KR101916219B1

KR101916219B1 - Molded case circuit breaker

Info

Publication number: KR101916219B1
Application number: KR1020150045603A
Authority: KR
Inventors: 강성우
Original assignee: 현대일렉트릭앤에너지시스템(주)
Priority date: 2015-03-31
Filing date: 2015-03-31
Publication date: 2018-11-07
Also published as: KR20160117031A

Abstract

Since the breaker case has the arc guide protruding downward from the ceiling portion of the discharge port, it is possible to minimize the phenomenon that the arc directed to the ceiling portion of the discharge port is bent and discharged to the floor, The present invention provides a wiring breaker capable of dispersing the energy of an arc by its action.

Description

{MOLDED CASE CIRCUIT BREAKER}

The present invention relates to a molded case circuit breaker (MCCB) that protects a circuit or a load device by shutting off a circuit when a fault current is generated.

The configuration of a general wiring breaker is schematically shown in Fig.

Generally, the circuit breaker for wiring comprises a main circuit unit having a stationary contactor 1 and a movable contactor 2, a switching mechanism 3 for opening and closing the main circuit unit, And a trip mechanism (4) for shutting off the main circuit unit by operating the switching mechanism when a fault current flows through the main circuit unit. The movable contactor is brought into contact with or separated from the stationary contactor by an opening / closing mechanism. Thus, when the opening / closing mechanism is operated by the trip mechanism to the trip position, the movable contact is separated from the fixed contact, whereby the main circuit unit is shut off.

An arc is generated between the contact points when the stationary contactor and the movable contactor are separated from each other. Since the generated arc is a conductive material in a high-temperature plasma state, it is an important factor in improving the performance of the circuit breaker to effectively extinguish the arc. Therefore, arc extinguishing structure is applied to the circuit breaker.

A general SOH structure is shown in FIG. Reference numeral 5 in Fig. 2 denotes a circuit breaker case, and the main circuit unit, the opening / closing mechanism, and the trip mechanism are mounted on the circuit breaker case. The breaker case is provided with an arc chamber (6) in which an arc is gathered and an outlet (7) communicating with the arc chamber. The arc chamber provides the SOHO space. The arc generated between the contacts is discharged to the outside through the discharge port after passing through the arc chamber.

However, the circuit breaker having such a small structure has the following problems.

A part of the generated arc can not be discharged directly through the discharge port but can be discharged to the bottom side as it proceeds to the ceiling portion near the discharge port and is bent downward substantially toward the bottom while bumping against the ceiling portion toward the discharge port. An arc that is discharged toward the bottom side may cause a ground fault.

Since the arc entering the outlet passes through the outlet as it is without any disturbance, it can not expect a special soho effect by the outlet itself. Therefore, since the discharged arc has a relatively large energy (pressure or the like), the discharged arc adversely affects the peripheral structure, so that the peripheral structure is not likely to operate normally, and thus short-circuiting may occur .

On the other hand, as the volume of the arc chamber increases, the time required for the occurrence of the fault current becomes longer, and as the cutoff time increases, the energy for the cutoff operation increases, thereby degrading the performance of the breaker. .

Korean Patent Registration No. 10-0643049 (2006.11.10)

An object of the present invention is to provide a wiring breaker capable of positively preventing occurrence of an accident caused by an arc.

It is another object of the present invention to provide a wiring breaker which can further shorten the time required for the occurrence of a fault current.

The problems to be solved are not limited thereto, and other matters not mentioned can be clearly understood by those skilled in the art from the following description.

According to an embodiment of the present invention, there is provided a circuit breaker comprising: a circuit breaker case; A stationary contactor installed inside the circuit breaker case; And a movable contact which is installed inside the circuit breaker case and is operated so as to be able to contact and separate from the fixed contactor, and an arc generated when the stationary contactor and the movable contact are separated from each other is discharged to the outside At least one arc guide for guiding the discharge direction of the arc toward the ceiling portion toward the discharge port side from the ceiling portion side of the discharge outlet is provided and the arc guide protrudes downward from the ceiling portion of the discharge outlet, It is possible to provide a circuit breaker for dividing the upper region of the circuit breaker.

