US3513276A - Compressed gas actuated circuit breaker - Google Patents

Compressed gas actuated circuit breaker Download PDF

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Publication number
US3513276A
US3513276A US628486A US3513276DA US3513276A US 3513276 A US3513276 A US 3513276A US 628486 A US628486 A US 628486A US 3513276D A US3513276D A US 3513276DA US 3513276 A US3513276 A US 3513276A
Authority
US
United States
Prior art keywords
gas
switch
compressed gas
switch chamber
circuit breaker
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US628486A
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English (en)
Inventor
Janis Vitins
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BBC Brown Boveri AG Germany
BBC Brown Boveri France SA
Original Assignee
BBC Brown Boveri France SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BBC Brown Boveri France SA filed Critical BBC Brown Boveri France SA
Application granted granted Critical
Publication of US3513276A publication Critical patent/US3513276A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • H01H33/02—Details
    • H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
    • H01H33/56—Gas reservoirs
    • 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
    • H01H33/80—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve
    • H01H33/82—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve the fluid being air or gas

Definitions

  • a gas blast switch includes a switch chamber which is continuously filled with pressurized gas by way of a replenishment pipe line from a pressurized gas storage tank.
  • a pair of separable contacts Inside of the switch chamber are located a pair of separable contacts, at least one of which is hollow and a blast valve which when opened for a brief period at the same time as the contacts separate serves to discharge the gas from the switching point through the hollow contact to atmosphere.
  • An annular flow duct surrounding the blast valve leads in the pressurized gas from an inlet located at the side of the switch chamber and is provided with means for steadying the gas flow before it combines with the other gas already in the switch chamber.
  • the present invention relates to a gas e.g. air blast switch, the switch chamber of which is continuously filled with compressed gas and which is in continuous communication with a compressed gas-storage tank over a replenishment line terminating in the proximity of the switching section, the brief discharge of the quenching gas being effected over at least one hollow contact during the opening of the switch.
  • a gas e.g. air blast switch
  • Gas blast switches are known whose contacts are hollow and arranged inside a switching chamber and which are filled both in the open, and in the closed position of the contacts with compressed gas.
  • an exhaust valve is opened approximately simultaneously as the contacts move apart during the opening of the circuit so that a gas flow is produced which is used to quench the arc formed on the switching section.
  • the exhaust valve is kept open only for a short time.
  • the short open time of the valve is due to the fact that there is a sufficient recovery of the switching section against the return voltage, in addition to a positive quenching of the are.
  • the pressure reduces during the quenching process to such a degree, however, that replenishment of the compressed gas becomes indispensable while the arc quenching process is still being carried on.
  • the switch chamber is placed in constant, i.e. continuous communication with the compressed gas-storage tank by a replenishment line.
  • replenishment of the compressed gas sets in. If the replenishment line opens into the switch chamber in the proximity of the switching section, which is practically always the case if care is taken that the switch chamber is kept within reasonable limits in its dimensions, the outflowing gas mixes with the incoming gas current from the replenishment line, which results in vortices in the range of the switching section, which can have a harmful effect on the recovery of the switching section and lead to so-called late arc-backs.
  • the replenishrnent line pass over on the side of the switch chamber into a flow duct in which means are provided for steadying the gas flow. This way the incoming gas is first steadied before it combines with the gas current which is fed to the switching section.
  • the stationary and hollow contact 2 which carries a sealing gasket 3 with which cooperates the tubular, moving blast valve element 4 in closing position.
  • a cylindrical array of finger contacts 5 moving with the valve.
  • These contacts 5, which form a movable bridge, are connected in closed position of the contact 2, with the likewise stationary nozzle tube 6.
  • the represented position shows the moment when .the blast valve is open and the switching section interrupted.
  • the compressed gas flows, as indicated by arrows, from the switch chamber 1 through the two nozzle tubes 2, 6 into the open air.
  • this switch chamber 1 is connected over a replenishment line 12 with a compressed air-storage tank (not represented).
  • the end of the replenishment line at the side of the switch chamber is designated with 7, and passes over into an annular flow duct 8 surrounding the cylinder 13 in which the annular blast valve 4 slides.
  • annular flow duct 8 surrounding the cylinder 13 in which the annular blast valve 4 slides.
  • a perforated disk 9 and several steadying lattices 10 by which the incoming gas is steadied.
  • a fine screen is secured on the perforated disk, which keeps off even the finest particles.
  • a flow constricting bulge 11 which is made preferably of insulating material, and arranged in the proximity of the switching section, sees to it that the gas flow duct leading radially inward from the lattices to the switching section becomes constantly narrower.
  • the arrangement has the eflfect that the replenishing current of gas is first steadied before it arrives in the switching section.
  • the improved arrangement has the advantage that the switchable voltage of the switch chamber is considerably increased while, at the same time, late arc-backs, i.e. re-ignitions of the switching section after several hundredths of a second, are avoided.
  • inventive concept has been illustrated with a switch construction where both switch contacts are hollow and serve to discharge gas from the switch chamber to atmosphere, the inventive concept can be applied equally as well to a switch construction em ploying only one hollow contact to carry the discharge gases through the gas blast valve to atmosphere.
  • an electrical switch of the gas blast type comprising a switch chamber which is maintained in a constantly gas-pressurized state, a pair of switch contacts located within said switch chamber, at least one of said switch contacts being stationary and hollow to permit gas fiow therethrough, an annular blast valve surrounding said stationary hollow contact, said blast valve being slidable within a cylinder and being movable between a closed state in which said switch contacts are closed and an open state in which said switch contacts are open and gas is discharged from said switch chamber into the gas entrance end of said stationary hollow contact for flow therethrough, an annular gas replenishment duct surrounding said cylinder, a gas replenishment pipe line in constant sommunication with a supply source of pressurized gas and which is connected with the inlet end of said annular duct for delivering pressurized gas thereto from said supply source, the gas outlet end from said annular duct terminating in a constricting bulge for progressively narrowing the cross section of the gas flow path at its discharge end and directing the gas radially inward toward the

