EP3979292A1 - Direct-current circuit breaker - Google Patents
Direct-current circuit breaker Download PDFInfo
- Publication number
- EP3979292A1 EP3979292A1 EP20813702.6A EP20813702A EP3979292A1 EP 3979292 A1 EP3979292 A1 EP 3979292A1 EP 20813702 A EP20813702 A EP 20813702A EP 3979292 A1 EP3979292 A1 EP 3979292A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- arc extinguishing
- arc
- plate
- circuit breaker
- interrupting
- 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.)
- Pending
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Classifications
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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
- H01H33/02—Details
- H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
- H01H33/08—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/18—Means for extinguishing or suppressing arc
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- 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
- H01H9/341—Barrier plates carrying electrodes
Definitions
- the interrupting portions 30 are formed on the insulating plates 13 of the arc extinguishing plates 15 in the present embodiment.
- the arc extinguishing plate 15 is disposed such that the surface on which the interrupting portions 30 are formed faces downward as shown in FIG. 4 .
- the interrupting portions 30 are preferably formed in regions in which the grids 12 are disposed on the arc extinguishing plate 15. Specifically, the interrupting portions 30 are preferably formed on the surfaces of the grids 12 stacked on the arc extinguishing plate 15 or at locations that: are present on a surface, of the arc extinguishing plate 15, that is opposite to the surface on which the grids 12 are formed; and correspond to the locations at which the grids 12 are formed.
- FIG. 5 is a modification in which a grid 12 is disposed between the insulating plate 13 and interrupting portions 30. This arrangement also makes it possible to obtain the favorable effect of controlling the arc.
- each interrupting portion 30 having the bent portions disposed so as to face each other have been used.
- an example has been shown in which four interrupting portions 30 originating from edges of the opening at the center and extending to edges on the outer peripheral side are used on one arc extinguishing plate 15.
- the shape of each interrupting portion 30 is not limited to a bent shape and a projecting shape in the form of a line.
Abstract
Description
- The present disclosure relates to a DC circuit breaker having an interrupting portion on an arc extinguishing plate thereof.
- A DC circuit breaker includes: a fixed element having a fixed contact; and a movable element having a movable contact that is separable from the fixed contact.
The DC circuit breaker performs opening between the contacts, to interrupt current. An arc generated in association with the opening is transferred from the contacts onto arc runners disposed in the vicinity of the contacts and is guided into an arc extinguishing chamber. - A plurality of arc extinguishing plates each formed by retaining a grid on an insulating plate are parallelly disposed at fixed intervals in the arc extinguishing chamber. The arc having arrived in the arc extinguishing chamber is divided by the arc extinguishing plates, and an arc voltage equal to or higher than a power supply voltage of a DC circuit is generated, whereby fault current is limited and interrupted.
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- Patent Document 1:
Japanese Laid-Open Patent Publication No. 61-190828 - Patent Document 2:
Japanese Laid-Open Patent Publication No. 62-82616 - In the conventional DC circuit breaker, an arc having arrived on an arc extinguishing plate in the arc extinguishing chamber may flow back in directions toward the contacts during the limitation and the interruption, to cause restrike of an arc. This results in elongation of the time taken to complete interruption and sometimes also leads to failure of interruption.
- Considering this drawback, in
Patent Document 1 andPatent Document 2, an interrupting portion is provided between contacts and arc extinguishing plates in an arc extinguishing chamber. Consequently, hot gases generated by an arc having arrived in the arc extinguishing chamber are prevented from flowing back in directions toward the contacts. Thus, restrike of an arc in the vicinity of the contacts is inhibited. However,Patent Document 1 andPatent Document 2 have the following problem. That is, control of the flowing direction of an arc which has arrived on, and divided by, an arc extinguishing plate, is not sufficient, and thus backflow of the arc sometimes occurs, to cause failure of interruption. - The present disclosure has been made to solve the above problem, and an object of the present disclosure is to obtain a DC circuit breaker in which an interrupting portion for controlling the flow of an arc is provided on each of arc extinguishing plates in an arc extinguishing chamber, and which has so high interruption performance that no arc flows back from a location on a grid.
- A DC circuit breaker according to the present disclosure is a DC circuit breaker including: an interruption mechanism portion configured to perform opening between a fixed contact and a movable contact, to interrupt DC current; an arc extinguishing plate obtained by superposing an insulating plate and a grid which has electrical conductivity and has a plate shape; and an arc extinguishing chamber in which a plurality of the arc extinguishing plates are accommodated in a stacked state at fixed intervals such that edges of the arc extinguishing plates are located above the fixed contact and the movable contact, wherein an interrupting portion having a projecting shape is disposed on either surface of each arc extinguishing plate so as to originate from an edge of the arc extinguishing plate.
