US3824360A - Compressed gas electrical circuit breaker - Google Patents

Compressed gas electrical circuit breaker Download PDF

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Publication number
US3824360A
US3824360A US00277978A US27797872A US3824360A US 3824360 A US3824360 A US 3824360A US 00277978 A US00277978 A US 00277978A US 27797872 A US27797872 A US 27797872A US 3824360 A US3824360 A US 3824360A
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US
United States
Prior art keywords
compressed
circuit breaker
electrical circuit
gas
contact
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
US00277978A
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English (en)
Inventor
H Schramm
E Slamecka
K Martschini
E Pflaum
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Application granted granted Critical
Publication of US3824360A publication Critical patent/US3824360A/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
    • H01H33/88—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
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/06—Insulating body insertable between contacts
    • 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
    • H01H33/24—Means for preventing discharge to non-current-carrying parts, e.g. using corona ring
    • H01H33/245—Means for preventing discharge to non-current-carrying parts, e.g. using corona ring using movable field electrodes

Definitions

  • the shield covers the stationary contact to the closed position of the breaker in which the shield engages the nozzle member to seal the compression space of the breaker.
  • the shield covers a contact area intended for engagement with the movable contact. This contact is therefore removed from the influence of the switching are.
  • the diameter of the stationary contact agrees with the diameter of the nozzle except for the clearance necessary for the movement of the nozzle body.
  • the relatively long length of the beginning of the opening motion This results in pre-compression of the gas enclosed in the blast cylinder, so that the opening arc generated during the subsequent separation of the contacts is immediately blasted by the precompressed gas and is therefore extinguished rapidly.
  • the space inside the switching chamber, required for the pre-compression of the gas, should be as large as possible to assure the predetermined pre compression pressure.,lts size is also determined by the effective cross sectional area of the blast cylinder, and the stroke of the blast cylinder during its travel up to the point where the contacts separate. On the other hand, to save material, the smallest possible dimensions are desired for the switching chamber included within the switching vessel.
  • the invention is directed toward improved space utilization in the design of the switching vessel for a compressed-gas electrical circuit breaker, utilizing a movable contact and a blasting device connected thereto.
  • a nozzle body which is designed in a known manner as a blast piston-is connected with the movable contact, and a spring-loaded shield is provided.
  • the spring-loaded shield is movably guided at the stationary contact and can be displaced by the nozzle body from its open position against the force of its spring. In the closed position the space available for the nozzle body to attain the precompression of the gas also accommodates the shield for equalizing the electrical field in the gap between the contacts.
  • the shield onlyenters this space when it is to be utilized to effectively influence the field. Shields which equalize the electric field in the gap are known, but require relatively large spaces in the known circuit breakers, such as shown in the published German Patent Application 1,055,643.
  • the spring-loaded shield in the compressed-gas circuit breaker according to this invention offers the possibility of a better seal of the nozzle body against the stationary contact, so that the effect of the precompression is enhanced.
  • an intensive blast on the breaking are from the separation of the contacts until the lifting of the nozzle from the stationary contact.
  • the duration of the blast during the time of this motion is proportional to the length of the nozzle.
  • the switching gases are removed through the hollow stationary contact, which is designed as a discharge tube.
  • the discharge of the switching gases can be promoted if the movable contact is also made hollow as a discharge tube for the switching gases.
  • the shield follows the nozzle body, and therefore rests with its free end face against
  • the nozzle body encloses the stationary contact, which penetrates through the nozzle.
  • This together with the shield, which, in the closed position, advantageously rests under spring action against the nozzle body, forms a seal appropriate for the blasting device during the opening motion until the nozzle body is lifted fromthe shield.
  • This also forms an effective seal in the space surrounding the shield.
  • it is connected in the closed breaker position with the interior of the stationary contact by an opening by which undesired pressure differences are thereby equalized.
  • the utilization of the space occupied by the switching vessel of a compressed-gas electrical circuit breaker according to the invention can be improved if, as is provided in an advantageous embodiment, the switching vessel serves, at least in part, as the blast piston cylinder.
  • the nozzle body can be provided with an electrically conducting insert.
  • the utilization of the space occupied by the switching vessel can be further improved thorugh enlarging the usable compression space.
  • the tube is therefore designed as the support for the blast piston. This results 3 l in a shortening of the canals and in a reduction ofthe axial length of the nozzle body.
  • the figure shows a schematic, simplified crosssection presentation of the quenching system for a high-voltage, power circuit breaker. To the right of the center line the closed position is illustrated while the left of the center line illustrates the open position.
