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Fire Science and Engineering 2002;16(1):39-44.
Published online March 31, 2002.
Standby Mode에서 출화된 콘센트의 화염 패턴 및 전기적 특성에 관한 연구
A Study on the Flame Pattern and the Electrical Properties of Electric Outlet Fired at Standby Mode
Standby mode에서 출화된 콘센트의 화염 패턴 및 전기적 특성에 대해서 분석하였다 탄화 패턴을 분석한 결과 불꽃은 약 50~70cm 정도 방사되었다. 가연물에 착화된 후 약 150sec 경과하였을 때 온도가 약 $300^{circ}c$까지 상승했으며, 화염은 ceiling jet을 형성하며 급속도로 확산되었다. 트래킹은 극간의 최단거리를 형성하며 이루어졌으며 저항 값은 약 100~300$Omega$을 나타냈다. 칼받이를 금속 현미경으로 분석한 결과 정상 부분은 비정질 구조를 나타냈으나, 트래킹에 의해 소손된 부분은 수지상 조직(dendrite structure)과 보이드(void)가 고르게 분포되어 있음을 알 수 있다. 용융된 칼받이를 SEM 및 EDX로 분석한 결고 ㅏ정상 부분과 용융된 부분의 구조와 조성 변화에 차이가 있다.
In this paper, we analysed the flame patterns and the electrical characteristics of the electric outlet which was fired at standby mode. The carbonized patterns indicated that the flame had spread about 50 cm to 70 cm. After the combustibles on wall started to burn, the temperature went up to about $300^{circ}c$ in 150 sec. The flame formed ceiling jet and spread quickly. The tracking was generated at the shortest distance between two electrodes and the resistance was about 100$Omega$ to 300$Omega$ As the result of analysis using metallurgical microscope, the normal part of a blade holder showed amorphous structure, but the melted part of a blade holder damaged by tracking showed dendrite structure and void evenly. When the blade holder of damaged outlet was analyzed by SEM and EDX, we found that the structure and components of the normal part were different from those of melted part.
Key Words: Standby mode, Carbonized patterns, Ceiling jet, Tracking, Dendrite structure

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