US2836683A - Arc-extinction casing for circuit-breaker - Google Patents
Arc-extinction casing for circuit-breaker Download PDFInfo
- Publication number
- US2836683A US2836683A US568311A US56831156A US2836683A US 2836683 A US2836683 A US 2836683A US 568311 A US568311 A US 568311A US 56831156 A US56831156 A US 56831156A US 2836683 A US2836683 A US 2836683A
- Authority
- US
- United States
- Prior art keywords
- arc
- casing
- nozzle
- extinction
- breaker
- 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
- 239000007789 gas Substances 0.000 description 13
- 238000005192 partition Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 6
- 238000007664 blowing Methods 0.000 description 4
- 230000008033 biological extinction Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 101100128278 Mus musculus Lins1 gene Proteins 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- VFLDPWHFBUODDF-FCXRPNKRSA-N curcumin Chemical compound C1=C(O)C(OC)=CC(\C=C\C(=O)CC(=O)\C=C\C=2C=C(OC)C(O)=CC=2)=C1 VFLDPWHFBUODDF-FCXRPNKRSA-N 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009993 protective function Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
- H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
Definitions
- This extinction is generally effected by blowing the arc, either magnetically or by compressed air, within the interior of a casing which surrounds the contacts. These casings are sometimesy formed by pole plates between which the blowing device lengthens the arc by incurving it until it is extinguished.
- the present invention has for its object a blowing casing in which the rupture of the electric current is obtained with practically no external sign of its occurrence.
- a casing of this kind the flames of the arc are prevented from passing out of the casing; the casing however enables the gases heated by the flames to be evacuated.
- the casing is formed by a portion in the shape of a convergent nozzle which encloses the contacts, this nozzle opening through a narrow passages into an expansion chamber which communicates with the exterior.
- the portion in the form of a nozzle is divided into compartments by means of fins orientated in the general direction of the nozzle, these tins tending to split up the arcs and cool the gases produced by the arcs.
- the nozzle and the expansion chamber have a common wall and the communicating passage between these two spaces is delimited between the edge of this common wall and a partition which is substantially at right angles to the said wall, and which forms at the same time the space of the nozzle and that of the expansion chamber.
- This arrangement has a two-fold advantage; on the one hand the choice of the position of the partition with respect to the common wall enables the dimensions of the narrow passage to be regulated, and on the other hand, the gases passing out of the nozzle are slowed down by their contact with the partition and they pass into the expansion chamber in a direction which is practically opposite to that of their passage out of the nozzle.
- This passage in the form of a baffle assists the effect of cooling and of slowing down of the gases.
- the casing is preferably formed by two pole plates having the general shape of quarters of a circle, coupled at their periphery by a partition, the pole plates being hollowed out, on the one hand internally so as to form a flattened nozzle when they are brought together and on the other hand, in the thickness of these pole plates, ⁇ on each side of the said flattened nozzle, so as to form the expansion chambers.
- Fig. l shows in cross-section, following the line I--I of Fig. 2, an arc-extinction casing improved in accordance with the invention.
- Fig. 2 is a cross-section taken along the line II-II of Fig. l.
- Fig. 3 shows a cross-section, similar to that of Fig. 2, of an alternative form of embodiment.
- the current reaches the incurved xed contact 1 through a metallic winding 2 which is intended to create a magnetic field which ensures the extinction of the arc.
- This eld is guided along a core 14 of magnetic metal, which assembles together the magnetic pole plates 12 held in place by the. insulating cross-member I3 in the form of a reel.
- this winding may be reduced simply to a bar which passes through and which is sufficient to create the necessary magnetic field.
- the contact 1 co-operates the moving contact 3 which can pass from the position shown in full lines (closed position) to the open position 3a shown in dotted lines.
- the arc which is struck between the contacts 1 and 3 moves along these contacts towards the exterior and extends in a curve under the effect of the magnetic field.
- This arc is thus developed between the insulating jaws 4, which have the general shape of a quarter of a circle, of the arc casing.
- These jaws are hollowed-out internally so as to form a kind of convergent attened nozzle 5 which is directed towards the periphery of the casing.
