JP7068033B2 - Arc extinguishing device for DC high speed circuit breaker - Google Patents

Description

This application relates to the structure of an arc extinguishing device for a DC high speed circuit breaker.

In a DC high-speed circuit breaker, a stator having a fixed contact, a mover having a movable contact that can be attached to and detached from the stator, an arc runner that transfers an arc generated between the contacts from the contact, and an arc extinguishing the arc. It has an arc extinguishing chamber. The arcranner is placed near the stator and the mover, respectively, and the arc that drives the arc runner enters the grids arranged in multiple arc extinguishing chambers and is divided to generate an arc voltage higher than the power supply voltage of the DC circuit. The current limit is cut off at.

Japanese Unexamined Patent Publication No. 2016-085831 Japanese Unexamined Patent Publication No. 2014-238934 Japanese Patent No. 6203428

In the conventional DC high-speed circuit breaker, as in Patent No. 6203428 (Patent Document 3), a large number of grids of the arc extinguishing chamber are arranged side by side at predetermined intervals in one direction. There is a tendency to increase the size, but for example, in a DC high-speed circuit breaker housed in a switchgear that is required to be miniaturized, the arc extinguishing chamber is required to be miniaturized in order to reduce the storage space.
As an example of miniaturizing a DC circuit breaker, in the arc extinguishing device of the circuit circuit breaker disclosed in JP-A-2016-085831 (Patent Document 1) and JP-A-2014-238934 (Patent Document 2), between the movable contact and the fixed contact. By arranging an intermediate runner that divides the arc generated in, and by providing multiple arc extinguishing chambers that extinguish the divided arcs individually, the arc extinguishing chambers can be arranged in parallel, so the arc extinguishing chamber can be miniaturized. There is.

However, in the above-mentioned arc extinguishing chamber structure, it is necessary to drive the divided arcs into the arc extinguishing chambers arranged in parallel, but the driving direction is the electromagnetic force to the arc generated by the mover, the stator and the arc runner. It is not in the same direction as the driving direction due to. Therefore, the arc drive to the arc extinguishing chamber after splitting the arc in the intermediate runner depends only on the contact and the flow of the conductive hot gas generated in the arc runner, so that the arc is driven quickly and is high. There was a problem that it was difficult to secure the current limiting performance. Further, it is difficult to increase the breaking capacity in the circuit breaker structure disclosed in Patent Document 1 and Patent Document 2, and it is difficult to apply it as it is to a large-capacity circuit breaker such as a DC high-speed circuit breaker. rice field.

This application discloses a technique for solving the above-mentioned problems, and in a DC high-speed circuit breaker having a larger capacity than the DC circuit breaker disclosed in the above patent document and performing high-speed circuit breaker. The purpose is to obtain a DC high-speed circuit breaker that can reduce the size of the arc extinguishing chamber while enabling a large-capacity circuit breaker.

The arc extinguishing device of the DC high-speed breaker disclosed in this application includes a stator having a fixed contact, a mover having a movable contact that can be connected to and detached from the fixed contact, and an arc generated when the contact is opened. A fixed-side arc runner that transfers an arc from the fixed contact, a movable-side arc runner that transfers an arc from the movable contact, and the fixed-side arc runner and the movable-side arc runner facing each other. An intermediate runner for dividing the arc into a plurality of parts is provided , and the arc traveling portion of the fixed side arc runner, the arc traveling portion of the movable side arc runner, and the arc traveling portion of the intermediate runner are respectively extended in the horizontal direction. A plurality of arc-extinguishing chambers are provided in which magnetic grids for extinguishing the arc divided by the intermediate runner are arranged in one direction at predetermined intervals, and the plurality of arc-extinguishing chambers are in the extension direction of the arc. Are arranged in parallel with each other so as to face above the DC high-speed breaker.
Further, the arc extinguishing device of the DC high-speed breaker disclosed in this application is generated when a stator having a fixed contact, a mover having a movable contact that can be connected to and detached from the fixed contact, and a contact pole are opened. The fixed arc runner that transfers the arc from the fixed contact to drive the arc to the arc extinguishing chamber, the movable arc runner that transfers the arc from the movable contact, and the fixed arc runner and the movable arc runner. A plurality of arc extinguishing arcs provided so as to face each other and provided with an intermediate runner for dividing the arc into a plurality of arcs, and magnetic grids for extinguishing the arcs divided by the intermediate runners are arranged in one direction at predetermined intervals. Along with providing chambers, the plurality of arc extinguishing chambers are arranged in parallel with each other so that the arc extension direction is directed above the DC high-speed breaker, and the intermediate runner has a slit at a position where the extension direction changes of the intermediate runner. It is provided.

