Method for detecting saturation in a current transformer
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United States of America Patent
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Issued Date -
Jun 30, 2005
app pub date -
Jul 28, 2004
filing date -
Jan 29, 2002
priority date (Note) -
Abandoned
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Abstract
The method is based on associating at least two saturation criteria for detecting a saturation phase when said criteria are satisfied simultaneously. It is characterized in that a first saturation criterion (C.sub..epsilon. sat) takes account of the calculation of an instantaneous prediction error (.epsilon.(Y.sub.k)) which is a function of the difference between the measured secondary current (i.sub.S) and the secondary current (.sub.S) predicted with the aid of a mathematical model, and in that a second saturation criterion (C.sub..PHI.sat) takes account of the instantaneous algebraic flux (.PHI..sub.mes) calculated by integrating the sampled secondary current (Y.sub.k), comparing said algebraic flux to a positive threshold (S+, S'+) and to a negative threshold (S-, S'-). Said comparison is initialized with exaggerated probabilities of satisfying said second saturation criterion at the start of the measurement, in particular by overestimating (.PHI._rem_high) the absolute value of the remanent flux of the transformer.
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