US2536270A - Fluid pressure operated circuit breaker - Google Patents

Fluid pressure operated circuit breaker Download PDF

Info

Publication number
US2536270A
US2536270A US2920A US292048A US2536270A US 2536270 A US2536270 A US 2536270A US 2920 A US2920 A US 2920A US 292048 A US292048 A US 292048A US 2536270 A US2536270 A US 2536270A
Authority
US
United States
Prior art keywords
circuit breaker
piston
fluid pressure
cylinder
pressure operated
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
US2920A
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 US2536270A publication Critical patent/US2536270A/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
    • 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
    • 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
    • H01H33/16—Impedances connected with contacts

Definitions

  • FLUID PRESSURE OPERATED CIRCUIT BREAKER Filed Jan. 17, 1948 Patented Jan. 2, 1951
  • FLUID PRESSURE OPERATED CIRCUIT BREAKER Haekon Forwald, Valhalla, Ludvika, Sweden, assignor to Allmanna Svenska Elektriska Aktiebolagct, Vasteras, Sweden, a Swedish corporation Application January 17, 1948, Serial No. 2,920
  • the present invention has for its object an improvement of the invention shown in my pending application, Serial No. 2 913, filed Jan. 17, 1948.
  • the two breaking gaps are simultaneously opened and then the breaking gap connected in parallel with the resistance is again closed.
  • a special retarding device for the 'latter breaking gap.
  • Such a retarding device means, however, a complication and is difiicult to reach for adjusting.
  • the present invention has for its object a modification of the said arrangement, by which without any special precautions guarantee is reached that the main breaking gap, 1, e. the breaking gap coupled inparallel with the resistance, is entirely opened, before the contacts in the other breaking gap begin to separate. Further the opening time for the main contacts easily can be regulated by regulation of the speed, at which the operating pipe line is emptied of compressed air. (By a regulable ex hausting valve.)
  • the accompanying drawing shows in vertical section one form of the circuit breaker in accordance with this invention.
  • I designates the pillar insulator, on which the whole circuit breaker rests.
  • 2 is a metal casing, to which one of the conductors to the circuit breaker is connected.
  • On this metal casing rests an insulating cylinder 3, which at the upper end is closed by a cover 4, which at the edge is provided with outlets for the compressed air.
  • the other conductor to the circuit breaker is connected to this cover, and on the same a metal sleeve 5 is attached, carrying the stationary contact l of the contact pair 1, 8.
  • the movable contact 8 in the cylinder 3 is by means of a rod attached to the piston 9, which is movable in the cylinder Iii.
  • In the cylinder is there is a block ii of an elastic suitablyinsulating material, serving as damper for the impacts from the piston 9.
  • the space around the contact pair l, 8 contains an insulating cylinder 6', upon which is mounted a resistance consisting of a fabric of asbestos yarn and very fine resistance wires, or
  • a piston I3 is movable and also for this a dampening member [4 is provided, consisting of a block of elastic material arranged on the bottom of the cylinder.
  • the cylinder l2 may by the operating line l5 be brought in communication either with the atmosphere or with the compressed air container of the circuit breaker.
  • the two cylinders are in direct communication with each other by an opening IE but also by a channel l8, which at one end opens to the cylinder iii through the opening I! and in the other end to the cylinder H2 in the space is between the piston l3 and the cylinder cover.
  • the breaking gap operated by the piston i3 consists of the movable contact 2! and the stationary contact arranged in the casing 2.
  • the former is attached to the piston It by means of a rod 22, which nearest to the piston i3 has a thicker part 23, fitting the hole in the cover of the cylinder.
  • the arrangement acts in the following way: when opening the circuit breaker compressed air at first is given admittance as well to the circuit breaker as to the operating line l5, When the circuit breaker has been entirely filled with air, the operating line I 5 is brought in communication with the free air. As then the pressure in the circuit breaker will be higher than the pressure in the cylinders iii and i2, the piston 9 at first will move downwards, so that the breaking gap 1, 8 is opened. When the piston 9 during its motion downwards has passcd the opening I l of the channel iii, the pressure in the circuit breaker also will act on the piston [3, which then moves to the left until it strikes the buffer l4.
  • An air blast circuit breaker comprising a compressed air chamber, contacts forming a main breaker gap, contacts forming an auxiliary breaker gap, means coupling said gaps in series in said compressed air chamber, a resistance connected in parallel with one of said gaps, cylinders and spring-balanced pistons actuated by compressed air for the operation of the movable contacts of said gaps, an evacuating channel for the said cylinders, a channel between said cylinders giving access to compressed air to actuate one of said pistons after evacuation of the cylinders, and only when the other piston at the 4 opening of the main breaker gap has moved substantially through its full stroke.

