# US 2014/0190939 A1 · Gas insulated switchgear

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- Number: US 2014/0190939 A1
- Document ID: US20140190939A1
- Status: Published application
- Kind: A1
- Application number: 14/133,176
- Filed: 2013-12-18
- Published: 2014-07-10
- Earliest claimed: 2013-01-08
- Assignees: Lsis Co., Ltd.
- Applicants: Lsis Co., Ltd.
- Inventors: Jae Min YANG
- Web page: https://patentgrep.com/patent/US20140190939A1

## CPC

- H01H 33/91: the arc-extinguishing fluid being air or gas
- H01H 3/42: using cam or eccentric
- H01H 33/42: Driving mechanisms
- H01H: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B7/10; electrolytic self-interrupters H01G9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K17/00)

## Abstract

A gas insulated switchgear includes: an enclosure; a stationary contact arm fixedly installed within the enclosure; a movable contact arm installed to be moved within the enclosure such that it is brought into contact with or separated from the stationary contact arm; a cam reciprocating between closing and opening positions to move the movable contact arm; and an actuator moving the cam, wherein the cam includes first and second cam surfaces, and when the cam moves to an opening position by the actuator, movement acceleration of the movable contact arm by the first cam surface is greater than movement acceleration by the second cam surface and a movement distance of the movable contact arm by the first cam surface is smaller than a movement distance by the second cam surface.

## Claims

### Claim 1

A gas insulated switchgear comprising:
an enclosure;
a stationary contact arm fixedly installed within the enclosure;
a movable contact arm installed to be moved within the enclosure such that it is brought into contact with or separated from the stationary contact arm;
a cam reciprocating between a closing position and an opening position to move the movable contact arm; and
an actuator that moves the cam,
wherein the cam comprises first and second cam surfaces, and when the cam moves to the opening position by the actuator, movement acceleration of the movable contact arm by the first cam surface is greater than movement acceleration by the second cam surface and a movement distance of the movable contact arm by the first cam surface is smaller than a movement distance by the second cam surface.

### Claim 2 (depends on 1)

The gas insulated switchgear of claim 1, wherein an average slope of the first cam surface with respect to an axial direction of the movable contact arm is set to be greater than an average slope of the second cam surface.

### Claim 3 (depends on 2)

The gas insulated switchgear of claim 2, wherein the cam further comprises a third cam surface disposed between the first cam surface and the second cam surface, and an average slope of the third cam surface has a value between average slopes of the first and second cam surfaces.

### Claim 4 (depends on 3)

The gas insulated switchgear of claim 3, wherein a recess is provided at an end portion of the second cam surface.

### Claim 5 (depends on 1)

The gas insulated switchgear of claim 1, wherein the cam comprises a space portion provided therein, and the first and second cam surfaces are provided on an inner circumferential surface of the space portion.

### Claim 6 (depends on 5)

The gas insulated switchgear of claim 5, further comprising a cam housing accommodating the cam therein and having a guide bar that guides a movement of the cam.

### Claim 7 (depends on 6)

The gas insulated switchgear of claim 6, wherein a guide rail is provided within the cam housing to guide a movement of the movable contact arm.

### Claim 8 (depends on 7)

The gas insulated switchgear of claim 7, further comprising an insulating rod connected to the movable contact arm and the cam.

### Claim 9 (depends on 8)

The gas insulated switchgear of claim 8, wherein at least a portion of the insulating rod is inserted into the between the guide rails.

### Claim 10 (depends on 8)

The gas insulated switchgear of claim 8, wherein a cam roller in contact with the cam surface is installed at an end portion of the insulating rod.

### Claim 11 (depends on 10)

The gas insulated switchgear of claim 10, wherein both end portions of a rotational shaft supporting the cam roller are inserted into the between the guide rails.

### Claim 12 (depends on 5)

The gas insulated switchgear of claim 5, wherein the actuator comprises an operating lever reciprocating within a predetermined angle range, and further comprises a connection rod that connects the operating lever and the cam.

### Claim 13 (depends on 12)

The gas insulated switchgear of claim 12, wherein a long hole is formed in an end portion of the connection rod, and the connection rod and the operating lever is hinge-coupled through the long hole.