According to the arc extinguishing device of the DC high speed circuit breaker disclosed in this application, a plurality of arc extinguishing chambers in which magnetic grids for extinguishing an arc divided by an intermediate runner are arranged in one direction at predetermined intervals are provided. By arranging the arcs in parallel with each other so that the extension direction of the arc is directed toward the upper side of the DC high-speed circuit breaker, the height of the circuit breaker can be made low.

The vertical sectional view which shows the outline of the whole structure of the DC high speed circuit breaker which concerns on Embodiment 1. The perspective view which shows the arc extinguishing apparatus of the DC high speed circuit breaker which concerns on Embodiment 1. (A) side view and (b) top view of the arc extinguishing device portion shown in FIG. A perspective view showing a fixed side arc runner, a movable side arc runner, and an intermediate runner. (A) side view and (b) perspective view showing only the contact portion and each arc runner for explaining the movement of the arc. Front view of the contact opening / closing part of the intermediate runner showing the effect of the slit of the intermediate runner on the arc drive. The perspective view which shows the arc runner structure which concerns on Embodiment 2. The perspective view which shows the intermediate runner structure which concerns on Embodiment 3. 3 is a three-view view showing the arc runner structure of FIG. 4A according to the first embodiment. 3 is a three-view view showing the intermediate runner structure of FIG. 4B according to the first embodiment. 3 is a three-view view showing the arc runner structure of FIG. 7 according to the second embodiment. 3 is a three-view view showing the intermediate runner structure of FIG. 8 according to the third embodiment.

Embodiment 1.
The first embodiment will be described with reference to FIGS. 1 to 6 and FIGS. 9 and 10. 1 is a vertical sectional view showing an outline of the entire configuration of the DC high-speed circuit breaker according to the first embodiment, FIG. 2 is a perspective view showing an arc extinguishing device of the DC high-speed circuit breaker, and FIG. 2A is a partition wall. 2 (b) is a diagram in which the partition wall is hidden. FIG. 3A shows a side view of the arc extinguishing device portion shown in FIG. 2, and FIG. 3B shows a top view. 4A and 4B show the arc runner of the first embodiment, FIG. 4A is a perspective view showing a fixed side arcrunner and a movable side arcrunner, and FIG. 4B is a perspective view showing an intermediate runner.

First, the DC high-speed circuit breaker according to the first embodiment will be described. A DC high-speed circuit breaker (hereinafter referred to as a circuit breaker) is provided with a stator 2 having a fixed contact 1 and a mover 4 having a movable contact 3 that can be connected to and detached from the stator 2 when a current is applied. By moving in the direction of the stator 2 by the actuator 5 and making contact with the stator 2, a current is passed through the upper conductor 6 and the lower conductor 7.
When the fault current flows during the current cutoff, the detector 8 arranged on the lower conductor 7 operates by detecting the fault current, and the mover 4 is released by releasing the latch 9 holding the mover 4. Dissociates from the stator 2 and an opening operation is performed.

When the pole opening operation is performed when the current is cut off, an arc is generated between the fixed contact 1 and the movable contact 3 (hereinafter referred to as an arc). The arc generated between the contacts 1 and 3 jumps and is transferred to the fixed-side arc runner 10 arranged in the vicinity of the stator 2 and the movable-side arc runner 11 arranged in the vicinity of the mover 4. Called flow). After that, in order to divide at the central portion of the arc generated between the fixed side arc runner 10 and the movable side arc runner 11, commutation to the intermediate runner 12 arranged in the middle of each of the arc runners 10 and 11 is performed. As a result, one arc generated between the fixed-side arc runner 10 and the movable-side arc runner 11 is divided into two arcs via the intermediate runner 12.
Further, as shown in FIG. 2, the upper part of the intermediate arc runner 12 is provided with a partition wall 18 for preventing the bridge of the divided arcs, and the arc extinguishing chambers 14A and the arc extinguishing chambers 14B are provided on the left and right sides with the partition wall 18 as the center. Have been placed.

