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US3047697A - Latch-open mechanism for air blast circuit breaker - Google Patents

Latch-open mechanism for air blast circuit breaker Download PDF

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Publication number
US3047697A
US3047697A US817645A US81764559A US3047697A US 3047697 A US3047697 A US 3047697A US 817645 A US817645 A US 817645A US 81764559 A US81764559 A US 81764559A US 3047697 A US3047697 A US 3047697A
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US
United States
Prior art keywords
housing
latch
pressure
contact
movable 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
US817645A
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English (en)
Inventor
Forwald Haakon
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.)
Allmanna Svenska Elek SA Aktie
ALLMANNA SVENSKA ELEKTRISA AB
Original Assignee
Allmanna Svenska Elek SA Aktie
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 Allmanna Svenska Elek SA Aktie filed Critical Allmanna Svenska Elek SA Aktie
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Publication of US3047697A publication Critical patent/US3047697A/en
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Expired - Lifetime legal-status Critical Current

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    • 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
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/30—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator
    • H01H33/32—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator pneumatic
    • 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
    • H01H33/46—Interlocking mechanisms

Definitions

  • This invention relates to a contact latch mechanism for pneumatically operated circuit breakers, and more specifically relates to a latch mechanism which latches the contacts open responsive to a decrease in the air pressure maintaining the contacts open against the force of a closing spring.
  • Pneumatically operated circuit breakers are well known where a stationary contact is carried in a first housing and the movable contact, and its operating mechanism is carried in a second housing removably connected to the first housing.
  • the first housing can be under pressure to provide an air blast for extinguishing an are drawn when the movable contact moves to a disengaged position.
  • the movable contact is normally biased toward an engaged position by a closing spring means, and is moved to the open position and held in the open position by a fluid under pressure, such as air.
  • latch means have been provided where a physical latch is connected to the movable contact responsive to a predetermined loss of air pressure.
  • This latch mechanism has been connected to the first housing which contains the stationary contact structure so that when the latch is operated, the second housing contain ing the movable contact and its operating mechanism is physically latched to the first housing. Therefore, it is not possible to remove the second housing from the first housing for inspection and repair.
  • the principle of the present invention is to provide a latch mechanism which is carried by the second housing containing the movable contact and its operating mechanism so that when the latch operates due to a loss in operating pressure, the housing carrying the latch and the movable contact structure in the latched open position may be removed for inspection and repair of the pneumatic system or associated components which have failed.
  • the latch structure may be constructed to latch the removable contact along its axis whereby the force exerted by the closing spring against the movable contact will not cause rocking or tilting of the movable contact.
  • the primary object of this invention is to latch the contacts of a pneumatically operated circuit interrupter in the open position responsive to a predetermined loss in operating pressure.
  • Another object of this invention is to provide a novel latch structure for pneumatically operated circuit breakers wherein the movable contact is latched open upon the failure of air pressure and the housing, portion containing the latch may be easily disassembled for repair and maintenance of the mechanism.
  • a further object of this invention is to provide a latch mechanism for a movable circuit breaker contact which is operated and maintained in the disengaged position by 3,047,697. Patented July 31, 1962 2 fluid pressure wherein the latch operates responsive to a predetermined loss of air pressure and permits disassembly of the unit.
  • FIGURE 1 shows a side cross-sectional view of one embodiment of the novel latch structure of the invention in combination with a pneumatically operated circuit breaker.
  • FIGURE 2 shows a detailed view of the latch member carried by the movable contact.
  • a first housing 10 is normally filled with compressed air derived from a com pressed air source 11 which is connected to housing 10 by conduit 12.
  • Conduit 12 has a valve 13 therein for disconnecting housing 10 and source 11.
  • a terminal bushing 14 is connected at the top of housing 10 in sealed relation and is terminated at its lower end by a stationary contact 15 connected at the bottom of the conductor extending through the terminal bushing 14.
