EP0614207A2 - Appareil de commutation avec un déclencheur thermique et magnétique - Google Patents

Appareil de commutation avec un déclencheur thermique et magnétique Download PDF

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Publication number
EP0614207A2
EP0614207A2 EP94102533A EP94102533A EP0614207A2 EP 0614207 A2 EP0614207 A2 EP 0614207A2 EP 94102533 A EP94102533 A EP 94102533A EP 94102533 A EP94102533 A EP 94102533A EP 0614207 A2 EP0614207 A2 EP 0614207A2
Authority
EP
European Patent Office
Prior art keywords
arc
switching device
thermal
resistance wire
quenching
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Withdrawn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
EP94102533A
Other languages
German (de)
English (en)
Other versions
EP0614207A3 (fr
Inventor
Heinz-Erich Popa
Joachim Becker
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.)
ABB Patent GmbH
Original Assignee
ABB Patent GmbH
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 ABB Patent GmbH filed Critical ABB Patent GmbH
Publication of EP0614207A2 publication Critical patent/EP0614207A2/fr
Publication of EP0614207A3 publication Critical patent/EP0614207A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/121—Protection of release mechanisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02—Details
    • H01H73/18—Means for extinguishing or suppressing arc

Definitions

  • the invention relates to a switching device with a thermal and a magnetic release according to the preamble of claim 1.
  • a blow loop is known for accelerating the course of an arc drawn during a switching operation from the contact points into the arc quenching chamber and into the arc quenching plate packet located therein to provide.
  • AEG-Mitteilungen, 1964 issues 3 to 4, "high-performance installation self-switch in narrow construction" it is shown to arrange the blow loop behind the arc rail, that is on its side opposite to the quenching chamber. This blow loop is not in the circuit when the switch is closed, but is only switched on in the current path of the circuit breaker when the arc commutates on the track and only then becomes effective.
  • the blow loop is also connected to the arc rail and arranged so that the current always flows through it and is therefore always effective, which is particularly advantageous at the moment the contact is opened.
  • an electrical switching device which has become known which has a U-shaped blow loop which essentially comprises the contact point and the arc-quenching plate package.
  • the arrangement of the blow pipe drives the arc into the arc quenching plate package, but it is not stabilized there by the loop.
  • the object of the invention is to provide an electrical switching device, in particular a miniature circuit breaker, of the type mentioned in the introduction, in which, on the one hand, a reduction in the power loss and, on the other hand, a reduction in the variety of variants is made possible.
  • a resistance wire is thus connected in parallel to the thermal and / or magnetic trigger, which forms the blow loop in the area of the arcing chamber.
  • the current flowing through the switch is divided into a current flow through the triggers and a current flow through the resistance wire, so that a reduced impact energy is effective in the event of a short circuit.
  • the resistance wire is designed as a blow loop, which is arranged in the area of the quenching chamber, a blow effect on the arc is generated directly at the first contact opening. In particular, this is achieved in that the contact area, that is, the area in which the fixed and movable contact piece is located, even during the switching-off process, and in addition the entire prechamber area is covered by the blow loop in any case.
  • the blow loop has a section that extends transversely to the extent of the arc quenching plate and approximately in the area of the center of the arc quenching plate package according to claim 4, a part of the arc quenching plate package is covered by the closed blow loop, whereby the arc after entering the quenching chamber is stabilized.
  • the operation of the arrangement is such that a magnetic field is generated by the blow loop, which is perpendicular to the arc. According to the Lorenz law, a force acts on the arc that accelerates it towards the quenching chamber.
  • the resistance wire is according to the invention with one end the fixed contact piece and at the other end to the thermal release, generally connected to the terminal end of the release in general, and arranged laterally next to the arcing chamber.
  • the resistance wire is a normal copper wire.
  • the dimensioning of the resistance value of the resistance wire is preferably carried out in accordance with the characterizing features of claim 6 in such a way that the ratio of the current flowing through the resistor to the current flowing through the trigger (s) is approximately 0.6.
  • the particular advantage of the invention is that the parallel connection reduces the power loss. At the same time, due to the resistance at high nominal currents, i.e. at 80 amps and 100 amps, the triggers of devices that are designed for 50 amps and 63 amps can be used. This reduces the variety of variants, which ultimately makes miniature circuit breakers less expensive at high nominal currents, since cost savings in production and warehousing are made possible.
  • a circuit breaker 10 is housed in a housing 11, of which only a housing part is visible; the other housing part is a kind of cover part and not shown in the figure.
  • the switching device 10 has approximately a T-shape with a base 12 and an upper part 13. In the area of the base 12, that is to say in the area of the fastening level, the switching device has a recess 14, the side walls of which have a fixed nose 15 and a movable nose 16, so that the switching device can be snapped onto a hat rail 17 shown in dashed lines.
  • an arc guide 20 connects, which has approximately an L-shape, a region 21 being provided between the legs 22 and 23, which extends at an angle to the two legs 22 and 23, so that the arc guide rail 20 has a smooth transition between the two legs 22 and 23.
