KR20220127031A - Direct Current Circuit Breaker - Google Patents

Abstract

The present invention relates to a DC circuit breaker, and more particularly, to a DC circuit breaker with reduced dispersion of arc occurrence positions at a planar contact point. A DC circuit breaker according to an embodiment of the present invention includes: a fixed contactor; a plane fixed contact point fixed to the fixed contactor; a movable contactor that rotates or reverses to approach or move away from the fixed contactor; a plane movable contact point fixed to the movable contactor; a fixed part arc runner installed on the upper part of the fixed contactor; a movable part arc runner installed on the upper part of the movable contactor; and an arc-extinguishing part installed on the top of the fixed part arc runner and the movable part arc runner. A movable contact portion contacting the plane fixed contact point is formed at the upper end of the planar movable contact point when energized. The remaining part of the planar movable contact point is formed with a movable spaced portion that does not come into contact with the planar fixed contact point when energized.

Description

Direct Current Circuit Breaker

The present invention relates to a DC circuit breaker, and more particularly, to a DC circuit breaker having reduced dispersion of arcing positions in a planar contact.

In general, under the same power transmission capacity, direct current (DC) has the advantage of reducing wire requirements and pylon size compared to alternating current (AC). If the transmission capacity is the same, the use of direct current can reduce the amount of wire required by 30% compared to the case of using alternating current. Due to these advantages, the DC power distribution market is gradually expanding.

According to this trend, the demand for DC circuit breakers is increasing in various fields such as distribution-class LVDC (Low Voltage Direct Current), ESS (Energy Storage System), and the renewable energy market.

A DC circuit breaker is a circuit breaker that has a fault detection unit inside the device to detect and break the abnormal current at high speed before the polarization abnormal current reaches the maximum value when an abnormal current occurs in the DC circuit. DC circuit breaker has short response time after detecting short circuit and overcurrent.

A DC circuit breaker trips when an overcurrent or fault current occurs like an AC circuit breaker. The circuit breaker and the line are protected by blocking the power provided to the load side by the breaking operation of the switching mechanism.

A DC circuit breaker is composed of a contact part, an opening/closing mechanism part, a trip part, an arc extinguishing part, and the like like an AC circuit breaker. The movable contact of the contact part contacts or opens the fixed contact by the opening/closing mechanism part, and the circuit is energized or cut off.

When an abnormal current occurs in the DC circuit, the trip unit releases the opening/closing mechanism to open the contact or directly open the contact.

When two contacts that were in contact are opened while the current is energized, an arc is generated between the two contacts, and this arc moves to the extinguishing unit and is extinguished while being cut off.

1 shows a DC circuit breaker according to the prior art. It is a picture drawn briefly from the contact point to the extinguishing part to express the extinguishing principle of a DC circuit breaker.

The DC circuit breaker according to the prior art is an arc generated when the fixed contact 2 connected to one end of the circuit 1, the movable contact 3 connected to the other end of the circuit 1, and the contact parts 2 and 3 are cut off. Arc runners (4,5) for guiding (A) to arc chute (6), arc chute (6) and arc chute (6) providing space for extinguishing the induced arc It includes a plurality of grids (7) provided in the arc for dividing the cooling.

Unlike an AC circuit, a DC circuit does not have a voltage zero point, so when a contact is disconnected, an arc is generated and current is continuously supplied. Therefore, in order to completely cut off the current, the arc must be extinguished using the extinguishing unit.

When a short circuit occurs in a DC circuit, the arc generated as the main contact is separated rises in the arc chute 6 direction by the Lorentz force through the magnetic force interaction caused by the arc current and the arc current (here, the unit generating the magnetic field is shown has been omitted). The arc (A) is transferred to the arc runner (4,5) at the contact portion (2,3) and moves to the arc chute (6) by continuously rising. The arc comes into contact with the grid 7 and spreads in the widely arranged grid 7, thereby increasing the arc voltage.

As the arc spreads over the entire area of the upper surface of the arc runners 4 and 5 and spreads to the grid at the distal end, the arc length is extended to the maximum. At this time, the arc voltage rises to the highest value.

