A Study on the Characteristics Analysis of Strands Melted by Over Current

과전류에 의해 용단된 소선의 특성해석에 관한 연구

  • Choi, Chung-Seog (Electrical Safety Research Institute(attached to KESCO)) ;
  • Kim, Hyang-Kon (Electrical Safety Research Institute(attached to KESCO)) ;
  • Kim, Dong-Ook (Electrical Safety Research Institute(attached to KESCO))
  • 최충석 (전기안전연구원(한국전기안전공사 부설)) ;
  • 김향곤 (전기안전연구원(한국전기안전공사 부설)) ;
  • 김동욱 (전기안전연구원(한국전기안전공사 부설))
  • Published : 2004.03.01


The PVC insulated flexible cords are used mainly as power supply cords of electric appliance. This electric wire is a stranded wire consisted of dozens of strands. In case stranded wires are disconnected by mechanical stress, it weakens electrically. Finally, the over current flows through stranded wires, and electrical fire occurs. In this study, we analyzed the melting properties of strands by over current, such as melting process, melting current and melting time. And we analyzed that quantity of heat for melting, a cross sectional structure, and surface structure by optical microscope and SEM. As analysis results, melting time decreased as melting current increased. And quantity of heat for melting was low, too. From the cross sectional structure of melted wire, when a melting current low and melting time long, it was found that the dendrite structure grew. However, the dendrite structure is hard to grow because growing time is not enough when a melting current high and melting time short.


stranded wire;melting current;melting time;dendrite structure


  1. 행정자치부 소방국, ' 소방행정자료 및 통계', 행정자치부, pp. 167-168, 2003
  2. 임의빈 외 5, '전기재해 통계분석', 한국전기안전공사, pp. 7-23, 2002
  3. Atila Mertol, 'Estimation of Aluminum and Gold Bond Wire Fusing Current and Fusing Time', IEEE Trans. on Components, Packaging and Manufacturing Technology, Vol. 18 No. 1, pp. 210-214, 1995
  4. 최충석 외 5, '과부하에 의해 변형된 비닐절연전선의 구조변화 분석', 한국전기전자재료학회 하계학술대회, pp. 398-401, 2002
  5. Norimichi Watanbe, 電源コードの半斷線箇所における放電形熊と發火危臉性,' 日本火災學會研究發表會 槪要集, pp. 202-203, 1994
  6. Eugene Lob, 'Physical Analysis of Data on fusedOpen Bond Wires', IEEE Trans. on Component, Hybrids and Manufacturing Technology, Vol. CHMT 6 No.1, pp. 209-217, 1983 https://doi.org/10.1109/TCHMT.1983.1136162
  7. Nasayoshi Nagata, 'Firing Current and Energy Input of Polyvinyl Chloride Covered Cords Having Disconnected Element Wrres', Bulletin of Japanese Association of Fire Science and Engineering, Vol. 33, No.1, pp. 1-2, 1983
  8. 송길목 외 3, "Overcurrent에 의한 PVC insulated flexible cord의 전기화재 해석에 관한 연구', 대한전기학회 춘계학술대회, pp. 131-133, 2003