The arc guide may be formed to have a streamlined structure on the rear side. An arc chamber is formed in the breaker case to communicate with the discharge hole and the generated arc is collected, and the arc guide occupies a part of the arc chamber. It may have an arc chamber occupying portion protruding toward the rear side.

Means for solving the problems will be more specifically and clarified through the embodiments, drawings, and the like described below. In addition, various solution means other than the above-mentioned solution means may be further proposed.

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According to the embodiment of the present invention, since the arc directed toward the ceiling portion on the discharge side is discharged forward by the arc guide, the occurrence of a ground fault due to discharge of the arc toward the bottom can be minimized.

In addition, since the discharge port is divided and passed while colliding with the arc guide in the process of discharging the arc, the energy of the arc can be dispersed (weakened), thereby preventing a short circuit accident caused by the discharged arc, have.

Further, since the arc chamber has a volume reduced by the arc chamber melting portion, it is possible to further shorten the cut-off time required for generating the fault current, thereby greatly reducing the energy for the cut-off operation.

1 is a schematic view showing a configuration of a general wiring breaker.
2 is a cross-sectional view showing a structure of a conventional circuit breaker.
3 is a partially cutaway perspective view showing a main part of a circuit breaker according to an embodiment of the present invention.
4 is a cross-sectional view showing part A of Fig.
5 is a sectional view taken along line BB of Fig.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. For a better understanding of the invention, it is to be understood that the size of elements and the thickness of lines may be exaggerated for clarity of understanding. Further, the terms used to describe the embodiments of the present invention are mainly defined in consideration of the functions of the present invention, and thus may be changed depending on the intentions and customs of the user and the operator. Therefore, the terminology should be interpreted based on the contents of the present specification throughout.

A wiring breaker according to an embodiment of the present invention is shown in Figs. 3-5.

3, the wiring circuit breaker according to the embodiment of the present invention includes a main circuit unit 20, an opening / closing mechanism 30, and a trip mechanism 40. As shown in FIG.

The circuit breaker according to the embodiment of the present invention includes a main circuit unit 20, an opening / closing mechanism 30 and a trip mechanism 40 mounted on the circuit breaker case 10 Respectively.

The main circuit unit (20) includes a fixed contact (22) and a movable contact (24). The movable contact 24 is provided so as to face the fixed contact 22. The stationary contactor 22 is disposed on the lower side and the movable contact 24 can be disposed on the upper side of the stationary contactor 22. The main circuit unit 20 has a configuration in which the movable contact 24 is brought into contact with or separated from the stationary contactor 22 along the direction of rotation.

The opening and closing mechanism 30 rotates the movable contact 24 to open and close the main circuit unit 20. [ When the opening / closing mechanism 30 is operated to the trip position, the movable contact 24 is disconnected (released from contact with the fixed contact 22), whereby the main circuit unit 20 is disconnected (circuit is opened).

The trip mechanism 40 is configured to operate the opening / closing mechanism 30 at the trip position when a fault current such as an overcurrent or a short-circuit current flows in the main circuit unit 20. [

The breaker case 10 includes a contactor cover 14 disposed between an upper case (not shown) and a lower case 12 and an upper case and a lower case 12 coupled to each other to constitute a case body ).

The contactor cover 14 forms an arc chamber 102 communicating with a contactor chamber and a contactor chamber in which two contacts 22 and 24 are received between the lower case 12 and the lower case 12. [

The case body is provided with a cover opening, and the contactor cover 14 is assembled so as to have a structure in which a part is exposed through the cover opening. For example, the cover opening can be disposed on one side of the wall of the case body. The contactor cover 14 may be coupled to the bottom of the lower case 12 to form the contactor chamber and the arc chamber 102 between the lower case 12 and the lower case 12 with the exposed portion positioned in the cover opening.