The arc of maximum arc voltage is divided in series into several smaller arcs in each grid, with voltage drop and arc cooling occurring. The divided arc and the ionized gas by the arc move upward and slow down in the upper space of the grid, and as the ionized gas cools, the ionization state is released. That is, the arc reaches the extinguishing completion state.

In the DC circuit breaker according to the prior art, in the case of a DC circuit breaker having no separate arc contact and having planar main contacts 2a and 3a, the fixed contact 2a and the movable contact 3a have a surface contact structure upon closing. When the flat contact part is cut off, the contact surface of the movable contact (3a) and the fixed contact (2a) is separated as the movable contact (3) rotates based on the rotation axis, and after arcing at the contact, ride the contact and arc runner (4,5) to the upper part It is extended into the arc chute (6) and extinguished.

However, the DC circuit breaker having a planar main contact has a structure in which the fixed contact and the movable contact are in surface contact when closing, but in reality, the surface contact is not made uniformly in contact with the entire plane, but is made by point contact or line contact at a specific location. is average. Therefore, when the movable contact rotates with respect to the rotating shaft when blocking, the contact surface of the movable contact and the fixed point is in point contact or line contact when separated, and then the arc is generated in an irregular position. That is, an arc may be generated at an arbitrary position such as the upper part (a), the middle part (b), and the lower part (c) of the contact point. In this case, the time the arc travels to the arc chute is non-uniform depending on the location of occurrence, resulting in inconsistent blocking performance. If the arc occurs in the middle (b) or lower part (c) of the contact, the time the arc moves to the arc chute is delayed, so the cut-off time becomes longer and the cut-off current can be high.

The present invention has been devised to solve the above problems, and an object of the present invention is to provide a DC circuit breaker having reduced dispersion of arc generation positions in a planar contact point.

A DC circuit breaker according to an aspect of the present invention includes a fixed contact, a planar fixed contact fixedly installed on the fixed contact, a movable contact that rotates or reverses to approach or away from the fixed contact, and a planar movable contact that is fixedly installed on the movable contactor In the DC circuit breaker comprising a fixed arc runner installed on the upper portion of the fixed contactor, a movable arc runner installed on the upper portion of the movable contactor, and an arc extinguishing portion installed on the fixed arc runner and the movable arc runner, the At the upper end of the planar movable contact, a movable contact in contact with the planar fixed contact is formed when energized, and a movable spaced portion not in contact with the planar fixed contact when energized is formed in the remaining portion of the planar movable contact.

Here, a first movable part mounting groove to which the planar movable contact can be mounted is formed in the movable contact, and the first movable part mounting groove is inclined to form a predetermined angle on the front surface of the movable contact.

In addition, the predetermined angle is characterized in that the range between 1 degree to 2 degrees.

In addition, the front part of the planar movable contact is characterized in that it forms an inclined surface engraved downward.

In addition, the movable contact portion is formed as a surface parallel to the front portion of the movable contact, and the movable spaced portion is characterized in that it forms a downwardly engraved inclined surface.

In addition, the movable contact portion forms an upwardly embossed inclined surface, and the movable spaced portion is characterized in that it is formed in a plane parallel to the front portion of the movable contactor.

A DC circuit breaker according to an aspect of the present invention includes a fixed contact, a planar fixed contact fixedly installed on the fixed contact, a movable contact that rotates or reverses to approach or away from the fixed contact, and a planar movable contact that is fixedly installed on the movable contactor In the DC circuit breaker comprising a fixed arc runner installed on the upper portion of the fixed contactor, a movable arc runner installed on the upper portion of the movable contactor, and an arc extinguishing portion installed on the fixed arc runner and the movable arc runner, the A fixed contact portion is formed at the upper end of the planar fixed contact to contact the planar movable contact when energized, and a fixed spaced portion that is not in contact with the planar movable contact when energized is formed in the remaining portion of the planar fixed contact.

Here, the fixed contact is formed with a fixing part mounting groove to which the planar fixed contact can be mounted, and the fixing part mounting groove is inclined to form a predetermined angle on the front surface of the movable contact.

