KR20160127217A

KR20160127217A - Circuit breaker

Info

Publication number: KR20160127217A
Application number: KR1020150057387A
Authority: KR
Inventors: 방성식; 안철현; 박현성
Original assignee: 현대중공업 주식회사
Priority date: 2015-04-23
Filing date: 2015-04-23
Publication date: 2016-11-03
Also published as: KR101692788B1

Abstract

A circuit breaker according to an embodiment of the present invention includes an enclosure, a vacuum valve disposed inside the enclosure and having one end fixedly secured to the enclosure, and a vacuum valve disposed between the vacuum valve and the enclosure, And a support plate for maintaining the distance.
According to this circuit breaker, the movement of the vacuum valve is blocked through the support plate and the vacuum valve is stably supported. Therefore, it is possible to prevent the position of the vacuum valve from being deformed or distorted even in repetitive operation of the contacts.

Description

Circuit breaker {CIRCUIT BREAKER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker, and more particularly, to a circuit breaker capable of suppressing the movement of a vacuum valve due to a breaking shock.

When a fault occurs in the power system, a high fault current corresponding to several tens of times the rated current can flow due to a sudden drop in the load impedance. In order to prevent the spread of the fault area and damage of other equipment in case of power system accident, the fault current should be automatically shut off quickly and the reliability of the circuit breaker having such function has a key influence on the reliability of the whole system. Circuit breakers used in distribution systems are mainly composed of VCB (Circuit Breaker) which is excellent in blocking performance, safety and reliability, and the usage of circuit breaker is gradually increasing as load is increased.

Generally, the circuit breaker has a vacuum valve in which a fixed contact and a movable contact are provided inside an insulating container. The movable contact receives power from the driving unit and is electrically connected to and disconnected from the fixed contact.

At the moment when the movable contact is separated from the fixed contact, such a circuit breaker generates a strong repulsive force between the contacts due to the electromagnetic force, and this repulsive force acts as an external force to the movable contact.

As the external force repeatedly acts, the movable contact does not maintain the fixed position but moves to the outside, resulting in a problem of misalignment between the contact points.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a circuit breaker capable of suppressing the movement of a movable contact.

A circuit breaker according to an embodiment of the present invention includes an enclosure, a vacuum valve disposed inside the enclosure and having one end fixedly secured to the enclosure, and a vacuum valve disposed between the vacuum valve and the enclosure, And a support plate for maintaining the distance.

In the present embodiment, the vacuum valve includes a fixed contact disposed at one end of the vacuum valve and fixed to the housing, and a movable contact disposed at the other end of the vacuum valve and arranged to be movable in the vacuum valve can do.

In this embodiment, one end of the support plate may be disposed at a position adjacent to the other end of the vacuum valve, and the other end may be fastened to the inner wall of the enclosure.

In this embodiment, the enclosure may include an insertion groove into which the support plate is inserted.

In the present embodiment, at least one through hole may be formed in the support plate.

The circuit breaker according to an embodiment of the present invention includes an enclosure, a vacuum valve disposed inside the enclosure and having one end fixedly secured to the enclosure, and a support plate coupled to the enclosure and suppressing movement of the vacuum valve .

The circuit breaker according to the embodiment of the present invention having such a configuration cuts off the movement of the vacuum valve through the support plate and stably supports the vacuum valve. Therefore, it is possible to prevent the position of the vacuum valve from being deformed or distorted even in repetitive operation of the contacts.

1 is a sectional view of a circuit breaker in an open state according to an embodiment of the present invention;
2 is a sectional view of the closed state of the circuit breaker shown in Fig.
3 is a perspective view of the circuit breaker shown in Fig.
Fig. 4 is an exploded perspective view of the circuit breaker shown in Fig. 3; Fig.
5 is a cross-sectional view taken along line AA of FIG.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. In addition, the shape and size of elements in the figures may be exaggerated for clarity.

Fig. 1 is a sectional view of an open state of a circuit breaker according to an embodiment of the present invention, and Fig. 2 is a sectional view of a closed state of the circuit breaker shown in Fig.

1 and 2, a circuit breaker according to an embodiment of the present invention will be described.

A circuit breaker 100 according to an embodiment of the present invention may include an enclosure 110, a vacuum valve 190, a buffer member 150, a connection rod 160, and a support plate 170.

