Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
  • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
  • H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
  • H01H33/7023—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by an insulating tubular gas flow enhancing nozzle
  • H01H33/703—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by an insulating tubular gas flow enhancing nozzle having special gas flow directing elements, e.g. grooves, extensions
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
  • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
  • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
  • H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
  • H01H33/901—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism making use of the energy of the arc or an auxiliary arc

Definitions

• Such a switching device arrangement is known for example from European Patent EP 1 372 172 Bl.
• the local switching device arrangement has a switching gas intermediate storage device into which a flow-deflecting device protrudes.
• the flow-deflecting device is substantially tubular, so that switching gas flowing into the switching-gas buffer device is preferably moved along a predetermined path.
• the flow directing device divides the switching gas intermediate storage device and directs incidental switching gas in certain directions. In one wall of the flow deflecting device, an opening is provided, via which subdivided zones of the switching gas intermediate storage device can correspond with one another.
• Switch gas is typically generated during a switching process and accumulates within short time intervals in larger quantities. A flow caused thereby within the switching gas buffer device is therefore relatively intense.
• the intended opening in the wall of the flow-deflecting device is more or less dependent on the flow velocities of the switching gas highly effective. If back pressures or the like arise in the interior of the switching gas buffer storage device, the effectiveness of the opening can be reduced and thus the effect of the switching gas buffer device can be weakened.
• the flow deflection device subdivides the switching gas intermediate storage device and influences the path of a gas flow in the switching gas intermediate storage device.
• switching gas of the switching device can be steered.
• insulating gas be arranged so that the flowing switching gas is automatically sucked cold insulating gas into the channel of the flow deflecting device and during the flow of the switching gas by the flow deflecting a mixing and cooling of the switching gas are made.
• the arc steering nozzle with its arc steering nozzle throat and the switching gas outlet channel by means of a single sintering process at least with parts of the venturi nozzle or the flow deflection device, so that a one-piece composite of sections of the venturi nozzle or of the entire venturi nozzle and the arc guide nozzle can be done.
• the switching gas outlet channel of the Lichtbogenlenkdüse merges into the channel of the flow deflecting device, which is provided with a corresponding cross-sectional reduction, so that this cross-sectional reduction can be used to form a venturi.
• a further advantageous embodiment may provide that the Venturi nozzle has an annular channel in which opens the removal opening.
• the Venturi nozzle represents a cross-sectional constriction in the course of a channel, wherein in the region of the cross-section constriction a removal opening is arranged, via which a medium can be sucked in in addition to the channel of the Venturi nozzle due to the prevailing at the Venturi nozzle flow conditions.
• a cross-sectional reduction can take place in the direction of flow of the Venturi nozzle with varying degrees of reduction. For example, reductions can be provided over oppositely directed cones, the cone angles differing from each other.
• a further advantageous embodiment can provide that temperature-reduced insulating gas is added to the switching gas via the Venturi nozzle.
• the switching device arrangement can be flooded, for example, by an electrically insulating insulating gas.
• This insulating gas is used for safe separation of different electrical potentials within the switching device arrangement. For example, an isolating distance between switching con- Takt Cultureen be isolated by means of electrically insulating insulating gas.
• the switching gas buffer device is also flooded by the insulating gas as part of the switching device arrangement.
• the insulating gas has a comparatively low temperature.
• a switching operation which is optionally connected to an arc, is heated by the arc insulating gas and expanded. This creates hot switching gas.
• hard gas can be emitted from electrically insulating bodies, for example the arc steering nozzle.
• the switching gas is radiated into the Venturi nozzle via a switching outlet channel of the arc guide nozzle and passes through the Venturi nozzle.
• the removal opening of the Venturi nozzle now forms a connection between the nozzle throat of the Venturi nozzle and the volume of the intermediate switching gas storage device.
• the venturi opens into a thermal compression volume.
• the removal opening as an annular gap
• the switching gas outlet channel in one piece with at least one section of the channel of the flow deflection device in order to form part of the Venturi nozzle.
• the transition from the switching gas outlet channel in the flow direction is fluid.
• another preferably tubular element of the flow-deflecting device can follow.
• the first arcing contact piece 2 protrudes into the arc steering nozzle 7, so that an annular channel is formed.
• this front side is surmounted by an auxiliary nozzle 11.
• the auxiliary nozzle 11 is also formed of electrically insulating material, preferably polytetrafluoroethylene and The first arcing contact piece 2 also covers the jacket side. It is provided in the embodiment shown in the figures that a shell-side cover in the interior of the intermediate switching gas storage device 10 is only partially undertaken.
• the burning arc lengthens. Due to the thermal effect of the arc insulating gas, preferably sulfur hexafluoride, nitrogen or other suitable gases or gas mixtures, which purging the switchgear assembly is heated. The heated and expanded insulating gas becomes switching gas. In the area of the switching point, it comes to a
• Hot switching gas is preferably radiated into the switching gas intermediate storage device 10 via the switching gas outlet channel 9 due to the damaging of the arc steering nozzle throat 8.
• the switching gas outlet channel 9 directs switching gas into the venturi 12a.
• the switching gas is additionally accelerated due to the cross-sectional reduction and there is a pressure difference.
• insulating gas present in the switching gas buffer device 10 is now mixed into the switching gas stream.
• the amount of the mixed insulating gas is regulated as a function of the amount of switching gas generated and due to the structural design of the venturi 12a.
• FIG. 2 shows a section through a structurally identically designed switching device arrangement. Only the design of the local Venturi nozzle is different.
• a second variant of a venturi nozzle 12b is provided there.
• the venturi 12b has an annular gap-shaped removal opening 14c.
• the venturi 12b according to FIG. 2 is formed, on the one hand, from a cross-section-reduced section, which adjoins the switching gas outlet channel 9 directly.
• a flow-deflecting device 13a has a gap in the course of a channel bounded by it. As a result, an annular gap-shaped removal opening 14c of the venturi 12b is realized.

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Publications (1)

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ID=42026748

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Cited By (1)

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Citations (3)

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• 2009
  • 2009-02-13 DE DE102009009450A patent/DE102009009450A1/de not_active Withdrawn
• 2010
  • 2010-01-26 EP EP10702851A patent/EP2396799A1/de not_active Withdrawn
  • 2010-01-26 RU RU2011137521/07A patent/RU2011137521A/ru not_active Application Discontinuation
  • 2010-01-26 WO PCT/EP2010/050825 patent/WO2010091943A1/de active Application Filing
  • 2010-01-26 CN CN2010800077747A patent/CN102318026A/zh active Pending

Patent Citations (4)

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