Abstract:
Der gasisolierte Hochspannungsschalter enthält eine in einem Gehäuse (10) eingeschlossenen Kontaktanordnung, die in koaxialer Anordnung zwei längs einer Achse (A) relativ zueinander bewegliche Lichtbogenkontakte, nämlich eine Kontakttulpe (20) mit einer Verengung und einen Kontaktstift (30), aufweist sowie zwei Isolierdüsen (40, 50), die in axialer Richtung mit Abstand zueinander gehalten sind. Eine erste (40) der beiden Isolierdüsen weist einen längs der Achse geführten ersten Strömungskanal (41) mit einer ersten Verengung (42) und die zweite (50) einen längs der Achse geführten zweiten Strömungskanal (51) mit einer zweiten Verengung (52) auf. Bei diesem Schalter ist die Kontakttulpe (20) in einem stromabwärts der ersten Verengung (42) angeordneten Abströmabschnitt (43) des ersten Strömungskanals (41) angeordnet. Die Summe der Strömungsquerschnitte (Ακ, Α Σ ) der Verengung der Kontakttulpe (20) und einer im Abströmabschnitt (43) angeordneten dritten Verengung ist grösser als der Strömungsquerschnitt (A n ) der ersten Verengung (42), wobei durch die Verengung der Kontakttulpe (20) eine erste Teilströmung (L 11 ) einer Löschgasströmung (L 1 ) und durch die dritte Verengung eine parallel zur ersten Teilströmung (L 11 ) gerichtete zweite Teilströmung (L 12 ) führbar ist. Dadurch verbessert sich die dielektrische Wiederverfestigung einer in der Lichtbogenzone (L) befindlichen Trennstrecke stromaufwärts der Kontakttulpe (20) und werden so die Ausschaltleistung und die Betriebssicherheit des Schalters erhöht.
Abstract:
The electrical switching device (1) comprises an arcing contact arrangement with a first arcing contact (4a) attached to an exhaust tube (6) and a mating second arcing contact (4b). At least a first exhaust volume (7) at least partially surrounding the exhaust tube (6) is further provided. Alternatively or additionally at least a second exhaust volume (8) following the second arcing contact (4b) is provided. The electrical switching device (1) further comprises an exterior volume (9) at least partially surrounding the exhaust tube (6), the first exhaust volume (7) and the second exhaust volume (8). The exhaust tube (6), the first exhaust volume (7), the second exhaust volume (8) and the exterior volume (9) form a travel path for a fluid travelling through them. A plurality of projections (13, 16) extending transversally to the longitudinal axis (z) for cooling down the fluid is provided in the travel path of the fluid.
Abstract:
The gas-insulated HV switching device comprises a contact arrangement with two arcing contacts, one of which being designed as a contact tulip (21), an auxiliary nozzle (40) enclosing at least partially the contact tulip (21) and a tubular electrostatic shield (42), which protrudes along an axis (A) beyond a free end of the contact tulip (21). In order improve the switching performance of the switching device the tubular electrostatic shield (42) is electrically connected to the contact tulip (21) and is integrated in an electrical circuit comprising a current limiter (resistors 43, 44) and extending from the shield (42) through the current limiter to an end of the contact tulip (21) which is arranged opposite its free end.
Abstract:
A contact arrangement has a longitudinal axis (z) and comprises at least a first contact (4a) and at least a second contact (4b) interacting electrically and mechanically with each other for closing and opening the contact arrangement. The first contact (4a) is surrounded by a protecting cover element (2) in such a way that a contacting extremity of the first contact (4a) protrudes beyond the cover element (2). The first contact (4a) and the cover element (2) are arranged with respect to one another in such a way that a gap (7) is provided between them along at least a portion of their elongation, wherein the gap (7) has a first opening (10) towards a first volume (15) surrounding the first contact (4a). The cover element (2) comprises at least one chamber (9) connected at least to the gap (2).
Abstract:
An electrical switching device (1) is filled with a dielectric insulating medium comprising an organofluorine compound, in particular a fluoroether, a fluoroamine, a fluoroketone or a fluoroolefin, and comprises at least an arcing contact arrangement with a first arcing contact (4a) and a mating second arcing contact (4b). At least a first intermediate volume(7) is provided downstream from the first arcing contact (4a), and/or at least a second intermediate volume (8) is provided downstream from the second arcing contact (4b). The intermediate volumes (7, 8) are for intermediate pressure enhancement and exhaust gas jet formation for turbulent convective heat transfer to metal walls (7b, 8b) of the exhaust system.In embodiments, the first and/or second intermediate volume (7, 8) is delimited by at least one moveable wall (14a, 14b)arranged transversally to the longitudinal axis (z) and shiftable parallel to it by an actuation device(15, 16, 17).
Abstract:
The electrical switching device (1) comprises at least an arcing contact arrangement with a first arcing contact (4a) and a mating second arcing contact (4b). The first arcing contact (4a) is attached to an exhaust tube (6). At least a first exhaust volume (7) at least partially surrounding the exhaust tube (6) is further provided. Alternatively or additionally at least a second exhaust volume (8) following the second arcing contact (4b) is provided. The electrical switching device further comprises an exterior volume (9) surrounding the exhaust tube (6), the first exhaust volume (7) and the second exhaust volume (8). The exhaust tube (6), the first exhaust volume (7), the second exhaust volume (8) and the exterior volume (9) form a travel path for a fluid travelling through them. A plurality of projections (13, 16) extending transversally to the longitudinal axis (z) for cooling down the fluid is provided in the travel path of the fluid.