  • the metal housing belonging to the circuit breaker which contains sulfur hexafluoride (SP used as the quenching medium at a pressure for example of 8 atm, as well as the drive for the movable contact and the nozzle body, which serves as the blast piston, is not shown.
  • SP sulfur hexafluoride
  • the same quenching system can also be used for open-air circuit breakers of conventional design; The attachment of the quenching system to the bushing of the circuit breaker, which is further required in this case, is not shown in the drawing.
  • the high-voltage power circuit breaker designed as an electrical, compressed-gas, circuit breaker has a switching vessel 1, which by a support 2 accommodates a stationary contact 3, a movable contact 4and a blast piston 5 connected therewith.
  • the blast piston 5 is designed as a nozzle body and contains a nozzle fitting 6 on the outside diameter of the stationary contact 3.
  • a shield 7, loaded by a spring 8, is movably guided.
  • the shield 7. can be displaced from its open position against the force of the spring '8 by the nozzle body 5.
  • the shield 7 covers up a contact area 9 which is intended to engage the movable contact 4.
  • the free end face of the shield 7 touches the rim area of the conduction canals are uniformly distributed over the nozzle 6 and thereby effectively seals the compression space .10..
  • the switching vessel 1 serves at least partially as the cylinder for the blast piston 5.
  • the compression space 10, which is provided for generating a gas flow, is essentially bounded by the switching vessel 1, the movable contact 4 and a contact guide 11.
  • the movable contact 4 as well as the stationary contact 3 are made hollow for the removal of switching gases.
  • the nozzle 6, which surrounds the stationary contact 3 in the closed position, has a length which corresponds approximately to the diameter of the movable contact. This results in a more intensive blast on the interrupt arc, up to the time of the lifting of the nozzle from the stationary contact 3.
  • the shield 7 follows the nozzle body 5 under spring load.
  • the shield 7 serves for the equalization of the electric field in the gap. It consists of insulating material and can be provided on its inside 12 with an electrically conducting coating.
  • the nozzle body 5 contains canals 13 which lead the quenching gas, particularly SP from the space 10 at an circumference of the tube 18.
  • the carrier 2 is provided with an opening 15, which connects the space 14 with the interior of the stationary contact 3.
  • the nozzle body 5 may be provided with an electrically conducting insert 16.
  • the nozzle body 5 is of concave-shape, and with this end face, forms a shield which covers the walls of the blast piston cylinder and preferably acts as a dust and are protector.
  • the concavely shaped end face of the nozzle body 5 corresponds to the shape of the exterior surface of the shield 7, so that toward the end of the opening motion, a ring canal is formed which has a favorable effect on the gas flow.
  • springloaded laminations 17 enclosed by a tube 18 are arranged at the movable contact 4 for the conduction of the current.
  • the tube 18 can be utilized as the support for the blast piston 5.
  • the space required for pre-compression is kept low because of the displaceable shield which only forms an electrode of large area when required, i.e., in the open position. This thereby improves the field configuration in the gap. At the same time the effect of the pre-compression of the gas is enhanced by the seal obtained through the interaction of the nozzle body with the shield.
  • a compressed-gas electrical circuit breaker comprising: a switching vessel having a compression space; a stationary contact including a contact area; a movable contact movable between closed and open posiangle of preferably 30, relative to the axis of the nozzle body. This causes an axial flow component.
  • a blasting device within said vessel including a nozzle member'configured as a piston and connected to said movable contact so as to be movable therewith for compressing the gas in said space when the movable contact is moved into said open position, said nozzle member being configured for directing the compressed gas at the are drawn across said contacts as the same disengage; and a spring-loaded shield mounted on said stationary contact in surrounding relation thereto so as to be displaceable against the force of the spring between a first position whereat said sheild closely surrounds said contact area and a second position away from said contact area, said sheild being adapted to be engaged by said nozzle member so as to simultaneously seal the compression space and displace said shield against the force of the spring from said first position to said second position when the breaker is closed, said shield being further adapted to follow said nozzle member and return to said first position under the force of said spring when the breaker is opened so as to closely cover said contact area
  • a compressed-gas electrical circuit breaker as in claim 2 in which the nozzle member has a length which is approximately 0.5 to 1 times the diameter of the stationary contact.
  • a compressed-gas electrical circuit breaker as in claim 1 in which the nozzle member has canals to feed the quenching gas to the nozzle at a flow angle that causes an axial flow component in the gas.
  • a compressed-gas electrical circuit breaker as in claim 5 in which the angle of the canals in the area v7.
  • a compressed-gas electrical circuit breaker as in claim 1 in which the nozzle member has an electrically conducting insert within the nozzle member.
  • a compressed-gas electrical circuit breaker as in claim 9 further comprising several spring-loaded laminations within a tube disposed around the movable contact and supporting the blast piston.
  • a compressed-gas electrical circuit breaker as in claim 10 in which the nozzle member is of concave shape at its end facing the stationary contact.

