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Journal of Korean Institute of Fire Science and Engineering 2001;15(1):108-115.
Published online March 31, 2001.
열적 스트레스 변화에 따른 600V 비닐절연전선의 특성 분석
최충석
한국전기안전공사부설 전기안전시험연구원
The Properties Analysis of 600V Grade Polyvinyl Chloride Insulated Wire with Variation of Thermal Stress
요약
본 연구에서는 600V 비닐절연전선에 열적 스트레스를 인가하였을 때 전선의 특성 변화를 분석하였다. 전선의 구조 분석에서 정상 전선은 표면에 방향성을 갖고 있으나, $400^{circ}c$ 이상에서 열화된 전선의 경우 탄화물, 크랙, 결정 등이 형성되었다. 정상 전선의 표면 조성은 Cu ; 100%였으나, $800^{circ}c$에서 열화된 전선의 단면 조성은 Cu : 78.89%, O : 21.11%를 나타냈다. 연동선의 시차주사열량 분석 결과 $700^{circ}c$ 이상에서 열화된 전선에서 새로운 반응 피크가 관측되었다. 절연물의 시차열 분석에서 $150^{circ}c$로 열화된 전선의 경우 정상 전선의 반응점보다 낮은 $264^{circ}c$에서 흡열 반응이 나타났다. 등선의 열화에 따른 산소 점유율은 $500^{circ}c$에서 약 20%이다.
Abstract
In this paper, we analyzed the properties change of electric wire when the thermal stress was applied to 600V grade polyvinyl chloride insulated wire (IV). In the structure analysis, normal wire has the properties of direction on the surface, but in case of deteriorated wire at above $400^{circ}c$, it formed the carbide, the crack and the crystal. The surface composition rate of normal wire was Cu : 100%, but the section composition of the deteriorated wire at $800^{circ}c$ showed Cu : 78.89%, O : 21.11%. In result of analyzing the differential scanning calory of copper wire, the new reaction peak was observed on the deteriorated wire at above $700^{circ}c$. In case of the deteriorated wire as $150^{circ}c$ at the differential thermal analysis, an endothermic reaction appeared at $264^{circ}c$ lower than the reactive point of normal wire. The occupation rate of oxygen according to the deterioration of copper wire is about 20% at $500^{circ}c$.
Key Words: 600V grade polyvinyl chloride insulated wire, Deteriorated wire, Differential scanning calory, Differential thermal analysis, Endothermic reaction
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