HU215878B - Electrical circuit breaker with electromagnetic actuator for high ratings - Google Patents

Abstract

The circuit breaker is fitted with an electromagnetic actuator (AE), comprising a magnetic circuit (7) in the form of an `H'. The circuit includes a first air gap (17) in which a mobile contact arm (5) is suspended and a second air gap (19) associated with a pivoting paddle (8). A hammer (9) is connected to the paddle (8) to reinforce the opening action of the contact arm (5). The hammer (9) is formed by an extended piece situated between the magnetic circuit (9) and the first compartment (30). This cooperates with the support (26) of the contact arm to block the passage between the first and second compartments after attraction of the paddle, and to free the passage after the return of the paddle to its separated position. <IMAGE>

Description

(54) Electric circuit breaker with magnet for actuators for high power circuits

EXTRACT

The electric circuit breaker with an electric magnetic actuator for high power circuits arranged in an insulated housing consisting of a stationary contact (3) and a movable contact (3) and a movable contact (3) associated with an electric magnetic actuator (AE) and an arc extinguishing chamber (6). consisting of a lower part, wherein the electric magnetic actuator (AE) has a vehicle (7) and comprises:

-the core (10) on which an excitation coil is mounted,

- a first air gap in which the movable contact lever (5) extends, in which the stationary contact (3) and the movable contact (4) are in contact with each other at a rest position, the stationary contact (3) and the movable contact (4) current is greater than a threshold,

- a lever (8) which cooperates with the polar surfaces of the yoke (7) and forms a second air gap (19) opposite the first air gap,

- a lever (9) associated with the lever (8) which actuates the movable contact lever (5) in the open direction after the magnetic attraction of the lever (8) extends to the pole surfaces of 10 pages (including Fig. 6). It is an object of the invention that the lever (9) is formed of an elongated part disposed between the yoke (7) and the upper part which, after the movable contact lever (5) holding means, closes the in the direction of closing the gap forming the passageway between the part 2 and the lower part, and after the return of the lifting chambers (8) to the separated position, the opening is formed in a cooperative manner.

HU 215 878 B

HU 215,878 Β

BACKGROUND OF THE INVENTION The present invention relates to an electric circuit breaker comprising a second electrical contactor and a movable contact member comprising an electric contactor and an electrical contact is and contains:

- a core on which a scintillation coil is affixed,

- a first step in which the movable contact arm extends, in which the stationary contact and the movable contact are in contact with each other at rest, the stationary contact and the movable contact being separated from each other in an active position, wherein the current is greater than a threshold,

- a lever arm which cooperates with the end face of the yoke to form a second air gap opposite the first air gap,

- a lever arm associated with the lever arm, which actuates the movable contact lever in the opening direction after the lever arm is locked to the pole surfaces by magnetic attraction.

It is known that by using an electric magnetic actuator in an electric circuit breaker, the contacts can be separated at very high speeds and thus very high interruption capacities can be achieved. However, extinguishing the arc produces ionized gases in the extinguishing chamber which tend to cause external phenomena. These phenomena are particularly undesirable on the front side side because the ionized gases released through the orifice move the handle.

It is an object of the present invention to provide an electrical circuit breaker which is high performance and does not cause external phenomena.

The object has been achieved by providing an electric circuit breaker in which the lever arm is formed by an elongated part disposed between the yoke and the upper part which, after the lever arm is locked to the yoke, forms a passageway between the upper part and the lower part. in the direction of closing the gap and then returning the lifting chambers to the separated position, it is formed cooperatively in opening the gap.

It is preferred that the connecting pin connecting the lever to the lever arm is located in the intermediate zone between the lever axis and the second air gap.

Preferably, the lever arm forms a shield fitted to the interior of the housing and the lead-through gap is located above the first air gap opposite the stationary contact.

It is preferred that the movable contact arm support means comprise stops cooperating with the mechanism and a support surface cooperating with the free end of the lever arm for closing the gateway gap.

The electric circuit breaker according to the invention will now be described in more detail with reference to the accompanying drawing, in which: Figure 1 is a schematic front view of an electric circuit breaker according to the invention;

Figure 2 is a perspective view of the actuator of the circuit breaker of Figure 1;

Figure 3 is a sectional view in the middle plane of the actuator shown in Figure 2 with the lever and lever in a rest position;

Figure 4 is a top view of Figure 3;

Figure 5 is a view similar to that of Figure 3 with the lever and lever in the operating position;

Figure 6 is a top view of Figure 5.

The circuit breaker 1 shown in Fig. 1 consists of a housing 2 enclosing a stationary contact 3, a movable contact mounted on the end of a movable contact arm 5, an arc extinguishing chamber 6 and various electrical connection portions enabling the terminals linking. The circuit breaker 1 further comprises an electric magnetic actuator AE which disconnects the contact 3 and the mobile contact 4 in the event of an error and disconnects them at high speed.

The AE electric magnetic actuator comprises a vehicle made of magnetic material, a pivoting lever 8 and a lever 9.

In Figure 2, the H-shaped yoke or magnetic circuit 7 comprises a cylindrical core 10 surrounded by a coil 34, the sides 11 and 12 of the yoke 7 being arranged parallel to one another and extending perpendicular to the axis of the core 10. The first end 13 of the side 11 faces the lever and the other end 14 is designated by the reference numeral 14. The other side 12 has a third end (not shown) facing the lever 8 and a fourth end designated 16. The first end 13 and the third end form common planar pole surfaces cooperating with the planar surface 18 of the lever arm. The second and fourth ends 14 and 16 form planar surfaces facing each other that surround the first air gap 17.