4 and 5, the contactor cover 14 is provided with a discharge port 104 for discharging the arc generated between the contact points of the stationary contactor 22 and the movable contactor 24, . The outlet 104 is disposed in the exposed portion of the contactor cover 14 (the portion exposed through the cover opening).

The outlet 104 communicates with the arc chamber 102. A soho grid 106 may be provided in the arc chamber 102 at the rear of the outlet 104. The arc generated between the contacts is discharged to the outside through the discharge port 104 after passing through the arc chamber 102.

An arc guide 110 for guiding the direction of discharge of the arc (discharge direction through the discharge port 104) to the ceiling portion of the discharge port 104 side toward the front side is formed on the ceiling portion side of the discharge port 104 in the contactor cover 14, May be provided singularly or plurally.

The arc guide 110 protrudes downward from the ceiling portion of the discharge port 104 to have a predetermined length and has a structure in which the upper region of the discharge port 104 is divided into left and right portions. To the unit hole 104a.

According to the arc guide 110, the arc advancing to the ceiling portion of the discharge port 104 is deflected obliquely to both sides of the arc guide 110, so that the arc advances forward through the discharge port 104. Therefore, the circuit breaker according to the embodiment of the present invention can minimize the phenomenon that the arc advancing to the ceiling portion of the discharge port 104 is bent obliquely downward to be discharged toward the bottom, The frequency of ground fault accidents can be significantly reduced.

In addition, since the arc collides with the arc guide 110 in the process of being discharged through the discharge port 104 and passes through the plurality of unit holes 104a, it is possible to reliably disperse the energy of the arc. Therefore, the circuit breaker according to the embodiment of the present invention can prevent a problem that a short circuit accident occurs due to the relatively large energy (pressure, etc.) of the discharged arc.

The arc guide 110 is formed so that its rear side has a streamlined structure. To this end, the rear side of the arc guide 110 may be formed in a shape such that its thickness decreases toward the rear end by a curved surface, an inclined surface, or the like.

According to such a streamlined structure, the wiring breaker according to the embodiment of the present invention can more reliably guide the advancing direction of the discharged arc forward, and can naturally disperse the energy of the arc.

The arc guide 110 has an arc chamber visor 112 protruding integrally toward the rear so as to occupy a part of the arc chamber 102. According to the arc chamber visor 112, the arc chamber 102 has a volume reduced by the volume occupied by the arc chamber visor 112.

The circuit breaker according to the embodiment of the present invention having the arc chamber 102 having a reduced volume can shorten the cut-off time required for generating the fault current by the reduced volume of the arc chamber 102, Thereby reducing the energy for the blocking operation and preventing the mechanical burnout of the circuit breaker.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Further, the technical ideas described in the embodiments of the present invention may be performed independently of each other, or two or more may be implemented in combination with each other.

10: Circuit breaker case
14: contactor cover
22: Fixed contact
24:
102: arc chamber
104: Outlet
104a: unit hole
110: arc guide
112: arc chamber point abutment

Claims

A breaker case;
A stationary contactor installed inside the circuit breaker case;
And a movable contact which is installed inside the circuit breaker case and is operated to be able to contact with and separate from the stationary contactor,
In the breaker case,
At least one discharge port for discharging the arc generated when the stationary contactor and the movable contactor are separated from each other,
At least one arc guide for guiding the discharge direction of the arc from the ceiling portion side of the discharge port toward the ceiling portion toward the discharge port side is provided,
Wherein the arc guide protrudes downward from a ceiling portion of the discharge port to divide an upper region of the discharge port.

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The method according to claim 1,
Wherein the arc guide is formed to have a streamlined structure on the rear side,
Circuit Breaker.

The method according to claim 1,
An arc chamber communicating with the discharge port and in which generated arc is collected is provided in the breaker case,
Wherein the arc guide has an arc chamber occupancy protruding rearward to occupy a portion of the arc chamber,
Circuit Breaker.

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