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

 

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

 

Originally posted by haditya@Jul 24 2005, 01:35 AM
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

[post=9235]Quoted post[/post]​

 

Originally posted by Kgaidzanwa@Jul 25 2005, 02:10 AM

[post=9245]Quoted post[/post]​

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