EP0288040B1 - Circuit Breaker - Google Patents
Circuit Breaker Download PDFInfo
- Publication number
- EP0288040B1 EP0288040B1 EP88106330A EP88106330A EP0288040B1 EP 0288040 B1 EP0288040 B1 EP 0288040B1 EP 88106330 A EP88106330 A EP 88106330A EP 88106330 A EP88106330 A EP 88106330A EP 0288040 B1 EP0288040 B1 EP 0288040B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- arc
- circuit breaker
- insulation film
- fixed
- plates
- 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
- 238000009413 insulation Methods 0.000 claims description 19
- 239000000696 magnetic material Substances 0.000 claims description 7
- 239000003973 paint Substances 0.000 description 7
- 239000000843 powder Substances 0.000 description 4
- 230000008033 biological extinction Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 229920006334 epoxy coating Polymers 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000002904 solvent Substances 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
-
- 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
- H01H9/36—Metal parts
-
- 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
- H01H9/36—Metal parts
- H01H2009/365—Metal parts using U-shaped plates
Definitions
- the present invention relates to a circuit breaker according to the preamble of claim 1, and in particular to an improvement of arc extinguish structure.
- FIG.1A shows the structure nearby a contact and arc extinguish grids 10 of a prior art circuit breaker.
- a fixed contact 4 and an arc runner 5 are fixed on a fixed arm 3.
- the fixed arm 3 is fixed by a bolt 12 and a folded tip part 31 of the fixed arm 3 is also fixed by a bolt 12.
- a movable contact 2 is provided on a movable arm 1. In a closing state, the movable contact 2 and fixed contact 4 are contacted.
- FIG.1B is a plan view for showing a relation between the arc 9 and the arc extinguish grid 10.
- the arc extinguish grid 10 is made of magnetic material and has a notch 10a for introducing the arc. Because the notch 10a is formed, lines of magnetic force are deflected as shown in FIG.1B. Therefore, the arc 9 is moved in a direction shown by an arrow A. Referring now to FIG.1A, the arc is moved from 9b to 9f through 9c, 9d and 9e. The moved arc 9 is stretched, divided and extinguished as described above.
- a circuit breaker which discloses all features of the preamble of claim 1 is known from FR-A-2 348 559 .
- This known circuit breaker comprises an arc extinction means which is also formed by a grid of plates, this grid being disposed in the space above an arc-runner. Furthermore, this known circuit breaker also seems to comprise notches which are formed at the arc introducing end of each plate.
- the upper end of the uppermost plate of this known circuit breaker in addition, is covered by an insulating layer and the lower end of the lowermost plate (which faces the arc-runner) also is covered by an insulating layer.
- These insulating layers preferably are formed like an "U". In a special embodiment, both insulating layers are formed by a kind of band or binding so that the side faces of all plates are covered, too.
- the circuit breaker of the present invention comprises an insulation film which is formed on both surfaces of each plate either at the area of said arc introducing end or at the area of the opposite end thereof.
- the present invention is directed to a circuit breaker in which the arc which is generated during the disconnection of the two contacts is extinguished by means of a grid which is positioned above an arc-runner and which, in addition, comprises a notch which is formed at that end of each plate at which the arc is introduced (i.e. the end which faces the two contacts).
- document EP-A-33 479 discloses a circuit breaker of a somewhat different kind in which the arc extinction is performed by the combination of a so-called "arc motivating assembly” and an arc chute or dionising assembly.
- This arc motivating assembly consists of two columns which are flanking the contact pairs, wherein each column is composed of small plates of a magnetic material that are spaced from each other by insulating layers; furtheron, the top end of each column comprises a choke covered by an insulating layer.
- the arc chute consists of a number of double arc plates formed of a sheet of a magnetic and conductive material which is folded to a "U" in which a thin insulating layer is disposed between the arms of the "U". Due to the different construction of the arc extinction means the insulating layer of this known circuit breaker is a functional necessary construction element in order to make sure that the current follows the arms and the curved portions of the "U". Therefore, the purpose of the provision of this insulating layer cannot be compared to the purpose of the insulating layer of the present invention.
