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  1. xfmrexpert

    Transformer Test Report Missing data for PTLoad Heatruns

    If it is a transformer with thermally upgraded insulation, but the heat run was done at 55C, just check "55C rise insulation" for the insulation system. Enter the heat run data on the next "Cooling" tab for the 55C rating. Be sure to enter the 55C rating for "Test Load". Also, don't use the...
  2. xfmrexpert

    Transformer Time Constant

    Thermal? If so, oil-immersed or dry-type?
  3. xfmrexpert

    Residential Foundations

    Without a geotech report, how do I know if the soil has any significant amounts of clays or silts? Or more importantly, how did the builder know... Is it typical to design for the worst case condition of clay?
  4. xfmrexpert

    Residential Foundations

    I am buying some new construction up in Saratoga, NY. I'm an electric power engineer, so this is a bit out of my depth. The foundation is 8' with 6' backfill, 8" thick. I'm told the vertical reinforcement is #4 at 48"oc (although this isn't on the drawings). The IRC (and New York State...
  5. xfmrexpert

    adding new oil to transformer

    Yes, provided it meets the requirements for new silicone fluids in table 2 of C57.111. Just be careful not to mix silicone with mineral oil, or use any equipment for filling that was previously used with mineral oil. It will foam like an SOB.
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