EP0281622B1 - Coupe-circuit - Google Patents
Coupe-circuit Download PDFInfo
- Publication number
- EP0281622B1 EP0281622B1 EP19870906398 EP87906398A EP0281622B1 EP 0281622 B1 EP0281622 B1 EP 0281622B1 EP 19870906398 EP19870906398 EP 19870906398 EP 87906398 A EP87906398 A EP 87906398A EP 0281622 B1 EP0281622 B1 EP 0281622B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- contact
- rolls
- circuit breaker
- bars
- distance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
- H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
- H01H1/16—Contacts characterised by the manner in which co-operating contacts engage by abutting by rolling; by wrapping; Roller or ball contacts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
- H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
- H01H1/365—Bridging contacts
Definitions
- the invention relates to a circuit breaker with a number of movable contact members and a corresponding number of fixed contact members, where at least one of the contact members comprises a spring-loaded set of contact rolls with several rolls arranged in such a way as to contact plane side surfaces of two contact bars between the rolls, said rolls being able to glide or roll on said surfaces during the closing and opening of the circuit breaker.
- circuit breakers with contact rolls are known. Circuit breakers for heavy current are normally equipped with several rolls mounted in pairs for each phase so as to split the heavy current into several parallel currents through four, six, or more rolls.
- One of the consequences of such a splitting into several rolls is, however, that the travel of the movable contact member during opening and closing increases with the number of rolls employed.
- the circuit breaker housing and the built-in mechanical parts become correspondingly larger.
- the set of rolls closest to the fixed contact in the open position is exposed to great wear, since this set of rolls alone carries the full current just after opening and just before closing, i.e. the current capacity as well as the breaking capacity of the circuit breaker is in reality limited to the ability of this one set of rolls.
- DE-A-32 23 669 describes an arrangement having two contact rolls for each contact bar.
- the set of contact rolls and the contact bars co-operating with the set are arranged to form a stepped engagement.
- a stepped engagement results in a more or less simultaneous closing or opening of the different contact rolls, i.e. if one roll is in the open position, all rolls are in the open position, so that the travel of the movable contact member is reduced.
- the set of contacts comprises three pairs of rolls the travel may be limited to the travel necessary to open a single pair of rolls. The short travel results in reduced space requirements per phase so that the overall dimensions of the circuit breaker are considerably reduced, although there are e.g. four or more parallel rolls.
- repelling forces are the electromagnetic forces arising when a heavy current is initiated between two contacts brought in touch with each other).
- the circuit breaker is preferably provided with an even number of contact rolls two and two alike, thus forming pairs with one or more stepwise increasing dimensions. Typically four rolls are used, two large ones and two small ones, their absolute size depending on the current the circuit breaker is to be dimensioned to.
- the length of the displacement is almost equal to the distance between the centre axes of two successive contact rolls, said length of the displacement being necessary to transfer the contact bridge from an open position - where the contact rolls and the contact bars are spaced by an air gap large enough to ensure the breaking of a current and to avoid voltage breakdowns - to a closed position - where all contact rolls are in contact with the contact bars. Since the distance the contact bridge has to travel is shorter than previously known, the circuit breaker and thus its housing may be reduced in size. The mechanism transferring the rotational movement of a handle to a translatory displacement of the contact bridge is also simplified.
- a circuit breaker with contact rolls in such a way that all contact rolls in a set of contact rolls have the same diameter, but each pair has a different length and that the two shortest rolls are placed closest to the contact bars, and that the longests rolls are placed furthest away from the contact bars, and that the contact bars on the edges facing the set of contact rolls are stepped with a pitch of each step corresponding to the difference in length of the contact rolls, and that distances between opposite steps are so much longer than the corresponding roll contacts that there is an air gap everywhere between contact rolls and contact bars in the open position.
- the set of contact rolls is displaced by a travel corresponding to the distance between the centre axes of two adjacent rolls in each pair. Care has to be taken, however, that the above air gap is large enough to prevent voltage breakdowns in the circuit breaker.