- the document FR-A-1 364 473 discloses a circuit breaker wherein caulking protrusions are provided which are inserted into corresponding holes of side plates in order to connect the plates with the side wall. This document, however, does not disclose the provision of any insulating layers.
- FIG.2A shows a preferred embodiment of a circuit breaker embodying the present invention.
- a fixed contact 4 and an arc runner 5 are fixed on a fixed arm 3.
- the fixed arm 3 is fixed by a bolt 12, and a folded tip part 31 of the fixed arm 3 is also fixed by a bolt 12.
- a movable contact 2 is provided on a movable arm 1.
- Plates 30 of an arc extinguish grid 30 are fixed to side plates 11 by caulking protrusions 50 provided at side part of the plates 30 after inserting the protrusions 50 into holes of the side plates 11.
- the plates 30 of the arc extinguish grid are made of magnetic material and their surfaces are aligned nearly perpendicular to an arc.
- An insulation film 32 covers a front part of both surfaces of each plate 30.
- each plate 30 has an insulation part 32 and a metallic part 34.
- An arc-proof insulating paint such as arc-proof epoxy coating paint (Limitrack: trademark of Ryoden Kasei), or liquid ceramic, is suitable for the insulation film 32.
- the insulation film 32 is formed by dipping the arc plates 30 of the extinguish grid and the side plates 11 into a solution of the arc-proof insulating paint.
- the insulation film 32 covers the arc introducing part 30b of the arc extinguish grid.
- the caulked parts 50 are also covered with the arc-proof insulating paint, the caulked parts 50 are prevented from rusting.
- the arc extinguish grid is made of magnetic material such as iron and has a notch 30a for introducing the arc. Because the notch 30a is formed, lines of magnetic force are deflected (see FIG.1B). Therefore, the arc 9 is moved in the direction shown by an arrow A.
- thermoelectrons are not emitted from the arc extinguish grid since the arc-proof insulation film 32 is formed. Therefore, the arc does not stay, but is smoothly moved into the metallic part 34 of arc extinguish grid.
- the arc 9 touches the metallic part 34 of the arc extinguish grid, the arc 9 is smoothly quenched.
- an arc-proof insulating paint is formed to such a predetermined portion that the side plate 11 only is dipped wholly in the arc-proof insulating paint. In this embodiment, generation of powder from the edge of the side plate 11 due to vibration of the circuit breaker is prevented.
- FIG.3A is a sectional view of a circuit breaker of another embodiment
- FIG.3B is a plan view thereof.
- the insulation films 32 are formed in such a manner that the plates of the arc extinguish grid are covered by the insulation film 32 wider at the part near the arc-runner 5, but narrower at the portion far from the arc-runner 5.
- FIG.4A is a sectional view of a circuit breaker of still another embodiment which is suitable for high voltage and large current
- FIG.4B is a plan view thereof.
- the insulation films 32 are formed at rear ends of the plates 30 of the arc extinguish grid.
- the arc extinguish grid is made of magnetic material and has a notch 30a for introducing the arc. Because the notch 30a is formed, lines of magnetic force are deflected (see FIG.1B). Therefore, the arc 9 is moved in the direction shown by an arrow A. Finally, the arc 9 is moved into the rear ends of the arc extinguish grid. Because the rear ends of of the plates of the grid are covered by the insulation film 32, shortcircuiting by an arc at the rear part as 9g in FIG.1A is prevented, and thus superior and stable breaking efficiency is obtainable.
- FIG.5A and FIG.5B show still another modified embodiment, wherein the insulation film 32 covers a limited part behind the notch 30a of each plate 30 of the arc extinguish grid.
- the insulation film 32 covers a limited part behind the notch 30a of each plate 30 of the arc extinguish grid.
- arc contact time to the metallic part 34 of the arc extinguish grid is longer than that in the embodiment of FIG.4A. Therefore, the cooling and quenching of the arc is very efficient.
