SU696553A1 - Liquid switch arc-extinguishing device - Google Patents

Description

I

The invention relates to the field of high-voltage apparatus for the design of arcing devices of liquid switches, mainly low-oil ones.

Arc suppressors of main oil circuit breakers are known, which contain a hollow porcelain insulator, an expander, an insulating body with an arcing chamber, a fixed and movable contact and an oil-filled reservoir into which a moving contact moves when disconnected and which communicates with the expander via an annular volume formed by porcelain insulator and insulating enclosure ij.

Such devices do not provide reliable quenching of small inductive or capacitive currents, since the low energy of the arc is due to the auto-blown not sufficiently efficiently. Due to the fact that the filling of the arc chamber with oil occurs only through the exhaust channels

In the case of a back pressure inside the chamber, when the chamber is turned off, the filling of the chamber with oil sharply deteriorates, which leads to cavitation, a decrease in the insulating strength of the intercontact gap and the possibility of re-ignition of the arc, especially when small capacitive currents are disconnected.

These shortcomings are eliminated:. in the arcing devices of the liquid switches, in which when a small current is disconnected, a forced supply of fluid to the arc suppressor chamber (pulsed blowing) is made.

The closest technical solution is an arcing device of a low-oil high-voltage switch. a yarn, a hollow porcelain insulator, an expander, an insulating body with an arcing chamber, fixed and moving contacts and an oil-filled tank in which the moving contact moves when disconnected, while the tank communicates not only With the expander, but in the upper part of the arcing chambers 2, the joint is carried out through an annular volume formed by a porcelain insulator and an insulator with a casing, connecting channels made in the casing of a fixed contact, and mechanically connected to apana mounted in the housing nedodvnzh Nogo contact and guides effected in dependence on the pressure ratios in Dugo quenching chamber and the reservoir, the reservoir connection with any expander or the upper part of the arc chute. When shutting down small currents, this allows supplying fresh oil, displaced by a moving contact from the reservoir, to the upper part of the arcing chamber, creating a longitudinal pulsed blow, and when disconnecting large currents, protecting the reservoir from significant pressure directs the displaced oil to the expander. The disadvantage of this device is that the forced supply of oil is carried out through a fixed contact to the upper part of the arc-suppressing chamber and the pulsed blow affects respectively only the upper part of the electric arc. This deficiency manifests itself in the widely used transverse and head-on-cross section blowing chambers, which are characterized, as a rule, by the presence of several blowing channels connecting the under-chamber space with the expander and allowing shutting off of large capacities where valves are installed. According to this patent, pulsed blasting is provided only in the first working channel of the chamber, without affecting the rest of the arc of God gap. In addition, the limited cross-section of the valve channel and connecting channels of complex configuration, performed in the fixed contact housing, also reduces the effectiveness of the impulse-blowing due to the high hydrodynamic resistance. The aim of the invention is to increase the efficiency of low current quenching. This is achieved by the fact that in a known liquid extinguishing device. a switch containing an expander, a hollow porcelain iso tbr, inside of which is an insulating housing with an arcing chamber, fixed and movable contacts, a fluid filled reservoir into which the moving contact is switched off and a system of mechanically connected valves for pulsed blowing, The indicated valve systems are spreaded from at least two mechanically connected valves: normally closed, connecting the reservoir with an annular volume formed by a porcelain insulator an insulating housing and a normal open towards podkamernogo space connecting the reservoir with this space. Normally open valve can be made in the form of a spring-loaded ring, covering the movable contact. In addition, in order to ensure self-repairability, the mechanical coupling of the valves is made in the form of an elastic connection, for example, in the form of a spring-loaded rod. The presence of a normally open valve between the tank and the under-chamber space and a normally closed valve between the tank and the annular volume connected to the expander provide effective damping of small currents by supplying all the fluid displaced by the movable contact from the tank directly into the under-chamber space, which creates an overpressure in the blown camera channels even before the moment of contact divergence and to organize an intense pulsed blast over the entire arc gap. At the same time, in the mode of disconnection of large currents, i.e. with a large back pressure in the under chamber space, due to the mechanical connection between these valves, the arresting device normally works by closing the normally open valve and simultaneously opening the normally closed valve, resulting in the high pressure region of the under chamber space separating from the reservoir and the liquid being expelled is directed through the annular volume into the expander, thereby excluding the deceleration of the moving contact. The implementation of a normally open valve in the form of a spring-loaded ring that covers the movable contact provides a sufficiently large cross-section of the valve, which, due to the low hydraulic resistance, contributes to an increase in the efficiency of the pulsed blow. FIG. 1 and 2 schematically and illustrated the proposed device, respectively, in the mode of isolation and low currents and in

