CN103117197B - For the arc-chutes device of electromagentic switching apparatus - Google Patents

Abstract

The invention relates to an arc extinguishing chamber arrangement for an electromagnetic switching device, in particular for a circuit breaker, comprising: an arc extinguishing lamination stack; a baffle insert adjoining it; In the contact slider arrangement of the element, the movable switching contact element is positioned opposite the fixed switching contact element. The invention is characterized in that elastic profiles (12, 13) are arranged on the shutter insert (1) and are designed in such a way that the shutter insert (1) is firmly positioned against the housing wall of the electromagnetic switching device and the between arc laminations.

Description

Interrupter devices for electromagnetic switching devices

technical field

The invention relates to an arc extinguishing chamber arrangement for an electromagnetic switching device, in particular for a circuit breaker, having: an arc extinguishing lamination stack; The contact slider device of the switch contact element, the movable switch contact element is positioned opposite to the fixed switch contact element.

Background technique

Circuit breakers, especially low-voltage circuit breakers, are electromagnetic automatic switches in the event of a short circuit. In principle, its mode of operation corresponds to that of a line protection switch. They are mostly equipped with thermal and magnetic releases and therefore have the same structural elements as circuit breakers. However, they are designed for larger set currents and, in addition, unlike line protection switches, the trip units of circuit breakers can be partially adjusted individually. In the low voltage range, the switch is also used as a motor protection switch.

The task of the circuit breaker is to protect the equipment connected behind, especially the three-phase motor, from damage caused by overload or short circuit. Among them, the circuit breaker should shut off the current related to the grid protection device. If there is a gas between the two poles, the ionization is effected by a flashover at a correspondingly high voltage difference between the two poles and a self-sustaining gas discharge, which is also referred to as an arc, is formed. In addition, this plasma not only carries the current, but also shortens the life of the components and, under high currents, may even damage the switch. Unlike disconnectors, circuit breakers are designed in such a way that, without damaging the switch, the arc that occurs when opening the switch contacts is quickly dissipated and thereby interrupts the current flow.

In circuit breakers with a high breaking capacity, in particular up to 100 kA at a rated current of up to 80 A, a particular problem is that, due to the high pressures that develop, in the event of such a large short circuit, the The load on the walls of the interrupter, ie in particular on the lower part of the circuit breaker, is particularly high. For such a tripping process, the housing walls may bend outwards or cause cracks in the upper part of the circuit breaker. In the worst case, the upper part is broken off.

In the event of a short circuit, circuit breakers with a high interrupting capacity are subjected to high interrupter pressures of up to 7.5 bar, to which a likewise high plasma discharge is associated. A gap width of 0.1 to 0.2 mm is sufficient to enable the plasma to escape from the intended trajectory. This also applies to the arc-extinguishing lamination stacks and the shutter inserts which lie next to each other. For high interrupting capacities, another problem is the position of the baffle insert and the arc stack relative to each other. It must be ensured that the two elements stand relative to each other in such a way that the tracks for the plasma exchange do not overlap each other. In addition to this, the transition cross section between the arc-extinguishing lamination stack and the baffle insert has changed suddenly from a large cross-section to a small cross-section. This leads to the appearance of eddy currents, which in turn have a detrimental effect on the arc.

Contents of the invention

Accordingly, the object of the present invention is to provide an arc chamber arrangement which has improved performance at high interrupting capacities.

This object is achieved by an interrupter arrangement. Embodiments and developments can be used alone or in combination with each other.

According to the invention, this object is achieved by an arc chute arrangement for an electromagnetic switching device, in particular for a circuit breaker, having: an arc extinguishing lamination stack; a shutter insert adjoining it; and The contact slide arrangement comprises a movable switching contact element which is positioned opposite a fixed switching contact element. In this case, the invention is characterized in that a spring profile is arranged on the flap insert, which is designed such that the flap insert is firmly positioned between the housing wall of the electromagnetic switching device and the quenching lamination stack. Therein, compliance with all tolerance ranges is ensured in the case of simultaneous mountability. Flashover between two adjacent arc-extinguishing lamination channels is avoided by means of the elastic contour.

The baffle insert according to the invention is preferably designed as a square, with two parallel and opposite side walls and two side walls connecting the two side walls. Furthermore, the baffle insert has a front side and a bottom side. A cover is molded onto the front side, which is designed, for example, to accommodate fixed switching contact elements.

Spacers (Abstandshalters) are arranged on the two side walls arranged parallel to each other, which protrude outwards relative to the other two side walls arranged parallel to each other and realize the baffle insert (including arc extinguishing laminations) Optimum positioning within the switchgear. On one side wall, parallel slots are preferably arranged one above the other, which form a channel for the sorted plasma discharge. Furthermore, two elastic profiles are preferably designed on the side wall with the narrow hole, which extend downward parallel to the narrow hole on the side wall.

