A method for controlling a power switching apparatus to solve problems including: setting a target time reaching a predetermined position immediately before a target phase by a time calculator during an opening and closing operation of a movable arc contact with respect to a fixed arc contact in a target phase at a predetermined average switching speed; and controlling an electric motor at a speed equal to or less than an average switching speed immediately before the target phase from an operation start time to the target time by a motor controller.

The switching apparatus and the method are for varying the impedance of a phase line of a segment of an electrical power line. The phase line includes n conductors electrically insulated from each other and short-circuited together at two ends of the segment. The apparatus comprises a controllable interrupter connected in series for each conductor; a parameter detector; a first controller for controlling the interrupters; and a disabling unit for disabling the interrupters. The disabling unit comprises n controllable switches associated with the interrupters, position detectors for detecting which of the interrupters is closed, and a second controller having a command output to command the controllable switches and ensure that, at all operating times, at least one of the interrupters is closed and disabled.

The invention is intended to provide a circuit breaker or a circuit breaker operating method enabling a current interruption action to be performed efficiently. A circuit breaker is characterized in that includes a fixed contact and a movable contact that comes in and goes out of contact with the fixed contact; a main circuit conductor that is electrically connected to the fixed contact and the movable contact; an operating mechanism including a mover configured by concatenating permanent magnets or magnetic materials alternately having opposite N and S magnetic polarities along the direction of motion axis of the movable contact and magnetic poles disposed to face the N and S magnetic polarities of the mover and wound with windings; a current detector that detects a current flowing through the main circuit conductor; and a control device that varies the amount of a current to be supplied to the windings of the magnetic poles, depending on a current value detected by the current detector.

The invention is intended to provide a circuit breaker or a circuit breaker operating method enabling a current interruption action to be performed efficiently. A circuit breaker is characterized in that includes a fixed contact and a movable contact that comes in and goes out of contact with the fixed contact; a main circuit conductor that is electrically connected to the fixed contact and the movable contact; an operating mechanism including a mover configured by concatenating permanent magnets or magnetic materials alternately having opposite N and S magnetic polarities along the direction of motion axis of the movable contact and magnetic poles disposed to face the N and S magnetic polarities of the mover and wound with windings; a current detector that detects a current flowing through the main circuit conductor; and a control device that varies the amount of a current to be supplied to the windings of the magnetic poles, depending on a current value detected by the current detector.

A manual charging apparatus for a vacuum interrupter, including a motor for charging a closing spring mounted on a vacuum interrupter; a charging shaft configured to rotate by a rotational force of the motor; and a manual charging handle coupled to one end of the charging shaft and configured to manually rotate the manual charging handle, wherein the manual charging handle includes an insertion part formed in an cylindrical shape and inserted into one end of the charging shaft; an extension part vertically bent from the insertion part and extended to increase a revolution torque; and a handle part vertically bent from the extension part and configured to apply a manual operation force, and wherein the insertion part includes a rotation restriction means configured to restrict a rotation in one direction.

A manual charging apparatus for a vacuum interrupter, including a motor for charging a closing spring mounted on a vacuum interrupter; a charging shaft configured to rotate by a rotational force of the motor; and a manual charging handle coupled to one end of the charging shaft and configured to manually rotate the manual charging handle, wherein the manual charging handle includes an insertion part formed in an cylindrical shape and inserted into one end of the charging shaft; an extension part vertically bent from the insertion part and extended to increase a revolution torque; and a handle part vertically bent from the extension part and configured to apply a manual operation force, and wherein the insertion part includes a rotation restriction means configured to restrict a rotation in one direction.

The invention provides a switchgear that is capable of increasing a degree of freedom of a position of a moving arcing contact in a circuit breaker, does not require dimension management of components and a mechanism for adjusting a position of the moving arcing contact, and is capable of simplifying fabrication of components and assembly of devices and reducing cost. The switchgear according to the invention includes: a circuit breaker that is configured of a fixed arcing contact installed at a fixed-side conductor and a moving arcing contact installed at a moving electrode that opens and closes with respect to the fixed arcing contact; a linear motor that generates drive force for operating the moving arcing contact; a position detecting device that detects a position of a moving element of the linear motor; a contact detecting device that detects a contact state between the fixed arcing contact and the moving arcing contact; and a control device that sets a moving range of the moving arcing contact by controlling a voltage and a phase to be supplied to the linear motor based on the contact state between the fixed arcing contact and the moving arcing contact, which is detected by the contact detecting device, and position information of the moving element of the linear motor, which is detected by the position detecting device.

The invention provides a switchgear that is capable of increasing a degree of freedom of a position of a moving arcing contact in a circuit breaker, does not require dimension management of components and a mechanism for adjusting a position of the moving arcing contact, and is capable of simplifying fabrication of components and assembly of devices and reducing cost. The switchgear according to the invention includes: a circuit breaker that is configured of a fixed arcing contact installed at a fixed-side conductor and a moving arcing contact installed at a moving electrode that opens and closes with respect to the fixed arcing contact; a linear motor that generates drive force for operating the moving arcing contact; a position detecting device that detects a position of a moving element of the linear motor; a contact detecting device that detects a contact state between the fixed arcing contact and the moving arcing contact; and a control device that sets a moving range of the moving arcing contact by controlling a voltage and a phase to be supplied to the linear motor based on the contact state between the fixed arcing contact and the moving arcing contact, which is detected by the contact detecting device, and position information of the moving element of the linear motor, which is detected by the position detecting device.

A switch includes a fixed contact, a movable contact, a motor to drive the movable contact via a drive mechanism that converts rotational motion into linear motion, and a drive controller to control driving of the motor. The drive controller controls a rotation speed of the motor such that during an opening operation of the switch, a moving speed of the movable contact in a part of an entire moving range of the movable contact is lower than a moving speed of the movable contact during a closing operation of the switch. The part of the entire moving range includes an interrupting point at which an arc current is extinguished.

A switch includes a fixed contact, a movable contact, a motor to drive the movable contact via a drive mechanism that converts rotational motion into linear motion, and a drive controller to control driving of the motor. The drive controller controls a rotation speed of the motor such that during an opening operation of the switch, a moving speed of the movable contact in a part of an entire moving range of the movable contact is lower than a moving speed of the movable contact during a closing operation of the switch. The part of the entire moving range includes an interrupting point at which an arc current is extinguished.