US3674957A - Gas blast switch - Google Patents

Gas blast switch Download PDF

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Publication number
US3674957A
US3674957A US144765A US3674957DA US3674957A US 3674957 A US3674957 A US 3674957A US 144765 A US144765 A US 144765A US 3674957D A US3674957D A US 3674957DA US 3674957 A US3674957 A US 3674957A
Authority
US
United States
Prior art keywords
sleeve
contact
gas
seal
switch
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
US144765A
Other languages
English (en)
Inventor
Gerhard Korner
Wolfgang Schmitz
Friedhelm Dabringhausen
Lothar Gruber
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
Original Assignee
Bbc Brown Boveri & Cie
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 & Cie filed Critical Bbc Brown Boveri & Cie
Application granted granted Critical
Publication of US3674957A publication Critical patent/US3674957A/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
    • H01H33/86—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid under pressure from the contact space being controlled by a valve
    • 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

  • a first contact member in a gas pressure chamber moves from an open position out of contact with a counter-contact member toward the forward position of the counter-contact member until it hits the latter and drives it backwards against the force of a spring.
  • the countercontact member forms a gas seal with a valve sleeve that the counter-contact member pushes back against the force of a second spring.
  • a spring actuated retaining mechanism holds the sleeve in the back position.
  • This invention relates to gas blast switches or air blast switches for opening and closing the electrical connection in a high-power line, and particularly to such switches in which, during opening of the switch, a blast of gas is directed across the contacts at the instant of separation in order to extinguish an arc.
  • Such switches are also called gas blast circuit breakers or air blast circuit breakers.
  • Such switches may be opened and closed by directly moving one switching contact against a spring-loaded nozzle-shaped counter-contact which is forced back by the first contact as the switches close and which move with the first contact so as to remain engaged therewith during the first part of the latters opening movement as the switches open.
  • the movement of the first contact is expected to open an outlet valve which forms a gas blast during the opening movement so as to extinguish the arc.
  • Special means may also be used to open and close the outlet valve at the proper time in response to movement of the counter contact.
  • An object of the invention is to avoid these disadvantages.
  • a further object of the invention is to simplify the mechanism for controlling the outlet valve in response to the counter-contact so that the overall switch is easy to manufacture.
  • vane means respond to the flow of gas through the open seal and constrain the retaining means to release the seal means so that the resilient means force the seal means toward the counter contact and into sealing engagement therewith. In this manner the gas flow is stopped.
  • the sealing means includes a valve sleeve and the second contact includes a cylindrical portion having a round packing engaging an end of the valve sleeve.
  • a high pressure gas chamber is formed around one side of the seal to form the gas flow.
  • the retaining means includes stationary means in sliding engagement with the sleeve and a lock member associated with the sta tionary means and the sleeve.
  • the retaining means include slide means coupled to the vane for causing the lock member to lockingly engage the sleeve and the stationary means when the slide means is in a rest position.
  • Springy means slide the slide means into the rest position. The vane when actuated by movement of gas moves the slide means against the force of the springy means to release the engagement of the lock means with the stationary means and the sleeve.
  • the slide means includes holding means for engaging the lock member so that the slide means is locked against the force of the springy means into an active position.
  • the retaining means includes a stationary tube having an opening therein and coaxial with the sleeve.
  • the sleeve includes a groove.
  • a ball in the opening engages the groove and a cylinder body slidingly mounted with respect to the tube has a straight portion for forcing the ball into the groove and a recess for receiving the ball.
  • a spring urges the body to a position where the straight surface forces the ball into the groove so as to lock the sleeve in position when the counter-contact is forced by the contact into the closed position.
  • the vane is moved by the gas through the open sea] and moves the body against the force of the spring until the recess can receive the ball.
  • the sleeve includes inclined surfaces in the groove for forcing the ball into the recess when the recess is aligned by the gas with the opening so as to hold it there as the sleeve moves the groove out of alignment and the body is thus held in place against the force of the spring even after movement of the gas stops.
  • the recess includes inclined surfaces for forcing the ball into the groove when the fust contact aligns the groove and the sleeve with the opening so that the spring may move the body.
  • the sleeve includes projections for preventing gas flow into the opening.
  • the vanes are composed of projections protruding radially outward from the body.
  • a particularly simple embodiment is obtained by including as part of the seal means a sleeve about which the gas flows and which receives the spring that forces it to follow the trailing movement of the counter-contact on the inside.
  • the retaining means are arranged along its outer circumference and are protected against the pressure gas current by means of radial projections. This results in a device having a relatively small circumference whose sensitive parts are protected.
  • the balls used to lock the sleeve may be replaced by rotary pins.
  • the balls or pins result in a reliable and easily detachable locking arrangement.
  • the strength of this locking arrangement is variable to an extent by varying the number of balls or pins arranged circumferentially.
  • the drawing is a sectional view illustrating a gas blast switch embodying features of the invention, and showing above the center line the switch as enclosed in a metal and in the oft position, and below the center line as an open air switch in the on" position.
