Cable current carrying capacity
When the cross-sectional area of the alloy conductor is 1.5 times that of copper, the electrical properties of the alloy conductor and the copper conductor are the same, and the same current carrying capacity, electric resistance, and pressure loss are achieved.
◆The electrical resistivity of aluminum alloy is between aluminum and copper, slightly higher than aluminum, and lower than copper. Under the same intercept flow rate, the weight of aluminum alloy conductor of the same length is only half of that of copper. If the conductivity of copper is 100%, the electrical conductivity of the alloy conductor is about 61.2%, the specific gravity of the alloy is 2.7, and the specific gravity of copper is 8.9, then (8.9/2.7) × (0.612/1) = 2, ie 2 The resistance per unit weight of copper is the same as that of an alloy of 1 unit mass. Therefore, when the cross-sectional area of the alloy conductor is 1.5 times that of copper, the electrical properties are the same, that is, the same intercepting current, resistance, and voltage as copper are achieved. loss.
◆ There are many factors affecting the interception of power cables, such as; line characteristics (such as working electricity, current type, frequency, load factor); structure of wire and cable (such as the structure of conductive core, number of cores, type of insulating material, shielding layer) And the structure and material of the inner and outer sheaths, the total outer diameter); laying conditions (such as laying in the air, laying in the pipeline, laying directly in the ground, laying in the underground channel, laying in the bottom); the maximum allowable working temperature and surrounding of the conductive core Environmental conditions (such as air and soil temperature, soil thermal resistance coefficient, proximity effect of surrounding heat sources).
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