Switchgear

1. A switchgear comprising:

a sealed tank with an insulating gas enclosed therein;

a fixed contact disposed in the sealed tank;

a movable contact coming into contact with or separating from the fixed contact; and

an operating mechanism allowing drive force for movement of the movable contact to be generated, wherein

the operating mechanism for operating the movable contact allows the movable contact to stop at three or more positions,

the operating mechanism generates operating force through current reception;

the switchgear further comprises a power supply driving the operating mechanism, and a control device controlling a pattern and/or timing of a current to be applied from the power supply to the operating mechanism, and

the operating mechanism includes a mover including permanent magnets or magnetic materials arranged in a motion axis direction of the mover while N poles and S poles are alternately inverted, magnetic poles disposed to be opposed to the N poles and the S poles of the mover, and windings, and allows the mover to stop linearly at three or more positions.

2. The switchgear according to claim 1 , wherein

the one operating mechanism is formed of a plurality of operating force generators,

switches are disposed between respective operating force generators and the power supply, and

each respective pair of operating force generators and the switches associated with the respective pair of operating force generators are connected to each other via another switch.

3. The switchgear according to claim 1 , wherein

the mover stops at four positions of close, open, disconnecting, and earthing,

the fixed contact is an earthing-switch fixed electrode, and

the movable contact is an earthing-switch movable electrode.

4. The switchgear according to claim 3 , further comprising:

a pin operating in conjunction with the movable contact, wherein

the earthing-switch movable electrode is rotatably supported on a rotation axis, and has an engagement section that rotates about the rotation axis while being in engagement with the pin, and

during transfer from the disconnecting position to the earthing position, the pin pushes the engagement section, thereby the earthing-switch movable electrode rotates about the rotation axis and comes into contact with the earthing-switch fixed electrode.

5. The switchgear according to claim 4 , further comprising:

a support spring supporting the earthing-switch movable electrode at the earthing position.

6. The switchgear according to claim 3 , further comprising:

a first connecting pin to close, open, and disconnect, the connecting pin moving in conjunction with the mover;

a second connecting pin for earthing, the second connecting pin operating in conjunction with the mover;

a first operating lever to connect to the mover, engage with the first connecting pin to close, open, and disconnect during close, open, and disconnecting operations, respectively, and receive operating force of the operating mechanism; and

a second operating lever to connect to the mover, come in engagement with the second connecting pin for earthing during earthing operation, and receive operating force of the operating mechanism.

7. The switchgear according to claim 1 , wherein

the fixed contact is an earthing-switch fixed electrode;

the movable contact is an earthing-switch movable electrode ; and

the operating mechanism operates the earthing-switch movable electrode.

8. A switchgear comprising:

a sealed tank with an insulating gas enclosed therein;

a fixed contact disposed in the sealed tank;

a movable contact coming into contact with or separating from the fixed contact;

an operating mechanism allowing drive force for movement of the movable contact to be generated, the operating mechanism for operating the movable contact generating operating force through current reception;

a power supply that drives the operating mechanism;

a control device that controls a pattern and/or timing of a current to be applied from the power supply to the operating mechanism; and

outside the sealed tank, an earthing-switch fixed electrode, an earthing-switch movable electrode that comes into contact with or separate from the earthing-switch fixed electrode, and an operating mechanism for operating the earthing-switch movable electrode, wherein

the operating mechanism includes a mover including permanent magnets or magnetic materials arranged in a motion axis direction of the mover while N poles and S poles are alternately inverted, magnetic poles disposed to be opposed to the N poles and the S poles of the mover, and windings, and allows the mover to stop linearly at three or more positions.