- the distance between the individual contact rolls measured in the direction perpendicular to the side surfaces of the contact bars decreases stepwise so that the two rolls closest to the contact bars they cooperate with have the largest distance from each other, while the two rolls farthest away have the smallest distance from each other, and that the contact bars correspondingly have a narrow bar part along the edge facing the set of contact rolls, said bar part being of a thickness corresponding to the distance between the farthest pair of contact rolls and increasing in thickness from there stepwise corresponding to the distance between the contact rolls.
- all contact rolls have the same length. The contact surfaces obtained between the contact rolls and the contact bars are larger compared to the aforementioned solution.
- the main object of the invention is also achieved, Means must, however, be provided to prevent the generally spring-loaded contact rolls from being pressed into contact with the bars in the open position of the circuit breaker.
- Means must, however, be provided to prevent the generally spring-loaded contact rolls from being pressed into contact with the bars in the open position of the circuit breaker.
- the division into several pairs of rolls may be extended to include a division into a main contact and a spark contact.
- a division into a main contact and a spark contact With such a division one or two rolls are selected to be spark contacts and this spark contact is always to be closed first and opened last. This is achieved by adjusting the position of the contact rolls or by adjusting the length or thickness of the step(s) in question on the contact bar.
- this embodiment possesses the characteristic part of the present invention, i.e. that the rolls open approximately simultaneously, and the advantages connected thereto, especially the very short travel.
- the smallest or the two smallest contact rolls are chosen as spark contacts, but the largest and thus most robust rolls may also be selected. The choice depends i.a. on the service possibilities available where the circuit breaker is mounted.
- a number of standard sizes are predetermined for the contact rolls, said standard sizes corresponding to typical standard dimensions of circuit breakers.
- a given size of contact rolls may be used as largest contact roll in one circuit breaker for a given current and as a "smaller" contact roll in another circuit breaker for a somewhat heavier current.
- the number of different sizes for contact rolls to be kept in stock is reduced.
- the new circuit breaker is developed for the use in circuit breakers with three or four poles, e.g. of the known type of Figs. 11 and 12, i.e. circuit breakers with several current bars, especially three or four current bars R , S , T and O with circuit breaker functions in the three phases, and possibly also at the O-terminal, as suggested in Figs. 11 and 12.
- the four current bars may be situated in mutually parallel planes, as shown in Fig. 11, or parallel in the same plane, as shown in Fig. 12.
- the contact bridge 60 may be shaped in many different ways and in the drawing it is only suggested with a "dot and dash" line and a double arrow indicating the displacement direction.
- the moving mechanism is not shown but may be realised in many ways as well known to those skilled in the art, and may be a manually initiated circuit breaking effectuated by turning or rocking of a handle, the movement of the switch being transferred to a translatory displacement of the contact bridge 60 via the moving mechanism.
- the circuit breaker may also be provided for automatic opening and closing.
- a set of contact rolls 20 with four rolls 21, 22, 23, 24 is employed, said rolls forming pairs two and two and all of them possessing the same diameter but different lengths L , l , with the two rolls 21, 22 closest to the fixed contacts 25 and 26, said rolls being shorter than the two other rolls and forming a pair.
- the fixed contacts 25 and 26 are provided with a recess for the smallest pair of contact rolls 21, 22 to fit this recess without touching the fixed contacts until the large contact rolls 23, 24 are in contact with the fixed contacts.
- the recess is made exactly as deep as necessary to allow the two contact pairs to come into contact with the fixed contact approximately simultaneously. It is an important advantage of the present invention that all contact rolls connect approximately simultaneously.
- simultaneousness is understood to be within approx. 5 msec, i.e. within the same quarter wave period at 50 Hz.
- simultaneousness is understood to be within approx. 5 msec, i.e. within the same quarter wave period at 50 Hz.
- a wholly exact simultaneousness is impossible and it is thus in the above embodiment impossible to decide immediately which contact roll is the first to make or break the circuit.