  • a second housing 16 carries the movable contact structure and its operating mechanism and is clamped to the stationary contact housing 10 in any desired manner, as by the bolt means 17.
  • housing 16 carries a movable nozzle-shaped contact 18 which is connected to a piston means 19 by the connecting rod 20.
  • the connecting rod 20 has an extending portion 21, best seen in FIGURE 2, which is terminated in a bifurcated portion 22 which carries a pin 23, as shown in FIGURE 2.
  • Rod 20 and pin 23 are movable downwardly into engagement with a pawl 24 which is pivotally mounted on pivot 25, and is movable into latching engagement with pin 23.
  • rod 20 and its pin 23 form the first portion of a latch mechanism, while pawl 24 forms a second and cooperating portion of a latch mechanism.
  • the pawl 24 is driven by a link 26 which is connected to a piston 27 carried in cylinder 28 and is movable responsive to the pressure in conduit 30 which is connected to conduit 12.
  • a spring 29 biases piston 27 downwardly to move pawl '24 to its latching position, but this motion is normally prevented by the pressure beneath piston 27 from conduit 12. When this pressure fails, however, piston 27 will drop under the influence of spring 29 and pawl 24 will move to its latching position.
  • the movable contact 18 is normally biased to the engaged position shown in FIGURE 1 by closing spring 31 which is seated beneath piston 19 and biases piston 19 upwardly.
  • a valve 32 is movable to connect the upper area 33 adjacent the top of the cylinder containing piston 19 to the pressure of conduit 12 over the conduit 34.
  • the lower surface of piston 19 is connected to the external pressure or atmospheric pressure.
  • valve 32 connects conduit 12 to conduit 34
  • the pressure in volume 33 increases to overcome the spring force of closing spring 31 so that the contacts are driven to their disengaged position.
  • the air blast action during contact disengagement may be noted.
  • the upper end of the movable contact Prior to opening, the upper end of the movable contact is sealed to the stationary contact in air tight relation. During the opening operation, however, this seal is defeated and the compressed air contained in housing 10 will be forced through the centre of the movable contact and through the arc, and then through check valve means 35. The air blast across the opening contacts is continued until piston 19 drops toclose off check valve 35. The movable contact will thereafter he held-open by the high pressure of volume 33 which imparts a greater force to the top of piston 19 than does the spring 31 to the bottom of piston 19.
  • valve 32 In order to close the circuit breaker, valve 32 is operated so that conduit 34 is vented to the external air whereby the pressure in volume 33 decreases and the spring force of spring 31 closes the contacts.
  • the mechanical latch including pawl 24 when the movable contact 18 is held in its disengaged position by means of the high pressure in volume 33, the mechanical latch including pawl 24 will be disengaged.
  • the piston 27 When, how ever, there is a leak, or the pressure of source 11 decreases below a predetermined value so that there may be an unintentional closing of the movable contact, the piston 27 will drop before the spring 31 can drive the contacts closed, whereby pawl 24 will engage pin 23 to latch the contacts open. Thereafter, a complete loss of air pressure will be incapable of closing the movable contact against the latch mechanism. When pressure is returned, the piston 27 will be driven upwardly to release this latching engagement so that normal operation can proceed.
  • the housing 16 can be removed from housing so that the mechanism may be inspected and repaired. This is to be contrasted to the previous types of pressure responsive latches wherein the latch mechanism formed a connection between housings, such as housing 10, and the lower housing 16, so that the disconnection of the housings was not possible.
  • the latch mechanism operates along the axis of the movable contact. Therefore, when contact rod is latched open, it will not be tilted by the force of closing spring 31.
  • a latch mechanism for a pneumatically operated circuit breaker including a first and second housing, said first housing being removably connected to said second housing, said first housing carrying a first contact, said second housing carrying a second contact movable between an engaged and disengaged position with respect to said first contact when said first housing is connected to said second housing, a pneumatic operating means for moving and maintaining said second contact out of engagement with respect to said first contact, a source of air under pressure, connections from such source to said pneumatic operating means and to said first housing, a valve in said connection to said pneumatic operating means, latch means engageable with said movable contact and movable to a latching position to latch said movable contact in said disengaged position, and means operatively connected to said latch means and responsive to a predetermined pressure condition in said compressed air source to move said latch means to latching position upon the drop of pressure in said first housing below a predetermined pressure and to move said latch means to unlatching position upon a rise of pressure in said first