The divided arcs are formed by the electromagnetic force generated by the current flowing through the fixed side and movable side arc runners 10 and 11 and the intermediate arc runner 12, and the flow of the conductive hot gas generated at the time of firing and the like, respectively. , 12 travel in the traveling path AR in a direction away from the contacts 1 and 3, and are driven to the vicinity of the grid 13 made of a thin plate-shaped magnetic material.
The grid 13 is laminated with an insulating plate spacer (not shown) alternately in one direction (upward of the display surface in FIG. 1) at regular intervals to form an arc extinguishing chamber 14 composed of arc extinguishing chambers 14A and 14B. Then, the arc traveling to the vicinity of the grid 13 enters the grid group consisting of a plurality of grids 13 arranged in a certain direction at a certain predetermined interval and is divided, so that the arc voltage rises and direct current is applied. When the voltage exceeds the power supply voltage of the circuit, the current limiting cutoff is performed.

FIG. 4A shows a perspective view of the fixed side and movable side arc runners, and FIG. 4B shows a perspective view of the intermediate runner. The fixed-side arc runner 10 and the movable-side arc runner 11 are bent so that they can be guided in the directions of the arc-extinguishing chambers 14A and 14B in order to drive the arc to the respective arc-extinguishing chambers 14A and 14B after the arc is divided by the intermediate runner 12. It has a structure. Similarly, the intermediate runner 12 also has a curved structure so that it can be guided in the direction of the arc extinguishing chambers 14A and 14B from the U-shaped bending point 15 at the lower part of the runner where the arc is commutated.
A three-view view of the fixed-side and movable-side arc runners corresponding to FIG. 4A is shown in FIG. 9, and a three-view view of the intermediate runner corresponding to FIG. 4B is shown in FIG. 9 (a) is a top view of the fixed side and movable side arc runners 10 and 11, FIG. 9 (b) is an end view, and FIG. 9 (c) is a side view. 10 (a) is a top view of the intermediate runner 12, FIG. 9 (b) is an end view, and FIG. 9 (c) is a side view.

5A and 5B are views showing only the contact portion and each arc runner for explaining the movement of the arc from the arc to the cutoff, FIG. 5A is a side view, and FIG. 5B is a perspective view. The generated arc 16A is commutated to the runners 10 and 11 to be in the state of the arc 16B, and by commutating to the intermediate runner 12, the arc 16C between the fixed side arc runner 10 and the intermediate runner 12 and the movable side arc runner 11 and the intermediate runner 12 are formed. It is divided into arcs 16D between twelve. Then, as described above, the arc 16C is driven by the electromagnetic force and the hot gas along the fixed side arc runner 10 and the intermediate runner 12 in the direction of the fixed side arc extinguishing chamber 14A shown in FIG. 3 (b) (direction 17A in FIG. 5). Then, the arc is extinguished in the fixed side arc extinguishing chamber 14A, and the arc 16D is driven toward the movable side arc extinguishing chamber 14B (direction 17B in FIG. 5) shown in FIG. 3 (b), and then into the movable side arc extinguishing chamber 14B. Is extinguished.

Next, the effect of the intermediate runner 12 having the above configuration on the arc extinguishing function will be described. As shown in FIG. 5, the arc generated and commutated is commutated to the U-shaped bending point 15 of the intermediate runner 12, and is divided into an arc 16C and an arc 16D.
Here, in the arc drive after the division in the intermediate runner 12, the divided arcs are driven in the direction of the arc extinguishing chambers 14A and 14B arranged at the upper part of the runner 12. It is necessary to drive not only upward but also left and right.
Therefore, the intermediate runner 12 of the first embodiment has a structure in which a slit 19 for controlling the current path is added to the portion 15 where the extension direction of the intermediate runner 12 changes.

FIG. 6 is a front view of the intermediate runner 12 showing the effect of the slit of the intermediate runner on the arc drive. For the sake of explanation and simplification of the figure, FIG. 6 illustrates and explains only the arc 16C generated between the fixed side arc runner 10 and the intermediate runner 12, and only the surface portion on which the arc 16C runs on the intermediate runner 12. Is illustrated.
The arc 16B that has been commutated and ignited is due to the electromagnetic force generated by the electric current and the flow of the conductive hot gas generated at the time of firing, etc. The arc is commutated to the U-shaped bending point 15 at the lower part of the intermediate runner 12, and the arc is divided into 16C-1 and arc 16D (opposite side of the display surface in FIG. 6, not shown). The divided arc 16C-1 continues to receive the same force F, jumps over the slit 19A, and reaches the position of the arc 16C-2.
Here, as described above, in the arc drive after division, in order to drive each arc in the direction of the arc extinguishing chambers 14A and 14B arranged at the upper part of the runner 12, the divided arc is moved up. It is necessary to drive not only in the direction but also to the left and right. In FIG. 6, in order to drive the divided arc 16C-1 to the arc extinguishing chamber 14A, it is necessary to drive the arc 16C-1 in the upper left direction of the display surface of FIG.

