EP1302957A1 - Low-voltage high-power contact arrangement - Google Patents

Abstract

A contact bell (2) holds a switch blade (4) for a low-voltage power/high-rate current fuse. A protection (5) against accidental contact is provided for the contact bell that has an opening for passing a fuse blade through and blowout plates (7) shaped to it adjacent to the opening to act as electric arc blowout devices.

Description

TECHNICAL AREA

The present invention relates to a contact arrangement for NH fuse switch disconnectors, NH fuse switch disconnectors or the like with a contact tulip for receiving a NH fuse and with a contact protection for the contact tulip, which with an opening for the passage of the safety knife and adjacent to it Opening is provided with molded extinguishing plates as an arc extinguishing agent.

STATE OF THE ART

Such contact arrangements are known and also in practical use. You can be designed with one or more poles. The NH fuse is usually on the underside a switch cover attached to the disconnector or the load switch is pivotable or attached by parallel guides. Especially when switching off, when the knife of the NH fuse is pulled out of its contact tulip (s), an arc arises. The quenching plates help to extinguish this arc.

Quenching chambers, on the other hand, are also extinguishing agents on such contact arrangements known that with several approximately u-shaped and with a mutual spacing stacked quenching plates are provided. They are extinguishing Extinguishing chambers superior to the extinguishing plates. In terms of their structure, however, they are much more complex and expensive than extinguishing plates, which e.g. in the manufacture of the Protection against accidental contact as a plastic injection molded part without any additional effort molded ribs can be obtained.

NH fuse switch disconnectors, NH fuse switch disconnectors or similar devices, at which contact arrangements of the type under consideration are used are usually for a certain switching capacity according to IEC 60947-3. A standardized Switching capacity is for example AC22 at 690V. Another standardized switching capacity is AC 23 at 690 V. Because of the limited extinguishing effect of extinguishing plates Contact arrangements of the type mentioned in practice only up to the above Switching capacity of AC22 used. With larger switching capacities like the one mentioned AC23 uses contact arrangements with quenching chambers.

PRESENTATION OF THE INVENTION

The invention, as characterized in the claims, is a Contact arrangement created, which are in a simple manner to the above different circumstances by simply assembling one if necessary Extinguishing chamber can be adapted to the standard extinguishing plates.

Through the invention, the variety of types of NH fuse switch disconnectors, NH fuse switch disconnectors or the like, which is also beneficial to the Warehousing affects. Another advantage of the invention is that the Combination of extinguishing plates and extinguishing chamber has even better extinguishing properties than the parts mentioned alone.

The arcing chamber preferably comprises an insulating material housing, in a manner known per se which the extinguishing plates, especially those of u-shaped design, inserted and are held in it by guides. When the extinguishing chamber is attached, they grip Extinguishing plates with advantage between the legs of the U-shaped quenching plates in the Extinguishing chamber. The extinguishing chamber can be attached to the contact protection in particular by a snap connection. Further can between the Extinguishing plates a break-out bar and / or in the contact protection in the plug-on area of the Extinguishing chamber a breakout opening may be provided.

It is understood that within the scope of the invention, the extinguishing plates and the extinguishing chamber are shaped and should be dimensionally adapted to one another.

The properties of the contact device according to the invention can also still further can be improved by the fact that on the underside of the Protection against accidental contact between the legs of the contact tulip preferably somewhat resilient guide ribs as an insertion aid for the safety knife in the contact tulip are provided. Like the extinguishing plates, these guide ribs can be used without additional effort when designing the contact protection as a molded plastic part can be obtained by simply spraying. Through the through the guide ribs mediated centering of the safety knife practically hits this when switched on at the same time on both legs of the contact tulip, causing the contact bouncing and thus associated burn-off can be greatly reduced.

According to another preferred embodiment of the present invention, the Contact arrangement molded on means that a targeted removal of the opening or Ensure that the gases that are generated by the NH fuse are closed. Because if the Opening and / or closing the NH fuse when the contact is disconnected or when Gases generated during the contact closure are not deliberately removed from the contact areas, so there is a risk that due to the presence of these gases in high concentration Short circuits occur. Accordingly, the agents preferably conduct the gases in a targeted manner the conductor areas of the contact arrangement. This is accomplished by using the gases at least partially via a directly on the side of the NH fuse facing away Contact tulip arranged upper discharge opening and a related Discharge channel discharged upwards from a housing formed by the contact protection become. As an alternative or in addition, it is possible to use at least some of the gases arranged directly on the side of the contact tulip facing away from the NH fuse lower discharge opening into a housing interior formed by the contact protection upwards dissipate, in which case ventilation slots are arranged accordingly on the housing which the gases can escape from the inside of the housing and possibly agents are arranged, which do not allow the gases to flow back into the area of the fuse.

