US2365133A - Electric circuit breaker of the gas-blast type - Google Patents

Electric circuit breaker of the gas-blast type Download PDF

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Publication number
US2365133A
US2365133A US460161A US46016142A US2365133A US 2365133 A US2365133 A US 2365133A US 460161 A US460161 A US 460161A US 46016142 A US46016142 A US 46016142A US 2365133 A US2365133 A US 2365133A
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US
United States
Prior art keywords
nozzle
contact
gas
arc
arcing
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
US460161A
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English (en)
Inventor
Amer Donald Foster
Webb Walter Henry
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.)
A Reyrolle and Co Ltd
Original Assignee
A Reyrolle and Co Ltd
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 A Reyrolle and Co Ltd filed Critical A Reyrolle and Co Ltd
Application granted granted Critical
Publication of US2365133A publication Critical patent/US2365133A/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
    • H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
    • H01H33/7038—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by a conducting tubular gas flow enhancing nozzle

Definitions

  • This invention relates to an electric circuitbreaker of the kind in which a blast of deionising gas is caused to flow through a nozzle to assist in extinguishing the arc.
  • the arc is usually drawn out by relative movement of the arcing contacts, but for efficient operation it is desirable for the nozzle to be of relatively small size, and this gives rise to difiioulty in cases where the normal currentcarrying capacity required involves comparatively large contact surfaces.
  • the present invention has for its object to avoid this difficulty and at the same time to afford increased speed and certainty of operation.
  • the circuit-breaker according to the invention comprises a pair of fixed arcing contacts one of which is constituted by or is situated at and connected to the low pressure end of the nozzle itself whilst the other is supported from the high pressure side of the nozzle, and a movable bridging contact member which normally bridges the gap between the fixed arcing contacts or members electrically connected thereto and by whose movement the arc is initially formed on the high pressure side of the nozzle, the are being blown by the gas-blast so that one are root moves along the nozzle from the high pressure end to the low pressure end thereof and the arc is caused to take up a position favourable to arc extinction extending between the arcing contacts.
  • the fixed arcing contact supported from the high pressure side of the nozzle is conveniently constituted by the end of a rod or tube disposed substantially in alignment with the nozzle axis, and in this case the fixed arc-initiating contact, with which the bridging contact member cooperates may be constituted by the arcing contact rod or tube or by a tube surrounding it and electrically connected to it.
  • the bridging contact member itself may be constituted by a tube surrounding and electrically connected to the arcing contact rod or tube.
  • the bridging contact member preferably moves in a direction substantially parallel to the nozzle axis.
  • the circuitbreaker is enclosed within a casing A of generally cylindrical form, to one end of which gas under pressure is introduced, when required, from a suitable reservoir, whilst the other end serves for the discharge of the gases.
  • a metal nozzle B diverging towards the discharge end is mounted in a metal housing 13 secured in the casing A, and the inner surface B of such housing is formed as a cylinder in which can slide a piston C carrying a bridging contact member 0 in the form of a group of inwardly spring-pressed contacts.
  • This piston C is moved by the gas pressure in a direction towards the discharge end of the casing against the action of a spring C and the nozzle B is provided with an external contact surface B with which the bridging contact member C always remains in engagement throughout the piston stroke.
  • the bridging contact member 0 serves to bridge the gap between the nozzle B and a fixed tube D mounted on the high pressure side of the nozzle in axial alignment therewith.
  • This tube D surrounds and is connected by webs D to a central rod D whose end D nearest the nozzle B constitutes one of the arcing contacts of the circuit-breaker.
  • the other arcing contact is constituted by the low pressure end of the nozzle B itself, the two arcing contacts thus both being fixed at an appropriate distance apart, the gap between them or between members electrically connected thereto normally being closed by the bridging contact member C.
  • FIG. 2 shows a modified arrangement of the arcing contacts.
  • the casing A, the nozzl B and metal housing B and the bridging contact member C and its piston C and spring C are arranged as in Figure 1.
  • the tube D and rod D are however replaced in this modification by a simple rod F, with which the bridging contact member C normally engages.
  • The are is initially formed between the contact member C and the rod F, and is at once blown through the nozzle by the gas-blast and i transferred thereby to the two arcing contacts, one of which is constituted by a tip F on the end of the rod F.
  • the other arcing contact may again be constituted by the low pressure end of the nozzle B, or (as shown) by a separate contact B centrally mounted at the low pressure end of the nozzle and connected thereto by webs B
  • the gap between the fixed arcing contacts is chosen to suit the conditions of the circuit on which the circuit-breaker is to be installed, and for voltages below say 11,000 volts, it is convenient to extend the arcing tip F as shown in Figure 2, to a position fairly close to the second 2 arcing contact.
  • An electric circuit-breaker including in combination a nozzle of conducting material, means whereby a blast of deionising gas is caused to flow through the nozzle, a pair of fixed arcing contacts, one of which is situated at the low pressure end the nozzle, means for supporting the other fixed arcing contact from the high pressure side of the nozzle, a fixed arc initiating contact electrically connected to such other arcing contact, a movable arc initiating contact permanently connected electrically to the nozzle and normally engaging with the fixed arc initiating contact and thereby bridging the electrical gap between the two arcing contacts, spring means for urging the movable contact towards its normal position, and a piston carried by the movable contact and exposed to the pressure of the gas-blast It'll against the spring action whereby such gas pressure causes the movable contact to move remaining connected to the nozzle but breaking contact with the fixed arc initiating contact and thereby drawing out the arc on the high pressure side, the arc being blown by th gas-blast so that one are root moves along the
  • An electric circuit-breaker including in combination a nozzle of conducting material, means whereby a blast of deionising gas is caused to flow through the nozzle, a pair of fixed arcing contacts, one of which is situated at the low pressure end of the nozzle, is disposed generally centrally in the gas stream flowing through the nozzle and is electrically connected to the nozzle, mean for supporting the other fixed arcing contact from the high pressure side of the nozzle, a fixed arc-initiating contact electrically connected to such other arcing contact, a movable arcinitiating contact permanently connected to the nozzle and normally engaging with the fixed arcinitiating contact and thereby bridging the electrical gap between the two arcing contacts, spring means for urging the movable contact towards its normal position, and a piston carried by the movable contact and exposed to the pressure of the gas-blast against the spring action whereby such gas pressure causes the movable contact to move while remaining connected to th nozzle but breaking contact with the fixed arc-initiating contact and