- Fig. 3 shows the position of the contacts in the closed position. Comparing Fig. 1 and Fig. 3, it is evident that the travel of the set of contacts from the open position to the closed position corresponds to the length of the arrow of Fig. 1. The travel corresponds on the whole to the travel required to close the contact of a single roll and this applies regardless of the number of rolls.
- the contact rolls shown may be mounted in several, known ways, e.g. as shown in the Danish Patent Specification 142.254, or as illustrated in Figs. 5, 6 and 7 in a retainer 50 with one or more springs F , pressing the contact rolls together in order to ensure a suitable contact pressure when the contact rolls slide in on each side of a corresponding, fixed contact bar.
- a sufficient contact pressure is ensured. It may be advantageous to adjust the force of the spring according to the dimensions of the contact roll in question.
- FIG. 2 and 2 a One example of a possible embodiment of a set of contact rolls is shown in Figs. 2 and 2 a .
- This set of contact rolls comprises an approximately T -shaped piece of iron 27, a spring washer 28 a with a corresponding counterpart 28 b , four contact rolls 21, 22, 23, 24 partially resting against the spring washers 28 a and 28 b and partially held together by the clamps 29 a and 29 b .
- Between the rolls 21, 24 and 22, 23 and their clamps 29 a and 29 b is a spacer 19 with a thickness corresponding to the thickness of the contact bar.
- the parts 28 a , 29 a , 19, 29 b and 28 b are all provided with a longitudinal slot for the passage of the leg of the T -shaped piece of iron 27.
- the central spacer 19 is furthermore provided with extensions 19 a co-operating with means on a displaceable contact bridge provided for this purpose in order to lock the set of contact rolls to the contact bridge with the help of tools provided for this purpose (prior art).
- a set of contact rolls may be arranged in many different ways and the above is just one example of an embodiment.
- Fig. 4 shows a contact set arranged according to the same principle but with four pairs of contact rolls and four steps. As evident from the Figure such a contact type may be provided with more or fewer rolls according to requirements. Also in the case of four pairs of rolls the necessary travel of the contact bridge from the closing to the opening position corresponds only to the travel of one contact set with a single roll or two rolls. In this embodiment it is also possible to choose to let one of the rolls act as a spark contact.
- the rolls have different diameters, as illustrated in Fig. 5.
- the rolls may have the same but also stepped length.
- the rolls 31 and 32 have a small diameter d
- the rolls 33 and 34 have a larger diameter D .
- the fixed contact is comparatively narrow along the outer edge close to the movable contact members so that the small contact rolls 31 and 32 slide in across the close, narrow part 35 of the fixed contact without touching it, whereupon the small contact rolls 31 and 32 are connected with the wide part 37 approximately simultaneously with the narrow part 35, said part being connected to the two large contact rolls 33, 34.
- the smallest contact rolls 31' and 32' are provided to come into contact with the thin parts 35 of the bars, whereas the large contact rolls 33' and 34' are in contact with the thick parts 37 of the bars. Since the electromagnetic forces between the contact rolls arranged in parallel in one pair of contacts, e.g. 31 and 32, are proportional to the length of the contact rolls and inversely proportional to their mutual distance (corresponding to the length and width of the air gap), it may be advantageous to use individual spring loads for each pair of contact rolls, as suggested in Fig. 6, or for each contact roll, as suggested in Fig. 5.
- the thick parts 37 of the bars may be coated with a more resistant material thus making the bars resistant to spark formation.
- the rolls 33' and 34' are equally made of a correspondingly spark-proof material.
- Figs. 7 and 8 a variation is shown where the contact rolls used have the same diameter but are mounted with different mutual distances.
- the rolls 41 and 42 possess a larger distance from each other than the rolls 43 and 44 and the correspondingly fixed contact 46 is provided with a set of steps so that the four contact rolls open simultaneously when they are drawn away from the fixed contact.
