Bus Bar Calculation

What voltage?

Current = Power / Voltage

(Amps, Watts, Volts)

Would you help me to size the bus bar for following load:

type of bus bar= Aluminum bus bar

I=86000ADC

V=240

Total lenght=1300ft

load consist of 40 electrolytic Cells connecting in series to the bar.

Sorry, my friend, this is out of my league.

Please register with CR4, and ask the question (use the ASK A QUESTION button up on the top right corner). If you register, you're much more likely to get a good answer.

I'm pretty sure that you'll get a good response if you register. Looks like you've done a good job of expressing your problem, you've just got to get the rest of CR4 to notice it & take it seriously.

[For your information: I have education & background knowledge that could lead me to an approximate answer (informed guess ) - but no formal training or experience in high current stuff. Biggest wire I use/specify regularly is 2.5mm²].

Good luck & best regards,

John

Go to the Copper Development Association in the US.

www.copper.org

Hi,

For 11.93KW load, find out the total current depending upon the voltage system.

With 415V, 50Hz system, the total current will be approximately 16.7A.

If you use Cu for Bus bar, the current density is taken as 1.2A/Sq.mm. So the Area of Cross section required to caryy the current is = 16.7/1.2 Sq.mm. In Indian Standards, we use a minimum size of 25x3 Sq.mm of Cu.

And if Aluminium, it is 25x6 Sq.mm minimum. (Current density: 0.8A/Sq.mm)

You may transfer the data to your country standards.

first of all thank u for ur information , one more request in u sir, pl tell me the methods of calculating the current carrying, and the factors considering and other information, and calculating the current density for various materials

pl reply me on rocky4u712@indiatimes.com

Dear Kajajohn..

first you have to decide.. whether copper or Aluminium busbar is used..

Then the current., Voltage, frequency, Load factor, acceptable Temperature rise of busbar in the enclosure.. Ambient Temperature, short-circuit withstandlevel.. type of protection device and the relay settings for the busbars...Application - whether inductive loads or harmonic loads...

Well all the components ratings are decided on the above basic factors

Alluminium Bus bar

415 Volts

8000 Amp

50 Hz

45 deg C

Dear Guest,

What is the Transformer KVA rating,/ No of transformers ? Please tell your scheme in brief. I have application engineering till 6000A for Aluminium. But for currents like 8000A, i have observed copper busbars. I think a lower dimension Cu busbar can carry higher currents compared to aluminium of the same dimension.

Dear sir,

Current density for Cu and Al busbars are mentioned as 1.2 A/sqmm and 0.8 A/sqmm resp. Could you please give some reference for these data?

Are these data mentioned in IS?

would you pls tell me how to calculate current density or it it constant for all loads.i have doubt with it

The current density is the current through the bus-bar, divided by its cross-sectional area. The limit of current density depends on the material from which the bus-bar is made, and the geometry.

Of course yes. But i want to determine the area of bus bar which is current of the load/current intensity of bus bar for copper. SO i would like to know the current density of copper bus bar i have 1600A load so i need to determine bus bar area for this ok.

I don't have that data. Try here, here or here.

Bus-Bar Material - Alluminium

Length of Bus-Bar - 25mm

Thickness of Bus-Bar - 6mm

Then How much amp. and current will draw by Bus-Bar?

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