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Commentator

Join Date: Jul 2008
Posts: 56

# aluminium bus bar current carrying capacity

07/18/2008 12:55 PM

rating of generator 3phase=3000KW

voltage=420v

current=5155A

pf-0.8

now what will be the size of conductor to carry this huge amount of current.

if lenght we have 13 meter.

what is the effect of lenght over current carrying capacity. I know length is inversely proportional. but this is not enough, what is the current drop over per unit lenght.

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Guru

Join Date: Jun 2007
Location: chennai,India
Posts: 586
#1

### Re: aluminium bus bar current carrying capacity

07/19/2008 1:15 AM

You have posted the same query in many number of ways.

I have requested you to reply the application but you have not responded.

However i give some relavant details.

Since the current is very high ,it would be advisable for you to go in for Busduct with Aluminum Enclosure and Aluminium Busbar.

Aluminum Bus bars are to be in Flat form.You should have 4 runs of 200 x 12 mm Aluminum Flats per phase.

For 13 met length voltage drop will be very nominal within 2.0 %

__________________
Ramesh,Freelance Electrical/automation Consultant
Commentator

Join Date: Jul 2008
Posts: 56
#2

### Re: aluminium bus bar current carrying capacity

07/19/2008 3:43 AM

I m thankful to u...for ur's reply.

I m satisfied with the data given by u. But sir, I m more consern with the method of calculation. plz let me know. and how u find the voltage drop will be only 2.0% for 13 meter.

and I m asking for apology to not replied last.

Guru

Join Date: Jun 2007
Location: chennai,India
Posts: 586
#3

### Re: aluminium bus bar current carrying capacity

07/19/2008 3:57 AM

This is only basics of Electrical engineering.-Ohms law.

Voltage drop= Cureent X Impedance.

(Vd=I x Z)

Current is known to you.

Z- Impedance -Based on material,configuration,cross section etc.

Calculate Z per meter then arrive at for 13 metres.

You have to do the homework please.

__________________
Ramesh,Freelance Electrical/automation Consultant
Anonymous Poster
#5

### Re: aluminium bus bar current carrying capacity

03/16/2010 6:36 AM

Can u tell me the impact of length on Current carrying & Voltage drop in Bus Ducts. Usually for cable we mention about voltage drop but for Busduct no such restrictions are said. y So.

Anonymous Poster
#4

### Re: aluminium bus bar current carrying capacity

10/30/2009 3:26 AM

My point of view 4 runs of 200X10mm Al conductor is enough

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