The elastic contour is preferably designed as an L-shape or wedge-shaped with two legs, one leg being designed as a protrusion of the side wall and the other leg forming an angle of 90° to the first leg or side wall. The elastic contour is preferably arranged on the left and right of the narrow opening and is preferably subdivided into three subregions, two of which are connected to one another by a third subregion in order to produce a confluence or wedge shape for the elastic contour as a whole. The elastic contours 12, 13 on the shutter insert 1 enable the shutter insert 1 to be firmly pressed between the housing wall of the electromagnetic switching device and the arc-extinguishing lamination stack.

In another embodiment of the baffle insert according to the invention it is provided that the baffle insert and the arc-extinguishing lamination stack are designed to be locked to each other. Two functions are realized through the locking device between the baffle insert and the arc extinguishing laminations. On the one hand, the positions of the two parts are fixed relative to each other, so that no overlapping of the aperture contours occurs. On the other hand, although in the form of the shutter insert being completely pressed in, a clear feedback during assembly is achieved by means of the locking device. The locking device can be designed in the form of locking pegs and recesses.

In another embodiment, according to the present invention, a streamlined transition section is designed from the baffle insert to the arc-extinguishing laminations. The streamlined transition section prevents eddy currents due to this flow-friendly shape. A clean discharge of the plasma is achieved instead of the diffuse discharge typical of eddy currents, whereby the risk of arcing between individual phases increases.

The interrupter arrangement according to the invention for an electromagnetic switching device, in particular for a circuit breaker, is characterized in that a high breaking capacity. A structural modification is the elastic contour on the shutter insert, which is designed in such a way that the shutter insert is always firmly pressed between the housing wall of the electromagnetic switching device and the arc-extinguishing lamination stack. Flashover between two adjacent arc-extinguishing lamination channels is thereby avoided. A further structural change consists in the locking device between the shutter insert and the arc-extinguishing lamination stack, which ensures two functions. On the one hand, the positions of the two parts are fixed relative to each other, so that no overlapping of the aperture contours occurs. On the other hand, a clear feedback during the assembly process is achieved by means of the locking device. The third structural measure on the baffle insert consists in a streamlined design of the transition section in order to avoid eddy currents due to this flow-friendly shaping. A clean plasma discharge is thus achieved.

Description of drawings

Further advantages and embodiments of the invention are explained below on the basis of exemplary embodiments and with reference to the drawings.

It schematically shows:

Figure 1 shows a first embodiment of a baffle insert according to the invention in a perspective view;

FIG. 2 shows a second embodiment of a barrier insert with locking means according to the invention in a perspective section view;

FIG. 3 shows in perspective an internal view of the barrier insert according to the invention with locking means according to FIG. 2;

FIG. 4 shows a top view of the arrangement of arc-extinguishing laminations and baffle inserts in section;

FIG. 5 shows the baffle insert according to FIG. 4 with flow-friendly channels in a perspective sectional view;

FIG. 6 shows a further embodiment of the baffle insert according to the invention in perspective view.

detailed description

FIG. 1 shows a first embodiment of a baffle insert 1 according to the invention, which is preferably designed as a square with two parallel opposite side walls 2 , 3 and a connection between the two side walls 2 , 3 The two side walls 4,5. Furthermore, the panel insert 1 has a front side 6 and a bottom side 7 . A cover 8 is molded onto the front side 6 , which is designed, for example, to accommodate fixed switching contact elements.

Arranged on the side walls 4 , 5 are partition walls 9 , 10 , which protrude relative to the side walls 2 , 3 and enable optimal positioning of the shutter insert 1 (including the quenching laminations) within the switching device. Parallel slots 11 are preferably arranged one above the other on the side wall 4 and form passages for the sorted plasma discharge. Furthermore, elastic contours 12 , 13 are formed on the side wall 4 , which extend downward parallel to the slot 11 in the side wall 4 .

The elastic contours 12 , 13 are preferably L-shaped with two legs 14 , 15 , wherein the leg 14 is designed as a protrusion of the side wall 4 and the leg 15 forms an angle of 90° to the leg 14 or the side wall 4 . The elastic profiles 12, 13 are preferably arranged on the left and right sides of the narrow hole 11 and are preferably divided into three subregions 16, 17, 18, wherein the subregions 16 and 18 are connected to each other by the subregion 17 and are preferably produced as a whole Confluence shape for elastic profiles 12 , 13 . Elastic contours 12 , 13 on the shutter insert ensure that the shutter insert 1 is always firmly pressed between the housing wall of the electromagnetic switching device and the quenching lamination stack.

FIG. 2 shows a second embodiment of a barrier insert 1 according to the invention with a locking device. The side wall 5 is shown in this perspective sectional view with narrow holes 11 which form channels for the sorted plasma exhaust. On the side wall 5 close to the front face 6 with the roof 8, a locking peg 19 is shown. The locking peg 19 is used to lockingly connect the baffle insert 1 with the arc extinguishing lamination stack. Both functions are ensured by the locking device. On the one hand, the positions of the two components consisting of the shutter insert 1 and the arc-extinguishing lamination stack are fixed relative to each other so that no overlapping of the aperture contours occurs. On the other hand, a clear feedback during the assembly process is achieved by means of the locking device. The locking peg 19 can also be seen from FIG. 3 , which shows a front view according to the side wall 5 .