  • a latch mechanism for a pneumatically operated circuit breaker said pneumatically operated circuit breaker including a first and second housing, said first housing being removably connected to said second housing, said first housing carrying a first contact, said second housing carrying a second contact movable between an engaged and disengaged position with respect to said first contact when said first housing is connected to said second housing, a pneumatic operating means for moving and maintaining said second contact out of engagement with respect to said first contact, a source of air under pressure, connections from such source to said pneumatic operating means and to said first housing, a valve in said connection to said pneumatic operating means, latch means engageable with said movable contact and movable to a latching position to latch said movable contact in said disengaged position, and means operatively connected to said latch means and responsive to a predetermined pressure condition in said compressed air source to move said latch means to latching position upon the drop of pressure in said first housing below a predetermined pressure and to move said latch means to unlatching position upon a rise of pressure in said first housing above
  • a latch mechanism for a pneumatically operated circuit breaker said pneumatically operated circuit breaker including a first and second housing, said first housing being removably connected to said second housing, said first housing carrying a first contact, said second housing carrying a second contact movable between an engaged and disengaged position with respect to said first contact when said first housing is connected to said second housing, a pneumatic operating means for moving and maintaining said second contact out of engagement with respect to said first contact, a source of air under pressure, connections from such source to said pneumatic operating means and to said first housing, a valve in said connection to said pneumatic operating means, latch means engageable with said movable contact and movable to a latching position to latch said movable contact in said disengaged position, and means operatively connected to said latch means and responsive to a predetermined pressure condition in said compressed air source to move said latch means to latching position upon the drop of pressure in said first housing below a predetermined pressure and to move said latch means to unlatching position upon a rise of pressure in said first housing above
  • a latch mechanism for a pneumatically operated circuit breaker said pneumatically operated circuit breaker including a first and second housing, said first housing being removably connected to said second housing, said first housing carrying a first contact, said second housing carrying a second contact movable between an engaged and disengaged position with respect to said first contact when said first housing is connected to said second housing, a pneumatic operating means for moving and maintaining said second contact out of engagement with respect to said first contact, a source of air under pressure, connections from such source to said pneumatic operating means and to said first housing, a valve in said connection to said pneumatic operating means, latch means engageable with said movable contact and movable to a latching position to latch said movable contact in said disengaged position, and means operatively connected to said latch means and responsive to a predetermined pressure condition in said compressed air source to move said latch means to latching position upon the drop of pressure in said first housing below a predetermined pressure and to move said latch means to unlatching position upon a rise of pressure in said first housing above
  • a latch mechanism for a pneumatically operated circuit breaker said pneumatically operated circuit breaker including a first and second housing, said first housing being removably connected to said second housing, said first housing carrying a first contact, said second housing carrying a second contact movable between an engaged and disengaged position with respect to said first contact when said first housing is connected to said second housing, a pneumatic operating means for moving and maintaining said second contact out of engagement with respect to said first contact, a source of air under pressure, connections from such source to said pneumatic operating means and to said first housing, a valve in said connection to said pneumatic operating means, latch means engageable with said movable contact and movable to a latching position to latch said movable contact in said disengaged position, and means operatively connected to said latch means and responsive to a predetermined pressure condition in said compressed air source to move said latch means to latching position upon the drop of pressure in said first housing below a predetermined pressure and to move said latch means to unlatching position upon a rise of pressure in said first housing above