In addition, the predetermined angle is characterized in that the range between 1 degree to 2 degrees.

In addition, the front portion of the flat fixed contact is characterized in that it forms an inclined surface engraved downward.

In addition, the fixed contact portion is formed as a surface parallel to the front portion of the fixed contact, and the fixed spaced portion is characterized in that it forms a downwardly engraved inclined surface.

In addition, the fixed contact portion forms an upwardly embossed inclined surface, and the fixed spaced portion is characterized in that it is formed as a surface parallel to the front portion of the fixed contact.

According to the DC circuit breaker according to an embodiment of the present invention, an inclined portion is provided on the planar fixed contact or the planar movable contact so that the contact surface or the contact point is disposed at the upper end of the contact portion. Therefore, the contact portion of the contact portion is constant and the breaking performance is consistent. It also prevents an increase in cut-off current.

1 shows a front structural diagram of a DC circuit breaker according to the prior art.
2 and 3 are front views of a DC circuit breaker according to a first embodiment of the present invention. Fig. 2 shows an open state, and Fig. 3 shows an energized state.
4 is an exploded view of the movable contact in FIG. 3 .
5 to 7 show movable contacts according to the second embodiment, the third embodiment, and the fourth embodiment of the present invention, respectively.
8 is a front view of a DC circuit breaker according to a fifth embodiment of the present invention.
9 is an exploded view of the fixed contact in FIG. 8 .
10 to 12 show fixed contacts according to the sixth, seventh, and eighth embodiments of the present invention, respectively.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings, which is intended to describe in detail enough that a person of ordinary skill in the art to which the present invention pertains can easily practice the invention, thereby It is not meant to limit the technical spirit and scope of the invention.

<First embodiment>

2 and 3 are front views of a DC circuit breaker according to a first embodiment of the present invention. Fig. 2 shows an open state, and Fig. 3 shows an energized state. 4 is an exploded view of the movable contact in FIG. 3 . A DC circuit breaker according to each embodiment of the present invention will be described in detail with reference to the drawings.

A DC circuit breaker according to an embodiment of the present invention includes a fixed contact 40; a flat fixed contact 42 fixedly installed on the fixed contact 40; a movable contactor (60) rotating or reversely rotating so as to be closer to or away from the fixed contactor (40); a planar movable contact 62 that is fixedly installed on the movable contact 60, a fixed arc runner 30 that is installed on the fixed contact 40; a movable arc runner 35 installed on the movable contact 60; The arc runner 30 of the fixed part and the arc runner 90 are installed on the upper part of the arc runner 35 of the movable part; A movable contact portion (62a) in contact is formed, and a movable separation portion (62b) not in contact with the flat fixed contact point (42) when energized is formed on the remaining portion of the planar movable contact point (62).

First, let's look at the basic configuration of a DC circuit breaker.

The enclosure 10 may be formed in a box shape. The enclosure 10 may be formed of an insulating material. Each component of the circuit breaker is accommodated and installed inside the enclosure 10 . These components include trip devices, switchgear, and extinguishing devices.

The opening/closing device (not shown) is a mechanism for operating the fixed contact 40 and the movable contact 60 . The opening/closing device is driven to operate between a closed position (closed state) in which the movable contactor 60 contacts the fixed contactor (40) and an open position (blocked state) in which the movable contactor (60) is separated from the fixed contactor (40). . The opening/closing device may include a fixing mechanism, an input mechanism, and movable parts 50 and 60 and fixing parts 40 and 44 , and the like.

A trip device (not shown) is a mechanism that detects when a fault current such as an overcurrent or a short-circuit current flows in the circuit, and drives the opening/closing device to operate the circuit in the open position.

The fire extinguishing device or the arc extinguishing unit 90 is configured by stacking a plurality of grids on the movable contact 62 and the fixed contact 42, and operates in an open position while energized (eg trip operation or manual off operation) It is a mechanism that quickly extinguishes the arc generated between the movable contact 62 and the fixed contact 42 at the time of operation. Arc runners 30 and 35 are provided between the contact parts 42 and 62 and the arc extinguishing part 90 to guide the arc to the arc extinguishing part.

