Re: variac

• To: tesla-at-poodle.pupman-dot-com
• Subject: Re: variac
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Tue, 18 Mar 1997 00:32:55 -0600
• Approved: tesla-at-stic-dot-net

Subject: 
        Re: variac
  Date: 
        Mon, 17 Mar 1997 13:33:17 -0500 (EST)
  From: 
        Esondrmn-at-aol-dot-com
    To: 
        tesla-at-pupman-dot-com


In a message dated 97-03-15 06:57:00 EST, you write:

<< Hello to all!
 
 It sure would be nice to hook up a variac transformer on the primary
 side
 of some step up transformers. My question is by how much can one skimp
 on
 the power rating of such devices??
 
 Consider banked neons totaling 15 kv at 150 ma = 2250 W impedance
 matched
 with the primary caps in an equidrive setup. Certainly one wouldn't
need
 a
 20 amperer variac running off of a 110 line. Could one get by with just
 a
 10 amperer variac if running a coil for only short periods of time  (10
 minutes) ?? What have you all been able to get by with safely?
 
 I've been enjoying all the discourse and expertise of the list!
 
                              -Bert S.
  >>
Bert,

I have sucessfully ganged two 10 amp variacs in parallel for heavy neon
sign
transformer use.  Using power factor correction caps on the transformer
primaries will help lower the current.

Ed Sonderman

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