CH189737A - Arc blowing alternating current electrical switch. - Google Patents
Arc blowing alternating current electrical switch.Info
- Publication number
- CH189737A CH189737A CH189737DA CH189737A CH 189737 A CH189737 A CH 189737A CH 189737D A CH189737D A CH 189737DA CH 189737 A CH189737 A CH 189737A
- Authority
- CH
- Switzerland
- Prior art keywords
- arc
- switch according
- sub
- electrode
- blowing
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
- H01H33/16—Impedances connected with contacts
- H01H33/164—Impedances connected with contacts the impedance being inserted in the circuit by blowing the arc onto an auxiliary electrode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
- H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
- H01H33/7023—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by an insulating tubular gas flow enhancing nozzle
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Interrupteur eleetrique ä courant alternatif ä soufflage de rare. 0n sait qu'en principe un arc electrique s'eteint d'autant plus facilement que sa lon- gueur est plus Brande. C'est pourquoi certains interrupteurs, dans lesquels 1'arc est souffle par un fluide comprime, sont construits de telle Sorte que 1e soufflage allonge Parc 1e plus fortement possible Pendant toute sa duree. Electric switch with alternating current with rare blow. We know that in principle an electric arc is extinguished all the more easily as its length is greater. This is why certain switches, in which the arc is blown by a compressed fluid, are constructed in such a way that the blow extends the Park as strongly as possible throughout its duration.
D'autre Part, il est egalement connu que 1'energie dissipee par 1'arc augmente avec la longueur de cet arc et que la puissance des moyens de soufflage doit etre proportionnee ä cette energie electrique depensee par 1'arc Pendant la rupture. On the other hand, it is also known that the energy dissipated by the arc increases with the length of this arc and that the power of the blowing means must be proportionate to this electrical energy expended by the arc during the rupture.
Partant de cette constatation, an s'est efforee de reduire cette energie autant que possible et Fon a propose, ä cet effet, diffe- rents moyens limitant Pallongement de 1'arc par le soufflage ä une distance magima bien deterrninee et constante Pendant toute la du- rk de 1'interruption. Starting from this observation, an endeavor has been made to reduce this energy as much as possible and, to this end, various means have been proposed to limit the elongation of the arc by the blowing to a well-determined and constant magima distance Throughout the entire duration of the interrupt.
L'invention a pour but d'ameliorer 1e fonctionnement de ces interrupteurs par 1'em- ploi de moyens limitant temporairement cet allongement de 1'arc, Pendant que 1'intensite instantanee du courant alternatif qui 1e par- court est superieure ä une valeur determinee d'avance. The object of the invention is to improve the operation of these switches by the use of means temporarily limiting this elongation of the arc, while the instantaneous intensity of the alternating current which passes through it is greater than a value determined in advance.
L'inventeur a reconnu, en effet, que pour pouvoir couper avec une source de soufflage donnee la puissance electrique la plus Brande possible, il est seulement utile de reduire 1'allongement de 1'arc Pendant la fraction de la Periode du courant oii 1'intensite est impor- tante et oü un. arc long dissiperait une quan- tit6 d'energie tres Brande, mais que, pour 1e reste de la Periode oü 1'intensite est faible, ce deinier inconvenient est negligeable par rapport ä, 1'effet utile obtenu par un allon- gement supplementaire de 1'arc. The inventor has recognized, in fact, that in order to be able to cut with a given source of blowing the most Brande electrical power possible, it is only useful to reduce the elongation of the arc During the fraction of the Period of the current where 1 he intensity is important and where a. long arc would dissipate a very large amount of energy, but that for the rest of the Period when the intensity is low, this last inconvenience is negligible compared to the useful effect obtained by an additional elongation of the bow.
Dans 1'interrupteur selon 1'invention, an tend, par consequent, ä, limiter 1'allongement de 1'arc et ä 1e maintenir tres court Pendant que son intensite est forte et ä 1'allonger ensuite eonsiderablement des quo son inten- sitA devient faible. In the switch according to the invention, an tends, therefore, to limit the elongation of the arc and to keep it very short while its intensity is high and then to lengthen it considerably as its intensity increases. becomes weak.