On the other hand, although not shown separately, an arc driving unit that forms a magnetic field so that the arc is extended and guided to the arc extinguishing unit 90 may be provided.

In a normal operating state, the movable contact 60 is rotated by the opening and closing device to contact or separate the fixed contact 40, and when an accident current occurs, the movable contact 60 is separated from the fixed contact 40 by a trip device. are separated

Let's take a closer look at each of the components installed in the interior of the enclosure (10).

One side of the enclosure 10 is provided with terminals 20 and 25 connected to the circuit. The terminals 20 and 25 may include a first terminal 20 and a second terminal 25 . The first terminal 20 may be positive (+) or negative (-). In addition, the second terminal 25 may be positive (+) or negative (-). Here, the first terminal 20 and the second terminal 25 may be configured to have opposite poles. That is, when the circuit is closed, the first terminal 20 is configured as a positive (+) and the second terminal 25 is configured as a negative (-), or the first terminal 20 is configured as a negative (-) and the second terminal 25 may be configured as a positive electrode (+). In other words, when the circuit is closed, a current flowing in the direction from the first terminal 20 to the second terminal 25 is generated or a current flowing from the second terminal 25 to the first terminal 20 is generated. can

Arc runners 30 and 35 are provided. The arc runners 30 and 35 may include a fixed arc runner 30 provided on the side of the fixed contact 40 and a movable arc runner 35 provided on the side of the movable contact 60 . The fixed arc runner 30 may be provided on the fixed contact 40 . The movable arc runner 35 may be provided on the movable contact 60 .

A fixed contact 40 and a movable contact 60 are provided.

The fixed contact 40 is made of a material having good conductivity. The fixed contact 40 is connected to any one terminal. For example, the fixed contact 40 is connected to the upper first terminal 20 . A fixing part connecting member 44 may be provided between the stationary contact 40 and the first terminal 20 . The connecting member 44 is made of a conductive material.

The fixed contact 40 is provided with a planar fixed contact 42 . The planar fixed contact 42 is made of a material having excellent electrical conductivity and strong heat resistance. For example, the planar fixed contact 42 may be formed of a silver-nickel alloy (AgNi, AgNiC, etc.).

The planar fixed contact 42 may be formed as a rectangular flat plate. The planar fixed contact 42 is adopted because it has advantages such as ease of manufacture, reduction of manufacturing cost, and ease of contact.

The movable contact 60 is made of a material having good conductivity. The movable contact 60 is connected to any one terminal. For example, the movable contact 60 is connected to the lower second terminal 25 . A movable part connecting member 49 may be provided between the movable contact 60 and the second terminal 25 . The movable part connecting member 49 is made of a conductive material. Between the movable part connecting member 49 and the movable contactor 60, a flexible member 68 (flexible element) which is made of a flexible material and can be bent may be provided.

The movable contact 60 is provided with a planar movable contact 62 . The planar movable contact 62 is made of a material having excellent electrical conductivity and strong heat resistance. For example, the planar movable contact 62 may be formed of a silver-nickel alloy (AgNi, AgNiC, etc.).

The planar movable contact 62 may be formed in a rectangular flat plate. The planar movable contact 62 is adopted because it has advantages such as ease of manufacture, reduction of manufacturing cost, and ease of contact.

The movable contact 60 may be rotatably coupled to the movable member support 50 . The movable contact 60 is rotatably coupled to the shaft 58 of the movable member support 50 . The movable contact 60 is rotated about the shaft 58 to contact or separate the fixed contact 40 .

An arc inducing part 65 for inducing an arc may be provided above the movable contact 60 .

4 shows a state in which the movable contact 60 and the planar movable contact 62 are separated.

A first movable part mounting groove 61 is formed on the movable contactor 60 . The first movable part mounting groove 61 forms an inclination with the front surface of the movable contact 60 at a predetermined angle α. Here, the front surface of the movable contact 60 is a surface parallel to the vertical plane in the drawing or parallel to the contact surface a-a of the planar fixed contact point 42 . The predetermined angle α is preferably in a range between 1 degree and 2 degrees. That is, 1° < α < 2°.

