GAS-INSULATED ELECTRICAL APPARATUS FILLED WITH A DIELECTRIC GAS

• US 20180197656A1
• Filed: 06/07/2016
• Published: 07/12/2018
• Est. Priority Date: 06/10/2015
• Status: Active Grant

• Current Assignee: Keya Medical Technology Co. Ltd.
• Original Assignee: General Electric Technology GmbH (GE Aerospace)
• Inventors: Biquez, Francois, Kieffel, Yannick, Silvant, Sebastien
• Granted Patent: US 10,643,764 B2
• Time in Patent Office: Days
• 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. Medium- or high-voltage gas-insulated switchgear (10) comprising:

a hermetically sealed enclosure (12) that is filled with a dielectric gas, said gas comprising at least fluoronitrile;

at least two electrical contacts (16, 20) that are arranged coaxially about a main axis (A) of the enclosure (12), at least one (20) of which contacts (16, 20) is movable axially in the enclosure (12) between a closed position in which the two contacts (16, 20) are in electrical contact with each other and an open position in which the contacts (16, 20) are spaced apart from each other;

an arc-control mechanism (14) for extinguishing an electric arc that forms between the two contacts (16, 20) during a movement of said at least one movable contact (20) from the closed position towards the open position that is of the rotary arc type,

characterized in that the volume proportion in fluoronitrile in the total mixture lies in the range 0% to 20%.

2. Switchgear (10) according to claim 1, characterized in that the fluoronitrile is heptafluoro-iso-butyronitrile.

3. Switchgear (10) according to claim 1, characterized in that the dielectric gas comprises oxygen (02), wherein the volume proportion of oxygen (O₂) lies in the range 0% to 25%.

4. Switchgear (10) according to claim 1, characterized in that the dielectric gas comprises carbon dioxide (CO₂) or nitrogen (N₂) and in that the volume proportion of carbon dioxide (CO₂) or of nitrogen (N₂) in the total mixture is defined in order to provide the balance of filling.

5. Switchgear (10) according to claim 1, characterized in that the volume proportion of carbon dioxide (CO₂) or of nitrogen (N₂) in the total mixture can vary between is 55% to 100%.