L'invention coneerne, en Premier lieu, los interrupteurs dans lesquels 1e fluide de souf- flage est un gaz comprime tel quo Fair, mais peut s'appliquer egalement aux interrupteurs dont l'are est souffle par un liquide, tel quo 1'huile, mir sous Pression par une pompe ou dispositif analogue. The invention relates, in the first place, to switches in which the blowing fluid is a compressed gas such as Air, but can also apply to switches whose are is blown by a liquid, such as oil. , mir under pressure by a pump or similar device.
L'invention est applicable aux disjone- teurG dans lesquels; la plus Brande Partie de Farc se developpe :dans un milieu oü regne une faible Pression, voisine de 1a press.ion atmo:spherique. The invention is applicable to circuit breakers in which; most Brande Part of Farc develops: in an environment where low pressure reigns, close to the atmospheric pressure.
D'autre Part, elle ameliore aussi 1e fone- tionnement des. interrupteurs dans lesquels une Brande Partie de Farc se developpe i. l'interieur dune chambre remplie d'un gaz ä forte Pression. On the other hand, it also improves the operation of the. switches in which a Brande Part of Farc develops i. inside a chamber filled with a gas at high pressure.
Le dessin ei-annexe montre, ä, titre d'exemple et s@chematiquement, plusieurs formes d'execution de 1'objet de Finvention. Los fig. 1, 6 et 7 sont des coupes de trois exemples d'execution; los fig. 2, 4 et 5 mon- trent, en coupe, trois variantes dune elec- trode darret, la fig. 3 etant une vue en plan de 1'electrode suivant fig. 4. The appended drawing shows, by way of example and schematically, several embodiments of the object of the invention. Los fig. 1, 6 and 7 are sections of three examples of execution; the fig. 2, 4 and 5 show, in section, three variants of a stop electrode, FIG. 3 being a plan view of the electrode according to fig. 4.
Le disjoneteur ;suivant fig. 1 comporte un contact fixe 1 et un contact mobile 2 tra- versant diametralement un canal 3 par lequel Fair de soufflage est dirige Sur l'are de rup- ture se developpant ä la eAparation des con- taets. Le canal 3 se termine par une tuyere 4 debouchant dans une large cheminee 5 com- muniquant aveG Fatmosphere. The circuit breaker; according to fig. 1 comprises a fixed contact 1 and a movable contact 2 passing diametrically through a channel 3 through which the blowing air is directed onto the breaking edge developing at the separation of the contacts. Channel 3 ends in a nozzle 4 opening into a large chimney 5 communicating with the atmosphere.
A Finterieur de la tuyere 4 est prevue une electrode 6 reliee au contact 1 et une electrode,, 7 reliee au contact 2 et disposee dans; Faxe ,de 1a tuyere 4. Inside the nozzle 4 is provided an electrode 6 connected to the contact 1 and an electrode ,, 7 connected to the contact 2 and placed in; Faxe, of the nozzle 4.
Au-dessus de ces electrodes. et de cette tuyere, ä Finterieur de la cheminee 5, est prevue une electrode darret 8 reliee ä 1'elec- trode 6 et au contact 1. Celle-ei est consti- tuee par une tubulure disposee concentrique- ment autour de laxe commun de la tuyere 4 et de 1'electrode 7. Above these electrodes. and from this tuyere, inside the chimney 5, there is provided a stop electrode 8 connected to the electrode 6 and to the contact 1. nozzle 4 and electrode 7.
Le fonctionnement de co dispositif est 1e suivant: Loraque 1e contact 2 se separe du contact 1, 1'aro qui & 'amorce entre eux est souff1e d'abord sur les electrodes 6 et 7, so deplace ensuite 1e long d'elles et, arrive ä leurs extre- mitAs libres, il s'ineurve vers 1'electrode dar- ret 8 jusqu'ä. ce qu'il soit commute entre 1'electrode 7 et 1'electrode darret 8 et se trouve plaee dans laxe du courant de souf- flage. Il se developpe Bone ü 1'exterieur de la tuyere et los gaz qu'il & met sont evacuts librement par 1a cheminee 5. The operation of this device is as follows: When the contact 2 separates from the contact 1, the aro which strikes between them is first blown on the electrodes 6 and 7, then moves along them and, arrives at their free ends, it flows towards the stop electrode 8 up to. that it is switched between the electrode 7 and the stop electrode 8 and is placed in the axis of the blowing current. It develops Bone outside the tuyere and the gases it emits are evacuated freely through the chimney 5.