The planar movable contact 62 is composed of a flat plate, that is, a flat plate. Since the planar movable contact 62 is fixedly installed in the first movable part mounting groove 61 of the movable contact 60 , the movable contact 62a is provided at the upper end of the planar movable contact 62 .

When energized, the movable contact portion 62a of the planar movable contact 62 contacts the planar fixed contact 42 . In this embodiment, the uppermost end of the planar movable contact 62 is in contact with the planar fixed contact 42 . That is, the remaining portion except for the upper end of the planar movable contact 62 forms the movable separation portion (62b). Since the middle or lower portion of the planar movable contact 62 does not contact the planar fixed contact 42 during energization, an arc is generated at the upper end of the planar movable contact 62, which is the movable contact 62a, when cut off. Accordingly, arc extinguishing is easy because the path induced to the arc extinguishing unit 90 has the shortest distance. Thus, the blocking performance remains stable and consistent. It also prevents an increase in cut-off current.

<Second embodiment>

Since the basic configuration in this embodiment is the same as that of the first embodiment, the contents of the first embodiment are applied as they are without repeating explanations for the same parts. Reference will be made to FIG. 5 .

A second movable part mounting groove 61-1 is formed in the movable contactor 60 . Here, the second movable part mounting groove 61-1 is formed parallel to the front surface (contact surface) a-a of the lower movable contact 60 or the flat fixed contact 42 . That is, the second movable part mounting groove 61-1 does not form an inclined surface.

The front part of the planar movable contact 62-1 forms an inclined surface. Accordingly, the upper end of the planar movable contact 62-1 forms the movable contact portion 62a-1, and the remaining portion of the planar movable contact 62-1 forms the movable spaced portion 62b-1.

Since the movable contact portion 62a-1 of the planar movable contact 62-1 contacts the planar stationary contact 42 when energized, the uppermost end of the planar movable contact 62-1 in this embodiment is on the planar stationary contact 42. contact That is, since the middle or lower portion of the planar movable contact 62-1 does not contact the planar fixed contact 42, an arc is generated at the uppermost end of the planar movable contact 62, which is the movable contact 62a-1, when cut off. Accordingly, arc extinguishing is easy because the path induced to the arc extinguishing unit 90 has the shortest distance. Thus, the blocking performance remains stable and consistent. It also prevents an increase in cut-off current.

<Third embodiment>

Since the basic configuration in this embodiment is the same as that of the first embodiment, the contents of the first embodiment are applied as they are without repeating explanations for the same parts. Reference will be made to FIG. 6 .

A third movable part mounting groove 61 - 2 is formed in the movable contactor 60 . Here, the third movable part mounting groove 61-2 is formed parallel to the front surface (contact surface) a-a of the lower movable contact 60 or the flat fixed contact 42 . That is, the second movable part mounting groove 61-1 does not form an inclined surface.

A part (lower part) of the front part of the planar movable contact point 62-2 forms an inclined surface. Accordingly, the upper end of the planar movable contact 62-2 is formed parallel to the front surface (contact surface) a-a of the movable contact 60 or the planar fixed contact 42 to form the movable contact portion 62a-2, and the planar type The remaining part of the movable contact point 62-2 is formed as a downwardly engraved inclined surface to form the movable separation part 62b-2.

When energized, the movable contact portion 62a-2 of the planar movable contact 62-2 contacts the planar fixed contact 42-2. That is, since the movable spaced portion 62b-2 of the planar movable contact 62-2 does not contact, an arc is generated at the upper end of the planar movable contact 62, which is the movable contact 62a-2, when cut off. Accordingly, arc extinguishing is easy because the path induced to the arc extinguishing unit 90 has the shortest distance. Thus, the blocking performance remains stable and consistent. It also prevents an increase in cut-off current.

<Fourth embodiment>

Since the basic configuration in this embodiment is the same as that of the first embodiment, the contents of the first embodiment are applied as they are without repeating explanations for the same parts. Reference will be made to FIG. 7 .

