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  1. PowerOut

    Generator Excitation Power

    Great answers: -No restrictions (availability of diodes carrying high currents... or ...space for fixing multiple parallel diodes in a rotor) for DC generator or static excitation, and -Faster response with static, less maintenance with brushless The comment: "you would no longer see the 900kW...
  2. PowerOut

    Generator Excitation Power

    Thanks for the insight gents, 3 out of 4 ain't bad. GE Frame 7E's and smaller use brushless excitation, whereas larger F technologies and above don't, at a 9FA (~270 MW) site in Abu Dhabi, over 900 kW parasitic load was pulled off upstream of the guarantee test power output meter location for...
  3. PowerOut

    Generator Excitation Power

    Excitation power (kW) on some generators can be calculated as the product of field voltage and current divided by an assumed factor for AC to DC conversion element losses and 1000 W/kW, and sometimes amounts to several hundred kW. When the generator in question contains a brushless excitation...
  4. PowerOut

    Capacitor Diagnostics Fun

    The motor turns over, then actually trips the breaker on the main house panel! This happens whenever the motor tries to start with pressure in the tank. I'm going with the faulty unloading (dump) valve suggested by stevenal (thanks stevenal - I think you nailed the solution). The motor will...
  5. PowerOut

    Capacitor Diagnostics Fun

    My air compressor starts and charges the tank, but when pressure drops below the lower limit set point the motor will not start a second time until tank pressure decays sufficiently. The air compressor manufacturer suggests either the motor starting or running capacitor may be faulty. Both...
  6. PowerOut

    KWH FOR A 3-PHASE MOTOR

    Yeah, I just picked up one of these clamp-on jewels from Harbor Freight for under $20, manufactured by Cen Tec, good three digit resolution too. Let me re-phrase, under what circumstances would the square root of (the sum of the squares) / 3 input to the power calculation apply?
  7. PowerOut

    KWH FOR A 3-PHASE MOTOR

    Suppose volts, amps, and power factor are measured on each phase. Is the average of each parameter input to the power calculation? The reason asked is because another thread indicated current should be input to the power calculation as the square root of (the sum of the three currents squared)...

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