I have someone describing an opportunity to me that requires an
understanding of what he calls 'watless current' in a three-phase line
connected to a delta transformer primary with SCR switches on each of the
three lines.
Apparently, when there are no loads connected to the secondary, current is
measured on each of the primary legs.
The same current exists with inverse parallel SCRS's as with SCR's paired
with inverse rectifiers.
I thought that as long as the delta primary load is balanced that there is
supposed to be no current between phases. I do however expect there to be
current on each line with the SCR/Diode pair configuration. Why would there
be current flowing with a 6 SCR configuration?
Is there such a thing as watless current, is this what I am seeing, or is my
leg being pulled?

TIA,
Chris

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