FIELD: electricity.
SUBSTANCE: invention relates to the method 60 in a control unit 12 for closing the contactor 1. The control unit 12 is configured to provide movement between the closed position and the open position by driving the electromagnetic circuit coil 6. Method 60 comprises applying 61 a voltage to the coil 6; the determination 62, during the first period of time, the current flowing through the coil 6 and the voltage on the coil 6 and the estimation on this basis of the model parameters for the model predicting the behaviour of the current flowing through the coil 6 as if the contactor 1 remained in the open position, and measurement 63, after the end of the first time period, the current flowing through coil 6 and the difference determination 64 between, on the one hand, the measured current and, on the other hand, the predicted current of the model, and the repetition of measurement 63 and determination 64, by and no state change is detected from the open position to the closed position by the current difference.
EFFECT: loss reduction and increase of the contactor reliability.
18 cl, 10 dwg
