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Recent content by mmuel

  1. mmuel

    Reading manufactures time current curves

    Thanks for all of the replies. I was able to have a colleague try different settings using SKM software and apparently the short time setting makes no difference using a flat short slope with the instantaneous turned on.
  2. mmuel

    Reading manufactures time current curves

    Hello, I am trying to decipher an Eaton/Cutler-Hammer TCC. The drawing number is 70C1034 and it is for a Digitrip 1150 trip unit. The problem I have is a heater shorted out and instead of tripping the 30A MCCB in the unit or the 50A panel MCCB, it tripped the 800A distribution LVPCB. It...
  3. mmuel

    OEL and generator capability curve don't seem to match

    The AVR is in the Power factor mode. I’m not sure if that is the correct terminology but when the operator sets the VARS at a set point, it will hold that VAR set point. I am trying to also figure out how to do the math from the other gages (PF, Amps, and Voltage) to check if the VAR meter is at...
  4. mmuel

    OEL and generator capability curve don't seem to match

    Hello Gentlemen, We have a 50MW gas turbine that is used for peaking and system stability. The problem we are experiencing is when we are exporting VARS (over exciting the generator) we hit the volt/hertz limit (1.05pu) before the generator capability curve indicates we should. Here are the...

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