SU851531A1 - Gas switch arc-extinguishing device - Google Patents

Description

(54) GAS DRAGGING DEVICE The invention relates to high-voltage apparatus engineering and can be applied to high-voltage switches. Arc-suppressing devices are known in which the arc extinguishes with as it rotates in the magnetic field of permanent magnets embedded in the body of contacts 1. However, the intensity of the magnetic blow in such devices is insufficient, since the dimensions of the magnets depend on the size of the contacts in which they are embedded. The arc-suppressing devices are known, containing the main contacts, a chamber filled with SF6 gas, divided by a transverse partition on the cavity, arc-contact contacts located in the chamber, auxiliary contacts and devices for main and gas blowing. The magnetic blowing device is made in the form of a coil, which is connected to the circuit only when the smooth contacts are opened, when the arcing contacts are still closed. while maintaining excess pressure of the gas in the chamber. Under the action of this pressure, the flow of the gas rushes to the arcing contacts and extinguishes the arc formed on them {2. The disadvantage of this design is its complexity. A common drawback of both types of structures is that, when extinguishing, only one arc extinguishing factor, either magnetic or gas blast, acts on the arc. The purpose of the invention is to increase the breaking capacity of the arc-limiting device and simplify the design. This goal is achieved by the fact that the movable and fixed contacts in the open-ended position are placed in different cavities of the chamber, divided by a transverse electrically insulating partition with a coaxial gap. The fixed contact is produced in the form of a flat round plate, the diameter of which is equal to the internal diameter of the annular gap, and placed parallel to the partition in the body of the partition on both sides of the annular

Permanent magnets, oriented by opposite poles in the direction of this gap, are installed in the gap, and the movable contact is installed with the possibility of entering through the annular rupture into a stationary contact, equipped with lamellae. The cavity in which the fixed contact is placed is provided with an element of variable volume, for example a bellows or a spring-loaded piston. .

The chamber can be equipped with one or more additional partitions, similar to the first one and installed parallel to it with gaps between them filled with an arc-suppressing medium.

Figure 1 shows the proposed arc suppression device in the on position; figure 2 - section aa in figure 1.

Movable and fixed contacts 2 and 3 are located in an arc-suppressing chamber 1 filled with an arc-suppressing medium, for example an SF6 gas. In the disconnected position, the contacts are located in opposite cavities of the chamber divided by transverse electrically insulating partition 4 with an annular gap 5.

The fixed contact 3 is made in the form of a flat round plate, the diameter of which is equal to the inner diameter of the annular gap. Plitasnabzhena lamellas 6 and fixed parallel to the partition 4 on the holder 7.

In the switched on position, the contact 2 passes through the annular gap 5. The partition is equipped with a magnetic magnetic device, made in the form of permanent magnets 8, placed circumferentially in the partition on either side of the annular gap 5, so that with their opposite poles they are oriented towards the annular clearance.

The cavity of the chamber with a fixed contact placed in it is provided with an element 9 for increasing the volume in the process of opening the contacts, made in the form of a bellows.

The device works as follows.

When contacts 2 and 3 open between them, an arc arises and the pressure in the cavity, in the direction of which the moving contact moves, increases. This increased pressure is transmitted to the opposite cavity of the chamber, which is equipped with a bellows for increasing its volume. °

In this case, a directed gas blast arises in the annular gap, blowing an arc. In addition, the arc is under the influence of magnetic

blow due to its interaction with the transverse, with respect to the gap, the magnetic field of the permanent magnets 8. The direction of the magnetic blow along the annular gap.

Thus, in the proposed construction, the arc is under the impact of both magnetic and gas blowing.

The use of the proposed device makes it possible to increase the breaking capacity of a high-voltage breaker with a relatively simple design of an arcing device.

Claims (2)

1. Gas switch arcing device containing chamber, filled with an arc-suppressing medium, such as an SF6 gas, movable and fixed arcing contacts, located in it, a partition with an annular gap separating the chamber by Two cavities and magnetic elements, characterized in that, in order to increase the breaking capacity and simplify the design, the moving and stationary arcing contacts in the disconnected position are located in different cavities of the chamber, the fixed contact is made in the form of a flat circular plate, the diameter of which is equal to the inner diameter annular gap, and placed parallel to the partition, which is made of electrically insulating material, in the body of which permanent magnets are mounted on both sides of the annular gap oriented opposite poles in the direction of this gap, and the movable contact is installed with the possibility of entering through the annular gap into the fixed contact, provided with lamellas, the cavity in which there is a fixed contact, provided with an element for increasing the volume, for example a bellows or a spring-loaded piston. 2. The device according to claim 1, characterized in that, in order to increase the intensity of the magnetic blow, the chamber is equipped with at least one additional partition, which is installed parallel to the first with a gap between them, filled arc suppression medium. Sources of information taken into account in the examination 1. USSR author's certificate 189061, cl. H 01 H 33/24, 1967.  2. USSR author's certificate No. 594281, cl. H 01 H 33/70, 1973.