US3054877A - Compressed air actuated electric switch with power switching contacts and voltage disconnecting contacts - Google Patents

Compressed air actuated electric switch with power switching contacts and voltage disconnecting contacts Download PDF

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Publication number
US3054877A
US3054877A US740153A US74015358A US3054877A US 3054877 A US3054877 A US 3054877A US 740153 A US740153 A US 740153A US 74015358 A US74015358 A US 74015358A US 3054877 A US3054877 A US 3054877A
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US
United States
Prior art keywords
contacts
compressed air
power switching
voltage disconnecting
valve
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
US740153A
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English (en)
Inventor
Thommen Hans
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 US3054877A publication Critical patent/US3054877A/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
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/12—Auxiliary contacts on to which the arc is transferred from the main contacts
    • H01H33/121—Load break switches

Definitions

  • the present invention relates to electric switches and more particularly to switches of the air blast type provided with power switching contacts and voltage disconnecting contacts which are blasted with compressed air in order to assist in the extinction of the are drawn between the contacts upon their separation.
  • the above structural simplifications can be further simplified by using the exhaust air from the power switching contacts to act upon elements for the voltage disconnecting contacts.
  • this objective is achieved by arranging a valve in the exhaust duct of the power switching contacts, such valve serving as an exhaust valve for the power switching contacts and as a valve for introducing the exhaust air after leaving the power switching contacts to auxiliary pneumatic operating means such as a pneumatic motor of the piston and cylinder type, the piston of which is mechanically connected to a movable one of the voltage disconnecting contacts to disengage the same from the other, stationary contact.
  • the view is principally a vertical longitudinal section with certain parts shown in elevation of one embodiment of the invention wherein compressed air from a supply tank is used to move the contacts of the voltage disconnecting switch component to closed position, wherein a valve in the exhaust duct of the power switching contacts performs a second valve function in conjunction with the voltage disconnecting contacts, namely, to cause their separation, and wherein compressed air stored in the chamber containing the voltage disconnecting contacts is caused to flow, subsequent to opening of the power switching contacts, over the disengaged voltage disconnecting contacts into the supply tank.
  • the switch structure comprises a tank 1 containing compressed air.
  • a tubular insulator column 2 Within which are arranged the power switching contacts comprising a movable pin contact member 3a and a stationary nozzle contact member 3b.
  • metallic section 4 Mounted atop the insulator column 2 is metallic section 4 which provides an outlet 4a for compressed air discharged upward through the nozzle contact member 3b.
  • a dual purpose valve 6 is disposed within the metallic section 4 and it is constituted by one valve closure member 6a which serves to close the upper end of the nozzle contact member 3b and a second valve closure member 6b which serves to close an outlet 4b from the section 4 into a cylinder 7 3,054,877 Patented Sept.
  • Cylinder 7 contains a piston 8 which is structually united with the movable contact member 9a of the voltage disconnecting contacts, and which is adapted to engage and be disengaged from the stationary contact member 9b of the voltage disconnecting contacts as the piston 8 is shifted back and forth in its cylinder 7.
  • cylinder 7 and piston 3 constitute a double action pneumatic motor.
  • the voltage disconnecting contacts 9a, 9b are enclosed within a tubular insulator casing 10 which constitutes a longitudinal extension of cylinder 7.
  • the left end portion of cylinder 7 is arranged to communicate with the interior of the compressed air tank 1 by means of a tubular column 11 of insulating material which is arranged parallel with the upstanding insulator column 2.
  • a valve 12 located at the lower end of the column 11 within tank 1 is so arranged that in one position of the valve, the interior of column 11, and hence the left end of cylinder 7, is placed in communication with the interior of tank 1 and thus permits the compressed air to flow upward through column 11 and into the left end of cylinder 7.
  • the lower end of column 11 is cut ofii from the compressed air in tank 1 and placed in communication with a discharge outlet pipe 13 which passes through to the outside of tank 1.
  • a discharge outlet pipe 13 which passes through to the outside of tank 1.
  • the switch is shown with the main power switching contacts 311, 3b closed and the voltage switching contacts 9a, 9b open.
  • the power switching contacts 3a, 3b being arranged in series with the voltage disconnecting contacts 9a, 9b, valve 12 is moved to the position which admits compressed air from tank 1 upwardly through tubular column 11 into cylinder 7 at the left side of piston "8 thus causing piston 8 and the movable voltage disconnecting contact member 9a to move to the right and engage the stationary contact member 912.
  • an electrical switch of the air-blast type comprising a power switching assembly including a set of power switching contacts enclosed within a first hollow insulator, a voltage disconnecting assembly including a set of voltage disconnecting contacts enclosed within a second hollow insulator and connected electrically in series with said set of power switching contacts in relation to a line to be connected through said switch, means for introducing compressed air into said first hollow insulator for efiecting separation of said set of power switching contacts, a pneumatic motor separated from said second hollow insulator and having a movable element thereof mechanically coupled to a movable one of said voltage disconnecting contacts, and valve means arranged cooperatively with an outlet for compressed air exhausted from said first hollow insulator and with an inlet to said pneumatic motor for actuating the latter by said exhausted compressed air thereby to effect separation of said voltage disconnecting contacts.
  • valve means is constituted by two commonly operated valve elements, one of said valve elements controlling the outlet from said first hollow insulator and the other of said valve elements controlling the inlet to said cylinder of said pneumatic motor.
  • said pneumatic motor comprises a stationary cylinder and a piston slidable therein and which is connected to said movable voltage disconnecting contact, the compressed air exhausted from said first hollow insulator being led through said valve means to one side of said piston to cause the latter to move in one direction so as to disengage said voltage disconnecting contacts, and which further includes means for introducing compressed air to the other side of said piston to cause the latter to move in the opposite direction so as to reengage said voltage disconnecting contacts.
  • a power switching assembly includ' ing a set of relatively movable power switching contacts enclosed within a first hollow insulator
  • a voltage disconnecting assembly including a set of relatively movable voltage disconnecting contacts enclosed within a second hollow insulator and connected electrically in series with said set of power switching contacts in relation to a line to be connected through said switch, means for introducing compressed air into said first hollow insulator for effecting separation of said set of power switching contacts
  • a double action pneumatic motor comprising a stationary cylinder and a piston slidable therein and which is connected to a movable one of said voltage disconnecting contacts, said piston being provided with ports therethrough, wall means including non-return valve means therein separating a first interior portion of said pneumatic motor cylinder at one side of said piston from said second hollow insulator, said non-return valve means opening in the direction of said second hollow insulator, valve means arranged cooperatively with an outlet for compressed air exhausted from said first hollow insulator

