APPARATUS FOR GENERATING VOLTAGE SAG AND VOLTAGE SWELL

摘要

PURPOSE: An apparatus for generating voltage sag and voltage swell is provided to change a firing angle and generate the voltage sag and the voltage swell by using a thyristor controlled reactor. CONSTITUTION: An apparatus for generating voltage sag and voltage swell includes a transformer(41), a switch(42), a thyristor controlled reactor(43), and a controller(45). The transformer(41) is used for outputting the voltage swell and the normal voltage to the secondary side in proportional to the input voltage of the primary side and the turn number of the secondary coil. The switch(42) is used for outputting selectively the voltage swell and the normal voltage. The thyristor controlled reactor(43) is used for generating the ineffective current by switching the output current of the switch(42) according to a variable firing angle and controlling the output voltage of the switch(42) according the amount of the ineffective current. The controller(45) is used for controlling the selection of the voltage swell and the normal voltage and the firing angle.