More specifically, such a preferred embodiment can be realized in that at least one discharge channel is formed on the inside (ie in the direction of the housing interior) at an opening in the contact protection substantially directly on the side of the extinguishing plates facing away from the NH fuse, said discharge channel being connected to the housing interior in the direction of the Contact tulip is connected via an upper discharge opening. This discharge channel preferably has two side walls (in particular essentially perpendicular to the front cover of the housing) and a horizontal base, and furthermore preferably has an upwardly curved base on the side facing away from the NH fuse. This curvature serves to not only remove the gases that typically develop explosively when opening them upwards, but also that the gases are controlled and removed as efficiently as possible from the entire contact arrangement by additionally leading them to the front. To stabilize this construction, at least one longitudinal web is particularly preferably arranged between the extinguishing plates, which extends at least to the horizontal bottom of the discharge channel, that is to say which first extends in the gap between the two extinguishing plates and then in the upper discharge opening (the gap between the two extinguishing plates and the discharge opening are not separated from one another, but form a large opening). The removal of the hot gases from the housing can be controlled even better by further arranging a vertical inner partition (essentially perpendicular to the plane of the contact tulip) on the inside of the contact tulip facing away from the NH fuse, and by arranging this vertical inner partition Has recess, the upper part of which forms the upper discharge opening, and the lower part of which forms a lower discharge opening, the at least one longitudinal web preferably also extending over the lower discharge opening, and particularly preferably additional lateral longitudinal webs essentially parallel to the at least one longitudinal web in the These additional webs serve in particular to protect against contact.
Further preferred embodiments of the present invention are described in the dependent claims.

BRIEF EXPLANATION OF THE FIGURES

Fig. 1

in einer quer geschnittenen Teildarstellung (Schnitt A-A in Fig. 5) einen NH-Sicherungslasttrennschalter nach der Erfindung mit aufgesteckter Löschkammer;

Fig. 2

in gleicher Darstellung den NH-Sicherungslasttrennschalter ohne die Löschkammer;

Fig. 3

den NH-Sicherungslasttrennschalter in einer längs geschnittenen Teildarstellung (Schnitt B-B in Fig. 5);

Fig. 4

in gleicher Darstellung den NH-Sicherungslasttrennschalter ohne die Löschkammer;

Fig. 5

eine perspektivische Teildarstellung des NH-Sicherungslasttrennschalters mit aufgesteckter Löschkammer;

Fig.6

in gleicher Darstellung den NH-Sicherungslasttrennschalter, wobei die Löschkammer separat und getrennt nach ihren Teilen dargestellt ist;

Fig. 7

a) ein zweites Ausführungsbeispiel eines NH- Sicherungslasttrennschalters ohne aufgesetzte Löschkammer von hinten in perspektivischer Ansicht; b) das zweite Ausführungsbeispiel mit aufgesetzter Löschkammer von hinten in perspektivischer Ansicht;

Fig. 8

a) das zweite Ausführungsbeispiel gem. Fig. 7a) von vorn in perspektivischer Ansicht; b) das zweite Ausführungsbeispiel gem. Fig. 7b) von vorn in perspektivischer Ansicht;

Fig. 9

a) das zweite Ausführungsbeispiel gem. Fig. 7a) in einem Schnitt parallel zum Sicherungsmesser; b) das zweite Ausführungsbeispiel gem. Fig. 7b) in einem Schnitt parallel zum Sicherungsmesser; und

Fig. 10

a) einen perspektivischen Einblick von unten in das offene Gehäuse des zweiten Ausführungsbeispiels aus der Richtung der Sicherung ; b) einen weiteren perspektivischen Einblick von unten in das offene Gehäuse des zweiten Ausführungsbeispiels zur Sicherung.

