| 摘要 |
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</SUB>) takes account of the calculation of an instantaneous prediction error (epsilon(Y<SUB>k</SUB>)) which is a function of the difference between the measured secondary current (i<SUB>S</SUB>) and the secondary current (î<SUB>S</SUB>) predicted with the aid of a mathematical model, and in that a second saturation criterion (C<SUB>Phisat</SUB>) takes account of the instantaneous algebraic flux (Phi<SUB>mes</SUB>) calculated by integrating the sampled secondary current (Y<SUB>k</SUB>), 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.
|
