Re: status report, questions, etc.
Subject: Re: status report, questions, etc.
From: mrbarton-at-ix-dot-netcom-dot-com (Mark Barton)
Date: Tue, 14 Nov 1995 22:14:57 -0800
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>How does one use and calibrate a current transformer? More
>I know that you put one of the output (220V) leads through the hole,
>then connect an ammeter across the output leads, but why would the
>be limited? I thought non-current-limiting transformers would produce
>much current as the load can draw. Since ammeters are low in resistance,
>wouldn't this short out the meter? Also, since there are 400 turns in the
>current transformer, would I get a 400:1 transformation in voltage? This
>be 88kV. Also, how would I calibrate the current transformer? Should I
>just use ohms law and a big resistor or a few light bulbs?
Current transformers are designed to work into a load called a "burden
resistor". You can calibrate your transformer by using a known load (or
another ammeter) and adjusting the burden R.