Heavy-duty circuit-breaker with sealing against hot gas
AssigneeABB Technology AG
InventorsDavid Saxl, Stephan Grob, Markus Vestner
Life of this patent
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Abstract
The heavy-duty circuit-breaker with arc blowing has an element which is sensitive to hot gas and/or to gas pressure and is protected by means of a seal against a hot-gas flow. The seal is advantageously a movable non-contacting seal. The seal has a channel entrance for production of a partial hot-gas flow of the hot-gas flow and, connected downstream from this, a channel in order to reduce the mass flow of the partial hot-gas flow, and an expansion chamber in order to expand the volume of the partial hot-gas flow. The expansion chamber is a pressure-relief area. The element may, for example, be a guide element, a contact-making element or a sealing element.
Claims27
A heavy-duty circuit-breaker, in which a hot-gas flow can be formed by an arc which may be struck during a switching process, comprising:
- first and second contact pieces;
- an element which is sensitive to at least one of hot gas and gas pressure;
- and
- a seal provided in order to protect the element against the hot-gas flow, the seal including:
- a channel entrance for introduction of a partial hot-gas flow of the hot-gas flow,
- a channel connected downstream of the channel entrance in a hot-gas flow direction to reduce the mass flow of the partial hot-gas flow, and
- an expansion chamber arranged in an interior portion of the seal to expand the volume of the partial hot-gas flow.
A method for protection of an element, which is sensitive to at least one of a hot gas and gas pressure, of a heavy-duty circuit-breaker including first and second contact pieces, against a hot-gas flow, with a seal being arranged between the hot-gas flow and the element, the seal including a channel entrance for introduction of a partial hot-gas flow of the hot-gas flow, a channel connected downstream of the channel entrance in a hot-gas flow direction to reduce the mass flow of the partial hot-gas flow, and an expansion chamber arranged in an interior portion of the seal to expand the volume of the partial hot-gas flow, the method, comprising:
- outputting the partial hot-gas flow from the hot-gas flow into the channel entrance in the seal;
- reducing the mass flow of the partial hot-gas flow in the channel;
- and
- expanding the volume of the partial hot-gas flow in the expansion chamber.
A heavy-duty circuit-breaker, in which a hot-gas flow can be formed by an arc which may be struck during a switching process, comprising:
- first and second contact pieces;
- an element which is sensitive to at least one of hot gas and gas pressure;
- and a seal provided in order to protect the element against the hot-gas flow, the seal including:
- a channel entrance for introduction of a partial hot-gas flow of the hot-gas flow, a first channel connected downstream of the channel entrance in a hot-gas flow direction to reduce the mass flow of the partial hot-gas flow, an expansion chamber to expand the volume of the partial hot-gas flow, and a second channel arranged downstream of the expansion chamber.
Dependencies are inferred from the claim text.