[time-nuts] GPS shielding by power lines?
David Ackrill
dave.g0dja at tiscali.co.uk
Sun Aug 10 12:05:47 UTC 2008
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)
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