Description

Jan. 2, 1951 H. FORWALD 2,536,270
FLUID PRESSURE OPERATED CIRCUIT BREAKER Filed Jan. 17, 1948 Patented Jan. 2, 1951 FLUID PRESSURE OPERATED CIRCUIT BREAKER Haekon Forwald, Valhalla, Ludvika, Sweden, assignor to Allmanna Svenska Elektriska Aktiebolagct, Vasteras, Sweden, a Swedish corporation Application January 17, 1948, Serial No. 2,920
In Sweden May 11, 1944 Section 1, Public Law 690, August 8, 1946 Patent expires May 11, 1964 1 Claim. 1
The present invention has for its object an improvement of the invention shown in my pending application, Serial No. 2 913, filed Jan. 17, 1948. In this the two breaking gaps are simultaneously opened and then the breaking gap connected in parallel with the resistance is again closed. In order to ensure that the latter breaking gap remains open so long that the extinction in reality can take place and the other breaking gap thus only be loaded by the current through the resistance there must be a special retarding device for the 'latter breaking gap. Such a retarding device means, however, a complication and is difiicult to reach for adjusting.
The present invention has for its object a modification of the said arrangement, by which without any special precautions guarantee is reached that the main breaking gap, 1, e. the breaking gap coupled inparallel with the resistance, is entirely opened, before the contacts in the other breaking gap begin to separate. Further the opening time for the main contacts easily can be regulated by regulation of the speed, at which the operating pipe line is emptied of compressed air. (By a regulable ex hausting valve.)
The accompanying drawing shows in vertical section one form of the circuit breaker in accordance with this invention. On the drawing I designates the pillar insulator, on which the whole circuit breaker rests. 2 is a metal casing, to which one of the conductors to the circuit breaker is connected. On this metal casing rests an insulating cylinder 3, which at the upper end is closed by a cover 4, which at the edge is provided with outlets for the compressed air. The other conductor to the circuit breaker is connected to this cover, and on the same a metal sleeve 5 is attached, carrying the stationary contact l of the contact pair 1, 8. The movable contact 8 in the cylinder 3 is by means of a rod attached to the piston 9, which is movable in the cylinder Iii. In the cylinder is there is a block ii of an elastic suitablyinsulating material, serving as damper for the impacts from the piston 9.
The space around the contact pair l, 8 contains an insulating cylinder 6', upon which is mounted a resistance consisting of a fabric of asbestos yarn and very fine resistance wires, or
2 upon which, as shown in the drawing, a resistance 6 is wound, said resistance being coupled in parallel with the breaker gap 7, 8.
Below the cylinder in another cylinder [2 is arranged. In it a piston I3 is movable and also for this a dampening member [4 is provided, consisting of a block of elastic material arranged on the bottom of the cylinder. The cylinder l2 may by the operating line l5 be brought in communication either with the atmosphere or with the compressed air container of the circuit breaker. The two cylinders are in direct communication with each other by an opening IE but also by a channel l8, which at one end opens to the cylinder iii through the opening I! and in the other end to the cylinder H2 in the space is between the piston l3 and the cylinder cover. The breaking gap operated by the piston i3 consists of the movable contact 2! and the stationary contact arranged in the casing 2. The former is attached to the piston It by means of a rod 22, which nearest to the piston i3 has a thicker part 23, fitting the hole in the cover of the cylinder.
The arrangement acts in the following way: when opening the circuit breaker compressed air at first is given admittance as well to the circuit breaker as to the operating line l5, When the circuit breaker has been entirely filled with air, the operating line I 5 is brought in communication with the free air. As then the pressure in the circuit breaker will be higher than the pressure in the cylinders iii and i2, the piston 9 at first will move downwards, so that the breaking gap 1, 8 is opened. When the piston 9 during its motion downwards has passcd the opening I l of the channel iii, the pressure in the circuit breaker also will act on the piston [3, which then moves to the left until it strikes the buffer l4. At the end of its motion the piston l3 will pass by the opening [6 between the two cylinders and the pressure in the circuit breaker will therefore also act on the lower side of the piston 9, so that by its spring 24 it is moved upwards, so that the breaking gap 1, 8 again is closed. The breaking gap 29, 2! again will remain open, because the piston [3 will remain in its left position, until compressed air again is delivered to the operating pipe line.
I claim as my invention:
An air blast circuit breaker, comprising a compressed air chamber, contacts forming a main breaker gap, contacts forming an auxiliary breaker gap, means coupling said gaps in series in said compressed air chamber, a resistance connected in parallel with one of said gaps, cylinders and spring-balanced pistons actuated by compressed air for the operation of the movable contacts of said gaps, an evacuating channel for the said cylinders, a channel between said cylinders giving access to compressed air to actuate one of said pistons after evacuation of the cylinders, and only when the other piston at the 4 opening of the main breaker gap has moved substantially through its full stroke.
' HAAKON FORWALD.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS m Number Name I Date 2,351,903 Baker et a1. June 20, 1944 2,365,134 Amer et a1. Dec. 12, 1944 2,367,934 Flurscheim Jan. 23, 1945
US2920A 1942-05-29 1948-01-17 Fluid pressure operated circuit breaker Expired - Lifetime US2536270A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE238219X 1942-05-29
SE591682X 1944-05-11