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  • Circuit Breakers (AREA)
US00277978A 1971-08-06 1972-08-04 Compressed gas electrical circuit breaker Expired - Lifetime US3824360A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2140284A DE2140284A1 (de) 1971-08-06 1971-08-06 Elektrischer druckgasschalter

Publications (1)

Publication Number Publication Date
US3824360A true US3824360A (en) 1974-07-16

Family

ID=5816486

Family Applications (1)

Application Number Title Priority Date Filing Date
US00277978A Expired - Lifetime US3824360A (en) 1971-08-06 1972-08-04 Compressed gas electrical circuit breaker

Country Status (3)

Country Link
US (1) US3824360A (de)
JP (1) JPS5418740B2 (de)
DE (1) DE2140284A1 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3906180A (en) * 1973-06-04 1975-09-16 Sprecher & Schuh Ag Gas-blast switch
US4000387A (en) * 1974-05-13 1976-12-28 Westinghouse Electric Corporation Puffer-type gas circuit-interrupter
US4161636A (en) * 1975-06-18 1979-07-17 Bbc Brown, Boveri & Company Limited Arc extinguishing arrangement for gas blast type circuit breaker
US6177643B1 (en) 1997-01-17 2001-01-23 Siemens Aktiengeselleschaft High-voltage circuit-breaker having an axially displaceable field electrode
EP1772882A1 (de) * 2005-10-10 2007-04-11 Abb Research Ltd. Druckgasschalter mit Einrichtung zur elektrischen Feldsteuerung
FR2953639A1 (fr) * 2009-12-09 2011-06-10 Areva T & D Sas Disjoncteur a haute tension a ecran amovible pour l'amelioration du gradient de champ
US20120085735A1 (en) * 2009-06-17 2012-04-12 Kabushiki Kaisha Toshiba Gas insulation apparatus

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5133058B1 (de) * 1971-05-28 1976-09-17
JPS5141058Y2 (de) * 1971-05-28 1976-10-06
US4112276A (en) * 1976-09-28 1978-09-05 Westinghouse Electric Corp. Compressed-gas circuit-interrupter having a sleeve-valve for temporarily blocking the orifice throat
CH644969A5 (de) * 1979-09-25 1984-08-31 Sprecher & Schuh Ag Druckgasschalter.
CH652528A5 (de) * 1980-10-31 1985-11-15 Bbc Brown Boveri & Cie Druckgasschalter.
IT1173099B (it) * 1984-01-20 1987-06-18 Sace Spa Interruttore elettrico a fluido compresso di estinzione dell'arco
JPH0614920Y2 (ja) * 1986-03-29 1994-04-20 トヨタ自動車株式会社 溶湯脱ガス吹込み管
DE4343786C1 (de) * 1993-12-17 1995-02-23 Siemens Ag Hochspannungs-Leistungsschalter mit einer Feldelektrode
DE19702822C1 (de) * 1997-01-17 1998-03-26 Siemens Ag Hochspannungs-Leistungsschalter mit einer Feldelektrode

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2551772A (en) * 1946-05-21 1951-05-08 Forges Ateliers Const Electr High-tension interrupting device
US2933575A (en) * 1956-10-22 1960-04-19 Westinghouse Electric Corp Circuit interrupters
US3214545A (en) * 1961-04-11 1965-10-26 Westinghouse Electric Corp Fluid-blast circuit interrupters with pressure-actuated fluid directors
US3527912A (en) * 1967-01-09 1970-09-08 Merlin Gerin Gas blast circuit breaker
US3659065A (en) * 1970-03-06 1972-04-25 Westinghouse Electric Corp Fluid-blast circuit interrupter with delayed moving contact travel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2551772A (en) * 1946-05-21 1951-05-08 Forges Ateliers Const Electr High-tension interrupting device
US2933575A (en) * 1956-10-22 1960-04-19 Westinghouse Electric Corp Circuit interrupters
US3214545A (en) * 1961-04-11 1965-10-26 Westinghouse Electric Corp Fluid-blast circuit interrupters with pressure-actuated fluid directors
US3527912A (en) * 1967-01-09 1970-09-08 Merlin Gerin Gas blast circuit breaker
US3659065A (en) * 1970-03-06 1972-04-25 Westinghouse Electric Corp Fluid-blast circuit interrupter with delayed moving contact travel

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3906180A (en) * 1973-06-04 1975-09-16 Sprecher & Schuh Ag Gas-blast switch
US4000387A (en) * 1974-05-13 1976-12-28 Westinghouse Electric Corporation Puffer-type gas circuit-interrupter
US4161636A (en) * 1975-06-18 1979-07-17 Bbc Brown, Boveri & Company Limited Arc extinguishing arrangement for gas blast type circuit breaker
US6177643B1 (en) 1997-01-17 2001-01-23 Siemens Aktiengeselleschaft High-voltage circuit-breaker having an axially displaceable field electrode
EP1772882A1 (de) * 2005-10-10 2007-04-11 Abb Research Ltd. Druckgasschalter mit Einrichtung zur elektrischen Feldsteuerung
US20120085735A1 (en) * 2009-06-17 2012-04-12 Kabushiki Kaisha Toshiba Gas insulation apparatus
US8674253B2 (en) * 2009-06-17 2014-03-18 Kabushiki Kaisha Toshiba Gas insulation apparatus
FR2953639A1 (fr) * 2009-12-09 2011-06-10 Areva T & D Sas Disjoncteur a haute tension a ecran amovible pour l'amelioration du gradient de champ
WO2011070022A1 (fr) * 2009-12-09 2011-06-16 Areva T&D Sas Disjoncteur a haute tension a ecran amovible pour l'amelioration du gradient de champ

Also Published As

Publication number Publication date
JPS5418740B2 (de) 1979-07-10
JPS4825867A (de) 1973-04-04
DE2140284A1 (de) 1973-02-15

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