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  • Users: turkoman
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  1. turkoman

    about v/f control

    hi chaps. i want to ask you about the role of the air-gap flux in the motors with regard to v/f control, everywhere it is written that v/f is kept constant to keep the magnetizing current constant, but why??? what is the relation between flux and torque? I also wonder the air-gap flux and...
  2. turkoman

    PFC

    hello, where do we need to connect the current transformer on pfc installations which gives the current knowledge to the reactive power relay ,in fornt of the power transformers or to the load side of it? ? am asking it because i cant guess the role of the reactvie power due to the magnetization...
  3. turkoman

    of generator cos phi

    hi, i wonder if we have plate cos phi value of 0,8 does it mean that a 1000 kVA generator will give nominally 800 kwatt? is there any drawback if we operate this generator with a load of 1000 kwatt? ?f we could do it, so why do we have cos phi = 0,8 values on generators ups's etc...greetings..
  4. turkoman

    about hydroelectrical power stations

    pls tell me about these parts on turbine and generator 1- pedestal bearing 2-guide bearing 3- thrust bearing
  5. turkoman

    single phase operation on 3 phase transformer

    could you tell me pls if I use one phase of a three phase transformer and the other two is no loaded and wye point is earthed well what is the voltage levels of the phases in general, or does it has drawbacks on the transformer?
  6. turkoman

    dielectrics..

    as far as ? know the vacuum is a better dielectric than air but when we look at the material properties chart of them we see that dielectric constant is higher for air. so am i wrong when i think that vacuum is the best dielectric of all materials but as coefficient it has 1 and air is 1,006...
  7. turkoman

    diversity rule for transformer rating

    pls tell me if for example i have 200 house each has a 10 kwatt consumer if all the receptacles and lightings. so i will calculate a transformer rating for this premise site.what is the correct approach here .SHALL I apply a diversity for calculating transformer kva or not.... As far as I...
  8. turkoman

    about transformers humming

    pls tell me if there is a difference between dry and oil type transformers in sight of transformer humming and is it true that as the load increases the humming decreases and if dry type is worse than oil type with regard to this point. Also i wonder if there is a relation between harmonics...
  9. turkoman

    about diesel-generator voltage control

    hello, ? wanna ask you about the relation between diesel-generator automatic voltage control and compensation, for example we have a d.g and a mains and we feed the loads from mains and cos fi= 0,75 and we have no compensation system, at that point the mains is gone and we transfer the power...
  10. turkoman

    about ?SOLATED power systems

    hello, I wonder if we must bond ?SOLATED Power system common earth bus to the main grounding busbar of a hospital or just earth this common IT EARTH bus to directly? which one is true. can u explain for me the final stage of earthing of the IT systems....

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