US2948791A - Extinguishing chamber in oil circuit breakers for medium voltages - Google Patents

Extinguishing chamber in oil circuit breakers for medium voltages Download PDF

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Publication number
US2948791A
US2948791A US740131A US74013158A US2948791A US 2948791 A US2948791 A US 2948791A US 740131 A US740131 A US 740131A US 74013158 A US74013158 A US 74013158A US 2948791 A US2948791 A US 2948791A
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US
United States
Prior art keywords
oil
space
extinguishing chamber
gas
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
US740131A
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English (en)
Inventor
Jonasson Sven
Pucher Walter
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ABB Norden Holding AB
Original Assignee
ASEA AB
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Filing date
Publication date
Application filed by ASEA AB filed Critical ASEA AB
Application granted granted Critical
Publication of US2948791A publication Critical patent/US2948791A/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
    • H01H33/72—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid having stationary parts for directing the flow of arc-extinguishing fluid, e.g. arc-extinguishing chamber
    • H01H33/75—Liquid-break switches, e.g. oil-break

Definitions

  • the present invention concerns an extinguishing chamber for oil circuit breakers in which a piston coupled with the movable contact as well as a differential piston achieving an oil stream against the arc are dispensed with. It is, however, provided with a space closed at the top which in its upper part contains gas and in its lower part oil. Differing from known circuit breakers, the said enclosed space, at its lower part is by wide openings or channels, in permanent communication with a space in which the movable contact of the breaking gap is enclosed.
  • the extinguishing chamber is provided with a.
  • an oil container at the upper part of the cylinder and the said annular space communicates with the oil magazine through one or a plurality of openings in the wall of the sleeve.
  • the entire extinguishing chamber is plunged into an oil container, so that the oil reaches a little over the oil level in the oil container.
  • the extinguishing chamber contains only one movable member, i.e. a pinshaped movable contact, and an arc extinguishing gas and oil stream is achieved without using differential pistons or pump pistons coupled to the contact pin.
  • a pinshaped movable contact i.e. a pinshaped movable contact
  • an arc extinguishing gas and oil stream is achieved without using differential pistons or pump pistons coupled to the contact pin.
  • Patented Aug. 9, 1960 are further no valves for controlling the flow of the extinguishing medium.
  • the properties of the extinguishing chamber can be changed within wide limits by changing the gas volume above the annularily formed oil column between said cylinder and the sleeve surrounding the movable contact.
  • FIG. 1 shows a vertical section through an extinguishing chamber
  • Fig. 2 a section through the extinguishing chamber along the line AA in Fig. 1.
  • 1 designates a cylinder of insulating material and 2 a' bottom rigidly joined with said cylinder and carrying the stationary contact 3 of the breaking gap.
  • the cylinder 1 is at its upper part rigidly joined with a cover 4,which simultaneously forms the bottom in a container 5.
  • the cover 4 is also provided with an annu larily shaped guiding member, 6, in which there are openings 7 and an opening 8.
  • the movable contact 9 of the breaking gap traversing the opening 8 in the guiding member 6 is surrounded by an insulating sleeve 10, which at the upper end is attached to the cover 4 and at the lower end is provided with a nozzle 11, through which the movable contact traverses and which it substantially closes, and with guiding members 12 fixing its position in relation to the cylinder 1.
  • the space 13 between the movable contact 9 and the sleeve 10 communicates through openings 7 in the guiding member 6 with the space 14 in the container 5, which space constitutes the oil magazine.
  • the annularily formed space 15 is at the upper end closed by the cover 4. This space communicates through the openings 16 between the guiding members 12 with the space 17, in which the stationary contact 3 is located, and through the channel 18 in the wall of the sleeve 10, the space 13 and the openings 7 with the space 14, which is partly filled with oil.
  • the space 15 contains in its upper part gas and in its lower part oil. The oil level and thus the gas volume is determined by'the position of the opening 18.
  • the movable contact is by means of a link 19 articulated to a lever 20, which is journalled in the consoles 22 on the housing 5. This lever 20 is by means of the rod 21 articulated to an operating mechanism, not shown on the figures.
  • the circuit breaker works in the following way.
  • an arc generating gas is obtained, which gas forms a bubble around the breaking gap.
  • This gas bubble removes part of the oil from the space 17.
  • the removed oil and possibly part of the generated gas streams through the openings 16 into the space 15 and moves in front of it the annular oil column in the lower part of this space like a piston.
  • the gas in the upper part of the space 15 will then be compressed.
  • the movable contact 9, on its way upwards, has passed the nozzle 11 in the lower part of the sleeve 10 the gas compressed around the breaking gap will escape through the nozzle and force the oil column in the space 13 to the space 14.
  • the gas When the gas can no longer flow out, it is compressed, and the flow of oil will end when ber may be located in an oil tank in such a way that the upper part of the cylinder 1 will be located somewhat below the oil level.
  • the opening 18 is suitably arranged in the wall of the cylinder.
  • An oil circuit breaker comprising a container with a chamber in the bottom thereof, a cover for the container, a stationary contact arranged inside the said chamber, a cooperating vertically movable contact, an insulating sleeve surrounding said movable contact and attached at its upper part to the cover of the container, an oil magazine, at least one oil opening in the said cover providing communication between the said oil magazine and the interior of the said sleeve, a nozzle which is substantially closed by the movable contact as it approaches the stationary contact, said nozzle being arranged in the lower part of the said sleeve, an annular space being formed by said sleeve and by said container and cover and said space being closed at its top but being in permanent communication with the said chamber at the bottom of the container and in permanent communication with the said oil magazine and an oil opening arranged-in the wall of the said sleeve in spaced relation to the'said cover and serving to determine the level of the oil in the said annular space.

