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  1. crshears

    clogged suction or discharge pump linr

    OP: more information yields better answers!
  2. crshears

    Problem in substation DC system

    Likely an inadvertent parallel between systems 1 and 2, causing the two chargers to fight each other; one way to track down where the tie path is is by the sectionalizing method. If memory serves, the way forward is to create a switching and checking sequence that progresses through all...
  3. crshears

    Inrush current of transformer

    Yeah, saw traces several times over the course of my career. My utility's practice predominantly favoured placing transformers on potential using high side disconnect switches designed for the purpose; the charging currents tended to be mitigated by the resistance in air of the arcs when they...
  4. crshears

    Inrush current of transformer

    Ah, that's what you meant; difference of terminology, I guess. I picked up many an interrupted feeder over the course of my career, but it was never part of our jargon, ever, to refer to feeder cold load pick-up current as supplied by a trafo's secondary windings as any kind of "inrush;" that...
  5. crshears

    Inrush current of transformer

    Um . . . what am I missing? Typo? I was referring to the "conventional" configuration in my response, and specifically intended to say "placing on potential with the secondary [ LT ] breaker, and loading on the HT side by some appropriate means." I have also seen GSU Txs direct connected to...
  6. crshears

    Inrush current of transformer

    Not unless you're energizing from the low tension side, then loading on the high tension side . . . which I've seen done as a routine practice often enough to not flat-out dismiss the possibility.
  7. crshears

    Minimum requirements mechanical testing of SA105 forgings

    Possibly, but only if you post your query in the correct forum; this isn't it. Please re-post in an appropriate forum for your topic and delete this one.
  8. crshears

    Emergency Generator

    Most AsHJ don't want to see parallels with shore at all; they more or less ubiquitously stipulate break before make, in both directions. That being said, though, with a demonstrable need for make before break and appropriate measures and precautions, parallels with shore may be permitted, but...
  9. crshears

    Tie Breaker in Series and Bus duct

    And to think I was thinking 13.8 kV . . .
  10. crshears

    Emergency Generator

    I figured Bill would describe it better than I ever could, and I was right. The only codicil I might add would be to suggest having a zero load speed of 50.75 / 60.9 Hz on all units, such that the frequency will be at nominal when system load is 50% with all units loaded at 50%. That way...
  11. crshears

    Tie Breaker in Series and Bus duct

    Using two breakers in series provides additional redundancy in terms of being able to still break bus parallel if one bus tie breaker should fail to open on command during switching. Breaker fail schemes also benefit from having a second breaker. However, providing two breakers in series...
  12. crshears

    GD&T

    Not the right forum for your question; please re-post in an appropriate forum and delete this post
  13. crshears

    Maximum transformer rating/circuit breakers in parallel configuration - 2nd round

    And, just me being picky, it's SF6, not SF6.
  14. crshears

    Question About Escape of Pressurized Hot Water

    Good thinking about the isolated line having a heat content that will cause flashing for some time; I hadn't gone there. Thanks all.
  15. crshears

    Question About Escape of Pressurized Hot Water

    This I definitely don't get . . . If the system is sufficiently pressurized to preclude any flashing at any point, the fluid flowing will be a single phase liquid mixture with identical therrmodynamic properties throughout its entire cross-sectional area, no? And if this is in fact so, the...
  16. crshears

    Question About Escape of Pressurized Hot Water

    Hey all, I was recently told something that doesn't square with what I've come to believe about steam flashing; hopefully you can tell me if I'm way off base . . . My brother in law related how back in the day he worked at a very large greenhouse and flower growing facility that used...
  17. crshears

    To replace faulty power alternator with a smaller unit

    Operational and thermodynamic analysis would answer that one; I recall working with an operating engineer who would lower the boiler pressure set point when at reduced / minimum load overnight, instead of just throttling down. Interestingly [ at least to me! ], for the six plus years I worked...
  18. crshears

    Get the required proprties from the property window from the bundle segment in catia v5 using vba

    I could help if I understood what you're talking about . . . but I don't, plus I am not doing your work for you. I suggest you peruse the list of forums and find the one which best covers your topic of interest.
  19. crshears

    [Active Front End Rectifier] Leading current issues

    Welcome to the forums, burnttoast.
  20. crshears

    Get the required proprties from the property window from the bundle segment in catia v5 using vba

    wrong forum for your question - please re-post correctly and delete this one

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