KR102508800B1 - Direct current circuit breaker - Google Patents

Abstract

The present invention relates to a DC circuit breaker. A DC circuit breaker according to an embodiment of the present invention includes a fixed contact coupled to one surface, a fixed contact electrically connected to a load, and a movable contact coupled to a surface opposite to one surface of the fixed contact, wherein the A movable contact that is movable so that the movable contact selectively contacts the fixed contact and is electrically connected to a power source, two core parts arranged to face each other on both sides of the fixed contact and the movable contact, and a magnetic field generated during energization A coil part electrically connected to each end of the core part at both ends to deliver a power to the core part, and when the contact between the movable contact point and the fixed contact is released, the power is supplied to the coil part according to the movement of the movable contactor. It includes a connection part installed on any one of the core parts to be selectively contactable with the movable contactor.

Description

DC breaker {DIRECT CURRENT CIRCUIT BREAKER}

The present invention relates to a DC circuit breaker.

A circuit breaker is an electrical protection device installed between power and load devices to protect load devices and lines from accidental currents (large currents caused by short circuits, ground faults, etc.) that may occur in electrical circuits. etc. can be used in various fields.

Circuit breakers can be broadly classified into DC circuit breakers and AC circuit breakers according to the power system in which the circuit breakers are used. In addition, circuit breakers can be divided into high-speed circuit breakers, semi-high speed circuit breakers, and general type circuit breakers according to the current cutoff response speed.

A circuit breaker controls energization between a power source and a load by contacting or separating a movable contact point and a fixed contact point disposed therein. More specifically, the circuit breaker is a fixed contactor, a movable contactor, a driving unit that provides a driving force for moving the movable contactor to selectively bring the fixed contactor and the movable contactor into contact, and a driving force interposed between the driving unit and the movable contactor and provided by the driving unit. It may include a power transmission unit that transmits to the movable contactor.

When the movable contact and the fixed contact are separated, an arc current is generated between the movable contact and the fixed contact. The circuit breaker includes an extinguishing part or an extinguishing chamber for extinguishing the arc current. The arc current may be induced to the arc extinguishing unit or the arc extinguishing chamber by the magnetic flux generated around the arc current and be extinguished.

On the other hand, unlike AC circuit breakers, DC circuit breakers do not have a zero point in current, so it is more difficult to extinguish the arc current generated between contacts than AC circuit breakers, and the speed at which arc current disappears is one of the main factors determining the performance of a circuit breaker. One.

Conventionally, since power for generating a magnetic field around an arc current is supplied from the outside, a time delay occurs when power is applied by an external power source, thereby degrading the performance of the device.

Republic of Korea Patent Publication No. 10-2004-0007777 (published on January 28, 2004, DC circuit breaker capable of breaking small current and method for breaking small current)

An object of the present invention is to provide a DC circuit breaker capable of quickly and stably cutting off an arc current generated when a contact is separated.

Another object of the present invention is to provide a DC circuit breaker having a simpler structure.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention not mentioned above can be understood by the following description and will be more clearly understood by the examples of the present invention. It will also be readily apparent that the objects and advantages of the present invention may be realized by means of the instrumentalities and combinations indicated in the claims.

According to one aspect of the present invention for achieving this object, it includes a fixed contact coupled to one surface, a fixed contact electrically connected to a load, and a movable contact coupled to one surface opposite to one surface of the fixed contact, , The movable contact is movable so as to selectively contact the fixed contact, and the movable contact is electrically connected to the power source, the two core parts disposed to face each other on both sides of the fixed contact and the movable contact, generated when energized A coil part electrically connected to each end of the core part at both ends to deliver a magnetic field to the core part, and to the movement of the movable contactor to supply the power to the coil part when contact is released between the movable contact point and the fixed contact point. Accordingly, there is provided a DC circuit breaker including a connection part installed on any one of the core parts to be selectively contacted with the movable contactor.

Here, the movable contact includes a protruding portion protruding toward the core from a side surface crossing the one surface to which the movable contact is coupled, and the connecting portion can selectively contact the protruding portion according to the movement of the movable contact. can be placed.

The protrusion may be formed to extend to the one surface of the movable contact.

The protrusion may be integrally formed with the movable contact.

The connection part may include a rod extending from the coil part toward the side surface of the movable contact and a roller rotatably coupled to one end of the rod and directly contacting the protruding part.

The connection part may further include an elastic body installed between the rod and the roller to buffer a pressing force generated by contact between the protruding part and the roller.

