[Amps] Magnetic Shunts

[Pat Barthelow]

Hello Bill and Group,

Now, I get to learn something.  This is really great.  I understand the 
concept, but not the implementation of a current limited transformer, and 
remember reading about it when I built a neon sign transformer-based Tesla 
Coil..decades ago.  My neon transformer is rated at 12KV,30ma, and I 
remember that it simply stops arcing when the arc gap or jacobs ladder 
shorted out...No fireworks...Thankfully I passed that Darwinian natural 
selection opportunity...

How would I spot a magnetic shunt, in the core of a transformer, as in the 
microwave application?  What would I look for?

Pat
aa6eg at hotmail.com






>From: Bill Fuqua <wlfuqu00 at uky.edu>
>To: RFlabnotes at aol.com, 2 at vc.net
>CC: amps at contesting.com
>Subject: Re: [Amps] Silly idea?
>Date: Tue, 18 Mar 2003 10:53:03 -0500
>
>A current limiting transformer is the type used in your microwave oven. It 
>has magnetic shunts between the primary and secondary such that if the 
>secondary current exceeds a limit the flux is diverted back to the primary. 
>These shunts sometimes are easily removed (if they have not been welded in 
>place) so that the transformer can be used as a normal transformer. I have 
>not seen them used for filament service but I see no reason why they would 
>not work.
>
>73
>Bill wa4lav
>
>At 10:00 AM 3/18/2003 -0500, RFlabnotes at aol.com wrote:
>>Rich:
>>        This is meant not as a challenge to your answer, but as a request 
>>for
>>more info . What is a current-limiting transformer design? Making it 
>>higher R
>>would certainly do the job, but then the normal operating loss would be 
>>kind
>>of high. So, where is the magic dust?
>>
>>Eric K8LV
>>_______________________________________________
>>Amps mailing list
>>Amps at contesting.com
>>http://lists.contesting.com/mailman/listinfo/amps
>
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