US2855487A - Oil circuit breaker with two extinguishing chambers - Google Patents

Oil circuit breaker with two extinguishing chambers Download PDF

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Publication number
US2855487A
US2855487A US571281A US57128156A US2855487A US 2855487 A US2855487 A US 2855487A US 571281 A US571281 A US 571281A US 57128156 A US57128156 A US 57128156A US 2855487 A US2855487 A US 2855487A
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US
United States
Prior art keywords
contact
cylinder
extinguishing
piston
tubular
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
US571281A
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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.)
ABB Norden Holding AB
Original Assignee
ASEA AB
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 ASEA AB filed Critical ASEA AB
Application granted granted Critical
Publication of US2855487A publication Critical patent/US2855487A/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
    • H01H33/92—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 liquid, e.g. oil

Definitions

  • the present invention relates to a conventional high tension oil circuit breaker with two extinguishable chambers, which are arranged to be connected in series by the movablecontacts and a contact bridge carrying said contacts.
  • An important feature of the invention is that one of the said extinguishing chambers, which is intended for heavy currents, is constructed in a known manner and preferably consists of an extinguishing chamber containing a differential piston actuated by the gas generated by the arc.
  • the extinguishing chamber intended for low currents on the other hand, has a hollow movable contact carried by a tubular member, which is connected to a piston movably arranged in a cylinder, said piston tending to lower the fluid pressure in said cylinder during the first part of the contact movement.
  • a piston movably arranged in a cylinder
  • an extinguishing oil stream passes between the contacts and into the cylinder through the opening in the hollow movable contact from the space where the stationary contact is arranged.
  • This last mentioned space is in communication with an oil-filled space outside the extinguishing chamber.
  • the cylinder, containing the piston, is also through the opening in the movable contact, in communication with the space outside the cylinder through a number of openings provided with check-valves, and through which openings the oil in the cylinder can be quickly, and with low resistance, pressed out by closing the breaker.
  • the piston that lowers the fluid pressure may be actuated by a spring in the opening direction, so that the operating force when opening the breaking gap will be low. The spring is then tensioned during the closing of the breaker.
  • the oil current may be maintained during a desired time period.
  • the accompanying drawing illustrates one embodiment of the invention having a conventional extinguishing chamber 1 of the type containing a difierential piston.
  • This chamber is designed for heavy currents and is by means of a bridge member 3, which is fixed to the operating rod 2, connected in series with an extinguishing chamber for low currents.
  • the member 3 carries the movable contact 4 of the chamber 1 as well as the movable contact of the extinguishing chamber connected in series therewith.
  • the breaking gap 5 has a stationary contact 17 which is formed as a rod and is fixed on the insulator 18.
  • a tubular member 19 of insulating material surrounds the contact 17, and is also attached to the said insulator.
  • the cylinder 10 is attached to the lower end of the member 19.
  • the space 15 around the contact 17 is in communication with the space outside the extinguishing .chamber through openings 16.
  • the movable contact of the breaking gap can slide along the stationary contact and consists of a number of spring actuated contact segments 6, which are arranged at the upper end of a tube 7, which tube at its lower end is attached to a piston 8.
  • the movable contact 6 and the piston 8 are carried by a rod 9 attached to the bridge member 3.
  • the tube 7 extends through an opening in the wall 11 in the cylinder. Openings 14 in said wall 11 are provided with checkvalves 13 and allow the oil in the space 12 to escape, when the piston 8 is moving upwardly.
  • the extinguishing chamber for low currents operates as follows: At breaking, the piston 8 and the movable contact move downwardly. During the first part of this downward movement the movable contact 6 slides along the stationary contact 17, which projects into the tube 7.
  • An oil circuit breaker comprising two are extinguishing units each having a movable contact, a common conducting bridge member electrically connecting the said units in series, one of the said units being designed to interrupt high currents and to open before the other unit which is designed to interrupt low currents, the last mentioned unit comprising a stationary contact, a cylinder arranged at the outer end of said contact, an annular movable contact slidable along said stationary contact, an end wall in said cylinder, a tubular member carrying said movable contact and passing through the said end wall, a piston movable in said cylinder and attached to said tubular member, said end wall and piston forming a fluid space, located between the cylinder and the annular member, said piston tending to lower the fluid pressure in the cylinder during its movement away from the stationary contact, and the said fluid space in said cylinder being in communication with the exterior of the cylinder through the said movable contact only during the last part of the I contact movement and in the open interrupting position.
  • a cylinder end wall having an opening for the passage of the tubular contact, an annular fluid space being formed between the said cylinder and the tubular contact and between said piston and the said end wall, openings providing communication between the interior of the tubular contact and the said annular fluid space, so that the fluid pressure in the cylinder is reduced as the tubular contact is withdrawn from the fixed contact and is moved toward the open position of the contacts, in combination with an arc extinguishing unit for high currents, comprising a casing and a movable contact, and a bridge member so connecting the movable contacts of the two are extinguishing units for high and low current that said units are electrically connected in series with each other.
  • An oil circuit breaker having an arc extinguishing unit for low currents, comprising a fixed contact, a movable tubular contact adapted to slide over the fixed contact, a piston secured to the tubular contact, a cylinder surrounding the tubular contact and within which the said piston operates, a cylinder end wall having an opening for the passage of the tubular contact, an annular fluid space being formed between the said cylinder and the tubular contact and between said piston and the said end wall, openings providing communication between the interior of the tubular contact and the said annular fluid space, so that the fluid pressure in the cylinder is reduced as the tubular contact is withdrawn from the fixed contact and is moved toward the open position of the contacts, an insulating tubular member surrounding the fixed contact with an annular space therein for the accommodation of the tubular contact, and means whereby the said cylinder is supported from the lower end of said insulating member, in combination with an arc extinguishing unit for high currents, comprising a casing and a movable Contact, and a bridge member
  • An oil circuit breaker having an arc extinguishing unit for low currents, comprising a fixed contact, a movable tubular contact adapted to slide over the fixed contact, a piston secured to the tubular contact, a cylinder surrounding the tubular contact and within which the said piston operates, a cylinder end wall having an opening for the passage of the tubular contact, an annular fluid space being formed between the said cylinder and the tubular contact and between said piston and the said end wall, openings providing communication between the interior of the tubular contact and the said annular fluid space, so that the fluid pressure in the cylinder is reduced as the tubular contact is withdrawn from the fixed contact and is moved toward the open position of the contacts, and check valves in the said cylinder end Wall to permit the escape of fluid from the said annular fluid space between the piston and the said wall when the movable contact is moved upwardly onto the fixed contact, in combination with an arc extinguishing unit for high currents, comprising a casing and a movable Contact, and a bridge member so connecting