  • a first operating means for moving said relatively movable contact into engagement with respect to said relatively stationary contact and a second operating means for moving said relatively movable contact to a disengaged position with respect to said relatively stationary contact
  • said second operating means comprising a piston means operatively connected to said relatively movable contact and pneumatic pressure means for moving said piston, a source of air under pressure, connections from said source to said pneumatic pressure means, a valve in said connection to said pneumatic pressure means, a latch mechanism operatively engageable with said movable contact, said latch mechanism being movable to a latching position to latch said relatively movable contact in said disengaged position, said latch mechanism being operable responsive to variations in the pressure of said pneumatic pressure means to move the latch mechanism to latching position upon the drop of pressure in said compressed air source below a pre-determined air pressure and to move the latch mechanism to
  • a first operating means for moving said relatively movable contact into engagement with respect to said relatively stationary contact and a second operating means for moving said relatively movable contact to a disengaged position with respect to said relatively stationary contact
  • said second operating means comprising a piston means operatively connected to said relatively movable contact and pneumatic pressure means for moving said piston, a source of air under pressure, connections from said source to said pneumatic pressure means, a valve in said connection to said pneumatic pressure means, a latch mechanism operatively engageable with said movable contact, said latch mechanism being movable to a latching position to latch said relatively movable contact in said disengaged position, said latch mechanism being operable responsive to variations in the pressure of said pneumatic pressure means to move the latch mechanism to latching position upon the drop of pressure in said compressed air source below a predetermined air pressure and to move the latch mechanism to un
  • a first operating means for moving said relatively movable contact into engagement with respect to said relatively stationary contact and a second operating means for moving said relatively movable contact to a disengaged position with respect to said relatively stationary contact
  • said second operating means comprising -a piston means operatively connected to said relatively movable contact and pneumatic pressure means for moving said piston, a source of air under pressure, connections from said source to said pneumatic pressure means, a valve in said connection to said pneumatic pressure means, a latch mechanism operatively engageable with said movable contact, said latch mechanism being movable to a latching position to latch said relatively movable contact in said disengaged position, said latch mechanism being operable responsive to variations in the pressure of said pneumatic pressure means to move the latch mechanism to latching position upon the drop of pressure in said compressed air source below a pre-determined air pressure and to move the latch mechanism
  • a first operating means for moving said relatively movable contact into engagement with respect to said relatively stationary contact and a second operating means for moving said relatively movable contact to a disengaged position with respect to said relatively stationary contact
  • said second operating means comprising a piston means operatively connected to said relatively movable contact and pneumatic pressure means for moving said piston, a source of air under pressure, connections from said source to said pneumatic pressure means, a valve in said connection to said pneumatic pressure means, a latch mechanism operatively engageable with said movable contact, said latch mechanism being movable to a latching position to latch said relatively movable contact in said disengaged position, said latch mechanism being operable responsive to variations in the pressure of said pneumatic pressure means to move the latch mechanism to latching position upon the drop of pressure in said compressed air source below a pre-determined air pressure and to move the latch mechanism
  • a first operating means for moving said relatively movable contact into engagement with respect to said relatively stationary contact and a second operating means for moving said relatively movable contact to a disengaged position with respect to said relatively stationary contact
  • said second operating means comprising a piston means operatively connected to said relatively movable contact and pneumatic pressure means for moving said piston, a source of air under pressure, connections from said source to said pneumatic pressure means, a valve in said connection to said pneumatic pressure means, a latch mechanism operatively engageable with said movable contact, said latch mechanism being movable to a latching position to latch said relatively movable contact in said disengaged position, said latch mechanism being operable responsive to variations in the pressure of said pneumatic pressure means to move the Latch mechanism to latching position upon the drop of pressure in said compressed air source below a pre-determined air pressure and to move the latch mechanism

