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Recent content by mparenteau

  1. mparenteau

    UPS Load Test

    It's more typical to use resistive load banks. I suppose you could use a reactive load bank...I personally have never seen it done. Mike
  2. mparenteau

    Areas of New Jersey that still use ungrounded delta?

    perhaps this will help: https://www.eng-tips.com/threads/california-utilities-preference-for-ungrounded-distribution.475516/ Mike
  3. mparenteau

    VFD increasing the motor winding temperature

    Distance from drive to motor? Is the motor inverter duty rated? Mike
  4. mparenteau

    new ATS and now one downstream Breaker tripping

    Sounds like an inrush trip. Is your breaker feeding the transformer set properly? Mike
  5. mparenteau

    Gas group IIA vs IIB, IIC

    You'll have to do your due diligence and check the frame sizes with the corresponding motor group. Also, be careful with AIT and any VFD applications as it pertains to motor inverter duty capability. Mike PS for example, you may have a motor spec that gives a T3C temperature code for a sine...
  6. mparenteau

    Tie Breaker in Series and Bus duct

    Not sure about your voltage...maybe a tie-breaker in your busduct link? Mike
  7. mparenteau

    Reactance and Time constant tests for a generator

    Programs like SKM, ETAP, etc.
  8. mparenteau

    Reactance and Time constant tests for a generator

    That information certainly helps to model your capability curve. Mike
  9. mparenteau

    What is positive to negative sequence coupling and negative to positive sequence coupling ?

    Mutual coupling... Mike
  10. mparenteau

    Analysis for determining location of arrestors on overhead distribution lines

    Maybe this will help: IEEE Std C62.22TM-2009 Mike PS Found this paper as well: https://www.sciencedirect.com/science/article/pii/S0378779621005642#:~:text=Line%20surge%20arresters%20are%20installed,to%20a%20poor%20soil%20conductivity.
  11. mparenteau

    Arc Flash in SKM

    Assuming you have a MV or HV circuit breaker w/ no "brains", the relay is the brains. So, there will be a slight delay between relay sensing, and the relay issuing a trip command. So it would actually be longer than 2 sec, unless you included the opening time of the breaker. Mike
  12. mparenteau

    MV Switchgear Fuse

    Who knows? Did you look at how the fuse performs at 12x @ .1 sec and 20x @ .01 sec (I have seen 25x @ .01 sec as well)? Mike
  13. mparenteau

    Single VFD running two motors - One motor temperature much hotter.

    An ID run is a procedure whereby the VFD "learns" the motor(s) characteristics via an algorithm. I'll defer to jraef on the rest... Mike
  14. mparenteau

    Running a DOL starter from a VFD

    There are usually interlocks between a VFD, load side disconnect and the VFD itself (I've never used a starter on the load side of a VFD, but have installed disconnects on the load side of a VFD for local isolation). Drives don't like switching actions on the load side of their terminals while a...
  15. mparenteau

    Eutectic Alloy vs E100 Solid State Overload

    Solid state OLs will give you some flexibility on setting based on FLA. Some have phase loss settings for motor protection as well. Mike
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