High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Air-current blowout
Reexamination Certificate
1999-12-29
2001-03-27
Donovan, Lincoln (Department: 2832)
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Air-current blowout
C218S051000, C218S154000
Reexamination Certificate
active
06207917
ABSTRACT:
FIELD OF THE INVENTION
The present invention concerns a compressed gas-blast circuit-breaker having a first, actuatable arcing contact, a second stationary arcing contact, a rated current path, running concentrically with regard to the arcing contacts, the rated (nominal) current path having a first, actuatable rated current contact and a stationary rated current contact, as well as having a compression device which can be connected via a fill-up valve to a low-pressure chamber arranged radially outside of the rated current path. At least the first, actuatable arcing contact has an annular configuration and is supported by a switching tube, through whose outlet switching gases resulting from the breaking operation arrive in a discharge volume. The discharge volume is connected to the low-pressure chamber via discharge openings provided radially with respect to the switching tube.
BACKGROUND INFORMATION
A compressed gas-blast circuit-breaker of this type, regarding its contact arrangement and configuration, is described in, for example, German Patent No. 25 32 088. In this circuit breaker the first, actuatable arcing contact has an annular configuration and is supported by a switching tube through which switching gases resulting from the breaking operation arrive in a discharge volume, which is a low-pressure chamber. In this context, the contact arrangement has a compression device assigned to it, which can be connected to the discharge volume via a fill-up valve, as is also described in German Patent No. 26 18 087.
Irrespective of how compressed gas-blast circuit-breakers of this type are configured, i.e., even if the arcing contacts have a heating space assigned to them that is connected to the compression device via a non-return (stop) valve (a compressed gas-blast circuit-breaker of this type, for example, is described in German Patent 38 33 564), the flow of switching gases resulting from the breaking operation through the switching tube supporting the first, actuatable arcing contact into the discharge volume is always associated with a disadvantage affecting the breaking capacity of the compressed gas-blast circuit-breaker. This is true particularly because in response to a high-speed re-closing, it is unavoidable that the non-ionized quenching gas present in the fill-up valve mixes with the switching gas in the discharge volume contaminated by decomposition products and by vaporized materials.
SUMMARY
An object of the present invention is to provide a compressed gas-blast circuit-breaker in which, in response to a high-speed reclosing, the non-ionized quenching gas, present in the fill-up valve of the compression device and necessary for the subsequent breaking operation, is not polluted by the ionized and contaminated switching gas resulting from a breaking operation.
This objective is achieved by providing for an intake (suction) area between the cylinder base of the compression volume receiving the fill-up valve and the discharge volume, the intake area being spatially separated from the latter, and being connected to the low-pressure chamber via openings provided radially in the rated current path which runs concentrically with respect to the arcing contacts.
In this context, the additionally created intake area is spatially separated from the discharge volume by partitioning the latter from the intake area by a separating wall which is fixedly joined to the inner wall of the rated current path, configured particularly as a stationary compression cylinder. It is advantageous to configure the separating wall as a cowl (cover), which in its cylindrical area can be connected to the inner wall of the rated current path using a welding, soldering or adhesive connection.
If a high-speed re-closing occurs with a compressed gas-blast circuit-breaker configured in this way, the non-ionized quenching gas that is present in the fill-up valve of the compression device and is necessary for the subsequent breaking operation is made available to the compression device via the intake area without being polluted in the process by the ionized and contaminated quenching gas resulting from the breaking operation. Instead, the ionized quenching gas arrives in a discharge volume that is spatially separated from the intake area, before it is fed to the low-pressure chamber.
As a result of the fact, moreover, that in this compressed gas-blast circuit-breaker, the rated current path, in the area of the discharge openings assigned to the discharge volume and provided radially with respect to the switching tube, is surrounded at a distance from the openings by a baffle, it is at the same time achieved that the polluted quenching gas is additionally swirled and, in particular, does not directly encounter the interior wall of the housing. The quenching gas resulting from a breaking operation, however, is temporally delayed with respect to the initiation of the filling operation of the compression device and is fed, in response to a high-speed re-closing, via the intake area to the low-pressure chamber as de-ionized quenching gas, which then is available for further use after being mixed together with the cold quenching gas located here.
REFERENCES:
patent: 5723840 (1998-03-01), Bojic et al.
patent: 574 162 (1976-03-01), None
patent: 25 32 088 (1976-05-01), None
patent: 26 18 087 (1977-10-01), None
patent: 28 44 323 (1979-06-01), None
patent: 30 12 964 (1980-10-01), None
patent: 31 32 825 (1983-01-01), None
patent: 33 15 622 (1983-12-01), None
patent: 38 33 564 (1989-06-01), None
patent: 195 47 522 (1997-01-01), None
patent: 0 436 951 (1991-07-01), None
patent: 2 011 718 (1979-07-01), None
Lehmann Volker
Lobner Friedrich
Donovan Lincoln
Kenyon & Kenyon
Siemens Aktiengesellschaft
LandOfFree
Compressed gas power switch does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Compressed gas power switch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Compressed gas power switch will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2444736