Thyristor pressure regulator with phase sequence protection

Abstract

The invention relates to a thyristor pressure regulator with phase sequence protection. The thyristor pressure regulator comprises three phases of incoming circuit branches, a silicon controlled power controller and a transformer which are connected in sequence by output phases and the thyristor pressure regulator also comprises a phase sequence protection unit, wherein the phase sequence protection unit comprises a sampling input circuit, a comparison logic circuit and an output control circuit; the sampling input circuit is connected with the three phases of incoming circuit branches respectively and is used for acquiring the voltage of each phase; the comparison logic circuit is connected with the output ends of the sampling input circuit; the output control circuit is connected with the output end of the comparison logic circuit; the comparison logic circuit receives the voltage signal output by the sampling input circuit, compares the voltage signal with the preset standard voltage value and outputs the electrical signal to the output control circuit if the received voltage signal is abnormal; the output control circuit drives a contactor to act to disconnect a load and a main power source, thus completing the phase sequence protection function; and the phase sequence protection unit has the advantage of simple circuit realization, can be modularly designed with the existing pressure regulators and is especially applicable to the industrial control field.

Description

technical field [0001] The invention relates to a voltage regulator, in particular to a thyristor voltage regulator with voltage controlled by silicon controlled rectifiers. Background technique [0002] Thyristor voltage regulator is a kind of power control electrical appliance based on thyristor and with intelligent digital control circuit as the core. It is widely used in various industrial fields, such as heat treatment furnace temperature control, diamond press heating, textile machinery; AC and DC motor drive, voltage, current, power, lighting and other stepless smooth adjustment. figure 1 A circuit schematic diagram of a thyristor is given, which is mainly composed of a main power supply access branch, a thyristor power controller, and a transformer. The transformer is connected to an electric load, and the thyristor power controller adjusts Its voltage output, the output voltage is output to the load after the transformer. [0003] At present, the thyristor voltage...

AI Technical Summary

Problems solved by technology

When the electrical equipment runs in a lack of phase, it will not only lose its service life, but also seriously affect the normal production of the factory, and secondary accidents are prone to occur

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