S'agissant d'un courant alternatif dont Fintensite passe periodiquement dune valeur maxima ä la valeur zero, il arrive 1e plus souvent qu'au moment oü 1'arc vient d'etre commute sur 1'etectrode darret 8, Fintensite est tres forte. De ee fait, 1e diametre de l'are qui est approximativement proportionnel ä. la racine carree de Fintensite est egalement tres Brand, de Sorte quo la section de l'are Bouche completement 1e creux de 1',electrode darret. Aussi longtemps quo Bure cet etat, Farc ne peut par, sous Faction du soufflage, s'allonger au delä de cette electrode darret puisque la Partie de l'are qui la depasserait serait court-cireuitee par 1'electrode. Mais des quo, avec la @diminution de Fintensite du courant la section .de l'are se retrecit et ne Bouche plus 1e creux de 1'eleetrode darret, Farc entre los electrodes 7 et '8 subit, sous Faction du soufflage, un allongement sup- plementaire, ce qui facilite son extinction definitive au moment oü Fintensite a atteint la valeur zero. With regard to an alternating current, the intensity of which periodically passes from a maximum value to the zero value, it most often happens that at the moment when the arc has just been switched over on the stop electrode 8, the intensity is very strong. Hence, the diameter of the are which is approximately proportional to. the square root of the intensity is also very high, so that the section of the are completely covers the hollow of the stop electrode. As long as it is in this state, Farc cannot, under the action of the blow, extend beyond this stopping electrode since the part of the are which exceeds it would be short-circuited by the electrode. But as of now, with the decrease in the intensity of the current, the section of the are shrinks and no longer blocks the hollow of the stop electrode, the Farc between the electrodes 7 and '8 undergoes, under the action of the blowing, an elongation additional power, which facilitates its definitive extinction when the intensity has reached the zero value.
Ains.i Farc reste relativement court tant quo son intensite est Brande et degage, par Rsuite, une energie et un volume de gaz fai- bles de Sorte qu'il peut etre eteint apres- son allongement supplementaire, par une energie pneumatique reduite. Thus, the arc remains relatively short as long as its intensity is reduced and releases, as a result, a low energy and volume of gas so that it can be extinguished after its further elongation, by reduced pneumatic energy.
Pour obtenir ce fonetionnement favora- ble, il ruffit quo 1e diametre D de 1'electrode darret 8 soit au moins aussi Brand quo 1e diametre minimum d de la tuyere de souf- flage 4; cette valeur D depend egalement de Fintensite maxima quo Pinterrupteur doit pouvoir couper. D'autre pari, la distance A entre 1'eleetrode centrale 7 et 1'eleetrode dar- rot 8 est de pr6i6rence choisie au meins aussi Brande quo la distance a pr6vue entre los deux electrodes 6 et 7, distance donnee par la tension nominale de Finterrupteur. En Fabsence de ces Mectrodes 6 et 7, la distance _9. serait ä choisir analoguement par rapport aux contacts 1 et 2. Los fig. 2 ä 5 montrent des variantes de 1'electrode darret B. Cello de 1a fig. 2 est constituee par un anneau tronconique dont 1e diametre minimum D correspond ä celui de 1'electrode 8 de la fig. 1, 1a base du cöne ei;ant placee en face des contacts. L'electrode des fig. 8 et 4 est constitu6e par un anneau cylindrique 9 de Brand diametre pourvu, ä 1'int6rieur, de saillies radiales 10 se termi- nant sur une circonference de diametre D. L'61ectrode de la fig. 5 est semblable ä la precedente mais comporte, en plus, ä 1'extr6- rnit6 libre des saillies 10, des prolongements perpendiculaires 11 se terminant sur une cir- conf6rence de diamUre D. Los Mectrodes darret suivant fig. 4 et 5 sont pr6vues ainsi pour permettre la d6tente radiale des gaz. To obtain this favorable operation, it suffices that the diameter D of the stop electrode 8 is at least as great as the minimum diameter d of the blowing nozzle 4; this value D also depends on the maximum intensity at which the switch must be able to cut. On the other hand, the distance A between the central electrode 7 and the back electrode 8 is preferably chosen at least as closely as the distance provided between the two electrodes 6 and 7, distance given by the nominal voltage of switch. In the absence of these methods 6 and 7, the distance _9. should be chosen analogously with respect to contacts 1 and 2. Los fig. 2 to 5 show variants of the B. Cello stop electrode of FIG. 2 is constituted by a frustoconical ring whose first minimum diameter D corresponds to that of the electrode 8 of FIG. 1, the base of the cone ei; ant placed in front of the contacts. The electrode of figs. 8 and 4 is constituted by a cylindrical ring 9 of diameter Brand provided, on the inside, with radial projections 10 terminating on a circumference of diameter D. The electrode of FIG. 5 is similar to the previous one but additionally comprises, at the free end of the projections 10, perpendicular extensions 11 terminating on a circumference of diameter D. Los Mectrodes stop according to fig. 4 and 5 are provided in this way to allow the radial expansion of the gases.