- In the DC circuit breaker according to the present disclosure, the interrupting portion is provided on each of the arc extinguishing plates. Thus, it is possible to obtain so high interruption performance that no arc flows back from a location on any of the arc extinguishing plates.
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- [
FIG. 1] FIG. 1 is a schematic cross-sectional view showing the structure of a DC circuit breaker according toembodiment 1. - [
FIG. 2] FIG. 2 is a schematic cross-sectional view showing the structure of the DC circuit breaker according toembodiment 1. - [
FIG. 3] FIG. 3 is a perspective view of arc extinguishing plates on each of which interrupting portions according toembodiment 1 are formed. - [
FIG. 4] FIG. 4 is a perspective view showing the back surface structure of the arc extinguishing plates on each of which the interrupting portions according toembodiment 1 are formed. - [
FIG. 5] FIG. 5 is a partial perspective view showing a modification of the arc extinguishing plate on which the interrupting portions according toembodiment 1 are formed. - [
FIG. 6] FIG. 6 is a perspective view showing the internal structure of an arc extinguishing chamber according toembodiment 1. - [
FIG. 7] FIG. 7 is a conceptual view showing an effect of the interrupting portions according toembodiment 1. - [
FIG. 8] FIG. 8 is a schematic cross-sectional view showing the structure of a DC circuit breaker according toembodiment 1. - [
FIG. 9] FIG. 9 is a conceptual view showing an effect of interrupting portions according toembodiment 1. - [
FIG. 10] FIG. 10 is a perspective view of arc runners on which interrupting portions according toembodiment 2 are formed. - The same or corresponding portions in descriptions of embodiments and the drawings are denoted by the same reference characters.
- The present embodiment will be described mainly with reference to
FIG. 1 to FIG. 7 .FIG. 1 andFIG. 2 are each a schematic cross-sectional view showing the schematic structure of aDC circuit breaker 100 of the present embodiment.FIG. 1 shows a closed state between contacts, andFIG. 2 shows an opened state between the contacts.FIG. 3 is a perspective view showing several ones taken out from among arcextinguishing plates 15 disposed in anarc extinguishing chamber 14 of theDC circuit breaker 100.FIG. 3 shows a state where interruptingportions 30 are formed on the arcextinguishing plates 15 which are each formed by aninsulating plate 13 andgrids 12.FIG. 4 shows the back surface structure inFIG. 3 .FIG. 5 shows a modification of the arrangement of agrid 12. -
FIG. 6 shows the internal structure of thearc extinguishing chamber 14.FIG. 6 shows a structure in which thearc extinguishing plates 15 which are each formed by theinsulating plate 13 and thegrids 12 and on which the interruptingportions 30 are formed, are stacked.FIG. 7 shows the flows, of hot gases, that are controlled by the interruptingportions 30. -
FIG. 1 andFIG. 2 are each a cross-sectional view of theDC circuit breaker 100 of the present embodiment and each show a schematic structure of the device. Of theDC circuit breaker 100 shown in each ofFIG. 1 andFIG. 2 , the lower portion indicates aninterruption mechanism portion 16 and the upper portion indicates thearc extinguishing chamber 14. -
FIG. 1 shows theinterruption mechanism portion 16 in a closed state between the contacts. In this state, amovable element 4 is pressed by aclosing actuator 5 in the leftward direction inFIG. 1 , and amovable contact 3 attached to themovable element 4 is in contact with afixed contact 1 attached to afixed element 2. This enables electric conduction between anupper conductor 6 and alower conductor 7. - In the arc
extinguishing chamber 14 at the upper portion inFIG. 1 , a space is present above thefixed contact 1 and themovable contact 3, and a fixed-side arc runner 10 and a movable-side arc runner 11 are disposed on the left and right sides. Integrated products are disposed so as to be stacked over the fixed-side arc runner 10 and the movable-side arc runner 11. Each integrated product is composed of:grids 12 which have electrical conductivity and have flat plate shapes; aninsulating plate 13 on which thegrids 12 are disposed and retained; and interruptingportions 30 which are each made of resin and each formed in a projecting shape in the form of a line to prevent backflow of hot gases. - In the present embodiment, each member disposed in the arc
extinguishing chamber 14 and composed of thegrids 12 and theinsulating plate 13 is referred to as an arcextinguishing plate 15. Meanwhile, each portion disposed on the arcextinguishing plate 15 and having a projecting shape in the form of a line is referred to as an interruptingportion 30. - In
FIG. 1 , the portion enclosed by the broken line in the arcextinguishing chamber 14 represents the arcextinguishing plate 15. In the arcextinguishing plate 15, thegrids 12 are attached to the upper surface of theinsulating plate 13, and each interruptingportion 30 is further formed on theinsulating plate 13 so as to originate from an edge of the arcextinguishing plate 15. - The interrupting