In the large current tokap off mode, cs fig 3 is the node in fig. 1, an example of a mechanical connection of a clapop with a spring rod. . The arc suppression device consists of a housing 1, an extra strong insulating cylinder, reinforced from the ends of the metapysical 1 terminal 2 and -3, inside which is a decomposition chamber 4, an arc-contact contact 5j, it is not attached to the rotated frame) contact 6 and the unpowered tact of 7j headlights (|) the Oak tire 8, the fuse case 1 from external influences, spreading the IR 9, closed the arc extinguishing device svryr, II tank 10 in the form of the reference switch in which the prp off moves under Dry contact 5 The damping chamber 4 has a central opening 11 for the passage of up to five contact 5 and transverse. There are blowing ducts 12, connecting the subchamber space 13 from the bottom of the circuit 9. The lower flange 3 is equipped with a valve 14 and 15, mechatrical connected to each other . The valve 14 is located between the reservoir 10 and podcamera space. 13 and is made normally open in the direction of this space, and the buttons 15 are made normally and are located circumferentially between the reservoir 10 and the annular volume of 16, which communicates with the expanding: 9 and formed. INSULATION.CONTIC CASE I and porcelain cover 8. Kpapan 14 is an adjacent ring 17, encompassing the main contact 5 and installed between the shoulder //; in the case of the feedthrough contact 7 and the flange 3, in which several elliptical holes 18 are made, which serve as the working channel of the valve. The mechanical connection of the valves 14 and 15 is carried out by means of the rods 19 which can be spring-loaded with springs 2O on the side of the valves 15. The extinguishing device is filled with Ayrol acH-nodkostkostuyu, for example, transformer oil, up to level 21. The dummy device works as follows; at the beginning of the shutdown process, until the contrasts diverge, the second contact 5, mixed into the reservoir 10, pushes liquid out of it, which, when the valves 15 are closed, through the openings 18 of the normally open valve L 14, flows into the subcamera

6965536

Claims (2)

Something cost-effective .13, creating an arc with a miniature camera 4 kabytochko podlokker THAT increases the electrically stronger 5 stronger than tsu1: -Gasp; nyhdkosPi i podzvpliv it to intense kkktulsnym, After opening the contacts 5 and 6 and air iim e ctr: chesky cGU, under the action of the indicated excess gap pressure, a pert / ct / hp liquid of increased aperture aptness occurs, podamernoe) of space 13 through blown channels 1-2 through a pentred hole 11, in which the arc burns, into the expander 9 under the atmosphere it. This re | | current forms an intense akshulyy blast, denouncing the arc gap and contributing to the thinning of the arc. When small TOEOBIs are disconnected when the energy of the electric arc is not enough to create the necessary autoblow G, the backpressure in the subcamera chamber is not large, the valve 14 remains open, providing them with a full blast due to a forced supply of the displaced by the moving pin 5 to the pressure switch. In the course of the entire P-switch, this E.1puls ™ blast exerts an arc across all the channels of the chamber as Ex opens, contributing to the effective extinguishing of the electric arc at low currents. When disconnecting bopitshh currents hash. electric arc occurs under the action of auto blow. At the same time, a large level of motivation in the under-chamber space 13 causes a clatter 14 and, in the meantime, opens up, the valves 15 associated with it, the section 5 of the tank Yu from the under-chamber space 13 and. The turnip, displaced by the important driver of Volume 5, liquid through the annular volume 16 into the expander 9j fused, thus:) brave. the reservoir Yu. is high and ordinary IO from porcelain, from high pressure and excluding the dangerous braking of the mobile contact 5. This device is from a mechanic port. to connect the reservoir to the subcavity space, then to the expander, ensure reliable operation of the arcing device throughout the entire disconnected currents: from small capacitive currents - by organizing intensive pulsed pulses, to the maximum distances from the capacitive to the limit of the disconnected from the capacitive currents the elimination of the effects of the dangerous danger on the elements of the breath-taking device. Claims of the invention 1. High-voltage liquid circuit breaker extinguishing device containing an expander, a hollow porcelain insulator, inside which is located. Insulating case with arc extinguishing chamber, forming an annular volume fixed and movable contacts, filled tank small current damping is indicated, the valve system is out of alignment at least two, one of which is normally installed is installed in the specified annular volume, and the other 6 38 is normally open towards the chamber side. transtva installed in between the reservoir and podkamernym space of the arc chute. 2, the choke-arrester according to claim 1, characterized in that the normally-open valve is designed as a spring-loaded ring, which covers the movable contact. 3, the arcing device of claim 1, characterized in that, with the whole provision of self-reproducibility, said mechanical connection of the valves is made elastic, for example, in the form of a spring-loaded rod. Sources of information taken into account in the examination 1.Catalogue of the company Detfie-A & sthonTi Switches HPQE. D111 June 1967, p. 6, 2.Patent of France No. 1443О21, cl. music, 1966 prototype),