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Fire Sci. Eng. > Volume 29(5); 2015 > Article
Fire Science and Engineering 2015;29(5):57-66.
DOI: https://doi.org/10.7731/KIFSE.2015.29.5.057    Published online October 31, 2015.
단일 및 복합 원인에 의한 단자대 전기화재위험성에 관한 연구
김시국, 금동신, 이춘하
1호서대학교 소방방재학과
2호서대학교 소방방재학과
3호서대학교 소방방재학과
A Study on the Electrical Fire Risk of Terminal Block Due to Single and Composite Cause
Kim Si-Kuk, Gum Dong-Shin, Lee Chun-Ha
1Dept. of Fire and Disaster Protection Engineering, Hoseo Univ.
2Dept. of Fire and Disaster Protection Engineering, Hoseo Univ.
3Dept. of Fire and Disaster Protection Engineering, Hoseo Univ.
요약
본 논문은 단자대에서 단일원인 및 복합원인에 의한 전기화재위험성을 규명하기 위한 연구이다. 우선적으로 단일원인인 접촉불량에 의한 화재위험성을 측정하기 위해 조임토크변화 및 접촉저항변화에 따른 열적특성을 분석하였다. 또한, 복합원인에 의한 화재위험성을 측정하기 위해 접촉저항변화에 따른 가속트래킹 실험을 실시하여 접촉불량과 트래킹의 화재연관성을 확인하였다. 실험결과 단일원인의 경우 접촉불량상태의 조임토크 및 접촉저항 크기가 증가할수록 열적특성이 뚜렷하게 나타나는 것을 확인할 수 있었고, 접촉저항변화에 따른 열적특성이 조임토크변화에 따른 열적특성보다 그 특성이 더 잘 나타났다. 또한, 복합원인의 경우 단자대 접촉불량과 트래킹은 상호연관성을 가지고 있으며, 두 가지의 복합적인 원인이 서로 작용될 경우 기존의 단일원인의 전기화재 위험성보다 상대적인 위험성이 더욱 높게 나타나는 것으로 도출되었다.
Abstract
This thesis is based on a research to investigate the electrical fire risk due to the single and composite cause in a terminal block. This paper analyzed the thermal characteristics depending on the screw torque change and contact resistance change to measure the fire risk due to the poor contact from single cause first. To measure the fire risk due to the composite cause, the acceleration tracking depending on the contact resistance change was experimented to check the correlation of poor contact and tracking to fire. The experiment result showed that the thermal characteristics were clearer as the screw torque in poor contact status and magnitude of contact resistance increased and that the thermal characteristics of terminal block depending on the contact resistance change was more reliable than the thermal characteristics depending on the screw torque change. Moreover, the terminal block poor contact and tracking were correlated in the case of the composite cause, and when two composite causes were interacted, the electrical fire risk was higher than the single cause.
Key Words: Electrical fire risk, Sing and composite cause, Terminal block, Poor contact, Tracking


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