Enfin, 1'61ectrode 8 peut dgalement etre constituee par une grille, de prUkence cylin- drique, et comportant au centre une ouverture plus largo quo los ouvertures p6ripheriques, 1e diametre de Fouverture centrale etant au meins aussi Brand quo la secfion la plus faible de la tuyere de soufflage. Finally, the electrode 8 can also be constituted by a grid, of cylindrical precaution, and comprising in the center an opening wider than the peripheral openings, the diameter of the central opening being at least as wide as the smallest section of the the blowing nozzle.
L'invention s'applique egalement aux in- terrupteurs dans lesquels an inAre encore des resistances dans 1e circuit pour pouvoir re- duire 1'6nergie de soufflage. Un tel appareil est represente par la fig. 6. The invention also applies to switches in which there are still resistors in the circuit in order to be able to reduce the blowing energy. Such an apparatus is represented by FIG. 6.
La Partie inf6rieure est identique ä la fig. 1 mais, au-dessus des organes de cette figure, an a prevu une 6lectrode auxiliaire 12 reli6e avec 1'electrode 7 par 1'interm6diaire de la resistance 18. Le diam6tre int6rieur de 1'6lectrode auxiliaire 12 creuse est bien infe- rieur ä D. D'autre Part, 1'61ectrode darret 8 est encore reliee ä une electrode d'extr6mite 14. Los differentes electrodes 7, 8, 12 et 14 sont .disposees Tune au-deseus de 1'autre dans Faxe de 1a tuyere 4, A la coupure, et tant quo 1'intensit6 du court-circuit ä couper est sup6rieure ä une valeur I determinee d'avance, 1e fonetionne- ment est 1e meme quo celui de Fappareil de la fig. 1. Des quo Fintensit6 descend au- dessous de I, 1'arc s'allonge au delä de 1'elec- trode darret 8, s'incurve sous 1'effet du souf- flage et rencontre, au bout d'un certain temps, Felectrode 12. Au Passage ä z6ro de Finten site, la Portion de droite de 1'arc entre los electrodes 7 et 8, laquelle est shuntee par la r6sistance 18, s'eteint et un arc roste amorce entre los 6lectrodes 8 et 12. Cet arc, dont 1e diametre est tres inferieur ä celui de 1'alee- trode d'arrat 8, est completement enveloppe dans 1e courant de soufflage. Il s'allonge donc tres RTI ID="0003.0269" WI="19" HE="4" LX="1118" LY="872"> rapidement, vieret en contact avec Felec- trode d'extremits 14, de sorte qu'il est com- mute entre los electrodes 14 et 12. Le courant qui parcourt cet arc etant tres reduit, cet arc est coup6 au prochain Passage ä zero de 1'intensite. The lower part is identical to fig. 1 but, above the members of this figure, an auxiliary electrode 12 has been provided, connected with the electrode 7 via the resistor 18. The inside diameter of the hollow auxiliary electrode 12 is much less than D. On the other hand, the stop electrode 8 is still connected to an end electrode 14. The different electrodes 7, 8, 12 and 14 are arranged one above the other in the area of the nozzle 4 , On breaking, and as long as the intensity of the short-circuit to be broken is greater than a value I determined in advance, the operation is the same as that of the apparatus of FIG. 1. As soon as the intensity drops below I, the arc extends beyond the stop electrode 8, bends under the effect of the blowing and meets, after a certain time , electrode 12. At the Zero Crossing of Finten site, the right-hand portion of the arc between electrodes 7 and 8, which is shunted by resistor 18, is extinguished and a pink arc initiates between electrodes 8 and 12. This arc, the diameter of which is much smaller than that of the stop rod 8, is completely enveloped in the blowing current. It therefore elongates very RTI ID="0003.0269" WI="19" HE="4" LX="1118" LY="872"> quickly, and comes into contact with the end electrode 14, so that it is switched between the electrodes 14 and 12. The current which flows through this arc being very small, this arc is cut at the next passage to zero of the intensity.
