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Forum: Rest of the World

May 7th 2018, 4:08 pm

Replies: 11

Not sure where to ask - POWER TRANSFORMERS

Views: 3,689

Posted By winston_1

Re: Not sure where to ask - POWER TRANSFORMERS

Interesting, the losses appear higher than I thought. I'm glad he confirms that at zero load the efficiency is 0%.

All the more reason not to source equipment from the US.

Forum: Rest of the World

May 7th 2018, 3:33 pm

Replies: 11

Not sure where to ask - POWER TRANSFORMERS

Views: 3,689

Posted By winston_1

Re: Not sure where to ask - POWER TRANSFORMERS

Have you got a link to this awful devcice?

Forum: Rest of the World

May 7th 2018, 2:56 pm

Replies: 11

Not sure where to ask - POWER TRANSFORMERS

Views: 3,689

Posted By winston_1

Re: Not sure where to ask - POWER TRANSFORMERS

I can say that and I did. But anyway I can't believe that a 5kVa transformer consumes 1kW off load. Perhaps you mean 1kVa which is not the same thing as you pay for watts not VA

Forum: Rest of the World

May 7th 2018, 10:47 am

Replies: 11

Not sure where to ask - POWER TRANSFORMERS

Views: 3,689

Posted By winston_1

Re: Not sure where to ask - POWER TRANSFORMERS

Do you really believe that all those transformers the power companies use to step down from 33kV etc are that lossy?
Efficiency % equals output power divided by input power times 100. So any...

Forum: Rest of the World

May 6th 2018, 10:02 pm

Replies: 11

Not sure where to ask - POWER TRANSFORMERS

Views: 3,689

Posted By winston_1

Re: Not sure where to ask - POWER TRANSFORMERS

Transformers are actually pretty efficient, probably 97% when used at full load. So your 5kVa one will lose around 150w which will make it hot. There are 2 types of losses, copper losses and iron...

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