transformer efficiency

[babyG]

I have a transformer thats 50MVA
It has a combined load+noload loss of 250kW

Does this give me (a roughly estimated) transformer with an efficiency of 99.5%? - ignore hysteresis etc...

Another engineer says its got an efficiency of 50% and I'm pretty sure thats wrong ..... so just checking

 

[jghrist]

You're right. Th other engineer doesn't know his kW from an MW.

 

[ScottyUK]

Transformers are among the most efficient electrical plant there is. You're absolutely correct, while your colleague is at best confused.


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I don't suffer from insanity. I enjoy it...

 

[cuky2000]

The transformer efficiency is mainly a function of the load-losses (winding or copper losses), no-load-losses (core or iron losses), power factor, loading factor and transformer capacity.

Usually, as larger is the transformer higher is the efficiency.

As mentioned in the above post, the transformer efficiency is typically in the high 90's%

See the enclose link with sample how to calculate approximately the transformer efficiency

http://cuky2000.250free.com/Transf_Eff.jpg