Pour los appareils ä, tr6s Brand pouvoir de coupure, la reduction du courant s'effectue en deux temps, au moyen de deux resistances introduites successivement. For devices with a very high breaking capacity, the reduction of the current takes place in two stages, by means of two resistors introduced successively.
Ainsi quo 1e montre la fig. 7, 1'invention est egalement applicable aux interrupteurs ä ruptures multiples. Dans 1'appareil represente par cette figure, 1'arc s'allumant entre los contacts 1 et 2 est souff16 sur los 6lectrodes 6 et 7 et partag6 en deux ares plac6s chacun dans laxe dune tuy6re 4 et 4', entre Tune de ces Mectrodes et l'une des kectrodes dar- ret 8 et 8' pr6vues dans los deux chemin6es 5 et 5'. Ces electrodes darret sont reliees entre olles et isolks des contacts. Le fonc- tionnement est analogue ä celui de 1'appareil de la fig. 6. Los arcs se d6veloppant dans los chemin6es ne peuvent depasser los slectrodes darret 8 et 8' quo lorsque 1'intensit6 du cou- rant est descendue en dessous dune valeur d6terminee. A ce moment, ils s'incurvent, viennent en contact avee los 6lectrodes auxi- liaires 12 et 12' de sorte quo los Parties een- trales 6-12 et 7-12' des ares s'6teignent au Premier Passage ä zero de Fintensite. Los fractions d'are 8-1.2 et 8'-12' qui subsis- tent s'allongent sous Faction du soufflage qui las enveloppe et viennent en contact avec las electrodes d'extremite 14 et 14'. Finalement, il ne raste que des arcs entre las electrodes 12-14 et 12'-14' et comme Fintensite qui las parcourt est tres reduite, il s'eteignent au prochain Passage ä zero de 1'intensite. As shown in FIG. 7, the invention is also applicable to multiple break switches. In the apparatus represented by this figure, the arc igniting between the contacts 1 and 2 is blown on the electrodes 6 and 7 and divided into two ares each placed in the axis of a nozzle 4 and 4', between one of these Methods and one of the stop kectrodes 8 and 8' provided in the two chimneys 5 and 5'. These stop electrodes are connected between olles and isolated from the contacts. The operation is analogous to that of the apparatus of FIG. 6. The arcs developing in the chimneys can only pass the stop electrodes 8 and 8' when the intensity of the current has fallen below a determined value. At this moment, they bend, come into contact with the auxiliary electrodes 12 and 12' so that the central parts 6-12 and 7-12' of the ares are extinguished at the First Passage to zero of the intensity. . The fractions of are 8-1.2 and 8'-12' which remain elongate under the action of the blowing which envelops them and comes into contact with the end electrodes 14 and 14'. Finally, there are only arcs between the electrodes 12-14 and 12'-14' and as the intensity which traverses them is very reduced, they are extinguished at the next passage to zero of the intensity.
