Delta-wye to wye-delta reconfiguration?
Delta-wye to wye-delta reconfiguration?
(OP)
Good evening everyone.
I was hoping some of you may be able to help me with something. We have an excitation transformer that is in need of replacement. The existing transformer is a wye-delta 13.8kv to 630v. Somehow, the replacement was mistakenly ordered as a delta-wye. We have one group saying that they can just re-configure the windings to wye-delta, and it will work as intended. I'm not so sure that I agree. I've ran my own numbers and came up with a completely different secondary voltage. Is there something I am missing?
Thank you
I was hoping some of you may be able to help me with something. We have an excitation transformer that is in need of replacement. The existing transformer is a wye-delta 13.8kv to 630v. Somehow, the replacement was mistakenly ordered as a delta-wye. We have one group saying that they can just re-configure the windings to wye-delta, and it will work as intended. I'm not so sure that I agree. I've ran my own numbers and came up with a completely different secondary voltage. Is there something I am missing?
Thank you






RE: Delta-wye to wye-delta reconfiguration?
RE: Delta-wye to wye-delta reconfiguration?
RE: Delta-wye to wye-delta reconfiguration?
RE: Delta-wye to wye-delta reconfiguration?
RE: Delta-wye to wye-delta reconfiguration?
Prc, reconnecting the winding ends is exactly what's going on. It's a dry-type transformer and all winding ends are exposed, so it's not that difficult to reconfigure it, and that's what's going on right now.
ScottyUK, the generator's star point is connected to ground via a neutral grounding transformer and a large resistor bank. The excitation system is an old toshiba static excitation system. This transformer feeds the rectifier bridge. the existing one is wye-delta. There is also a 13.8kv/115v sync transformer that feeds the AVR and provides the waveforms the firing pulses are synchronized to. I'm not sure how much more detail you would like, but just ask :)
RE: Delta-wye to wye-delta reconfiguration?
If the original secondary was delta, you have no need of a secondary wye point. Just ignore it.
The rectifiers probably don't care what vector group they are fed from.
Bill
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"Why not the best?"
Jimmy Carter
RE: Delta-wye to wye-delta reconfiguration?
RE: Delta-wye to wye-delta reconfiguration?
RE: Delta-wye to wye-delta reconfiguration?
Curious: was the Yd transformer neutral point left floating on the original design?