US Patent No. 10,991,528

GAS-INSULATED LOAD BREAK SWITCH AND SWITCHGEAR COMPRISING A GAS-INSULATED LOAD BREAK SWITCH


Patent No. 10,991,528
Issue Date April 27, 2021
Title Gas-insulated Load Break Switch And Switchgear Comprising A Gas-insulated Load Break Switch
Inventorship Nitesh Ranjan, Niederrohrdorf (CH)
Elham Attar, Porsgrunn (NO)
Jan Carstensen, Waldshut-Tiengen (DE)
Magne Saxegaard, Porsgrunn (NO)
Martin Kristoffersen, Porsgrunn (NO)
Stanley Lohne, Porsgrunn (NO)
Michael Schwinne, Ehrendingen (CH)
Martin Seeger, Oberentfelden (CH)
Assignee ABB Schweiz AG, Baden (CH)

Claim of US Patent No. 10,991,528

1. A gas-insulated load break switch, comprising:a housing defining a housing volume for holding an insulation gas at an ambient pressure;
a first main contact and a second main contact, the first and second main contacts being movable in relation to each other in an axial direction of the load break switch;
a first arcing contact and a second arcing contact, the first and second arcing contacts being movable in relation to each other in the axial direction of the load break switch and defining an arcing region in which an arc is adapted to form during a current breaking operation, wherein the arcing region is located, at least partially, radially inward from the first main contact;
a pressurizing system having a pressurizing chamber for pressurizing a quenching gas during the current breaking operation;
a nozzle system arranged and configured to blow the quenching gas, which is pressurized, onto the arc formed in a quenching region during the current breaking operation, the nozzle system having a nozzle supply channel for supplying at least one nozzle with the pressurized quenching gas; and
an interruption chamber, the first main contact being arranged, at least partially, within the interruption chamber;
wherein the first main contact includes at least one pressure release opening formed such as to allow a flow of gas substantially in a radial outward direction,
wherein a total area of the at least one pressure release opening is configured such that during a supply of the pressurized quenching gas, a reduction of the flow of gas out of the pressure release opening is suppressed,
wherein the total area of the at least one pressure release opening is less than 5 times of a cross-section of the nozzle supply channel,
wherein the interruption chamber includes at least one gas outlet opening, a total area of the at least one gas outlet opening being at least the total area of the at least one pressure release opening and/or the total area of the at least one gas outlet opening being more than ? of an area of a cross-section of the interruption chamber,
wherein the at least one gas outlet opening is formed such as to allow, in co-operation with the at least one pressure release opening, the flow of gas substantially in the radial outward direction into an ambient-pressure region of the housing volume.