According to the present invention as described above, when the movable contact is moved to separate the fixed contact and the movable contact, the connecting part is in contact with the movable contact, and when the contact is made between the connecting part and the movable contact, power is supplied to the coil part that generates a magnetic field. Therefore, it is possible to implement a DC circuit breaker capable of quickly and stably cutting off the arc current.

In addition, according to the present invention, since the connection part can contact the movable contact by the movement of the movable contact, and when the connection between the connection part and the movable contact is made, power is immediately supplied to the coil part, so that contact release between the movable contact and the fixed contact is achieved. A DC circuit breaker with a simpler structure can be implemented without requiring a separate device for detecting and generating a power supply application signal.

1 is a perspective view showing a DC circuit breaker according to an embodiment of the present invention;
FIG. 2 is a view showing a state in which a movable contactor moves in the DC circuit breaker shown in FIG. 1;
3 is a plan view of the DC circuit breaker shown in FIG. 1;
FIG. 4 is a view showing a state in which a movable contactor moves in the DC circuit breaker shown in FIG. 3;
5 is a view showing a modified example of a movable contactor in the DC circuit breaker shown in FIG. 1;
6 is a view showing a state in which a movable contactor moves in the DC circuit breaker shown in FIG. 5;
7 is a view showing a connection part of the DC circuit breaker shown in FIG. 1;
Fig. 8 is a cross-sectional view taken along line I-I in Fig. 7;

The above objects, features and advantages will be described later in detail with reference to the accompanying drawings, and accordingly, those skilled in the art to which the present invention belongs will be able to easily implement the technical spirit of the present invention. In describing the present invention, if it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

1 is a perspective view showing a DC circuit breaker according to an embodiment of the present invention, and FIG. 2 is a view showing a state in which a movable contactor moves in the DC circuit breaker shown in FIG. 1 .

1 and 2, a DC circuit breaker 100 according to an embodiment of the present invention includes a fixed contact 110, a movable contact 120, two core parts 130, a coil part 140, and a connection part. (150).

The DC circuit breaker 100 according to the present embodiment may include a case (not shown) constituting the exterior of the device, and may include the fixed contact 110, the movable contact 120, the core part 130, and the coil part listed above. 140 and the connection portion 150 may be accommodated inside the case. In addition, partition walls and the like for dividing the internal space may be installed inside the case, and frames and the like for arranging parts accommodated therein may be installed.

In addition, the DC circuit breaker 100 according to the present embodiment has a generally well-known configuration in addition to the above-listed configurations (eg, a driving unit that generates a driving force for moving the movable contactor, and transfers the driving force generated by the driving unit to the movable contactor). It goes without saying that a power transmission unit that extinguishes an arc current generated when a movable contact and a fixed contact are separated, etc.) may be further included.

The fixed contact 110 includes a fixed contact 115 coupled to one surface and is electrically connected to a load (not shown). The stationary contact 110 may be formed in a plate shape as a whole and have a plurality of surfaces, and may be fixed by being coupled to a partition wall or a frame inside the case to maintain a fixed position in the device.

The fixed contact point 115 may be coupled to any one surface of a plurality of surfaces of the fixed contact 110 . The fixed contact 115 is formed as a separate body from the fixed contact 110 and can be coupled to one surface of the fixed contact 110 through various coupling methods. Alternatively, the fixed contact 115 may be integrally formed with the fixed contact 110 to form a single body with the fixed contact 110 .

The load electrically connected to the fixed contactor 110 is a component that receives power from a power source electrically connected to the movable contactor 120 to be described later, and the fixed contactor 110 and The type of load connected can be changed.

The movable contact 120 includes a movable contact 125 coupled to one surface opposite to one surface of the fixed contact 110 to which the fixed contact 115 is coupled, and the movable contact 125 is selectively connected to the fixed contact 115. It is movable to contact and electrically connected to a power source (not shown).

The movable contact 120 is formed in a plate shape as a whole and may have a plurality of surfaces, and may be movably coupled to a partition wall or a frame inside the case so that the position may be changed in the device.

The movable contact 125 may be coupled to one surface opposite to one surface of the fixed contact 110 to which the fixed contact 115 is coupled among the plurality of surfaces of the movable contact 110 . The movable contact 125 is formed as a separate body from the movable contact 120 and is coupled to the movable contact 120 through various coupling methods, or formed integrally with the movable contact 120 to form a single unit with the movable contact 120. body can be achieved.

Since the movable contact 125 is coupled or formed on one surface of the movable contact 120 facing the fixed contact 110, as the movable contact 120 moves toward the fixed contact 110, the movable contact 125 is fixed. Contact 115 may be contacted. Conversely, when the movable contact 120 moves away from the fixed contact 110, the movable contact 125 can be separated from the fixed contact 115.