portion 30 on theinsulating plate 13 can be formed integrally with theinsulating plate 13. Alternatively, the interruptingportion 30 can be formed as a separate member and attached on theinsulating plate 13. - The order of stacking of the interrupting
portion 30, and theinsulating plate 13 and thegrids 12 which compose thearc extinguishing plate 15, is merely an example, and it is also possible to change the order of theinsulating plate 13 and thegrids 12 as described later. In addition, although the interruptingportions 30 are formed on theinsulating plate 13 in the present embodiment, the interruptingportions 30 can be formed on thegrids 12. - It is noted that
FIG. 1 shows a closed state, and thus, in this state, electric conduction is present between thefixed contact 1 and themovable contact 3 and no arc has occurred. A flow at the time of generation of an arc will be described with reference toFIG. 2 and the like. -
FIG. 2 shows theinterruption mechanism portion 16 in an opened state. - When fault current flows through the
interruption mechanism portion 16, adetector 8 disposed on thelower conductor 7 detects the fault current, and alatch 9 retaining themovable element 4 is released by the closingactuator 5. Consequently, themovable element 4 retaining themovable contact 3 is moved. Thus, opening occurs between thefixed contact 1 and themovable contact 3 in a state where current is being applied. At the time of the opening, anarc 20 is generated between thefixed contact 1 and themovable contact 3. It is noted that the stage in which thearc 20 is generated in the opened state is referred to as emergence and is, in some cases, distinguished from other stages of thearc 20. - The
arc 20 having emerged between the contacts moves between the fixed-side arc runner 10 and the movable-side arc runner 11. This stage is referred to as transference of anarc 21. Then, thearc 21 moves into thearc extinguishing chamber 14 owing to influences of: electromagnetic forces generated by currents flowing through the fixed-side arc runner 10 and the movable-side arc runner 11; and the flows of electrically conductive hot gases. This stage is referred to as travel of anarc 22. - The
arc 22 having travelled into thearc extinguishing chamber 14 arrives at intervals between thearc extinguishing plates 15. The stage in which the arc is divided between the plurality ofarc extinguishing plates 15 may be referred to as division of anarc 23. If the divided state is maintained, an arc voltage increases to become equal to or higher than a power supply voltage of a circuit. Consequently, limitation and interruption are performed. - In the present embodiment, the interrupting
portions 30 are, as shown inFIG. 2 , formed on surfaces of the insulatingplates 13 of thearc extinguishing plates 15 so as to originate from edges of thearc extinguishing plates 15 in order to prevent thearc 23 from flowing back from the intervals between thearc extinguishing plates 15 and prevent restrike of an arc due to hot gases. - Hereinafter, the arrangement, the structures, functions, and the like of the interrupting
portions 30 will be described with reference toFIG. 3 to FIG. 7 . -
FIG. 3 illustrates the arrangement and the structures of the interruptingportions 30 formed on the insulatingplates 13 of thearc extinguishing plates 15. Some of the plurality ofarc extinguishing plates 15 disposed in thearc extinguishing chamber 14 have been taken out and shown. -
FIG. 4 shows the back surface structure inFIG. 3 .FIG. 5 shows a modification of the structure of thearc extinguishing plate 15, in which the arrangement of agrid 12 is changed. -
FIG. 6 shows a schematic structure of thearc extinguishing plates 15 disposed in thearc extinguishing chamber 14 and partially shows, together with the schematic structure, the fixed-side arc runner 10, the movable-side arc runner 11, and the like. - As shown in
FIG. 6 , the interruptingportions 30 are formed on the insulatingplates 13 of thearc extinguishing plates 15 in the present embodiment. When eacharc extinguishing plate 15 is disposed in thearc extinguishing chamber 14, thearc extinguishing plate 15 is disposed such that the surface on which the interruptingportions 30 are formed faces downward as shown inFIG. 4 . - It is noted that
FIG. 3 shows that the insulatingplate 13 side on which the interruptingportions 30 are formed faces upward for facilitating explanations. - Although each
arc extinguishing plate 15 is composed of thegrids 12 and the insulatingplate 13 and has a structure in which the interruptingportions 30 are formed, nogrids 12 can be viewed inFIG. 6 owing to the view angle. - In