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  • Circuit Breakers (AREA)
US740153A 1957-06-07 1958-06-05 Compressed air actuated electric switch with power switching contacts and voltage disconnecting contacts Expired - Lifetime US3054877A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH3054877X 1957-06-07

Publications (1)

Publication Number Publication Date
US3054877A true US3054877A (en) 1962-09-18

Family

ID=4573742

Family Applications (1)

Application Number Title Priority Date Filing Date
US740153A Expired - Lifetime US3054877A (en) 1957-06-07 1958-06-05 Compressed air actuated electric switch with power switching contacts and voltage disconnecting contacts

Country Status (5)

Country Link
US (1) US3054877A (xx)
BE (1) BE568382A (xx)
CH (1) CH352728A (xx)
DE (1) DE1042715B (xx)
FR (1) FR1196689A (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3440379A (en) * 1965-09-06 1969-04-22 Bbc Brown Boveri & Cie Gas-blast circuit breaker with multiple interruption

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH373445A (de) * 1958-11-24 1963-11-30 Asea Ab Druckluftschalter mit Leistungsschaltstelle und Hilfsschaltstelle
CH372721A (de) * 1959-06-13 1963-10-31 Bbc Brown Boveri & Cie Druckluftschalter mit Mehrfachunterbrechung
DE1163940B (de) * 1960-02-25 1964-02-27 Asea Ab Druckluftschalter mit reihengeschalteter Trennstelle in einer Durchfuehrung
CH386530A (de) * 1960-09-07 1965-01-15 Asea Ab Druckluftschalter mit einem auf Hochspannungspotential angeordneten, ständig mit Druckluft gefüllten Behälter
DE3441998A1 (de) * 1984-06-20 1986-01-02 Hruska S.r.l., Rom Im mund schweissbare, dentale kronen, bruecken und lamellenfoermige verbindungselemente aus einer titanlegierung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1904577A (en) * 1930-04-04 1933-04-18 Gen Electric Gas blast circuit interrupter
US2345724A (en) * 1942-03-19 1944-04-04 Westinghouse Electric & Mfg Co Circuit breaker
GB581236A (en) * 1943-09-04 1946-10-04 Bbc Brown Boveri & Cie Improvements in or relating to gas blast multi-break electric circuit breakers
US2453555A (en) * 1943-09-11 1948-11-09 Bbc Brown Boveri & Cie Gas blast circuit breaker
DE933819C (de) * 1953-10-23 1955-10-06 Liebknecht Transformat Anordnung zum Abschalten der Schutzwiderstaende von Hochspannungsschaltern mit Druckgasantrieb

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE893828C (de) * 1943-08-29 1953-10-19 Aeg Elektrischer Stromunterbrecher, insbesondere Schalter, mit Lichtbogenloeschung durch ein stroemendes Druckmittel
DE919655C (de) * 1951-10-09 1954-11-02 Licentia Gmbh Elektrischer Hochspannungsschalter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1904577A (en) * 1930-04-04 1933-04-18 Gen Electric Gas blast circuit interrupter
US2345724A (en) * 1942-03-19 1944-04-04 Westinghouse Electric & Mfg Co Circuit breaker
GB581236A (en) * 1943-09-04 1946-10-04 Bbc Brown Boveri & Cie Improvements in or relating to gas blast multi-break electric circuit breakers
US2453555A (en) * 1943-09-11 1948-11-09 Bbc Brown Boveri & Cie Gas blast circuit breaker
DE933819C (de) * 1953-10-23 1955-10-06 Liebknecht Transformat Anordnung zum Abschalten der Schutzwiderstaende von Hochspannungsschaltern mit Druckgasantrieb

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3440379A (en) * 1965-09-06 1969-04-22 Bbc Brown Boveri & Cie Gas-blast circuit breaker with multiple interruption

Also Published As

Publication number Publication date
FR1196689A (fr) 1959-11-25
DE1042715B (de) 1958-11-06
BE568382A (xx)
CH352728A (de) 1961-03-15

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