EP0489986B1 - Interrupteur de puissance à basse tension avec un moyen de liaison isolant et un écran isolant - Google Patents

Interrupteur de puissance à basse tension avec un moyen de liaison isolant et un écran isolant Download PDF

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Publication number
EP0489986B1
EP0489986B1 EP19900250313 EP90250313A EP0489986B1 EP 0489986 B1 EP0489986 B1 EP 0489986B1 EP 19900250313 EP19900250313 EP 19900250313 EP 90250313 A EP90250313 A EP 90250313A EP 0489986 B1 EP0489986 B1 EP 0489986B1
Authority
EP
European Patent Office
Prior art keywords
insulating
insulating panel
power switch
low voltage
voltage power
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
Application number
EP19900250313
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German (de)
English (en)
Other versions
EP0489986A1 (fr
Inventor
Johannes Dipl.-Ing. Banghard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to DE59008678T priority Critical patent/DE59008678D1/de
Priority to EP19900250313 priority patent/EP0489986B1/fr
Priority to JP35036291A priority patent/JPH04315714A/ja
Publication of EP0489986A1 publication Critical patent/EP0489986A1/fr
Application granted granted Critical
Publication of EP0489986B1 publication Critical patent/EP0489986B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H2009/305—Means for extinguishing or preventing arc between current-carrying parts including means for screening for arc gases as protection of mechanism against hot arc gases or for keeping arc gases in the arc chamber

