US3668352A - Blast orifice unit for self-blasting compressed gas electric circuit-breakers - Google Patents
Blast orifice unit for self-blasting compressed gas electric circuit-breakers Download PDFInfo
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- US3668352A US3668352A US92671A US3668352DA US3668352A US 3668352 A US3668352 A US 3668352A US 92671 A US92671 A US 92671A US 3668352D A US3668352D A US 3668352DA US 3668352 A US3668352 A US 3668352A
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- United States
- Prior art keywords
- interruption chamber
- zone
- holes
- interruption
- shell
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- 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
- H01H33/7023—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by an insulating tubular gas flow enhancing nozzle
- H01H33/703—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by an insulating tubular gas flow enhancing nozzle having special gas flow directing elements, e.g. grooves, extensions
Definitions
- the object of this invention is an improved blast orifice unit for self-blasting compressed gas circuit-breakers, which greatly increases the performance of the interruption chambers with which these circuit-breakers are equipped in comparison with'the known prior art types.
- L a where L stands for the chamber end part length stated in mm, and U,. is the circuit-breaker rated service voltage expressed in kV.
- An object of this invention istherefore to obtain the best possible performance of an interruption chamber for compressed gas circuit-breakers, structurally improved with respect to present devices and with particular reference to the interruption chamber of the aforementioned Italian patent.
- a further object of this invention is to improve the decom-
- a still further object of this invention is to improve and accelerate the outflow of decomposition and quenching gases through the exhaust orifice of the chamber and decreasing the whirling effects occurring in said outlet flow.
- a plurality of decompression holes is terruption chamber.
- the chamber further comprises a third substantially conical and divergent zone, the length of which is determined from the aforementioned experimental relation:
- This third divergent zone includes a plurality of ring-like grooves, each of which has a substantially triangular cross secangles less than in the cylindrical, and smaller surfaced'zone where they have their mouth.
- a concentric external shell surrounds chamber proper and has an outer diameter with the chamber axis, an flow direction.
- the outlet natively, pled in close contact with the interruption chamber.
- FIG. 1 schematically shows the longitudinal section of an interruption chamber with its outward communicating holes (or decompresand the conical divergent end zone;
- FIG. 2 shows, on a larger scale, the detail of a decompression hole in the smaller surfaced zone.
- the improved blast orifice unit of the interruption chamber of this invention comprises a shell 4, made of the same material as the interruption chamber and and consequently by arrows 7 (the A-A).
- Holes 6 unlike prior art constructions, do not have their axes perpendicular to axis A-A of the interruption chamber; their shape therefore is not the standard right truncated cone shape of the holes adopted by the known technique; on the contrary, as previously noted, they have an oblique flow axis from zone towards zone 9, the flow axis being therefore inclined in the gas outflow direction, towards axis A-A, by an angle a that, according to the preferred embodiment of this invention, ranges from 45 to 65.
- the holes which pass through the Wall of the interruption chamber proper have their outlet sections referenced l 1.
- groove 16 is disposed concentrically to the interruption chamber, and has a substantially triangular cross section with an open base 12 directed in the same direction as outlet orifice 2 of the interruption chamber; and, on the drawing plane, basel2 also denotes the mark of the ring which is the open air outflow section of groove 16.
- Groove 16 can be deemed a toroidal body generated by the substantially triangular geometrical figure defined by sides l1, l2 and 19 in FIGS. 1 and 2, said figure being supposed as revolving around axis A-A of the chamber, which consequently becomes coincident with the tore axis.
- the generatrix line of the toroidal body coincident with the side 19 and opposed, on the drawing plane, to the mark of the outlet section ll, is inclined, in the outflow direction and towards axis A-A, at an angle [3 ranging from 30 to 45.
- each slanting truncated cone hole 6 directs the flow of quenching gas along arrows 8; then the gas reaches groove 16 and at side 19 strikes against the protective shield formed thereby, thus undergoing a deflection in the direction of arrows 17 substantially parallel to axis A-A and to inner flow 7.
- the final flow of the gas becomes substantially parallel to axis A-A of the chamber and can thus join the gases exiting from outlet opening or orifice 2 of the chamber without giving rise to any'whirl phenomena.
- shell 4 prevents the hot gas (heated in consequence of its contact with the arc) exiting from holes 6 from coming in contact with the cylinder 20 made of bakelized paper or other suitable insulating material.