FIG. 3 , a quadrangular opening in which the travelingarc 22 flows is formed at the center of each insulatingplate 13. Thegrids 12 are stacked so as to protrude into the opening. As shown inFIG. 1 andFIG. 2 , the opening is located directly above the fixedcontact 1 and themovable contact 3. That is, as shown inFIG. 2 , thearc 20 generated owing to an opening operation between thefixed contact 1 and themovable contact 3 flows into the opening owing to the flows of hot gases and electromagnetic forces of the fixed-side arc runner 10 and the movable-side arc runner 11. Then, the arc arrives at the intervals between thearc extinguishing plate 15, whereby the arc is divided by thegrids 12 disposed on thearc extinguishing plates 15. - As shown in
FIG. 3 , each interruptingportion 30 is disposed in the form of a line and has a projecting shape. The interruptingportion 30 is attached to the insulatingplate 13 by bringing side surfaces of the projecting-shape portion into close contact with the insulatingplate 13. Further, the interruptingportion 30 is disposed substantially in a radial pattern so as to originate from an edge of the quadrangular opening formed at the center of the insulatingplate 13 of eacharc extinguishing plate 15 and so as to face the outer side of the insulatingplate 13 and extend to an edge on the outer peripheral side of thearc extinguishing plate 15. - Regarding the locations at which the interrupting
portions 30 are to be formed, the interruptingportions 30 are preferably formed in regions in which thegrids 12 are disposed on thearc extinguishing plate 15. Specifically, the interruptingportions 30 are preferably formed on the surfaces of thegrids 12 stacked on thearc extinguishing plate 15 or at locations that: are present on a surface, of thearc extinguishing plate 15, that is opposite to the surface on which thegrids 12 are formed; and correspond to the locations at which thegrids 12 are formed. - Further, if the interrupting
portions 30 are disposed so as to originate from regions in which thegrids 12 protrude into the quadrangular opening in thearc extinguishing plate 15 shown inFIG. 3 , an effect of controlling arcs can be improved. - The thickness of each interrupting
portion 30 takes the same value as the thickness of each of thegrids 12 and the insulatingplate 13 so as not to inflict any great influence on the stacking structure when thearc extinguishing plates 15 are disposed in thearc extinguishing chamber 14 in a mutually stacked manner. - Detailed effects of each interrupting
portion 30 exhibited when the dividedarc 23 flows into the intervals between thearc extinguishing plates 15, will be described later. Since the interruptingportion 30 is disposed in a radial pattern so as to face the outer side of the insulatingplate 13, the interruptingportion 30 is advantageous in diffusing hot gases. In addition, the interruptingportions 30 are each bent at an obtuse angle and have bent portions disposed so as to face each other. Thus, projecting portions at the bent portions make it possible to prevent backflow of hot gases. Therefore, re-emergence of an arc can be prevented. -
FIG. 4 shows the back surface structure of thearc extinguishing plates 15 shown inFIG. 3 . In the structure, projecting portions are formed at center portions in the longitudinal direction of thearc extinguishing plates 15 at which nogrids 12 are disposed. The effect of controlling thearc 23 is small in the case of using only these projecting portions. However, if the projecting portions are used in combination with the interruptingportions 30 shown inFIG. 3 , a favorable effect of controlling the arc can be expected. -
FIG. 5 is a modification in which agrid 12 is disposed between the insulatingplate 13 and interruptingportions 30. This arrangement also makes it possible to obtain the favorable effect of controlling the arc. -
FIG. 7 shows the flows of hot gases and thearc 22 having travelled to the intervals between thearc extinguishing plates 15. An effect of each interruptingportion 30 on thearc 23 divided by thearc extinguishing plates 15, will be described with reference toFIG. 7 . Similarly toFIG. 3 ,FIG. 7 also shows, for explanations, the state in which the surface of the insulatingplate 13 of eacharc extinguishing plate 15 on which the interruptingportions 30 are formed faces upward. It is noted that the dividedarc 23 spreads in all directions such that, since the shape of the insulatingplate 13 of thearc extinguishing plate 15 is symmetric about the quadrangular opening at the center, the diffusion of thearc 23 also has symmetry. Considering this, description will be given with the direction being limited to one direction, for facilitating explanations. - The
arc 20 having emerged upon the opening between thefixed contact 1 and themovable contact 3 moves and travels into the quadrangular opening portion at the center inFIG. 7 . Thearc 22 having travelled past the fixed-side arc runner 10 and the movable-side arc runner 11 is influenced by the flows of hot gases and the electromagnetic forces of thegrids 12 of thearc extinguishing plate 15 and moves along thewhite arrow 32 which indicates the travel of thearc 22 inFIG. 7 . Consequently, thearc 22 turns into a dividedarc 23. - Further, hot gases generated by the