In the intermediate runner 12 of the first embodiment, in order to increase the arc electromagnetic driving force and drive the divided arc in an arbitrary direction, slits 19A and 19B are inserted in the bent portion where the extension direction of the runner changes. Therefore, the path of the current flowing inside the intermediate runner 12 is controlled to generate an arc driving force in the directions of the arc extinguishing chambers 14A and 14B (the upper left direction of the display surface of FIG. 6).
When the arc is driven up to 16C-2, the current flowing inside the intermediate runner 12 becomes the path shown by the broken line arrow 21 in FIG. 6 due to the influence of the slit 19A. Due to the change in the path, the electromagnetic force due to the current flowing inside the intermediate runner 12 by the arc 16C-2 is in the left direction on the display surface of FIG. 6 as shown in the figure.
Arc 16-2 continues to receive the electromagnetic force in the left direction and reaches the position of arc 16C-3. The arc that has reached 16C-3 becomes the current path inside the intermediate runner 12 shown by the broken line in the figure by the slit 19B, and the arc 16C-3 receives an upward electromagnetic force and is driven in the arc extinguishing chamber 14A direction. To.
That is, the path of the current flowing inside the intermediate runner 12 becomes a path bypassing each slit 19, and the electromagnetic force to the arc due to the current flowing inside the intermediate runner 12 is the same as the extension direction of the runner 12, so that it is extinguished. The arc can be quickly driven to the arc chambers 14A and 14B, and high current limiting performance can be obtained.

As described above, according to the first embodiment, the intermediate runner 12 is provided in the arc extinguishing device 14, a plurality of arc extinguishing chambers 14 are arranged, and the magnetic grid 13 for extinguishing the arc divided by the intermediate runner 12 is constant. These arc-extinguishing chambers 14A and 14B are configured as arc-extinguishing chambers 14A and 14B arranged in one direction at predetermined intervals of By arranging them in parallel, it is possible to realize the miniaturization of the arc extinguishing chamber 14 by arc division, and by adding the slit 19 to the structure of the intermediate runner 12, it works on the arc by the current path flowing inside the intermediate runner 12. The direction of the electromagnetic force and the extension direction of the runner can be the same, the arc can be reliably driven in the direction of the arc extinguishing chamber 14, and high current limiting performance can be obtained by the quick arc drive.

Further, in the lower part of the arc extinguishing chamber 14, the height of the arc extinguishing chamber 14 is increased by arranging the arc traveling portion AR of the fixed side arc runner 10, the movable side arc runner 11, and the intermediate runner 12 so as to extend in the horizontal direction. It can be reduced to the last minute.

As described in the first embodiment, in this application, a structure is obtained in which the arc is divided by the intermediate runner 12 and the arc can be quickly driven even by the circuit breaker that cuts off the arcs in the plurality of arc extinguishing chambers 14A and 14B. For the purpose of this, a plurality of arc extinguishing chambers 14A and 14B in which magnetic grids 13 for extinguishing an arc divided by an intermediate runner 12 are arranged in one direction at regular intervals are connected to a DC high-speed circuit breaker in the arc extension direction. The structure is such that the intermediate runner 12 is provided in parallel with each other and the slits 19A and 19B are attached to the change points in the extension direction of the intermediate runner 12.

Embodiment 2.
The second embodiment will be described with reference to FIG. 7. FIG. 7 is a perspective view showing the arc runner structure according to the second embodiment, and the slits 19A and 19B of the runner extension direction change portion of the intermediate runner 12 described in the first embodiment are provided with the fixed side arc runner 10 and the movable side arc runner 11. It is also added to. The fixed side and movable side arc runners 10 and 11 are provided with slits 19A and 19B at locations where the runner extension direction changes, respectively.
With such a structure, in addition to the electromagnetic driving force of the intermediate runner 12, the electromagnetic driving force acting on the arc can be increased in the fixed side and movable side arc runners 10 and 11, further improving the current limiting performance. It can be performed.
A three-view view of the fixed-side and movable-side arcrunners 10 and 11 provided with the slits 19A and 19B corresponding to FIG. 7 is shown in FIG. 11 (a) is a top view of the fixed side and movable side arc runners 10 and 11, FIG. 11 (b) is an end view, and FIG. 11 (c) is a side view.

