4 May
2004
4 May
'04
12:11 p.m.
On Tuesday 04 May 2004 17:54, Tony Duell wrote:
There is no such thing as ground!.
Sure, there is. It's the voltage potential present on a long electrode
inserted into the earth. :)
240V three-phase is a delta setup, with the neutral
half-tapped
between two phases, giving 240V phase-to-phase, 120V
phase-to-neutral on two of the phases, and 208V phase-to-neutral
on the third one.
That doesn't sound much like what I think of as neutral - ie,
something that has zero nominal voltage to ground. If you've generated a 3-phase supply with one of
the phased
centre-tapped (as we're describing here) complelete isolated from
everything else (including ground), then you can ground any point of
it that you like -- including one of the phases or the centre-tap
point. Of course once you've picked a point to connect to ground,
then you can't ground any other point in the circuit as well.
Exactly.
Pat
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