Definitions

  • the invention relates to a low-voltage circuit breaker with a contact arrangement comprising a fixed contact unit and a movable contact unit interacting with it, and with a drive device having a selector shaft, wherein a crank arm fastened to the selector shaft and the movable contact unit are articulated to one another by at least one insulating coupling element and an insulating shield sitting on the coupling element in the switched-off state of the circuit breaker covers an opening for the coupling elements in a first insulating plate.
  • a circuit breaker of this type is known from DE-C-29 05 854.
  • the insulating shield is designed as a fixed component of the coupling element, while the first insulating wall is part of a shell-like insulating component that separates the drive device from the contact arrangement.
  • the interaction between the insulating shield and the insulating plate results in a seal between the switching chamber of the circuit breaker and the space accommodating the drive device, in order to prevent ionized gases from escaping from the switching chamber during the switching process and in this way to prevent electrical flashovers.
  • a similarly acting arrangement according to DE-A-35 40 655 contains, instead of a solid insulating screen formed in one piece with the coupling member, a relatively thin, plate-shaped insulating screen which has a lower mass than a one-piece molded insulating screen and, because of its lower mass, reduces the energy requirement when switching .
  • the insulating screen lies against its edges engaging or delimiting strips or stop surfaces and brings about the desired sealing in this position.
  • the shielding effect of the known arrangements consisting of insulating shield and insulating plate is no longer sufficient when a circuit breaker is to be used at a nominal voltage which is above the z. At present, the usual value of a maximum of 660 V. Proceeding from this, the object of the invention is to make circuit breakers of the type mentioned usable for a significantly higher voltage level, for example 1000 V, in principle with the same structure and without increasing their dimensions.
  • the invention solves this problem starting from a circuit breaker of the type mentioned in that a second insulating plate is arranged at a distance from the first insulating plate which corresponds at most to the path of the coupling element during a switching operation, which second insulating plate also has openings for the passage of the coupling element and which is on is the side of the insulating shield that faces away from the first insulating plate.
  • the length of the coupling element remains unchanged compared to the known circuit breaker.
  • the specified dimensioning - at a distance corresponding at most to the path of the coupling element - is to be understood such that a technically required dimensional tolerance is taken into account in the distance between the insulating plates.
  • Both the sealing effect described above as well the dimensioning of the length of the coupling element can, according to a further development of the invention, be influenced in a favorable manner in that the first insulating plate is arranged to be movable and can be carried along by the insulating screen from a position relatively close to the second insulating plate when the switching-off process is carried out. In this way, a labyrinthine arrangement is created with a reduced overall length requirement.
  • a further improvement and simplification of the circuit breaker can be contributed in that the first insulating plate is designed to be flexible and extends from a base plate located below the contact arrangement substantially over the entire height of the contact arrangement and an arc quenching chamber located above the contact arrangement.
  • the flexibility eliminates the need to adapt the insulating plate more or less exactly to the contour of the dividing line between the switching chamber and the space accommodating the drive device.
  • the extension to the arc quenching chamber also creates an uninterrupted insulation inside the circuit breaker with a correspondingly high level of security against flashovers.
  • the second insulating plate can also be designed to be flexible. In this way, it is possible to arrange the two insulating plates at a relatively small distance from one another on both sides of the insulating shield seated on the coupling member, and thereby for an arrangement with a particularly high flow resistance to care. During the switching operations, both insulating plates and the insulating shield take part in the movement in whole or in part.
  • the second insulating plate can have a lower height than the first insulating plate.
  • the first and the second insulating plate can have a width corresponding to the entire width of the contact arrangements have a multi-pole circuit breaker and can be provided with openings for all existing coupling links.
  • the second insulating plate can be provided on one edge with projections which articulate engage in openings in the first insulating plate. This ensures cohesion and relative mobility of the insulating plates in the switching operations in a simple manner.
  • the first insulating plate can at least locally carry a layer of an adhesive adhesive near its upper edge.
  • Insulation plates made of synthetic resin-bonded organic or inorganic fibers or fabric webs have proven particularly useful, the thickness of the insulation plates being of the order of 1 mm. Depending on the size of the circuit breaker and the insulating plates, thicknesses between about 0.3 and 2 mm can be considered.
  • FIG. 1 shows in section a switching pole of a low-voltage circuit breaker with the associated drive device and an arrangement for sealing between the switching chamber and the drive device.
  • FIG. 2 shows a first insulating plate
  • FIG. 3 represents a second insulating plate
  • FIGS. 4, 5 and 6 schematically show the relative positions between the insulating shield seated on a coupling member and a first and a second insulating plate.
  • 4 shows an arrangement with stationary insulating plates.
  • a stationary and a movable insulating plate are provided in FIG. 5, while the example according to FIG. 6 has two movable insulating plates.
  • circuit breaker 1 shows a section of a pole of a multi-pole low-voltage circuit breaker of a type such as is described in more detail, for example, in DE-A-35 04 423 or EP-B-0 191 719. Therefore, only the details of the circuit breaker 1 shown for understanding the invention are explained below.
  • a housing 2 there are three contact arrangements, designated as a whole by 3, each in a parallel arrangement comprise a fixed contact unit 4 and a movable contact unit 5.
  • the term “contact unit” in the present context means a multi-part assembly which, in the case of the contact unit 4, comprises a fixed, busbar-like support, at least one main contact attached to it, an arcing horn and, if required, at least one burn-off contact.
  • the movable contact unit 5 has a movable contact lever with contact parts arranged in a manner analogous to that of the contact unit 4 and a support 7 receiving the contact unit 5 and pivotable about a pivot bearing 6.
  • a flexible current band 11 is a movable conductive connection between the contact unit 5 and a fixed clamping device 10 intended.
  • the contact units 4 and 5 are connected to outer connecting rails 12 and 13, respectively, which extend at the rear of the housing 2 of the circuit breaker 1 approximately parallel to the rear wall upwards and downwards.
  • An example of a suitable contact arrangement can be found in EP-B-0 191 719.
  • a spring storage unit 14 which may correspond approximately to the construction as described in DE-A-35 42 746.
  • the spring-loaded unit 14 interacts with a drive device 15, which comprises articulated toggle levers 16, 17 and 18, which are shown in FIG. 1 in a bent position corresponding to the illustrated switch-off position of the contact arrangement 3.
  • a latching device which comprises a release shaft 20, a latch lever 21 and a support lever 22, is shown in the latched state.
  • the support lever 22 engages on a hinge pin 23 which connects the toggle levers 17 and 18 to one another in an articulated manner.
  • the contact arrangement 3 can be moved into the switch-on position by releasing the tensioned energy storage unit 14, which is shown in FIG. 1 of EP-B-0 191 719.
  • the toggle lever arrangement described above actuates a switching shaft 24 which is common to all poles of the circuit breaker 1 arranged parallel to one another.
  • Crank arms 25 seated on the control shaft 24 are connected in an articulated manner to at least one insulating coupling member 26 which is provided for each pole of the circuit breaker 1 and which in turn is connected in an articulated manner to the carrier 7 of the associated movable contact unit 5.
