How to calculate the electric power between two busbars when short circuit fault

Your short circuit current will depend on the transformer or generator feeding busbar.. The current will only be as high as the generator or transformer will allow..

GO BACK TO SCHOOL COMPLETE 10+2(WITH PHYSICS,CHEMISTRY,MATHEMATICS)+4(ELECT ENGG) AND THEN YOU WILL BE ABLE TO CALCULATE PROBABLY.

Your question is not clear.

You have already indicated the current and the voltage, therefore electric power would be P=1.732 x V x I x Pf.

You should be concerned with Force of attraction between the busbars.This is mechanical force depends on the short circuit current,distance between busbars.The shortcircuit will also increase temperature of busbars after 3 seconds, you should be more concerned about this.

Detailed calculations can be worked out.

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A precise answers needs precise data but if you are looking for a quick estimate with a +/- 50% error, here it is.

I assume that you are looking for the temperature rise in the busbars during the 3 seconds of short circuit to see if the design meets the design limits.

Since you specified the short circuit current, take the busbars resistance from the data sheet times its length. The power is I2R. The energy is the power (W=J/S) X the time (S). You are left with the joules. Now, multiply the thermal capacity of the copper in degree C/J/Kg by the weight of the busbars and the number of joules previously calculated. This will give you the temperature rise. Add it to the ambient temperature at the moment of the short circuit and you will get the final temperature reached.

You can then calculate the elongation using the thermal expansion coefficient.

You don't need to worry about heat losses as they a negligible on such a short time.

The system voltage and the busbars distance is irrelevant to this crude power dissipation calculation but they will point you to the proper design standard and limits. You will certainly have to calculate the forces generated by the magnetic fields to make sure that the anchoring can take them.

Good luck and as the guest above suggested in a rude way, make sure that a competent power engineer makes these calculations if this is going to be used in any real application. Errors in this application can be lethal.

Next time, please format your question properly in order to get the best answer possible. You should invest as much time in your question than we invest in answering. We cannot read your mind but we are always happy to help.

I hope that this will help you.

Regards,

Marco

Your question is very unclear to say the least.

However, I tend to go with ramvinod because it sounds like you do have more important issues to worry about than the power between busbars.

In all if you want to know that you'd better first measure the connecting junction resistances between each of the busbar and the conductor connected to them.

Portable Appliance Test (PAT) primarily is about to make sure that your connection joints are well below 2Ohms and if you multiply I^2R then you would get an estimated power loss between busbars if there's a perfect short, but there won't be. Meaning that you will get enormous thermal as well as magnetic forces build up along the busbars long before you realise it, even if it is for 3".

Otherwise you need to clerify your Q/s 'cos it is hard to figure out what is going on in your mind.

No offence I hope.

cheers