The movable contact 120 may move within the device through various methods so that the movable contact 125 and the fixed contact 115 selectively contact each other. For example, the movable contact 120 may be configured to linearly reciprocate along a direction in close contact with the fixed contact 110 and a direction away from the fixed contact 110 .

The movable contact 120 shown in FIGS. 1 and 2 is centered on an axis (not shown) disposed parallel to the thickness direction of the movable contact 120 (same as the extending direction of the coil unit in FIGS. 1 and 2 ). rotates the axis with That is, the movable contact 120 can move away from the fixed contact 110 by rotating in the direction of the arrow shown in FIG. 2 around the axis along the thickness direction. Alternatively, the movable contact 120 may move in close contact with the fixed contact 110 by rotating in a direction opposite to the direction of the arrow shown in FIG. 2 .

The movable contact 120 is electrically connected to the power source. When the movable contact 120 moves toward the fixed contact 110 and the movable contact 125 and the fixed contact 115 come into contact, since the movable contact 120 and the fixed contact 110 are energized, the load is supplied from the power source. power can be supplied. Conversely, when contact between the movable contact point 125 and the fixed contact point 115 is released, the load cannot receive power from the power source.

The two core parts 130 are arranged to face each other on both sides of the fixed contact point 115 and the movable contact point 125. That is, the core part 130 is disposed to face the side surfaces of the fixed contact 110 and the movable contact 120 . Here, the side surfaces of the fixed contact 110 mean two surfaces crossing one surface of the fixed contact 110 to which the fixed contact 115 is coupled (two surfaces crossing the thickness direction of the fixed contact). In addition, the side surfaces of the movable contact 120 mean two surfaces crossing one surface of the movable contact 120 to which the movable contact 125 is coupled (two surfaces crossing the thickness direction of the movable contact).

The two core parts 130 are arranged so that the fixed contact 115 and the movable contact 125 are placed between the two core parts 130 even when the fixed contact 115 and the movable contact 125 are separated. That is, the width of the core part 130 is substantially equal to or greater than the maximum separation distance between the fixed contact 110 and the movable contact 120 . Thus, when the fixed contact point 115 and the movable contact point 125 are separated, the arc current formed between the contacts can be placed in the magnetic field generated by the core part 130 .

Meanwhile, the core unit 130 has a first core 132 disposed on one side of the fixed contact 115 and the movable contact 125 and a second disposed on the other side of the fixed contact 115 and the movable contact 125. 2 cores 134.

The coil unit 140 is electrically connected to one end of each of the two core units 130 at both ends so as to transfer a magnetic field generated during energization to the core unit 130 .

One end of the first core 132 is disposed on the side of the fixed contact point 115 and the movable contact point 125, and the other end of the first core 132 is connected to one end of the coil unit 140. One end of the second core 134 is disposed on the side of the fixed contact 115 and the movable contact 125 to face one end of the first core 132, and the other end of the second core 134 is disposed on the side of the coil unit 140. ) is connected to the other end of

When current flows through the coil unit 140, the coil unit 140 generates a magnetic field, and since both ends of the coil unit 140 are connected to the first core 132 and the second core 134, respectively, the coil unit 140 The magnetic field generated by ) may be transmitted to the first core 132 and the second core 134 .

The connection part 150 moves according to the movement of the movable contact 120 to supply power electrically connected to the movable contact 120 to the coil part 140 when the contact between the movable contact 125 and the fixed contact 115 is released. It is installed on any one of the two core parts 130 to be selectively contactable with the contactor 120 .

The connection part 150 may be installed on the first core 132 or the second core 134 and electrically connected to the coil part 140 . That is, since the connection part 150 is installed on the core part 130 to be electrically connected to the core part 130 and the core part 130 is electrically connected to the coil part 140, the connection part 150 and the coil part ( 140) may be electrically connected via the core unit 130.

When the movable contact 120 moves away from the fixed contact 110 so that the contact between the movable contact 125 and the fixed contact 115 is released, the connection part 150 may come into contact with the movable contact 120. When the connection unit 150 and the movable contactor 120 are in contact, power may be supplied to the coil unit 150 from a power source electrically connected to the movable contactor 120 .

That is, since the DC circuit breaker 100 according to the present embodiment supplies the power necessary for the coil unit 140 to generate a magnetic field from the power source connected to the movable contactor 120, unlike the prior art, external power and wiring accordingly The configuration of a separate device can be omitted.