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
- Breakers (AREA)
Description
- The present invention relates to a circuit breaker according to the preamble of
claim 1, and in particular to an improvement of arc extinguish structure. - FIG.1A shows the structure nearby a contact and
arc extinguish grids 10 of a prior art circuit breaker. Afixed contact 4 and anarc runner 5 are fixed on afixed arm 3. Thefixed arm 3 is fixed by abolt 12 and a foldedtip part 31 of thefixed arm 3 is also fixed by abolt 12. Amovable contact 2 is provided on amovable arm 1. In a closing state, themovable contact 2 and fixedcontact 4 are contacted. - When an over-current flows in a circuit, the
movable contact 2 is disconnected from thefixed contact 4 by a releasing device (not shown). At this time, anarc 9a occurs between themovable contact 2 and the fixedcontact 4. When themovable arm 1 is moved in to a position x, the arc is moved into aposition 9b. FIG.1B is a plan view for showing a relation between thearc 9 and thearc extinguish grid 10. The arcextinguish grid 10 is made of magnetic material and has anotch 10a for introducing the arc. Because thenotch 10a is formed, lines of magnetic force are deflected as shown in FIG.1B. Therefore, thearc 9 is moved in a direction shown by an arrow A. Referring now to FIG.1A, the arc is moved from 9b to 9f through 9c, 9d and 9e. Themoved arc 9 is stretched, divided and extinguished as described above. - This conventional circuit breaker, however, suffers the following problems.
- When the arc is not smoothly moved and thus moves to a side end of
notch 10a, i.e., to aposition 99 as shown in FIG.1B, thearc 99 stays in this position by emission of thermoelectrons from thearc extinguish grid 10. Especially, such staying of the arc occurres in part S in FIG.1A. Therefore, the arc runs slowly, the extinguishment is delayed and thus breaking efficiency is deteriorated. - When a high voltage is broken or a large current shortcircuit arises, the arc sometimes runs over from the rear end of
grids 10 and makes an arc shortcircuiting 9g, as shown in FIG.1A. - A circuit breaker which discloses all features of the preamble of
claim 1 is known from FR-A-2 348 559. This known circuit breaker comprises an arc extinction means which is also formed by a grid of plates, this grid being disposed in the space above an arc-runner. Furthermore, this known circuit breaker also seems to comprise notches which are formed at the arc introducing end of each plate. The upper end of the uppermost plate of this known circuit breaker, in addition, is covered by an insulating layer and the lower end of the lowermost plate (which faces the arc-runner) also is covered by an insulating layer. These insulating layers preferably are formed like an "U". In a special embodiment, both insulating layers are formed by a kind of band or binding so that the side faces of all plates are covered, too. - By the a.m. construction of that known circuit breaker, it is possible to partially solve the problem discussed with reference to the prior art circuit breaker shown in Figures 1A and 1B, namely the problem of extinguishing the arc as fast as possible in order to increase the breaking efficiency. A detailled analysis of the known circuit breaker has however shown that shortcircuits cannot be avoided under every breaking condition.
- It is therefore the object of the present invention to improve a circuit breaker according to the preamble of
claim 1 in such a way that the breaking efficieny can be improved. - According to the present invention this object is solved by the advantageous measures indicated in
claim 1. - Hence, the circuit breaker of the present invention comprises an insulation film which is formed on both surfaces of each plate either at the area of said arc introducing end or at the area of the opposite end thereof. These advantageous measures improve the breaking efficieny and allow to avoid really any shortcircuit even at high voltages and large currents.
- As has already been mentioned above, the present invention is directed to a circuit breaker in which the arc which is generated during the disconnection of the two contacts is extinguished by means of a grid which is positioned above an arc-runner and which, in addition, comprises a notch which is formed at that end of each plate at which the arc is introduced (i.e. the end which faces the two contacts). In contrast thereto, document EP-A-33 479 discloses a circuit breaker of a somewhat different kind in which the arc extinction is performed by the combination of a so-called "arc motivating assembly" and an arc chute or dionising assembly. This arc motivating assembly consists of two columns which are flanking the contact pairs, wherein each column is composed of small plates of a magnetic material that are spaced from each other by insulating layers; furtheron, the top end of each column comprises a choke covered by an insulating layer. The arc chute consists of a number of double arc plates formed of a sheet of a magnetic and conductive material which is folded to a "U" in which a thin insulating layer is disposed between the arms of the "U". Due to the different construction of the arc extinction means the insulating layer of this known circuit breaker is a functional necessary construction element in order to make sure that the current follows the arms and the curved portions of the "U". Therefore, the purpose of the provision of this insulating layer cannot be compared to the purpose of the insulating layer of the present invention.