- the efficient protection of cylinder 20 is in this way obtained, thereby prolonging its operational life.
- a further advantage ensuing from this invention consists in obtaining a thrust which improves the opening of the circuit breaker by accelerating the displacement of the moving part (in the direction of arrow 18) with which moving contact 3 is jointed. In fact, the gas flowing in the direction of arrows 8, strikes side 19 and develops a thrust against shell 4.
- this thrust can be analyzed by resolving it in two orthogonal directions, one parallel to axis A-A and the other perpendicular thereto; the component according to the latter direction has no effect on the movement of the chamber, since the interruption chamber has no displacement perpendicular to axis A-A, whereas the component parallel to axis A A improves the circuit breaker opening (see arrow 18, FIG. 2).
- shell 4 can be extended in the outflow direction so that it surrounds (besides zones 1 and 5) not only a part but the whole of zone 9, thus making decompression holes 6 open into groove 16, extending in a hollow having a right cross section in the form of a ring which coaxially surrounds the whole interruption chamber and has its outlet end section (equivalent to section 12) laying in the same plane as the outlet opening or orifice 2 of the chamber.
- decompression holes 6, instead of opening into annular groove 16, can continue on in single outflow ducts which are direct extensions of holes 6 and have cross sections corresponding to the shape of holes 6 or join in a suitable manner with their outlet sections 11. It is possible that outflow ducts l6:would in turn terminate with their own section 12, as shown, or continue on unchanged beyond section 12 to terminate in the same plane as outlet orifice 2, in case the shell 4 is extended to include the whole of zone 9. It may be also noted that the cross section of outflow ducts 16 can be circular, elliptical, or have any other suitable and convenient shape; this also applies to the cross section of decompression holes 6, although in regard to this point, it has been confirmed that the circular cross section is preferable in comparison with others. Also, the device contains at least two decompression holes 6; the preferred embodiment employs four, displaced from each other by although it is considered possible to foresee more than four.
- An axial blast interruption chamber for self-blasting compressed gas electric circuit breakers comprising a blast orifice unit having a conical convergent zone, a cylindrical zone, a plurality of decompression holes operatively associated with said cylindrical zone, the plane of the mouth sections of said holes being disposed parallel to the axis of said interruption chamber, and a substantially conical divergent zone, the length of which is determined by the relation:'
- said divergent zone containing a plurality of ring-like grooves having substantially triangular cross sections with an open base disposed in the direction of the outlet orifice of said interruption chamber; wherein said decompression holes have a substantially oblique truncated cone shape 'with their axes slanting in the direction of gas outflow at an angle (a) less than 90 towards the axis of said interruption chamber; an external shall concentrically surrounding at least a portion of said-interruption chamber; a toroidal groove concentrically disposed in said shell, having a substantially triangular cross section with an open base disposed in the direction of said outlet orifice, the generatrix of said toroidal groove slanting in the direction of gas outflow at an angle (,8) less than 90 towards said chamber axis; outlet sections of said decompression holes opening into said toroidal groove; said shell and said toroidal groove comprising a protective shield which completely covers said outlet sections.
- An interruption chamber according to claim 1, wherein said shell axially extends in said gas outflow direction and surrounds at least said convergent zone, said cylindrical zone, and at least a part of said divergent zone, wherein said shell substantially fully shields said outlet sections.
- An interruption chamber according to claim 1 further comprising at least four decompression holes, adjacent holes having their axes disposed substantially at right angles to one another.
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- Circuit Breakers (AREA)
Abstract
An axial blast interruption chamber for self-blasting compressed gas electric circuit-breakers, having a blast orifice unit internally shaped to provide, in the outlet direction, a conical convergent zone; a cylindrical zone having the smallest surface in comparison with the other internal zones, in which a plurality of decompression holes is located, the mouth sections of these holes being parallel to the axis of the interruption chamber; and a substantially conical divergent zone, the divergent zone having a plurality of ring-like grooves, each of which is of substantially triangular cross section with an open base disposed towards the outlet orifice of the interruption chamber; wherein the decompression holes have substantially the shape of oblique truncated cones with their axis slanting in the gas outflow direction; an external shell concentrically surrounding the interruption chamber; and a toroidal groove concentrically disposed in the shell, having a substantially triangular cross section with an open base disposed in the direction of the outlet orifice, the generatrix of the toroidal groove slanting in the gas outflow direction, the outlet sections of the decompression holes opening into the toroidal groove.
