Re: Transformer core

• To: tesla-at-pupman-dot-com
• Subject: Re: Transformer core
• From: Bobbaust-at-aol-dot-com (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Wed, 06 Oct 1999 19:40:55 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

In a message dated 10/6/99 5:57:37 AM Eastern Daylight Time, tesla-at-pupman-dot-com 
writes:

<< Original Poster: "Matt Behrend" <electronxlc-at-earthlink-dot-net> 
 
 Hi all,
 
 I have a large transformer core that I want to wind for my inductive 
 ballast - 13mH.  It must handle 3kVA without saturating, so could 
 some of the transformer experts tell me if my core is large enough, 
 and minimum number of turns required?
 
 Overall dimensions are 7.5" x 6.25" x 2.5"
 cross sectional area 1.25" x 2.5" on perimeter sides and 2.5" x 
 2.5" in center leg of the El  shape.
 
 This is from a 1kVA Topaz isolation transformer, but the size of the 
 core seems like it can take much more power.
  >>
I'm not an expert on HV or HF stuff, but seems to me all that counts is the 
number of ampere-turns.  This will determine the flux density which causes 
saturation.  Generally, LF uses a larger cores than HF - the slower cycle 
times allows higher flux buildup and saturation.  It would be nice to know 
how many turns were on the original core. 

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