- the fins or blades 6 In the narrower portion of the nozzle are arranged the fins or blades 6, the general direction of which is radial.
- tins may be fitted into slots formed in the pole plates.
- the pole plates are connected together by an incurved partition 7 of insulating material, which is fitted into oppositelydisposed slots in the pole plates, and which practically closes the casing, with the exception of the small spaces 8 formed between the partition 7 and the edge 9 of the peripheries of the pole plates which constitute the extremity of the nozzle 5.
- the partition 7 may have a U-section which encloses the section of the casing. ln this case, the hollow spaces 10 are formed on the external faces of the cheeks.
- an arc-extinction device comprising a attened chamber in which said contact members are housed, a at convergent nozzle communicating with said chamber and forming an extension thereof, and a wall extending opposite the discharge end of said nozzle at a distance therefrom to provide a lateral restricted passage between said wall and said nozzle end, whereby any hot gases generated in said chamber upon formation therein of an arc, expand through said nozzle and issue therefrom in the form of a jet striking said wall and diverted thereby into said lateral restricted passage, said flattened chamber being in the general shape of a sector of a circle, said flat nozzle extending along theperiphery of said sector over a generally circular arc, and said wall extending over an arc of a circle substantially concentric with the former-mentioned arc, said device further comprising two elongated and flattened expansion chambers extending on both sides yof
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
- Circuit Breakers (AREA)
Description
May 27, 1958 A. A. H. soUcHET 2,336,683
ARC-EXTINCTION CASING FOR CIRCUIT-BREAKER Filed Feb. 28, 1956 United States Patent ARC-EXTINCTION CASING FOR CmCUIT-BREAKER Andr A. H. Souchet, Nanterre, France, assignor to La Telemecanique Electrique (Societe Anonyme), Nanterre, France, a company of France Application February 28, 1956, Serial No. 568,311 Claims priority, application France August 29, 1955 1 Claim. (Cl. 20G-144) It is known that, in current-breaking devices and especially in those which have a protective function and are intended to break currents of very high value (shortcir-cuits), it is necessary to provide devices for extinguishing the are which is struck between the contacts which are in the process of separating.
This extinction is generally effected by blowing the arc, either magnetically or by compressed air, within the interior of a casing which surrounds the contacts. These casings are sometimesy formed by pole plates between which the blowing device lengthens the arc by incurving it until it is extinguished.
In the arc-blowing casings of known construction, the arcs which are produced at the moment of the breaks give rise to llames which pass outside the casing and are liable to reach the metallic parts located in the vicinity. In this way there may be produced destructive arcs which are liable to produce, by short-circuit, melting of the conductive members of the apparatus.
It thus becomes essential to leave large air spaces, known as safety perimeters between the casings of the circuit-breaker apparatus and the metallic casings in which they are housed. In the same way, in order to prevent arcing between adjacent poles, it is necessary to locate the poles at fairly large distances from each other.
The present invention has for its object a blowing casing in which the rupture of the electric current is obtained with practically no external sign of its occurrence. In a casing of this kind, the flames of the arc are prevented from passing out of the casing; the casing however enables the gases heated by the flames to be evacuated.
In accordance with the invention, the casing is formed by a portion in the shape of a convergent nozzle which encloses the contacts, this nozzle opening through a narrow passages into an expansion chamber which communicates with the exterior. Preferably, and in known manner, the portion in the form of a nozzle is divided into compartments by means of fins orientated in the general direction of the nozzle, these tins tending to split up the arcs and cool the gases produced by the arcs.
In an advantageous form of construction, the nozzle and the expansion chamber have a common wall and the communicating passage between these two spaces is delimited between the edge of this common wall and a partition which is substantially at right angles to the said wall, and which forms at the same time the space of the nozzle and that of the expansion chamber.
This arrangement has a two-fold advantage; on the one hand the choice of the position of the partition with respect to the common wall enables the dimensions of the narrow passage to be regulated, and on the other hand, the gases passing out of the nozzle are slowed down by their contact with the partition and they pass into the expansion chamber in a direction which is practically opposite to that of their passage out of the nozzle.
