Thermal Properties of KIV Electric Wires Subjected to Compression Damage

Abstract

This study investigated the thermal properties of a KIV insulated wire subjected to compression damage. In the wire breakage measurement experiment for the compressed insulated wire, 25, 50, 75, and 95% compression damage were applied to the cross-sectional area of the wire using a compression testing machine, and a quantitative value of the applied load was derived. The applied load for 95% damage was found to be 110 kgf. An additional experiment was performed on the thermal properties of the wire cut by compression damage. At a current of 30 A, the maximum temperature of a normal sample was 28 °C and that of a sample with 95% damage increased by 31.9 °C to 59.9 °C within the same test time. At 45 A, the maximum temperature of a normal sample was 55.7 °C and that of a sample with 95% damage increased by 37.3 °C to 93 °C. At 60 A, the maximum temperature of a normal sample was 90.8 °C and that of a sample with 95% damage sharply increased by 103 °C to 193.8 °C. Because the wires of home appliances and electric devices are frequently used when pressed in daily life, caution needs to be exercised by using protective frames to prevent the compression of electric wires, and in turn prevent the occurrence of electric fires.