In addition, in the DC circuit breaker 100 according to this embodiment, when the connection part 150 can contact the movable contactor 120 by the movement of the movable contactor 120 and the connection between the connection part 150 and the movable contactor 120 is made. Since power is immediately supplied to the coil unit 140, a separate device for detecting contact release between the movable contact point 125 and the fixed contact point 115 is not required. Accordingly, the DC circuit breaker according to the present embodiment (100) detects contact release between the movable contact and the fixed contact, applies a power supply signal to the external power source, and prevents time delay that occurs until power is supplied to the coil unit from the external power source. Thus, the response characteristics of the entire device can be improved.

1 shows a state in which the movable contact 125 and the fixed contact 115 are in contact so that the movable contact 120 and the connection part 150 do not come into contact, and FIG. 2 shows the movable contact 125 and the fixed contact A state in which the contact of 115 is released and the movable contact 120 and the connection part 150 are in contact is shown.

FIG. 3 is a plan view of the DC circuit breaker shown in FIG. 1, and FIG. 4 is a view showing the movement of the movable contactor in the DC circuit breaker shown in FIG.

Referring to FIGS. 3 and 4 , it can be seen that a mechanism for selectively contacting the movable contact 120 and the connection part 150 according to the movement of the movable contact 120 is shown in more detail.

Hereinafter, the operating method of the DC circuit breaker 100 according to the present embodiment will be described in detail with reference to FIGS. 1 to 4 .

As shown in FIGS. 1 and 3 , when the fixed contact 115 and the movable contact 125 come into contact, movement of current between the fixed contact 110 and the movable contact 120 is permitted. Accordingly, power may be supplied from a power source connected to the movable contactor 120 to a load connected to the fixed contactor 110 .

As shown in FIGS. 2 and 4, when the fixed contact 115 and the movable contact 125 are separated by accident or intentionally, the movement of current between the fixed contact 110 and the movable contact 120 is blocked. do. At this time, an arc current is formed between the fixed contact point 115 and the movable contact point 125. At the same time, the connection part 150 is brought into contact with the movable contactor 120, and power is supplied to the coil part 140 from the power supply connected to the movable contactor 120, and the coil part 140 generates a magnetic field to form two cores. It is delivered to unit 130.

The arc current formed between the fixed contact point 115 and the movable contact point 125 is placed in the magnetic field generated by the two opposing core parts 130, and the arc current receives a force corresponding to the direction of the magnetic field to extinguish the arc (not shown) may be induced to disappear.

The arc extinguishing unit may be configured in the DC circuit breaker 100 according to the present embodiment as in a known technique. Of course, the arrangement of the arc extinguishing unit may be changed according to the direction of the magnetic field generated by the coil unit 140 .

Meanwhile, the connection parts 150 may be respectively installed in the two core parts 130 . At this time, when one of the connecting parts is in contact with the movable contactor 120, the other connecting part is configured not to contact the movable contactor 120. When a plurality of connection units are provided as described above, the direction of the current flowing through the coil unit 140 can be controlled, and the direction of the magnetic field generated accordingly can also be controlled.

A grounding unit 135 may be coupled to the core unit 130 , and the grounding unit 135 may be any one of the first core 132 and the second core 134 to which the connection unit 150 is not installed. (130). When a plurality of connection units 150 are provided, a plurality of grounding units may also be provided.

On the other hand, the movable contact 120 may include a protrusion 122 formed to protrude toward the core part 130 from a side surface intersecting with one surface to which the movable contact 125 is coupled, and the connection part 150 is a movable contact According to the movement of the 120 may be disposed to selectively come into contact with the protruding portion 122.

As shown in FIGS. 3 and 4 , the movable contact 120 may include a protrusion 122 protruding toward the core portion 130 from a side facing the core portion 130 . In a state where the movable contact 120 is positioned to maintain contact between the movable contact 125 and the fixed contact 115 (in the case of FIG. 3 ), the protrusion 122 does not contact the connecting part 150 . At this time, the protruding part 122 is placed closer to the fixed contact 110 than the connection part 150 .

When the movable contact 120 moves to release the contact between the movable contact 125 and the fixed contact 115, the protruding part 122 moves away from the fixed contact 110 and can come into contact with the connection part 150.

The protrusion 122 may be formed to extend to one surface of the movable contact 120 on which the movable contact 125 is formed. In addition, the protrusion 122 may be integrally formed with the movable contact 120 . That is, the protrusion 122 can be formed by changing the shape of the side of the movable contact 120 .

FIG. 5 is a view showing a modified example of the movable contactor in the DC circuit breaker shown in FIG. 1, and FIG. 6 is a view showing how the movable contactor moves in the DC circuit breaker shown in FIG.

