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In my interpretation (#14) I have assumed a 3 wire 3 phase system without a neutral - 3 lines used for distribution, 240V between lines. Also poor ground conditions for the flow of earth currents hence my use of the term 'local star point' and the implied consequence of relatively high impedance between local and transformer earths.
I could well be wrong - but it came from a comment in an IET forum on how the 120V was upgraded to 240V in rural areas. ( see mdhamish at IET Forums - Wiring in Spain - http://www.------.org/forums/forum/messageview.cfm?catid=205&threadid=6282)
I could not find much information on Spain's LV network other than Schneider saying Spain has 400V using 3 and 4 wire distribution.
Perhaps the OP can look out the window and tell us how many conductors he sees on any poles carrying the current to homes?
As you say - enough speculation.
I could well be wrong - but it came from a comment in an IET forum on how the 120V was upgraded to 240V in rural areas. ( see mdhamish at IET Forums - Wiring in Spain - http://www.------.org/forums/forum/messageview.cfm?catid=205&threadid=6282)
I could not find much information on Spain's LV network other than Schneider saying Spain has 400V using 3 and 4 wire distribution.
Perhaps the OP can look out the window and tell us how many conductors he sees on any poles carrying the current to homes?
As you say - enough speculation.