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#217593 - 09/09/16 12:38 AM Calculating transformer loads
sparkyinak Offline
Member

Registered: 07/08/07
Posts: 1295
Loc: Alaska
Just carious. If I had running data from with the primary or secondary side of a transformer, can the other side be calculated based off of the transformer data plate or perhaps other data?
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#217594 - 09/09/16 06:07 AM Re: Calculating transformer loads [Re: sparkyinak]
ampherder Offline
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Registered: 09/29/11
Posts: 20
Loc: VA
Volt-amps in = volt-amps out + losses.

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#217595 - 09/09/16 10:32 AM Re: Calculating transformer loads [Re: sparkyinak]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
It is calculating those "losses" that separate electricians from engineers. wink
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#217596 - 09/09/16 11:44 AM Re: Calculating transformer loads [Re: gfretwell]
twh Offline
Member

Registered: 03/11/04
Posts: 898
Loc: Regina, Sask.
My guess is the losses are I squared x R, calculated for the line side and the load side. I don't think the hum uses much power.

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#217597 - 09/09/16 02:52 PM Re: Calculating transformer loads [Re: sparkyinak]
wa2ise Offline
Member

Registered: 11/29/02
Posts: 771
Loc: Oradell NJ USA
There's also the losses in the transformer laminations. Better quality steel would have lower losses, but would be more expensive. The transformer would not get as hot while it is powered but unloaded. Probably less hum.

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#217598 - 09/09/16 08:01 PM Re: Calculating transformer loads [Re: sparkyinak]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
If Scott stops by I am sure he can tell us about a whole lot of things that affect "loss" in a transformer. I have bumped around the edges of this stuff but just enough to understand this is more than 2 coils of wire and a core when you get down to the nitty gritty of the difference between the "goesinna" and the "comesoutta". The only thing I know is the loss ends up being mostly heat so the temp this thing runs at is a pretty good clue about the efficiency.
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