'ice
This passage in the form of a baffle assists the effect of cooling and of slowing down of the gases.
The casing is preferably formed by two pole plates having the general shape of quarters of a circle, coupled at their periphery by a partition, the pole plates being hollowed out, on the one hand internally so as to form a flattened nozzle when they are brought together and on the other hand, in the thickness of these pole plates,`on each side of the said flattened nozzle, so as to form the expansion chambers.
The description which follows below with regard to the attached drawings (which are given by way of example only and not in any sense by way of limitation) will make it quite clear how the invention may be carried into effect, the special features which are brought out, either in the drawings or in the text, being understood to form a part of the said invention:
Fig. l shows in cross-section, following the line I--I of Fig. 2, an arc-extinction casing improved in accordance with the invention. Y
Fig. 2 is a cross-section taken along the line II-II of Fig. l.
Fig. 3 shows a cross-section, similar to that of Fig. 2, of an alternative form of embodiment.
In the device shown in these figures, the current reaches the incurved xed contact 1 through a metallic winding 2 which is intended to create a magnetic field which ensures the extinction of the arc. This eld is guided along a core 14 of magnetic metal, which assembles together the magnetic pole plates 12 held in place by the. insulating cross-member I3 in the form of a reel. In the case of high nominal current values, this winding may be reduced simply to a bar which passes through and which is sufficient to create the necessary magnetic field.
With the contact 1 co-operates the moving contact 3 which can pass from the position shown in full lines (closed position) to the open position 3a shown in dotted lines. When the contacts are opened, the arc which is struck between the contacts 1 and 3 moves along these contacts towards the exterior and extends in a curve under the effect of the magnetic field. This arc is thus developed between the insulating jaws 4, which have the general shape of a quarter of a circle, of the arc casing. These jaws are hollowed-out internally so as to form a kind of convergent attened nozzle 5 which is directed towards the periphery of the casing. In the narrower portion of the nozzle are arranged the fins or blades 6, the general direction of which is radial. These tins may be fitted into slots formed in the pole plates. The pole plates are connected together by an incurved partition 7 of insulating material, which is fitted into oppositelydisposed slots in the pole plates, and which practically closes the casing, with the exception of the small spaces 8 formed between the partition 7 and the edge 9 of the peripheries of the pole plates which constitute the extremity of the nozzle 5.
In the jaws 4 are formed hollow spaces 10 which, with the partition 7, form expansion chambers which communicate with the nozzle through the spaces 8. Towards the top of the casing, there is a gap in the partition 7, so that the spaces 10 of the jaws communicate with the exterior through the openings 11.
The device which has just been described operates in the following manner:
The gases heated inside the casing by the arc, as it curves outwards, are increased in speed by the convergent nozzle 5 and are thus led into the narrow part of this nozzle. When the arc comes into contact with the fins 6, it becomes split up by these fins and the small sections of arc are extinguished in each of the compartments which are formed by the lins. In effect, by reason of the presence of the partition 7, there is produced a pressure of gas towards the extremity of the paths followed by the arc elements, and this pressure assists the rupturing power since the dielectric rigidity of ther air increases with pressure. The hotgasespass through the narrow spaces@ which draw Ythem out and give -them a curved trajectory, so that the gases'are very powerfully cooled during this passage. The gases then expand into the chambers 10 andvthis still further accentuates the cooling effect. From the chambers '10, the gases, escape to the exterior, either 'through 'the open-r ings 11 which can be directed in such manner that the gases cannot in any event be dangerous, or through the base of the casing where the chambers `10 may not be entirely closed.
.,'The dimensions of the spaces 8 canv be fixed by experiment in accordance with the values of current to be broken. In fact, if these spaces 3 are too great, the effect of gas pressure which contributes to the extinction kof the arcs is not obtained, and ames may pass out through the openings of the chambers 1t), whilst if these spaces are too small, the gas pressure obtained at the extremities of the nozzle maybe excessive so that 'the arcs are forcedback, and this may give rise to .the production of fresh arcs on the contacts which are in course of separation, resulting lin 'damage to the contact surfaces.
