LTC for paralleled transformers
LTC for paralleled transformers
(OP)
Is a load-tap-changer (LTC) required for all paralleled transformers? If so, why? If not, what are the circumstances that one will not be required?
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LTC for paralleled transformers
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RE: LTC for paralleled transformers
You just need the effective turns ratios to be the same, regardless of how you get there.
But to equally share load, the two transformers need to have the same impedance.
David Castor
www.cvoes.com
RE: LTC for paralleled transformers
If one transformer of a paralleled set has an OLTC then the second transformer should have an OLTC slaved to the first OLTC. Different taps mean different turns ratio and that results in circulating currents.
Bill
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"Why not the best?"
Jimmy Carter
RE: LTC for paralleled transformers
RE: LTC for paralleled transformers
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: LTC for paralleled transformers
David Castor
www.cvoes.com
RE: LTC for paralleled transformers
RE: LTC for paralleled transformers
RE: LTC for paralleled transformers
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I did some control and wiring work on several transformers using the Beckwith controls last year, this paper provided some answers I couldn't get from the people I was working with, hope it helps you too.
Mike L.
RE: LTC for paralleled transformers
If the LTC is inactive and thus remains on the same tap all the time, then I wouldn't think that the second would need an LTC. However I would probably still opt for one.
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If it is broken, fix it. If it isn't broken, I'll soon fix that.
RE: LTC for paralleled transformers
No, it is not required. You could lock off the existing LTC and go unregulated. You could install (a) regulator(s) beyond the interconnection point (LTC still locked off). Or you could pair the new transformer with a regulator so the transformer regulator pair is paralleled with the LTC transformer. Matching impedances and ratios might be tricky for the last choice. I would opt for an LTC transformer closely matched in ratio, impedance, no of steps, and voltage per step.