[time-nuts] GPS shielding by power lines?

[David Ackrill]

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)