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Re: Source of Transformers? Yes
From: Alfred A. Skrocki[SMTP:alfred.skrocki-at-cybernetworking-dot-com]
Sent: Saturday, December 13, 1997 1:26 PM
To: Tesla List
Subject: Re: Source of Transformers? Yes
On Friday, December 12, 1997 11:27 AM Greg
[SMTP:ghunter-at-mail.enterprise-dot-net] wrote;
> Coiler Types,
>
> I hate to parade my ignorance before you, but just what is a
> "potential transformer"?
Hi Greg, a "potential transformer" is a constant voltage transformer as
opposed to a constant current or shunted transformer. With a potential
transformer if you short circuit the secondary the primary will draw more
and more current until it will eventually burn out it's own windings in
it's effort to maintain a constant secondary voltage, therefore these need
to have a current limiter in their primary circuit. The current limiter
can consist of a resistive ballast (light in weight but very wastefull of
energy) or an inductive ballast otherwise known as a choke (energy
efficient but very heavy) or in a more sophisticated arrangement an
adjustable choke, typically a choke made such that the iron core can be
adjustably moved in and out of the coil. and last but not least a saturable
reactor which is like a three coil transformer such that the two outer
coils are in opposed position and the center leg of the core has a D.C.
winding and as the D.C. voltage is increased the inductance of the two A.C.
coils decreases, this is also identified in some older literature as a
magnetic amplifier.
Sincerely
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Alfred A. Skrocki
Alfred.Skrocki-at-CyberNetworking-dot-com
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