| 摘要 |
<p>The method is based on an association of at least two saturation criteria enabling detection of a saturation phase when said criteria are met simultaneously. The invention is characterized in that a first saturation criterion (Ce . sat) takes into account the calculation of an instantaneous prediction error ( (Yk)) as a function of the differential between the measured secondary current (is) and the secondary current (Is) predicted with the aid of a mathematical model, and in that a second saturation criterion (CF.sat) takes into account the instantaneous algebraic flux (F.mes) calculated by integration of the sampled secondary current (Yk), comparing said algebraic flux to a positive threshold (S+, S'+) and to a negative threshold (S-, S'-). Said comparison is initialized by exaggerating the probabilities of meeting the second saturation criterion at the beginning of the measurement, more particularly by an over-estimation (F_rem_haut) of the absolute value of the remanent flux of the transformer.</p> |