- The document FR-A-1 364 473 discloses a circuit breaker wherein caulking protrusions are provided which are inserted into corresponding holes of side plates in order to connect the plates with the side wall. This document, however, does not disclose the provision of any insulating layers.
- In the following, the present invention will be described in more detail with reference to the accompanying drawings, in which:
- FIG.1A is a sectional view of a prior art circuit breaker;
- FIG.1B is a plan view of the arc extinguish grid of the circuit breaker of FIG.1A;
- FIG.2A is a side view of a circuit breaker of a first embodiment of the present invention;
- FIG.2B is a plan view of the embodiment of FIG.2A;
- FIG.2C is a sectional view of the embodiment of FIG.2A;
- FIG.3A is a sectional view of a circuit breaker of another embodiment of the present invention.
- FIG.3B is a plan view of the embodiment of FIG.3A;
- FIG.4A is a side view of a circuit breaker of still another embodiment of the present invention;
- FIG.4B is a plan view of the circuit breaker of Fig.4A;
- FIG.5A is a side view of a circuit breaker of still another embodiment of the present invention; and
- FIG.5B is a plan view thereof.
- FIG.2A shows a preferred embodiment of a circuit breaker embodying the present invention. A
fixed contact 4 and anarc runner 5 are fixed on afixed arm 3. Thefixed arm 3 is fixed by abolt 12, and a foldedtip part 31 of thefixed arm 3 is also fixed by abolt 12. Amovable contact 2 is provided on amovable arm 1.Plates 30 of anarc extinguish grid 30 are fixed toside plates 11 by caulkingprotrusions 50 provided at side part of theplates 30 after inserting theprotrusions 50 into holes of theside plates 11. Theplates 30 of the arc extinguish grid are made of magnetic material and their surfaces are aligned nearly perpendicular to an arc. Aninsulation film 32 covers a front part of both surfaces of eachplate 30. Therefore, eachplate 30 has aninsulation part 32 and ametallic part 34. An arc-proof insulating paint, such as arc-proof epoxy coating paint (Limitrack: trademark of Ryoden Kasei), or liquid ceramic, is suitable for theinsulation film 32. In this embodiment, theinsulation film 32 is formed by dipping thearc plates 30 of the extinguish grid and theside plates 11 into a solution of the arc-proof insulating paint. Theinsulation film 32 covers thearc introducing part 30b of the arc extinguish grid. In addition, when thecaulked parts 50 are also covered with the arc-proof insulating paint, thecaulked parts 50 are prevented from rusting. - There is often a trouble that powder is generated from the edge of each
side plate 11 by vibration of the circuit breaker, this powder causing incomplete connection of contact. Such trouble is prevented by avoiding the generation of the powder by the arc-proof insulating paint. - Referring now to FIG.2A, operation of the circuit breaker is described hereafter. In a closing state, the
movable contact 2 and the fixedcontact 4 are contacting. When an over-current flows in a circuit, themovable contact 2 is disconnected from the fixedcontact 4 by a known releasing device (not shown). At this time, anarc 9a is produced between themovable contact 2 and the fixedcontact 4. - The arc extinguish grid is made of magnetic material such as iron and has a
notch 30a for introducing the arc. Because thenotch 30a is formed, lines of magnetic force are deflected (see FIG.1B). Therefore, thearc 9 is moved in the direction shown by an arrow A. - Even when the arc touches the
insulation part 32 of the extinguish grid, thermoelectrons are not emitted from the arc extinguish grid since the arc-proof insulation film 32 is formed. Therefore, the arc does not stay, but is smoothly moved into themetallic part 34 of arc extinguish grid. When thearc 9 touches themetallic part 34 of the arc extinguish grid, thearc 9 is smoothly quenched. - In another embodiment, after dipping the arc extinguish grid into a solvent, an arc-proof insulating paint is formed to such a predetermined portion that the