In order to simplify the construction, as shown in Fig. 3, the partition 7 may have a U-section which encloses the section of the casing. ln this case, the hollow spaces 10 are formed on the external faces of the cheeks.
It will of course be understood that modifications may bemade to the forms of embodiment which havebeen described above, in particular by the substitution of equivalent technical means Without thereby departing 'from the spirit or from the scope of the present invention.
What I claim is: f
In combination with a circuit-breaker having sep- 4 l arable contact members liable to give rise to an arc upon separation thereof, an arc-extinction device comprising a attened chamber in which said contact members are housed, a at convergent nozzle communicating with said chamber and forming an extension thereof, and a wall extending opposite the discharge end of said nozzle at a distance therefrom to provide a lateral restricted passage between said wall and said nozzle end, whereby any hot gases generated in said chamber upon formation therein of an arc, expand through said nozzle and issue therefrom in the form of a jet striking said wall and diverted thereby into said lateral restricted passage, said flattened chamber being in the general shape of a sector of a circle, said flat nozzle extending along theperiphery of said sector over a generally circular arc, and said wall extending over an arc of a circle substantially concentric with the former-mentioned arc, said device further comprising two elongated and flattened expansion chambers extending on both sides yof the nozzle and communicating therewith, and said expansion chambers extending over arcs of a circle and having, lat one end thereof, an outlet aperture opening to the atmosphere.
References Cited in the iile of this patent UNITED STATES PATENTS 1,836,994 ASlepian Dec. 15, 1931 2,215,797 Sauer Sept. 24, 1940 2,292,158 Prince Aug.14, 1942 2,293,452 Boehne Aug. 18, 1942 2,393,164 Hobson Jan. l5, 1946 v2,555,993 Oppel et al. June 5, 1951 v2,633,518 Miller Mar. 31, 1953 FOREIGN PATENTS '732,196 'Great Britain June 22, 1955
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1054140X | 1955-08-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2836683A true US2836683A (en) | 1958-05-27 |
Family
ID=9596274
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US568311A Expired - Lifetime US2836683A (en) | 1955-08-29 | 1956-02-28 | Arc-extinction casing for circuit-breaker |
Country Status (5)
Country | Link |
---|---|
US (1) | US2836683A (en) |
BE (1) | BE545609A (en) |
DE (1) | DE1054140B (en) |
FR (1) | FR1130577A (en) |
GB (1) | GB801760A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3073936A (en) * | 1958-10-01 | 1963-01-15 | Gen Electric | Electric circuit interrupter |
US3649791A (en) * | 1969-07-02 | 1972-03-14 | Bbc Brown Boveri & Cie | Arc chute for electrical switch apparatus |
US4254314A (en) * | 1977-09-15 | 1981-03-03 | Siemens Aktiengesellschaft | Arcing chamber with perforated plates of sieve-like ceramics |
US4256937A (en) * | 1978-06-16 | 1981-03-17 | Square D Company | Electromagnetic contactor arc chute |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1104019B (en) * | 1959-09-11 | 1961-04-06 | Continental Elektro Ind Ag | Arc extinguishing chamber for electrical circuit breakers |
NL295859A (en) * | 1962-07-27 | |||
DE1253333B (en) * | 1964-11-23 | 1967-11-02 | Stotz Kontakt Gmbh | Arc extinguishing chamber with deion plates |