0n peut encore prevoir un autre moyen, particulierement simple, pour limiter tempo- rairement 1'allongement de Farc dans lee dis- joncteurs du type represente au dessin, dans lesquels cet arc est souffle ä traverse une ou plusieurs ouverturos ou tuyeres 4 et 4', pre- vues dans la paroi de la chambre de souf- flage 8, oü il s'amorce. It is also possible to provide another, particularly simple, means for temporarily limiting arc elongation in circuit breakers of the type shown in the drawing, in which this arc is blown through one or more openings or nozzles 4 and 4'. , provided in the wall of the blowing chamber 8, where it begins.
D'ans las disjoncteurs connus de ce genre et dann ceux represente#s. au dessen, la section des ouvertures au tuyeres 4 et 4' est telle- ment Brande quelle ne @s'oppose,ä aucun mo- ment, ä Fallongement de l'are au delä, de Ges tuyeres; cet allongement est, comme dearit, limite temporairement par une electrode spe- ciale B. 0r, il est possible de supprimer cette electrode 8 en donnant aux ouvertures ou tuyeres 4, 4' une section tolle quo l'are ne puisse pas los franchir aussi longtemps qu'il est traverse par un courant dune intensite superieure äcelle determinee d'avance. From years known circuit breakers of this kind and in those represented #s. in design, the section of the openings at the nozzles 4 and 4' is so wide that it does not at any time prevent the lengthening of the are beyond the nozzles; this elongation is, like dearit, temporarily limited by a special electrode B. 0r, it is possible to eliminate this electrode 8 by giving the openings or nozzles 4, 4' a section tolle quo the are cannot cross them also long as it is traversed by a current of an intensity greater than that determined in advance.
Cette section ou Ges sections servant ä la fois au Passage de l'are et du courant de soufflage sont faciles ä determiner en fone- tion de 1'intensite ä laquelle 1'allongement de l'are doit Atre arrete temporairement vu que, ainsi quo cela est connu, 1'arc se com- porte comme un conducteur de section varia ble proportionnelle ä 1'intensite. Si donc 1'arc engendre ä la separation de 4eux contacts est souffle dans une ouverture ainsi dimension- nee, il ne pourra la franchir sou6 Faction de soufflage aussi longtemps que la section de 1'arc, proportionnee ä 1'intensite qui 1e par- court, est trog Brande par rapport ä la sec- tion de 1'ouverture. Il en resulte quo 1'allon- gement de 1'are, souffl6 contra une teile ou- verture, est limite' dann la Partie de la Pe riode du courant Pendant laquelle 1'intensite est @superieure ä la valeur determinee pour laquelle la section de 1'ouvorture a ete choisie. Mais, des quo Fintensite du courant est des cendue en dessous de cette valeur, 1'allonge- ment de l'are est accentue par 1e ooufflage. This section or these sections serving both the passage of the are and the blowing current are easy to determine according to the intensity at which the elongation of the are must be temporarily stopped since, as well as as is known, the arc behaves like a conductor with a variable section proportional to the intensity. If, therefore, the arc generated on the separation of the two contacts is blown into an opening thus dimensioned, it will not be able to cross it under the action of blowing as long as the section of the arc, proportionate to the intensity which passes through it. short, is very wide in relation to the opening section. It follows that the elongation of the are, blown against such an opening, is limited in the part of the period of the current during which the intensity is greater than the value determined for which the section of the opening has been chosen. But, as soon as the intensity of the current is lower than this value, the elongation of the are is accentuated by the blowing.
La direction du mouvement des contacts est de preference perpendiculaire ä la direc- tion de soufflage et ä Faxe de Fouverture ou :des ouvertures:, comme montre au dessin. La .section de Ges ouvertures, qui ont, de pre- f6rence, la forme de tuyeres, peut etre eircu- laire ou allongee; dann ce dernier Gas., 1e Brand axe de la section Sera place dans 1e plan dans lequel se meut 1e contact mobile. The direction of movement of the contacts is preferably perpendicular to the direction of blowing and to the axis of the aperture or apertures, as shown in the drawing. The section of the openings, which preferably have the shape of nozzles, can be circular or elongated; in this last Gas., the 1st Brand axis of the section Will be placed in the 1st plane in which the movable contact moves.
