The structure of wire and cable is not all the same, so when calculating the cross section and weight, the calculation method is not the same.
1. Round single line section and weight calculations:
(1) Single round single line of material:
Section F=0.25Ï€*d12 (mm2)
Weight W1=F*r=0.25Ï€*d12*r (kg/km)
W1 copper = 6.982 d12 (kg/km) W1 aluminum = 2.121 d12 (kg/km) W1 steel = 6.126 d12 (kg/km)
F—circular single-line cross-sectional area mm2 W1 --wire weight kg/km
d1—Circular single wire diameter mm r—Specific gravity of material used g/cm3
(2) Double wire:
1) Weight coefficient method:
W2=W1*K W2 Tin=W1 Copper*K=6.982d12 *K
2) Comprehensive weighting method:
W2=0.25Ï€*d12*r2 *(r-r1)/(r2-r1)
W2—weight of coating material kg/km K—coating weight coefficient See Table 1
d2—Diameter of coated single wire mm r – Specific gravity of plated material g/cm3
r1—The specific gravity of the inner material g/cm3 r2—The specific gravity of the plating material g/cm3 Table 1.
Wire diameter (mm)
K
Wire diameter (mm)
K
0.08-0.14
0.0525
0.85-0.95
0.0153
0.15-0.19
0.0366
0.96—1.10
0.0143
0.20-0.24
0.0304
1.11-1.35
0.0138
0.25-0.29
0.0268
1.36-1.67
0.0117
0.30-0.36
0.0240
1.68-1.75
0.0104
0.37-0.39
0.0220
1.76-1.81
0.0101
0.40-0.47
0.0202
1.82—2.00
0.0097
0.48-0.59
0.0198
2.01—3.51
0.0088
0.60-0.73
0.0178
3.52 and above 0.0078
0.74-0.84
0.0165
2. Profile section and weight calculation 1) Section and weight calculation of bare flat wire (1) Section F=a*b - f=a*b-[(2R)2-Ï€R2] = a*b - 0.358 R2 (mm2 )
(2) Perimeter C=2(a+b) - L=2(a+b)-(8R-2Ï€R) = 2(a+b) - 1.72R (mm)
(3) Weight W1=F*r (kg/km)
A—the thickness of the flat wire mm b—the width of the flat wire mm
R—the fillet radius of the flat wire mm r—the difference between the square corner and the fillet section mm2
L - The difference between the square and the roundness of the fillet mm F - The cross-sectional area of ​​the flat wire mm2
C—The perimeter of the flat wire mm r—The specific gravity of the material used g/cm3
2) Calculation of the cross-section and weight of double-ditch tram lines The double-ditch shape is used to calculate the cross-section of a car as a block-by-block method and then added together or measured using a planimeter. However, the nominal section can be used to calculate the weight.
(1) Copper tram line W=F*8.89 (kg/km) F—Nominal cross section mm2
(2) Aluminum alloy trolley wire W=F*r (kg/km) r—aluminum alloy specific gravity g/cm3
(3) Steel aluminum tramline wire W=W copper+W aluminum=F steel*r steel+F aluminum*r aluminum (kg/km)
(Refer to Table 12-5 of the Wire and Cable Manual Volume 2, page 709)
3) Weight calculation of cores for high-voltage cables (1) Hollow strand core diameter D
D=D0+2(tz+t bow) (mm)
(2) Weight W=(FZnZ+F bow n bow)*r*K (kg/km)
Tz, t bow-Z and arch line thickness mm D0 — oil passage diameter mm
FZ, F bow-Z-shaped and arched wire thickness mm nZ, n bow-Z-shaped and arched wire number r - Specific gravity of the material used g/cm3 K-core twist-in coefficient
1. Round single line section and weight calculations:
(1) Single round single line of material:
Section F=0.25Ï€*d12 (mm2)
Weight W1=F*r=0.25Ï€*d12*r (kg/km)
W1 copper = 6.982 d12 (kg/km) W1 aluminum = 2.121 d12 (kg/km) W1 steel = 6.126 d12 (kg/km)
F—circular single-line cross-sectional area mm2 W1 --wire weight kg/km
d1—Circular single wire diameter mm r—Specific gravity of material used g/cm3
(2) Double wire:
1) Weight coefficient method:
W2=W1*K W2 Tin=W1 Copper*K=6.982d12 *K
2) Comprehensive weighting method:
W2=0.25Ï€*d12*r2 *(r-r1)/(r2-r1)
W2—weight of coating material kg/km K—coating weight coefficient See Table 1
d2—Diameter of coated single wire mm r – Specific gravity of plated material g/cm3
r1—The specific gravity of the inner material g/cm3 r2—The specific gravity of the plating material g/cm3 Table 1.
Wire diameter (mm)
K
Wire diameter (mm)
K
0.08-0.14
0.0525
0.85-0.95
0.0153
0.15-0.19
0.0366
0.96—1.10
0.0143
0.20-0.24
0.0304
1.11-1.35
0.0138
0.25-0.29
0.0268
1.36-1.67
0.0117
0.30-0.36
0.0240
1.68-1.75
0.0104
0.37-0.39
0.0220
1.76-1.81
0.0101
0.40-0.47
0.0202
1.82—2.00
0.0097
0.48-0.59
0.0198
2.01—3.51
0.0088
0.60-0.73
0.0178
3.52 and above 0.0078
0.74-0.84
0.0165
2. Profile section and weight calculation 1) Section and weight calculation of bare flat wire (1) Section F=a*b - f=a*b-[(2R)2-Ï€R2] = a*b - 0.358 R2 (mm2 )
(2) Perimeter C=2(a+b) - L=2(a+b)-(8R-2Ï€R) = 2(a+b) - 1.72R (mm)
(3) Weight W1=F*r (kg/km)
A—the thickness of the flat wire mm b—the width of the flat wire mm
R—the fillet radius of the flat wire mm r—the difference between the square corner and the fillet section mm2
L - The difference between the square and the roundness of the fillet mm F - The cross-sectional area of ​​the flat wire mm2
C—The perimeter of the flat wire mm r—The specific gravity of the material used g/cm3
2) Calculation of the cross-section and weight of double-ditch tram lines The double-ditch shape is used to calculate the cross-section of a car as a block-by-block method and then added together or measured using a planimeter. However, the nominal section can be used to calculate the weight.
(1) Copper tram line W=F*8.89 (kg/km) F—Nominal cross section mm2
(2) Aluminum alloy trolley wire W=F*r (kg/km) r—aluminum alloy specific gravity g/cm3
(3) Steel aluminum tramline wire W=W copper+W aluminum=F steel*r steel+F aluminum*r aluminum (kg/km)
(Refer to Table 12-5 of the Wire and Cable Manual Volume 2, page 709)
3) Weight calculation of cores for high-voltage cables (1) Hollow strand core diameter D
D=D0+2(tz+t bow) (mm)
(2) Weight W=(FZnZ+F bow n bow)*r*K (kg/km)
Tz, t bow-Z and arch line thickness mm D0 — oil passage diameter mm
FZ, F bow-Z-shaped and arched wire thickness mm nZ, n bow-Z-shaped and arched wire number r - Specific gravity of the material used g/cm3 K-core twist-in coefficient