transformer question

Discussion in 'Homework Help' started by Kgaidzanwa, Jul 23, 2005.

  1. Kgaidzanwa

    Thread Starter New Member

    Jul 23, 2005
    3
    0
    A 100kva transformer has iron losses of 650 W and copper losses of 960 W when operating on full-load. Calculate the transformer efficiency when suppling
    1 50% full-load at 0.8 power factor
    2 25% full-load at 0.5 power factor
     
  2. haditya

    Senior Member

    Jan 19, 2004
    220
    0
    efficency can be calculated using the foll formula


    η = x.KVA.cos Φ /(x.KVA.cos Φ +x^2. Cu losses+Fe losses)

    x=current/full load current..
    =0.5 in the 1st case
    =0.25 in the 2nd case
    cos Φ =power factor
     
  3. Kgaidzanwa

    Thread Starter New Member

    Jul 23, 2005
    3
    0
     
  4. Kgaidzanwa

    Thread Starter New Member

    Jul 23, 2005
    3
    0
    Thanks for input but i am failing to substitute for x if you can show me your working it will help me understand the topic
     
Loading...