Heat resistant and high temperature wires and cables are generally determined by two requirements. The first is that the environment temperature of the wires and cables is high, and the cable can normally transmit signal or electric energy under high temperature for a long time; the other is the power transmission cable, which is mainly aimed at increasing the current interception capacity.
Cable working in high temperature environment. The common cable is easy to produce insulation aging and scorching phenomenon when it is in high temperature. The cable is damaged and can not be used. High temperature cable can work normally and stably at rated high temperature, and the transmission performance of signal or electric energy is not affected, and the cable can also be guaranteed with long service life. This kind of functional cable is the most common high temperature cable, and the use characteristics are also the easiest to understand.
The purpose of the high temperature cable is to reduce the outer diameter and weight of the cable and to develop to lightweight. Generally speaking, the higher the operating temperature of the cable, the greater the carrying capacity of the same cross-section cable. For example, in aircraft and automobile, the significance of reducing weight is quite great, and the use of high temperature cable greatly reduces the cross-section. The operating temperature rises from 90 ℃ to 155 ℃, and the current carrying capacity increases by 50%. Under the same load flow, the weight of cable should be reduced by half and the cost will be reduced. Of course, the high current cutoff, most insulation materials will also increase the electrical energy loss.