Gas-insulated electrical apparatus filled with a dielectric gas

Patent metadata

Field	Value
Publication number	US-10643764-B2
Application number	US-201615580981-A
Country	US
Kind code	B2
Filing date	Jun 7, 2016
Priority date	Jun 10, 2015
Publication date	May 5, 2020
Grant date	May 5, 2020

Abstract

The invention relates to medium- or high-voltage, gas-insulated electrical apparatus (10) comprising: a hermetically sealed chamber (12) filled with a dielectric gas, the gas containing at least one of fluoronitrile, carbon dioxide, dinitrogen or dioxygen; at least two electrical contacts (16, 20) arranged coaxially with a main axis (A) of the chamber (12), of which at least one (20) can move axially inside the chamber (12) between a closed position in which the two contacts (16, 20) are in electrical contact with one another and an open position in which the contacts (16, 20) are located at a distance from one another; and a cut-off mechanism (14) for extinguishing the electric arc that forms between the two contacts (16, 20) as the at least one moving contact (20) moves from the closed position into the open position. The cut-off mechanism is of the rotating arc type.

First claim

What is claimed is:

1. A medium- or high-voltage gas-insulated switchgear comprising:
a hermetically sealed enclosure that is filled with a dielectric gas, said gas comprising fluoronitrile, wherein a volume proportion of the fluoronitrile is less than or equal to 20%;
a first electrical contact and a second electrical contact, the first electrical contact and the second electrical contact being arranged coaxially about a main axis of the enclosure,
wherein the first electrical contact comprises a contact head including a first slot configured at an incline relative to the main axis of the enclosure,
wherein the first electrical contact is movable axially in the enclosure between a closed position in which the first electrical contact and second electrical contact are in electrical contact with each other and an open position in which the first electrical contact and second electrical contact are spaced apart from each other,
wherein the first slot causes current passing through the first electrical contact to have a magnetic field with a radial component,
wherein the radial component of the magnetic field causes a rotation of an electrical arc about the main axis in the enclosure, and
wherein the electrical arc, based on the rotation about the main axis, cools and extinguishes.

2. The switchgear according to claim 1 , wherein the fluoronitrile is heptafluoro-iso-butyronitrile.

3. The switchgear according to claim 1 , wherein the dielectric gas comprises oxygen (O2), wherein a volume proportion of oxygen (O2) is less than or equal to 25%.

4. The switchgear according to claim 1 , wherein the dielectric gas comprises carbon dioxide (CO2) or nitrogen (N2) and in that a volume proportion of carbon dioxide (CO2) or of nitrogen (N2) in the gas is defined in order to provide a balance of filling.

5. The switchgear according to claim 1 , wherein a volume proportion of carbon dioxide (CO2) or of nitrogen (N2) the gas can vary between 55% to 100%.

Assignees

• General Electric Technology Gmbh

Inventors

• Biquez François
• Kieffel Yannick
• Silvant Sébastien

Classifications

• H01H2033/566

  Avoiding the use of SF6 · CPC title

• H01H33/982 Primary

  in which the pressure-generating arc is rotated by a magnetic field · CPC title

• H01B3/56 Primary

  gases · CPC title

• H01H33/22

  Selection of fluids for arc-extinguishing · CPC title

• H02B13/00

  Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle (switchgear having carriage withdrawable for isolation H02B11/00) · CPC title