Arnold Tibus wrote: > As long as the system is kept balanced a 3 phase energy transport > system does not need a 4th wire as the sum of all the currents in the 3 wires > (phase shift 120deg between the wires) is zero! > regards > Arnold, DK2WT
That is true Arnold, but in the UK (and in some other countries) we don't always have a completely balanced load. There are cases where two phase 11kV lines are run out to farms and other rural houses and, often the equipment connected at the farm/rural supplies isn't properly balanced either. The unbalanced current is connected to earth at the HV/LV transformer, as described previously. :-) Probably getting a bit OT now... Dave (G0DJA) _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
