Calculation method of power cable diameter (national standard calculation method) For power cable lines of different diameter lengths used in different places, we usually choose wire and cable according to different wire and cable diameters. The following cable diameter, cross-sectional area, and weight estimation formula can only be used as an estimate:
I. Estimating the weight of copper, iron and aluminum wires (kg/km)
Weight = sectional area × specific gravity S = sectional area (mm2)
1, copper wire W = 9S W = weight (kg)
2, aluminum wire W = 3S d = wire diameter (mm)
3, wire W = 8S
The actual copper has a specific gravity of 8.9 g/cm3, aluminum has a specific gravity of 2.7 g/cm3, and iron has a specific gravity of 7.8 g/cm3.
Second, estimate the weight by wire diameter (kg / km)
1, copper wire W = 6.98d2 ≈ 7d2
2, aluminum wire W = 2.12d2 ≈ 2d2
3, wire W = 6.12d2 ≈ 6d2
Third, estimate the wire diameter and cross-sectional area
S=0.785d2
How to choose the conductor cross section
First calculate the load distance (overhead line)
Load distance = power × length = PL P = power (kw) L = length (km)
Example: The distance between the xx workshop and the transformer of the power distribution room is 200m, and the power load is 200kw. How much square copper wire is required? If you change to an aluminum core, how big is the square?
Calculate the load distance first = 200 × 0.2 = 40kw / km
because
According to "copper wire: 2.5mm2 per kilowatt-km, aluminum wire: 4mm2 per kilowatt-km"
Copper wire 40×2.5=100mm2 Actually, 120mm2 is selected.
Aluminum wire 40×4=160mm2 Actually 185mm2 is selected.
Aluminum wire calculation section formula
Actual selection of 185mm2
Δu is the percentage of voltage loss (allowing the voltage loss to be 4% of the rated voltage) is typically 5%. Http://news.chinawj.com.cn
Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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