La paroi interieure des tuyeres est en matiere isolante mais pourrait aussi etre metallique. Däns ce dernier Gas, la tuyere pourrait etre reliee ä Vun des contacts. The inner wall of the nozzles is made of insulating material but could also be metallic. In the latter Gas, the nozzle could be connected to one of the contacts.
Pour appliquer Finvention au genre d'in- terrupteurs connu dans lequel 1e contact fixe, entourant 1e contact mobile, est creux et forme une tuyere de soufflage ä la sortie dune chambro de soufflage en dehors de laquelle Farc est allonge, il n'est pas non plus necessaire d'employer une electrode dar- ret speciale. Il suffit .de choisir 1a sectiön de cette tuyere suffisamment petite pour quo la contre-pression engendree par 1'arc empeche la sortie de l'are en dehors de cette ehambre, c'est-,ä-dire au delä de la section la plus etroite de la tuyere, aussi longtemps que Fin- tensit6 momentanee du courant n'est pas des- cendue au-dessous de la valeur I precitee. Ainsi Farc subit, apr6s cet instant seulement, un allongement supplementaire sous Faction du soufflage. Generalement, Ges tuyeres sont divergentes et sortent de la chambre de souf- flage. L'effet desire est accentue en prolon- geant cette tuyere ä 1'interieur de la cham- bre et en donnant ä cette Partie de 1a tuyere une forme interieure convergente, Jans 1e sens du soufflage et concentrique au contact mobile. Ainsi, l'are se maintient, aux fortes intensites, entre cette Partie convergente de la tuyere et 1e contact mobile, lequel, en se separant du contact fixe, plonge dan.s cette chambre. To apply the invention to the type of known switches in which the fixed contact, surrounding the movable contact, is hollow and forms a blowing nozzle at the outlet of a blowing chamber outside of which the arc is elongated, it is not it is no longer necessary to use a special stop electrode. It suffices to choose the section of this nozzle small enough so that the counter-pressure generated by the arc prevents the exit of the are outside this chamber, that is to say beyond the section the narrowest part of the nozzle, as long as the momentary intensity of the current has not fallen below the value I mentioned above. Thus Farc undergoes, only after this moment, an additional elongation under the action of the blowing. Generally, the nozzles are divergent and come out of the blowing chamber. The desired effect is accentuated by extending this nozzle inside the chamber and giving this part of the nozzle a converging internal shape, in the direction of the blow and concentric with the moving contact. Thus, the are is maintained, at high intensities, between this converging part of the nozzle and the first movable contact, which, by separating from the fixed contact, plunges into this chamber.
Claims (20)
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE189737X | 1935-04-25 | ||
| CH189737T | 1937-07-08 | ||
| DE205834X | 1937-07-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH189737A true CH189737A (en) | 1937-03-15 |
Family
ID=5721456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH189737D CH189737A (en) | 1935-04-25 | 1936-04-04 | Arc blowing alternating current electrical switch. |
Country Status (3)
| Country | Link |
|---|---|
| BE (2) | BE414753A (en) |
| CH (1) | CH189737A (en) |
| FR (2) | FR804798A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE762495C (en) * | 1943-01-18 | 1953-04-27 | Brown Ag | Gas pressure switch |
| DE1069737B (en) * | 1952-12-23 | 1959-11-26 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE767058C (en) * | 1938-05-27 | 1951-08-16 | Brown Ag | Compressed gas switch |
-
0
- BE BE422328D patent/BE422328A/xx unknown
-
1936
- 1936-03-31 BE BE414753D patent/BE414753A/xx unknown
- 1936-04-01 FR FR804798D patent/FR804798A/en not_active Expired
- 1936-04-04 CH CH189737D patent/CH189737A/en unknown
-
1937
- 1937-07-01 FR FR48585D patent/FR48585E/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE762495C (en) * | 1943-01-18 | 1953-04-27 | Brown Ag | Gas pressure switch |
| DE1069737B (en) * | 1952-12-23 | 1959-11-26 |
Also Published As
| Publication number | Publication date |
|---|---|
| FR804798A (en) | 1936-11-02 |
| FR48585E (en) | 1938-04-05 |
| BE422328A (en) | |
| BE414753A (en) | 1936-04-30 |
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