SU483839A3 - Gas type electrical switch - Google Patents

Description

The element is made in the form of a pipe 6 and is provided with spring-loaded plates 7, the springs of which press said plates with a certain contact pressure to the fixed contact elements along the contact surfaces 8. The movable contact element contains a sliding ring contact 9 of an arc-resistant material and is provided with an insulating ring 10, in which is fixed the sliding contact 9.

The tube 6 is screwed into the transition element 11, rigidly connected with screws 12 to the tube 5, which is a cylinder of a piston blowing device.

The piston blower cylinder ends with a nozzle-shaped element 13, which surrounds the fixed contact element 3. In the process of shutdown, the pipe 5 moves together with the movable contact element 6 relative to the fixed piston 14, resulting in accumulation of damping means. The transition element 11 is pivotally connected to the rods 15 by means of pins 16. With the rods 15 mechanically connected is the actuator element of the switch (not shown). Arcing chamber 1 is filled with sulfur hexafluoride under pressure.

The switch works as follows.

In the process of deactivation, the movable elements of the switch move downwards. At the same time, the sulfur fluoride fluoride inside the pipe is compressed and accumulates pressure in the piston cavity. When pipe 5 passes approximately half of its stroke and the movable contact element slides off the stationary contact element 3, i.e., when the galvanic opening of the circuit occurs, the annular gap formed between the opened contact elements will be compressed until the sulfur fluoride is tested, which will provide two-sided blowing through the nozzle contact elements 3 and 4. In this case, the electric arc passes to contact 9 of arc-resistant material and then is quenched with sulfur hexafluoride streams.

FIG. 2 shows the first disconnection stage when the fixed contact elements 3, 4 are connected by a galvanically movable contact element. In this case, the contact plates 7, under the action of the spring plates 17, rest with their contact surfaces on the external surface of the fixed contact element 3. The current flows along the line indicated by a dotted line in the drawing.

FIG. 3 shows the next disconnection stage, which differs from the first in that the contact springs rest with their contact surfaces already on the edge of the fixed contact element 3 and with their projections 18 rest on the ledges 19, which are made in the sliding ring arcing contact 9. Line of current flow is changing.

FIG. 4 shows the next shutdown stage in which the current flows only through the 5th circular arcing contact 9 and the dynamic forces cease to undesirably influence the contact system.

FIG. Figure 5 shows the shutdown stage when an electric arc 20 was first formed. The insulating ring 10 prevents the arc from moving to a metal pipe 6.

FIG. b the shutdown stage is shown when the electric arc switches from the arcing contact 9 to the stationary

15 pin element 4.

FIG. 7, the arc burns only between the fixed contact elements 3, 4. This is the last stage of the shutdown, after which the arc is pulled and pulled under the action of a gas flow in the nozzles of the contact elements.

FIG. 8 shows a variant of the device in which the insulating ring 10 is made in the form of a nonslung body, which projects beyond the arcing contact 9 and surrounds the fixed contact element with a slight gap. As a result of this arrangement, when small currents are disconnected, only a small gas flow is created or only after disconnecting the arcing contact 9 with the contact element 3, and only when the slider body releases the gas flow, the electric arc blowing begins. As a result, the risk of tripping to zero current is eliminated, and thus overvoltage is prevented.

FIG. 9 shows a variant in which the slider body is provided with a conical nozzle 21, which contributes to the appearance of an additional gas flow, which improves arc flow.

With the same purpose, the nozzle-shaped contacts of the contact elements 3 and 4 are made with different diameters.

Subject invention

Claims (4)

1. An electric gas type switch containing a piston blower device, fixed contact elements, 0 equipped with nozzle-shaped contacts, and a movable contact element made in the form of spring-loaded contact plates enclosed in a pipe and an annular sliding contact of arc-resistant material, characterized in that, in order to increase reliability and increase service life, the movable contact element is provided with insulating a ring in which a ring-shaped sliding contact is fixed, made 0 with a step on which the contact plates rest in the switching process. 2. An electric switch according to claim 1, characterized in that the insulating ring is designed as a slider body, covering fixed contact elements at extreme switch positions. 3. Electric switch but n. Clauses 1 and 2, characterized in that the slider body is provided with a conical seat. 4. Electric switch but n. n 1, 2 and 3, characterized in that the nozzle-shaped contacts of the fixed contact elements are made with openings of different diameters. Fig / J FIG. 6 FIG. 7