DE7734829U1 - High voltage switch - Google Patents

Description

CEM 476/76 Ke / dh

BBC Aktiengesellschaft Brown, Boveri & Cie., Baden (Switzerland)

High voltage electrical switch

The invention relates to a high voltage switch, in particular a gas circuit breaker with self-extinguishing of the arc, in which a column filled with insulating gas quenching chamber having a separate by a relaxation space compression space, further a movable and a fixed contact member and a passage from the compression chamber into the expansion space for the compression chamber by the Arc heated gas used for extinguishing.

Such switches are for example from the German.

Patent specification 1 of ^ 121 and from French patent application No. 75/25172, published under the \ 'ur.r.er 2 28 2 711. They are particularly suitable for switching off high-intensity currents, as the pressure required - to achieve the extinguishing process :; through ö-asent cpar.r.unc into the relaxation room - generated by heating due to the energy dissipated in the arc. There are already switches with Ein ^ r.lö-cohur.r dc? Arc has been proposed which have an improved L "Ech> 2mmer and with which currents both high and low intensity can be switched off. Such improved apparatus are in French patent applications No. 76/31503, filed on October 20, 1976,

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No. 7 6. 3 S '- 2 3, submitted ην. «.J. '. "Η ·: ¹ .Vr: ■ I ⁰ Y ¹ ' and No. 7C / 3 ^! L7C3> ^p i-f 'handed down on: H. \ ^: Ovemb <r ^ ⁿ 76 just described.

There are also switchgear em ''. autc-pr.eumatic effects known, in which the L i <-htl r-ren. will see that mechanically cin ^p r Lös · - - mi overall ice pressure gas "Lei nricht clothes with '.';.!?. Olber and cylinders is generated, and the I part device r.it in correlation of the effnungsbewegung movable scarf ": ■ '. iickes is operated. Such switches are described, for example, in d -.- r French patent application ' r. 75/3126:, incorporated on October 13, 1975 under the Ti ', el "Appareil de commutation avec soufflé de 1'arc electrique de coupure". They are particularly suitable for switching electrical currents with a frequency of 50 or 60 Hz. However, if it applies to currents of low frequency, both

_L ^! ; For example, to switch 16 2/3 H ~, the deletion process is more difficult due to the short exposure time.

The invention is based on the task of an electrical To create a switch, which both currents m: '~ 16 2/3 Hz as well as sclcne with 5C or 6C Hz and both currents with can switch more strongly as well as those with weak intensity.

According to the invention, this is achieved in that a mechanical extinguishing device known per se with piston and 1 \ _ _inder is provided, which can be actuated in correlation with the opening movement of the movable contact piece and which is connected to the compression chamber via a non-return valve in such a way that gas only flows from the mechanical extinguishing device can flow into the compression space.

According to a preferred, first embodiment , the mechanical extinguishing device can be mechanically connected to the movable contact piece via a delay element in this way.

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ι; .η <: οι ;, tia: ■: ~:: ■ ..ie (''er'iniii er der Oef f only.movement of the movable switch with a '.'. υ ' I ν er: .?. _ ■ Latter ^M eilcL- the Oeffnungsbe; i.rcnd .'_ ^■: ·, "- -" rung botätigbar kind Thanks commanding * 'arrangement verrt ärkt is mechanically verdie.ite "e Gee w.! -

',, v / egurig d'? r,! jcv.TT.lichür. : '. chr. : ί j tücker, the effect of the through '•: rhil -; unc ™ due to the Enert'iu originating from the “, i chtbor ^ n - compacted CYes:; it and extends the blowing time. Through this .will :. r. ^ probably currents with .16 Γ / 3: ί.:. as well as such ir.it '-_ od ^ -r fO Hz; r.i Γ * i ^'. 'mr- :: iit scr.iv-cher and stronger · In-

IC tor ..; it; according to ger.ch.

In the drawing are Ausf ühru; i _; :; shown atüp 'ele of the invention.

Es -iges:

Fig. 1 shows an extinguishing chamber in vertical section, the bev.'egliche on the left Contact piece in cffcr.er, right in ge

closed position

FIG. 2 shows an extinguishing chamber in vertical section according to a second embodiment of the invention.

The invention will hereinafter be applied in 2C explains an electrical switch as described in the above-cited French patent application No. 76/31503 is; the description of this patent application is incorporated by reference in the present description. It goes without saying, however, that the invention is not exclusively applicable to such a switch type but just as well with other switches, for example those listed in the introduction to the description Patent applications and patents are described.

BBC Baden

CEM 476/76

The electrical switch gcinäss Fig. 1 has a cylindrical Main housing 1 made of insulating material, which forms an arcing chamber; this is tightly closed by a cover 2 and filled with an insulating gas such as SF.

