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EP0335823A1 - Combinaison d'appareils de commutation comprenant un interrupteur de puissance basse tension et un dispositif de commutation à limitation de courant - Google Patents

Combinaison d'appareils de commutation comprenant un interrupteur de puissance basse tension et un dispositif de commutation à limitation de courant Download PDF

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Publication number
EP0335823A1
EP0335823A1 EP89730055A EP89730055A EP0335823A1 EP 0335823 A1 EP0335823 A1 EP 0335823A1 EP 89730055 A EP89730055 A EP 89730055A EP 89730055 A EP89730055 A EP 89730055A EP 0335823 A1 EP0335823 A1 EP 0335823A1
Authority
EP
European Patent Office
Prior art keywords
current
switching device
circuit breaker
limiting
housing
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.)
Withdrawn
Application number
EP89730055A
Other languages
German (de)
English (en)
Inventor
Karl-Heinz Manthe
Bernhard Dr. Pfeiffer
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
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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, Siemens Corp filed Critical Siemens AG
Publication of EP0335823A1 publication Critical patent/EP0335823A1/fr
Withdrawn legal-status Critical Current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
    • H01H9/342—Venting arrangements for arc chutes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H77/10—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening

Definitions

  • the invention relates to a switchgear and controlgear assembly consisting of a low-voltage circuit breaker with a current-limiting contact arrangement and an additional current-limiting switching device that is electrically connected in series with the circuit breaker.
  • a switchgear assembly of this type is known from US-A-4 458 224.
  • the current intensity at which an electrodynamic opening of the contact arrangement of the circuit breaker and the contact arrangement of the current-limiting switching device takes place can be selected to be the same or different. It is essential, however, that the response current of the instantaneous release of the circuit breaker is set lower or at most equal to the response value for the electrodynamic contact opening.
  • the effectiveness of the current-limiting switching device is increased by the invention in that the current-limiting switching device is arranged next to the part of the circuit breaker containing the arc extinguishing device and has a channel for passing the switching gases of the circuit breaker. In this way it is achieved that the switching gases arising in the current-limiting switching device are discharged more quickly than in the known switching device combination mentioned, in which the current-limiting switching device is located at the opposite end of the circuit breaker, namely where the area of the release is located. The switching gases of the circuit breaker and the current-limiting switching device are removed completely independently of one another.
  • the Arrangement according to the invention ensures the flow of the switching gases emerging from the circuit breaker for a gas flow also in the housing of the current-limiting switching device, which causes a faster dissipation of the switching gases generated there. This accelerated removal of the switching gases improves the extinguishing effect of the current-limiting switching device and thus also its switching performance.
  • the arrangement according to the invention also eliminates an additional thermal load on a thermal release due to current heat losses in the current-limiting switching device. This influence requires at least one other adjustment of the thermal release in the known arrangements.
  • the housing of the current-limiting switching device can be designed to be flush with the housing of the circuit breaker.
  • connection devices When installing a current-limiting switching device on a circuit breaker, it is customary to provide connecting pieces on the current-limiting switching device that are suitable in shape and arrangement for direct engagement in the connection devices of the circuit breaker.
  • connection devices Above the connection devices is the outlet opening for the switching gases of the circuit breaker and, according to the embodiment of the invention explained above, the inlet opening in the housing of the current-limiting switching device.
  • the passage openings which are arranged in the housing for a tool provided for operating the connecting devices, can be closed by a cover member. This prevents a pressure loss from occurring when the switching gases pass from the circuit breaker into the current-limiting switching device. At the same time, protection against touching live parts is improved.
  • the channel provided for the passage of the switching gases through the housing of the current-limiting switching device can be formed according to a further embodiment of the invention in that the contact arrangement and the arc-quenching device of the current-limiting switching device are arranged within the associated housing at a distance such that a gas flow essentially can take place without redirection. As a result, the flow losses are kept low.
  • the drive and current rail parts belonging to the current-limiting switching device are enclosed by a hood-like wall part which is shaped to be flow-friendly and which limits the channel within the housing of the current-limiting switching device and that the switching gases of the current-limiting switching device are introduced off the channel.
  • the switching gases of the current-limiting switching device are detected and carried in a manner similar to that of a steam or gas jet pump, without the switching gases used for generating the gas jet of the circuit breaker additionally impinging on the arc extinguishing device of the current-limiting switching device.
  • FIG. 1 shows in a longitudinal section a switchgear and controlgear assembly which consists of a low-voltage circuit breaker in a compact design with an insulating housing and a current-limiting switching device.
  • FIG. 2 shows a top view of the switchgear combination according to FIG. 1, the current-limiting switching device being shown partly in section.
  • the assignment of the view or section planes D, E and F can be seen directly from the comparison with FIG. 1.
  • the switchgear and controlgear assembly 1 shown in FIGS. 1 and 2 consists of a three-pole low-voltage circuit breaker 2 in a compact design with an insulating material housing 3 and also a three-pole current-limiting switching device 4 with its own insulating material housing 5. Both devices are mounted directly adjacent to one another and have the same profile. Therefore, in comparison to the circuit breaker 2, additional space need only be kept free in the longitudinal direction for the switchgear combination 1.
  • the circuit breaker 2 is equipped with a current-limiting contact system.
