Abstract
The arc generated by breaking the main circuit exacerbates the ablation of the contact, which affects the life of the contactor seriously. By controlling the breaking time of the contactor and making contact break in the optimum time zone are the effective ways to weaken the arc. In this article, the contact movement characteristic is concerned directly in order to control the contact breaking time. A back-to-back double-E alternating current contactor is proposed, and its structural parameters are optimized by particle swarm optimization algorithm. The mathematical model of circuit and magnetic is established. A closed-loop control system based on velocity feedback is proposed. The simulation results show that the designed contactor and the proposed control method are correct, and the actual velocity curve of the contact is consistent with the planned motion curve. It can realize zero-crossing breaking of the main circuit to achieve the effect of no-arc breaking.
Highlights
In recent years, China’s power system development has undergone unprecedented new changes
AC690V contactors are often used in wind turbines
The speed is subjected to negative feedback processing such that the speed error is corrected by the proportional integral (PI) regulator to obtain a reference value of the input voltage Uref of the control circuit, as shown in equation (13)
Summary
China’s power system development has undergone unprecedented new changes. If the precise control of the contact-breaking process can be achieved, the electrical wear of contacts can be reduced, and the electrical life of the contactor can be increased by nearly 20 times. A back-to-back double E-type AC contactor is proposed for closedloop control of the contact motion characteristics. By establishing a reasonable speed planning curve, the contacts can be accurately separated in the optimal time zone, and the optimal breaking time is the zero crossing of main circuit current phase. By collecting the speed of the armature, the coil current and suction of the electromagnet 2 can be changed in real time. In essence, the back-to-back double Eshaped AC contactor achieves the fundamental purpose of controlling the contact motion by coordinating the suction and anti-force of the two electromagnets.
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