arc 23 and having high electrical conductivity move along the surface of thearc extinguishing plate 15 and are diffused in a radial pattern, as indicated by theblack arrows 31 which indicate the flows of the hot gases. - If no interrupting
portion 30 is disposed on the insulatingplate 13, parts of the diffused hot gases may pass around from sides and may move again in directions toward the center of thearc extinguishing plate 15. In this case, a situation in which restrike of an arc or the like occurs is also conceivable. However, as shown inFIG. 7 , the interruptingportions 30 which have projecting shapes in the forms of lines bent at obtuse angles and which have the bent portions facing each other are formed on the insulatingplate 13 of thearc extinguishing plate 15 so as to originate from edges of the opening at the center and so as to extend to edges on the outer peripheral side of thearc extinguishing plate 15. Thus, hot gases are diffused as indicated by theblack arrows 31, and a hot gas passing around from a side is received by one of the bent portions, whereby the hot gas can be diffused in a radial pattern to the outer side of thearc extinguishing plate 15. - By the above features, backflow of the hot gases generated owing to the divided
arc 23 can be prevented, and the hot gases can be diffused to the outer side of thearc extinguishing plate 15. Therefore, the hot gases can be ejected to the vicinity of a housing of thearc extinguishing chamber 14. Consequently, restrike of an arc can be prevented, and an interruption characteristic of theDC circuit breaker 100 can be improved. - In the
present embodiment 1, each interruptingportion 30 having a bent shape is formed on the lower surface of the insulatingplate 13 with use of the same resin material as that of the insulatingplate 13. However, the present disclosure is not limited thereto. The same advantageous effects can be obtained also by making an interruptingportion 30 having a linear or bent projecting shape with use of a different insulating material and attaching the interruptingportion 30 to the insulatingplate 13 by pasting or screwing. - In addition, although a configuration in which the interrupting
portions 30 are attached to the lower surface of the insulatingplate 13 of eacharc extinguishing plate 15 has been described in the present embodiment, the same advantageous effects can be obtained even when an interruptingportion 30 having a linear or bent projecting shape is formed on the upper surface of the insulatingplate 13. - In addition, although each interrupting
portion 30 is formed on the insulatingplate 13 with use of an insulating material in thepresent embodiment 1, it is also possible to: form an interruptingportion 30 having a linear or bent projecting shape on eachgrid 12 of thearc extinguishing plate 15 with use of a metal material; and bring side surfaces of the interruptingportion 30 into close contact with the grid by welding to fix the interruptingportion 30. Alternatively, the interruptingportion 30 can be formed also by half-blanking thegrid 12 through press working. - Further, although the
arc extinguishing chamber 14 in which eacharc extinguishing plate 15 composed of the insulatingplate 13 and thegrids 12 is disposed horizontally has been used in thepresent embodiment 1, the same advantageous effects can be obtained by forming the interruptingportions 30 on the insulatingplate 13 or thegrids 12 in the same manner, also in anarc extinguishing chamber 14 in which eacharc extinguishing plate 15 composed of the insulatingplate 13 and thegrids 12 is disposed in the vertical direction as in aDC circuit breaker 101 shown in a cross-sectional view inFIG. 8 . -
FIG. 9 shows the flows of hot gases and anarc 22 having travelled to the intervals between thearc extinguishing plates 15 disposed in the vertical direction. - An
arc 20 having emerged upon opening between thefixed contact 1 and themovable contact 3 moves and travels into the opening portion at the center inFIG. 9 . Thearc 22 is influenced by the flows of hot gases and the electromagnetic forces of thegrids 12 of eacharc extinguishing plate 15 and moves along thewhite arrow 32 which indicates the travel of thearc 22 inFIG. 9 . Consequently, thearc 22 turns into a dividedarc 23. - Further, hot gases generated by the
arc 23 and having high electrical conductivity can be moved along the surface of thearc extinguishing plate 15 and diffused in a radial pattern, as indicated by theblack arrows 31 which indicate the flows of the hot gases. - In the
present embodiment 1, the interruptingportions 30 having the bent portions disposed so as to face each other have been used. In addition, an example has been shown in which four interruptingportions 30 originating from edges of the opening at the center and extending to edges on the outer peripheral side are used on onearc extinguishing plate 15. However, since the important point about the interruptingportions 30 formed on thearc extinguishing plate 15 is to move hot gases to the outer side, the shape of each interruptingportion 30 is not limited to a bent shape and a projecting shape in the form of a line. Specifically, a cylindrical shape, a prismatic shape, or the like having proportions that greatly differ in the longitudinal direction and the lateral direction may be employed, and the interruptingportion 30 does not necessarily have to be so long as to extend to an edge on an outer peripheral side. Furthermore, the number of the interruptingportions 30 is also not limited to four and only has to be one or more. - In
