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生活中,凡是导线与导线、导线与开关、熔断器、仪表、电气设备等连接的地方都有接头,在接头的接触面上形成的电阻称为接触电阻.导线连接时接头处理得好,接触电阻就小;连接不牢、接触松动或其它原因,使接头接触不良,则会导致局部电阻过大,发生过热,加剧接触面的氧化.接触电阻越大,发热越剧烈,温度不断升高,造成恶性循环,致使接触处金属变色甚至熔化,引起绝缘材料中可燃性燃烧,并引起导线附近的可燃物着火,造成火灾.
Life, where the wires and wires, wires and switches, fuses, instruments, electrical equipment, etc. have connections where the resistance of the contact surface is called the contact resistance. When the wire connection handle well, contact The resistance is small; connection is not strong, loose contact or other reasons, poor contact joints, it will lead to local resistance is too large, overheating, exacerbating the oxidation of the contact surface. The greater the contact resistance, the more intense heat, the temperature rising, Resulting in a vicious circle, resulting in contact with the metal discoloration or melting, causing flammable combustion in the insulation material, and cause the combustible material near the wire fire, causing a fire.