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  • Circuit Breakers (AREA)
US460161A 1941-09-25 1942-09-29 Electric circuit breaker of the gas-blast type Expired - Lifetime US2365133A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB272080X 1941-09-25
GB160942X 1942-09-16

Publications (1)

Publication Number Publication Date
US2365133A true US2365133A (en) 1944-12-12

Family

ID=26251791

Family Applications (1)

Application Number Title Priority Date Filing Date
US460161A Expired - Lifetime US2365133A (en) 1941-09-25 1942-09-29 Electric circuit breaker of the gas-blast type

Country Status (5)

Country Link
US (1) US2365133A (US06521211-20030218-C00004.png)
CH (1) CH272080A (US06521211-20030218-C00004.png)
FR (1) FR931052A (US06521211-20030218-C00004.png)
GB (1) GB552893A (US06521211-20030218-C00004.png)
NL (1) NL68754C (US06521211-20030218-C00004.png)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2491821A (en) * 1944-12-13 1949-12-20 Allis Chalmers Mfg Co Gas blast circuit breaker
US5770828A (en) * 1995-07-03 1998-06-23 Abb Research Ltd. Power circuit-breaker

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1067502B (US06521211-20030218-C00004.png) *
EP1113475A1 (en) * 1999-12-30 2001-07-04 ABB Research Ltd. Arcing contact assembly for medium and/or high voltage circuit breakers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2491821A (en) * 1944-12-13 1949-12-20 Allis Chalmers Mfg Co Gas blast circuit breaker
US5770828A (en) * 1995-07-03 1998-06-23 Abb Research Ltd. Power circuit-breaker

Also Published As

Publication number Publication date
FR931052A (fr) 1948-02-12
CH272080A (fr) 1950-11-30
GB552893A (en) 1943-04-29
NL68754C (US06521211-20030218-C00004.png)

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