embodiment 1, an example has been shown in which: the plurality ofarc extinguishing plates 15 each obtained by superposing the insulatingplate 13 and thegrids 12 are disposed in thearc extinguishing chamber 14; and the interruptingportions 30 are formed on a surface of the insulatingplate 13 or eachgrid 12. - The present embodiment is basically the same as
embodiment 1 in that each interruptingportion 30 is formed so as to originate from an edge of the opening at the center. Meanwhile, the present embodiment is characterized in that interruptingportions 33 are formed so as to be in contact with side surfaces of the fixed-side arc runner 10 and the movable-side arc runner 11. -
FIG. 10 is a perspective view of anarc extinguishing plate 15 at a lowermost stage connected to the fixed-side arc runner 10 and the movable-side arc runner 11.FIG. 10 shows a state where themovable contact 3, themovable element 4, and theupper conductor 6 are disposed beneath the arc runners. - The fixed-
side arc runner 10 and the movable-side arc runner 11 are fixed to a surface of thearc extinguishing plate 15 such that a part of each arc runner protrudes to the said surface. The interruptingportions 33 having bent shapes are disposed in a radial pattern on the surface of the insulatingplate 13 such that end portions of the interruptingportions 33 are connected to the protruding portions of the arc runners. - An
arc 20 having emerged upon opening between themovable contact 3 and the fixed contact (not shown) is transferred between the arc runners, and anarc 22 having travelled to a location on thearc extinguishing plate 15 at the lowermost stage shown inFIG. 10 moves in a direction toward the outer periphery owing to the flows of hot gases and electromagnetic force of eachgrid 12 in the same manner as inFIG. 7 . Consequently, thearc 22 turns into a dividedarc 23. Further, thearc 23 generates hot gas having high electrical conductivity which is prevented by the interruptingportion 33 from flowing back, to be diffused in a radial pattern in the direction toward the periphery of the insulatingplate 13 of thearc extinguishing plate 15. - By the above features, backflow of the hot gases generated owing to the divided
arc 23 can be prevented, and the hot gases can be diffused to the outer side of the insulatingplate 13 of thearc extinguishing plate 15. Therefore, the hot gases can be ejected to the vicinity of the housing of thearc extinguishing chamber 14. Further, in the present embodiment, a region in the vicinity of each arc runner is a region in which thearc 22 travels at high speed, and thus the effect of preventing the backflow can also be notably obtained. Consequently, restrike of an arc can be prevented, and the interruption characteristic of theDC circuit breaker 100 can be improved. - In the present embodiment, an example has been shown in which the interrupting
portions 33 are formed on the insulatingplate 13, at the lowermost stage in thearc extinguishing chamber 14, which is connected to the arc runners. However, the present disclosure is not limited thereto, and the same advantageous effects can be obtained also by forming the interruptingportions 33 on thegrids 12. - In addition, the disposition locations for the interrupting
portions 33 are not limited to such locations that the interruptingportions 33 are in contact with side surfaces of the arc runners, and only has to be locations near the arc runners. Thus, the same advantageous effects are exhibited also by forming the interruptingportions 33 on the inner wall of thearc extinguishing chamber 14 retaining the fixedelement 2 and themovable element 4 or on a frame portion forming a circuit breaker body. - In addition, if the interrupting
portions 30 formed on thearc extinguishing plate 15 disposed in thearc extinguishing chamber 14 described inembodiment 1 and the interruptingportions 33 disposed on thearc extinguishing plate 15 at the lowermost stage described in the present embodiment so as to be in contact with the side surfaces of the arc runners are used together, restrike of an arc can be further prevented, and the interruption characteristic of theDC circuit breaker 100 can be improved. - Although the disclosure is described above in terms of various exemplary embodiments and implementations, it should be understood that the various features, aspects, and functionality described in one or more of the individual embodiments are not limited in their applicability to the particular embodiment with which they are described, but instead can be applied, alone or in various combinations to one or more of the embodiments of the disclosure.
