Error Compensating Method for Instrument Transformer
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United States of America Patent
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Issued Date -
Sep 1, 2011
app pub date -
Jul 27, 2006
filing date -
Aug 9, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Provided an error compensating method for an instrument transformer, in which an error of an instrument transformer is compensated by reflecting hysteresis characteristics of iron core. When such error compensation is performed, a hysteresis loop indicating the relationship between magnetic flux and excitation current is not used as it is, but core-loss resistances and magnetic flux-excitation current curves are used, thereby achieving more precise compensation. According to the present invention, an error of an instrument transformer can be significantly reduced. Therefore, it is possible to manufacture an instrument transformer with high accuracy and to significantly reduce the size of the instrument transformer. Further, a material with high permeability does not need to be used in order to increase the accuracy.
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