Core Loss for a 3ph Power Transformer

Hello crvsam

There are variables:

1. Maker
2. Country of Manufacture
3. Year of Manufacture
4. Mains Frequency: 50Hz or 60Hz
5. Temperature
6. Transformer size
7. Number of phases
8. Power Factor
   
9. Other variables

In general the Iron loss (hysteresis) may thus vary between 0.7% and 8% of the total energy input, and is given in heat.

Older transformers generally have higher losses, the newer transformers may have grain-orientated silicon steel for the core stampings, this means lower core loss.

Some large power transformers have been in service for eighty or more years.

Trust that assists you.

Kind Regards....

Also the grade of steel laminitations used for transformer core is responsible for core losses. Thus while evaluating bid of different manufacturer we take the weightage of losses and load the equivalent price to other bidder to bring them at per.

Thanks Sparkstation. You must have a lot of experience with transformers. Just the information I need for my project.

More power...

I would like to see 3 watts per pound. May not always be the case, but a good start.

To find the core loss you just have to measure the power required by the transformer when running with no load. That is the power necessary to magnetise the iron core, and is independent of load.