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Old 02-28-2015, 10:35 AM   #1
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Default Compressor meant for Delta

This one job had a 480v 3 phase compressor. There was a 600v to 480v delta Wye Transformer for it, fused properly, but the compressor says it needs Delta coming in. It doesn't need a neutral from the Wye. But why would it matter if it was fed from a Delta/Delta or a Delta/Wye on the secondary?
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Old 02-28-2015, 12:27 PM   #2
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It's kind of a misnomer to say it "needs" a delta power system coming in, what they likely meant is that it ONLY needs the 3 phases, it is not using the neutral, so you don't need to run it out to the compressor. The compressor motor doesn't know, or care, what the line to ground reference voltage is going to be, it only needs the 3 lines going to it to be 480V line to line. So the feed to it could be Wye or Delta, doesn't matter.

But as to the TRANSFORMER, you still have to CONNECT the X0 terminal of that Wye secondary to ground or you can burn up the transformer. You just don't need to run a neutral conductor anywhere else.
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Old 02-28-2015, 01:26 PM   #3
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JRaef: I know the conditions it can create not bonding the secondary center tap in this setting, but I didn't know it could cause the XFMR to fail. Could you explain a little on what could happen that would make it burn?
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Old 02-28-2015, 04:58 PM   #4
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I grounded the XO, obviously didn't connect it to the compressor. The guy said it wouldn't run properly on the Wye. These guys know their stuff, or at least it sounds like it most of the time. But I didn't understand his remark about the whole Delta thing, I'm sure someone with more knowledge then me can chime in. To my understanding the compressor wouldn't know if it's Wye or Delta coming into it, only that it's the right voltage coming in.
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