Embodiment 3.
FIG. 8 is a perspective view showing an intermediate runner structure according to the third embodiment, in which a slit 22 is provided at a position where the runner extension direction changes in the intermediate runner 12, and an insulator SR is filled in a gap portion of the slit 22. Since the slit 22 of the intermediate runner 12 is added to control the current path inside the intermediate runner 12, a structure filled with an insulator SR may be used as long as the current path can be controlled. .. Further, by filling the insulator SR, it is possible to eliminate the edge of the arc traveling portion of the intermediate runner 12, and it is possible to prevent the retention of hot gas and prevent the re-ignition at the edge portion. Examples of the material of the insulator SR include those having excellent heat resistance and those having flame retardancy, such as unsaturated polyester resin, polyamide resin, and ceramic.
FIG. 12 shows a three-view view of the intermediate runner 12 in which the gap portion of the slit 22 is filled with the insulator SR. 12 (a) is a top view of the intermediate runner 12, FIG. 12 (b) is an end view, and FIG. 12 (c) is a side view.

The matters disclosed as the technical idea in this application can be freely combined with the embodiments, and the embodiments can be appropriately modified or omitted within the technical scope.

1 Fixed contact, 2 Stator, 3 Movable contact, 4 Movable element, 5 Input actuator, 6 Upper conductor, 7 Lower conductor, 8 Detector, 9 Latch, 10 Fixed side arc runner, 11 Movable side arc runner, 12 Intermediate runner, 13 Grid, 14 arc extinguishing chamber, 14A movable side arc extinguishing chamber, 14B fixed side arc extinguishing chamber, 15 intermediate runner commutation part U-shaped bending point, 16 arc, 16A arc at arc, 16B arc at commutation, 16C fixed side Arc between arcranna and intermediate runner, 16D arc between movable side arc runner and intermediate runner, 17 arc drive direction after intermediate runner division, 18 partition wall, 19, 19A, 19B slit, 20 direction of electromagnetic driving force acting on arc, 21 Current path flowing inside the intermediate runner, 22 slits.

Claims (5)

A stator having a fixed contact, a mover having a movable contact that can be attached to and detached from the fixed contact, and an arc that is transferred from the fixed contact in order to drive the arc generated when the contact is opened to the arc extinguishing chamber. A fixed-side arc runner, a movable-side arc runner for transferring an arc from the movable contact, and an intermediate runner provided facing the fixed-side arc runner and the movable-side arc runner to divide the arc into a plurality of parts . The arc traveling portion of the fixed side arc runner, the arc traveling portion of the movable side arc runner, and the arc traveling portion of the intermediate runner are respectively extended in the horizontal direction, and the arc that extinguishes the arc divided by the intermediate runner is extinguished. A plurality of arc-extinguishing chambers in which the grids are arranged in one direction at predetermined intervals are provided, and the plurality of arc-extinguishing chambers are arranged in parallel with each other so that the extension direction of the arc is directed above the DC high-speed breaker. A DC high-speed breaker arc extinguishing device characterized by being A stator having a fixed contact, a mover having a movable contact that can be attached to and detached from the fixed contact, and an arc that is transferred from the fixed contact in order to drive the arc generated when the contact is opened to the arc extinguishing chamber. A fixed-side arc runner, a movable-side arc runner for transferring an arc from the movable contact, and an intermediate runner provided facing the fixed-side arc runner and the movable-side arc runner to divide the arc into a plurality of parts. A plurality of arc-extinguishing chambers are provided in which magnetic grids for extinguishing an arc divided by the intermediate runner are arranged in one direction at predetermined intervals, and the plurality of arc-extinguishing chambers have a DC height in the arc extension direction. An arc extinguishing device for a DC high-speed breaker, which is arranged in parallel with each other so as to face upward of the speed breaker, and the intermediate runner is provided with a slit at a position where the extension direction of the intermediate runner changes. .. The arc extinguishing device for a DC high-speed circuit breaker according to claim 2, wherein the fixed-side arc runner and the movable-side arc runner have slits at locations where the arc runner extends in the extension direction. The arc extinguishing device for a DC high-speed circuit breaker according to claim 2 or 3, wherein the slit portion is filled with an insulating material. Any of claims 2 to 4, wherein in the lower part of the arc extinguishing chamber, the arc running portion of the fixed side arc runner, the movable side arc runner, and the intermediate runner is provided so as to extend in the horizontal direction. The arc extinguishing device for the DC high-speed circuit breaker according to item 1.

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