KR20050014584A - Arc runners for low voltage circuit breakers or contact systems which are discretely plates-shaped - Google Patents

Abstract

PURPOSE: A discontinuous multi-stage type arc runner is provided to achieve improved insulation recovery performance between a fixed arc contact and a movable arc contact by disconnecting an electrical path through the use of the arc runner even when the residual arc still exists in an arc suppressing unit. CONSTITUTION: A discontinuous multi-stage type arc runner(25) is divided into two or more members which are spaced apart from each other. The members include a proximal end member(23) coupled to a top surface of a fixed arc contact(10) of a fixed arc contact connection portion side; an intermediate member(22) coupled to the top surface of the fixed arc contact; and a distal end member(21) having a bent portion coupled to the top surface of the fixed arc contact and the other bent portion inclined toward a terminal portion(12) of the fixed arc contact.

Description

Arc runners for low voltage circuit breakers or contact systems which are discretely plates-shaped}

The present invention serves to move the arc to the fixed arc contact terminal portion in order to block the short-circuit current by extinguishing the arc generated when the movable arc contact is separated from the fixed arc contact by the fault current in the low-voltage breaker / switchgear It is about an arc runner.

In general, the low-voltage breaker / switchgear performs a circuit breaking operation to protect the load when a fault current or an accident current occurs in the electrical equipment and the load period wiring circuit.

In the above circuit breaking operation, when a large current flows due to a failure or an accident in the circuit, the user operates a switch to separate the movable arc contact from the fixed arc contact, or detects a fault or an accident current and automatically Ensure that the movable arc contact is separated.

As such, when the two contacts are separated, an arc, which is a conductive layer, is generated between the two contacts, and a current flows along the generated arc. At this time, the generated arc maintains a plasma state, thereby generating a strong magnetic field in the surroundings. Since it can be easily extinguished when formed, there is provided a extinguishing unit inside the low pressure circuit breaker / switchgear to extinguish the arc.

In order to form such a magnetic field, the magnetic circuit grid has been used to improve the breaking performance of the low pressure circuit breaker / switch.

However, the driving magnetic field by the grid does not increase the ability to extinguish the arc because the magnetic field is no longer increased when the breaking capacity increases to reach a certain range due to the magnetic saturation of the grid.

Therefore, in order to solve such a problem, conventionally, an arc runner is used, or a protrusion having a certain length is formed on the upper surface of the guide part of the arc runner, so that the arc is quickly delivered to the arc chamber so that the fault current can be quickly cut off. .

However, the arc runner has a problem in that when the fault current of the sine wave progresses over time and progresses toward the current zero after the high current region, the driving magnetic field of the grid is also reduced to weaken the force for moving the arc to the extinguishing unit.

In another conventional technique, as shown in FIG. 1, the integrated arc runner 20 is disposed at the upper end of the fixed arc contact 10.

The arc runner 20 is bent at one side of the tip portion, the tip portion is fixed to the fixed arc contact contact side, the other end is inclined upward toward the fixed arc contact terminal portion 12 fixed arc contact (10) Have a structure spaced apart from

The arc runner 20 serves to quickly move an arc generated between two contacts with a driving magnetic field by a grid from the fixed arc contact contact portion to the end of the fixed arc contact terminal portion along the arc runner.

In this way, the road role increases the arc length and at the same time has the effect of extinguishing the arc away from the fixed arc contact point, thereby increasing the arc resistance, which has a positive effect on the breaking performance.

In this case, however, as the fixed current flows over the sine wave, when the current value decreases toward the current zero, the arc driving magnetic field also decreases and the magnetic driving force for pushing the arc is weakened. The conduction path between two spaced apart contact points is returned to form the shortest distance, which weakens the insulation recovery characteristics.

Therefore, the electric conduction path due to the residual arc at the current zero point is more easily formed between the two contacts by the arc runner, and the conduction path has a problem that leads to the failure of the fault current.

The present invention has been proposed in order to solve the problems of the prior art as described above, by configuring the arc runner configured in the low-voltage breaker / switchgear arcuate in a discontinuous multi-stage, remaining between the two contacts at the current zero point of the break It is intended to improve the insulation recovery characteristics between the fixed arc contact point and the movable arc contact point by discontinuous disconnection of the energization path by the discontinuous multi-stage arc runner even though the residual arc is still present in the arc extinguisher.