  • two or more parallel coupling links 26 can be provided, depending on the dimensions of the carrier 7 and how large the power requirement is when switching on.
  • the coupling elements 26 thus form the electrical insulation between the movable contact unit 5 and its support 7 and between the drive device 15 which is at ground potential.
  • the normal operating voltages which occur in low-voltage circuit breakers only require relatively short insulating distances. However, if the insulating sections are stressed with ionized gases or metal vapor or both media, there is a risk of a flashover between the live and earthed components. Obviously, a simple way to avoid the above-mentioned rollovers would be to dimension the length of the coupling links 26 accordingly. In this way, however, the size of the circuit breaker 1 is undesirably changed because it is then necessary to increase the distance between the contact arrangement 3 and the drive device 15. The following describes how an arrangement of insulating plates in the area of the isolating coupling element 26 avoids an enlargement of the circuit breaker 1 and makes it usable for use with the highest operating voltages of approximately 1000 V currently occurring in low-voltage networks.
  • the new arrangement in the area of the coupling element 26 comprises an insulating screen 30 which is seated on the coupling element 26 and which is made of can consist of a relatively thin insulating material.
  • the insulating screen 30 does not require any special attachment to the coupling member 26, provided the insulating screen 30 is provided with a cutout which is adapted to the cross-sectional shape of the coupling member 26 in such a way that no gaps remain and sufficient adhesion is provided by friction.
  • the insulating screen 30 it is possible to arrange the insulating screen 30 to be displaceable to a limited extent in the longitudinal direction of the coupling member 26 by attaching corresponding stop surfaces to the coupling member 26.
  • a first insulating plate 31 and a second insulating plate 32 interact with the insulating screen 30, the insulating screen 30 being located between the insulating plates 31 and 32.
  • the insulating plate 31 closer to the drive device 15 is shown in FIG. 2 in a flat state, which it assumes as an individual part after its manufacture.
  • the insulating plate 31 consists of a relatively thin and elastically flexible material, such as is used as an insulating material in electrical engineering. For example, 0.5 mm thick hard tissue is suitable.
  • the width of the insulating plate 31 is dimensioned such that it extends over the entire width of the poles of the circuit breaker 1 and has two through openings 33 for the coupling elements 26 (FIG. 1) belonging to one pole for each of the poles. A total of six through openings 33 are thus present.
  • the width of the passage openings 33 is adapted with a relatively small excess of the width of the coupling links 26, since a lateral movement of the coupling links 26 when switching is not to be expected.
  • the height of the passage openings 33 dimensioned larger than the height of the coupling links 26 in order to take into account the pivoting of the coupling links due to their connection to the crank arm 25 and the carrier 7 and to the contact unit 5.
  • the height of the insulating plate 31 corresponds approximately to the height of the contact arrangement 3, including an arc quenching chamber 41 located above the contact arrangement 3 40 shown.
  • the lower edge of the insulating plate 31 rests on the base plate 40 and lies against an insulating web 42 which also extends across the width of all the poles of the circuit breaker 1.
  • the upper edge 35 of the insulating plate 31 ends approximately at the upper leg 43 of an angled sheet metal part belonging to the structure of the circuit breaker 1. Near the top edge 35, two narrow and parallel self-adhesive adhesive strips 36 are provided to facilitate assembly. Below the through openings 33 and relatively close to the lower edge 34, two smaller through openings 37 are provided, which are provided for cooperation with the further insulating plate 32 shown in FIG. 3.
  • the insulating plate 32 is also provided with through openings 33, the size and arrangement of which are selected in the same way as for the insulating plate 31.
  • the insulating plate 32 On its lower edge, the insulating plate 32 has, in a symmetrical arrangement, two laterally extending tongues 38 which are provided for engaging in the corresponding passage opening 37 of the insulating plate 31.
  • the intervention can be accomplished in a simple manner in that the insulating plate 32 is bent around its axis of symmetry, shown in dash-dotted lines in FIG. 3, until the ends of the tongues 38 can be inserted through the passage openings 37. After the insulation plate 32 has relaxed, the two insulation plates are pivotally connected to one another within certain limits in this way.
  • the insulating plate also has 32 a lower height than the insulating plate 31.
  • the upper edge 39 of the insulating plate 32 bears against a shoulder 44 at the lower edge of the arc quenching chamber 41.
  • the elastic bending of the insulating plate 32 results in the upper edge 39 abutting the shoulder 44 in such a way that an adequate seal is ensured.
  • strips made of insulating material can be provided in the area of the outer poles of the circuit breaker for the insulation plate 31 to rest in the open position, as is known per se.
  • FIGS. 4, 5 and 6 Examples of different arrangements of the insulating plates are explained below with reference to FIGS. 4, 5 and 6.
  • a simple linear movement of the coupling member 26 shown broken off is assumed, although this also performs a pivoting movement in addition to an axial movement due to the connection with the drive device 15 shown in FIG. 1.
  • the direction of movement when switching on and when switching off is marked with an arrow, with "1" denoting the direction when switching on and "0" the direction when switching off.
  • the insulating screen 30 is either permanently connected to the coupling member 26 or is in any case connected to such liability that during the switching movements there is no or only an insignificant relative movement to the coupling member.
  • Insulating plates 31 and 32 and the insulating shield are each shown with solid lines in the switched-on position and with dash-dotted lines in the switched-off position. Connections with the movable contact unit 5 and with the drive device 15, between which the coupling member 26 is arranged, are also indicated by dash-dotted lines.
  • the insulating plates 31 and 32 are arranged at a fixed distance from one another, which is approximately the stroke of the coupling member 26 during a switching operation, i. H. from the transition from the closed position of the contact units 4 and 5 to the open position according to FIG. 1. Therefore, the insulating screen 30 in FIG. 4 is initially close to the insulating plate 32.
  • the flow of the switching gases is further impeded by the relatively small excess of the through openings 33 in relation to the coupling member 26.
  • the insulating screen 30 finally reaches the end position shown in dash-dotted lines in FIG. 4, in which the insulating screen 30 either lies directly against the insulating plate 31 or faces it at a short distance, the through opening is 33 of the insulating plate 31 also practically closed.
  • the arrangement shown in FIG. 4 thus has the property that a very effective partitioning between the switching chamber and the drive device 15 is ensured both in the switched-on position and in the switched-off position of the contact arrangement.
  • FIG. 5 Another embodiment is shown in FIG. 5.
  • the insulating plate 32 essentially maintains its position during the switching process, while the insulating plate 31 is carried along by the insulating screen 30 into the switch-off position shown in broken lines.
  • the closure of the passage opening 33 in the insulating plate 31 is retained by the insulating screen 30 during the entire movement sequence.
  • both insulating walls 31 and 32 can be moved and are also moved by the insulating screen 30 during the switching process. Accordingly, the state when the contact arrangement 3 is closed and the switch-off position according to FIG. 1 is indicated with solid lines.
  • the sealing effect is particularly pronounced in this case because the insulating screen 30 covers the through openings 33 in both insulating plates 31 and 32 during the entire switching process and thereby largely closes them.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Claims (9)

