US2293320A - Gas blast circuit breaker - Google Patents
Gas blast circuit breaker Download PDFInfo
- Publication number
- US2293320A US2293320A US347008A US34700840A US2293320A US 2293320 A US2293320 A US 2293320A US 347008 A US347008 A US 347008A US 34700840 A US34700840 A US 34700840A US 2293320 A US2293320 A US 2293320A
- Authority
- US
- United States
- Prior art keywords
- circuit breaker
- contact
- arc
- outlet passage
- gas blast
- 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
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
- H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
- H01H33/16—Impedances connected with contacts
- H01H33/164—Impedances connected with contacts the impedance being inserted in the circuit by blowing the arc onto an auxiliary electrode
-
- 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
- the invention concerns a circuit breaker in which the arc is extinguished by means of a blast of extinguishing medium, the circuit breaker having at least one hollow contact through which the extinguishing medium flows, the contacts of the circuit breaker being bridged over by a protective resistance which is switched in by means of an auxiliary contact which is swept over by the interrupting arc.
- the object of the protective resistance is to retard the speed with which the recovery voltage rises after the are has been extinguished. If the gas blast circuit breaker is connected in series with a second switch point, the power being interrupted by the former and the voltage by the latter, the series-connected switch point can be a simple air break switch because it has only to interrupt the residual current which is limited by the resistance.
- the auxiliary contact is arranged to lie in the axis of flow of the extinguishing medium and furthermore subdividing partitions are built into the outlet passage through which the extinguishing medium flows, the auxiliary arc between the auxiliary contact and the hollow contact brushing against these partitions.
- a designates a switch chamber of an air blast circuit breaker the upper part of which is formed by means of the stationary hollow contact b and which is supplied with compressed air in a known manner through conduit 7 of insulating material.
- the movable countercontact c is located in the switch chamber and guided therein.
- the auxiliary contact e for switching in the protective resistance d is arranged to lie coaxial with and spaced axially from the hollow contact b in the direction of flow of the air blast through the outlet passage f.
- the Space between the auxiliary contact and the insulating wall of the outlet passage f is subdivided by the partitions g.
- the outlet passage has a cylindrical shape so that the partitions g form concentric cylinders.
- the arc initially drawn between hollow contact b and movable contact c upon movement of contact c to extinguishing position is elongated by the air blast to form an inverted loop that strikes the auxiliary contact e, thus momentarily forming an arc having two branches, one between the movable contact c and the auxiliary contact e and the other between the auxiliary contact e and the hollow contact b.
- the first named arc is rapidly deionized by the compressed air blast and extinguished, whilst the second arc is blown by the compressed air towards the ends of the partitions g which when they are made of metal cause the arc to be split up and extinguished.
- the parti tions g can also consist entirely of insulating material, for instance gas producing insulating material, which helps to extinguish the are.
- the extinguishing action can also be further assisted by throttling the air in the outlet passage. This can be achieved by arranging a throttling device, for instance a silencer or cooler h, in front of the partitions in the direction of air flow through the outlet passage.
- the movable contact c can also be designed as a hollow contact and both contacts can be made to move towards each other.
- the protective resistance d can be arranged on the outside wall of the outlet passage for the extinguishing medium as shown in the drawing. It is also possible to wind the resistance in such a manner that there are at least two layers through which the current flows in opposite directions.
- a pair of cooperating arcing contacts supported for relative movement, at least one of said contacts being hollow, means cooperating with said hollow contact to establish a blast of arc extinguishing medium therethrough upon a separation of said cooperating contacts, an insulating member forming an outlet passage for the extinguishing medium discharged through the hollow contact, an auxiliary contact positioned within said outlet passage in axial alinement with and spaced axially from the hollow 3.
- said subdividing partitions are metal cylinders.
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
- Circuit Breakers (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH212922T | 1939-07-26 | ||
DEA89971D DE725314C (de) | 1939-07-26 | 1939-08-02 | Schalter mit Lichtbogenloeschung durch ein stroemendes Loeschmittel |
Publications (1)
Publication Number | Publication Date |
---|---|
US2293320A true US2293320A (en) | 1942-08-18 |
Family
ID=32094453
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US347008A Expired - Lifetime US2293320A (en) | 1939-07-26 | 1940-07-23 | Gas blast circuit breaker |
Country Status (5)
Country | Link |
---|---|
US (1) | US2293320A (xx) |
BE (1) | BE439832A (xx) |
CH (1) | CH212922A (xx) |
DE (1) | DE725314C (xx) |
FR (1) | FR867772A (xx) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3160726A (en) * | 1962-01-15 | 1964-12-08 | cromer |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE762495C (de) * | 1943-01-18 | 1953-04-27 | Brown Ag | Druckgasschalter |
GB755016A (en) * | 1953-07-08 | 1956-08-15 | Reyrolle A & Co Ltd | Improvements relating to electric switchgear |
DE1018129B (de) * | 1956-03-07 | 1957-10-24 | Liebknecht Transformat | Hochspannungsdruckgasschalter |
-
1939
- 1939-07-26 CH CH212922D patent/CH212922A/de unknown
- 1939-08-02 DE DEA89971D patent/DE725314C/de not_active Expired
-
1940
- 1940-07-23 US US347008A patent/US2293320A/en not_active Expired - Lifetime
- 1940-11-23 FR FR867772D patent/FR867772A/fr not_active Expired
- 1940-12-31 BE BE439832D patent/BE439832A/xx unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3160726A (en) * | 1962-01-15 | 1964-12-08 | cromer |
Also Published As
Publication number | Publication date |
---|---|
DE725314C (de) | 1942-09-18 |
BE439832A (xx) | 1940-11-21 |
FR867772A (fr) | 1941-11-27 |
CH212922A (de) | 1940-12-31 |
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