side plate 11 only is dipped wholly in the arc-proof insulating paint. In this embodiment, generation of powder from the edge of theside plate 11 due to vibration of the circuit breaker is prevented. - FIG.3A is a sectional view of a circuit breaker of another embodiment, and FIG.3B is a plan view thereof. In this embodiment, the
insulation films 32 are formed in such a manner that the plates of the arc extinguish grid are covered by theinsulation film 32 wider at the part near the arc-runner 5, but narrower at the portion far from the arc-runner 5. - Since those
plates 30 of the arc extinguish grid which are nearer to thearc runner 5 have a higher liability of sticking by the arc than those farther therefrom (as has been described with reference to FIG.1A), the above-mentioned configuration of making theinsulation film 32 wider near the arc-runners 5 than in other portions results in better prevention of the arc-staying at the arc extinguish grid. - FIG.4A is a sectional view of a circuit breaker of still another embodiment which is suitable for high voltage and large current, and FIG.4B is a plan view thereof. In this embodiment, the
insulation films 32 are formed at rear ends of theplates 30 of the arc extinguish grid. - In a closing state, the
movable contact 2 is touching the fixedcontact 4. When an over-current flows in a circuit, themovable contact 2 is disconnected from the fixedcontact 4 by a known releasing device (not shown). At this time, anarc 9 arises between themovable contact 2 and the fixedcontact 4. - The arc extinguish grid is made of magnetic material and has a
notch 30a for introducing the arc. Because thenotch 30a is formed, lines of magnetic force are deflected (see FIG.1B). Therefore, thearc 9 is moved in the direction shown by an arrow A. Finally, thearc 9 is moved into the rear ends of the arc extinguish grid. Because the rear ends of of the plates of the grid are covered by theinsulation film 32, shortcircuiting by an arc at the rear part as 9g in FIG.1A is prevented, and thus superior and stable breaking efficiency is obtainable. - FIG.5A and FIG.5B show still another modified embodiment, wherein the
insulation film 32 covers a limited part behind thenotch 30a of eachplate 30 of the arc extinguish grid. In this embodiment, since a considerablemetallic part 34 is exposed, arc contact time to themetallic part 34 of the arc extinguish grid is longer than that in the embodiment of FIG.4A. Therefore, the cooling and quenching of the arc is very efficient.
Claims (4)
- Circuit breaker, comprising[a] a fixed contact (4) provided on a fixed arm (3);[b] a movable contact (2) provided on an arm (1) which is movable by a releasing means so as to disconnect the two contacts (2, 4);[c] an arc-runner (5) the end of which is fixed to said fixed arm (3); and[d] an arc extinguishing grid positioned in the space above said arc-runner (5) and being formed by a plurality of plates (30) made of magnetic material, the surfaces of which are directed nearly perpendicular to an arc and which comprise a notch (30a) formed at the arc introducing end thereof which faces said two contacts (2, 4);characterized in that[e] an insulation film (32) is formed on both surfaces of each plate (30) either at the area of said arc introducing end or at the area of the opposite end.
- Circuit breaker according to claim 1, characterized in that said insulation film (32) is formed at said arc introducing end, wherein the size of the area of said insulation film (32) is the smaller the more the respective plate (30) is distant from said arc-runner (5).
- Circuit breaker according to claim 1 or 2, characterized in that all plates (30) of said grid are fixed to a pair of side plates (11) by means of caulking protrusions (50) which are inserted into corresponding holes of said side plates (11), wherein said caulking protrusions (50) are also covered by said insulation film.
- Circuit breaker according to one of claims 1 to 3, characterized in that said insulation film (32) is formed by a dip-coat layer.
