SU838798A2 - Switching device for switching-off power dc and ac circuits - Google Patents

Description

(54) SWITCHING DEVICE TO DISCONNECT THE POWER CIRCUITS OF PERMANENT AND ALTERNATING CURRENTS

one

The invention relates to contactors or switches, in particular to devices for quenching or preventing an arc between current-carrying elements.

According to the main author. St. No. 416775, there is a device for disconnecting power circuits of constant and alternating currents, containing a contact system consisting of main and auxiliary contacts, and a resistance in the form of a spring of high quality material connected in parallel to the main pair of contacts and in series with the contacts of an additional pair, in which on the main stationary contact, the active resistance is isolated fortified, one output of which is connected to the main stationary contact and the other to a curved spring-loaded plate tional fixed contact, which is fixed on the isolation plate of the main fixed contact and the convex side in contact with the active resistance, wherein the additional movable contact springs fixed to the conductive plate main movable contact 1.

This device provides an arc-free shutdown of power circuits if the current through an additional pair of contacts at the moments of their opening does not exceed some relatively small value determined by the arc ignition threshold current, which limits the range of currents switched by the main pair of contacts without initiating an arc between the contacts of the additional pair and reduces breaking capacity of the device.

The purpose of the invention is to increase the breaking capacity of the switching device.

The goal is achieved in that the switching device is equipped with a variable volume chamber with an aqueous electrolyte solution, an expansion tank and a drain, while an additional pair of contacts is placed in a variable volume chamber, which is connected to the expansion tank and drain.

The invention is illustrated in the drawing.

Claims (2)

The switching device contains a main pair of contacts 1 and 2 placed on spring plates 3 and 4, and an additional pair of contacts 5 and 6, of which contact 6 is placed on plate 4, and contact 5 is placed on a curved elastic nlastip 7, reinforced through an insulating sleeve 8 on plate 3, as well as a high-resistance variable active resistance 9, mounted on plate 3 through insulator 10 and connected in parallel with the main slot of contacts 1 and 2 and in series with contacts 5 and 6 of an additional pair. The curved plate 7 faces a convex storor to the stripped winding section of the active resistance 9. An additional pair of contacts 5 and 6 is insulated through insulating sleeves 11 and 12 of non-wetting material (organic) into a cylindrical variable-volume corrugated chamber 13 with an electrolyte water solution 14. Chamber 13 is connected to the expansion tank 15 and the drain 16. The expansion tank 15 serves to drain air and part of the electrolyte solution 14 when the chamber 13 is compressed, and also to inject solution 1.1 of the electrolyte 14 into chamber 13. Drain 16 serves to drain the spent electrolyte solution 14. When the actuator is turned on, contacts 2 and 6 on spring plate 4 begin to move. At the same time, the corrugated chamber 13 is compressed first, an additional pair of contacts 5 and 6 is shunted by electrolyte solution 14, closed, and the plate is bent / begins to press to the stripped active resistance winding section 9, gradually reducing its resistance. At the moment when the active resistance 9 is fully deduced, the main pair of contacts I and 2. When turned off, the opening occurs in reverse order. During the shutdown period between the main pair of contacts I and 2, the arc does not occur, because at this moment the load circuit is closed through contacts 5 and 6 of the additional pair. The elimination of the arc when an additional pair of contacts 5 and 6 is opened is caused by their shunting with electrolyte solution 14. Since contacts 5 and 6 of an additional pair are moistened with electrolyte solution 14, a circuit break occurs on the surface of electrolyte 14, but does not occur. that the electrolyte solution 14 has a weak electronic conductivity and cannot provide my need to excite the arc discharge of the field current density from its surface. For the same reason, when turned on, the arc of an arc is removed. The invention The switching device for disconnecting the power circuits of constant and alternating currents by aut. St. L 416775, characterized in that, in order to increase the disconnecting capacity of the device, it is equipped with an irregular volume chamber with an aqueous electrolyte solution, an expansion tank and a drain, while an additional pair of contacts is placed in a variable volume chamber connected to the expansion tank and drain . Sources of information taken into account in the examination of the USSR Copyright Certificate jYo 416775, cl. H 01 H 9/30, 1972. /;