- the retainer 50 is shaped as to maintain a predetermined, minimum distance between the contact rolls of each pair of contact rolls in the open position. It is evident for those skilled in the art that this is realized in many different ways.
- Fig. 9 showing a section through a retainer, where there is provided a guidance shaped like an elongated hole 51 for the contact rolls as well as support surfaces and possibly guidances for pressure springs pressing the rolls against each other.
- the invention may be varied in many ways. It is thus within the scope of the invention to vary one or more of the parameters, the length of the roll, diameter, distance as well as spring pressure within the same set of contact rolls.
Landscapes
- Contacts (AREA)
- Breakers (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Claims (8)
- Coupe-circuit muni d'un certain nombre d'éléments de contact mobiles (20) et d'un nombre correspondant d'éléments de contact fixes (25, 26) où au moins l'un des éléments de contact comprend une série montée sur ressort de galets de contact (20) avec plusieurs galets (21, 22, 23, 24) disposés de façon à venir en contact avec les surfaces latérales planes de deux barrettes de contact (25, 26) entre les galets, ces galets pouvant coulisser ou rouler sur les surfaces pendant la fermeture et l'ouverture du coupe-circuit, caractérisé en ce que chacune des barrettes de contact (25, 26) présente une configuration en gradins, chaque gradin ayant au moins une surface de contact pouvant coopérer avec un galet respectif de la série de galets de contact (20).
- Coupe-circuit selon la revendication 1 et du type dans lequel les éléments de contact mobiles sont montés sur un pontet de contact déplaçable en translation (60), caractérisé en ce que la longueur du déplacement est pratiquement égale à la distance entre les axes centraux de deux galets de contact successifs, la longueur de déplacement étant nécessaire pour transférer le pontet de contact à partir d'une position ouverte où les galets de contact et les barrettes de contact sont espacés par un entrefer suffisamment grand pour assurer la rupture d'un courant et éviter des pannes de tension - sur une position fermée - lorsque tous les galets de contact sont en contact avec les barrettes de contact.
- Coupe-circuit selon la revendication 1 ou 2, caractérisé en ce que tous les galets de contact (21, 22, 23, 24) dans une série de galets de contact (20) ont le même diamètre, mais chaque paire possède une longueur différente (L, l) et en ce que les deux galets les plus courts sont placés le plus près des barrettes de contact (25, 26) et en ce que les galets les plus longs sont placés à la distance la plus éloignée des barrettes de contact (25, 26) et en ce que les barrettes de contact sur les bords en regard de la série de galets de contact présentent des gradins avec un pas pour chaque gradin correspondant à la différence de longueur des galets de contact et en ce que les distances entre des gradins opposés sont beaucoup plus grandes que les contacts des galets correspondants en ce qu'il est prévu un entrefer entre les galets de contact et les barrettes de contact dans la position ouverte.
- Coupe-circuit selon la revendication 1 ou 2, caractérisé en ce que la distance entre les galets de contact individuels mesurée dans la direction perpendiculaire aux surfaces latérales des barrettes de contact diminue graduellement de sorte que les deux galets (31, 32 et 41, 42) le plus près des barrettes de contact (37, 46) coopèrent, ont leur distance la plus grande l'une de l'autre tandis que les deux galets les plus éloignés ont la distance la plus courte l'une de l'autre et en ce que les barrettes de contact ont de façon correspondante une partie de barrette étroite (35, 45) le long du bord en regard de la série de galets de contact, la partie de barrette étant d'une épaisseur correspondant à la distance entre la paire la plus éloignée de galets de contact (33, 34, 43, 44) et augmentant de largeur à partir de là graduellement de façon correspondante à la distance entre les galets de contact.
- Coupe-circuit selon la revendication 4, caractérisé en ce que les diamètres des galets de contact diminuent graduellement par paires.
- Coupe-circuit selon la revendication 5, caractérisé en ce que tous les galets de contact ont la même longueur.