«3 In the center of the cover 2 is a cylindrical pin 3 from Conductive material arranged, which connection terminal is for the power supply to a stationary one known per se Contact piece 4; the latter is inside a second, cylindrical one Housing 5 arranged from insulating material. The chief Pin 3 extends over a certain distance into the interior of the housing 1 and closes on its lower end with a disk-shaped part 3a from below which the fixed contact 4 is mounted. That cylindrical housing 5 is closed at its upper part by the disc 3a of the expanding pin 3, and on its lower part by a one-piece with the housing 5 Wall 5a closed. This · - · wall 5a divides the arcing chamber into a compression space 5 and a relaxation space 7

In the compression space 6, a coil 11 surrounds the stationary one Contact piece 4. One of the coil end is electrically connected to the disk 3a, while the other coil end? electric with a first, directly below the fixed one Switching piece 4 arranged ring electrode 12 is connected.

A second ring electrode 18 with a similar shape to that of the ring electrode 12, but with a downward, cylindrical extension 25 provided, is arranged opposite the ring electrode 12 and completely from the stationary Switching piece 4 isolated. The ring electrode 18 is carried by an annular holder 19, "which in turn with the cylindrical housing 5 via radial spokes 23 connected is.

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A cylindrical pin 13 made of insulating material is coaxial to the stationary contact 4 and the two ring electrodes J-2 and 18 arranged; it is attached to the conductive pin 3 and thus extends it downwards.

r ^ The movable contact piece 14 is through a cylindrical The pin is made of conductive material and can be inserted coaxially into the interior of the stationary contact piece 4 and can be axially slide with slight radial play in a central bore 15 of the wall 5a; this happens to me. known, not shown

IQ provided emergency organs. The pin of the movable switching element 14 is provided axially over a certain part of its length with a bore 16 into which the pin 13 protrudes with slight radial play when the movable switching pin 14 is in the closed position. It is also provided with a radial Bonrung 17 via '' Ie in conjunction with the axial bore 16, the two spaces 6 and 7 interconnected v / ground if the movable contact 14 has traveled a certain stroke i ". Geffnungsrichtung. During the First part of the opening stroke d3s movable switching piece 14, the pin 13 serves a dual purpose, on the one hand as a guide for the movable switching piece 14, on the other hand to prevent the gas from escaping into the expansion space.

An axial stop 32 is rigidly attached to the movable contact piece 14, on which a stop is located coaxially to the movable contact piece 14 mounted coil spring 31 is supported. This burdened in the upward direction, a shell 30, polyhedra, can slide coaxially to the movable contact piece 14. The axial movements the shell 30 are arranged on it by a radial Pinger 33 limited, which in a longitudinal gap 34 in movable contact piece 14 engages.

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The cylindrical housing 5 is fastened with screws 35 to the lower part of a cylinder 36 which is fastened to the cover 2 at its upper part. Inside the cylinder 36, a movable annular piston 37 can slide on both the conductive pin and the inner wall of the cylinder 36. The piston 37 is loaded in the downward direction with a helical spring 38, which has a lower spring force than the spring J> 1 .

The cylinder 36 is at the lower part by the disk 3a of the conductive pin 3 closed; this disc-shaped part is provided with holes 60 for the passage of gas. The Eohrungen 60 are closed with non-return flaps 39 in such a way that through them gas from the space 40, which flows through the disc 3a and the piston 37 is formed, only flow out, but not inwards. can.

Pins 41 attached to piston 37, which extend parallel to conductive pin 3 and to the movable contact piece 14, slide in longitudinal bores 42 of disk 3 a and of cylindrical housing 5. In the closed position of the movable switching piece 14 (right part of FIG. 1) LJteher, the pins 41 on the stop against the disc 30; As a result, a piston 37 is also at the stop against the or. "vor. Fi ..-. r, ~ ch ^T , oi; des '■'■;;! Indians 36; the celebrations 31 and 38

The function ici.r "knows: se ie:;, described switch i rj.t ¹ O ¹ ~ end: O Hec: ■ ε in a figure i: jt the switch ir. -R ^r - \; -. Rhi n -sener position ge ;; ei ^ t. Z ^ m Ab rc ha it er; eier S tr er. it becomes the movable Se-h '. 1'.: -, t-'ick 14 with eit. · " ¹ . r; ^r ei rj.f '.en, avenge:; ir, -e:; t hastened adjustment mechanism downwards When it moves from the stationary contact 4 and its upper end comes on the HHje of the ring electrode 18, a primary 'arc 27 is formed between this ring electrode 18 and the

BBC Baden

CEM 476/76

connected to the coil 11 ring electrode 12. Under the Due to the magnetic field generated by the coil 11, the primary arc 27 is deflected radially outwards, elongates and rotates in space 26 between electrodes 12 and 18. The heat emanating from the primary arc heats the gases contained in the compression chamber and increases their pressure in that the bore 16 in the movable contact piece 14 remains closed by the pin 13. If at the further Downward movement of the movable contact 4 whose upper end extends from the cylindrical extension 25 of the Removed ring electrode 18 is created between this extension 25 and the upper end of the movable contact piece 14 a secondary arc 28 (left part of Fig. 1).

