Zero crossing point switching control and overheating protection device of compensation capacitor

Abstract

The invention relates to a zero crossing point switching control and overheating protection device of a compensation capacitor. The zero crossing point switching control and overheating protection device comprises an A-phase optoelectronic isolation circuit, a B-phase optoelectronic isolation circuit, a C-phase optoelectronic isolation circuit, a temperature sensor, a power circuit, a communication interface circuit, a state indication circuit, a dial switch circuit, a zero crossing detection circuit, a microprocessor circuit, an A-phase silicon controlled rectifier driving circuit, a B-phase silicon controlled rectifier driving circuit, a C-phase silicon controlled rectifier driving circuit, an A-phase silicon controlled rectifier, a B-phase silicon controlled rectifier, a C-phase silicon controlled rectifier, an A-phase magnetic latching relay driving circuit, a B-phase magnetic latching relay driving circuit, a C-phase magnetic latching relay driving circuit, an A-phase magnetic latching relay, a B-phase magnetic latching relay, a C-phase magnetic latching relay, an A-phase relay driving circuit, a B-phase relay driving circuit, a C-phase relay driving circuit, an A-phase relay, a B-phase relay and a C-phase relay. The device has the advantages that a surface temperature of the capacitor is acquired in real time, and the capacitor is automatically broken when temperature rise exceeds a limit.

Description

technical field [0001] The invention relates to an automatic switching and overheating protection device for a capacitor, which is of great significance for eliminating inrush current and preventing overheating of the capacitor. Background technique [0002] The capacitor switching method used in the field of reactive power compensation in my country has gone through three revolutionary stages, from the original manual switching to AC contactor switching; from AC contactor switching to non-contact switch switching, from Switching from non-contact switch to composite switch, the performance of the product has been continuously improved, but there is also the problem that it cannot work normally when the harmonic content of the power grid is high. Compared with the three products of AC contactor, thyristor and composite switch, the zero-crossing switching control and overheat protection device of the compensation capacitor proposed by the present invention has great innovation ...

AI Technical Summary

Problems solved by technology

[0002] The capacitor switching method used in the field of reactive power compensation in my country has gone through three revolutionary stages, from the original manual switching to AC contactor switching; from AC contactor switching to non-contact switch switching, from Switching from non-contact switch to composite switch, the performance of the product has been continuously improved, but there is also the problem that it cannot work normally when the harmonic content of the power grid is high

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