1 is a view showing the configuration of a conventional low pressure circuit breaker / switchgear fixed arc contact and movable arc contact and the arc runner.

Figure 2 is an exploded perspective view showing one embodiment of a discontinuous multi-stage arc runner applied to the present invention.

Figure 3 is a perspective view showing a state in which the discontinuous multi-stage arc runner applied to the fixed arc contact applied to the present invention.

Figure 4 is a side view showing a state in which the discontinuous multi-stage arc runner applied to the fixed arc contact applied to the present invention.

※ Explanation of code about main part of drawing ※

10: fixed arc contact 11: fixed arc contact

12: fixed arc contact terminal 20, 25: arc runner

21: end member 22: center member

23: start member 24: insulating member

30: movable arc contact 40: arc

In order to solve the above technical problem, the present invention is to enable the low-voltage circuit breaker / switchgear to block the short-circuit current by extinguishing the arc generated when the movable contact is separated from the fixed contact by the fault current or fault current. Discrete multi-stage arc runners that serve to move arcs to fixed arc contact terminals.

The arc runner is disposed at the upper end of the fixed arc contact as in the prior art, and has a structure divided into several.

Each of the divided members may be attached to an upper surface of the fixed arc contact via an insulating member.

Hereinafter, a preferred embodiment according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

Figure 2 is a perspective view showing the overall structure of one embodiment of an arc runner to which the present invention is applied.

In the present invention, as shown in Figure 2, the insulating member 24 is coupled to the upper surface close to the fixed arc contact contact portion 11 of the fixed arc contact 10, the low pressure circuit breaker / switchgear on the upper portion of the insulating member 24 The discontinuous multi-stage arc runner 25 for the extinguishing unit is coupled.

The insulating member 24 has a shape similar to that of the conventional arc runner 20, and has a shape of a thin rectangular plate, and the tip end of the insulating member 24 has a fixed arc contact 10 toward the fixed arc contact contact portion 11. It is fixed to the upper end surface, the other end of the insulating member 24 is bent upward and is configured to be spaced apart from the fixed arc contact (10).

The insulating member 24 is positioned between the upper end surface of the fixed arc contact 10 and the lower end surface of the arc runner 25, so that the arc runner 25 is more electrically independent from the fixed arc contact 10. In this way, the blocking performance is further improved, and at the same time, the members 21, 22, and 23 of the divided arc runner 25 are mechanically fixed.

The insulating member 24 may have a somewhat deformed shape as long as it can play the above-described role.

Discontinuous multi-stage arc runner 25 for the low-voltage breaker / switchgear extinguishing portion of the present invention is a magnetic plate such as iron (Fe) in this embodiment is divided into three parts, the starting member 23, the center member 22, The termination member 21 has an arrangement structure spaced apart so as not to sequentially contact.

The start member 23 has a shape of a substantially rectangular thin plate, is coupled to one side of the top surface of the insulating member 24 coupled to the fixed arc contact 10, the arc (40) of the fixed arc contact A part of the arc runner 25 serves to guide the terminal portion 12 side.

The center member 22 has a rectangular shape similar to the start member 23, but has a structure in which a semicircular groove is recessed on the side opposite to the start member.

As such, the semicircular grooves are formed in the center member so that when the arc 40 in the plasma state enters the semicircular grooves, the driving magnetic field of the grid formed around the arcs 40 can receive more force, and thus the fixed arc It serves to facilitate the arc 40 to move easily to the contact terminal portion 12 side.

Since the arc runner 25 is made of a magnetic material such as iron (Fe), if there is no semicircular groove, the magnetic field is absorbed and shielded by the magnetic material to send the arc 40 to the terminal portion 12 of the fixed arc contact. The force becomes smaller.

The semi-circular groove formed in the center member 22 may have a similar function even if the semi-circular groove has a different shape rather than a semi-circular shape.

The center member 22 is spaced apart from the starter member 23 by a distance that can be insulated from the atmosphere and fixed to the insulation member 24.