  • the leg 22 connects to the connecting terminal 18 and the leg 23 covers an arc-quenching plate packet 24, which is constructed from a plurality of arc-quenching plates 25 in a manner known per se.
  • the other end of the stack of arc quenchers 25 is formed by a further arc guide rail 26, the further arc guide rail 26 running parallel to the leg 23.
  • the arc quenching plate pack 24 is located between the further arc guide rail 26 and the leg 23.
  • the further arc guide rail 26 is connected to a leg 27 of a magnetic yoke 28, the further arc guide rail 26 having a nose-shaped bulge 29 in the immediate vicinity of the magnetic yoke 28.
  • a fixed contact piece 30 which interacts with a movable contact piece 31 which is attached to a contact lever 33 which is rotatably mounted at 32.
  • the contact lever 33 moves clockwise around the axis 32 and reaches the dashed position 33 'in the switch-off position.
  • the magnet yoke 28 is part of an electromagnet system 34 with a coil 35 and a magnet armature 36 surrounded by the coil 35, which is shown in broken lines in the figure.
  • the magnet armature 36 on the one hand actuates the contact lever 33, in which it strikes the contact lever when a short-circuit current occurs and brings it into the dash-dotted position 33 '; furthermore, the magnet armature 36 actuates a lever (not shown in more detail) with which it acts on a switching lock 37, which is only shown schematically and which ensures that the movable contact lever 33 remains open.
  • thermobimetal 39 acts with its free end on the switching mechanism 27 and the movable contact lever 33 also spends in the dashed position 33 'so that the contact lever 33 is permanently moved to the off position.
  • the coil 35 is connected on the one hand to the fixed contact piece 30 and on the other hand via an extension 40 with the thermobimetal 39, so that in the normal case current from the terminal 18 via a stranded wire, not shown, to the contact lever 33, to the fixed contact piece 30, to the coil 35 and over the bimetal 39 flows to the terminal 19.
  • the area in which the fixed and the movable contact piece 30, 31, the arc guide rails 20 and 26 and the arc quenching plate package 24 are located is referred to as the quenching chamber, the area immediately in front of the arc quenching plate package, designated by the reference number 41, being the prechamber.
  • the arc quenching plate packet 24 has a perforated cover plate 42, from where the arc gases generated during a switch-off operation reach an exhaust duct 43 and are thus blown off to the outside.
  • a switch toggle 44 is connected to the switch lock for reclosing.
  • the switching device 10 has a blow loop 45 formed from a resistance wire, which is bent into a ring, one end 46 of which is attached to the leg 27 in the region of the fixed contact piece 30. This end 46 runs parallel to the leg 27.
  • a section 47 running perpendicular to the leg 27 is formed, which reaches approximately into the region of the leg 22 of the arc guide rail 20 and is bent there approximately vertically; this forms a section 48 which runs approximately parallel to the arc guide rail 20, so that it is bent accordingly and has a region 49 which runs parallel to the leg 23 and to the arc extinguishing plates 25.
  • a section 50 is provided which runs perpendicular to the arc-quenching plates 25 and partially covers the coil 35 and has a section 51 which is arranged parallel to the arc-quenching plates 25 and approximately in the FIGS Area of section 47 opens.
  • connection end 52 which runs approximately parallel to the arc extinguishing plates 25 and which is connected to the thermobimetal 39 in the region of its fastening point is.
  • This blow loop 45 thus covers the prechamber area 41 and part of the arc-quenching plate packet and generates a magnetic field when the current flows through it, which is perpendicular to an arc and gives it an acceleration force in the direction of the arc-quenching sheet packet.
  • the blow loop is formed by a resistance wire made of copper wire, the resistance value being such that the ratio of the current values through the resistance wire to the current value through the triggers is approximately 0.6.
  • This value 0.6 can of course also vary to a certain extent. For example, For a nominal current of 80 amperes, the resistance value is expediently dimensioned such that 50 amperes flow over the triggers and 30 amperes flow over the resistance wire, whereas 63 amperes flow over the triggers for a nominal current of 100 amperes and 37 amperes flow over the resistance wire. In the latter case, the ratio is approximately 0.58.
  • triggers of devices with a nominal current of 50 amps or a nominal current of 63 amperes are achieved can also be used for switchgear with nominal currents of 80 or 100 amperes.
  • blow loop 45 is arranged so that it covers the contact point or the movable contact piece 31 even in the switched-off state, on the other hand, the entire prechamber space and, moreover, also a part of the arc quenching plate package, an arc that occurs immediately after the contact opening is immediately due to the magnetic field is driven in the direction of the arc-quenching plate packet and, after entry into the arc-quenching sheet packet, is also stabilized therein, so that the breaking capacity is improved.
  • the invention is described using a circuit breaker with an electromagnetic and a thermal release.
  • the invention can also be implemented in switching devices which have only an electromagnetic release for permanent or an impact anchor system for permanent opening of the contact points or only a thermal release.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
EP94102533A 1993-02-27 1994-02-19 Appareil de commutation avec un déclencheur thermique et magnétique. Withdrawn EP0614207A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4306229A DE4306229A1 (de) 1993-02-27 1993-02-27 Schaltgerät mit einem thermischen und einem magnetischen Auslöser
DE4306229 1993-02-27

