AC CURRENT RESISTANCE OF BUSBAR

From tables, DC Impedance is approx. 10.7 microhms/m at 20C. AC value will depend on frequency (skin effect).

sir roger ,

Kindly give me a formula for ac value

thank you

You can use some of the formulae here:-

http://www.copperinfo.co.uk/busbars/pub22-copper-for-busbars/homepage.shtml

As I said, it depends on the frequency - you have not stated.

You may also need :-

Temperature coefficient

b20 = 0.003947 per °C.

kINDLY ADVISE FOR HOW TO GET THE CORRECT TOTAL RESISTANCE . EXAMPLE : LET SAY A CALCULATED 1 PC OF BUSBAR SIZE 100X10MM , LENGHT 1 METER HAD 80 OHMS AND IF I APPLY TO USE COMBINED 3 PCS OF BUSBAR PER PHASE SAME SIZE HOW TO GET THE TOTAL RESISTANCE. WAITING YOUR REPLY

Well, you are asking Roger, hope he will answer. Hope you don't mind my answering also...

Resistance R in Ohms = ρ*L/A where ρ= resistivity, A=Cross sectional area and L=length. Given that ρ≈1.7μΩcm, the resistance of a 100x10mm copper bar, 1m long is not likely to be anywhere near 80 Ω. Was this just an figure of speech?

Then there is Skin effect, and if there are multiple bars, proximity effect also. Please read and check out the links given in post#2 also. They will help.

Use this link, it will come in handy ..

http://www.allmeasures.com/formulae/static/formulae/electrical_resistivity/12.htm

Also download and study this superb publication from Schneider Electric : http://www.schneider-electric.com/documents/technical-publications/en/shared/electrical-engineering/electrical-know-how/general-knowledge/ect83.pdf

any more advise for ac current resistance

Please study ECT 83. All your questions will be answered i think. Not only skin effect, but proximity effect also.

Good luck.

Enter "busbar sizing" into the "Search all of CR4" box to the right of the screen.

Dear All , Please advise how to calculate the resistance of busbar or cable incase . -3 pcs of copper busbar size 100x10mm per phase. OR 4pcs of cable size 95 sqmm per phase. waiting your advise.

Dear forum,

Please do free Electrical Engineering work for me. I am not qualified to do this myself but I do not want to hire and pay for a qualified person to do this.

I INSIST that you do it for me, NOW!!!

Get bent....

Wow, what a comparison. 100 x 10 x 3 = 3000mmsq. 95 x 4 = 380mmsq. DC resistance can be obtained from tables, but for AC use you really need to take a lot of other factors into account, none of which are mentioned. Please feel free to peruse the information provided in the links above to better aquaint yourself with the subject and then post again, if you need to.

Roger G.