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  1. blacklabs

    Circuit breaker rating

    A Westinghouse VCP-W 250 1200A 4.16KV breaker has a SC rating of 29kA and a C&L rating of 58kA. What does C&L refer to? Thanks for any assistance. Merry Christmas!!
  2. blacklabs

    Transformer Oil Power Factor

    Thanks to all.
  3. blacklabs

    Transformer Oil Power Factor

    Can someone explain the meaning of "Transformer Oil Power Factor". An analysis of our transformer oil indicated a sudden change in Power Factor that gradually began to recover. When we refer to PF, we refer to the relationship of real and reactive power. How does it equate with oil analysis...
  4. blacklabs

    7FA Lift OIl

    Appreciate any input. At what point does lift oil solenoid 20QB-1 open and close? Thanks
  5. blacklabs

    Line Charging Susceptance

    You have been extremely helpful.One more question. In the first formula,is that "in" for inches? Thanks
  6. blacklabs

    Line Charging Susceptance

    In the Susceptance formula, what does the "f" represent? Thanks
  7. blacklabs

    Line Charging Susceptance

    I have to come up with a bunch of data for the System Operator. We've managed to pull most of the data together except for the "Line Charging Susceptance" of an underground cable. I'm not an Electrical Engineer so any help on how I can come up with this will be greatly appreciated. I've checked...
  8. blacklabs

    Sequence for restoring section of bus

    For the sake of argument, a section of bus is removed from service. Breakers are opened, disconnect switches are open and associated ground switches are closed. When restoring this bus, i feel ground switches should be opened followed by the closure of the disconnect switches.Is there a standard...
  9. blacklabs

    Glycol concentration and heat transfer

    Thanks to all for the help!
  10. blacklabs

    Glycol concentration and heat transfer

    Freeze protection for sections that may be isolated during maintenance. Thanks
  11. blacklabs

    Glycol concentration and heat transfer

    In a closed loop cooling system designed to run at 50% Glycol/50% Water, the concentration has dropped to 30% glycol. How will this affect heat transfer capabilities. The temperature range for this fluid is approx. 60 - 120 degF.
  12. blacklabs

    Power Transformers

    160000/213000/266000 OA FA FA
  13. blacklabs

    Power Transformers

    I'm not an electrical engineer, but some one who has been given the task of finding this data based upon what appears on the name plate. Thanks anyway!
  14. blacklabs

    Power Transformers

    How does one calculate the Emergency Rating (MVA) of a power transformer?
  15. blacklabs

    Phase Angle Regulator

    Thank You
  16. blacklabs

    Phase Angle Regulator

    Typically, can power flow both ways through a phase angle regulator?
  17. blacklabs

    Base Load

    Outstanding! Thank you all.
  18. blacklabs

    Base Load

    What is base load? How does one determine the base load for a gas turbine?
  19. blacklabs

    Variable frequency transformer

    It allows the transfer of power between grids. As far as i know there are two in existance, one in Quebec and one in Texas. I believe they are also building one in NJ.It's described as a "continuously variable phase shifting transformer that can operate at an adjustable phase angle"
  20. blacklabs

    Variable frequency transformer

    Anyone know of a good source for generalized information on "Variable Frequency Transformers"?
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