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  • Circuit Breakers (AREA)
  • Gas-Insulated Switchgears (AREA)
US628486A 1966-07-27 1967-04-04 Compressed gas actuated circuit breaker Expired - Lifetime US3513276A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1085666A CH448216A (de) 1966-07-27 1966-07-27 Druckgasschalter

Publications (1)

Publication Number Publication Date
US3513276A true US3513276A (en) 1970-05-19

Family

ID=4367539

Family Applications (1)

Application Number Title Priority Date Filing Date
US628486A Expired - Lifetime US3513276A (en) 1966-07-27 1967-04-04 Compressed gas actuated circuit breaker

Country Status (4)

Country Link
US (1) US3513276A (de)
CH (1) CH448216A (de)
DE (2) DE1238980B (de)
SE (1) SE334187B (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2382850A (en) * 1942-06-16 1945-08-14 Gen Electric Gas blast electric circuit breaker
FR1297821A (fr) * 1961-05-19 1962-07-06 Merlin Gerin Disjoncteur à gaz comprimé et procédé de sa fabrication
DE1202380B (de) * 1964-10-28 1965-10-07 Licentia Gmbh Druckgasschalter
US3240910A (en) * 1962-07-05 1966-03-15 Bbc Brown Boveri & Cie Gas blast circuit breaker with stationary spaced tubular contacts and piston actuated contact bridge including blast valve actuated thereby
US3396253A (en) * 1964-07-24 1968-08-06 Bbc Brown Boveri & Cie Gas blast circuit breaker having both bulged-out portion in hollow insulator and gas flow guide tube adjacent switching members

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2382850A (en) * 1942-06-16 1945-08-14 Gen Electric Gas blast electric circuit breaker
FR1297821A (fr) * 1961-05-19 1962-07-06 Merlin Gerin Disjoncteur à gaz comprimé et procédé de sa fabrication
US3240910A (en) * 1962-07-05 1966-03-15 Bbc Brown Boveri & Cie Gas blast circuit breaker with stationary spaced tubular contacts and piston actuated contact bridge including blast valve actuated thereby
US3396253A (en) * 1964-07-24 1968-08-06 Bbc Brown Boveri & Cie Gas blast circuit breaker having both bulged-out portion in hollow insulator and gas flow guide tube adjacent switching members
DE1202380B (de) * 1964-10-28 1965-10-07 Licentia Gmbh Druckgasschalter

Also Published As

Publication number Publication date
DE6603359U (de) 1969-11-20
DE1238980B (de) 1967-04-20
CH448216A (de) 1967-12-15
SE334187B (de) 1971-04-19

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