[TowerTalk] Re: Lightning ground "Holy Wars"

Dave D'Epagnier DAVED@ctilidar.com
Fri, 29 May 1998 14:00:11 -0600


> > Flat copper conductors present a lower inductance path than round
> ones!
> 
> Can you give me a reference for that? I've been looking for years, 
> and find no data on conductor shape vs inductance.
> 
	I can Tom. Its a pretty well known fact in the industry that
ribbon conductors have lower inductance than round wires of the same
cross sectional area. In fact, the inductance of a ribbon of a given
width is roughly equivalent to the inductance of a round wire with
diameter equal to that width. In other words a 1" wide ribbon conductor
would have about the same inductance as a 1" diameter wire!

	The equations are:

	L=200*len*(ln(4*len/d)-0.75)   for round wire

	and 

	L=200*len*(ln(2*len/(a+b)+0.5)  for ribbon
	where:

	L = inductance
	len = length of wire
	d = diameter of wire
	a = width of ribbon
	b = thickness of ribbon

	The reference can be derived from data in Magraw Hill
Electronics Engineers' Handbook.

	regards,

	Dave

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