Unshielded air-coupled current transformer
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United States of America Patent
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May 28, 1996
Issued Date -
N/A
app pub date -
Nov 14, 1994
filing date -
Jan 14, 1993
priority date (Note) -
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Abstract
An air-coupled current transformer is provided with a primary current conductor and two secondary coils connected such that the emf induced in each coil by an external disturbing magnetic flux is subtractive, whereas the emf induced by the current in the primary is additive. Two ferromagnetic core pieces enhance the rejection of the emf induced by the disturbing flux. Ceramic spacers are inserted into air gaps between the core pieces for maintaining the gaps fixed to keep the scale factor of the transformer independent of temperature.
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