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Anonymous Poster

Busbar Design

06/20/2010 7:48 AM

How to calculate fault current of system?

Which are the data need to calculate fault current
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msamad
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Location: Houston, USA
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#1

Re: Busbar design

06/20/2010 10:18 AM

There are few methods available for fault current calculation.

They are:

(1) Per Unit method (most commonly used method)

(2) MVA method

(3) Point-to-Point method

(4) Ohmic Method

I would suggest you to follow one method first (don't mix up the methods). Here are some links that has step by step approach for various methods:

http://www.bussmann.com/library/docs/spd02/SPDSection07.pdf

http://ecmweb.com/mag/electric_shortcircuit_calculation_methods

http://www.bussmann.com/library/docs/EPR_Booklet.pdf

http://www.arcadvisor.com/faq/about_mva_method.html

http://www.mikeholt.com/freestuff.php?id=freegeneral

http://www.scribd.com/doc/6161773/Short-Circuits-Methods

The good software for short circuit calculations are ETAP (www.etap.com), EasyPower (www.easypower.com) etc. You can download the trial version.

-MS

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DamnGud EE
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Engineering Fields - Electrical Engineering - New Member

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Location: IEC Domain
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#3
In reply to #1

Re: Busbar design

06/21/2010 1:06 AM

Excellent Answer. Thank you for providing Links as well. Keep it Up Sir.

Regards,

DG EE

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kvsridhar
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#4
In reply to #1

Re: Busbar design

06/21/2010 2:45 AM

GA. Good links. May i add a couple more ....

schneider-electric/Technical_Publication/ect162.xml

and also the one of many CR4 threads ...

http://cr4.globalspec.com/thread/25962/Bus-bar-short-circuit-calculation

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DamnGud EE
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#5
In reply to #4

Re: Busbar design

06/21/2010 5:18 AM

Sir, Thank you for sharing the Schneider Link. It was quite Helpful.

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kvsridhar
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#6
In reply to #5

Re: Busbar design

06/21/2010 5:37 AM

Nice to see you taking so much ineterest in learning...maybe this will be good for you too... you may already have it, but if not ... schneider-electric/ect158.pdf

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Hameedullah Ekhlas
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Join Date: Feb 2010
Posts: 187
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#2

Re: Busbar Design

06/20/2010 1:58 PM

Mmmmm!

For fault analysis msamad has given excellent links.

On title, you have mentioned regarding to Busbar Design. For Busbar Design please consider the below steps:

1- choice of cross-section of conductor based on required normal current, given ambient temperature, specified permissible temperature rise

2- Calculation of temperature rise under short time current to see that it is in safe limits.

3- Calculation of electro dynamic forces per metre per given short circuit current.

4- Calculation of choice of support insulator on the basis of bending moment withstand value

6- design of insulator system, phase to phase clearance phase to ground clearance, creeepage

7- design of support structures

8- Design of clamps and connectors flexible joints

9- Manufacture full scale prototypes having adequate length typical bends, typical joints, connectors

10- Subjecting to type tests

11- Subjecting a typical busbar to field trials

12- Regular manufacture and routine tests.
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