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When the wire and cable pass current, due to the presence of the conductor resistance, the current causes the conductor to have a thermal effect, which causes the temperature of the conductor to rise. At the same time, the medium around the guide body dissipates heat. The insulation temperature of the conductor or cable, the maximum allowable temperature td, must be greater than The maximum temperature of the surface of the current carrying conductor can make the insulating medium not burn, and it is necessary to select a more suitable conductor cross section.
2, according to the mechanical strength of the wires and cables to select a sectional <br> <br> distribution wires and cables in normal operation, since by its own weight and, rain, snow, wind Ice external influence of an external force, during the installation In order to ensure that no interruption of normal power supply and other accidents occurs due to wire breakage during installation and operation, the relevant departments have specified that the minimum mechanical strength of wires and cables should be maintained under various laying conditions. Cross section to select the cross section of wire and cable.
The selection of the cross-section of the cable must meet the thermal stability check based on the above principles.
3. Select the conductor cross-section according to the allowable voltage loss
In the power system, various electrical equipment changes the amount of electricity used as the working conditions change, such as machining, electric arc furnaces, lifts, and planers. Therefore, there is a certain difference between the actual voltage and the rated voltage of the electrical equipment, and the voltage difference allowed by various electrical equipment is within a certain range.
Actual voltage and power equipment of wire and cable
1. Select the conductor cross-section according to the allowable ampacity