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1. Calculation method and influencing factors of current carrying capacity of high-voltage cables. The calculation method of current carrying capacity of high-voltage cables is mainly based on factors such as conductor cross-section, resistivity, temperature coefficient, etc. The influencing factors include cable material, length, working environment temperature, etc. Calculation method Yushu Qiao: Based on conductor cross-section: The current carrying capacity of a cable is directly proportional to the conductor cross-section, that is, the larger the conductor cross-section, the greater the current carrying capacity. The calculation formula is Q=K × It, where Q is the current carrying capacity, K is the cross-sectional area coefficient of the conductor, and It is the cross-sectional area of the conductor. Consider resistivity: The resistivity of a cable directly affects its current carrying capacity, and the smaller the resistivity, the greater the current carrying capacity. The resistivity is affected by factors such as cable material and temperature. Combined with the key temperature coefficient calculation: The current carrying capacity of the cable varies with temperature, and the temperature coefficient is generally used to correct the calculated value. At higher temperatures, the current carrying capacity of the cable will decrease. Influencing factors: Cable materials: Cables made of different materials have different electrical and thermal properties, which affect their current carrying capacity. Cable length: The length of a cable can affect its resistance and heat dissipation performance, thereby affecting its current carrying capacity. Longer cables may experience a decrease in current carrying capacity d
2. Calculation of current carrying capacity of high-voltage cables
The calculation method of current carrying capacity of high-voltage cables is as follows: For cables below 35KV, you can refer to the common cable current carrying capacity comparison table, which usually lists the current carrying capacity of different specifications of cables under standard conditions.
. Alternatively, online computing tools can be used for calculation, which typically take into account factors such as cable specifications, materials, insulation types, etc. to estimate the current carrying capacity. For high-voltage cables of 35KV and above: calculations should be based on economic current density. The calculation formula is: maximum current carrying capacity=cable cross-sectional area x economic current density. Among them, the cable cross-sectional area refers to the cross-sectional area of the cable conductor, and the economic current density is a constant determined based on factors such as cable material and operating environment. In addition, the following points should be noted: the operating environment of the cable system: the burial depth of the cable, the mutual heati
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