EP3699941B1 - Switchgear - Google Patents

Switchgear Download PDF

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Publication number
EP3699941B1
EP3699941B1 EP20153668.7A EP20153668A EP3699941B1 EP 3699941 B1 EP3699941 B1 EP 3699941B1 EP 20153668 A EP20153668 A EP 20153668A EP 3699941 B1 EP3699941 B1 EP 3699941B1
Authority
EP
European Patent Office
Prior art keywords
arc
switchgear
barrier
quenching device
running electrode
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.)
Active
Application number
EP20153668.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3699941A1 (en
Inventor
Bernd Spritzendorfer
Michael Ertl
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.)
Eaton Intelligent Power Ltd
Original Assignee
Eaton Intelligent Power Ltd
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 Eaton Intelligent Power Ltd filed Critical Eaton Intelligent Power Ltd
Priority to PL20153668T priority Critical patent/PL3699941T3/pl
Publication of EP3699941A1 publication Critical patent/EP3699941A1/en
Application granted granted Critical
Publication of EP3699941B1 publication Critical patent/EP3699941B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • 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
    • 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
    • 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
    • H01H9/36—Metal parts
    • H01H2009/365—Metal parts using U-shaped plates
    • 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
    • H01H71/02—Housings; Casings; Bases; Mountings
    • 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
    • H01H71/14—Electrothermal mechanisms
    • H01H71/16—Electrothermal mechanisms with bimetal element
    • 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
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2463—Electromagnetic mechanisms with plunger type armatures
    • 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
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/52—Manual reset mechanisms which may be also used for manual release actuated by lever
    • 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
    • H01H9/345—Mounting of arc chutes
    • 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
    • H01H9/346—Details concerning the arc formation chamber

