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Quantitative Distribution of Created Voids by Applying General Flame and DC Short-circuit Current to 2.5 mm2 HIV

2.5 mm2 HIV에 일반화염 및 DC 단락 전류를 인가하여 생성된 기공의 정량적 분포 해석

  • Kim, Seung-Sam (Department of Fire Safety Engineering, Jeonju University) ;
  • Choi, Chung-Seog (Department of Fire Safety Engineering, Jeonju University)
  • 김승삼 (전주대학교 소방안전공학과) ;
  • 최충석 (전주대학교 소방안전공학과)
  • Received : 2013.01.24
  • Accepted : 2013.08.01
  • Published : 2013.08.31

Abstract

This study performed the quantitative distribution analysis of created voids to an insulator when applying general flame and DC short-circuit current to 2.5 $mm^2$ HIV (600 V Grade Heat-Resistant Polyvinyl Chloride Insulated Wires). The diameter of cross-section of HIV normal product and the radius of conductor were measured to be 3.3 mm and 1.8 mm. The exterior of HIV exposed to general flame showed severe carbonization and its interior exhibited voids created by dechlorination reaction. This study observed the characteristics that, when the shortcircuit current applied for 2 seconds from a DC 12 V lead battery, the conductor and neighboring insulator were melted, causing the insulator adhering to the conductor. On average, 87 voids were created on 10 mm of the HIV. The average diameter of voids was 0.25 mm. In addition, it was found that, when the short-circuit current applied for 4 seconds, the interior of insulator in contact with conductor severely carbonized and showed exfoliation phenomenon. On average, 47 voids were created, with more voids at the bottom. The average diameter of voids was 0.20 mm. When the short-circuit current for 6 seconds, most parts of upper part of conductor was carbonized, 20 voids were created. The average diameter of voids was measured to be 0.24 mm. It could be seen that the created voids received little influence by the type of energy source and the number of created voids was reduced as the energy supply time increased.

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