Description
United States Patent Teijeiro [54] BLAST 0R IFICE UNIT FOR SELF-v BLASTING COMPRESSED GAS ELECTRIC CIRCUIT-BREAKERS Benito Jose Calvino Y. Teijeiro, Bergamo, Italy [73] Assignee: Magrini Fabbriche Riunite Magrini Scarpa e Magnano M.S.M.S.p.A., Milan, Italy 22 Filed: Nov. 25, 1970 [21] Appl.No.: 92,671
[72] Inventor:
[ June 6, 1972 FOREIGN PATENTS OR APPLlCATlONS Primary Examiner-Robert Macon Attomey-Stevens, Davis, Miller & Mosher ABSTRACT An axial blast interruption chamber for self-blasting compressed gas electric circuit-breakers, having a blast orifice unit internally shaped to provide, in the outlet direction, a conical convergent zone; a cylindrical zone having the smallest surface in comparison with the other internal zones, in which a plurality of decompression holes is located, the mouth sections of these holes being parallel to the axis of the interruption chamber; and a substantially conical divergent zone, the divergent zone having a plurality of ring-like grooves, each of which is of substantially triangular cross section with an open base disposed towards the outlet orifice of the interruption chamber; wherein the decompression holes have substantially the shape of oblique truncated cones with their axis slanting in the gas outflow direction; an external shell concentrically surrounding the interruption chamber; and 'a toroidal groove concentrically disposed in the shell, having a substantially triangular cross section with an open base disposed in the direction of the outlet orifice, the generatrix of the toroidal groove slanting in the gas outflow direction, the outlet sections of the decompression holes opening into the toroidal groove.
7 Claims,2 Drawing Figures 1 BLAST ORIFICE UNIT FOR SELF-BLASTING COMPRESSED GAS ELECTRIC CIRCUIT-BREAKERS BACKGROUND OF THE INVENTION 1. Field of the Invention The object of this invention is an improved blast orifice unit for self-blasting compressed gas circuit-breakers, which greatly increases the performance of the interruption chambers with which these circuit-breakers are equipped in comparison with'the known prior art types.
2. Description of the Prior Art Compressed gas circuit-breakers are already well known relation:
or, after simplification:
L a where L stands for the chamber end part length stated in mm, and U,. is the circuit-breaker rated service voltage expressed in kV.
It has been found, however, that the axial blast interruption chambers so far known do not attain top performance with respect to the arc quenching gas exhaust and the protection of the parts external to the chamber against the action of the arc. This performance lack applies as well to the displacement speed of the moving parts within the chamber on which'the disengagement of the moving from the fixed contact of a single-pole circuit-breaker directly depends.
SUMMARY OF THE INVENTION An object of this invention istherefore to obtain the best possible performance of an interruption chamber for compressed gas circuit-breakers, structurally improved with respect to present devices and with particular reference to the interruption chamber of the aforementioned Italian patent.
A further object of this invention is to improve the decom- A still further object of this invention is to improve and accelerate the outflow of decomposition and quenching gases through the exhaust orifice of the chamber and decreasing the whirling effects occurring in said outlet flow.
conical and convergent zone and a second cylindrical zone, the latter having the smallest surface in comparison with the other internal zones. A plurality of decompression holes is terruption chamber.
The chamber further comprises a third substantially conical and divergent zone, the length of which is determined from the aforementioned experimental relation:
This third divergent zone includes a plurality of ring-like grooves, each of which has a substantially triangular cross secangles less than in the cylindrical, and smaller surfaced'zone where they have their mouth.
A concentric external shell surrounds chamber proper and has an outer diameter with the chamber axis, an flow direction. The outlet natively, pled in close contact with the interruption chamber.
BRIEF DESCRIPTION OF TI-IE DRAWING tion will be hereinafter described in detail with reference to the attached drawing, wherein: Y
FIG. 1 schematically shows the longitudinal section of an interruption chamber with its outward communicating holes (or decompresand the conical divergent end zone; and
FIG. 2 shows, on a larger scale, the detail of a decompression hole in the smaller surfaced zone.
DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIGS. 1 and 2, the improved blast orifice unit of the interruption chamber of this invention comprises a shell 4, made of the same material as the interruption chamber and and consequently by arrows 7 (the A-A).