Definitions

  • the present disclosure relates to a switchgear according to the generic part of claim 1.
  • Switchgears especially circuit breakers, for interrupting high currents typically comprise a device for extinguishing an arc.
  • a common embodiment of such a device is an arc quenching chamber.
  • Known arc quenching chambers comprise a plurality of metal plates, isolated from each other. The arc is divided and cooled at the metal plates and thus extinguished. The separate metal plates are hold in an insulted body.
  • a drawback of these arc quenching chambers is the high number of individual parts and the high effort to assemble the complete arc quenching chamber.
  • the used metal plates are expensive, and they cause the further problem of possible short circuits between some of them. Metal plates further store thermal energy. This might be a risk in case of a series of short circuit events. The delayed heat emission can further damage the surrounding plastic parts of the switchgear.
  • US 2 871 318 A suggests circuit breakers in general, and, more particularly, to arc-extinguishing structures therefor.
  • the switchgear contains a low number of parts, and is easy to assemble. As no metal plates are necessary the risk of electric and/or thermal damage is decreased.
  • the arc quenching device can be made complete out of plastic, in one or two pieces, without the need to place a plurality of metal plates.
  • Fig. 1 and 2 showing a preferred embodiment of a switchgear 1 comprising at least one first contact 2 and one second contact 3 to form an electrical conducting path through the switchgear 1,
  • the switchgear 1 comprises a first arc running electrode 4, which first arc running electrode 4 is connected to the first contact 2 at least when the contacts 2, 3 are positioned in a separated state
  • the switchgear 1 comprises a second arc running electrode 5, which second arc running electrode 5 is connected to the second contact 3 at least when the contacts 2, 3 are positioned in the separated state
  • an arc quenching device 6 of the switchgear 1 is arranged at least partially in a space between the first arc running electrode 4 and the second arc running electrode 5,
  • the arc quenching device 6 comprises an arc entrance 7 and at least one gas outlet 8.
  • the arc quenching device 6 comprises at least one stationary non-conductive arc barrier 9, which arc barrier 9 is embodied and positioned to cross an arc traveling path 10 from the arc entrance 7 to the gas outlet 8.
  • the switchgear 1 contains a low number of parts, and is easy to assemble. As no metal plates are necessary the risk of electric and/or thermal damage is decreased.
  • the arc quenching device 6 can be made complete out of plastic, even in one or two pieces, without the need to place a plurality of metal plates.
  • the switchgear 1 is preferably embodied as circuit breaker, as shown in Fig. 1 and 2 .
  • the switchgear 1 comprises at least one trigger 19.
  • the switchgear according Fig. 1 and 2 comprises a first trigger comprising a bimetal element and a second trigger 19 in form of an electromagnetic-trigger.
  • the switchgear 1 comprises at least a first mechanical electrical contact 2 and a second mechanical electrical contact 3.
  • the first and second contacts 2, 3 form an electrical conducting path from a first clamping device 20 of the switchgear 1 to a second clamping device 21 of the switchgear 1.
  • the switchgear 1 comprises a first arc running electrode 4 and a second arc running electrode 5.
  • the first contact 2 is a stationary contact, which is positioned directly on the first arc running electrode 4.
  • the second contact 3 is a movable contact.
  • the contacts 2, 3 are positioned in a separated state, as shown in Fig. 1 and 2 , the second arc running electrode 5 is connected to the second contact 3.
  • the second contact 3 is connected to the first contact 2, the second arc running electrode 5 is not connected to the second contact 3.
  • the switchgear 1 comprises an arc quenching device 6.
  • Typical other terms for the arc quenching device 6 are arc extinguishing device, arc quenching chamber or arc extinguishing chamber.
  • an arc 22 will be established between the first contact and the second contact 2, 3.
  • the arc 22 moves from the contacts 2, 3 to the first and second arc running electrode 4, 5, and moves along them to the arc quenching device 6.
  • the arc quenching device 6 is arranged at least partially in a space between the first arc running electrode 4 and the second arc running electrode 5.
  • the arc quenching device 6 comprises an arc entrance 7 and at least one gas outlet 8.
  • the arc quenching device 6 is embodied as chamber, further comprising at least a first side wall 11 or first lateral surface and a second side wall 12 or second lateral surface.
  • the chamber has substantially the form of a cuboid, with the first and the second side walls 11, 12 each extending from the first arc running electrode 4 to the second arc running electrode 5, as shown in Fig. 1 and 2 .
  • the arc entrance 7 is an opening directed to the contacts 2, 3 of the switchgear 1.
  • the arc entrance 7 is - at least partially - formed as a nozzle 14, to compress the arc plasma.
  • the arc quenching device 6 comprises at least one stationary non-conductive arc barrier 9, which arc barrier 9 is embodied and positioned to cross an arc traveling path 10 from the arc entrance 7 to the gas outlet 8, which arc 22 is established between the first and the second arc running electrode 4, 5.
  • the arc barrier 9 extends the length of an arc 22 from the first arc running electrode 4 to the second arc running electrode 5 by crossing its way. This makes it necessary for the arc 22 to bend over the arc barrier 9.
  • Another term for the arc barrier 9 is non-conductive obstacle. "Non-conductive" means that the arc barrier 9 comprises at least an insulating surface.
  • the at least one arc barrier 9 can have different forms and different embodiments regarding the actual design of the complete arc quenching device 6.
  • the arc quenching device 6 contains a plurality of arc barriers 9.
  • the arc barriers 9 have substantially rectangular and/or L-shaped cross-sections, as shown in Fig. 3 . Especially the cross-section of the arc barrier 9 is not circular. This would increase the surface of the arc barrier 9 as well as the effect of cooling the arc 22.
  • the at least one arc barrier 9 extends from the first side wall 11 to the second side wall 12 of the arc quenching device 6.
  • the at least one arc barrier 9 is arranged substantially perpendicular to the first side wall 11 and/or the second side wall 12, what supports the manufacture of the arc quenching device 6 by injection molding.
  • the at least one arc barrier 9 is formed in one piece or integrally with the first side wall 11 and/or the second side wall 12.
  • the at least one arc barrier 9 is further preferably arranged substantially parallel to the first arc running electrode 4 and/or the second arc running electrode 5.
  • the arc quenching device 6 is preferably made of plastic material, which may be partially vaporized by an arc. Such plastic materials as well as the effect of vaporization are well known in the field of arc quenching devices 6.
  • the arc quenching device 6 comprises only non-conductive parts, preferably made of plastic material. This causes a very simple and cost effective arc quenching device 6.
  • the switchgear 1 typically comprises a molded housing 13 made of an insulating plastic material.
  • the arc quenching device 6 can be embodied as separate part, which is inserted into the switchgear 1. According a not shown embodiment, the arc quenching device 6 is an integral part of the switchgear 1, and the at least one arc barrier 9 is formed integrally with at least a part of the molded housing 13.
  • the at least one arc barrier 9 is embodied and arranged to cross the way of the arc 22 from the arc entrance 7 to the gas outlet 8.
  • the at least one arc barrier 9 is arranged in front of the at least one gas outlet 8. This means the arc barrier 9 is positioned in a sight line from the arc entrance 7 to the gas outlet 8 in such a way, that an arc has to pass the arc barrier 9 on its way to the gas outlet 8.
  • the arc quenching device 6 comprises a plurality of arc barriers 9.
  • the plurality of non-conductive arc barriers 9 is embodied and arranged in the arc quenching device 6 in such a way, that - in a view from the arc entrance 7 - at least 70% of the opening area of the at least one gas outlet 8 or the area of the sum of all areas of all gas outlets 8 is covered by the arc barriers 9.
  • the arc quenching device 6 according the embodiments shown in Fig. 1 to 3 comprises at least one conducting element 15.
  • This conduction element 15 is preferably not electrical connected to another part or a special electric potential.
  • the conducting element 15 it is embodied as arc splitting plate 16, which is preferably arranged substantially parallel to the first arc running electrode 4 and/or second arc running electrode 5.
  • the arc 22 will be divided and cooled at the splitting plate 16.
  • conducting element 15 it is embodied as conducting obstacle 17, which is embodied and positioned to cross the arc traveling path 10 from the arc entrance 7 to the gas outlet 8.
  • the at least one conducting obstacle 17 is arranged substantially parallel to the at least one non-conductive arc barrier 9.
  • Conducting obstacles 17 are helping to define a preferred arc path 10 through the arc quenching device 6.
  • Fig. 2 and 3 showing an arc quenching device 6 with conducting elements 15 according the first and the second embodiment.
  • Fig. 4 and 5 showing three dimensional views of the preferred embodiment of the actual arc quenching device 6.
  • the basic structure of the arc quenching device 6 is made of only two identical plastic parts 23, which also could be named as first half shell and second half shell. Both plastic parts 23 can be made with the same mold, and it is not necessary to hold different parts on stock.
  • the preferred arc quenching device 6 further comprises the conductive arc splitting plate 16, which is arranged in a slot 18 of the two half shells. Further conductive obstacles 17 are arranged in receptacles of the half shells. Although the conductive obstacles 17 are shown in Fig. 4 arranged at the first side wall 11 the receptacles for them in the second side wall 12 are not shown in the figures.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
EP20153668.7A 2019-02-21 2020-01-24 Switchgear Active EP3699941B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL20153668T PL3699941T3 (pl) 2019-02-21 2020-01-24 Rozdzielnica