Publications (2)

Publication Number Publication Date
EP0614207A2 true EP0614207A2 (fr) 1994-09-07
EP0614207A3 EP0614207A3 (fr) 1995-07-26

Family

ID=6481583

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94102533A Withdrawn EP0614207A3 (fr) 1993-02-27 1994-02-19 Appareil de commutation avec un déclencheur thermique et magnétique.

Country Status (2)

Country Link
EP (1) EP0614207A3 (fr)
DE (1) DE4306229A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2736462A1 (fr) * 1995-07-08 1997-01-10 Abb Patent Gmbh Dispositif d'extinction d'arc pour un interrupteur electrique, en particulier pour un disjoncteur de protection de ligne

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19518051A1 (de) * 1995-05-17 1996-11-21 Abb Patent Gmbh Lichtbogenlöscheinrichtung
DE102004032738A1 (de) * 2004-07-07 2006-02-09 Abb Patent Gmbh Lichtbogeneinrichtung für ein elektrisches Schaltgerät
DE102012208573A1 (de) * 2012-05-22 2013-11-28 Siemens Aktiengesellschaft Lichtbogen-Löschvorrichtung und Schutzschaltgerät

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3313898A (en) * 1964-07-01 1967-04-11 Gen Electric Circuit breaker with thermal trip device of high short-circuit withstandability
DE2609708B1 (de) * 1976-03-09 1977-07-14 Siemens Ag Leitungsschutzschalter mit lichtbogenanlaufhilfe
DE2610951B2 (de) * 1976-03-16 1980-01-24 Brown, Boveri & Cie Ag, 6800 Mannheim Schutzschalter
DE2841004B1 (de) * 1978-09-21 1980-02-14 Licentia Gmbh Leitungsschutzschalter mit zusaetzlicher Blasschleife
GB2055264A (en) * 1979-07-17 1981-02-25 Bbc Brown Boveri & Cie A circuit protection switch
DE3607052A1 (de) * 1985-03-04 1986-09-04 Westinghouse Electric Corp., Pittsburgh, Pa. Elektrisches schaltgeraet

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1680674A (en) * 1923-09-22 1928-08-14 Gen Electric Electric switch
DE2336916C3 (de) * 1973-07-20 1978-11-02 Brown, Boveri & Cie Ag, 6800 Mannheim Leitungsschutzschalter in Schmal- und Schalenbauweise
DD211668A1 (de) * 1982-11-11 1984-07-18 Elektroinstallation Annaberg V Leitungsschutzschalter mit einer eine blasschleife bildenden kontaktanordnung
FR2549638B1 (fr) * 1983-07-18 1988-11-18 Etude Realisa Disjoncteurs Sa Disjoncteur avec dispositif d'acceleration de deplacement d'arc
GB2192096B (en) * 1986-05-31 1989-12-06 Crabtree Electrical Ind Ltd Circuit breaker

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3313898A (en) * 1964-07-01 1967-04-11 Gen Electric Circuit breaker with thermal trip device of high short-circuit withstandability
DE2609708B1 (de) * 1976-03-09 1977-07-14 Siemens Ag Leitungsschutzschalter mit lichtbogenanlaufhilfe
DE2610951B2 (de) * 1976-03-16 1980-01-24 Brown, Boveri & Cie Ag, 6800 Mannheim Schutzschalter
DE2841004B1 (de) * 1978-09-21 1980-02-14 Licentia Gmbh Leitungsschutzschalter mit zusaetzlicher Blasschleife
GB2055264A (en) * 1979-07-17 1981-02-25 Bbc Brown Boveri & Cie A circuit protection switch
DE3607052A1 (de) * 1985-03-04 1986-09-04 Westinghouse Electric Corp., Pittsburgh, Pa. Elektrisches schaltgeraet

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2736462A1 (fr) * 1995-07-08 1997-01-10 Abb Patent Gmbh Dispositif d'extinction d'arc pour un interrupteur electrique, en particulier pour un disjoncteur de protection de ligne

Also Published As

Publication number Publication date
EP0614207A3 (fr) 1995-07-26
DE4306229A1 (de) 1994-09-01

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