Publications (1)

Publication Number Publication Date
US2536270A true US2536270A (en) 1951-01-02

Family

ID=26656155

Family Applications (2)

Application Number Title Priority Date Filing Date
US2913A Expired - Lifetime US2599100A (en) 1942-05-29 1948-01-17 Compressed air circuit breaker with a plurality of series connected breaking gaps
US2920A Expired - Lifetime US2536270A (en) 1942-05-29 1948-01-17 Fluid pressure operated circuit breaker

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US2913A Expired - Lifetime US2599100A (en) 1942-05-29 1948-01-17 Compressed air circuit breaker with a plurality of series connected breaking gaps

Country Status (6)

Country Link
US (2) US2599100A (en)
BE (2) BE450850A (en)
CH (2) CH238219A (en)
DE (1) DE894584C (en)
FR (2) FR896391A (en)
GB (2) GB564949A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1033758B (en) * 1951-02-09 1958-07-10 Voigt & Haeffner Ag Gas pressure switch
DE1020397B (en) * 1954-06-04 1957-12-05 Asea Ab Multi-phase compressed air switch
CH331003A (en) * 1955-02-16 1958-06-30 Bbc Brown Boveri & Cie Compressed gas switch with multiple interruption
US2997563A (en) * 1955-05-27 1961-08-22 Westinghouse Canada Ltd Circuit interrupters
US2970198A (en) * 1957-02-18 1961-01-31 Westinghouse Electric Corp Compressed-gas circuit interrupter
GB898462A (en) * 1957-12-23 1962-06-06 S & C Electric Co Load break disconnecting switch
CH372721A (en) * 1959-06-13 1963-10-31 Bbc Brown Boveri & Cie Compressed air switch with multiple interruption

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2351903A (en) * 1942-04-07 1944-06-20 Westinghouse Electric & Mfg Co Circuit interrupter
US2365134A (en) * 1940-04-15 1944-12-12 Amer Donald Foster Electric circuit breaker of the gas-blast type
US2367934A (en) * 1942-07-30 1945-01-23 Vickers Electrical Co Ltd Fluid blast circuit breaker

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE549741C (en) * 1930-04-04 1932-04-30 Aeg Switching device with several switching points in series
NL34469C (en) * 1931-07-06
NL61773C (en) * 1938-05-27
BE435345A (en) * 1938-05-27
GB549595A (en) * 1941-09-18 1942-11-27 British Thomson Houston Co Ltd Improvements in gas blast electric circuit breakers
US2394086A (en) * 1942-02-18 1946-02-05 Westinghouse Electric Corp Circuit interrupter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2365134A (en) * 1940-04-15 1944-12-12 Amer Donald Foster Electric circuit breaker of the gas-blast type
US2351903A (en) * 1942-04-07 1944-06-20 Westinghouse Electric & Mfg Co Circuit interrupter
US2367934A (en) * 1942-07-30 1945-01-23 Vickers Electrical Co Ltd Fluid blast circuit breaker

Also Published As

Publication number Publication date
US2599100A (en) 1952-06-03
DE894584C (en) 1953-10-26
CH238219A (en) 1945-06-30
CH245906A (en) 1946-11-30
FR912626A (en) 1946-08-14
BE458962A (en)
FR896391A (en) 1945-02-20
BE450850A (en) 1943-06-30
GB564949A (en) 1944-10-19
GB591682A (en) 1947-08-26

Similar Documents

Publication Publication Date Title
US2665351A (en) Arrangement in air blast circuit breaker provided with damping resistance
US2459600A (en) Compressed gas circuit interrupter
US2786119A (en) Valve arrangement for air blast circuit breakers
US2686243A (en) Gas blast circuit breaker
GB490518A (en) Improvements in electrical switchgear
US3331935A (en) Gas-blast circuit breaker having dual piston means providing double-acting puffer arrangement
US3075060A (en) Circuit interrupters
US2747055A (en) High tension circuit breakers
US2536270A (en) Fluid pressure operated circuit breaker
US2908788A (en) Arrangement in electric air blast circuit breakers
US3114815A (en) Fluid-blast circuit interrupter with improved current-transformer housing means
US2766348A (en) Compressed air breaker
GB842986A (en) Improvements in and relating to electrical circuit-breaker of the gas blast type
US2275885A (en) Electric circuit breaker
US2965735A (en) Compressed-gas circuit interrupter
US2786117A (en) Air blast circuit breaker with parallel resistances
GB858791A (en) Improvements in or relating to gas blast electric circuit interrupters
US3256414A (en) Operating mechanism for electrical circuit breaker of the gas blast type
US2531617A (en) Arrangement in compressed air circuit breakers
US2581571A (en) Circuit interrupter
US2235901A (en) Electric circuit breaker
US2999143A (en) Compressed-gas circuit interrupter
US2420888A (en) Oil circuit interrupter
GB1294063A (en) Gas-blast circuit breaker
US2363283A (en) Circuit interrupter