The invention will be explained in more detail below on the basis of exemplary embodiments in connection with the drawing. Show it:

Fig. 1

in a cross-sectional partial view (section AA in Fig. 5) an NH fuse switch disconnector according to the invention with attached extinguishing chamber;

Fig. 2

in the same representation the NH fuse switch disconnector without the arcing chamber;

Fig. 3

the NH fuse switch disconnector in a longitudinally cut partial view (section BB in Fig. 5);

Fig. 4

in the same representation the NH fuse switch disconnector without the arcing chamber;

Fig. 5

a partial perspective view of the NH fuse switch disconnector with attached extinguishing chamber;

Figure 6

in the same representation the NH fuse switch disconnector, the arcing chamber being shown separately and separately according to its parts;

Fig. 7

a) a second embodiment of a NH fuse switch disconnector without an extinguishing chamber from behind in a perspective view; b) the second embodiment with the extinguishing chamber attached from the rear in a perspective view;

Fig. 8

a) the second embodiment acc. 7a) from the front in a perspective view; b) the second embodiment according to 7b) from the front in a perspective view;

Fig. 9

a) the second embodiment acc. 7a) in a section parallel to the safety knife; b) the second embodiment according to 7b) in a section parallel to the safety knife; and

Fig. 10

a) a perspective view from below into the open housing of the second embodiment from the direction of the fuse; b) a further perspective view from below into the open housing of the second embodiment for securing.

WAYS OF CARRYING OUT THE INVENTION

All figures show the same, but only partially shown and with 1 designated NH fuse switch disconnector. This can basically be single pole, however also be multi-pole. In Figures 5 and 6 is a multi-pole design recognizable. Only one pole is considered in the following, the ones explained Properties of this pole can also be transferred to the other poles in the case of multi-pole training are.

As can be seen particularly in FIGS. 1 and 2, the NH fuse switch disconnector comprises a contact tulip 2, which two resilient against each other Has contact arms 2.1 and 2.2. 3 is best in Figures 3 and 4 recognizable NH fuse denotes which one on both sides of a fuse body Security knife, of which the only shown in the figures with 4 is designated. In FIGS. 1-4, this safety knife 4 is separated by the contact tuple 2 added between their arms 2.1 and 2.2.

5 with a contact protection is designated, the area of the contact tulip 2 against User out (in the figures upwards) covers. It is in one piece and injection molded made of a plastic insulating material such as Made of polyamide. Right above the Contact tulip 2 has a feed-through opening 6 in contact protection 5, through which the fuse knife 4 for switching the NH fuse switch disconnector on and off is feasible. As already mentioned, the NH fuse is 4 Usually attached to a switch cover, not shown here, which often also is still pivoted. In this case, the NH fuse can be used together with swivel the switch cover around its pivot axis, as indicated by the arrows in Figures 3 and 4 is indicated.

In order to switch off, i.e. when pulling out the safety knife 4 from the Contact tulip 2 under load between the safety knife 4 and the contact tulip 2 To effectively extinguish the arcing that occurs, the NH fuse switch disconnector 1 is to be used one with two extinguishing plates 7. On the other hand, you can also use the extinguishing plates 7 an extinguishing chamber 8 can be installed if required.

The extinguishing plates 7 are as upstanding narrow ribs on both sides and along the Swivel opening 6 is injection molded onto the touch guard. At their in the Figures 5 and 6 rear upper corner they are with each other via a crossbar 7.1 connected. Also extends between this crosspiece 7.1 and the contact protection 5 another longitudinal web 7.2.

With switching capacities up to AC 22 at 690 V, the extinguishing plates 7 are usually sufficient Extinguishing media for the arc. For higher switching capacities such as AC 23 at 690 too achieve is provided within the scope of the invention, in addition to the one already mentioned Install the extinguishing chamber 8 on the extinguishing plates 7. The assembly can be advantageous by simply plugging it on.

As can be seen particularly in FIG. 6, the extinguishing chamber 8 comprises an insulating material housing 9 into which several (e.g. five to ten) approximately U-shaped extinguishing plates 10 are inserted and are stacked on top of each other. 6 is only one for the sake of simplicity Extinguishing sheet shown. In the quenching chamber housing 9 there are guides 11 for the quenching plates intended. To define the extinguishing chamber 8 on the extinguishing plates 7 according to FIGS. 1, 3 and 5 on the contact protection 5 is the arcing chamber housing 9 with snap hooks 12 provided which engage in snap-in openings 13 in the contact protection 5.