A fourth movable part mounting groove 61-3 is formed in the movable contact 60 . Here, the fourth movable part mounting groove 61-3 is formed parallel to the front surface of the lower movable contact 60 or the front surface (contact surface) a-a of the planar fixed contact 42 . That is, the second movable part mounting groove 61-1 does not form an inclined surface.

The front part of the planar movable contact point 62-3 forms an inclined surface in which a part (upper part) protrudes upward (upwardly embossed). Therefore, the upper end of the planar movable contact (62-3) is formed with the front part of the movable contact (60) and an inclined or protruding surface to form the movable contact (62a-3), and of the planar movable contact (62-3) The remaining portion is formed in parallel with the front portion of the movable contact 60 to form the movable separation portion (62b-3).

Since the movable contact portion 62a-3 of the planar movable contact 62-3 contacts the planar stationary contact 42-3 during energization, the uppermost end of the planar movable contact 62-3 is connected to the planar stationary contact 42-3. contact That is, since the middle portion or lower portion of the planar movable contact 62-3, which is the movable separation portion 62b-3, does not contact the planar fixed contact 42, an arc is generated in the movable contact 62a-3 when cut off. Accordingly, arc extinguishing is easy because the path induced to the arc extinguishing unit 90 has the shortest distance. Thus, the blocking performance remains stable and consistent. It also prevents an increase in cut-off current.

<Fifth embodiment>

A DC circuit breaker according to another embodiment of the present invention includes a fixed contact 40; a flat fixed contact 42 fixedly installed on the fixed contact 40; a movable contactor (60) rotating or reversely rotating so as to be closer to or away from the fixed contactor (40); a planar movable contact 62 that is fixedly installed on the movable contact 60, a fixed arc runner 30 that is installed on the fixed contact 40; a movable arc runner 35 installed on the movable contact 60; The arc runner 30 of the fixed part and the arc extinguishing part 90 installed on the upper part of the arc runner 35 of the movable part 35 are included, and the upper end of the planar fixed contact 42 has the planar movable contact 62 when energized. A fixed contact portion 42a in contact is formed, and a fixed separation portion 42b not in contact with the planar movable contact 62 when energized is formed on the remaining portion of the planar fixed contact 42 .

Among the configurations except for the fixed contact in this embodiment, it is the same as the first embodiment, except that the planar movable contact 62 is composed of a flat plate and arranged in a vertical direction in a energized state, so the same parts will not be separately described. .

8 is a front view of a DC circuit breaker according to a fifth embodiment of the present invention, and FIG. 9 is an exploded view of the fixed contact in FIG.

8 shows a state in which the planar movable contact 62 and the planar fixed contact 42 are in contact.

A first fixing part mounting groove 41 is formed at the top of the stationary contact 40 . The first fixing part mounting groove 41 forms a predetermined angle β with the front surface of the fixing contact 40 . Here, the front surface of the movable contact 60 is a plane parallel to the vertical plane in the drawing or parallel to the contact surface b-b of the planar movable contact 62 . The predetermined angle β is preferably in a range between 1 degree and 2 degrees. That is, 1° < β < 2°.

The planar fixed contact 42 is composed of a flat plate. Since the planar fixed contact 42 is fixedly installed in the first fixed portion mounting groove 41 of the fixed contact 40 , the fixed contact 42a is provided at the upper end of the planar fixed contact 42 .

Since the planar movable contact 62 is in contact with the fixed contact portion 42a of the planar fixed contact 42 during energization, the planar movable contact 62 is in contact with the uppermost end of the planar fixed contact 42 . That is, since the planar movable contact 62 does not contact the middle or lower portion of the planar fixed contact 42 that is the fixed spaced portion 42b, an arc is generated in the fixed contact portion 42a when cut off. Accordingly, arc extinguishing is easy because the path induced to the arc extinguishing unit 90 has the shortest distance. Thus, the blocking performance remains stable and consistent. It also prevents an increase in cut-off current.

<Sixth embodiment>

Since the basic configuration in this embodiment is the same as that of the fifth embodiment, the contents of the fifth embodiment are applied as they are without repeating explanations for the same parts. Reference will be made to FIG. 10 .

