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
  • H01H33/88—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
  • H01H33/91—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 the arc-extinguishing fluid being air or gas
• • 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
  • H01H2033/888—Deflection of hot gasses and arcing products

Definitions

• the invention relates to a high voltage and isolation gas circuit breaker, comprising a fixed arcing contact, a movable arcing contact capable of being coupled to a control mechanism to be actuated between a closed position. , and an open position, a self-blowing device with a piston cylinder associated with a blowing nozzle intended to send a jet of pressurized gas towards the cut-off interval to extinguish the arc drawn between the separate contacts, and means for cooling of the hot gas coming from the cut-off interval and arranged downstream of the blowing nozzle in the gas flow path allowing the exhaust to the outside of the circuit breaker.
• the problem to be solved remains in the scanning of the hot gas outside the cut-off interval between the contacts of the circuit breaker.
• the hot gas generated in the cut-off interval during the interruption of the current escapes into the tank at the earth's potential in the event of an armored circuit breaker.
• the expansion of this hot gas in the tank risks reducing the dielectric strength between the active part of the circuit breaker and the earth / te e, or between the active parts of the phases of the circuit breaker.
• the object of the invention is to improve the dielectric strength of a high voltage circuit breaker, and self-blowing.
• the circuit breaker according to the invention is characterized in that the cooling means comprise a cooling tube serving as a support for the fixed arcing contact, said tube being equipped with through holes allowing the suction of cold gas towards the path of internal flow of the circuit breaker, so that the hot gas is cooled by a first effect of thermal conduction of the tube, and by a second effect of mixing with the cold gas passing through the holes.
• the cooling means comprise a cooling tube serving as a support for the fixed arcing contact, said tube being equipped with through holes allowing the suction of cold gas towards the path of internal flow of the circuit breaker, so that the hot gas is cooled by a first effect of thermal conduction of the tube, and by a second effect of mixing with the cold gas passing through the holes.
• the holes of the cooling tube are arranged in the vicinity of a support member for the fixed main contact, said support member comprising a conductive tube coaxially surrounding the fixed arcing contact.
• the mobile cylinder of the self-blowing device has an outside diameter smaller than the inside diameter of the insulating jacket on which the conductive tube is mounted.
• FIG. 1 is a sectional view of the circuit breaker according to the invention, during the power cut phase
• FIG. 2 is a view identical to that of Figure 1, in the closed position of the circuit breaker.
• a gas circuit breaker in particular with sulfur hexafluoride SF6, comprises an upper conducting tube 14 serving as a support for the fixed main contact 3, and mounted between a cooling tube 1 and an insulating cylindrical casing 4.
• the cooling tube 1 supports the fixed arcing contact 2, which is arranged coaxially inside the fixed main contact 3.
• the insulating casing 4 is arranged on a lower conductive tube 11, itself supported by a support tube 13 made of insulating material.
• An insulating rod 12 is connected to the control mechanism (not shown), being biased upwards when the circuit breaker closes, and downwards when the circuit breakers are opened.
• a rod movable conductor 15 of tubular shape At the end of the insulating rod 12 is a rod movable conductor 15 of tubular shape, said rod 15 supporting the movable main contact 6, the movable arcing contact 7 and a self-blowing device comprising a blowing nozzle 5 integral with the movable main contact 6.
• the movable conductive rod 15 is provided with the axial hole 16 constituting a gas escape route.
• the self-blowing device comprises a blowing cylinder 9 extending under the nozzle 5 and the movable main contact 6, and capable of sliding on a fixed piston 10 secured to the lower conductive tube 11.
• a sliding contact 8 cooperates with the movable conductive rod 15, and provides the electrical connection between the movable contacts 6 and 7 and the lower conductive tube 11.
• Holes 19 are provided between the cooling tube 1 and the conductive tube 14.
• the insulating rod 12 is biased downwards by the mechanism, and causes the separation of the main contacts 6 and 3, then that of the arcing contacts 7 and 2.
• the birth of the arc 17 between the arcing contacts 7 and 2 occurs simultaneously with the intervention of the self-blowing device.
• the displacement of the blowing cylinder 9 downwards causes the compression of the gas in the pistonable space formed between the cylinder 9 and the piston 10.
• the gas thus pressurized escapes through the nozzle 5, and in the opposite direction through the hole 16 axial of the rod 15.
• the gas flow through the nozzle 5 is concentrated at the neck of the nozzle 5, and is directed towards the arc zone by exerting an effect extinguishing on the arc 17, followed by the escape of the hot gas 18 generated by the arc towards the downstream side of the flow path.
• the hot gas 18 passes through the cooling tube 1, and is cooled by the thermal conduction of the cooling tube 1.
• the level of the pressure of the gas inside the cooling tube 1 becomes lower than that of the static gas outside the tube 1 following the flow effect of the hot gas 18.
• This pressure difference generates a suction of the cold gas 20 located outside the tube 1 towards the inside the tube 1, passing through the holes 19.
• a mixture of cold gas 20 with the hot gas 18 then occurs inside the cooling tube 1.
• the hot gas 18 passing through the tube 1 is cooled not only by the conduction effect of the tube 1, but also by the effect of mixing with the fresh gas 20, the temperature of which is lower than that of the hot gas 18.
• the mixed gas 21 is then expelled to the outside of the circuit breaker, ensuring the dielectric characteristics necessary for the phase-to-phase isolation or for the phase-to-ground isolation.
• the cooling effect of the hot gas 18 at the cooling tube 1 is increased even in the event of a reduction in the blowing gas coming from the self-blowing device.
• the presence of the holes 19 thus makes it possible to reduce the actuation energy for blowing the arc.

Landscapes

• Circuit Breakers (AREA)
• Arc-Extinguishing Devices That Are Switches (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=17443851

Family Applications (1)

Country Status (5)

Families Citing this family (12)

Family Cites Families (6)

• 1994
  • 1994-10-31 JP JP6267367A patent/JP2910582B2/ja not_active Expired - Lifetime
• 1995
  • 1995-10-31 US US08/836,057 patent/US5978200A/en not_active Expired - Fee Related
  • 1995-10-31 WO PCT/FR1995/001434 patent/WO1996013844A1/fr not_active Application Discontinuation
  • 1995-10-31 DE DE69506581T patent/DE69506581T2/de not_active Expired - Fee Related
  • 1995-10-31 EP EP95939308A patent/EP0789928B1/de not_active Revoked

Non-Patent Citations (1)

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