At this moment, the bore 16 in the movable switch - "- Tück lh not more by the pin I3 sealed and the holes 17 are located at the height of Entspar.nungsraums 7. The compressed in the compression chamber gases may r.unmehr at high speed Relax in the relaxation room while blowing out the arc 28.

Parallel to the thermal effect of the primary arc 27, a part of piston-compressed (37) gases also helps to extinguish the arc 28 during the last part of the opening stroke of the movable contact element lh. In fact, the movable contact piece 14, after a certain time delay, is dragging down the shell 3C from the moment a>, where the spring Y \, d: i · relaxes, no longer υ: e power station!; · .- j; the spring 3E compensating ':. Then the piston 37 moves downwards under the spring action (38) and compresses the gas in chamber 4 0. This flows through the openings 60 and the open non-return flaps 39 into the space G and blows in the process the arc 28 if by then the eggs have been extinguished by the hot:.; sen, condensed

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Gases not stattge ^f ..: the has what (16 2/3 Hz) may be the case especially at low currents with .tensität or low frequency.

The switch is closed by lifting the movable contact piece 14. During this upward movement

the shell 30 strikes the lower end of the pins 41, whereby the piston 37 is raised in the chamber 4o. Fresh gas enters the chamber 40 via bores 43 in the cylinder 36, via radial channels 44 in an outer collar IQ 37a of the piston 37 and via a non-return valve arranged in a bore of the piston 37.

A second embodiment of the invention is shown in FIG. The same elements as in Fig. 1 or those with the same Function are denoted by the same reference symbols.

In contrast to FIG. 1, in which the cylinder 36 was attached to the cover 2 of the cylindrical housing 1, is he of a spacer sleeve 47 at a fixed distance to the Bottom 46 of the housing 1 carried. The movable piston 37 can slide inside the cylinder 36 on a shaft 48, which is an axial extension of the movable contact piece and is connected to it via an insulator 49 is.

In closed switch position; the piston is arranged 37 by the spring 38 in contact with a the shaft 48 is held axial stop 32, the spring 38 is Eiteren at a v / arranged on the shaft ^l \ Q or on the insulator 49, supported axial stop 5I. The Fscier 31 is housed in the chamber 40 between the piston 37 and the base 36b of the cylinder 36. As in the embodiment according to FIG. 1, the spring 31 has a greater spring force than the spring 38, but when the switch is closed, both are

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Springs no longer fully, but only slightly tensioned.

The lower part of the chamber 4o is with the space 6 via a Line 52 connected, in which the non-return valve 39 is arranged. In the zone into which the extinguishing gas flows, the line 52 is covered with a refractory protective sleeve 53.

The mode of operation of the switch shown in FIG about the same as that shown in FIG. Compared to the downward movement of the movable contact piece I ^ and the shaft ^ 8 the downward movement takes place of the piston 37 with a certain time delay. The fact that the spring 31 has the greater force is during the first part of the downward stroke of the shaft ^ 8 initially only the spring 38 is compressed without the piston 37 emotional. As soon as the forces of the two springs are equal, the piston 37 compresses that contained in the chamber 10 Gas that passes through the non-return valve 39 into the space 6 and there the. supplied by heating compressed gas to complete the arc extinguishing if it has not already taken place.

In both of the embodiments described, the effect of the mechanical extinguishing device can be delayed to that effect be that the non-return flap 39 are trated flaps that only open when the pressure difference in the rooms 6 and 40 exceeds a predetermined value.

It goes without saying that the invention is not restricted to those shown and described in the drawing, by way of example only Limited versions. Numerous changes can be made without departing from the scope of the invention to leave.

Claims (3)

BBC Baden t <. . . 476/76 DE / GM claims for protection 1. High-voltage switch, especially gas switch with self-extinguishing of the arc, in which one with The quenching chamber filled with insulating gas has a compression chamber separated from an expansion chamber, also a movable and a fixed contact piece as well as a passage from the compression space into the expansion space for the through in the compression space the arc heated and used for the extinguishing gas, characterized in that a per se known mechanical extinguishing device; which contains a piston (37) and a cylinder (36), ir.it dem movable contact piece (14) is coupled by means of elastic members (31, 3S) arranged between them and that the passage (60, 52) from the compression space (6) to the mechanical extinguishing device (36, 37) at least contains a backlash element (39) which only has a gas flow allowed in the direction of the compression chamber (6) 2. High-voltage switch according to claim 1, characterized in that the piston (3 ⁷ ) of the mechanical extinguishing device (36, 37) is under the action of a spring (38) for its drive and is connected to the movable contact piece (14) by means of a further spring ( 3D, a driver shell (30) and pins (41) is coupled (Fig.l). 3. High-voltage switch according to claim 1 "characterized in that that the piston (37) of the mechanical extinguishing device (36, 37) by means of a spring (38) and an insulator (49) is coupled to the movable contact piece (14) (Fig. 2). 7734829 09/21/78