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  1. madisonbadgers

    600V oscilloscopes

    yes thanks I appreciate that the isolation from grnd and each other so I can do phase to neutral and then overlay phase to phase without the becoming a short.
  2. madisonbadgers

    600V oscilloscopes

    hello we have an algient 3000 scope and it only takes 300V rms. any suggestions for a 4 channel scope that I can use on 480V circuits. Maybe something that can compute THD% and have current probes for displacement power factor and total power factor? any suggestions are apprecaited. thank you...
  3. madisonbadgers

    Delta Wye Dyn1 not Dyn11

    In response to some of the above, we are doing a project where the transformer is coming from croatia. It has 4 delta windings at 3160 and a single wye winding that is connecting to the 13.8KV grid. The 4 windings are connected to 4 inverters paralleled to improve performance. The unit is coming...
  4. madisonbadgers

    Delta Wye Dyn1 not Dyn11

    To Davidbeach's point, I think that is what I am trying to understand. Exactly how to I rearrange the wires (rools and swaps) to achieve different phase relationships. I find myself in front of a transformer with the client and the EC asking me exactly which wire goes where. I cant just say well...
  5. madisonbadgers

    Delta Wye Dyn1 not Dyn11

    do real transformers exibit a deviation from the perfect 30° shift. For example if I measure a transformer in service would I see 29.8° due to the realities of a real machine vs the theoretical? or would it be 30.2? I am asking because if I parallel 2 transformers and there was a slight...
  6. madisonbadgers

    Delta Wye Dyn1 not Dyn11

    has anyone tried to make transformers in LTSpice using ideal inductors and spice directives to define the coupling? I found a tutorial on this but I was having some trouble. It errored saying that the nodes were floating, but I dont want to ground the delta. Thanks...
  7. madisonbadgers

    Delta Wye Dyn1 not Dyn11

    SO reading the link you gave I see page 13 seems to be the trick. It looks like the dot connection on the delta primary is the difference unless I am missing it. Is there a free circuit simulation software that has transformer models? I would like to play with these connections and watch the...
  8. madisonbadgers

    Delta Wye Dyn1 not Dyn11

    I have been reading the following closed thread http://www.eng-tips.com/viewthread.cfm?qid=41454 And then I found this pdf below. http://www.labvolt.com/downloads/download/86379_F0.pdf as I understand this, the Delta Wye example shown on page 20 is a Dyn11 because the Secondary line to line...

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