# US 10,373,785 B2 · Switchgear with a gas-tight insulating space

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- Number: US 10,373,785 B2
- Document ID: US10373785B2
- Status: Granted
- Kind: B2
- Application number: 15/752,684
- Filed: 2016-07-21
- Published: 2018-08-23
- Granted: 2019-08-06
- Earliest claimed: 2015-09-18
- Assignees: Siemens Aktiengesellschaft
- Applicants: Siemens Aktiengesellschaft
- Inventors: Sylvio Kosse
- Web page: https://patentgrep.com/patent/US10373785B2

## CPC

- H01H 33/22: Selection of fluids for arc-extinguishing
- H01H 33/021: {Use of solid insulating compounds resistant to the contacting fluid dielectrics and their decomposition products, e.g. to SF6}
- H01H 33/7023: {characterised by an insulating tubular gas flow enhancing nozzle (H01H33/7038 takes precedence)}
- H01H 33/91: the arc-extinguishing fluid being air or gas
- H01H 85/38: Means for extinguishing or suppressing arc (by powder filling H01H85/18; by mechanical tension applied to fusible member H01H85/36)
- 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

The present disclosure relates to switchgear. Various embodiments may include medium- or high-voltage switchgear with a gas-tight insulating space. For example, a switchgear may include: a gas-tight insulating space where an insulating gas is kept above atmospheric pressure and two switching contacts in the space. At least one of the contacts may movable with respect to a nozzle. The insulating gas may include a mixture of at least 90% by mass of nitrogen and oxygen or nitrogen and carbon dioxide. The nozzle may include a plastic with at least 65% by mass in total of the elements carbon, nitrogen, and oxygen.

## Claims

### Claim 1

A switchgear comprising:
a gas-tight insulating space where an insulating gas is kept above atmospheric pressure; and
two switching contacts arranged in the gas-tight insulating space;
wherein at least one of the two switching contacts is mounted movably with respect to a nozzle;
wherein the insulating gas comprises at least 90% by mass of nitrogen and oxygen or at least 90% by mass of nitrogen and carbon dioxide; and
wherein the nozzle comprises a material made up of at least 65% by mass in total of carbon, nitrogen, and oxygen.

### Claim 2 (depends on 1)

The switchgear as claimed in claim 1, wherein the nozzle comprises less than 1% by mass of fluorine.

### Claim 3 (depends on 1)

The switchgear as claimed in claim 1, wherein the nozzle comprises at least one plastic chosen from the group consisting of: polyamide and polyimide.

### Claim 4 (depends on 1)

The switchgear as claimed in claim 1, wherein the nozzle and the at least one of the two switching contacts are arranged symmetrically in relation to one another with respect to an axis of rotation.