SU467421A1 - Mobile switching system - Google Patents

Description

one

The invention relates to low-voltage electrical apparatus and can be used in electrical circuits for controlling electrical drives and for disconnecting short-circuit currents.

Movable switching apparatus systems are known, for example, a circuit breaker containing a drive, a movable insulating contact holder, in a window of which a contact bridge is fixed between two springs.

In order to catch the speed when switching off the movable INSULATING CONTACT HOLDER in the proposed system, a U-shaped bracket made of a ferromagnetic material is mounted on each pole, grasping the contact bridge with a spring pressed. In the contact holder window there are ferromagnetic measles with a pusher acting on the contact bridge when the core is attracted to the U-shaped bracket, and a spring pressing the bark to the pusher.

The U-shaped ferromagnetic bracket can be worn on the specified U-shaped bracket, with the jumpers of both brackets arranged in parallel planes mutually perpendicular to each other.

The drawing schematically shows the described mobile system in the disconnected position of the switching apparatus.

The actuator 1 acts on the contact holder 2, in the window a of which the movable steel bore 3 is mounted, supported by the spring 4, and the pusher b, passing

through the hole, b and resting one end at measles, and the other at the contact bridge 6, installed in a window in, formed by a steel U-shaped bracket 7, fixed on the contact holder. A spring 8 is also installed in the window in between the back of the bracket 7 and the bridge 6. A bracket 9 is attached to the bracket 7. In addition, the system contains fixed contacts 10 and arcing chambers 11, installed each in the arcing area, as well as maximum current protection (in the drawing not shown).

When turning on the moving system of the switching device, the drive 1 t does not have contact holder 2 down. During the movement of the contact holder, the contacts of the bridge 6 are in contact with the fixed contacts 10, the spring 8 is compressed, the necessary contact failure is made, and the spring 4 is expanded and the pin 3 with the pusher 5 rises by the amount of failure of the contact bridge 6. In the on position between the bore 3 and the poles figurative bracket 7 remains a guaranteed clearance. The same gap is formed between bridge b and bracket 9.

When the mobile system of the switching device is disconnected, a magnetic flux arises as a result of the short-circuit current, which passes through the contact bridge 6. This magnetic flux is closed with a staple 7 and a corona 3 through the air gap. The electromagnetic current created with it, attracts measles 3, which by the pusher 5 raises the bridge 6, the input of the electric arc by the moving and fixed contacts, which limits the short circuit current. Even before the full extinction of the arc, the actuator 1 under the influence of the overcurrent protection moves the contact holder 2 up to the off position, the arc goes out, and bridge 6 and the whole system occupies the initial position.

Subject invention

Claims (2)

1. A mobile switching device, such as a circuit breaker, comprising an actuator, a contact bridge fixed between two springs on a movable insulating contact holder made with a window, characterized in that, in order to improve speed when disconnected, at each pole of the movable insulating the contact holder is fitted with a U-shaped bracket made of a ferromagnetic material. the grip contact bridge with a spring is pressed, and in the window of the contact holder there are ferromagnetic measles with the lateral acting on the contact bridge when the core is attracted to the U-shaped bracket, and the spring that presses measles to the pusher. 2. The system of claim 1, wherein a U-shaped ferromagnetic bracket is attached to said U-shaped bracket, the bridges of both brackets being located in parallel planes are mutually perpendicular to each other. eleven