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  • Users: rhatcher
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  1. rhatcher

    Liquid Ring Compressor Torque Questions

    I am interested in the torque characteristics of a liquid ring compressor for the purpose of specifying a driving motor. My questions are: - Is the speed torque characteristic (starting torque) constant torque or variable torque? - Is the duty cycle (running torque) constant or variable? By...
  2. rhatcher

    liquid ring compressor torque questions

    I am interested in the torque characteristics of a liquid ring compressor for the purpose of specifying a driving motor. My questions are: - Is the speed torque characteristic (starting torque) constant torque or variable torque? I am under the impression that it may be constant torque. - Is...
  3. rhatcher

    GE Series One PLC Programming

    Hi, We have a machine equipped with a GE Series One PLC. The CPU failed and the program was not retrievable. I have the ladder logic and have written the Boolean/keystroke version of the program to be keyed into the programming module in order to load the logic into the PLC. I am not sure...
  4. rhatcher

    Testing GE Versa Trip with Ground Fault

    Does anyone have the procedure for high current testing a GE Versa Trip overcurrent trip device when equipped with 4-wire ground fault (external neutral CT)? A copy of the instruction manual would be even better. By the way, this is not a MicroVersatrip or RMS-9 MicroVersaTrip, this is the...
  5. rhatcher

    generator excitation versus load

    Is it possible to determine the full load excitation requirement for a low voltage synchronous generator bsaed on the no load readings?
  6. rhatcher

    Transformer Power Factorr Test

    I am going to be perfoming some maintenance and testing on 9 single phase, low voltage transformers set up as 3, three phase banks. The transformers are dry type, 450V-120V, 250kva. Among the specifications is the requirement to perform power factor testing. My experience with transformer...
  7. rhatcher

    Open Delta - Open Wye Fault Question

    I am looking at a system fed by an open-wye/open-delta transformer pair. The primary is 14.4kV and the secondary is 240V, three phase, four wire with a grounded neutral connected to a center tap on one transformer. The nominal single phase voltages are high leg 120V/120V/190V. The loads are...
  8. rhatcher

    Pump Curve Question

    Can anyone tell me what the triangles on the attached pump curve represent? I am thinking that they represent the 'design requirements' for the application that the pump is being tested for. The application in this case is a dry dock located on a tidal river.
  9. rhatcher

    A new name for this forum?

    A star each for Edison123, ScottyUk, and rmw for inspiring a new and more appropriate name for this forum. I just noticed the change today. Of course, sometimes I am a little slow. If this happened before today or I am somehow clueless, please just pat me on the head and accept me as the...
  10. rhatcher

    hammer mill - constant torque or variable torque?

    I am considering a motor redesign to change the speed of a hammer mill that is used to shred steel. Does a hammer mill respond like a variable torque load or a constant torque load? If we change the speed, does the power change proportionally or as a square or cube? Thanks
  11. rhatcher

    Power Factor Correction, Leading Power Factor, and a few other concern

    I want to install power factor correction at my facility. I have a single 13.8kV feeder with utility meter feeding 7 substations with various low voltage secondaries. I would like to install one capacitor bank on the secondary of one the the substations to compensate for the entire facility. I...
  12. rhatcher

    Finding transformer magnetizing kVARs?

    Can anyone tell me how to determine the magnetizing kVARs for a transformer? Is there a general value that can be used for estimating purposes based on kVA capacity? The known values of the transformers in question are primary and secondary voltage, rated kVA, and percent impedance. In order...

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