Determination of the Best Closing Phase Angle for AC Contactor Based on Game Theory

Abstract

Any contactor bounce is undesirable since this causes arcing which shortens the life of the contacts when contacts close. The rebounds and the closing speeds are different with the closing phase angle of the electromagnetic coil voltage switching on when contactors close. This paper discussed the determination of the best closing phase angle of the electromagnetic coil voltage switching on. Taking closing phase angle as optimization variable, the closing velocities of three phase contacts and armature as objectives, and taking moving velocities lower than their worst values as restrictions, the optimization model was established. Game theory was introduced and adopted to solve the multi-objectives optimization problem. Taking CJ20 AC contactor as an example, the best closing phase angle was determined by combing the calculating and testing results.

Analysis of Dynamic Parameters of the Switching-On Process of Electromagnetic Relays Powered by Harmonic Polluted Voltage Source

“…In the case of additional control circuit usage, the supply source problem of ensuring appropriate power supply conditions lies within the applied controller [2][3][4][5][6], while in the case of a driving mechanism energized directly from the power network, there appears to be the problem of potential voltage sags, voltage surges, or supply source distortion occurrences. This method of control is, however, the most frequently used; therefore, the problem of electric energy quality plays a special role in this case.…”