Method for controlling power switching apparatus

A method for controlling a power switching apparatus including a sealed tank that is filled with insulating gas, a breaking portion that is configured of a fixed arc contact provided in a fixed-side conductor disposed within the sealed tank and a movable arc contact coming into contact (pole closing) or separating (pole opening) with or from the fixed arc contact and provided in a movable-side conductor, an electric motor that generates a driving force for operating the movable arc contact, a drive circuit that drives the electric motor, a position detecting device that detects a position of an electric motor mover of the electric motor, a controller that controls at least one of a voltage, a current, and a phase supplied to the electric motor based on position information of the electric motor mover detected by the position detecting device,

• wherein the controller includes a phase analysis portion that accumulates a time column of a current or a voltage of a circuit network from a current and voltage monitor detecting the voltage or the current of the circuit network from a predetermined time to a current time, and analyzes at least the phase, a time calculator that calculates a target time, and a motor controller that controls the electric motor via the drive circuit, the method for controlling a power switching apparatus comprising:
• setting a target time (Ts) reaching a predetermined position (Xs) immediately before a target phase by the time calculator during an opening and closing operation of the movable arc contact with respect to the fixed arc contact in the target phase at a predetermined average switching speed;
• and
• controlling the electric motor at a speed equal to or less than the average switching speed immediately before the target phase from an operation start time (T0) to the target time (Ts) by the motor controller.