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Why does DC/AC matter?  The heating loop is galvanically isolated from the supply by the use of the transformer.

Don't forget the R1 insulative effect of the still air around the conductor.  I can believe the burst vs continuous argument, even if we move to a very narrow pulse, say 0.5s, that's still only about 1MW which could be provided by the existing infrastructure.

by njh on Sun Dec 5th, 2010 at 11:13:31 PM EST
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Why does DC/AC matter?

You don't want nice strong impedances, especially with AC train control systems nearby.

*Lunatic*, n.
One whose delusions are out of fashion.

by DoDo on Mon Dec 6th, 2010 at 03:58:59 AM EST
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Isn't there a system that allow for ice melting by making pass a high frequency current through the cable?

As the cable impedance depends on frequency, increasing with frequency, even a low high frequency current results in heating the cable, without having to apply a high voltage.

I remember someone talking about that but I can't recall if it was applied on train catenaries.

by Xavier in Paris on Mon Dec 6th, 2010 at 11:55:55 AM EST
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I do not understand this statement.
by njh on Mon Dec 6th, 2010 at 06:23:04 PM EST
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