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US817645A 1958-06-04 1959-06-02 Latch-open mechanism for air blast circuit breaker Expired - Lifetime US3047697A (en)

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SE3047697X 1958-06-04

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3433909A (en) * 1967-08-24 1969-03-18 Nasa Separation simulator
US3816800A (en) * 1973-03-01 1974-06-11 Westinghouse Electric Corp Protective system for series capacitors
EP0250619A1 (en) * 1986-05-27 1988-01-07 Mitsubishi Denki Kabushiki Kaisha Hydraulic operating apparatus
AU599217B2 (en) * 1987-03-25 1990-07-12 Claude Alain Gratzmuller A differential hydraulic jack for the control of electric circuit-breakers
CN1797634B (zh) * 2004-12-28 2010-06-23 株式会社大亨 气体开关

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US859843A (en) * 1904-12-09 1907-07-09 Lebbeus H Rogers Controller for pneumatic compressors.
US1129878A (en) * 1913-03-11 1915-03-02 Ingersoll Rand Co Regulating device for motor-driven compressors.
DE608733C (de) * 1932-02-18 1935-01-31 Aeg Sicherheitseinrichtung zur Verhuetung des ungleichzeitigen Schaltens mehrerer durch Druckgas einzeln angetriebener, mechanisch nicht miteinander gekuppelter Schalter
GB512623A (en) * 1938-03-08 1939-09-21 Reyrolle A & Co Ltd Improvements in or relating to gas-blast electric circuit-breakers
US2660636A (en) * 1951-07-05 1953-11-24 Westinghouse Electric Corp Automatic reclosing circuit breaker
DE1005155B (de) * 1953-02-11 1957-03-28 Licentia Gmbh Hochspannungsschalter mit stroemendem Loeschmittel und mit schwenkbar angeordneten Kontakten
US2824937A (en) * 1954-12-30 1958-02-25 Westinghouse Electric Corp Circuit interrupters
US2856480A (en) * 1953-03-10 1958-10-14 Licentia Gmbh High voltage switch
US2911492A (en) * 1957-02-25 1959-11-03 Gen Electric Operating mechanism for a fluid blast circuit breaker
US2936355A (en) * 1957-06-21 1960-05-10 Ite Circuit Breaker Ltd Latch means for recirculating gas blast interrupters
US2949521A (en) * 1957-09-12 1960-08-16 Asea Ab High tension air blast circuit breaker
US2972666A (en) * 1957-06-29 1961-02-21 Asea Ab Air blast circuit breakers with breaking gaps in compressed air containers carried by insulator pillars

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US859843A (en) * 1904-12-09 1907-07-09 Lebbeus H Rogers Controller for pneumatic compressors.
US1129878A (en) * 1913-03-11 1915-03-02 Ingersoll Rand Co Regulating device for motor-driven compressors.
DE608733C (de) * 1932-02-18 1935-01-31 Aeg Sicherheitseinrichtung zur Verhuetung des ungleichzeitigen Schaltens mehrerer durch Druckgas einzeln angetriebener, mechanisch nicht miteinander gekuppelter Schalter
GB512623A (en) * 1938-03-08 1939-09-21 Reyrolle A & Co Ltd Improvements in or relating to gas-blast electric circuit-breakers
US2660636A (en) * 1951-07-05 1953-11-24 Westinghouse Electric Corp Automatic reclosing circuit breaker
DE1005155B (de) * 1953-02-11 1957-03-28 Licentia Gmbh Hochspannungsschalter mit stroemendem Loeschmittel und mit schwenkbar angeordneten Kontakten
US2856480A (en) * 1953-03-10 1958-10-14 Licentia Gmbh High voltage switch
US2824937A (en) * 1954-12-30 1958-02-25 Westinghouse Electric Corp Circuit interrupters
US2911492A (en) * 1957-02-25 1959-11-03 Gen Electric Operating mechanism for a fluid blast circuit breaker
US2936355A (en) * 1957-06-21 1960-05-10 Ite Circuit Breaker Ltd Latch means for recirculating gas blast interrupters
US2972666A (en) * 1957-06-29 1961-02-21 Asea Ab Air blast circuit breakers with breaking gaps in compressed air containers carried by insulator pillars
US2949521A (en) * 1957-09-12 1960-08-16 Asea Ab High tension air blast circuit breaker

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3433909A (en) * 1967-08-24 1969-03-18 Nasa Separation simulator
US3816800A (en) * 1973-03-01 1974-06-11 Westinghouse Electric Corp Protective system for series capacitors
EP0250619A1 (en) * 1986-05-27 1988-01-07 Mitsubishi Denki Kabushiki Kaisha Hydraulic operating apparatus
US4785712A (en) * 1986-05-27 1988-11-22 Mitsubishi Denki Kabushiki Kaisha Hydraulic operating apparatus for electric circuit breaker
AU599217B2 (en) * 1987-03-25 1990-07-12 Claude Alain Gratzmuller A differential hydraulic jack for the control of electric circuit-breakers
CN1797634B (zh) * 2004-12-28 2010-06-23 株式会社大亨 气体开关

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Publication number Publication date
DE1070266B (hu)

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