Silicon controlled composite switch of intelligent zero-crossing switching

Abstract

The invention disclose a silicon controlled composite switch of intelligent zero-crossing switching, which comprises a control circuit and a silicon controlled composite switch, wherein the silicon controlled composite switch comprises a bidirectional silicon controlled rectifier (SCR), a first electromagnetic switch K1, a second electromagnetic switch K2 and a resistor R, wherein the bidirectional SCR is provided with a control terminal G and first and second main terminals T1 and T2; and the first main terminal T1 and the second main terminal T2 of the bidirectional SCR are connected with two ends of a normally open contact K1-1 of the first electromagnetic switch K1 in parallel; a normally open contact K2-1 of the second electromagnetic switch K2 is connected with the resistor R in series; two ends of a series circuit composed of the normally open contact K2-1 of the second electromagnetic switch K2 and the resistor R are connected to two ends of the normally open contact K1-1 of the first electromagnetic switch K1 in parallel. The invention has the advantages of conducting current zero-crossing SCR and is more reliable switchng-out process and the like.

Description

technical field [0001] The invention relates to a thyristor composite switch with intelligent zero-crossing switching, which is a device for controlling capacitor switching, and is an important part of a reactive power compensation device for a power grid, and the performance of the switching element is of great importance to wireless The reliability of the power compensation device plays a very important role. Background technique [0002] In the implementation process of power grid transformation, it is often necessary to add a shunt capacitor reactive power compensation device, which plays a positive role in improving the quality of power supply voltage, tapping the potential of power supply equipment, reducing line loss and saving energy. [0003] Most of the early reactive power compensation devices used switching methods such as AC contactors and thyristor electronic switches. AC contactors will generate large inrush currents and overvoltages when capacitors are switch...

AI Technical Summary

Problems solved by technology

The patent specifically describes that in the conduction process, the thyristor only has a trigger signal, but there is no voltage drop, and the conduction condition of the thyristor is not satisfied, that is, there is no voltage drop between the anode A and the cathode K of the thyristor, so , the compensation device with this structure cannot operate reliably under dynamic conditions

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