Why transformers are rated in KVA not KW

Reason why transformers are rated in KVA not KW.

While enjoying electrical engineering you must have come across transformers and might have noticed that the power ratings of the transformers are in KVA not in KW which is conventionally used for denoting power ratings in electrical devices.

Well in this post I am going to tell you why the transformers are rated in KVA but not in the conventional KW manner. Before going into this topic you need to know about the various kinds of losses in transformers. Well there are 2 kinds of losses in transformers, they are:

  1. Iron losses
  2. Copper losses
750 KVA Power Transformer

Now since Iron losses depend upon the voltage and copper losses on current so we can infer that the total loss of a transformer is dependent on 2 values that are voltage and current but not on the phase angle between voltage and current which is also known as ‘power factor’.

KVA does not include the term power factor in it while KW does. So since the total losses is dependent only on Voltage and Current values (not on power factor), the ratings of the transformers are also given in terms of VA or KVA.

This question was asked by one of my visitors using the contact page of my blog. If you have any similar queries related to electrical and electronics engineering, do comment below. I would be glad to answer your queries.

Content is copyrighted © www.123mylist.com