Re: Mains Current Monitoring

• To: tesla-at-pupman-dot-com
• Subject: Re: Mains Current Monitoring
• From: Steve Rodway <Legion-at-bigfoot-dot-com> (by way of Terry Fritz <twf-at-verinet-dot-com>)
• Date: Fri, 19 Mar 1999 19:47:57 -0700
• Approved: twf-at-verinet-dot-com

Tesla List wrote:

> Original Poster: "Basura, Brian" <brian.basura-at-unistudios-dot-com>
>
> I'm in the process of building a new power controller for my coils.  The
> question I have is on measuring input (mains) current which can be up to 50
> amps.  I'd prefer to do it without utilizing a shunt.  Can I build a current
> transformer by taking a toroid core, wrapping one turn of a primary leg
> around it, then winding 100 turns around it for a secondary, and hooking the
> secondary to a .5amp meter?
>
> What other ways are available to measure this level of current (50 amps)?
> Should I reconsider using a shunt?

    You might be OK making a current transformer like that, but they arn't
expensive to buy ( about £15 )and get a guaranteed accuracy that way or you
could moving iron meter which will read 50A RMS directly, they do contain an
internal shunt, but the voltage drop really is insignificant.

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