Photographic Investigations on Lightning Impulse Discharge Phenomena in Soil

カテゴリ: 論文誌(論文単位)

グループ名: 【B】電力・エネルギー部門

発行日: 2013/12/02

タイトル(英語): Photographic Investigations on Lightning Impulse Discharge Phenomena in Soil

著者名: Jinliang He (State Key Lab of Power Systems, Electr. Eng. Dept., Tsinghua University), Jun Yuan (Construction Department, State Grid Corporation of China), Bo Zhang (State Key Lab of Power Systems, Electr. Eng. Dept., Tsinghua University)

著者名(英語): Jinliang He (State Key Lab of Power Systems, Electr. Eng. Dept., Tsinghua University), Jun Yuan (Construction Department, State Grid Corporation of China), Bo Zhang (State Key Lab of Power Systems, Electr. Eng. Dept., Tsinghua University)

キーワード: breakdown mechanism，electrical breakdown，streamer discharge，positive streamer，negative streamer，electron avalanche

要約(英語): The impulse characteristics and breakdown mechanisms of soil are the fundament of grounding design for lightning protection. Photographic investigation using X-ray films is a useful means for studying the impulse characteristics and breakdown mechanisms of soil. Through a large number of tests, three types of streamer discharges, positive streamer, negative streamer, and negative feather and positive retrograde streamer, were found in sandy soil under negative impulse voltage in this paper. Basing on the streamer discharge theory of gas, the developing processes of streamer discharges in sandy soil are preliminarily described. These three types of streamer discharges in soil are very similar to those in gas, thus it strongly supports the electrical breakdown mechanism of soil. On the other hand, using X-ray film imaging technology we observed the discontinuous ionization phenomenon in the soil around the grounding electrode on which a surge voltage was applied. This phenomenon is formed due to the non-uniformities of soil dielectric properties and the shapes and sizes of air apertures. The soil breakdown under lightning impulse is mainly caused by the electrical breakdown of the air among the soil particles.

本誌: 電気学会論文誌B（電力・エネルギー部門誌） Vol.133 No.12 （2013） 特集：System Technical Performance（系統の技術性能）

本誌掲載ページ: 947-953 p

原稿種別: 論文／英語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejpes/133/12/133_947/_article/-char/ja/