Intelligent marshalling combination switch

Abstract

The invention provides an intelligent marshalling combination switch, comprising an AC electronic switch, a magnetic latching relay and a control circuit. The intelligent marshalling combination switch is characterized in that the control circuit is connected with at least a group of combination switches; the structure of the combination switch is that the AC electronic switch is connected in parallel with the magnetic latching relay with one-way contacts; the parallel end is connected in series with the magnetic latching relay with bidirectional contacts and the other parallel end is connected with one end of a single-phase capacitor and one end of a discharge coil; the other end of the single-phase capacitor and the other magnetic latching relay with bidirectional contacts are connected in series with each other and are connected into a return circuit. The intelligent marshalling combination switch can lead the single-phase capacitor to be freely switched without disturbance between the phase lines of the three-phase AC circuit and between the phase line and the zero line of the three-phase circuit, realizes the star-delta unequal arbitray connection of the single-phase capacitor under the control of a controller, completes adjusting the asymmetrical active load of the transformer and compensating the reactive loads at the same time, leads the transformer to be changed from the asymmetrical running to the symmetrical running, saves the power energy, and leads the power supply to have high quality and reliable running.

Description

technical field [0001] The invention relates to the technical field of control, and is an intelligent marshalling composite switch. Background technique [0002] In the conventional reactive power compensation device, the existing technology is to use AC contactor switching capacitor bank, or AC electronic switch switching capacitor bank, or an AC composite switching capacitor bank composed of both in parallel for reactive power compensation. Using AC contactors to switch capacitors has problems such as inrush current and high failure rate; using AC electronic switches to switch capacitors has problems such as harmonics and difficulty in heat dissipation; and the method of switching capacitors composed of AC composite switches in parallel absorbs contact The device has the advantages of small conduction internal resistance, no heat generation, zero-crossing input of AC electronic switch voltage, and zero-crossing current cut-off. At present, there are two types of AC compos...

AI Technical Summary

Problems solved by technology

However, the existing star-connected composite switch such as figure 1 As shown, the star-connected composite switches KA, KB, and KC can only make each single-phase capacitor C be fixedly connected between the phase line and the neutral line of the three-phase AC circuit; the existing delta-connected composite switches such as figure 2 As shown, the delta-connected composite switches Ka, Kb, and Kc can only make the single-phase capacitors C be fixedly connected between the phase lines of the three-phase AC circuit, and the star-connected or delta-connected composite switches cannot connect the single-phase capacitors C Arbitrary switching between the phase line and the phase line, between the phase line and the neutral line of the three-phase AC circuit, there are shortcomings such as single function, poor effect, not conducive to saving electric energy and improving the quality of power supply.

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