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j.andrade
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Join Date: Jun 2011
Posts: 2

Current Density

06/26/2011 3:29 AM

The current density changewith the frequency, but does anyone have a table with recommended current densities as a function of the frequency?
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rakesh_semwal
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India - Member - New Member Engineering Fields - Electromechanical Engineering - New Member

Join Date: Oct 2006
Location: India, 200 Km. North of Delhi.
Posts: 1393
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#1

Re: Current density

06/26/2011 3:56 AM

Skin_effect

chart
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j.andrade
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Join Date: Jun 2011
Posts: 2
#2
In reply to #1

Re: Current density

06/26/2011 4:58 AM

Thank you very much for your answer, your help is appreciated.

I know that current density is limit for the skin effect but would be helpful to have a table that tells me the current density as a function of frequency, such as:

For example Cu:

Diametre of cable Frequency Current density

0,1mm 1kHz to 100Khz > 8A/mm2

0,1mm 100Khz to 1Mhz > 6A/mm2

....................

Have you got any kind of this table?
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Vinu_Answers
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Engineering Fields - Power Engineering - Power Engineering Passion Engineering Fields - Electrical Engineering - Engineering Passion India - Member - New Member

Join Date: Mar 2011
Location: Noida, (U.P.), India.
Posts: 99
Good Answers: 6
#3

Re: Current Density

06/27/2011 6:28 AM

Current density may increase at high frequencies because the total conducting region in a wire becomes confined near its surface, This is also called skin effect. If the wire is carrying high frequency currents, depending on its diameter, the skin effect may affect the distribution of the current across the section by concentrating the current on the surface of the conductor.

Above graph shows Skin depth vs. frequency for some materials, red vertical line denotes 50 Hz frequency.

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