- Coupe-circuit selon les revendication 1-6, caractérisé en ce que l'engagement par gradins est complété par une contrainte par ressort à gradins par paire ou individuellement pour chaque galet ou paire de galets.
- Coupe-circuit selon l'une quelconque des revendications 1-7, caractérisé en ce que la série de contacts est divisée en au moins un contact principal et au moins un contact d'étincelles et en ce que le contact d'étincelles et/ou la partie correspondante de la barrette de contact est réalisée soit en un matériau particulièrement résistant aux brûlures après la formation d'étincelles ou encore sa surface est traitée avec un revêtement résistant.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87906398T ATE97764T1 (de) | 1986-09-19 | 1987-09-04 | Leistungsschalter. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK4502/86 | 1986-09-19 | ||
DK450286A DK158422C (da) | 1986-09-19 | 1986-09-19 | Afbryder |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0281622A1 EP0281622A1 (fr) | 1988-09-14 |
EP0281622B1 true EP0281622B1 (fr) | 1993-11-24 |
Family
ID=8134121
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19870906398 Expired - Lifetime EP0281622B1 (fr) | 1986-09-19 | 1987-09-04 | Coupe-circuit |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0281622B1 (fr) |
AU (1) | AU603616B2 (fr) |
DE (1) | DE3788277T2 (fr) |
DK (1) | DK158422C (fr) |
ES (1) | ES2005325A6 (fr) |
FI (1) | FI88084C (fr) |
GR (1) | GR871434B (fr) |
WO (1) | WO1988002178A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL1015585C2 (nl) * | 2000-07-03 | 2002-01-04 | Holec Holland Nv | Schakelaar met hulp-en hoofdcontacten. |
NL1015584C2 (nl) * | 2000-07-03 | 2002-01-04 | Holec Holland Nv | Beweegbaar contactenstel voor een schakelaar met een vast contactenstel. |
EP3211648B1 (fr) * | 2016-02-29 | 2019-01-23 | Wöhner GmbH & Co. KG Elektrotechnische Systeme | Systeme de commutation electrique |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1034000A (en) * | 1911-04-22 | 1912-07-30 | Walter H Durfee | Circuit-controller. |
DE3223669C2 (de) * | 1982-06-24 | 1985-01-10 | Siemens AG, 1000 Berlin und 8000 München | Kontaktanordnung für elektrische Schalter |
-
1986
- 1986-09-19 DK DK450286A patent/DK158422C/da not_active IP Right Cessation
-
1987
- 1987-09-04 WO PCT/DK1987/000108 patent/WO1988002178A1/fr active IP Right Grant
- 1987-09-04 DE DE87906398T patent/DE3788277T2/de not_active Expired - Fee Related
- 1987-09-04 EP EP19870906398 patent/EP0281622B1/fr not_active Expired - Lifetime
- 1987-09-04 AU AU80735/87A patent/AU603616B2/en not_active Ceased
- 1987-09-15 ES ES8702659A patent/ES2005325A6/es not_active Expired
- 1987-09-16 GR GR871434A patent/GR871434B/el unknown
-
1988
- 1988-05-18 FI FI882341A patent/FI88084C/fi not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
AU8073587A (en) | 1988-04-07 |
GR871434B (en) | 1988-01-22 |
DE3788277D1 (de) | 1994-01-05 |
FI882341A (fi) | 1988-05-18 |
AU603616B2 (en) | 1990-11-22 |
DE3788277T2 (de) | 1994-03-31 |
FI882341A0 (fi) | 1988-05-18 |
DK450286A (da) | 1988-03-20 |
DK450286D0 (da) | 1986-09-19 |
DK158422C (da) | 1990-10-22 |
EP0281622A1 (fr) | 1988-09-14 |
FI88084C (fi) | 1993-03-25 |
FI88084B (fi) | 1992-12-15 |
WO1988002178A1 (fr) | 1988-03-24 |
ES2005325A6 (es) | 1989-03-01 |
DK158422B (da) | 1990-05-14 |
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