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  • Users: nawao
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  1. nawao

    Failure in 1200 kW 6 kV motor

    To make an accurate diagnosis is necessary to see the rotor pictures
  2. nawao

    Loading generator without a load bank.

    Why not parallel to the grid? You can export as much Kw as you need to load test your units and not need to spend money in equipments that you will use only once.
  3. nawao

    tunning experiences of "droop" of a AVR.

    cloonypan, The droop function is used only when genset is paralleled. In island mode, the generator working alone, this function should be canceled (droop potentiometer fully counterclockwise), in order not to affect stability.
  4. nawao

    generator exciter system

    Is this happening when running in parallel with other generators in an islanded system?
  5. nawao

    Transformers Paralleling

    What about tap changer position?
  6. nawao

    Electric motor and Cavitation

    Submersible pumps must be protected to detect dry running and cavitation. There are adequate protection relays to do so. See the link below http://www.fanox.com/index.php?option=com_content&task=view&id=231&Itemid=363&lang=en
  7. nawao

    Blue Smoke upon Generator block load start

    Blue smoke could be also unburned fuel. Possibly wrong injection pump timing. Try to lightly advance the timing.
  8. nawao

    three phase to single reconnection

    Liam, You will get about 7.5 KVA. (M) is middle point. To be used only if there are 120V circuits to feed. In this case you can ground it. For 240V use the neutral will be one of the lines (L1) or (L2). Be careful to isolate the generator from the grid. Use a change over switch.
  9. nawao

    three phase to single reconnection

    liam 357, For single phase zigzag connect: 3 - 9 - (L1) 6 - 1 12 - 7 4 - 5 - 10 - 11 - (M) 2 - 8 - (L2) Voltage L1 - L2 : 240V Voltage L1 - M : 120V Voltage L2 - M : 120V
  10. nawao

    Question about non-automatic transfer switch

    Why not use a change over switch?
  11. nawao

    Generator.Random Current Fluctuations once Paralleled with the Grid

    electrouw As catserveng said: "You only load bank tested with a resistive load, so you did not qualify voltage droop, is the droop transformer in the generator (or switchboard, sometimes called the cross current transformer) installed with the correct polarity? Your inital description sounds...
  12. nawao

    diesel generator dies under load.. help

    Any maintenance work was done before this incident happen like cleaning of air filters? Check if any rag was sucked by the turbochargers Check water in the fuel
  13. nawao

    Paralleling

    Your droop setting is wrong. Try to adjust each set to 4% droop. To do so turn the droop pot fully counterclockwise, load individually each set and adjust droop pot to get 4% voltage droop at full load. You can make it proportionally, if you load the set at 50% adjust the pot at 2% voltage...
  14. nawao

    Paralleling of Dyn11 transfromer with Dz0 Transformer

    In the 2.5MVA 11kV/415V Dzn0 transformer, the LV phasor is in phase with the HV phasor while in the 2.5 MVA 6.6kV/415V, Dyn11 transformer the LV phasor leads by 30 degrees the HV phasor, so you cannot parallel both transformers.
  15. nawao

    60 Hz Generator at 50 Hz

    Cat sizes their generatrs differently between 60 and 50Hz. There are arrangmets with different radiators, fans and driving pulleys. Agreed thas is also a turbo question.
  16. nawao

    60 Hz Generator at 50 Hz

    You will have issues with water cooled engine (less water speed as well as air speed circulation). Possibly overheating will occur before reaching rated power.
  17. nawao

    deisel generator set trouble

    Few questions: 1)Are this generators operating only when the mains go off? 2)Are you paralleling them to the mains? 3)Or is it a complete islanded system (no mains at all)
  18. nawao

    400MW Generator pulling too many MVARS (lagging power factor)

    Invert the polarity of the droop CT and see how is the behaviour
  19. nawao

    excitation system for an old generator set

    You are upgrading the system from low resistance grounded to floating neutral: 1) You may have issues with your ground fault protection. 2) Voltage instability may difficult synchronisation
  20. nawao

    Synchronize Generators To Utility

    SyncCheck, You say: “I am in the design stage right now and looking at what would be the best way to achieve this... I am still looking at different controllers to do the job easier and use less of the PLC for control. I always design simple to operate systems that’s why I will disagree with...

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