The efficiency of a transformer is given by,
Now, input = output + losses = V2 I2 cos Φ + losses
Using in (1), η = 1 - (losses / (V2 I2 cos Φ + losses))
Let losses/V2 I2 = x and using in (2),
Thus as the power factor of the load is more i.e. cos is higher, x/cosΦ is lesser. Hence the second term in the equation (3) becomes lesser and efficiency will be more.
Key Point : As power factor increases, the efficiency increases.
Thus the family of efficiency curves are obtained as power factor increases, as shown in the Fig.1.
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| Fig. 1 Effect of p.f. on efficiency |
please send equivalent circuit diagram of three transformer,autotransformer notes
ReplyDeletePlease send me the notes on equivalent circuit of three phase transformer and auto transformer notes.
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