  1. Disjoncteur basse tension (1) comportant une unité de contact fixe (4) et un dispositif de contact (3) qui comprend une unité de contact mobile (5) coopérant avec l'unité de contact fixe, ainsi qu'un dispositif d'entraînement (15) qui possède un arbre de commutation (24), et dans lequel un bras de manivelle (25) fixé à l'arbre de commutation (24), et l'unité de contact mobile (5) sont reliés entre eux de façon articulée par au moins un organe d'accouplement isolant (26), et un blindage isolant (30), disposé sur le circuit de couplage (26), masque une ouverture (33) pour des circuits de couplage dans la première plaque isolante (31), lorsque le disjoncteur (1) est dans l'état ouvert, caractérisé par le fait qu'à une distance de la première plaque isolante (31), qui correspond au maximum à la course de déplacement de l'organe de couplage (26) lors d'une opération de coupure, est disposée une seconde plaque isolante (32) qui possède également des ouvertures (33) pour le passage de l'organe de couplage (26) et est située sur le côté du blindage isolant (30), qui est tourné à l'opposé de la première plaque isolante (31).
  2. Disjoncteur de puissance basse tension suivant la revendication 1, caractérisé par le fait que la première plaque isolante (31) est montée mobile et peut être entraînée simultanément par le blindage isolant (30), lors de l'opération de coupure, à partir d'une position relativement proche de la seconde plaque isolante (32).
  3. Disjoncteur de puissance basse tension suivant la revendication 1 ou 2, caractérisé par le fait que la première plaque isolante (31) est réalisée de manière à être flexible et s'étend, à partir d'une plaque de fond isolante (40), située au-dessous du dispositif de contact (3), sensiblement sur toute la hauteur du dispositif de contact (3) et d'une chambre d'extinction d'arc électrique (41) située au-dessus du dispositif de contact (3).
  4. Disjoncteur de puissance basse tension suivant l'une des revendications précédentes, caractérisé par le fait que la seconde plaque isolante (32) est également réalisée de manière à être flexible.
  5. Disjoncteur de puissance basse tension suivant la revendication 3 ou 4, caractérisé par le fait que la seconde plaque isolante (32) s'étend, à partir d'une plaque de fond isolante (40) située au-dessous du dispositif de contact (3), approximativement jusqu'au bord inférieur de la chambre d'extinction d'arc électrique (41).
  6. Disjoncteur de puissance basse tension suivant l'une des revendications précédentes, caractérisé par le fait que la première plaque isolante (31) et la seconde plaque isolante (32) possèdent une largeur qui correspond à la largeur totale des dispositifs de contact (3) d'un disjoncteur multipolaire (1) et comporte des ouvertures de passage (33) pour tous les organes de couplage présents (26).
  7. Disjoncteur de puissance basse tension suivant l'une des revendications précédentes, caractérisé par le fait qu'au niveau de l'un de ses bords, la seconde plaque isolante (32) s'engage au moyen de languettes (38), d'une manière articulée, dans des ouvertures (37) de la première plaque isolante (31).
  8. Disjoncteur de puissance basse tension suivant la revendication 3, caractérisé par le fait que la première plaque isolante (31) porte, à proximité de son bord supérieur (35), au moins par endroits, une couche (36) d'un adhésif.
  9. Disjoncteur de puissance basse tension suivant l'une des revendications précédentes, caractérisé par le fait que les plaques isolantes (31, 32) sont constituées par des fibres organiques ou minérales ou des bandes de tissus, reliées par une résine synthétique, et possède une épaisseur de l'ordre de 1 mm.
EP19900250313 1990-12-14 1990-12-14 Interrupteur de puissance à basse tension avec un moyen de liaison isolant et un écran isolant Expired - Lifetime EP0489986B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE59008678T DE59008678D1 (de) 1990-12-14 1990-12-14 Niederspannungs-Leistungsschalter mit einem isolierenden Koppelglied und einem Isolierschirm.
EP19900250313 EP0489986B1 (fr) 1990-12-14 1990-12-14 Interrupteur de puissance à basse tension avec un moyen de liaison isolant et un écran isolant
JP35036291A JPH04315714A (ja) 1990-12-14 1991-12-09 低電圧遮断器

