SU886086A1 - High-voltage switching apparatus - Google Patents

Description

(54) HIGH-VOLTAGE SWITCHING MACHINE

I

This invention relates to an electrical apparatus structure, specifically to arc-arc devices and high-current switching devices.

Commuting apparatus with extinguishing devices are known, which contain a chamber with metal plates, in the gap between which an electric arc is inserted, using a magnetic field (1).

The disadvantage of such devices is the need for a device that creates a magnetic field. In addition, the arc causes erosion of the plates, which reduces the service life of the device.

Closest to the present invention is a high-voltage switching aimapaT containing stationary contacts and spring-loaded in the form of an arc-suppressing chamber partially filled with liquid metal paste into which stationary electrodes are inserted with steps from the chamber inside which are mounted with the possibility of translational rt movement rigidly fastened together. electrodes.

In the on state, the movable electrodes are immersed in the liquid-metal paste, and when disconnected, they also leave: 3 pastes (2.

A disadvantage of the known apparatus is that the electrodes, being filled in the form of plates in the process of exiting the paste, are in contact with it until the plastid ends are located beyond the level of the paste,. taking place before shutdown. The consequence is a slow shutdown process.

and, moreover, there is a likelihood of the evaporation of the paste film, which is under the current of the plate, before the plate comes out of contact with the paste. Then at the points of separation of electrodes.

Claims (1)

IS is one of the reference points of which is on the electrode, and the other is on the paste. Although such arcs burning on both sides of the electrodes soon merge into one arc located in the gap between the parts of the paste and do not appear 20 seconds, yet this phenomenon is desirable because it erodes electrodes that do not recover. and, therefore, reduces the life and reliability of the device. 3 The purpose of the invention is to reduce the shutdown time and increase the reliability of the robot. The goal is achieved by the fact that in a high-voltage switching device containing fixed contacts and a spring-loaded contact bridge made in the form of an arcing chamber, partially soldered liquid metal paste, into which the fixed electrodes from the output NM from the chamber, inside which are mounted with the possibility of translational movement, are immersed between each other, parallel electrodes, specified parallel electrodes made in the form of triangular prisms, the edges to tory facing the bottom of the arc chamber. On the fit. 1 shows the proposed apparatus in the on state; in fig. 2 - the same, in the off state. t Contacts 1 are closed by electrodes 2, stationary relative to the arcing chamber 3, which is able to move by springs 4. In the chamber 3 liquid metal fins 5 are placed, consisting of, for example, a mixture of a gallium-indium-tin eutectic alloy displaced with carbon black powder or graphite . The chamber contains translationally moving electrodes 6, having the form of triangular prisms facing one of their ribs toward the paste 5, fastened together by a strap 7 connected to the rod. In the switched on and off state, chamber 3 holds the springs 4. In the switched on state, contacts 1 closed through the electrodes 2, the paste 5 and the electrodes 6, immersed in the paste 5. When you turn off the rod 8 tons of chuck up. In this case, the electrodes 6 come out of the paste 5. As a result of the pointed form, the electrodes 6, when we lift, do not slide the side walls along the paste, as is the case with the known apparatus, because of the parallelity of the side walls, but disconnect from it. speeds up the shutdown process. After the electrodes 6 are disconnected from the step 5, the recesses in the form of channels with inclined walls remain in the place where they were before the disconnection. This is due to the property of the paste to retain its shape after the action of the deforming bridges on it. Between the inclined walls of the channels in the paste 5 there is a layer of paste, due to which the circuit to be switched is not broken immediately, but only after these sections have burned. Arcs appear at the site of burned out areas. In addition, the walls of the pasta channels play the same role as the surface of the plates in the arc chute of lime arc chutes. By the time of approach of plank 7 to the ceiling, amers 3 arc extinguished. In the process of further movement, the bar 7 presses the ceiling of the chamber 3, lifting it and compressing the spring 4, which has passed the most compressed position, send the body upward, disconnecting it from the current-carrying contacts 1. After that, the collapse of the channel walls from the paste 5 does not result in is a circuit closure. Due to the presence of springs 4, chamber 3 makes some oscillations, however, such oscillations cannot lead to a re-closure of the circuit, as this is prevented by the plate 7, abutting against the sweat of chamber 3, if it moves a considerable distance in the direction of the tires1. The oscillatory movements of chamber 3 and striking it on the bar 7 promotes shaking of the paste 5 and restoring the internal circuit of the chamber 3. It is turned on by pressing the rod 8. In this case, the electrodes 6 deepen into the paste 5 and, pressing on the chamber 3, move it into direction of the spring 1, compressing the spring 4, which passed the highest degree of compression, send the chamber to the shiam 1 before contact of the electrodes 2 with the contacts 1. Contact of the electrodes 2 with the contacts 1 occurs in the form of an impact, while paste 5 is re-injected, which contributes to its best lay down the electrodes 6 and filling cavities, if any, existed previously. The advantage is in the lower inertia of the shutdown process and in its increased reliability achieved by the lower probability of arcs burning on the electrodes 6, and also in the fact that the slopes of the channels in the paste have inclined walls and, therefore, are more resistant to collapsing, which also increases the reliability of the device. The invention The high-voltage switching device containing fixed contacts and a spring-loaded contact bridge, made in the form of an arcing chamber, partially filled with liquid metal paste, into which the fixed electrodes with reed electrodes from the chamber, inside which parallel-mounted electrodes are installed with the possibility of translational movement, characterized in that, in order to reduce the turn-off time and improve reliability, said parallel of electrodes are arranged in the form of triangular prisms, whose edges facing the bottom of the arc chute. Information sources,, taken into account in the examination 8860864 ; 1. USSR author's certificate If 167228, cl. In 66 C 1/66, 1966. 2, USSR Author's Certificate N 680076, cl. H 01 H 29/00., 1977 (prototype). g 5  . X Xg G.- /. . -. ; l / .; :; / / ... Oj / ,   yuo about skzhg $ zhddd xx I / (