When the extinguishing chamber 8 is attached to the extinguishing plates 7, the two engage Quenching plates 7 between the u-shaped quenching plates 10 in the quenching chamber 8 and cover their u-legs on both sides. On the other hand, however, it is provided for the mentioned Longitudinal web 7.2 between the extinguishing plates 7 before the extinguishing chamber 8 is plugged on break out to the rear joining area of the sheets between their u-legs continue to expose. The connecting web 7.2 is advantageously used accordingly suitable predetermined breaking points. It is also provided that an area of the Protection against accidental contact 5, which is attached to the extinguishing chamber 8 below the rear Connection area of the quenching plates comes to lie to form as a breakout opening 14 and break out before plugging in the extinguishing chamber 8.

FIGS. 1 and 2 show a further advantageous embodiment of the NH fuse switch disconnector according to the invention, which consists of two Guide ribs 15, which is on both sides of the through opening 6 for the Safety knife 4 and the extinguishing plates 7 approximately opposite on the underside of the Protection against accidental contact 5 are formed. The guide ribs 15 are further designed so that they are a bit between the two legs 2.1 and 2.2 of the contact tulip 2nd intervene and thereby a centering and insertion aid for the insertion of the Form the safety knife 4 in the contact tulip 2 when switching on. With the help the guide ribs 15, the safety knife 4 comes in handy when turned on at the same time in contact with both contact leg limbs 2.1 and 2.2, which the unwanted contact bounces and contact burn-off can be significantly reduced. By The design of the guide ribs can also give way to any side Tolerances can be compensated with advantage. The two guide ribs 15 are like that Perforated plates 7, molded directly onto the contact protection 5 and in this respect form like that Extinguishing plates are an integral part of this.

Another exemplary embodiment of the present invention is shown in FIGS. 7 to 10 shown. Figures 7a) and 8a) show perspective views of the Embodiment without an extinguishing chamber 8, the figures 7b) and 8b) show corresponding perspective views of the embodiment with attached Extinguishing chamber 8. In this embodiment, the opening on which the Extinguishing chamber 8 is placed if necessary, not provided with a stripping plate, but always open, d. H. even when used without an extinguishing chamber 8.

In Fig. 7a) can be seen how in the surface of the housing, i.e. H. in contact protection 5 there is a hole immediately adjacent to the area of the extinguishing plates 7 in which hole a discharge channel 16 is arranged. The one facing away from the NH fuse 3 End area of the extinguishing plates 7, d. H. the slot between the two extinguishing plates 7, in which the longitudinal web 7.2 already mentioned above is arranged also expands in other words in the contact arrangement down to an upper discharge opening 26, which prevents gases from the contact tulip 2 from entering the discharge channel 16 allowed. The longitudinal web 7.2 between the two extinguishing plates is down in this case extended so that the upper discharge opening 26 is divided centrally by this longitudinal web 7.2. Laterally on both sides of this longitudinal web 7.2 are also for further Stabilization of the construction two lateral longitudinal webs 19 parallel to the longitudinal web 7.2 arranged. The gases accordingly pass through between these longitudinal webs 7.2 or 19 slots formed therethrough. Take over the two lateral longitudinal webs 19 also the task, especially in the absence of an extinguishing chamber 8 den Protection against accidental contact, which takes place under the sole presence of the central longitudinal web 7.2 Circumstances are not guaranteed to ensure. The discharge channel 16 has over a horizontal bottom 17, which is parallel to the upper housing surface and somewhat in the depth is staggered. In this special case, the recess has a depth of in the range of 8 to 15 mm, this depth of course also from the specification of the Contact arrangement and the associated size of the NH fuse depends. So is for an arrangement of size 1 (250A) depth 9 mm, for size 2 (400A) and size 3 (630A) 12 mm. The discharge channel 16 is laterally delimited by two side walls 18. The additional ventilation slots 21 on the front side can also be seen in FIG. 7a) of the housing, as well as additional ventilation slots 22 in the upper side wall of the Housing. In this case, the upper side wall faces the viewer Designated side wall of the housing. The function of these additional ventilation slots will be seen below.