- It is therefore understood that numerous modifications which have not been exemplified can be devised without departing from the technical scope of the specification of the present disclosure. For example, at least one of the constituent parts may be modified, added, or eliminated. At least one of the constituent parts mentioned in at least one of the preferred embodiments may be selected and combined with the constituent parts mentioned in another preferred embodiment.
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- 1
- fixed contact
- 2
- fixed element
- 3
- movable contact
- 4
- movable element
- 5
- closing actuator
- 6
- upper conductor
- 7
- lower conductor
- 8
- detector
- 9
- latch
- 10
- fixed-side arc runner
- 11
- movable-side arc runner
- 12
- grid
- 13
- insulating plate
- 14
- arc extinguishing chamber
- 15
- arc extinguishing plate
- 16
- interruption mechanism portion
- 20 to 23
- arc
- 30
- interrupting portion
- 33
- interrupting portion
- 100, 101
- DC circuit breaker
Claims (13)
- A DC circuit breaker comprising:an interruption mechanism portion configured to perform opening between a fixed contact and a movable contact, to interrupt DC current;an arc extinguishing plate obtained by superposing an insulating plate and a grid which has electrical conductivity and has a plate shape; andan arc extinguishing chamber in which a plurality of the arc extinguishing plates are accommodated in a stacked state at fixed intervals such that edges of the arc extinguishing plates are located above the fixed contact and the movable contact, whereinan interrupting portion having a projecting shape is disposed on either surface of each arc extinguishing plate so as to originate from an edge of the arc extinguishing plate.
- The DC circuit breaker according to claim 1, wherein a plurality of the interrupting portions are disposed mutually in a radial pattern.
- The DC circuit breaker according to claim 2, wherein the plurality of the interrupting portions are disposed on a surface of the grid formed on each arc extinguishing plate or an opposite surface, of the arc extinguishing plate, that corresponds to a region in which the grid is formed.
- The DC circuit breaker according to claim 3, whereina projecting portion is disposed in addition to the interrupting portions, andthe projecting portion is disposed in a region, on the arc extinguishing plate, in which the grid is not formed.
- The DC circuit breaker according to claim 2, wherein each arc extinguishing plate is accommodated in the arc extinguishing chamber such that a surface of the arc extinguishing plate is oriented in a horizontal direction.
- The DC circuit breaker according to claim 5, whereinthe arc extinguishing plate has an opening at a center portion thereof,an edge, of the arc extinguishing plate, that delimits the opening is located above the fixed contact and the movable contact, andthe plurality of the interrupting portions are disposed mutually in a radial pattern so as to originate from the edges.
- The DC circuit breaker according to claim 6, wherein the plurality of the interrupting portions have shapes of bent lines and are disposed such that bent portions thereof face each other.
- The DC circuit breaker according to claim 2, wherein each arc extinguishing plate is accommodated in the arc extinguishing chamber such that a surface of the arc extinguishing plate is oriented in a vertical direction.
- A DC circuit breaker comprising:an interruption mechanism portion configured to perform opening between a fixed contact and a movable contact, to interrupt DC current;an arc extinguishing plate obtained by superposing an insulating plate and a grid which has electrical conductivity and has a plate shape, the arc extinguishing plate having a surface oriented in a horizontal direction; andan arc extinguishing chamber in which the arc extinguishing plate has an opening at a center portion thereof, and a plurality of the arc extinguishing plates are accommodated in a stacked state at fixed intervals such that edges that delimit the openings are located above the fixed contact and the movable contact, whereina fixed-side arc runner and a movable-side arc runner which are fixed and protrude from the opening of the arc extinguishing plate at a lowermost stage, have side surfaces on which an interrupting portion having a projecting-shape side surface brought into close contact with a surface of the arc extinguishing plate is disposed such that ends of the interrupting portion are in contact with the side surfaces of the fixed-side arc runner and the movable-side arc runner.
- The DC circuit breaker according to any one of claims 1 to 9, wherein the interrupting portion is made of a same resin as a resin of the insulating plate.
- The DC circuit breaker according to any one of claims 1 to 9, wherein the interrupting portion is made through a step of half-blanking a grid made of metal.
