Research on overcurrent heating characteristics of copper wires at different inclination angles.

Autor: Wang, Weifeng, Lu, Cuizhen, Ji, Xiaohan, Zhao, Xiangtao, Lyu, Huifei
Předmět:
Zdroj: Journal of Thermal Analysis & Calorimetry; Jun2023, Vol. 148 Issue 11, p4833-4842, 10p
Abstrakt: With the growing number of high-rise buildings and the increasing incidence of electrical fires, copper wire overcurrent has become a major factor causing disasters. Hence, it is imperative to investigate the heating law of copper wire overcurrent. To address the unclear overcurrent heating characteristics of copper wires at different inclination angles, an angle adjustment device (0°–90°) was designed to build an experimental system for simulating electrical fire faults. Using a FAST-M200 high-speed infrared thermal imager, the temperature information during heating of PVC copper wires (cross-sectional area: 2.5 mm2) was collected at various inclination angles, aiming to explore the temperature evolution law over the overcurrent heating process of the wires at various inclination angles, and analyze the effects of inclination angle on the stage stagnation time and fire current ignition time of the wires. The results show that under the overcurrent condition, the temperatures of copper wires with different inclination angles present a phased growth trend. When the inclination angle is fixed, the temperature feature points of copper wires appear in advance at different heating stages. After the insulating layer temperature reaches the pyrolysis limit, the inclination angle generates little effect on the copper wire stagnation time at each stage when the current is higher than 192 A. At an inclination angle range of 0°–75°, the wire ignition time decreases with the increasing inclination angle. Moreover, the findings provide a basis for the deductive inference of electrical fire occurrence and development as well as the investigation and identification of fire accidents. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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