過電流によって劣化な電線の熱擴散分布

カテゴリ: 部門大会

論文No: 4

グループ名: 【B】平成19年電気学会電力・エネルギー部門大会講演論文集

発行日: 2007/09/12

タイトル(英語): Temperature Diffusion Distribution of Electric Wire Deteriorated
by Overcurrent

著者名: Chung-Seog Choi (韓國電氣安全公社),Hyang-Kon Kim (韓國電氣安全公社),Dong-Woo Kim (韓國電氣安全公社),Ki-Yeon Lee (韓國電氣安全公社)

著者名(英語): Choi Chung-Seog(Korea Electrical Safety Corporation),Kim Hyang-Kon(Korea Electrical Safety Corporation),Kim Dong-Woo(Korea Electrical Safety Corporation),Lee Ki-Yeon(Korea Electrical Safety Corporation)

キーワード: thermal diffusion distribution|overcurrent|hybrid technologyhybrid technology|thermal diffusion distribution|overcurrent|hybrid technology

要約(日本語): This study presents thermal diffusion distribution of the electric wires when overcurrent is supplied to copper wires. And then, this study intends to provide a basis of knowledge for analyzing the causes of electric accidents through hybrid technology. In the thermal image distribution analysis of the electric wire to which fusing current was supplied, it was found that less heat was accumulated in the thin wires because of easier heat dispersion, while more heat was accumulated in the thicker wires. The 3-dimensional thermal image analysis showed that heat distribution was concentrated at the center of the wire and the inclination of heat distribution was steep in the thicker wires. When 81 A was supplied to 1.6 mm copper wire for 500 seconds, the surface temperature of wire was maximum 46.68℃ and minimum 30.87℃. It revealed the initial characteristics of insulation deterioration that generates white smoke without external deformation. In the analysis with stereoscopic microscope, the surface turned dark brown and rough with the increase of fusing current. Also, it was known that exfoliation occurred when wire melted down with 2 times the fusing current. With the increase of current, we found the number of primary arms of the dendrite structure to be increased and those of the secondary and tertiary arms to be decreased. Also, when the overcurrent reached twice the fusing current, it was found that columnar composition, observed in the cross sectional structure of molten wire, appeared and formed regular directivity.
As described above, we could present the burning pattern and change in characteristics of insulation and conductor quantitatively. And we could not only minimize the analysis error by combining the information but also present the scientific basis in the analysis of causes of electric accidents, mediation of disputes on product liability concerning the electric products.

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