Ludivina72 on August 16th, at 3: Police stations are full of processes about foreigners who deceived by the individuals who accompanied them.
OP 11 Sep 06 Rbulsara, The link shows one design that would not work with delta power. Grounded wye would allow lower voltage ratings than would be necessary on other types of systems.
I am afraid not. It is most likey what davidbeach and I are suspecting. You need to talk to the manufacurers to give you their reasoning. I agree that the only conceivable difference would be in the ratings of the power devices in the bridge.
I know this is done by some manufacturers of Medium Voltage solid state equipment because it makes a fairly substantial difference in component cost and count, but for V VFDs?
That would mean they are finding diodes rated for only PIV? Wow, now that 3 minute thesis uts getting cheap! Then again, to some bean counters those few cents may mean the world. Ludicrous if you ask me. You can't get any more of an imbalance that having one phase completely missing.
I have seen this a lot. We have quite a few V ungrounded Delta systems in the US, this has always been problematic with respect to GF tripping. GF tripping would not burn up drives A higher than rated voltage would, I think.
Trust me, I do not pretend to be an expert in VFD manufacturing. As for bin counters Are you saying that V 3ph power in North America is almost always delta source, ie, floating with no neutral?
I'm learning some things in this post too. Loss of a phase, for correctly sized devices in a rectifier, will not cause them to get damaged either.
They may or may not work but will not burn up.
Much of this is supplied by an open, delta secondary transformer bank. There may be some corner grounded V delta and some ungrounded V delta somewhere, but not common like the V 3phase 4 wire center tapped delta.
Many power companies are replacing these as transmission lines are upgraded and all 3 phases are available for a wye transformer bank. Our REA power company recently upgraded the line adding the 3rd phase, but they just moved all the residential and single phase on to the new phase.
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