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1902340.7A GB2581506A (en) 2019-02-21 2019-02-21 Switchgear

Publications (2)

Publication Number Publication Date
EP3699941A1 EP3699941A1 (en) 2020-08-26
EP3699941B1 true EP3699941B1 (en) 2022-03-02

Family

ID=65998904

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20153668.7A Active EP3699941B1 (en) 2019-02-21 2020-01-24 Switchgear

Country Status (4)

Country Link
EP (1) EP3699941B1 (zh)
CN (1) CN111599658B (zh)
GB (1) GB2581506A (zh)
PL (1) PL3699941T3 (zh)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2749410A (en) * 1952-08-12 1956-06-05 Allis Chalmers Mfg Co Arc chute with perforated barrier plates having staggered slots
BE546847A (zh) * 1955-04-07
US5861596A (en) * 1997-04-01 1999-01-19 Eaton Corporation Dual baffle apparatus for electrical switching device
FR2873511B1 (fr) * 2004-07-21 2006-12-29 Soule Prot Surtensions Sa Dispositif de protection contre les surtensions, les surcharges ou les courts-circuits a pouvoir de coupure ameliore
JP5084982B1 (ja) * 2012-05-18 2012-11-28 三菱電機株式会社 直流回路用回路遮断器及び直流回路用回路遮断装置
JP6342724B2 (ja) * 2014-06-13 2018-06-13 富士電機株式会社 回路遮断器

Also Published As

Publication number Publication date
GB201902340D0 (en) 2019-04-10
GB2581506A (en) 2020-08-26
PL3699941T3 (pl) 2022-04-19
CN111599658A (zh) 2020-08-28
CN111599658B (zh) 2022-09-30
EP3699941A1 (en) 2020-08-26

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