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19900250313 EP0489986B1 (fr) 1990-12-14 1990-12-14 Interrupteur de puissance à basse tension avec un moyen de liaison isolant et un écran isolant

Publications (2)

Publication Number Publication Date
EP0489986A1 EP0489986A1 (fr) 1992-06-17
EP0489986B1 true EP0489986B1 (fr) 1995-03-08

Family

ID=8205240

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900250313 Expired - Lifetime EP0489986B1 (fr) 1990-12-14 1990-12-14 Interrupteur de puissance à basse tension avec un moyen de liaison isolant et un écran isolant

Country Status (3)

Country Link
EP (1) EP0489986B1 (fr)
JP (1) JPH04315714A (fr)
DE (1) DE59008678D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19910033C1 (de) * 1999-03-08 2000-11-09 Moeller Gmbh Mehrpoliger Leistungsschalter
US8415580B2 (en) * 2011-06-30 2013-04-09 Eaton Corporation Carrier link insulator for a circuit breaker

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB763227A (en) * 1954-07-31 1956-12-12 Crabtree & Co Ltd J A Improvements in electric switches or circuit breakers
US3053958A (en) * 1959-11-19 1962-09-11 Ite Circuit Breaker Ltd Circuit breaker handle baffle
GB2042263B (en) * 1979-02-08 1983-10-19 Terasaki Denki Sangyo Kk Circuit interrupters
DE3540655A1 (de) * 1985-11-13 1987-05-14 Siemens Ag Kontaktanordnung fuer niederspannungs-leistungsschalter mit einem bewegbaren isolierkoerper

Also Published As

Publication number Publication date
EP0489986A1 (fr) 1992-06-17
DE59008678D1 (de) 1995-04-13
JPH04315714A (ja) 1992-11-06

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