Switching circuit of single crystal thyristor capacitor

Abstract

The invention discloses a switching circuit of a single crystal thyristor capacitor, and belongs to the technical field of reactive compensation equipment. The switching circuit comprises a first diode, a second diode, a third diode, a fourth diode, a first capacitor, a second capacitor, a third capacitor, a thyristor, a reactor and a pulse transformer. The negative electrode of the first diode isconnected with the A phase of the three-phase power through a first capacitor, and the positive electrode of the first diode is connected with the B phase of the three-phase power through a second capacitor; the negative electrode of the second diode is connected with the C phase of the three-phase power through a third capacitor, and the positive electrode of the second diode is connected with the positive electrode of the first diode and the positive electrode of the reactor; the negative electrode of the third diode is connected with the negative electrode of the first diode, the positiveelectrode of the third diode is connected with the positive electrode of the fourth diode and the positive electrode of the thyristor, and the negative electrode of the thyristor is connected with thenegative electrode of the reactor. The circuit has the advantages of low cost, good energy-saving effect, simple control and no oscillation overcurrent phenomenon.

Description

technical field [0001] The invention relates to a single thyristor capacitor switching circuit, which belongs to the technical field of reactive power compensation equipment. Background technique [0002] Power capacitors are essential electrical equipment for reactive power compensation, energy saving and loss reduction. However, with the improvement of intelligent and automatic production equipment, this requires fast adjustment of reactive power compensation equipment, so power capacitors need to be replaced more and more frequently. Switching, in many factories, the capacitor needs to be switched many times within one minute, however, the switching of the capacitor will inevitably produce a large closing inrush current, and sometimes an operating overvoltage, which not only causes damage to the capacitor itself Greater damage will also cause voltage fluctuations or shocks in the power supply system. Therefore, how to limit the closing inrush current of power capacitors h...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a single thyristor capacitor switching circuit, which solves the problems of high cost, poor energy saving effect, and inrush current suppression ability of the existing switching circuit.

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