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Time-resolved ablation of polymers exposed to ac arcs in air
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. ABB Corporate Research.ORCID iD: 0000-0002-6375-6142
2013 (English)In: 20th Symposium on Physics of Switching Arc 2013, FSO 2013, Brno University of Technology, Physics , 2013, 84-87 p.Conference paper (Refereed)
Abstract [en]

Polymers exposed to the radiation emitted by electric arcs generate vapours that are used to improve the interruption performance of electric switching apparatus. However, the basic physics of this process (known as ablation) under the broadband radiation spectra of electric arcs is not well understood. This paper presents measurements of time-resolved, ablation depth profiles of polymers (PA6-C6H11ON- and PMMA-C5H8O2-) exposed to the radiation of a single wall-stabilized arc ignited in a 5 mm air gap under AC currents with a peak of 2.5 kA. The profiles are obtained by exposing the surface of polymers moving with a velocity of 1 m/s, to the arc radiation through a 0.8 mm thick slit on one of the constricting glass walls. The measured profiles are correlated with the electrical and radiated power. It is found that there is a significant shift between the time-variation of the radiated power and the ablation depth, indicating that thermal decomposition is the main mechanism involved in the experiment.

Place, publisher, year, edition, pages
Brno University of Technology, Physics , 2013. 84-87 p.
Keyword [en]
Ablation, Decomposition, Electric arcs, Ablation depth, Broadband radiation, Interruption performance, Measurements of, Radiated power, Switching apparatus, Time variations, Time-resolved
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-147301ScopusID: 2-s2.0-84901800873ISBN: 978-163266010-7OAI: diva2:729192
20th Symposium on Physics of Switching Arc 2013, FSO 2013; Brno; Czech Republic; 2 September 2013 through 6 September 2013

QC 20140625

Available from: 2014-06-25 Created: 2014-06-25 Last updated: 2014-06-25Bibliographically approved

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