Referring to FIGS. 5 and 6 , the protrusion 124 of the movable contact 120 may be formed in the middle region of the side of the movable contact 120 . Since other configurations are the same as those of the DC circuit breaker described with reference to FIGS. 1 to 4 , a detailed description of each configuration is omitted here.

FIG. 7 is a view showing a connection portion of the DC circuit breaker shown in FIG. 1 , and FIG. 8 is a cross-sectional view taken along line I-I in FIG. 7 .

7 and 8, the connection part 150 of the DC circuit breaker 100 according to this embodiment includes a rod 152 and a rod 152 extending from the coil part 140 toward the side of the movable contactor 120. ) It may include a roller 154 that is rotatably coupled to one end of the movable contact and directly contacts the protrusion of the movable contactor.

One end of the rod 152 is coupled to the core, and the other end of the rod 152 is coupled to the roller 154. Since the roller 154 is rotatably coupled to the other end of the rod 152, when the movable contactor moves while in contact with the movable contactor, the roller 154 can roll on the surface of the movable contactor and the movable contactor and the roller (154) can reduce the resistance that may occur between them.

On the other hand, as shown in FIG. 8, the connection part 150 further includes an elastic body 155 installed between the rod 152 and the roller 154 to buffer the pressing force generated by the contact between the protrusion and the roller 154. can do.

That is, the elastic body 155 absorbs the pressing force so that the pressing force generated between the movable contactor and the roller 154 is transmitted to the movable contactor and hindering the movement of the movable contactor when the movable contactor and the roller 154 are in contact with each other. can That is, the roller 154 may be coupled to the rod 152 so as to be rotatably coupled to the rod 152 and movable in a lateral direction toward the rod 152 at the same time. As a result, the roller 154 can move linearly toward the rod 152 by absorbing the pressing force generated when the movable contactor and the roller 154 come into contact. In addition, the elastic body 155 provides restoring force so that the roller 154 returns to its original position when the contact between the movable contactor and the roller 154 is released.

According to the present invention described above, since the power required for the coil unit 140 to generate a magnetic field is supplied from the power source connected to the movable contactor 120, unlike the prior art, an external power source and a separate device configuration such as wiring accordingly are required. can be omitted. Accordingly, a device having a simpler structure may be implemented.

In addition, according to the present invention, when the connection part 150 can contact the movable contactor 120 by the movement of the movable contactor 120 and the connection between the connection part 150 and the movable contactor 120 is made, the coil part 140 immediately Since it is configured to supply power, a separate device for detecting contact release between the movable contact point 125 and the fixed contact point 115 is not required. Accordingly, the response characteristics of the entire device can be improved by detecting contact release between the movable contact and the fixed contact, applying a power supply signal to the external power source, and preventing a time delay from supplying power to the coil unit from the external power source. .

The above-described present invention, since various substitutions, modifications, and changes are possible to those skilled in the art without departing from the technical spirit of the present invention, the above-described embodiments and accompanying drawings is not limited by

100: DC circuit breaker 110: fixed contactor
115: fixed contact 120: movable contact
122, 124: protrusion 125: movable contact
130: core part 132: first core
134: second core 135: ground
140: coil part 150: connection part
152: rod 154: roller
155: elastic body

Claims (6)

A fixed contact including a fixed contact coupled to one surface and electrically connected to a load;
A movable contact including a movable contact coupled to one surface of the fixed contact and opposite to the other, movable so that the movable contact selectively contacts the fixed contact, and electrically connected to a power source;
two core parts disposed to face each other on both sides of the fixed contact point and the movable contact point;
a coil unit electrically connected to each end of the core unit at both ends so as to transfer a magnetic field generated during energization to the core unit; and
A connection part installed on any one of the core parts to be selectively contacted with the movable contact according to the movement of the movable contact to supply the power to the coil part when the contact between the movable contact and the fixed contact is released,
The movable contact
And a protruding portion formed to protrude toward the core portion from a side surface intersecting the one surface to which the movable contact is coupled,
The connection part
A DC circuit breaker disposed to selectively contact the protruding portion according to the movement of the movable contactor.
delete According to claim 1,
The protrusion is formed to extend to the one surface of the movable contact, DC circuit breaker.
According to claim 1 or 3,
The protrusion is formed integrally with the movable contactor, the DC circuit breaker.
According to claim 1 or 3,
The connection part
a rod extending from the coil part toward the side surface of the movable contact; and
A DC circuit breaker comprising a; roller rotatably coupled to one end of the rod and directly contacting the protruding portion.
According to claim 5,
The connection part
Further comprising an elastic body installed between the rod and the roller to buffer the pressing force generated by the contact between the protrusion and the roller, DC circuit breaker.

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