Gas-insulated electrical apparatus filled with a dielectric gas

• US 10,643,764 B2
• Filed: 06/07/2016
• Issued: 05/05/2020
• Est. Priority Date: 06/10/2015
• Status: Active Grant

• Current Assignee: Keya Medical Technology Co. Ltd.
• Original Assignee: General Electric Technology GmbH (GE Vernova, Inc.)
• Inventors: Biquez, Francois, Kieffel, Yannick, Silvant, Sebastien
• Primary Examiner(s): Smith, Courtney L
• Application Number:
  US15/580,981
• Publication Number:
  US 20180197656A1
• Time in Patent Office: 1,428 Days
• Field of Search: None
• CPC Class Codes: H01B 3/56 gases
• CPC Class Codes: H01H 2033/566 Avoiding the use of SF6
• CPC Class Codes: H01H 33/22 Selection of fluids for arc-extinguishing
• CPC Class Codes: H01H 33/982 in which the pressure-generating arc is rotated by a magnetic field
• CPC Class Codes: H02B 13/00 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 Class Codes: H02B 13/055 Features relating to the gas

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.

Claims

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%.