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  1. doehl1

    Fluctuation of MW on 2 turbo-alternators

    We've had units that were at or near a temperature or pressure limit(er) and a faulty sensor, thermocouple, etc was causing the PID control and subsequently the fuel valve to start hunting.
  2. doehl1

    HRG & Capacitive Charging Current

    Our 13.8kV, 30MVA generator has a neutral HRG (single phase transformer w/ resistor on secondary) that is designed to allow 5A (primary) on the generator neutral during the first phase-ground fault. Our end user on a new install is advising that their system has a nominal continuous value of...
  3. doehl1

    Convert a 0-200 Microamp Signal for use in PLC?

    Accuracy isn't too critical. 0.5% - 1.0% or better preferred. The 0-200 microamp signal is just for monitoring, not precise control.
  4. doehl1

    Convert a 0-200 Microamp Signal for use in PLC?

    I have an old turbine control system that uses black boxes for temperature and speed control. I'm trying to get the speed (passive Mag pick-up) and temperature signals (Type K Thermocouple) in to a PLC for monitoring. I think piggy backing off the Mag pick and taking the signal into a high...
  5. doehl1

    4160V EM Bemac II Synch Generator

    I am looking for a direct replacement of an older EM Bemac II synchronous generator. Anyone know where I might find such an animal, aside from OEM: 4160V, Wye-connected 750-800kW 60Hz, 1800rpm Frame 732 Two-bearing Thank you in advance...
  6. doehl1

    Neutral Bar Clearance, 13.8kV Generator

    Correction, T4, T5 & T6 for neutral connection leads from generator stator.
  7. doehl1

    Neutral Bar Clearance, 13.8kV Generator

    Anyone know what the clearance requirements are for a 15kV (13.8kV nom) generator neutral bar? This is the neutral bar within the generator terminal box and would typically have leads T2, T4, T6 landed on it. Is there any code requirement or industry standard I could refer to? Live phase...
  8. doehl1

    3 x Single Phase OR 1 x 3-phase Power Transformer

    I have the opportunity to install qty (3) 333kVA single phase transformers (pole-mount, oil filled) or qty (1) 1000kVA 3-phase transformer (pad-mount, oil filled). Not considering any other factors (installation, space, etc.) which set up would be most electrically efficient at full load? Is...
  9. doehl1

    Unusual Generator to GSU Transformer Configuration

    I've inherited a project with an existing standby generator, 2.5MW, 480V, wye connected which feeds an existing 480/11kV Wye-Delta GSU transformer. In this case the wye connected generator is connected to the wye windings on the primary of the transformer. Wye's are solidly grounded. Service...
  10. doehl1

    LMS100, How Dear?

    Anybody have an idea what the current cost is for a GE LMS100PA genset package is? Just looking for an idea of the package, and GE-supplied auxiliaries, not necessarily install or other EPC costs. David www.mavenpower.com
  11. doehl1

    Wierd Curiosity for RSLogix Security Login

    Prior to the login requirement, there's a message that states, "The current security connection is no longer valid". David www.mavenpower.com
  12. doehl1

    Wierd Curiosity for RSLogix Security Login

    I have RSLogix500 running for months on my PC and now I get an error message and it's asking me for Security Login username and password. Never had to do this before. Strange thing is, I can see my proper activation in the Factory Talk Activation Manager. I have no idea what this username...
  13. doehl1

    Sales Gas Spec for Saudi Arabia

    Anyone with experience working the natural gas plants in Saudi Arabia? I need to know the sales gas composition/specs for natural gas supplied to their power plants. Thank you David www.mavenpower.com
  14. doehl1

    Motor-Generator vs. VFD?

    Well formulated Scotty. Thanks. Had forgotten about the limited interrupting ability of these VFDs... David www.mavenpower.com
  15. doehl1

    Motor-Generator vs. VFD?

    I have an application where my existing power control room runs about 250kVA of load at 480V, 3P3W, 60Hz. This PCR will be shipped to a 400V, 50Hz country. My initial solution was to use a motor-generator set (50Hz motor turning a 60Hz Generator) due to its simplicity, few parts, and pure...
  16. doehl1

    Inrush Current for Multiple Power Transformers in Series?

    I have an application where a generating station is providing power to a regional load via two power transformers. Generation is at 400V, steps to 24kV at Trafo1, and then 600m later steps down to 400V at Trafo2. Both transformers are 2000kVA w/ impedance of 6.43%. Assuming no cold load...
  17. doehl1

    Allen Bradley PanelView Component? Yeah or Nay?

    I have a small automation project we're working on which will use an AB Micrologix1200 processor. I need a low cost HMI and am considering the AB PanelView Component family, which I have never used before. I know there were some serious issues with programming speed/latency, validation, etc...
  18. doehl1

    Inverse of a VFD

    Spar, yes this is similar to a wind power application (actually tidal power), but on a small scale, and running in island mode (no grid tie). I am looking for a converter of this "wild" AC power to a constant frequency supply. What would you suggest for the lack of utility reactive power...
  19. doehl1

    Inverse of a VFD

    I have an application in which an induction motor (island mode w/ capacitors for reactive power) supplies a variable rotational speed/frequency input and I need a constant speed/frequency output. In other words, I have an input, single phase voltage signal which will vary from 0-60Hz, and I...
  20. doehl1

    Dedicated Controller Supplier

    Unfortunately, gas station metering has nothing to do with my application. The fuel is not even gasoline. I intentionally kept the functional specification generic to get a more comprehensive response. David www.mavenpower.com

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