A second fixing part mounting groove 41-1 is formed in the stationary contact 40 . Here, the second fixing part mounting groove 41-1 is formed parallel to the front surface of the lower fixed contact 40 or the front surface b-b of the planar movable contact 62 . That is, the second fixing part mounting groove 41-1 does not form an inclined surface.

The front portion of the planar fixed contact 42-1 forms an inclined surface engraved downward. Accordingly, the upper end of the planar fixed contact 42-1 forms the fixed contact portion 42a-1, and the remaining portion of the planar fixed contact 42-1 forms the fixed spaced portion 42b-1.

Since the planar movable contact 62 is in contact with the fixed contact portion 42a-1 of the planar stationary contact 42-1 during energization, the planar movable contact 62 is in contact with the uppermost end of the planar stationary contact 42-1. That is, since the middle or lower portion of the planar fixed contact 42-1, which is the planar movable contact 62, which is the fixed spaced portion 42b-1, does not contact, an arc is generated in the fixed contact portion 42a-1 when blocking. Accordingly, arc extinguishing is easy because the path induced to the arc extinguishing unit 90 has the shortest distance. Thus, the blocking performance remains stable and consistent. It also prevents an increase in cut-off current.

<Seventh embodiment>

Since the basic configuration in this embodiment is the same as that of the fifth embodiment, the contents of the fifth embodiment are applied as they are without repeating explanations for the same parts. Reference will be made to FIG. 11 .

A third fixing part mounting groove 41-2 is formed in the stationary contact 40 . Here, the third fixing part mounting groove 41-2 is formed parallel to the front surface of the lower fixed contact 40 or the front surface b-b of the planar movable contact 62 . That is, the third fixing part mounting groove 41-2 does not form an inclined surface.

The front part of the planar fixed contact 42-2 forms an inclined surface in which a part (lower part) is engraved downward. Accordingly, the upper end of the planar fixed contact 42-2 is formed in a plane parallel to the front surface of the fixed contact 40 or the front surface b-b of the planar movable contact 62 to form the fixed contact portion 42a-2, The remaining portion of the planar fixed contact 42-2 is formed as an inclined surface to form the fixed spaced portion 42b-2.

Since the planar movable contact 62 is in contact with the fixed contact portion 42a-2 of the planar fixed contact 42-2 during energization, the planar movable contact 62 is in contact with the uppermost end of the planar fixed contact 42-2. That is, since the planar movable contact 62 does not contact the middle or lower portion of the planar fixed contact 42-2, which is the fixed spaced portion 42b-2, an arc is generated in the fixed contact portion 42a-2 when cut off. Accordingly, arc extinguishing is easy because the path induced to the arc extinguishing unit 90 has the shortest distance. Thus, the blocking performance remains stable and consistent. It also prevents an increase in cut-off current.

<Eighth embodiment>

Since the basic configuration in this embodiment is the same as that of the fifth embodiment, the contents of the fifth embodiment are applied as they are without repeating explanations for the same parts. Reference will be made to FIG. 12 .

A fourth fixing part mounting groove 41-3 is formed in the stationary contact 40 . Here, the fourth fixing part mounting groove 41-3 is formed parallel to the front surface of the lower fixed contact 40 or the front surface b-b of the planar movable contact 62 . That is, the fourth fixing part mounting groove 41-3 does not form an inclined surface.

The front part of the planar fixed contact point 42-3 forms an inclined surface in which a part (the upper part) protrudes upward (embossed upward). Accordingly, the upper end of the planar fixed contact 42-3 is formed with the front surface of the fixed contact 40 and an inclined or protruding surface to form the fixed contact 42a-3, and The remaining portion is formed parallel to the front portion of the fixed contact 40 to form the fixed spaced portion (42b-3).

Since the planar movable contact 62 is in contact with the fixed contact portion 42a-3 of the planar fixed contact 42-3 during energization, the planar movable contact 62 is in contact with the uppermost end of the planar fixed contact 42-3. That is, since the planar movable contact 62 does not contact the middle or lower portion of the planar fixed contact 42-3, which is the fixed spaced portion 42b-3, an arc is generated in the fixed contact portion 42a-3 when cut off. Accordingly, arc extinguishing is easy because the path induced to the arc extinguishing unit 90 has the shortest distance. Thus, the blocking performance remains stable and consistent. It also prevents an increase in cut-off current.