When the electric magnetic actuator AE is at rest, the lever arm 8 is located at a distance from the plane surface 13 of the yoke 7 and thereby forms a second air gap 19. The pivoting lever 8 is mounted on the PTO shaft 21 and the movable contact arm 5 is also pivotally mounted on another PTO shaft 22. The stationary contact 3 is located at the bottom of the air gap 17 and at least a portion of the movable contact 5 extends through the air gap 17. The lever arm 9 is an apparently elongated rectangle with one end pivotally attached to the connecting pin 23 disposed on the lever arm, the other free end 24 of the lever arm being disposed on the side of the movable contact cam 5 opposite the stationary contact 3.

The width of the lever 9 corresponds to the width of the housing 2.

3-6. Referring to Figures 1 to 4, the movable contact arm 5 is mounted at one end by means of retaining means 26, while the other end of the movable contact arm is provided with locking and separating the movable contact 4 and the movable contact latches

EN 215 878 Β have stops working with an executive mechanism (not shown). The holding device 26 further has a support surface 36 cooperating with the free end 24 of the lever 9.

In the lever arm 8, the connecting pin 23 of the lever arm 9 is located in the intermediate region between the camshaft 21 and the second air gap 19. The free end 24 of the lever arm 9 is separated from the support surface 36 by a passageway 28 in the form of a slot whose width can be varied according to the magnetization state of the electric actuator AE.

In the closed position of the stationary contact 3 and the movable contact 4 (see Figures 3 and 4), due to the nominal current flowing in the coil 34 of the electric magnetic actuator AE, the magnetic flux in the air gap 19 is insufficient to pull the lever 8 to the end 13 of the yoke. The lever 8 is held in this separated position by its return spring, and the lever 9 also remains stationary in the rest position. The gap 28 between the lever 9 and the holding means 26 of the movable contact lever 5 is as wide as possible and allows the contact area to be engaged with the upper portion 30 surrounding the mechanism.

When a short-circuit current occurs, the magnetic flux in the yoke 7 generates high electrical magnetic forces in the first air gap 17, causing the movable contact lever 5 to open (see Figures 5 and 6). At the same time, the lever 8 is attracted to the end 13 forming the pole surfaces of the second air gap 19 and moves the lever 9 in the same direction of movement. When the end of the lever 9 contacts the holding device 26, it accelerates the rotation of the movable contact pins 5 in its opening direction, and at the same time the gap 28 is closed. During the separation of the stationary contact 3 and the mobile contact 4, the ionized gases generated by the arc cannot escape into the upper portion 30 and remain trapped in the lower portion 32 which surrounds the arc extinguishing chamber 6. Thus, in addition to accelerating the movement of the movable contact arm 5, the ram 9 also has a function of providing a separating shield between the two upper portions 30 and the lower portion 32, and the gap 28 remains closed in the retracted position of the lever 8. the current in the coil does not change compared to a preset value. By closing the gap 28 in the arc extinguishing operation stage, gas is prevented from flowing back to the upper portion 30, in particular to the opening for the passage of the handle, and preventing any external phenomenon from occurring on the front of the housing 2.

Claims (4)

PATENT CLAIMS Figure 1 HU 215,878 Β Int Cl ⁶ : H01 H 71/00 1. An electrical circuit breaker with an electric magnetic actuator for high power circuits arranged in an insulated housing comprising a second lower portion comprising a top and a moving actuator associated with an actuating mechanism, an electric magnetic actuator, an arc extinguishing chamber, a fixed contact and a movable contact, contain: - the seed on which the scintillation coil is mounted, - a first air gap in which the movable contact arm extends, in which the stationary contact and the movable contact are in contact with each other at rest, the stationary contact and the movable contact being separated from each other in an active position, wherein the current is greater than a threshold; - a lever arm which cooperates with the end face of the yoke to form a second air gap opposite the first air gap, - a lever associated with the lever arm, which actuates the movable contact lever in the open direction after being locked to the pole surfaces by magnetic attraction, characterized in that it is formed by an elongated portion between the lever arm (9), the yoke (7) and the upper part (30) formed by closing means (26) of the movable contact arm (5) to close the gap (28) forming the passage between the upper part (30) and the lower part (32) after the lever arm (8) has been closed to the yoke (7). and then, after returning the lever arm (8) to the detached position, the slot (28) is cooperatively opened. Figure 2 New < to .TvTto ⁰⁰ áW ^a HU 215,878 Β Int Cl ⁶ : H01 H 71/00 Breaker according to Claim 1, characterized in that the connecting pin (23) connecting the lever (9) to the lever (8) is in the intermediate zone between the pivot axis (21) of the lever (8) and the second air gap (19). arranged. Breaker according to Claim 2, characterized in that the lever (9) forms a shield fitted to the inner part of the housing (2) and the slot (28) is located above the first air gap (17) opposite the stationary contact (3). . 4. Breaker according to any one of claims 1 to 3, characterized in that the holding means (26) of the movable contact arm (5) is provided with stops cooperating with the mechanism (31) and a support surface (36) cooperating with the free end (24) of the lever arm contain. HU 215,878 Β Int Cl ⁶ : H 01 H 71/00 Figure 4 σ · ⁶ ·