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Recent content by somacast

  1. somacast

    harmonic force , displacement, in a caesar ii dynamic analysis

    Hello and good day to you, I have a question about the harmonic force or displacement being used in an analysis and sorry for this being so basic question, but how is it determined if really things are quite hazy about the real source of vibration in the pipe, i.e. 2 phase or slug flow maybe...
  2. somacast

    The effect of transformers

    thanks again , I will go through it .
  3. somacast

    electrical motor power factor & efficiency

    noted, thanks again .... so for my readings provided here , I1 = 77A I2= 75 I3 = 77.7 A U = 10.8 KV P = 1.01 MW q= 1.01 MVAR how is power triangle gonna look like?
  4. somacast

    The effect of transformers

    noted, thank you very much, Last question, you refered to IEC in your replies, any specific volume/number covers the scope of such matter please? Thanks again
  5. somacast

    electrical motor power factor & efficiency

    for eff. @ 100% 94% @75% 93.5% power factor @100 its 73% @75 its 67% afaik that power factor drops badly if you are operating way below the rated point
  6. somacast

    electrical motor power factor & efficiency

    @waros : how did you get 1753 ? and regarding point 4 , this 11kv motor has its highest efficiency & pf at 100% load as per its datasheet !!
  7. somacast

    The effect of transformers

    thank you very much for all the informative replies @waros they are as we do have other 11kv motors @edison: so if 6.6 kv is more like better, then 11kv would be also an upgrade from 3.3kv in terms of saving ? can the difference be estimated? in terms of new pf or efficiency or so ? thnx
  8. somacast

    The effect of transformers

    Thank you very much for the information now in my case 3.3kv bus is there, however it comes through a transformer from the 11kv so i was thinking if in future replacement of motor if buying an 11kv to avoid the the transformer, will I have any benefits in terms of power savings, better power...
  9. somacast

    electrical motor power factor & efficiency

    sorry if I missed some information the motor rated power in the data sheet is 1200 kw so whats the efficiency here ?
  10. somacast

    The effect of transformers

    thank you very much for your replies. the 3.3kv motor is just less than 1000kw , and 11kv is about 1000 kw. the feeder is 11kv, anf the transformer to step down to 3.3kv (motor voltage). so is there a numerical way to calculate if the cost of energy is higher for which motor ? 11kv without...
  11. somacast

    electrical motor power factor & efficiency

    ok great , thanks so now what is the pf ? efficiency? thanks
  12. somacast

    The effect of transformers

    hi, I wanted to know please in comparison, when comparing 2 electrical fixed speed motors, of same power & rpm , but different voltages. in other words, is it more efficient to have a motor rated at 3300 volts via transformer from the 11000 volts feeder, or to have a 11kv motor directly ? i...
  13. somacast

    electrical motor power factor & efficiency

    Thank you all very much, as for @bacon4life questions the first post was what I read that day in electrical room through the feeder panel, the other numbers I mentioned 92A is the rated current at full load in the data sheet of the motor, as of the questions, i will try to answer: 1- here...
  14. somacast

    electrical motor power factor & efficiency

    hi, thanks for replying again the 76A measured when the motor shaft is 100% loaded, i.e. reading taken when machine @ 100 load.
  15. somacast

    electrical motor power factor & efficiency

    for instance as one of the confusions : datasheet says @100 load , the current is 92 Amps I read in electric room 76 Amps only ... quite weird to me ...
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