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.