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  1. eobryan

    Delta to Wye Problem

    The power requirements are as follows: 3NPE 400/230 V +/- 10%, 50/60 Hz; 8 kVA 16 A time-delay fuses After considering all of your helpful input, I’ve decided to purchase a 9 kVA 1:1 delta-to-wye transformer which I will attach to the side of my existing floor standing autotransformer. I will...
  2. eobryan

    Delta to Wye Problem

    Correction, my autotransformer has an appropiate tap ( 0.48 ratio ). So my original question still stands -- can I safely use the autotransformer?
  3. eobryan

    Delta to Wye Problem

    As requested, I have posted a wiring diagram and I'm glad I did as I find that I need 400 Volts instead of 277 (I mistakenly thought my x-ray system would adapt to anything between 400 and 230). Therefore, my question to all of you has changed since my autotransformer is useless. Given that I...
  4. eobryan

    Delta to Wye Problem

    I understand that the line-line on a wye is the square root of 3 times the line-neutral. What I have for a source is a fused safety switch box on the wall of a laboratory. There are four wires in that box, the biggest of which is the safety ground. This box is about 30 meters from the...
  5. eobryan

    Delta to Wye Problem

    I need to reduce the voltage from 480 to 277. I can't get this directly from the delta service. Therefore, I need something to reduce the voltage. I'm concerned that using the autotransformer will violate some codes because the delta service has no fixed ground. If I use the autotransformer I...
  6. eobryan

    Delta to Wye Problem

    I need to power a x-ray generator from a 480 delta service. The generator needs 277 wye. I happen to have a 3-phase autotransformer with the proper taps. Can I use the autotransformer with the center tied to safety ground; or, should I buy a delta-to-wye transformer and connect the neutral of...

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