  • a directly driven noule-shaped contact member 1, of a so-called nozzle switch is actuated by means not shown to move to the right.
  • the member 1 makes mechanically-resilient electrical! contact with a counter-contact member 2, as shown in the lower section of the drawing.
  • the actuating means for the contact member 1 also withdraw the contact member 1 axially to the left, so as to break the electrical connection with the counter-contact member 2 as shown in the upper section.
  • a spring cup 2a located centrally within the contact member 2 by means of fixed ribs 2b transmits an axial biasing force from a compressed contact spring 3 to the counter-contact member 2.
  • the contact member 1 and counter-contact member 2 are located in a high pressure chamber 4 which is always filled with pressurized gas and which is formed by an enclosing wall 5 and an insulator 6 or by an insulator 7 and a switch chamber 22.
  • the springs 3 and 10 bear against a support plate 11.
  • An inner guide tube and an outer guide tube project coaxially from the plate 11.
  • the inner guide tube 12 forms a central guide for the valve sleeve 9.
  • Bearings 14 mounted between the sleeve 9 and the guide tube 13 allow for free movement of the valve sleeve 9 over an air retaining packing 15.
  • the guide tube 13 guides a flow responsive body 17 which a spring 18 always urges to the left.
  • the valve sleeve 9 is provided with a groove 19 which is engaged by the balls 16 in the on" position illustrated in the lower section of the drawing. In that position the body 17 locks the sleeve 9 by holding the balls inwardly.
  • a projection 20 limits leftward movement of the body 17 so as to allow the latter to bear inwardly on the balls 16.
  • the means not shown drive the contact member 1 to the right against the counter-contact member 2 so as to press the latter resiliently to the position shown in the lower section.
  • the body 17 then presses the balls 16 into the groove 19 of the sleeve 9.
  • the actuating means not shown open the contact between the members 1 and 2 by moving the contact member 1 to the left the spring 3 causes the counter-contact member 2 to follow the contact member 1 over the distance a until the members disconnect.
  • the interiorly pressed balls 16 engaging the groove 19 prevent the sleeve 9 from following the Countercontact member 2 toward the left.
  • the packing 8 thus disengages from the left end of the valve sleeve 9.
  • the pressurized gas stored in the high pressure chamber 4 can then flow into a low pressure chamber 21 and 21' through the nozzle-shaped counter-contact 2.
  • the shape of the spring cup 2a and the switch chamber 22 causes the pressurized gas flowing from the high pressure chamber 4 to the low pressure areas to strike an annular projection 23 on the body 17 and in the path of the flowing gas.
  • the resistance caused by the projection 23 causes the flowing gas to displace the body 17 to the right.
  • the rightward movement of the body 17 lasts until the balls 16 can be forced outwardly into annular groove 24 on the body 17 by inclined surfaces in the groove 19. This releases the valve sleeve 9 so that the latter is moved to the left by the spring 10. The valve then closes.
  • the drawing shows two embodiments of a gas blast switch.
  • One embodiment is shown above the center line and one below.
  • the chamber 21 differs from the chamber 21' below the line.
  • the switch which is common to both of these embodiments appears as being ofi' above the center line and on below the center line.
  • a gas blast switch comprising first contact means mova ble between an open and a closed position, second contact means for contacting said first contact means in the closed position and movable partly toward the open position, resilient means for biasing said second contact means toward the open position so that said second contact means contacts said first contact means over a part of its path as said first contact means moves from the closed position to the open position, movable gas seal means for forming at a first position a gas seal with said second contact means when said first contact means forces said second contact means into the closed position, biasing means for urging said gas seal into sealing engagement with said second contact means when said second contact means is moved by said resilient means toward the open position of said first contact means, retaining means for holding said seal means in the first position whereby said second contact means opens the seal between it and said seal means when said second contact means follows said first contact means toward the open position, and vane means coupled to said retaining means and responsive to flow of gas through the open seal for releasing said seal means so said biasing means forces said seal means toward said second contact means and
  • said retaining means includes stationary means in sliding engagement with said sleeve and a lock member associated with said stationary means in said sleeve.
  • said retaining means includes a slide means coupled with said vane means for causing said lock member to lockingly engage said sleeve and said sta tionary means when said slide means is in a rest position, springy means for driving said slide means into the rest position, said vane when actuated by movement of gas moving said slide means against the force of the springy means to release the engagement of said lock means with said stationary means and said sleeve.
  • said slide means includes holding means for engaging said lock member so that said slide means is locked against the force of said springy means to an active position.
  • said retaining means includes a stationary tube having an opening therein and coaxial with said sleeve, said sleeve having a groove, a ball in said opening engaged with the groove, a cylinder body slidingly mounted with respect to said tube and having a straight portion for forcing said ball into said groove and a recess for receiving the ball, a spring for urging said body to a position wherein the straight portion forces the ball into the groove so as to lock the sleeve in position when the second contact means is forced by movement of the first contact means into the closed position.
  • said recess includes inclined surfaces for forcing the ball into the groove when said first contact means aligns the groove and the sleeve with the opening so that said spring may move said body and the ball into the groove and lock the sleeve.
  • a switch as in claim 10, wherein said sleeve includes blocking means for blocking movement of gas into the openmg.

