KR830001431Y1 - Double arc contact of circuit breaker - Google Patents

Abstract

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Description

Double arc contact of circuit breaker

1 is a plan view in which a part of a three-pole circuit breaker is cut to show one of the pole units employing a contact device embodying the present invention.

2 is a side sectional elevation view showing the mid-pole unit of a circuit breaker with actuators common to all units.

FIG. 3 is an end view of the arc-chufe end of the three movable contact devices of the circuit breaker as shown below. FIG.

The present invention generally relates to circuit breakers, and more particularly, to an increasingly progressive device of a circuit breaker.

Conventional circuit breakers designed to block faults and short-circuit currents are usually each equipped with several main contacts and, in addition, closed before the main contact is closed and opened after the main contact is opened to prevent undue arcing at the main contact. One arc contact is employed. These conventional contact devices have been and will continue to meet the purpose when used in breakers within medium breaking ratings. However, in order to increase the circuit breaker, in particular, the short-circuit current blocking capability, it is necessary to further improve the structure of the contact device.

It is an object of the present invention to meet such a need, and thus the present invention provides a movable contact position for moving a contact between a closed position and an open position for a fixed contact, and the movable contact device is moved from the closed position of the contact. Having at least one pole unit comprising an arc chute which receives and turns off the arc generated when moved, the movable contact device comprising a set of elongated contacts supported side by side to move simultaneously with each other, The two are arc contacts which are to be closed before the other contacts which are the main contacts and then open later and the arc contacts are spaced apart laterally so that at least one main contact is placed between the nets and extends into the arc chute and at one point to each other Equipped with a bent arc horn It is in the circuit breaker to the gong.

Adopting two spaced arc contacts with arc horns bent against each other, this new device is not only due to the fact that the two arc contacts, which themselves significantly increase the breaking capacity of the breaker, share the load with each other. The circuit breaker's ability to block circuits is increased by the increased speed of arc progress due to the presence of an arc horn that accumulates with a sword, assisting and guiding the arc to rapid movement with parallel arcs and arc suits that tend to move rapidly. It has been found to improve significantly. The use of the arc horns bent to each other allows the new contact device to be used in particular with standard arc shouts, such as the use of laminated plates, usually with V-shaped arc receiving slots. By making the convergence angle between the arc horns equal to the angle between the two sides of the nearly V-shaped slot, it can be used for applications that can be easily used. In addition, it may be more than one and at least one main contact is located between the arc contacts, or in other words, the arc contact is located outside one or possibly several main contacts, so that a considerable contact is generated. It has been found that during the early stages of the open contact operation, there is a significant improvement in switching the current from the main contact to the arc contact at the moment the main contact is disconnected.

Embodiments of the present invention will be described by way of example with reference to the accompanying drawings.

Referring to the drawings, an application of the present invention is shown as an example, and the circuit breaker indicated by reference numeral 3 is a circuit breaker of a type similar to that found in US Patent Nos. 3, 821, 607. In summary, the breaker is composed of an insulating housing 5 and a circuit breaker mechanism 7 supported therein.

The housing 5 consists of a base 9 and a cover 11, and the circuit breaker mechanism 7 consists of an actuator 13, a latch and trip device 15, and a trip actuator 17 (FIG. 2). ). The illustrated circuit breaker 3 has three pole units which are formed side by side in a housing and are arranged in a separator separated by a dielectric barrier formed with each other integrally with the base 9 and the cover 11. The actuator 13 is arranged within the central pole diaphragm and is common to all three pole units.

Each pole unit is pivotally connected to a fixed main contact 21 placed on a fixed terminal conductor 23 and to a terminal conductor 24 fixed at 35, and to move simultaneously with each other. It includes a movable contact device 31 which is connected to the rod 37, which interconnects the movable contact device 31, and fluidly connects all the contact devices so that they can be moved to the operating mechanism (13).

The movable contact device 31 of each pole unit is a set of elongated contact members 29, 47, 49 arranged side by side with a contact tray 33 having a generally U-shaped cross section rotatably connected at 35 in the terminal conductor 24. Each contact member is rotatably connected to one end of the terminal conductor 24 (e.g., hinged). The contact member has a longitudinal slot as shown at 56, through which the pin 55, which is supported on the side flange of the contact receiving 33, extends. The elongated contact members 29, 47, 49 are fixed with a plurality of main contacts 29 each having a contact surface or button 27 facing the fixed main contact 21 on the terminal conductor 23. It consists of a pair of arc contacts 47 and 49 having an arc contact surface or button 51 facing the fixed arc contact 53 on the terminal conductor 23 and extending over the main contact 29. As known in the art, a yak is supported by an insulating frame or housing 41 and a frame 41, usually composed of a layer 43 of spaced magnetized plates with a V-shaped yak receiving slot 45. A device or arc chute 39 is at the contact of each pole unit.

At least one or more of the two arc contacts 47 and 49 are spaced apart by a better main contact between them, and these arc contacts have yak horns 57 and 59, respectively, The horn usually extends into a space defined by a V-shaped slot 45 and is bent to gather at one point so that the angle between the two arc horns is approximately equal to the angle made by the two slots 45. In the vicinity of the arc horn between the arc contacts 47 and 49, a separating device 61 may be provided to prevent the arc horns from coming into contact with each other on the string.

When the actuating mechanism 13 is in contact opening operation, the main contact surfaces 21 and 27 become arc contact surfaces 51 by the initial operation from the position where each contact device 31 is closed in the contact shown in FIG. ), Before (53), all currents are quickly transferred to the arc contacts 47, 49.

As soon as the arc contact surfaces 51 and 53 are separated, an electric arc flows between them, but because the arc arcs 57 and 59 are parallel and associated, the arc arc strut 39 is associated. Is quickly delivered and turned off.

Claims (1)

A movable contact device which moves in a closed position and an open position with respect to a fixed contact, and an arc chute for storing and extinguishing the electrical arc generated when the movable contact device moves from the closed position. A circuit breaker having at least one pole unit comprising: a set of elongated contacts supported side by side to move simultaneously with each other, wherein two of the elongated contacts are the main contact 29; Arc contacts 47, 49 that are closed before and close to the contacts, wherein the arc contacts 47, 49 are laterally spaced such that at least one of the main contacts 29 is disposed between the arc contacts, It is characterized by having arc horns 57 and 59 extending to the arc shout 39 and bent at one point to each other. Is the double arc contact of the circuit breaker.