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  • Circuit Breakers (AREA)
US740131A 1957-06-06 1958-06-05 Extinguishing chamber in oil circuit breakers for medium voltages Expired - Lifetime US2948791A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE358143X 1957-06-06

Publications (1)

Publication Number Publication Date
US2948791A true US2948791A (en) 1960-08-09

Family

ID=20308849

Family Applications (1)

Application Number Title Priority Date Filing Date
US740131A Expired - Lifetime US2948791A (en) 1957-06-06 1958-06-05 Extinguishing chamber in oil circuit breakers for medium voltages

Country Status (5)

Country Link
US (1) US2948791A (de)
CH (1) CH358143A (de)
DE (1) DE1125030B (de)
FR (1) FR1196647A (de)
GB (1) GB829397A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3100248A (en) * 1959-09-09 1963-08-06 Asea Ab Oil circuit breaker
US3166659A (en) * 1959-12-16 1965-01-19 Asea Ab Oil circuit breaker comprising an extinguishing chamber for high voltages

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR768278A (fr) * 1933-02-17 1934-08-03 Siemens Ag Interrupteur à liquide, en particulier interrupteur à détente
GB471300A (en) * 1936-01-02 1937-09-01 Asea Ab Improvements in electric circuit breakers having arc quenching arrangements
US2387589A (en) * 1937-07-19 1945-10-23 Kesselring Fritz Circuit breaker
FR1050715A (fr) * 1951-02-16 1954-01-11 D App Electr Sprecher & Schuh Interrupteur à chambre d'extinction avec électrode auxiliaire

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH115197A (de) * 1925-07-27 1926-06-01 Oerlikon Maschf Olschalter.
DE662830C (de) * 1935-05-22 1938-07-22 Sachsenwerk Licht & Kraft Ag Loeschkammer fuer Fluessigkeitsschalter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR768278A (fr) * 1933-02-17 1934-08-03 Siemens Ag Interrupteur à liquide, en particulier interrupteur à détente
GB471300A (en) * 1936-01-02 1937-09-01 Asea Ab Improvements in electric circuit breakers having arc quenching arrangements
US2387589A (en) * 1937-07-19 1945-10-23 Kesselring Fritz Circuit breaker
FR1050715A (fr) * 1951-02-16 1954-01-11 D App Electr Sprecher & Schuh Interrupteur à chambre d'extinction avec électrode auxiliaire

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3100248A (en) * 1959-09-09 1963-08-06 Asea Ab Oil circuit breaker
US3166659A (en) * 1959-12-16 1965-01-19 Asea Ab Oil circuit breaker comprising an extinguishing chamber for high voltages

Also Published As

Publication number Publication date
FR1196647A (fr) 1959-11-25
CH358143A (de) 1961-11-15
GB829397A (en) 1960-03-02
DE1125030B (de) 1962-03-08

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