The end member 21 has a shape of a thin rectangular plate having a central portion bent downward along a line perpendicular to the arc advancing direction.

The bent one side portion of the termination member 21 is disposed to face the central member 20, spaced apart from the contact with the central member 21, and fixed to the top surface of the insulating member 24. The bent other side of the termination member 21 is disposed downwardly inclined toward the fixed arc contact terminal portion 12 but is positioned higher than the upper surface of the fixed arc contact 10 by a distance corresponding to the thickness of the insulating member 24. In parallel to the top surface of the fixed arc contact.

Therefore, the arc runner 25 of the present invention is composed of a discontinuous multi-stage and at the same time longer than the conventional arc runner 20 toward the fixed arc contact terminal portion 12, so that the arc 40 is fixed to the fixed arc contact terminal portion 12. It has a feature that makes it better communicated.

The separation distance between the start member 23 and the center member 22 and the separation distance between the center member 22 and the termination member 21 may be about 1 mm or so in which low voltage can ensure insulation in the atmosphere.

3 is a perspective view showing a state in which the discontinuous multi-stage arc runner 25 to which the embodiment of the present invention is applied is coupled to the fixed arc contact 10, the arc runner 25 and the fixed arc contact 10 It can be seen that the insulating member 24 described above is coupled between the).

4 is a side view showing a state in which the discontinuous multi-stage arc runner 25 applied to the fixed arc contact point 10 applied to the present invention, between the arc runner 25 and the fixed arc contact point 10 of the present invention. It can be seen that the insulation member 24 is present in the arc runner 25 is not directly coupled to the fixed arc contact (10).

As in the present invention, the arc runner 25 is divided into several parts to be spaced apart from each other. When the fault current is in the large current region of the sinusoidal wave, even if the arc runner 25 is discontinuously connected, a large fault current and a strong driving magnetic field are obtained. The arc 40 is guided to the fixed arc contact terminal portion 12 by the arc, and in the small current region, the arc moved toward the terminal portion 12 of the fixed arc contact even if the residual arc is present in the arcuate portion due to the weakening of the driving magnetic field. 40 can easily disconnect the energization path by the discontinuous multi-stage arc runner 25.

As described above, in the present invention, the arc runner is divided into a plurality of discontinuous multi-stage types, so that even if the residual arc remaining between the two contacts at the current zero, which is the current interruption point of the sinusoidal fault current, is still present in the extinguishing portion, There is an effect that the breaking performance can be further improved by disconnecting the energization path by the type arc runner.

In addition, the present invention is configured to be separated between the upper surface of the fixed arc contact and the lower surface of the arc runner to which the fixed contactor and the arc runner are bonded by an insulator, thereby further improving the breaking performance.

In addition, the present invention can easily improve the performance without significantly changing the existing product production line, it can see the effect of cost savings in terms of economy.

Claims (5)

In the arc runner for the low-voltage breaker / switchgear arc extinguisher, the arc runner is divided into two or more, and each of the dividing members is disposed so as to be spaced apart from each other so as to be discontinuous multistage Type arc runner. The arc runner is divided into three, the start member is coupled to the fixed arc contact contact side of the fixed arc contact upper end surface, the middle member is coupled to the fixed arc contact upper end surface between the start member and the end member Discontinuous multi-stage for low pressure circuit breaker / switchgear arc extinguisher, characterized in that the end member is fixed to the one side bent portion is fixed to the fixed arc contact upper end surface in a position facing the central member and the other bent portion is inclined downward toward the fixed arc contact terminal portion. Type arc runner. 3. The discontinuous multi-stage arc runner according to claim 2, wherein the central member has a semicircular groove at a side facing the start member. 4. The continuous multi-stage arc runner according to any one of claims 1 to 3, further comprising an insulating member between the arc runner and the upper surface of the fixed arc contact. 4. The low pressure circuit breaker / breaker of claim 3, wherein the insulation member is bent along a line perpendicular to the arc propagation direction, and the front end bent part is fixedly coupled to the upper end surface of the fixed arc contact point, and the other end bent part is inclined upward. Discontinuous multi-stage arc runner for extinguishers.