WYE source to a DELTA transformer primary?
WYE source to a DELTA transformer primary?
(OP)
A quick question on power transforming:
It appears that our building is supplied with 480 3-phase power in WYE form. That is, a four-wire system. We just moved into this building and are in the process of hooking up our power transformers to step down the power for 220 3-phase. But on close inspection we discovered that our transformer is a DELTA-WYE tranformer (DELTA Primary). If our power source is WYE, will there be a problem connecting to the DELTA primary of the transformer? What is done with the WYE-neutral? Is it a normal practice to leave this neutral unconnected?
It appears that our building is supplied with 480 3-phase power in WYE form. That is, a four-wire system. We just moved into this building and are in the process of hooking up our power transformers to step down the power for 220 3-phase. But on close inspection we discovered that our transformer is a DELTA-WYE tranformer (DELTA Primary). If our power source is WYE, will there be a problem connecting to the DELTA primary of the transformer? What is done with the WYE-neutral? Is it a normal practice to leave this neutral unconnected?






RE: WYE source to a DELTA transformer primary?
RE: WYE source to a DELTA transformer primary?
1. primary delta, secondary wye (grounded) - upstream transformer, e.g. 4.16kV-D/480V-Y
2. primary delta, secondary wye (grounded) - the first downstream transformer, e.g. 480V-D/220V-Y
3. primary delta, secondary wye (grounded) - the second downstream transformer, e.g. 220V-D/110V-Y
4. etc.
is considered the industry standard since it:
1. Breaks the zero sequence path
2. Solidly grounded wye establishes good system grounding
3. It is good for the secondary multivoltage system, e.g. 380Vphase-to-phase/220Vphase-to-neutral
4. Etc.
RE: WYE source to a DELTA transformer primary?
RE: WYE source to a DELTA transformer primary?