EP0971383A2 - Contact arrangement of a current switch - Google Patents

Abstract

The current contact device has a movable current contact (K1) which in the closed switch position cooperates with a second current contact (K2). This is done via a movable contact bridge (3) acted on by a bias spring (4), which is spaced from both current contacts in the open position of the switch. The movement of the contact bridge is effected via a bridge guide (A), mechanically coupled to one of the current contacts

Description

TECHNICAL AREA

The invention is based on current contact arrangements a current switch according to the preamble of claim 1.

STATE OF THE ART

With the preamble of claim 1, the invention takes to a prior art reference, as it is from DE 19524217 Al is known. There is one with a gaseous insulation and Circuit breaker filled with extinguishing agent specified Nominal current is carried over a contact bridge. The Contact bridge is rotatably supported and with a tension spring connected to the fixed contact arrangement. When opening the Circuit breaker forms between ends Support positions of the contact bridge and the two Contact arrangements one arc at a time in succession, so that there is sufficient gas pressure to also Safely extinguish low-current arcs.

The disadvantage here is that when separating this Only one arc arises and therefore for the Commutation of the current on the erosion contact only one Arc voltage corresponding to arc commutation Available.

PRESENTATION OF THE INVENTION

The invention as defined in claim 1 solves the task of current contact arrangements of a current switch continue to develop in such a way that at Separation of the switch contact two interruptions and thus two Arcs occur.

Advantageous embodiments of the invention are in the dependent claims defined.

An advantage of the invention is that when separating the Switch contacts overall a higher arc voltage that creates a faster commutation of the current guaranteed.

According to an advantageous embodiment of the invention these double power cuts by simple Guide elements can be achieved on either of the two Current contact arrangements are arranged.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1

in einem Ausschnitt einen Querschnitt der oberen Hälfte von Stromkontaktanordnungen eines doppeltunterbrechenden Stromschalters in Schließstellung mit einer Kontaktbrücke mit nockenförmigem Führungselement,

Fig. 2

Stromkontaktanordnungen gemäß Fig. 1 in geöffnetem Zustand,

Fig. 3 und 5

eine Prinzipdarstellung bzw. eine vereinfachte Schnittdarstellung der oberen Hälfte von Stromkontaktanordnungen eines doppeltunterbrechenden Stromschalters in Schließstellung mit einer Kontaktbrücke mit einem Zapfen, der in einem Führungsschlitz drehbar gelagert ist, und

Fig. 4 und 6

Stromkontaktanordnungen gemäß den Fig. 3 und 5 in geöffnetem Zustand.

The invention is explained below using exemplary embodiments. Show it:

Fig. 1

in a section a cross section of the upper half of current contact arrangements of a double-break current switch in the closed position with a contact bridge with a cam-shaped guide element,

Fig. 2

1 in the open state,

3 and 5

a schematic diagram or a simplified sectional view of the upper half of current contact arrangements of a double-interrupting current switch in the closed position with a contact bridge with a pin which is rotatably mounted in a guide slot, and

4 and 6

Current contact arrangements according to FIGS. 3 and 5 in the open state.

Not necessary to understand the invention Construction elements and the housing of the power switch are have been omitted from the drawings. The clarity because of parts shown in one piece can in practice design and manufacturing reasons for several Parts be composed.

WAYS OF CARRYING OUT THE INVENTION

In the figures, the same parts have the same reference numerals featured.

Fig. 1 shows a section of a sectional view circular cylindrical nominal current contact arrangement of a Circuit breaker or current switch in the closed state, wherein with (1) whose longitudinal axis is designated. A movable 1st Current contact arrangement (K1) and a fixed 2nd Current contact arrangement (K2) are by a contact finger or bridged by a contact bridge (3). This Contact bridge (3) is between a 1st end Switch contact (P1), which is in the closed state of the current switch is in pressure connection with the first current contact arrangement (K1), and a 2nd end switch contact (P2), which in Closed state of the power switch with the 2nd Current contact arrangement (K2) is in pressure connection, in a Bulge or a bridge guide element (A) cam-shaped educated. The contact pressure is set by means of a compression spring (4), which, on the one hand, in a recess in the second

Current contact arrangement (K2) and on the other hand in a recess the contact bridge (3) is generated.

At the 1st current contact arrangement (K1) is an electrical insulating current contact element (2) with a end contact surface (2A) rigidly attached, for. B. means a screw connection. This contact surface (2A) corresponds with the bridge guide element (A); it is in the closed state of the current switch slightly from the bridge guide element (A) spaced.

