Re: Bench Built Isolation Transformer
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Transformers do have a max input voltage related to the core flux of the transformer.
Typical off the shelf transformers run about 15-16K (close to the limit of M6 steel) Gauss at 120VAC per primary winding. Typical variac can produce greater than 135VAC if the lower tap is used. At 135VAC, the transformer core flux may be higher than the core material? will be happy with..
Another reason to put the iso-transformer before the variac.
Bernice
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--- On Tue, 1/15/13, Stefan Trethan wrote:
From: Stefan Trethan
Subject: Re: [TekScopes] Re: Bench Built Isolation Transformer
To:
TekScopes@...
Date: Tuesday, January 15, 2013, 8:26 PM
?
Are you worried about the top end overvoltage, or is there any negative effect at lower voltages?
(I am asking because I had to do it the other way around in one situation, where the output did not reach the desired voltage the "usual" way around).
ST
On Tue, Jan 15, 2013 at 9:13 PM, Geoff Blake <geoff@...> wrote:
The reason to place the variac after the isolation transformer is that the latter will (presumably) be working at its design voltage..
Yes, I am aware of isolated variable voltage transformers.....
Geoff
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