8a) additionally shows the special design of the discharge channel 16. This has namely in its area facing away from the fuse on a curved floor 20. The upward curvature of this bottom floor causes the usual Targeted explosion-like wave of hot gases is first transported parallel to the main direction of the safety knife 4, and then, due to the curvature, also targeted in the direction of insertion of the fuses, d. H. is led out of the front of the housing. This is required in order to to ensure optimal and efficient discharge of the gases.

7b) now shows the corresponding contact arrangement with the arcing chamber 8 attached. The housing 9 of the arcing chamber 8 has on its side facing away from the fuse each between the quenching plates 10 via ventilation slots 24, which are also one ensures efficient removal of the resulting gases from the area of the contacts, and dissipate any heat that may occur. In particular, in FIG. 7b) recognizable as the quenching chamber does not completely open the discharge channel 16 covered, but leaves an opening in the region facing away from the fuse, so that even with the extinguishing chamber 8 attached, the gases produced by the attached Extinguishing chamber should not be obstructed Accordingly, it also becomes clear why the curved region 20 of the bottom of the discharge channel 16 somewhat from the rear edge of the Extinguishing plates 7 is arranged offset. In other words, the arcing chamber 8 is located substantially over the flat bottom 17 of the discharge channel 16, d. H. in this area the escaping gas is initially only guided parallel to the front of the housing, and only behind that of the extinguishing chamber 9 are the gases through the curved bottom 20 out the recess of the discharge channel 16 is deflected out.

The corresponding FIG. 8b) shows the contact arrangement with the arcing chamber 8 attached gem. Fig. 7b) in a view from the side of the NH fuses.

9a) shows a section through a contact arrangement without an extinguishing chamber 8. this shows in particular how the management of those arising when the contact is made Gases within the enclosure continue to be optimized by a vertical interior Partition wall 25 is provided, which is the area in which the safety knife 4th is arranged, essentially separates from the further housing interior 28. The partition 25 now has at its top, d. H. the area facing the front of the housing via the above-mentioned upper discharge opening 26 which leads into the discharge channel 16 empties. Furthermore, a lower discharge opening 27 is arranged in the partition wall 25 which gases can escape into the housing interior 28. Accordingly occurs first part of the resulting gases through the upper exhaust opening 26, and a second part occurs in area 28. From there, the gases are now flowing back into the Area of contacts prevented by the partition 25. The gases are already over ventilation slots 21 and 22 mentioned above are removed from the housing interior 28. The combination of a direct discharge via the discharge channel 16 with an indirect one Removal via the lower discharge opening 27 first into the housing interior 28 and then out through the slots 21 and 22, with the vertical inner partition 25 it is prevented that the gases from the housing interior 28 back into the area of contacts, proves to be particularly efficient.

Fig. 9b) again shows the arrangement according to. Fig. 9a) with extinguishing chamber 8. How already mentioned above, the quenching chamber 8 is substantially above the flat area 17 of the bottom of 16, which also ensures an optimal chimney effect mounted extinguishing chamber 8 can be reached.

For the final illustration of the arrangement of discharge channel 16, vertical inner Partition 25, in particular the lower discharge opening 27, are in the figures 10a) and b) furthermore perspective views into the interior of a contact arrangement shown from below. In particular from Fig. 10a) it can be seen that the longitudinal web 7.2 and the two lateral longitudinal webs 19 not only via the upper discharge opening 26 extend, but also over the lower discharge opening 27. Again, one can increased stability of the construction can be guaranteed. In particular, however, is a further protection against contact guaranteed.

NAME LIST

1

NH fuse switch disconnectors

2

Contact tulip

2.1, 2.2

Contact arms of the contact tulip

3

NH fuse

4

fuse knife

5

contact protection

6

Through opening in the contact protection

7

extinguishing plates

7.1

Cross bar between the extinguishing plates

7.2

Longitudinal web between the extinguishing plates

8th

extinguishing chamber

9

Extinguishing chamber housing

10

splitters

11

Guides for quenching plates in the quench chamber housing

12

snap hooks

13

Snap openings in the contact protection

14

Breakout opening in the contact protection

15

guide ribs

16

discharge channel

17

flat bottom of 16

18

Sidewall of 16

19

side longitudinal bars in discharge opening 26/27

20

curved bottom of 16

21

Ventilation slots in 5

22

Ventilation slots in the upper / lower side wall of the housing

23

Partition between security areas

24

Ventilation slots in 9

25

vertical inner partition

26

upper discharge opening

27

lower discharge opening

28

housing interior

Claims (11)

