Dear Electrical Engineers and All ,
Here i have mentioned the calculated value of current rating for Copper busbar can anyone of you can crosscheck and tell me is it correct, as am not an Electrical engineer please help me out with this
Thanks in Advance :)
Current density 2 A/mm2
Length of busbar 1176 mm
Width of bus bar 300 mm (assumed)
Thickness of bus 16 mm (assumed)
|
Cross-sectional area |
4800.0 |
mm2 |
If the temperature rise of the conductor is 50°C above an ambient of 40°C and the resistivity of the copper at 20°C is 1.724 mWcm, then the above formulae become: |
|
Length |
1176 |
mm |
(i) Flat bars: |
| | |
I = 1.02* {(A
0.5 P 0.39 Ө0.61) / ((1.05+αӨ) ρ) 0.5} |
|
Temperature coefficient of copper at 20
oC ,α |
0.0068 |
(
oC)-1 |
|
where I = current, A |
|
A = cross-sectional area, mm2 |
|
p = perimeter of conductor, mm |
|
q = temperature difference between conductor and the ambient air, °C |
|
a = resistance temperature coefficient of metal at the ambient temperature, per °C |
|
r = resistivity of copper at the ambient temperature, mW cm |
|
|
Resistivity of metal at 20
oC ,ρ |
1.72E-06 |
Ω.cm | |
|
Temperature difference ,Ө
(Temp. rise=40oC
Ambient Temp.=32oC) |
8 | | |
|
Current rating |
3958.81 |
A | |
|
Actual current passed |
5890.44 |
A | |
Since Required current value is not matching with the current rating , what should i do now to acheive current rating ? .
Also TWO copper bus carrying same current of 5890.44 A how far it should be spaced in-between ?
Copper Busbar Calculation Doubts
Re: Copper Busbar Calculation Doubts