The enclosure 110 is a case member that can be accommodated in an internal space, such as a vacuum valve 190, a buffer member 150, a connection rod 160, etc., which will be described later.

The enclosure 110 may be formed of one case member or may be completed by combining a plurality of case members.

For internal isolation of the circuit breaker 100, the interior space of the enclosure 110 may be filled with insulating gas.

At least one insertion groove 112 may be formed in the inner surface of the enclosure 110.

The support plate 170, which will be described later, can be inserted into the insertion groove 112 in a sliding manner. Accordingly, the insertion grooves 112 can be equally formed on the three inner walls depending on the shape of the support plate 170.

Meanwhile, in this embodiment, a plurality of protrusions are formed on the inner wall of the enclosure 110, and a space between the protrusions is formed as an insertion groove 112. However, the present invention is not limited to this, and various modifications are possible, for example, forming grooves in the inner wall of the enclosure 110 at an engraved angle.

The vacuum valve 190 may include an insulating container 120, a fixed contact 130, and a movable contact 140.

The insulating container 120 may be disposed inside the enclosure 110 and may include a fixed contact 130 and a movable contact 140 to be described later.

The inside of the insulating container 120 may be formed in a vacuum state close to 0 bar.

In this embodiment, the insulating container 120 is constituted by a cylindrical insulator in which the stationary contact 130 and the movable contact 140 are disposed through both ends, respectively. However, the present invention is not limited thereto.

The fixed contact 130 is fixedly disposed inside the insulating container 120. Therefore, it can be integrally coupled with the insulating container 120 at one end side of the insulating container 120. [

The stationary contact 130 is electrically connected to a line conductor that extends to the outside of the enclosure 110. Accordingly, when the stationary contact 130 is connected to the movable contact 140, which will be described later, the current path of the system is energized.

The movable contact 140 is disposed inside the insulating container 120 so as to face the fixed contact 130 and is connected to a line conductor extending to the outside of the enclosure 110. Accordingly, when the movable contact 140 is connected to the fixed contact 130, a current path for energizing the system current is provided.

The movable contact 140 receives power from a separate driving unit (not shown) and moves inside the insulating container 120, so that the movable contact 140 can be contacted with and separated from the fixed contact 130.

The movable contact 140 is coupled to the insulating container so as to be movable along the longitudinal direction of the insulating container at the other end of the insulating container.

The vacuum valve 190 according to the present embodiment includes a movable rod 143 which penetrates the other end of the insulating container 120 and connects the movable contact 140 and the connecting rod 160, A sealing member 145 disposed between the insulating container 120 and the insulating container 120 to provide a path through which the movable rod 143 moves and an insulating container 120 connecting the movable contact 140 and the movable contact 140, (Bellows) 147 for maintaining a vacuum state inside the insulating container 120 even if the bellows is moved.

The cushioning member 150 is connected to the movable contact 140 via the connection rod 160 to transmit the power of the driving unit to the movable contact 140 to move the movable contact 140.

The buffer member 150 may be configured to include the insulating case 152 and the contact spring 157.

The insulation case 152 is connected to a connection rod 160 which will be described later, and a contact spring 157 is disposed in an inner space of the insulation case 152.

The contact pressure spring 157 elastically presses the connection rod 160 in the direction of the fixed contact 130 to apply a contact pressure load to the fixed contact 130 and the movable contact 140.

Here, the contact load refers to a load applied to the contact surface between the movable contact 140 and the fixed contact 130 when the movable contact 140 and the fixed contact 130 make contact with each other.

For reference, the higher the contact pressure load, the more stable and smooth the energization between the contacts, and the detachment of the contacts by the electric force can be prevented.

This splice spring 157 is compressed in the closed state as shown in FIG. 2 and can apply the elastic restoring force to the movable contact 140 continuously. Thus, the contact reliability of the vacuum valve 190 can be increased.

The connection rod 160 is disposed between the movable contact 140 and the buffer member 150 and may be formed of an insulator.

One end of the connection rod 160 is connected to the movable rod 143 and the other end is connected to the contact spring 157 through the internal space of the buffer member 150. Therefore, the elastic force of the contact pressure spring 157 is transmitted to the movable contact 140 through the connecting rod 160.

