Homopolar impedance

[giordanonaval]

How can I calculate the Homopolar Impedance of a cable from the manufacturer data??
Thanks in advance
Martin

 

[electricpete]

As a guess I would say it is the same as the dc resistance.

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[giordanonaval]

Actually, it´s not the same.
Like an aproximation, Zo = 4 R1 + j 2 X1, but it´s not exactly that. So I would like to know who can I calculate it.
Thanks anyway

Martin

 

[electricpete]

can you explain what you mean by homopolar?

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[cuky2000]

Hi Pete,

Homopolar (same pole) is another name for Zero Sequence.
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Here is one way to calculate the cable impedance of underground cable.

http://cuky2000.250free.com/Cable_Seq_Impedance_UG1.pdf

 

[wareagle]

This site may help

http://www.kerite.com/catalog/catalogfiles/impedance_data_power.htm

 

[giordanonaval]

That´s right cuky2000. Homopolar = Zero Sequence.
Thanks cuky2000 and Wareagle. Both informations were useful.

 

[giordanonaval]

Cuky2000, do you have more information about the link that you posted??? I´m talking about the way to find GMD, Kn, etc.
thanks in advance
Martin

 

[cuky2000]

Giordanoval,

I hope the enclose links helps. The first one contains a calculation template to determine the GMD & GMR for typical taped shielded and multi-wire concentric neutral cables used for underground applications. The other two links are for typical cable data.

http://cuky2000.250free.com/GMR_Taped_Shielded_and_URD_Cables__Template_Calc_Rev0.pdf

[blue]NOTE: For cable data see to the enclose information:

http://www.generalcable.com/NR/rdonlyres/EB24851A-9F27-4E39-9315-CCE1865F3259/0/pg3435.pdf

http://www.generalcable.com/NR/rdonlyres/2EE1B961-8934-474E-BFB1-10516EC79C53/0/pg2529.pdf

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[giordanonaval]

Thanks again Cuky2000.
The links posted above (cuky2000.250free.com.......) are your papers? Is it posible to have all pages of them? I think they are very interesting.
thanks
Martin