Re: Underground Distribution Cable

Aug 05, 2003 5 Replies
C

I have paper references (it may be in the Standard Handbook of Electrical Engineers). Have you tried big wire manufacturers like Southwire or perhaps Perelli (spelling?)?



Charles Perry P.E.



Anyone have a URL for UD cable electrical characteristics? Specifically
> 15 kV and 35 kV cables' shunt capacitive reactance.
>
> Google has only found a few technical articles and none of them seem to
> agree on values to a degree that would give me confidence in them. >
> Thanks in advance.
>
> --
> Paul Hovnanian mailto: snipped-for-privacy@Hovnanian.com
> note to spammers: a Washington State resident
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C

formatting link

Might help. Numbers are given as impedences (symmetric components).

Charles Perry P.E.

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C

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> I_1WEB.PDF

Specifically

This equation is from EPRI's Underground Transmission Systems Reference Book:

c = [(7.354 * e )/ log (Di/Dc)] * 10^-13 microfarads per 1000 ft (note log base 10, not ln)

with e = 2.3 for XLPE and Di the outer diameter in inches and De the diameter of the inner conductor in inches

I get 9.24 kohm per mile

I have a brother in the wire business. I will see what he says.

Charles Perry P.E.

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P

Thanks. Someone sent me a URL to an Austrailian cable company. Although their dimensions are different, applying the equation gives me numbers within a few percent of their tabulated data

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So it looks like the equations are working.

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C

Good luck finding any technical data on that site. I even registered and cannot get any technical data for URD. You have to request it from them via email or telephone. Poor website design.

Charles Perry P.E.

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