Landscapes

  • Safety Valves (AREA)
  • Multiple-Way Valves (AREA)
  • Taps Or Cocks (AREA)
US144765A 1970-05-22 1971-05-19 Gas blast switch Expired - Lifetime US3674957A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702024988 DE2024988B2 (de) 1970-05-22 1970-05-22 Druckgasschalter

Publications (1)

Publication Number Publication Date
US3674957A true US3674957A (en) 1972-07-04

Family

ID=5771773

Family Applications (1)

Application Number Title Priority Date Filing Date
US144765A Expired - Lifetime US3674957A (en) 1970-05-22 1971-05-19 Gas blast switch

Country Status (6)

Country Link
US (1) US3674957A (enrdf_load_stackoverflow)
CH (1) CH514929A (enrdf_load_stackoverflow)
DE (1) DE2024988B2 (enrdf_load_stackoverflow)
FR (1) FR2093567A5 (enrdf_load_stackoverflow)
GB (1) GB1296642A (enrdf_load_stackoverflow)
NL (1) NL7103995A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1675145A1 (de) * 2004-12-23 2006-06-28 ABB Technology AG Hochleistungsschalter mit Dichtung gegen Heissgas

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1427982A (fr) * 1964-12-30 1966-02-11 Alsthom Cgee Dispositif de verrouillage de contacts pour disjoncteurs
US3475575A (en) * 1965-07-26 1969-10-28 Bbc Brown Boveri & Cie Pressure gas operated circuit breaker with pressurized contact chamber
US3590187A (en) * 1970-01-21 1971-06-29 Westinghouse Electric Corp Separable contact and blast-valve structure for a compressed-gas circuit breaker

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1427982A (fr) * 1964-12-30 1966-02-11 Alsthom Cgee Dispositif de verrouillage de contacts pour disjoncteurs
US3475575A (en) * 1965-07-26 1969-10-28 Bbc Brown Boveri & Cie Pressure gas operated circuit breaker with pressurized contact chamber
US3590187A (en) * 1970-01-21 1971-06-29 Westinghouse Electric Corp Separable contact and blast-valve structure for a compressed-gas circuit breaker

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1675145A1 (de) * 2004-12-23 2006-06-28 ABB Technology AG Hochleistungsschalter mit Dichtung gegen Heissgas
WO2006066429A1 (de) * 2004-12-23 2006-06-29 Abb Technology Ag Hochleistungsschalter mit dichtung gegen heissgas
US7732727B2 (en) 2004-12-23 2010-06-08 Abb Technology Ag Heavy-duty circuit-breaker with sealing against hot gas
CN101088135B (zh) * 2004-12-23 2012-04-18 Abb技术有限公司 具有针对热气的密封件的大功率开关

Also Published As

Publication number Publication date
NL7103995A (enrdf_load_stackoverflow) 1971-11-24
DE2024988B2 (de) 1971-04-29
FR2093567A5 (enrdf_load_stackoverflow) 1972-01-28
GB1296642A (enrdf_load_stackoverflow) 1972-11-15
CH514929A (de) 1971-10-31
DE2024988A1 (enrdf_load_stackoverflow) 1971-04-29

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