Single-pole electromagnetic switches based phase split control system of alternating current contactor

Abstract

The invention relates to a single-pole electromagnetic switches based phase split control system of an alternating current contactor. The phase split control system comprises a three-phase alternating current contactor, wherein the three-phase alternating current contactor is formed by combining three single-pole electromagnetic switches matched with an intelligent control module, and the intelligent control module comprises a control core digital signal controller (dsPIC) system, a data sampling and processing coil control loop, a power supply and the like, and can be used for sampling and processing relevant parameters of a switch contact mechanism and an electromagnetic switch, giving out a corresponding control instruction according to a predetermined action procedure and achieving the process control on attraction, absorption and disconnection of the alternating current contactor. Since the single-pole electromagnetic switches are used for respectively controlling each phase of circuit, fixed-phase switch-on and zero-current switch-off of a three-phase main circuit are achieved, a new generation of alternating current electromagnetic electrical product can be formed, the application range of the switch is expanded, the breaking ability of the switch is enhanced, and the electrical lifetime of the switch is prolonged.

Description

Technical field [0001] The invention relates to a phase separation control system of an AC contactor based on a single-pole electromagnetic switch. Background technique [0002] Electromagnetic AC contactor is a kind of control electrical appliance that is mainly used to frequently connect and disconnect the main circuit at a long distance. It is one of the electrical products with large output and wide use in control electrical appliances. The main control objects are motors, transformers, Various electrical equipment such as lighting and resistance furnace. Therefore, its application fields include industry, agriculture, transportation, commerce, people's life and national economy. [0003] When the traditional electromagnetic AC contactor is closed, the impact energy of the core and the contact is large, which is an important reason that affects the life of the electrical machinery. At the same time, it will also cause the rebound phenomenon of the contacts and the iron core, ...

AI Technical Summary

Problems solved by technology

However, due to the different phases of the AC three-phase circuit, it is difficult to realize the zero current breaking control of the three-phase circuit

At present, there is a solution that changes the opening distance of the three-phase contacts, and realizes the pull-in and breaking of the first open phase and the other two circuits at different times in the structure, so as to control the first open phase to achieve zero current breaking. High requirements, especially for switches with different loads and after long-term operation, will cause zero current breaking control failure; another solution is to use a composite switch mode that combines power electronic non-contact switches and contacts. The contact switch is in the off state, the main circuit current flows through the main contacts, and when closing and opening, the current flows through the non-contact switch, which suppresses the arc of the contacts when closing and opening, and realizes arc-free connection and Breaking control, however, there will be no visible fracture in the circuit at this time, which will cause hidden dangers to the safety of the system, and is not applicable in many occasions

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