Talk:Aluminium-conductor steel-reinforced cable

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Skin effect[edit]

Skin effect is an radio frequency phenomenon, there is no significant skin effect at 50 or 60 Hz. Tabby (talk) 23:34, 7 December 2007 (UTC)

Okay, sorry, I saw this note after I restored the link just now. But there is an effect. At high currents in a cylindrical conductor, the electrons all repel each other, and there ends up being a net current deficit at the center for that reason, which ACSR exploits. (I'm pretty sure ACSR "works" -- that is, is effective -- even at DC.) So what's the right name for that skin effect phenomenon? —Steve Summit (talk) 17:21, 21 December 2007 (UTC)

I call this transformer action, being caused by the interaction of fluxes within the cable. This forces the current to the outer layers. Tests by V.T.Morgan ( IEEE Power Delivery July 2003, pp 859-866 ) on a 19 Fe 54 Al cable gave internal inductance of between 0.046 and 0.05 uH/m with currents between 100 and 1800 A. An theoretical all-aluminum cable would be 0.05 uH/m, without transformer effect. Hence steel is invisible at 60 Hz Donald.stuart (talk) 16:52, 9 July 2009 (UTC)

I believe the problem to be the article says the iron inner strands are below the skin depth. The issue however is the skin depth in steel is just very limited due to its high magnetic permeability, so the article should say something like "the skin depth of steel is so small it had a negligible effect on overall conductivity". The skin depth of the steel core should be calculated separately, then the limited conductivity as compared to the aluminum outer strands would become apparent. (talk) 13:14, 18 April 2012 (UTC)
The microscopic skin depth in the steel at AC means that it provides a negligible contribution to overall conductivity, but that's not the issue. The issue is how much is lost be removing the aluminium from the core to make room for the steel. (talk) 14:36, 17 January 2016 (UTC)