Further, unlike the known prior art, however, these holes do not open through section 1 1, directly into open air; rather they open into annular groove or slot 16 in the shell 4. Groove 16 is disposed concentrically to the interruption chamber, and has a substantially triangular cross section with an open base 12 directed in the same direction as outlet orifice 2 of the interruption chamber; and, on the drawing plane, basel2 also denotes the mark of the ring which is the open air outflow section of groove 16. Groove 16 can be deemed a toroidal body generated by the substantially triangular geometrical figure defined by sides l1, l2 and 19 in FIGS. 1 and 2, said figure being supposed as revolving around axis A-A of the chamber, which consequently becomes coincident with the tore axis. According to this invention, the generatrix line of the toroidal body, coincident with the side 19 and opposed, on the drawing plane, to the mark of the outlet section ll, is inclined, in the outflow direction and towards axis A-A, at an angle [3 ranging from 30 to 45.
As shown by the arrows in FIG. 2, the arrangement of the decompression holes 6 and their particular shaping determine the flow of quenching gas therethrough. Each slanting truncated cone hole 6 directs the flow of quenching gas along arrows 8; then the gas reaches groove 16 and at side 19 strikes against the protective shield formed thereby, thus undergoing a deflection in the direction of arrows 17 substantially parallel to axis A-A and to inner flow 7.
Several advantageous results are achieved with this arrangement. First, a regularization in the streaming of the gas flow through the decompression holes 6 is obtained, whereby the exhaust from these holes is facilitated with a consequent quicker decompression of cylindrical zone 5; the whirl phenomena inside zone 5, in particular, and inside the whole interruption chamber generally, is decreased to a negligible amount.
Secondly, the final flow of the gas becomes substantially parallel to axis A-A of the chamber and can thus join the gases exiting from outlet opening or orifice 2 of the chamber without giving rise to any'whirl phenomena.
Thirdly, shell 4, and in particular, the protection shield established in zone 19 by this shell, prevents the hot gas (heated in consequence of its contact with the arc) exiting from holes 6 from coming in contact with the cylinder 20 made of bakelized paper or other suitable insulating material. The efficient protection of cylinder 20 is in this way obtained, thereby prolonging its operational life.
Finally, a further advantage ensuing from this invention (an advantage wholly non-existent in the devices of the known prior art) consists in obtaining a thrust which improves the opening of the circuit breaker by accelerating the displacement of the moving part (in the direction of arrow 18) with which moving contact 3 is jointed. In fact, the gas flowing in the direction of arrows 8, strikes side 19 and develops a thrust against shell 4. The effects of this thrust can be analyzed by resolving it in two orthogonal directions, one parallel to axis A-A and the other perpendicular thereto; the component according to the latter direction has no effect on the movement of the chamber, since the interruption chamber has no displacement perpendicular to axis A-A, whereas the component parallel to axis A A improves the circuit breaker opening (see arrow 18, FIG. 2).
The advantages obtained by this invention are increased by the advantages due to the particular shape of the lower part 9 of the chamber which is provided with triangular cross-sectioned ring-like grooves 13. In fact, resultants 15 of generation lines 14 of the decomposition gases present a component parallel to axis A-A which improves both the outflow of the quenching (or deionizing) gas and the decomposition gas.
The invention as hereinabove described, exemplified, illustrated and hereunder claimed, can be modified without going outside the scope thereof. For example, shell 4 can be extended in the outflow direction so that it surrounds (besides zones 1 and 5) not only a part but the whole of zone 9, thus making decompression holes 6 open into groove 16, extending in a hollow having a right cross section in the form of a ring which coaxially surrounds the whole interruption chamber and has its outlet end section (equivalent to section 12) laying in the same plane as the outlet opening or orifice 2 of the chamber. Alternatively, decompression holes 6, instead of opening into annular groove 16, can continue on in single outflow ducts which are direct extensions of holes 6 and have cross sections corresponding to the shape of holes 6 or join in a suitable manner with their outlet sections 11. It is possible that outflow ducts l6:would in turn terminate with their own section 12, as shown, or continue on unchanged beyond section 12 to terminate in the same plane as outlet orifice 2, in case the shell 4 is extended to include the whole of zone 9. It may be also noted that the cross section of outflow ducts 16 can be circular, elliptical, or have any other suitable and convenient shape; this also applies to the cross section of decompression holes 6, although in regard to this point, it has been confirmed that the circular cross section is preferable in comparison with others. Also, the device contains at least two decompression holes 6; the preferred embodiment employs four, displaced from each other by although it is considered possible to foresee more than four.