- The DC circuit breaker according to any one of claims 1 to 9, wherein
the interrupting portion is made of metal and attached to either surface of each arc extinguishing plate by welding. - The DC circuit breaker according to any one of claims 1 to 9, wherein the interrupting portion is attached to either surface of each arc extinguishing plate by screwing.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP23151994.3A EP4187572A1 (en) | 2019-05-28 | 2020-05-20 | Direct-current circuit breaker |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2019099017 | 2019-05-28 | ||
PCT/JP2020/019864 WO2020241397A1 (en) | 2019-05-28 | 2020-05-20 | Direct-current circuit breaker |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP23151994.3A Division EP4187572A1 (en) | 2019-05-28 | 2020-05-20 | Direct-current circuit breaker |
Publications (2)
Publication Number | Publication Date |
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EP3979292A1 true EP3979292A1 (en) | 2022-04-06 |
EP3979292A4 EP3979292A4 (en) | 2022-10-19 |
Family
ID=73552206
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20813702.6A Pending EP3979292A4 (en) | 2019-05-28 | 2020-05-20 | Direct-current circuit breaker |
EP23151994.3A Pending EP4187572A1 (en) | 2019-05-28 | 2020-05-20 | Direct-current circuit breaker |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
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EP23151994.3A Pending EP4187572A1 (en) | 2019-05-28 | 2020-05-20 | Direct-current circuit breaker |
Country Status (3)
Country | Link |
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EP (2) | EP3979292A4 (en) |
JP (1) | JP6890732B2 (en) |
WO (1) | WO2020241397A1 (en) |
Families Citing this family (3)
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CN114360979A (en) * | 2021-12-17 | 2022-04-15 | 北京中车赛德铁道电气科技有限公司 | Arc extinguishing grid structure |
FR3131798A1 (en) * | 2022-01-10 | 2023-07-14 | Alstom Holdings | Arc fragmentation and extinguishing fireback and fireplace including it |
WO2023136528A1 (en) * | 2022-01-13 | 2023-07-20 | 엘에스일렉트릭 (주) | Arc extinguishing unit of molded case circuit breaker |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU773788A1 (en) * | 1978-04-28 | 1980-10-23 | Институт высоких температур АН СССР | Fuse |
JPS56162579A (en) * | 1980-05-19 | 1981-12-14 | Sanyo Electric Co Ltd | Magnetic video recording and reproducing method |
JPS6282616A (en) | 1985-10-08 | 1987-04-16 | 寺崎電気産業株式会社 | Arc extinguisher |
JPS61190828A (en) | 1986-02-03 | 1986-08-25 | 株式会社日立製作所 | Circuit breaker |
JPS63108623A (en) * | 1986-06-03 | 1988-05-13 | 三菱電機株式会社 | Switch |
JPS63257138A (en) * | 1987-04-13 | 1988-10-25 | 三菱電機株式会社 | Arc distinguisher for circuit breaker |
JP3263969B2 (en) * | 1992-04-10 | 2002-03-11 | 株式会社明電舎 | DC high speed circuit breaker |
JP4231642B2 (en) * | 2001-11-29 | 2009-03-04 | エナジーサポート株式会社 | Arc extinguishing device |
KR101808029B1 (en) * | 2010-04-16 | 2018-01-18 | 에이비비 슈바이쯔 아게 | Switch unit, method for assembling a switch unit, and circuit breaker for a medium voltage circuit |
CN105470067A (en) * | 2015-12-29 | 2016-04-06 | 浙江天正电气股份有限公司 | Breaker provided with arc extinguishing mechanism with magnetic blowing and air-blowing functions |
JP6516078B1 (en) * | 2018-02-01 | 2019-05-22 | 三菱電機株式会社 | Circuit breaker and circuit breaker method |
-
2020
- 2020-05-20 WO PCT/JP2020/019864 patent/WO2020241397A1/en unknown
- 2020-05-20 EP EP20813702.6A patent/EP3979292A4/en active Pending
- 2020-05-20 EP EP23151994.3A patent/EP4187572A1/en active Pending
- 2020-05-20 JP JP2020563576A patent/JP6890732B2/en active Active
Also Published As
Publication number | Publication date |
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JPWO2020241397A1 (en) | 2021-09-13 |
EP4187572A1 (en) | 2023-05-31 |
WO2020241397A1 (en) | 2020-12-03 |
JP6890732B2 (en) | 2021-06-18 |
EP3979292A4 (en) | 2022-10-19 |
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