US2282268A - Electric circuit breaker - Google Patents

Electric circuit breaker Download PDF

Info

Publication number
US2282268A
US2282268A US317946A US31794640A US2282268A US 2282268 A US2282268 A US 2282268A US 317946 A US317946 A US 317946A US 31794640 A US31794640 A US 31794640A US 2282268 A US2282268 A US 2282268A
Authority
US
United States
Prior art keywords
circuit breaker
cylinder
air
pressure
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
US317946A
Other languages
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
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 US2282268A publication Critical patent/US2282268A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H01H33/28—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

Definitions

  • This invention relates to electrical circuit breakers and particularly to heavy duty switching systems including a circuit breaker and a disconnect switch that are operated, in proper sequence, by air under pressure and in which an air blast passes over or between the circuit breaker contacts to extinguish the arc.
  • An object for the present invention is to provide an electric circuit breaker having contacts of such design that the entire rated current may be carried by the circuit breaker, an air cylinder and piston for holding the contacts in engagement under such pressure that the load current is carried without undue heating, and valve mechanism for supplying air under pressure to the other end of the cylinder to open the contacts.
  • An object is to provide a circuit breaker of the type stated in which the contacts take the form of a fixed annular or nozzle contact and a movable blade or plunger contact which seats upon the nozzle contact when the circuit breaker is closed, the contacts being located in a chamber that is normally under atmospheric pressure and in communication with that end of the cylinder to which pressure air is supplied to open the circuit breaker, and the valve mechanism includes a valve operable upon the introduction of pressure air into the chamber to vent the opposite end of the cylinder to atmosphere.
  • the grounded supporting frame I of the circuit breaker system carries a tanki2 in which compressed air is stored, a main blow or control valve 3 for controlling the flow of the pressure air to the operating mechanism, and hollow insulators 4, 5 that support the circuit breaker.
  • the blow valve is actuated in the usual manner, for example by a piston 3a to which pressure air is admitted by a pilot valve 3b.
  • the casting or body member 6 which is carried by the insulator 5 has an air passage 1 that extends from the hollow insulator 4 to the upper surface of the casting.
  • An air chamber is formed above the casting 6 by an insulating cylinder 8 that carries a hollow casting 9 that constitutes one terminal of the circuit breaker.
  • a contact ID on the terminal casting 9 has the form of 'a nozzle which presents a round surface for engagement by the domed contact I I on the upper end of the switch blade or plunger I2.
  • the plunger I2 extends through the body member 6 and has a flange or piston I3 that slides in a cylinder I4 in the lower portion of the member 6.
  • a port I5 connectsthe upper end of the cylinder I4 to the air passage 1, and a vent at the lower end of the cylinder is controlled by a valve I6 that is slidable in the member 6 and carries a piston I! that is normally held in raised or vent-closing position by a spring I8.
  • the valve l6 and piston I1 are both acted upon by the pressure within the lower end of the cylinder, and the valve assembly is therefore balanced or approximately balanced against this pressure but not against pressure exerted on the upper face of piston I1.
  • the lower end of the cylinder is closed by a casting l9 that is carried by the insulator 5, and a passage 20 extends through the casting I9 to supply pressure air to the lower face of the piston I3.
  • is inserted in the passage 20 to limit the flow of air when the vent valve I6 is open.
  • the lower end of the circuit breaker blade 12 has leaf contacts 22 for engagement by the disconnect switch blade 23 that is pivotally supported on the insulator 24 and moved to open position by link 25 and a pressure cylinder 25' after the circuit breaker is opened.
  • a strap 26 on insulator 24 serves as the second terminal for the switch assembly.
  • the parts are illustrated in their normal closed positions and the circuit extends from terminal strap 26 and the disconnect switch 23, 22, through the circuit breaker blade l2, contacts I! and ii. to the other terminal 0.
  • the upper end of the cylinder is at low or atmospheric pressure and the contacts II, II are held in engagement by pressure air that enters the lower end of the cylinder I through the passage Ill and hollow insulator I.
  • the rounded surfaces of the contacts restrict the contacting area to approximately a line and the high pressure engagement affords a low resistance contact capable of carrying heavy currents without undue heating.
  • the main valve 3 is actuated to admit high pressure air to passage 1 when the circuit breaker is to be opened.
  • the high pressure air passes to the upper end of the cylinder it through the port II and also acts on the small piston I! to open the vent valve It.
  • the piston I8 is forced downwardly to separate contact II from the fixed contact II, and the arc is extinguished by the blast of air that passes over the tip of contact H to escape through the nozzle contact Ill.
  • restricts the fiow of air to the lower face of piston l3 and a rapid opening of the circuit breaker is obtained whether or not a valve is employed to close the passage 20.
  • the disconnect switch 23 is preferably opened automatically in timed relation to the opening of the circuit breaker but the mechanisms for this operation are not-shown as they form no part of the present invention.
  • the disconnect switch is of course closed again before valve 3 is adjusted to vent the pressure air from the upper end of the cylinder and the chamber which encloses the contacts.
  • the mechanism for operating the disconnect switch may comprise pipes 21, 28 for admitting pressure air to the opposite ends of the cylinder 25; the pipe 21 leading to the low pressure side of the blow valve 8 and the fiow through pipe 2! being controlled by a valve 20.
  • a circuit breaker comprising means defining an arc-extinguishing chamber, a nozzle contact carried by one wall of the chamber, a sliding member having a domed contact for seating against said nozzle contact, a cylinder and piston supporting said sliding member for movement axially of the chamber, means for continuously admitting air to one end of the cylinder to displace said piston to hold said domed contact in firm engagement with said nozzle contact, a port connecting the other end of the cylinder to said chamber, means responsive to pressure within said chamber to vent the first end of the cylinder, and valve means for admitting pressure air to said chamber.
  • venting means comprises a second piston slidable in a wall of said chamber, and a vent valve carried by said second piston, the pressure within the chamber being exerted on the outer face of the second piston and the pressure within the first end of the cylinder being applied in opposite directions to said second piston and valve.
  • a circuit breaker comprising areciprocating blade member, a piston carrying said member and movable in a cylinder, a tank for storing air under pressure, a contact on one end of the blade member, a fixed contact in line with said blade member contact, a permanently open air vpassage connecting said tank to the end of said cylinder opposite said contacts, means in said passage restricting the-flow of air therethrough, valve means and a second passage for supplying pressure air from the tank to the other end of the cylinder, and pressure-responsive vent means operable by pressure air admitted to said other end of the cylinder to vent to atmosphere the first end of the cylinder.
  • a circuit breaker adapted to cary heavy currents comprising a body structure including a cylinder, a sliding member extending through operable by pressure air in the chamber for vent-