What is claimed is:
1. An axial blast interruption chamber for self-blasting compressed gas electric circuit breakers, comprising a blast orifice unit having a conical convergent zone, a cylindrical zone, a plurality of decompression holes operatively associated with said cylindrical zone, the plane of the mouth sections of said holes being disposed parallel to the axis of said interruption chamber, and a substantially conical divergent zone, the length of which is determined by the relation:'
said divergent zone containing a plurality of ring-like grooves having substantially triangular cross sections with an open base disposed in the direction of the outlet orifice of said interruption chamber; wherein said decompression holes have a substantially oblique truncated cone shape 'with their axes slanting in the direction of gas outflow at an angle (a) less than 90 towards the axis of said interruption chamber; an external shall concentrically surrounding at least a portion of said-interruption chamber; a toroidal groove concentrically disposed in said shell, having a substantially triangular cross section with an open base disposed in the direction of said outlet orifice, the generatrix of said toroidal groove slanting in the direction of gas outflow at an angle (,8) less than 90 towards said chamber axis; outlet sections of said decompression holes opening into said toroidal groove; said shell and said toroidal groove comprising a protective shield which completely covers said outlet sections.
2. An interruption chamber according to claim 1, wherein said angle (a) ranges from 45 to 65.
3. An interruption chamber according to claim 1, wherein said angle (,8) ranges from 30 to 45.
4. An interruption chamber according to claim 1, wherein said shell axially extends in said gas outflow direction and surrounds at least said convergent zone, said cylindrical zone, and at least a part of said divergent zone, wherein said shell substantially fully shields said outlet sections.
5. An interruption chamber according to claim 1, further comprising at least four decompression holes, adjacent holes having their axes disposed substantially at right angles to one another.
6. An interruption chamber according to claim 1, wherein said shell comprises a single unit with said interruption chamber. 5
7. Interruption chamber according to claim 1, wherein said shell comprises at least one part distinct from and in close contact with said interruption chamber
Claims (7)
1. An axial blast interruption chamber for self-blasting compressed gas electric circuit breakers, comprising a blast orifice unit having a conical convergent zone, a cylindrical zone, a plurality of decompression holes operatively associated with said cylindrical zone, the planE of the mouth sections of said holes being disposed parallel to the axis of said interruption chamber, and a substantially conical divergent zone, the length of which is determined by the relation: said divergent zone containing a plurality of ring-like grooves having substantially triangular cross sections with an open base disposed in the direction of the outlet orifice of said interruption chamber; wherein said decompression holes have a substantially oblique truncated cone shape with their axes slanting in the direction of gas outflow at an angle ( Alpha ) less than 90* towards the axis of said interruption chamber; an external shall concentrically surrounding at least a portion of said interruption chamber; a toroidal groove concentrically disposed in said shell, having a substantially triangular cross section with an open base disposed in the direction of said outlet orifice, the generatrix of said toroidal groove slanting in the direction of gas outflow at an angle ( Beta ) less than 90* towards said chamber axis; outlet sections of said decompression holes opening into said toroidal groove; said shell and said toroidal groove comprising a protective shield which completely covers said outlet sections.
2. An interruption chamber according to claim 1, wherein said angle ( Alpha ) ranges from 45* to 65* .
3. An interruption chamber according to claim 1, wherein said angle ( Beta ) ranges from 30* to 45* .
4. An interruption chamber according to claim 1, wherein said shell axially extends in said gas outflow direction and surrounds at least said convergent zone, said cylindrical zone, and at least a part of said divergent zone, wherein said shell substantially fully shields said outlet sections.
5. An interruption chamber according to claim 1, further comprising at least four decompression holes, adjacent holes having their axes disposed substantially at right angles to one another.
6. An interruption chamber according to claim 1, wherein said shell comprises a single unit with said interruption chamber.