According to the DC circuit breaker according to an embodiment of the present invention, an inclined portion is provided on the planar fixed contact or the planar movable contact so that the contact surface or the contact point is disposed at the upper end of the contact portion. Therefore, the contact portion of the contact portion is constant and the breaking performance is consistent. It also prevents an increase in cut-off current.

The embodiments described above are embodiments for implementing the present invention, and various modifications and variations may be made by those of ordinary skill in the art to which the present invention pertains without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to illustrate, and the scope of the technical spirit of the present invention is not limited by these embodiments. That is, the protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

10 enclosure
20 Terminal 1
25 Terminal 2
30 Fixed arc runner
35 Moving part arc runner
40 fixed contact
42 flat fixed contact
42a fixed contact
42b fixed spacing
50 moving part support
58 shaft
60 movable contact
62 planar movable contact
62a movable contact
62b Movable Separator

Claims (12)

A fixed contact, a planar fixed contact that is fixedly installed on the fixed contact, a movable contact that rotates or reverses toward or away from the fixed contact, a planar movable contact that is fixedly installed on the movable contact, and a high that is installed on the fixed contact In a DC circuit breaker including a positive arc runner, a movable arc runner installed on the upper part of the movable contactor, and an arc extinguishing part installed on the fixed arc runner and the movable arc runner,
The upper end of the planar movable contact is formed with a movable contact in contact with the planar fixed contact when energized, and a movable spaced portion not in contact with the flattened fixed contact when energized is formed in the remaining portion of the planar movable contact. . The DC circuit breaker according to claim 1, wherein the movable contactor has a movable part mounting groove in which the planar movable contact can be mounted, and the movable part mounting groove is inclined to form a predetermined angle on the front surface of the movable contactor. . The DC circuit breaker according to claim 2, wherein the predetermined angle is in a range between 1 degree and 2 degrees. [2] The DC circuit breaker according to claim 1, wherein the front portion of the planar movable contact forms an inclined surface engraved downward. [2] The DC circuit breaker according to claim 1, wherein the movable contact part is formed as a plane parallel to the front surface of the movable contact part, and the movable spacer part has an inclined surface engraved downward. The DC circuit breaker according to claim 1, wherein the movable contact part forms an upwardly embossed inclined surface, and the movable spaced part is formed in a plane parallel to the front surface of the movable contact part. A fixed contact, a planar fixed contact that is fixedly installed on the fixed contact, a movable contact that rotates or reverses toward or away from the fixed contact, a planar movable contact that is fixedly installed on the movable contact, and a high that is installed on the fixed contact In a DC circuit breaker including a positive arc runner, a movable arc runner installed on the upper part of the movable contactor, and an arc extinguishing part installed on the fixed arc runner and the movable arc runner,
A fixed contact portion is formed on the upper end of the planar fixed contact to contact the planar movable contact when energized, and a fixed spaced portion that is not in contact with the flattened movable contact when energized is formed in the remaining portion of the planar fixed contact. . [Claim 8] The method of claim 7, wherein the fixed contact is provided with a fixing portion mounting groove to which the planar fixed contact can be mounted, and the fixing portion mounting groove is inclined to form a predetermined angle on the front surface of the movable contact. DC circuit breaker. The DC circuit breaker according to claim 8, wherein the predetermined angle is in the range of 1 degree to 2 degrees. [8] The DC circuit breaker according to claim 7, wherein the front portion of the planar fixed contact forms an inclined surface engraved downward. [8] The DC circuit breaker according to claim 7, wherein the fixed contact portion is formed as a surface parallel to the front portion of the fixed contact portion, and the fixed separation portion forms an inclined surface engraved downward. [8] The DC circuit breaker according to claim 7, wherein the fixed contact part forms an upwardly embossed inclined surface, and the fixed spaced part is formed as a surface parallel to the front surface of the fixed contact part.

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