GB2125626B (en) * | 1982-08-07 | 1986-04-03 | Terence Henry Taylor | Arc interruption in air break switch |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1836994A (en) * | 1927-11-17 | 1931-12-15 | Westinghouse Electric & Mfg Co | Circuit interrupter |
US2215797A (en) * | 1938-07-20 | 1940-09-24 | Westinghouse Electric & Mfg Co | Circuit interrupter |
US2292158A (en) * | 1941-05-28 | 1942-08-04 | Gen Electric | Gas blast circuit breaker |
US2293452A (en) * | 1939-10-11 | 1942-08-18 | Gen Electric | Electric air circuit breaker |
US2393164A (en) * | 1943-02-27 | 1946-01-15 | Gen Electric | Electric circuit breaker |
US2555993A (en) * | 1949-06-22 | 1951-06-05 | Gen Electric | Circuit interrupter |
US2633518A (en) * | 1948-07-01 | 1953-03-31 | Roller Smith Corp | Air circuit breaker |
GB732196A (en) * | 1952-07-31 | 1955-06-22 | Telemecanique Electrique | Improvements in electrical circuit-breaker apparatus |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE728612C (en) * | 1934-10-20 | 1942-11-30 | Siemens Ag | Arc Chamber Switch |
DE669511C (en) * | 1935-05-03 | 1938-12-30 | Wilhelm Leyhausen | Spark chamber for small self switch |
DE730678C (en) * | 1937-05-08 | 1943-01-15 | Siemens Ag | Arc chamber |
DE705619C (en) * | 1939-08-03 | 1941-05-05 | Siemens Schuckertwerke Akt Ges | Installation auto switch |
US2293513A (en) * | 1939-10-11 | 1942-08-18 | Gen Electric | Electric air circuit breaker |
FR895927A (en) * | 1943-04-08 | 1945-02-07 | Delle Atel Const Electr | Gas exhaust device for self-blowing circuit breakers |
NL118168B (en) * | 1943-07-06 | |||
DE914870C (en) * | 1944-06-29 | 1954-07-12 | Siemens Ag | Arc chamber |
FR1016148A (en) * | 1949-04-29 | 1952-11-03 | Asea Ab | Electric eddy current furnace |
US2615109A (en) * | 1949-12-10 | 1952-10-21 | Gen Electric | Zigzag magnetic labyrinth arc muffler |
-
0
- BE BE545609D patent/BE545609A/xx unknown
-
1955
- 1955-08-29 FR FR1130577D patent/FR1130577A/en not_active Expired
-
1956
- 1956-02-24 GB GB5910/56A patent/GB801760A/en not_active Expired
- 1956-02-28 US US568311A patent/US2836683A/en not_active Expired - Lifetime
- 1956-03-24 DE DET12024A patent/DE1054140B/en active Pending
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1836994A (en) * | 1927-11-17 | 1931-12-15 | Westinghouse Electric & Mfg Co | Circuit interrupter |
US2215797A (en) * | 1938-07-20 | 1940-09-24 | Westinghouse Electric & Mfg Co | Circuit interrupter |
US2293452A (en) * | 1939-10-11 | 1942-08-18 | Gen Electric | Electric air circuit breaker |
US2292158A (en) * | 1941-05-28 | 1942-08-04 | Gen Electric | Gas blast circuit breaker |
US2393164A (en) * | 1943-02-27 | 1946-01-15 | Gen Electric | Electric circuit breaker |
US2633518A (en) * | 1948-07-01 | 1953-03-31 | Roller Smith Corp | Air circuit breaker |
US2555993A (en) * | 1949-06-22 | 1951-06-05 | Gen Electric | Circuit interrupter |
GB732196A (en) * | 1952-07-31 | 1955-06-22 | Telemecanique Electrique | Improvements in electrical circuit-breaker apparatus |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3073936A (en) * | 1958-10-01 | 1963-01-15 | Gen Electric | Electric circuit interrupter |
US3649791A (en) * | 1969-07-02 | 1972-03-14 | Bbc Brown Boveri & Cie | Arc chute for electrical switch apparatus |
US4254314A (en) * | 1977-09-15 | 1981-03-03 | Siemens Aktiengesellschaft | Arcing chamber with perforated plates of sieve-like ceramics |
US4256937A (en) * | 1978-06-16 | 1981-03-17 | Square D Company | Electromagnetic contactor arc chute |
Also Published As
Publication number | Publication date |
---|---|
FR1130577A (en) | 1957-02-07 |
BE545609A (en) | |
DE1054140B (en) | 1959-04-02 |
GB801760A (en) | 1958-09-17 |
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