F
Fred Abse
Guest
On Wed, 10 Mar 2010 00:33:53 -0500, Jon wrote:
ability to design medium current switchgear?
at 240 volts, center tapped to ground/neutral. That isn't phase shifting,
it's phase splitting. Phase relationships are preserved wherever you put
the tap relative to either end.
a period) relationship.
What do you mean by "maximum peak-to-peak voltage"? That would depend upon
whether the voltage is varying. If the voltage is constant, the maximum
equals the average. Peak to peak voltage is 2 * V(RMS) * sqrt(2).
If you are referring to 3-phase *wye* connected supplies, phase-to-phase
voltage equals phase-to-neutral voltage times sqrt(3). This applies
whether you take RMS, peak, or peak-to-peak.
Evidence of sloppy thinking on your part.
Now tell me how to do wye/delta transformations.
--
"Electricity is of two kinds, positive and negative. The difference
is, I presume, that one comes a little more expensive, but is more
durable; the other is a cheaper thing, but the moths get into it."
(Stephen Leacock)
WTF has the ability to program geometrical graphics got to do with theWhat do I know?
What don't I know. Obviously more than all of you combined. Is there an
engineer in the house? Then find out where I went wrong with this
http://mypeoplepc.com/members/jon8338/math/
ability to design medium current switchgear?
WRONG! The two 120 volt supplies come from a single transformer secondaryI didn't go wrong with any of it. Then what makes any of you think I
know nothing about anything?
The 240 volts come from two 120 volt signals phase shifted by half a
period. Am I right? Am I wrong? How many of you know that? Or are you
just pretenders?
at 240 volts, center tapped to ground/neutral. That isn't phase shifting,
it's phase splitting. Phase relationships are preserved wherever you put
the tap relative to either end.
They are not shifted. They are *generated* with a 120 degree (one third ofWith 3-phase service, by what fraction of a period are each of the
phases shifted? ANSWER ME. What is the maximum peak-to-peak voltage?
a period) relationship.
What do you mean by "maximum peak-to-peak voltage"? That would depend upon
whether the voltage is varying. If the voltage is constant, the maximum
equals the average. Peak to peak voltage is 2 * V(RMS) * sqrt(2).
If you are referring to 3-phase *wye* connected supplies, phase-to-phase
voltage equals phase-to-neutral voltage times sqrt(3). This applies
whether you take RMS, peak, or peak-to-peak.
Evidence of sloppy thinking on your part.
Now tell me how to do wye/delta transformations.
--
"Electricity is of two kinds, positive and negative. The difference
is, I presume, that one comes a little more expensive, but is more
durable; the other is a cheaper thing, but the moths get into it."
(Stephen Leacock)