SU1552248A1 - High-voltage air switch for electrothermal units - Google Patents

Abstract

The invention relates to electrical engineering, in particular to switching devices. The purpose of the invention is to increase the mechanical resource due to the introduction of an elastic insulating cuff into the design. When the switch is turned on, the elastic cuff 16 prevents air from leaving the zone and through the gaps between the contact nozzle 5 and the upper current-carrying terminal 8, thereby damping the impact of the moving contact 5 against the fixed contact 4, which significantly increases the reliability of the contact system. 1 il.

Description

The invention relates to electrical engineering, namely to high voltage; air circuit breakers for electrical thermal installations with frequent switching operations.

The aim of the invention is to increase the mechanical resource and term

I service breakers.

The drawing shows the pole of the high-voltage switch for electrothermal installations.

Each pole of the circuit breaker contains an arc chamber and a chamber 1 ,. mounted on insulator 2, located 15 on the tank 3, common to all three poles. In the extinguishing chamber 1, a fixed contact 4, is installed. movable contact nozzle 5, fixed nozzle 6, lower current-carrying outlet 20 leads 7, upper current-conducting terminal 8 s: current-collecting sliding Ζ-shaped contacts 9, arcing catcher: 10, contact, spring 11, silencer

12, the piston 13, the guide 14, 25 of the sleeve 15, an elastic cuff 16 ', the annular base of which with the help of a lining is fixed to the current-carrying terminal 8 in contact with the movable contact nozzle 5, and the central 30 protruding above the annular base has a side facing the spring-loaded piston 13 has a tapered outer surface and a tapered bore inside for the passage of the movable contact nozzle 5. The cuff can be installed with some interference with respect to the contact nozzle 5 or with a small gap, which allows you to adjust braking force of the buffer. A blow valve 17 is located in the reservoir 3. The switch comprises a pneumatic device 13.

tact-nozzle 5 and the upper current-carrying terminal 8 at the installation location of the sliding contacts. 9, squeezes the conical g part of the sleeve 16 from the contact nozzle 5, fills the space a under the piston 13 and together moves the piston 13, the contact nozzle 5 and the sleeve 15 to its highest position, compressing

IQ spring 11.

An electric arc arising between the disconnected contacts 4 and 5 is transferred under the action of compressed air from the movable contact nozzle (5 5 to the arrester 10 and is extinguished.

The sleeve 15 protects the contact spring 11 from burning.

After the shutdown process is completed, the cut-off valve, blast is activated; the double valve 17 closes, stopping the supply of compressed air from the tank 3 to the arcing chamber 1. Compressed air flows from the arcing chamber 1, except for space a, through muffler 12.

The air exit from the space a through the gaps of the housing by the contact nozzle 5 and the upper current-carrying terminal 8 is prevented by the cuff 16, the upper end of the 3Q part of which is tightly pressed against the contact nozzle 5 by compressed air located in the space a.

When the switch is turned on in connection with the release of compressed air from the arc jg of the quenching chamber 1, the piston 13, the sleeve 15 and the movable contact nozzle 5 under the action of the spring 11 begin to move down. In this case, further compression of the air located in the space a occurs, which additionally creates a braking effect + effect on the piston 13, which moves the movable contact nozzle 5 by

When the switch is on, the current loop of the extinguishing cadd of measure 1 consists of an upper current-carrying terminal 8, sliding Z-shaped contacts 9, a movable contact nozzle 5, a fixed contact 4., and a lower current-carrying terminal 7.

The switch operates as follows.

When the current switch turns off the pneumatic device 18 discharges air from under the blower piston _{from the} valve 17, the latter opens and compressed air is supplied from the tank 3 to the arcing chamber 1, which passes through the gaps between the switching on.

The release of compressed air from the space a at the stage of movement of the movable contact nozzle 5 for switching on is carried out only through leaks between the cylindrical surface of the piston 13 and the guide 14, between the end surfaces of the piston 13 and the sleeve 15, and also between the end surfaces of the sleeve 15 and the contact nozzle 5.

The lower the piston 13 drops, the greater the pressure in space a and the greater the braking force of the buffer, which can significantly reduce the speed of the movable contact5 of the nozzle 5 and, as a result, reduce its impact on the stationary contact 4.

Claims (1)

Claim A high-voltage air circuit breaker for electrothermal installations, in each arcing chamber of which there is a spring-loaded piston and a fixed contact and a movable contact nozzle mounted on the same axis, electrically connected to current-carrying leads, characterized in that, in order to increase the mechanical resource, inside the arcing chamber an additionally introduced elastic cuff, the annular base of which with the help of a lining is fixed to a current-carrying terminal in contact with a movable contact act-nozzle, and the central part protruding above the annular base has a conical outer surface facing the spring-loaded piston AND a conical hole inside for the passage of the movable contact nozzle.