FIG. 4 shows an arrangement consisting of a barrier insert 1 according to the invention and an adjoining arc-extinguishing lamination 20 . The dotted surface 21 represents the current transition section, which forms a vortex 23 through the constriction 22 and would not allow a defined plasma discharge. The eddy currents 23 previously produced the discharge of scattered plasma, which increases the risk of arcing between the individual phases. For the baffle insert 1 according to the invention described here, the constriction 22 is dispensed with and thus a streamlined transition section is achieved which avoids turbulence due to this flow-friendly shaping. Clean plasma discharge is thus achieved. To this end, FIG. 5 shows a perspective representation of the flow-optimized discharge channel 24 .

FIG. 6 shows another embodiment of a baffle insert 1 according to the invention, which is likewise preferably designed as a square, with two parallel oppositely arranged side walls 2, 3 and connecting the two side walls 2, 3 of the two side walls 4,5. Furthermore, the panel insert 1 has a front side 6 and a bottom side 7 . A cover 8 is molded onto the front side 6 , which is designed, for example, to accommodate fixed switching contact elements.

Arranged on the side walls 4 , 5 are partition walls 9 , 10 , which protrude relative to the side walls 2 , 3 and enable optimal positioning of the shutter insert 1 (including the quenching laminations) within the switching device. On the side wall 4 are preferably arranged parallel one above the other slots 11 , which form passages for the sorted plasma discharge. Furthermore, elastic contours 12 , 13 are formed on the side wall 4 , which extend downward parallel to the slot 11 in the side wall 4 .

The elastic profiles 12, 13 are preferably arranged on the left and right sides of the narrow hole 11 and are preferably divided into three subregions 16, 17, 18, wherein the subregions 16 and 18 are connected to each other by the subregion 17 and are preferably produced as a whole A wedge shape for the elastic contours 12 , 13 in each case, which tapers toward the base 7 . Elastic contours 12 , 13 on the shutter insert ensure that the shutter insert 1 is always firmly pressed between the housing wall of the electromagnetic switching device and the arc-extinguishing lamination stack.

The interrupter arrangement according to the invention for an electromagnetic switching device, in particular for a circuit breaker, is characterized in that a high interrupting rate can be achieved even at high interrupter pressures by means of a structural change on the shutter insert. flow capacity. A structural modification is the elastic contour on the shutter insert, which is designed in such a way that the shutter insert is always firmly pressed between the housing wall of the electromagnetic switching device and the arc-extinguishing lamination stack. Flashover between two adjacent arc-extinguishing lamination channels is thereby avoided. A further structural change consists in the locking device between the shutter insert and the arc-extinguishing lamination stack, which ensures two functions. On the one hand, the positions of the two parts are fixed relative to each other, so that no overlapping of the aperture contours occurs. On the other hand, a clear feedback during the installation process is achieved by means of the locking device. The third structural measure on the baffle insert consists in a streamlined design of the transition section in order to avoid eddy currents due to this flow-friendly shaping. Clean plasma discharge is thus achieved.

Claims (8)

1. An arc extinguishing chamber device, which is used for an electromagnetic switch device, the arc extinguishing chamber device has: an arc extinguishing lamination group; a baffle insert (1) adjacent to the arc extinguishing lamination group; and a movable The contact slider device of the switch contact element, the movable switch contact element is positioned opposite to the fixed switch contact element, characterized in that, in the direction of the baffle insert (1) in the electromagnetic switch device Elastic profiles (12, 13) are arranged on the sides of the housing wall of the electromagnetic switching device, and the elastic profiles are designed in such a way that the shutter insert (1) is firmly positioned on the housing wall of the electromagnetic switching device and the extinguisher Between the arc lamination groups, the baffle insert is designed as a square, with: two parallel and opposite side walls, two side walls connecting the two side walls, a front surface and a bottom surface, and the front surface is molded A top cover is formed, which is designed to accommodate the fixed switching contact element. 2. The arc extinguishing chamber device according to claim 1, characterized in that the arc extinguishing chamber device is used for a circuit breaker. 3. The arc extinguishing chamber device according to claim 1, characterized in that, the baffle insert (1) is L-shaped. 4. The arc extinguishing chamber device according to any one of claims 1 to 3, characterized in that, the elastic profile (12, 13) is designed on the side wall (4) of the baffle insert (1) And it has three subsections (16, 17, 18), wherein the elastic contours (12, 13) are designed as a confluence or wedge as a whole. 5. The arc extinguishing chamber device according to any one of claims 1 to 3, characterized in that, the baffle insert (1) and the arc extinguishing stack are designed to be locked to each other. 6. The arc extinguishing chamber device according to claim 4, characterized in that, the baffle insert (1) and the arc extinguishing stack are designed to be locked to each other. 7. The arc extinguishing chamber device according to any one of claims 1 to 3, characterized in that a streamlined transition section is designed from the baffle insert (1) to the arc extinguishing laminations. 8. The arc extinguishing chamber device according to claim 6, characterized in that a streamlined transition section is designed from the baffle insert (1) to the arc extinguishing laminations.