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Calculating transformer loads #217593 09/09/16 03:38 AM
Joined: Jul 2007
Posts: 1,335
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sparkyinak Offline OP
Member
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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Re: Calculating transformer loads [Re: sparkyinak] #217594 09/09/16 09:07 AM
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ampherder Offline
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Volt-amps in = volt-amps out + losses.

Re: Calculating transformer loads [Re: sparkyinak] #217595 09/09/16 01:32 PM
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gfretwell Offline
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It is calculating those "losses" that separate electricians from engineers. wink


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Re: Calculating transformer loads [Re: gfretwell] #217596 09/09/16 02:44 PM
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twh Offline
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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.

Re: Calculating transformer loads [Re: sparkyinak] #217597 09/09/16 05:52 PM
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wa2ise Offline
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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.

Re: Calculating transformer loads [Re: sparkyinak] #217598 09/09/16 11:01 PM
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gfretwell Offline
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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.


Greg Fretwell

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