A Study on the Over-current Characteristics of IV Insulated Wire Sheath According to Accelerated Degradation

Si-Kuk, Kim; Su-Gil, Choi

doi:2018.32.2.48

Fire Sci. Eng. > Volume 32(2); 2018 > Article

Fire Science and Engineering 2018;32(2):48-56.
DOI: https://doi.org/10.7731/KIFSE.2018.32.2.048 Published online April 30, 2018.

가속열화에 따른 IV절연전선 피복의 과전류 특성에 관한 연구

김시국, 최수길

¹호서대학교 소방방재학과
²호서대학교 소방방재학과

A Study on the Over-current Characteristics of IV Insulated Wire Sheath According to Accelerated Degradation

Kim Si-Kuk, Choi Su-Gil

¹Dept. of Fire and Disaster Protection Engineering, Hoseo Univ.
²Dept. of Fire and Disaster Protection Engineering, Hoseo Univ.

요약

본 논문은 가속열화에 따른 IV절연전선 피복의 과전류 특성에 관한 연구이다. IV절연전선 피복의 절연열화를 위해 가속수명시험 모형 중 아레니우스 방정식을 이용한 가속열화실험을 진행하여 등가수명 0년, 10년, 20년, 30년, 40년 실험시료를 제작하였다. 그 후 실험시료 대상으로 허용전류 100%~500% 과전류를 인가하여 전선피복에서 최초 연기 및 탄화 발생시간을 측정하였고, 등가수명이 증가함에 따라 최초 연기 및 탄화 발생시간이 감소하는 것으로 나타났다. 세부적으로 과전류 270%에서 등가수명 0년을 기준으로 등가수명 40년의 전기화재 위험성이 3.2배 증가하였다. 또한, 과전류 255% 및 260% 인가 시 등가수명 40년에서만 탄화가 발생하여 가속열화에 따른 화재위험성이 비약적으로 증가하는 것으로 나타났다. 추가적으로 FT-IR과 SEM을 이용하여 IV절연전선 피복의 등가수명에 따른 특성 및 표면 변화의 차이를 확인하였다.

Abstract

This paper reports the results of a study on the over-current characteristics of IV insulated wire sheath according to accelerated degradation. In order to examine the degradation of a IV insulated wire sheath through insulation, acceleration degradation experiments were performed using the Arrhenius equation of acceleration life test models; test samples with equivalent lives of 0, 10, 20, 30 and 40 years were prepared. Then allowed currents with over-current of 100%~500% were introduced to measure the times of first generation of smokes and carbonization in the wire sheath, and it was found that the times of first generation of smokes and carbonization in the wire sheath decreased as the equivalent life increased. In more detail, when 270% over-current is applied, the electrical fire risk of equivalent life of 40 years increased by approximately 3.2 times based on equivalent life of 0 years. Also, when the over-current was 255% and 260%, carbonization occurred only in the equivalent life of 40 years, and the fire risk according to the accelerated degradation was increased dramatically. In addition, FT-IR and SEM analyzes were used to confirm the characteristics and surface changes of IV insulated wire sheath according to the equivalent life.

Key Words: IV insulated wire, Accelerated degradation, Over-current, Electrical fire, Fire risk