SU1111210A1 - Vacuum switch - Google Patents

Abstract

VACUUM SWITCH containing arcing chamber with movable and fixed arcing contacts, induction dynamic drive with induction coils with a metallic movable diaphragm fixed between them, rigidly connected with a movable contact, characterized in that it is designed to work. reliability and efficiency, as well as improved serviceability, the drive is provided with an insulator mounted on a vacuum interrupter chamber with two end cavities interconnecting with each other, with the specified mobile diaphragm installed in the upper cavity, the specified induction coils are installed in the lower cavity placed between them by the additionally introduced second movable diaphragm, (A and the space of the mezvuda with both mobile diaphragms filled with insulating liquid.

Description

The invention relates to electrical engineering, specifically to vacuum

switch m

Known, the switch containing the subwick and fixed contacts, the drive of the induction-dynamic type 1.

The switch has increased dimensions and a short service life due to the forced increase in the size of the solid insulator connecting the movable contact with the drive and the failure of this insulator due to the influence of the impulse load on it. In addition, the drive control circuit of the switch is under high potential, which complicates its maintenance, and high-voltage transformers are needed to power the circuit, which increases the cost of the switch.

The closest to the invention to the technical essence and the achieved result is a vacuum switch containing a vacuum arc chamber with moving and fixed arc contacts, an induction dynamic drive with an inductor; 11 ionic coils

placed between a metal movable diaphragm rigidly connected to the movable contact 2

A disadvantage of this device is that the drive is at a high potential.

The purpose of the invention is to increase the reliability, cost effectiveness and improve the serviceability of the switch.

The goal is achieved by the fact that in a vacuum switch containing an arcing chamber with a moving and fixed arcing contacts, an dynamic-induction actuator with induction coils with a metal movable diaphragm fixed between them, rigidly connected to the movable contact, the actuator is equipped with an insulator fixed to the vacuum arcing a chamber with two end cavities communicating with each other, with the indicated mobile diaphragm installed in the upper cavity, and c. induction coils with an additionally inserted second moving diaphragm placed between them are installed, and the space

between the two movable diaphragms filled with insulating liquid.

The drawing shows schematically the proposed switch, transverse

incision.

The device contains a vacuum chamber. with fixed and movable contacts fixed to contact holders 2 and 3, insulator 4, fixedly mounted in the lining part of the vacuum chamber 1. In the inner cavities of insulator 4, metal moving elements 5 and 6 are tightly fixed, and both inner cavities of the isolator are connected kangp 7. The gap between the moving elements 5 and 6 is filled with a dielectric fluid, such as distilled water or transformer

oil In the lower cavity of the insulator 4, coils 8 of an induction-dynamic drive are installed above the membrane 5 and coil 9 under the membrane. The upper membrane 5 is mechanically connected to the contact holder 3 of the movable contact.

The device works in the following way.

To turn on the switch, it is necessary to apply a current pulse from a capacitor or other source to terminals a, b of the switching coil 9. The current flowing through the coil 9 interacts with currents induced by

in mobile element 6, which pushes away, compresses the dielectric fluid that rushes through the channel into the cavity under the movable element 5. The latter moves,

movable elements are in the upper position, the switch is on. Dp off the switch, a current pulse is applied to the trip coil 8 of the drive, resulting in

the movable element 6, repelling itself abruptly, goes to the lowest position, carries along a dielectric fluid flowing through the channel 7 from the cavity under the movable

element 5. As a result of this

the movable element 5 moves to the lowest position, is carried along by a moving contact, the switch is turned off.

The use of a special form insulator with hermetically movable elements mounted into it, under which the cavities are filled

the dielectric fluid allows the vacuum chamber 1 to be isolated from the drive and control circuits, which can be located at ground potential.

Thanks to this, the reliability of the switch is improved, its cost decreases, since it does not

special isolating transformers are required, special devices for transmitting the control signal from the ground to a high potential circuit, monitoring the condition of the elements and their maintenance are simplified, and the size of the switch is reduced.

Claims (1)

VACUUM · CIRCUIT BREAKER, comprising an arcing chamber with movable and fixed arcing contacts, an induction-dynamic drive with induction coils with a metal movable diaphragm between them, rigidly connected to the movable contact, characterized in that, in order to increase reliability and economy, as well as improve convenience maintenance, the specified drive is equipped with an insulator mounted on a vacuum arcing chamber with two end cavities communicating with each other, and in rhney cavity set said movable aperture, mounted in the lower cavity with said induction coils disposed meschtsu them additionally introduced second movable diaphragm, and the space between the two movable diaphragms is filled with an insulating liquid. 111 1210