# US 11,309,693 B2 · Gas-insulated switchgear

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- Number: US 11,309,693 B2
- Document ID: US11309693B2
- Status: Granted
- Kind: B2
- Application number: 16/756,871
- Filed: 2018-01-31
- Published: 2021-06-24
- Granted: 2022-04-19
- Earliest claimed: 2018-01-31
- Assignees: Mitsubishi Electric Corporation
- Applicants: Mitsubishi Electric Corporation
- Inventors: Masahiro Fujioka; Yasuhiro Tsukao
- Web page: https://patentgrep.com/patent/US11309693B2

## CPC

- H02B 13/045: Details of casing, e.g. gas tightness
- H01H 31/26: with movable contact that remains electrically connected to one line in open position of switch
- H02B 13/0358: {Connections to in or out conductors (connectors in general H01R)}
- H02B 13/075: Earthing arrangements
- H02B: BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- 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 a main circuit conductor forming a bus line, a tank having a tubular main body in which the main circuit conductor forming the bus line is provided at its center, and a grounding-switch tank that is a branch pipe connected to the main body, in which a movable contact forming a branch line that branches from the main circuit conductor forming the bus line is provided, where a tubular surface of the main body is spherical, and has an opening that allows the movable contact to pass therethrough.

## Claims

### Claim 1

A gas-insulated switchgear comprising:
a main circuit conductor forming a bus line;
a tank having a tubular main body in which the bus line is arranged at a center of the tank; and
a branch pipe connected to the main body, in which a branch line branching from the bus line is provided, wherein
a tubular surface of the main body is spherical, and has an opening that allows the branch line to pass therethrough on the tubular surface,
a direction the opening is facing is inclined with respect to an axial direction of the main body at an angle other than 90°, and
the branch line is a movable contact of a grounding switch.

### Claim 2 (depends on 1)

The gas-insulated switchgear according to claim 1, wherein
a fixed electrode of the grounding switch is provided at a section midway of the bus line,
the movable contact has a circular cross-section, and
the fixed electrode is spherical, portions of the fixed electrode to be connected to the bus line are flat, and a circular hole that allows insertion of the movable contact thereinto is formed in a spherical portion of the fixed electrode.