Landscapes

  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Circuit Breakers (AREA)
  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
US571281A 1955-03-14 1956-03-13 Oil circuit breaker with two extinguishing chambers Expired - Lifetime US2855487A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE784045X 1955-03-14

Publications (1)

Publication Number Publication Date
US2855487A true US2855487A (en) 1958-10-07

Family

ID=20336781

Family Applications (1)

Application Number Title Priority Date Filing Date
US571281A Expired - Lifetime US2855487A (en) 1955-03-14 1956-03-13 Oil circuit breaker with two extinguishing chambers

Country Status (4)

Country Link
US (1) US2855487A (de)
DE (1) DE1026397B (de)
FR (1) FR1143381A (de)
GB (1) GB784045A (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR741488A (fr) * 1931-09-01 1933-02-13 Acec Interrupteur électrique
US2235901A (en) * 1936-11-14 1941-03-25 Asea Ab Electric circuit breaker
US2252983A (en) * 1938-02-09 1941-08-19 Allen M Rossman Electric circuit breaker
US2463029A (en) * 1946-10-30 1949-03-01 Westinghouse Electric Corp Circuit interrupter
US2551772A (en) * 1946-05-21 1951-05-08 Forges Ateliers Const Electr High-tension interrupting device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR807454A (fr) * 1935-06-24 1937-01-13 Gen Electric Co Ltd Interrupteur électrique à pots d'explosion
BE429490A (de) * 1937-08-12
DE724569C (de) * 1938-11-02 1942-08-29 Studiengesellschaft Fuer Hochl Loeschkammerschalter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR741488A (fr) * 1931-09-01 1933-02-13 Acec Interrupteur électrique
US2235901A (en) * 1936-11-14 1941-03-25 Asea Ab Electric circuit breaker
US2252983A (en) * 1938-02-09 1941-08-19 Allen M Rossman Electric circuit breaker
US2551772A (en) * 1946-05-21 1951-05-08 Forges Ateliers Const Electr High-tension interrupting device
US2463029A (en) * 1946-10-30 1949-03-01 Westinghouse Electric Corp Circuit interrupter

Also Published As

Publication number Publication date
FR1143381A (fr) 1957-09-30
GB784045A (en) 1957-10-02
DE1026397B (de) 1958-03-20

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