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP99026/87 | 1987-04-21 | ||
JP9902987A JPS63264843A (en) | 1987-04-21 | 1987-04-21 | Circuit breaker |
JP9902687A JPS63264840A (en) | 1987-04-21 | 1987-04-21 | Circuit breaker |
JP9902887A JPS63264842A (en) | 1987-04-21 | 1987-04-21 | Circuit breaker |
JP99027/87 | 1987-04-21 | ||
JP99029/87 | 1987-04-21 | ||
JP99028/87 | 1987-04-21 | ||
JP9902787A JPS63264841A (en) | 1987-04-21 | 1987-04-21 | Circuit breaker |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0288040A2 EP0288040A2 (en) | 1988-10-26 |
EP0288040A3 EP0288040A3 (en) | 1990-06-13 |
EP0288040B1 true EP0288040B1 (en) | 1994-03-02 |
Family
ID=27468696
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88106330A Expired - Lifetime EP0288040B1 (en) | 1987-04-21 | 1988-04-20 | Circuit Breaker |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0288040B1 (en) |
KR (1) | KR910001537B1 (en) |
DE (1) | DE3888007T2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3748666B1 (en) * | 2018-02-01 | 2023-10-11 | Mitsubishi Electric Corporation | Circuit breaker and circuit breaking method |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH681933A5 (en) * | 1991-03-14 | 1993-06-15 | Secheron Sa | Electrical switch with arc-quenching system - has plate of magnetic material with coupled plate of insulation having cut-away section near to arcing point |
DE19803925A1 (en) * | 1998-02-02 | 1999-08-05 | Maier & Cie C | Electrical installation switch for fitting to current rail in LV distribution network |
DE10242310A1 (en) * | 2001-11-16 | 2003-07-10 | Abb Patent Gmbh | Electric arc extinguishing unit for an electric switch, comprises a housing with upper and lower sections and an extinguishing chamber |
CN1298002C (en) * | 2004-02-06 | 2007-01-31 | 西安交通大学 | Grating arc-extinguishing chamber with gas producing lamination of insulation material |
US9087654B2 (en) * | 2012-12-04 | 2015-07-21 | Larsen & Toubro Limited | Arc chute arrangement for arc quenching in electrical switching device |
EP3933866A1 (en) * | 2020-07-01 | 2022-01-05 | ABB Schweiz AG | A switching apparatus for electric power distribution grids |
CN114284895B (en) * | 2022-01-11 | 2024-06-07 | 华科电工工程股份有限公司 | High-voltage switch cabinet with intelligent voice interaction control system |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL295859A (en) * | 1962-07-27 | |||
DE2419656B2 (en) * | 1974-04-24 | 1978-03-23 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Stack of extinguishing sheets, especially for circuit breakers, which is attached to an insulating material carrier |
DE2616825C3 (en) * | 1976-04-15 | 1981-07-02 | Brown, Boveri & Cie Ag, 6800 Mannheim | Circuit breaker |
IT1129691B (en) * | 1980-01-31 | 1986-06-11 | Elettromeccanica Spa Cge Comp | RAPID EXTINGUISHING COMPLEX OF THE ELECTRIC ARC IN INTERRUPTION DEVICES SUCH AS ELECTRIC SWITCHES |
DE3531040C1 (en) * | 1985-08-30 | 1987-06-04 | Licentia Gmbh | Extinguishing device for an all-current circuit breaker |
-
1988
- 1988-03-26 KR KR1019880003295A patent/KR910001537B1/en not_active IP Right Cessation
- 1988-04-20 EP EP88106330A patent/EP0288040B1/en not_active Expired - Lifetime
- 1988-04-20 DE DE3888007T patent/DE3888007T2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3748666B1 (en) * | 2018-02-01 | 2023-10-11 | Mitsubishi Electric Corporation | Circuit breaker and circuit breaking method |
Also Published As
Publication number | Publication date |
---|---|
DE3888007D1 (en) | 1994-04-07 |
EP0288040A3 (en) | 1990-06-13 |
KR880013202A (en) | 1988-11-30 |
EP0288040A2 (en) | 1988-10-26 |
DE3888007T2 (en) | 1994-06-09 |
KR910001537B1 (en) | 1991-03-15 |
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