  • This is a U-shaped fixed contact piece 10 and a contact lever 11 are provided, which can be moved about a hinge pin 12 independently of a drive mechanism designated as a whole by 13 into the open position shown in dashed lines. This happens abruptly when the current forces acting on the contact lever 11 become so high that a compression spring 14 arranged on the back of the contact lever 11 is overcome.
  • the contact lever 11 is provided with a cam 16 against which a rounded cap 15 of a plunger 17 acted upon by the compression spring 14 acts.
  • the normal switching on and off can be carried out manually by means of an actuating handle 20 which actuates a toggle lever mechanism 23 via a drive lever 21 and an over-center spring 22.
  • the toggle lever mechanism is supported on a main pawl 24, which is latched to a locking tab 25 in the position shown in FIG. 1. If the locking tab 25 is released in a known manner by a trigger, the main pawl 24 and thus the toggle lever system 23 loses its support, as a result of which the contact lever 11 automatically reaches its switched-off position.
  • the relative position of the bolt 17 and the nose 16 of the contact lever 11 remains unchanged since these parts are moved together by a switching shaft 18.
  • the drive mechanism 13 is assigned to the middle pole of the circuit breaker 2, in the plane of which the switching device combination is shown in section in FIG. 1.
  • the current-limiting switching device 4 is electrically connected in series with the main current path of the circuit breaker 1.
  • an angled outer end 30 of a busbar 31 is connected to an associated connection device 32 of the circuit breaker 2 for each pole.
  • This opening and the adjacent openings of the two outer poles of the power switches 2 are closed by a closing plate 35 such that the switching gases emerging from an arc chamber 40 of the circuit breaker 2 can only flow via a closing grid 37 and an outlet opening 41 in the direction of the current-limiting switching device 4.
  • the housing 5 has an inlet opening corresponding to the outlet opening 41.
  • the current-limiting switching device 4 contains in its housing 5 a channel 43 extending from the inlet opening 42 for the passage of the arc gases that arise in the arc chamber 40 of the circuit breaker 1 during the extinguishing process.
  • the course of the gas flow is indicated in FIG. 1 by arrows 70, 71, 72 and 73.
  • the flow path of the switching gases emanating from the circuit breaker 2 runs according to the arrows 70 and 71 without any appreciable deflection from the inlet opening 42 to an outlet opening 44 which is arranged at the opposite end of the housing 5 and is covered by a perforated plate 45.
  • An assembly designated as a whole by 46, which comprises switching elements, drive parts and quenching plates, is arranged in the housing 5 to form the channel 43 at a corresponding distance and is also enclosed by a flow-shaped, hood-like wall part 47, around which the circuit breaker 1 starts To oppose gas flow as little resistance as possible.
  • the assembly 46 of the current-limiting switching device 4 has two fixed switching pieces 50 and 51, the switching piece 50 being attached to the busbar 3 already mentioned.
  • the further stationary contact piece 51 is located on another, approximately in the same way as the busbar 31 mirror-symmetrically shaped busbar 52.
  • Movable contact pieces 53 and 54 interacting with these fixed contact pieces are guided on both sides of an insulating partition 55 in a straight line and by a flexible one Current band 56 connected to each other such that they can be moved together as a bridge contact.
  • the position of the parts is shown in dashed lines, which results under the influence of a high, in particular a short-circuit current.
  • the flexible current band 56 expands due to the electrodynamic loop effect and lies against the inner walls of the wall part 47.
  • Each of the two switching points is assigned an arc quenching chamber 57 or 58 formed in a known manner from quenching plates. Both quenching chambers are located near the bottom wall 60 of the housing 5, so that the switching gases emanating from the inside are indicated off the channel 43 in the interior of the housing 5.
  • the housing 5 of the current-limiting switching device 4 comprises three individual pole housings 80, 81 and 82, which each have the same structure, but are provided with separate reference numerals in view of the different drawings.
  • Each of the pole housings consists of two shell-like housing parts 83 and 84, which accommodate the current path parts, connecting devices and the aforementioned channel between them.
  • the pole housing 80 is shown cut in the plane DD corresponding to the right part of FIG. 1.
  • the built-in parts are omitted, so that the shape of the housing parts 83 and 84 is clearly recognizable.
  • the housing part 83 has a projecting wall part which forms the hood-like wall part 47 shown in FIG. 1. Furthermore, the insulating partition 55 is also molded onto the housing part 83. This engages in a groove 85 of the housing part 84, while the hood-like wall part 47 engages in recesses 86 which are formed by projecting wall parts 88. As a result, the wall parts are reliably supported against mechanical forces and the pressure of the switching gases. At the same time this design contributes to the mutual alignment of the housing parts 83 and 84.
  • the pole housing 81 is shown in the sectional plane E-E, specifically with the built-in parts explained with reference to FIG. 1.
  • both legs of the flexible current band 56 can be seen in section, as well as two pairs of coil springs 87, which are provided on both sides of the insulating partition 55.
  • the perforated plate 45 and an external connection device 90 can be seen in section, which can have the same structure as the connection device 32 of the circuit breaker 2.
  • spaces 91 and 92 can be seen, into which the switching gases from the quenching plate stacks 57 and 58 reach, from where they are discharged via the channel 43.
  • the third pole housing 82 is shown in plan view corresponding to the plane F-F shown in FIG. 1.
  • a cover plate 93 can be seen here, which extends over the openings 94 above the connection devices 90.
  • the three adjacent pole housings 80, 81 and 82 can be connected in a suitable manner, for example by connecting pins or bolts which extend through aligned openings 95, which can be arranged in accordance with FIG. 1 in the bottom walls and front walls of the housing parts of the housing 5.
  • the current-limiting switching device 4 is only effective when the switching device combination consisting of the series connection of the circuit breaker 1 and the switching device 4 is subjected to a short-circuit current of a certain level.
  • the contact system of the circuit breaker 1 responds and ignites a switching arc in the quenching chamber 40, as a result of which the flow of switching gases indicated by the arrows 70 and 71 through the channel 43 is brought about.
  • the contacts 50 open, 53 and 51, 54 of the current-limiting switching device 4, whereby switching gases are also released, the flow of which is indicated by the arrows 72 and 73.

