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# Three-Phase Delta Sense Transformer

IP.com Disclosure Number: IPCOM000101282D
Original Publication Date: 1990-Jul-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 3 page(s) / 93K

IBM

## Related People

Woodworth, GK: AUTHOR

## Abstract

Three-phase delta power systems supply current to the load on three separate conductors. The voltage present on each line is referenced to each of the other lines and is the vectorial sum of the individual phase voltages at that instant in time. It is not possible to extract the timing relationship of the individual phases, as each line terminal is the result of the additive combination of two separate phases. Angular and polarity relationships between ground reference and each power line phase cannot be determined easily or accurately.

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Three-Phase Delta Sense Transformer

Three-phase delta power systems supply current to the
load on three separate conductors.  The voltage present on each line
is referenced to each of the other lines and is the vectorial sum of
the individual phase voltages at that instant in time.  It is not
possible to extract the timing relationship of the individual phases,
as each line terminal is the result of the additive combination of
two separate phases.  Angular and polarity relationships between
ground reference and each power line phase cannot be determined
easily or accurately.

In electronic control and power conditioning equipment the
positions of the respective phases in relationship to one another are
frequently needed to maintain proper control and timing information.
The presentation of the true phase vectors, as shown in Fig. 1, is a
method of displaying this information.

The design of a sense transformer capable of separating the
line voltages into their respective components is described below.
In Fig. 2, the secondary windings of a delta configuration sense
transformer are center tapped at the 50 percent or midpoints to
provide reference terminals.  These secondary winding reference
points provide a precise method of creating the three true phase
vectors.  In Fig. 3, the true phase A vector is described in this
drawing as the voltage between the midpoint terminal of phase
B-to-phase C and the phase A line terminal.  The phase B...