Fig. 2 shows the current contact arrangements of the current switch 1 in its open state. Compared to the The closed state is the 1st current contact arrangement (K1) in the direction an arrow (5) shifted to the right and thus also that Current contact guide element (2), which with its Contact surface (2A) against the bridge guide element (A) against the pressure effect of the compression spring (4) after the contact bridge (3) presses above, the contact bridge (3) with a Bridge stop (Al) on a counter stop of the 2nd Current contact arrangement (K2) is present. When opening the The first switch contact (P1) from the 1st current contact arrangement (K1) without the Contact surface (2A) of the current contact guide element (2) on the Bridge guide element (A) rests so that there is a 1st Arc (B1) arises. The contact surface comes shortly afterwards (2A) to abut the bridge guide element (A) and press the Contact bridge (3) against the action of the compression spring (4) above until the bridge stop (Al) comes to a stop. After that the 2nd switch contact (P2) moves away from the 2nd Current contact arrangement (K2), so that there is a second arc (B2) arises, which is electrically in series with the 1st arc (B1) is switched and thus the arc voltage doubles.

3 and 5 show a schematic diagram and a Design variant of current contact arrangements one Current switch in the closed state, where a contact bridge (3 '), in contrast to the contact bridge (3) according to FIG. 1, as Bridge guide element has a cylindrical pin (8), around its axis the contact bridge (3 ') can be rotated. This Pin (8) is in an elongated hole or guide slot (7) a lower stop (9) in one on the 2nd Current contact arrangement (K2) attached slide guide (6) slidable. The compression spring (4) engages to the right of the pivot point of the Pin (8). When closed, the force of the Compression spring (4) onto the entire contact bridge (3 ') in such a way that the first and second switch contacts (P1, P2) are connected to the first and 2. Current contact arrangements (K1, K2) are pressed. The cone (8) is not in contact with the stop (9).

4 and 6 show current contact arrangements of the 3 and 5 in its open state, the pin (8) on the stop (9) of the guide slot (7) is present. If the 1st current contact arrangement (K1) at Shifting is shifted sideways to the right, then the right side of the contact bridge (3 ') by moving 1. Current contact arrangement (K1) no longer supported, so that the 1st Switch contact (P1) lifts and disconnects. This creates a 1. Arc (B1). Then the contact bridge (3 ') falls from the Compression spring (4) driven until its pin (8) against the stop (9) strikes. Then the contact bridge (3 ') leads under the continuing influence of the compression spring (4), a Rotational movement that leads to the opening of the 2nd switching contact (P2) leads, so that there is a 2nd arc (B2) in series to the 1st Arc (B1) arises.

LIST OF DESIGNATIONS

1

Longitudinal axis of the current switch

2nd

Actuator, current contact guide element

2A

cam-shaped contact surface of 2

3, 3 '

Contact bridges, contact fingers

4th

Spring, compression spring, leaf spring

5

arrow

6

Sliding guide

7

Current contact guide element, guideway, Guide slot in 6

8th

Spigot in 3 '

9

Stop of 7

A

cam-shaped bridge guide element in FIG. 3

A1

Bridge stop from 3

B1

Arc between P1 and K1

B2

Arc between P2 and K2

K1

movable current contact arrangement

K2

fixed current contact arrangement

P1, P2

end switch contacts of 3, 3 '

Claims (3)

Current contact arrangements of a current switch a) with at least one movable 1st current contact arrangement (K1), b) the in the closed state of the power switch via a movable contact bridge (3, 3 ') c) is in mechanical pressure connection with at least one second current contact arrangement (K2), characterized, d) that in the open state of the current switch, the contact bridge (3, 3 ') is separated from the two 1st and 2nd current contact arrangements (K1, K2) and e) that the contact bridge (3, 3 ') has a bridge guide element (A, 8), which is at least in the open state of the current switch with one of the current contact arrangements (K1, K2) in mechanical connection. Current contact arrangements according to claim 1, characterized in a) that the bridge guide element (A) between a 1st end switch contact (P1), which is in the closed state of the power switch with the 1st power contact arrangement (K1) in pressure connection, and a 2nd end switch contact (P2), which in the closed state the current switch is in pressure connection with the second current contact arrangement (K2), is cam-shaped, b) that the current contact guide element (2) on the 1st current contact arrangement (K1) rigidly attached and c) is electrically insulating. Current contact arrangements according to claim 1, characterized in a) that the bridge guide element is a pin (8) and b) that the current contact guide element is a guide track (7) for this pin (8) in a slide guide (6) which is rigidly connected to the second current contact arrangement (K2).

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