The support plate 170 is disposed between the enclosure 110 and the vacuum valve 190 to support the vacuum valve 190.

More specifically, the support plate 170 is inserted into the insertion groove 112 formed in the enclosure 110 so that one end is fixedly coupled to the enclosure 110 and the other end is fixed to the outer surface of the insulating container 120 of the vacuum valve 190 Or disposed adjacent to each other.

Thus, when the vacuum valve 190 is moved or shaken, the movement is limited by the support plate 170.

Fig. 3 is a perspective view of the circuit breaker shown in Fig. 1, Fig. 4 is an exploded perspective view of the circuit breaker shown in Fig. 3, and Fig. 5 is a sectional view taken along line A-A of Fig.

3 to 5, a vacuum valve 190 according to the present embodiment has one end to which the stationary contact 130 is disposed is fixed to the outside. Therefore, when a short circuit occurs and the movable contact 140 is separated from the fixed contact 130 in the vacuum valve 190, a strong repulsive force occurs together with the arc between the contacts 130 and 140, The repulsive force can act as an external force (A in Fig. 1) pushing the movable contact 140 outward from the center.

Since the movable contact 140 is connected only to the connection rod 160, the movable contact 140 and the other end (i.e., the lower end) of the insulating container 120 supporting the movable contact 140 It can be pushed outward.

Therefore, in order to prevent the position of the insulating container 120 from being changed, the circuit breaker 100 according to the present embodiment includes the support plate 170.

The support plate 170 is disposed between the enclosure 110 and the insulating container 120 to maintain a separation distance therebetween. Therefore, even if an external force is applied to the movable contact 140, the action of the external force is removed by the support plate 170 without any significant influence, and the movable contact 140 or the insulating container 120 maintains the correct position.

In the vacuum valve 190 according to the present embodiment, one end (that is, the upper end) of the insulating container 120 is fixedly fastened. Therefore, when an external force is generated, the other end (i.e., the lower end) of the insulating container 120 moves most greatly.

Accordingly, it may be effective that the support plate 170 according to the present embodiment is arranged so that the insulating container 120 supports the other end side. However, the present invention is not limited thereto.

Also, at least one through hole 175 is formed in the support plate 170 according to the present embodiment. The through hole 175 is provided to smoothly maintain the insulating gas (or air) flow inside the enclosure 110.

When the through hole 175 of the support plate 170 is omitted, the insulating gas inside the enclosure 110 can be blocked by the support plate 170. If the flow of the insulated gas is not smoothly performed, the heat generated in the circuit breaker 100 may not smoothly radiate.

Accordingly, the circuit breaker 100 according to the present embodiment provides the environment in which the insulated gas can flow smoothly inside the enclosure 110 by forming the through-hole 175 in the support plate 170.

The above-described circuit breaker according to the embodiment of the present invention blocks the movement of the vacuum valve through the support plate and stably supports the vacuum valve. Therefore, it is possible to prevent the position of the vacuum valve from being deformed or distorted even in repetitive operation of the contacts.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be obvious to those of ordinary skill in the art.

100: Circuit breaker
110: enclosure
190: Vacuum valve
120: insulating container
130: Fixed contact
140: movable contact
143:
145: sealing member
147: Bellows
150: buffer member
160: Connection load
170: Support plate
175: Through hole

Claims

Enclosure;
A vacuum valve disposed inside the enclosure and having one end fixedly coupled to the enclosure; And
A support plate disposed between the vacuum valve and the enclosure to maintain a distance between the vacuum valve and the enclosure;
Circuit breaker.

The vacuum cleaner according to claim 1,
A fixed contact disposed at one end of the vacuum valve and coupled to the housing; And
A movable contact disposed on the other end side of the vacuum valve and movable in the vacuum valve;
Circuit breaker.

3. The apparatus according to claim 2,
Wherein one end is disposed at a position adjacent to the other end of the vacuum valve and the other end is fastened to an inner wall of the enclosure.

The apparatus of claim 1,
And an insertion groove into which the support plate is inserted is formed on the inner wall.

The apparatus of claim 1,
Wherein at least one through hole is formed in the inside of the circuit breaker.

Enclosure;
A vacuum valve disposed inside the enclosure and having one end fixedly coupled to the enclosure; And
A support plate coupled to the enclosure and restraining movement of the vacuum valve;
Circuit breaker.