Busbar Calculation [PDF]

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Busbar Dimension Calculation AMPERE REQUIRED

2886.75 AMPERE

1. Approximate DC Current Rating for Single Flat Bars (Apply Formula 4, Page 11) as per Copper Development Association Hand Book, approxiamte current rating of busbar shall be cariied out by Following methode Idc=7.73 x A ^ (0.5) x p (0.39) where I: Current Carrying Capacity, A A Busbar Cross Section Area, sqmm p Busbar Perimeter of conductor in mm Busbar Dimension Width Thickness Length Cross Section Area Perimeter I dc = I dc =

120 mm 15 mm 1000 Meter 1800 sqmm 270 mm

2b 2a

7.73 x 1800 2911.036 Amps DC

^(0.5) x

270

^(0.39)

2. Approxiamte AC Current Rating for Single flat bar Iac = Idc / (Rf/Ro)^0.5 Ro 1000 m = �20 x L / A where �20= resistivity of copper at 20 deg C, 1.724μΩ cm 1000 x 100 Ro 1000m= 1.724 x Ro 1000m=

9577.8 μΩ

/

18

WOW

Hence (f/Ro)^0.5= Rf/Ro= Iac =

72.25 1.01

where freq= [skin effect ratio] =

50 Hz 1.12

2896.589 Amps AC

3. RESULT CURRENT CARRYING CAPACITY OF THE ABOVE BUSBAR IS SUFFICIENT TO CARRY THE REQUIRED BUSBAR RATING

Resistivity of Copper at 20deg C

References

: copper-for-busbars-all-sections_Copper Development Association

a b s b

15 7.5 120 60 30 30 0.353553 0.707107