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PRECISION VECTOR-DIFFERENCE TRANSFORMER WITH HIGH COMMON-MODE REJECTION

F. Cabiati, U. Pogliano, G. C. Bosco

Abstract

The problem of obtaining the difference of two AC voltages represented by vectors with arbitrary amplitude and phase at accuracy levels unattainable with electronic amplifiers is addressed. A solution consisting in a precision complex transformer is presented, together with a mathematical model and some preliminary studies of more general interest. A shielded prototype has performed accuracy levels below 1 &times; 10<sup>-6</sup> from 30 Hz to 12 kHz and a common-mode rejection ratio exceeding 140 dB from 800 Hz to 40 KHz.

Keywords
AC difference, common-mode rejection, precision transformer
Download
IMEKO-TC4-2001-097.pdf
DOI
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IMEKO TC
TC4 - Measurement of Electrical Quantities

Event details

Event
TC4 Symposium 2001
Technical Committee
TC4
Place
Lisbon, PORTUGAL
Time
13 September 2001 - 14 September 2001

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