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  • Arc-Extinguishing Devices That Are Switches (AREA)
EP89730055A 1988-03-28 1989-03-01 Combinaison d'appareils de commutation comprenant un interrupteur de puissance basse tension et un dispositif de commutation à limitation de courant Withdrawn EP0335823A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883810978 DE3810978A1 (de) 1988-03-28 1988-03-28 Schaltgeraetekombination aus niederspannungs-leistungsschalter und strombegrenzender schalteinrichtung
DE3810978 1988-03-28

Publications (1)

Publication Number Publication Date
EP0335823A1 true EP0335823A1 (fr) 1989-10-04

Family

ID=6351150

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89730055A Withdrawn EP0335823A1 (fr) 1988-03-28 1989-03-01 Combinaison d'appareils de commutation comprenant un interrupteur de puissance basse tension et un dispositif de commutation à limitation de courant

Country Status (2)

Country Link
EP (1) EP0335823A1 (fr)
DE (1) DE3810978A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2704352A1 (fr) * 1993-04-20 1994-10-28 Merlin Gerin Disjoncteur débrochable à plan de fixation du socle débrochable décalé.
FR2811136A1 (fr) * 2000-07-03 2002-01-04 Schneider Electric Ind Sa Module associe a un appareil interrupteur electromagnetique
WO2011098903A1 (fr) * 2010-02-11 2011-08-18 Eaton Corporation Limiteur comprenant plusieurs canaux de gaz et appareil de commutation électrique utilisant ce limiteur
DE102011086308A1 (de) 2011-11-14 2013-05-16 Siemens Aktiengesellschaft Mehrpoliger elektrischer Schalter

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3136921A (en) * 1957-12-10 1964-06-09 Westinghouse Electric Corp Circuit breakers
EP0102867A1 (fr) * 1982-08-06 1984-03-14 Telemecanique Dispositifs modulaires de limitation de courant
EP0212197A2 (fr) * 1985-07-30 1987-03-04 Westinghouse Electric Corporation Disjoncteur avec déflecteur pour l'échappement des gaz d'arc

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3136921A (en) * 1957-12-10 1964-06-09 Westinghouse Electric Corp Circuit breakers
EP0102867A1 (fr) * 1982-08-06 1984-03-14 Telemecanique Dispositifs modulaires de limitation de courant
EP0212197A2 (fr) * 1985-07-30 1987-03-04 Westinghouse Electric Corporation Disjoncteur avec déflecteur pour l'échappement des gaz d'arc

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2704352A1 (fr) * 1993-04-20 1994-10-28 Merlin Gerin Disjoncteur débrochable à plan de fixation du socle débrochable décalé.
FR2811136A1 (fr) * 2000-07-03 2002-01-04 Schneider Electric Ind Sa Module associe a un appareil interrupteur electromagnetique
US6515850B2 (en) 2000-07-03 2003-02-04 Schneider Electric Industries Sa Module combined with an electromagnetic switch appliance
DE10131926B4 (de) * 2000-07-03 2010-06-17 Schneider Electric Industries S.A. Kontrollmodul für Drehstrommotoren
WO2011098903A1 (fr) * 2010-02-11 2011-08-18 Eaton Corporation Limiteur comprenant plusieurs canaux de gaz et appareil de commutation électrique utilisant ce limiteur
DE102011086308A1 (de) 2011-11-14 2013-05-16 Siemens Aktiengesellschaft Mehrpoliger elektrischer Schalter
US9000870B2 (en) 2011-11-14 2015-04-07 Siemens Aktiengesellschaft Multipolar electrical switch
DE102011086308B4 (de) 2011-11-14 2022-03-17 Siemens Aktiengesellschaft Mehrpoliger elektrischer Schalter

Also Published As

Publication number Publication date
DE3810978A1 (de) 1989-10-12

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