7. Interruption chamber according to claim 1, wherein said shell comprises at least one part distinct from and in close contact with said interruption chamber.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT2497369 | 1969-11-27 | ||
| CH515771 | 1971-04-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3668352A true US3668352A (en) | 1972-06-06 |
Family
ID=25697107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US92671A Expired - Lifetime US3668352A (en) | 1969-11-27 | 1970-11-25 | Blast orifice unit for self-blasting compressed gas electric circuit-breakers |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3668352A (en) |
| BE (1) | BE764619Q (en) |
| CH (1) | CH537092A (en) |
| DE (1) | DE2057686A1 (en) |
| FR (1) | FR2072457A5 (en) |
| GB (1) | GB1336734A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3949182A (en) * | 1973-06-14 | 1976-04-06 | Magrini Galileo S.P.A. | Breaking chamber for self-blasting compressed gas electric circuit-breakers |
| US3995130A (en) * | 1973-03-20 | 1976-11-30 | Bbc Brown Boveri & Company Limited | Arc quenching chamber component structure for circuit breakers operating with pressurized gas |
| US4667072A (en) * | 1983-08-24 | 1987-05-19 | Hitachi, Ltd. | Gas-insulated circuit breaker |
| US5155312A (en) * | 1990-03-13 | 1992-10-13 | Hitachi, Ltd. | Puffer type gas circuit interrupter |
| US20170352509A1 (en) * | 2014-12-11 | 2017-12-07 | General Electric Technology Gmbh | High-voltage electrical circuit breaker device with optimised automatic extinction |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0495322A (en) * | 1990-08-03 | 1992-03-27 | Hitachi Ltd | Gas blast circuit breaker |
| FR2692400B1 (en) * | 1992-06-10 | 1997-06-27 | Alsthom Gec | MULTIPLE DIVERGENT BLOWING NOZZLE. |
| FR2692401B1 (en) * | 1992-06-10 | 1994-08-19 | Gec Alsthom T & D Sa | Breaker nozzle with several diverging points. |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1944403A (en) * | 1931-05-21 | 1934-01-23 | Clere Andre | Arc extinguishing chimney |
| US3291948A (en) * | 1964-08-06 | 1966-12-13 | Westinghouse Electric Corp | Orifice structure for compressed gas-circuit interrupter |
| DE1254218B (en) * | 1965-11-10 | 1967-11-16 | Licentia Gmbh | Gas pressure switch |
| FR1549097A (en) * | 1967-01-03 | 1968-12-06 | ||
| US3551625A (en) * | 1966-09-01 | 1970-12-29 | Westinghouse Electric Corp | Circuit breakers |
-
1970
- 1970-11-24 DE DE19702057686 patent/DE2057686A1/en active Pending
- 1970-11-25 US US92671A patent/US3668352A/en not_active Expired - Lifetime
- 1970-11-26 FR FR7042538A patent/FR2072457A5/fr not_active Expired
- 1970-11-27 GB GB5650770A patent/GB1336734A/en not_active Expired
-
1971
- 1971-03-22 BE BE764619A patent/BE764619Q/en active
- 1971-04-08 CH CH515771A patent/CH537092A/en not_active IP Right Cessation
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1944403A (en) * | 1931-05-21 | 1934-01-23 | Clere Andre | Arc extinguishing chimney |
| US3291948A (en) * | 1964-08-06 | 1966-12-13 | Westinghouse Electric Corp | Orifice structure for compressed gas-circuit interrupter |
| DE1254218B (en) * | 1965-11-10 | 1967-11-16 | Licentia Gmbh | Gas pressure switch |
| US3551625A (en) * | 1966-09-01 | 1970-12-29 | Westinghouse Electric Corp | Circuit breakers |
| FR1549097A (en) * | 1967-01-03 | 1968-12-06 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3995130A (en) * | 1973-03-20 | 1976-11-30 | Bbc Brown Boveri & Company Limited | Arc quenching chamber component structure for circuit breakers operating with pressurized gas |
| US3949182A (en) * | 1973-06-14 | 1976-04-06 | Magrini Galileo S.P.A. | Breaking chamber for self-blasting compressed gas electric circuit-breakers |
| US4667072A (en) * | 1983-08-24 | 1987-05-19 | Hitachi, Ltd. | Gas-insulated circuit breaker |
| US5155312A (en) * | 1990-03-13 | 1992-10-13 | Hitachi, Ltd. | Puffer type gas circuit interrupter |
| US20170352509A1 (en) * | 2014-12-11 | 2017-12-07 | General Electric Technology Gmbh | High-voltage electrical circuit breaker device with optimised automatic extinction |
Also Published As
| Publication number | Publication date |
|---|---|
| GB1336734A (en) | 1973-11-07 |
| DE2057686A1 (en) | 1971-06-03 |
| BE764619Q (en) | 1971-08-16 |
| CH537092A (en) | 1973-06-29 |
| FR2072457A5 (en) | 1971-09-24 |
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