transition mechanism for streamer-to-leader is still the object of intensive experimental and theoretical studies. In the case of long-gap gaseous discharge, there is a proposed explanation that the transition-to-leader is occurred due to the joule heating of a streamer channel. While, there is no compelling explanation in the case of surface discharge. In this work, the change of gas temperature in positive- and negative- impulse surface discharge of streamer was measured by spectroscopic method in atmospheric air. In this experiment, a quartz glass having a conductive indium tin oxide (ITO) coated back-surface was used as an insulation material having a back electrode. The positive- and the negative- surface discharges on the quartz glass were generated by a positive- and a negative- impulse voltage in atmospheric air. The gas temperature in the surface discharge was assumed to be equivalent with the rotational temperature determined by (0-0) band emission spectrum of the N2 second positive system. As a result, the drastic increase of gas temperature in a positive discharge channel was confirmed when the discharge phase transformed to a leader. In addition, the increase of the gas temperature in the negative discharge channel was also confirmed.

File Size: 1,1 MB

Year: 2015

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