수치해석 및 실험적 방법에 의한 케이블의 단선 특성에 관한 연구

Abstract

In this study, the fusing current behavior of fire resistant wire and cables were analyzed for reduce the risk of cable functional failure and electrical fires. The cable fusing current and time were measured as a function of current ramping rates, and 10 ∼ 30 times of allowable current using AC and DC power supply with high accuracy DAQ measurement system. Also, the FEM simulation and theoretical calculations(Onderdonk’s and IEC 60364-434 equations) will be performed to determine the validity and reliability of the experimental results. It was determined that the decreasing fuse time was directly proportional to the increasing current ramping rate and multiples of allowable current. The fusing time of non-insulated wire was similar to Onderdonk’s and IEC 60364-434 equations. However, the fusing time of insulated wire is later than the non-insulated wire. The fusing time of the cable and insulated wire did not coincided well with the numerical equation because the numerical equation did not consider the insulation material. The experiment results of the cable fusing time coincided with FEM analysis results of model 3.