Contact arrangement for NH fuse switch disconnectors (1), NH fuse switch disconnectors or the like with a contact tulip (2) for receiving a knife (4) of an NH fuse (3) and with a contact protection (5) for the contact tulip (2), which with an opening (6) for the passage of the safety knife (4) and adjacent to this opening (6) is provided with molded-on extinguishing plates (7) as an arc extinguishing agent, characterized in that an extinguishing agent in addition to the extinguishing plates (7) is only required if required there is provided an extinguishing chamber (8) which can be fitted with extinguishing plates (10). Contact arrangement according to claim 1, characterized in that the quenching chamber (8) comprises an insulating material housing (9) into which the quenching plates (10) are inserted and held by guides (11). Contact arrangement according to one of the preceding claims, characterized in that the quenching plates (10) are approximately U-shaped and that the quenching plates (7) with the quenching chamber (8) installed between the legs of the U-shaped quenching plates (10) in the quenching chamber (8 ) intervene. Contact arrangement according to one of claims 1 to 3, characterized in that a break-out web (7.2) is provided between the extinguishing plates (7), a transverse web (7.1), which is preferably arranged essentially on the upper edge of the extinguishing plates (7) Extinguishing plates (7) connects to each other, and on which the break-out web (7.2) is preferably formed with its upper end. Contact arrangement according to one of Claims 1-4, characterized in that a break-out opening (14) is provided in the contact protection (5) in the plug-on area of the arcing chamber (8). Contact arrangement according to one of claims 1-5, characterized in that the arcing chamber (8) on the contact protection (5) in the plugged-in state, preferably by a snap connection (12, 13), can be fixed. Contact arrangement according to one of claims 1-6, characterized in that on the underside of the contact guard (5) facing the contour tulip (2) two guide ribs (15) engaging between the legs (2.1, 2.2) of the contact bell (2) as an insertion aid for the safety knife (4) are provided in the contact bell (2). Contact arrangement according to one of the preceding claims, characterized in that means (16, 17, 18, 20, 25, 26, 27) are arranged which ensure a targeted removal of the gases produced when the NH fuse (3) is opened or closed. Contact arrangement according to claim 8, characterized in that the means (16,17,18,20,25,26,27) selectively remove the gases from the contact areas of the NH_Sicherung (3) by the gases at least partially via a directly on the NH fuse (3) facing away from the contact tulip (2) arranged upper discharge opening (26) and a discharge channel (16) connected therewith are discharged upwards from a housing formed by the contact protection (5), and / or at least partially via a are drained upwards directly on the side of the contact tulip (2) facing away from the NH fuse (3) into a housing interior (28) formed by the contact protection (5), ventilation slots (21, 22) being arranged, through which the gases can escape from the inside of the housing (28) to the outside. Contact arrangement according to one of claims 8 or 9, characterized in that at least one discharge channel (16) is integrally formed on an opening of the contact protection (5) directly on the side of the extinguishing plates (7) facing away from the NH fuse (3), which communicates with the interior of the housing (28) in the direction of the contact tulip (2) via an upper discharge opening (26), which has two side walls (18) and a flat bottom (17), and which is preferably on the NH fuse (3 ) facing away from one another has an upwardly curved bottom (20), in particular preferably at least one longitudinal web (7.2) being arranged between the extinguishing plates (7), which extends at least to the horizontal bottom (17) of the discharge channel (16). Contact arrangement according to claim 10, characterized in that in the housing interior (28) on the NH fuse (3) facing away from the contact tulip (2) a vertical inner partition (25) is arranged substantially perpendicular to the plane of the contact tulip (2) , and that this vertical inner partition (25) has a recess, the upper part of which forms the upper discharge opening (26) and the lower part of which forms a lower discharge opening (27), the at least one longitudinal web (7.2) preferably also extending over the lower discharge opening (27), and in particular preferably additional lateral longitudinal webs (16) are arranged substantially parallel to the at least one longitudinal web (7.2) in the recess.

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