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  • Users: Alex68
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  1. Alex68

    Photovoltaic power plants: inverter controls

    Dear all, sorry for the long post. During the design of two big photovoltaic power plants, the first one connected to the national HV grid and the second one isolated, manufacturers of inverters were not able to give some answers about the behaviour of their devices in steady state conditions...
  2. Alex68

    Vector of an old transformer

    Dear Collegues, I'm dealing with an old transformer, dated 1970, whose ratio is 10 / 0.4 kV. The vector group is indicated as ynD11. This is new for me. Is it equal to Dyn11? What is the connection of the primary winding: yn or D? Thank you for you help. Cheers Alex
  3. Alex68

    Tap Changer and C37-13

    Dear all, this is my first time using ANSI C37-13 to calculate short circuit currents at generator terminals. I reading the std, the example of the annex A in particular, I noted that the calculation procedure does not consider the possibility that the tap changer of the step up transformer is...
  4. Alex68

    Active filter and cable sizing

    Dear Collegues, I must size the cable of an active filter. This cable has to carry a little 50 Hz harmonic but lots of harmonics in the range 150 Hz to 2.5 kHz. So I can't apply the usual sizing criteria based on the fondamental harmonic and the de-rating factors as indicated in the Red Book...
  5. Alex68

    6 MVA generator data

    Dear collegues, I must do some preliminary calculations and I'm looking for typical data of a synchronous generator: A = 6 MVA Vr = 11 kV f = 50 Hz pf = 0.8 4 poles Could anybody provide me some indication about resistance and reactances? Thank you very much. Alex
  6. Alex68

    Data of EGT Typhoon generator

    Dear users, I'm looking for data about the 4.9 MW Typhoon gas turbine gen set of EGT. The 6 MVA synchro generator was made by Alstom. Regarding the Gas Turbine, I need data about the inertia and the governor. Regarding the generator, I need the capability curvem the inertia, all the electrical...
  7. Alex68

    Torsional stress of synchr generator

    Dear all, I have already posted this question to our mechanical collegues but no answer arrived. I'm trying to understand which the torsional limit of a synchronous generator is. I have got the "lateral and torsional vibrations study" of the rotating shaft of a gas turbine + generator system...
  8. Alex68

    Torsional limit of generator shaft

    Dear all, I'm an electrical engineer but I'm trying to understand which the torsional limit of a synchronous generator is. I have got the "lateral and torsional vibrations study" of the rotating shaft of a gas turbine + generator system (250MW). In the discussion of results I can read that...
  9. Alex68

    Diesel generator and transformer inrush

    A client of mine asked me to make a list of the requirements of a diesel generator which must be able to withstand the inrush of one transformer. Generator data: Rated voltage: 6.6 kV Rated Freq: 60Hz Rated power: 2.1 MW power factor: 0.8 Transformer: Vltg ratio: 6.6 / 0.45 kV Rated power: 1.6...
  10. Alex68

    Overhead line data

    Dear friends, I must carry out a study of lightning phenomena in a overhead line. I need to know the typical geometry of a 33kV OH line (50Hz - Saudi Arabia). In particular I need the distance of each conductor (sky wire included) from the ground and from the vertical axes of the pylon. Could...
  11. Alex68

    Models and motors in ATP

    Hi friends, is there anybody expert in ATP simulations? I am starting now and I have many difficulties but the manuals are not clear. I would like to simulate induction motors by UM3. Two problems: 1) Enabling the manual initialisation of UM, I must input some currents, but there is no...
  12. Alex68

    IEC 61363-1

    Dear Colleagues, for the first time I must carry out a short circuit calculation for an off-shore plant. Usually I base my calculations on the IEC 60909, but this is not applicable in this case, as clearly stated in the first chapter. I must apply the IEC 61363-1 but my software does not...
  13. Alex68

    Program for grounding analysis

    hi friends, I'm looking for a CHEAP but effective software for the grounding grid analysis. Could you suggest anything? On the other hand, I could write by myself the prg, if somebody could suggest the basic algorythm. Thank you Alex68
  14. Alex68

    Hi folks, I must calculate the cur

    Hi folks, I must calculate the current flowing through the earthing disconnector of the transformer HV side. This is the discharging current of the capacitances of the tansformer. Given data: 1- capacitance between HV winding and LV winding 2- capacitance between HV winding and ground 3-...
  15. Alex68

    harmonic filter manufatcurer

    Does anyone suggest me some european manufacturer of MV harmonic filters?

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