Landscapes

  • Circuit Breakers (AREA)
  • Gas-Insulated Switchgears (AREA)
  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
US317946A 1938-05-06 1940-02-08 Electric circuit breaker Expired - Lifetime US2282268A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE209746X 1938-05-06

Publications (1)

Publication Number Publication Date
US2282268A true US2282268A (en) 1942-05-05

Family

ID=5794936

Family Applications (1)

Application Number Title Priority Date Filing Date
US317946A Expired - Lifetime US2282268A (en) 1938-05-06 1940-02-08 Electric circuit breaker

Country Status (5)

Country Link
US (1) US2282268A (enrdf_load_stackoverflow)
BE (1) BE434204A (enrdf_load_stackoverflow)
CH (1) CH209746A (enrdf_load_stackoverflow)
FR (1) FR854401A (enrdf_load_stackoverflow)
GB (1) GB528906A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2426250A (en) * 1943-05-21 1947-08-26 Allis Chalmers Mfg Co Gas blast circuit breaker
US2923930A (en) * 1960-02-02 Certificate of correction

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2923930A (en) * 1960-02-02 Certificate of correction
US2426250A (en) * 1943-05-21 1947-08-26 Allis Chalmers Mfg Co Gas blast circuit breaker

Also Published As

Publication number Publication date
BE434204A (enrdf_load_stackoverflow)
FR854401A (fr) 1940-04-15
GB528906A (en) 1940-11-11
CH209746A (de) 1940-04-30

Similar Documents

Publication Publication Date Title
US2574334A (en) Air-blast circuit breaker
US2108560A (en) Circuit breaker
US3052783A (en) Compressed-gas circuit interrupters
GB1495444A (en) Electrical circuit breakers
GB860246A (en) Improvements in or relating to electric circuit interrupters
US2282268A (en) Electric circuit breaker
US2238567A (en) Circuit breaker
GB595217A (en) Improvements in or relating to gas-blast electric circuit interrupters
GB578422A (en) Improvements in or relating to fluid blast electric circuit interrupters
US2833896A (en) Electric circuit breakers of the air or gas-blast type
US3275778A (en) Compressed-gas circuit interrupter with pressurized arcing chamber and downstream blast valve
GB827408A (en) Improvements in or relating to compressed-gas electric circuit interrupters
US2240233A (en) Gas blast circuit breaker
GB626842A (en) Improvements in or relating to gas-blast electric circuit-breakers
US3018352A (en) High tension air blast circuit breakers with a plurality of series connected breaking gaps per pole
US2303825A (en) Electric circuit breaker
US2708700A (en) Presssure gas operated electrical circuit breaker device
US3334207A (en) Gas blast circuit-breaker with stationary spaced tubular contacts and piston actuated contact bridge including blast valve actuated thereby
GB1081080A (en) Gas-blast circuit breaker
US2873331A (en) Compressed air actuated electric switch
US3206582A (en) Air-blast circuit breaker with double nozzle
US1901679A (en) Gas blast circuit breaker
GB733444A (en) Improvements in and relating to gas-blast electric circuit breakers
US3211869A (en) Gas-blast electric circuit-breaker having contact fingers biased against auxiliary contact after disengagement from throat contact
GB615030A (en) Improvements in or relating to operating means for gas-blast electric switches