EP0776021A2 - Dispositif de commutation électrique - Google Patents

Dispositif de commutation électrique Download PDF

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Publication number
EP0776021A2
EP0776021A2 EP96810787A EP96810787A EP0776021A2 EP 0776021 A2 EP0776021 A2 EP 0776021A2 EP 96810787 A EP96810787 A EP 96810787A EP 96810787 A EP96810787 A EP 96810787A EP 0776021 A2 EP0776021 A2 EP 0776021A2
Authority
EP
European Patent Office
Prior art keywords
contact
switching device
insulating tube
electrical switching
erosion
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Withdrawn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
EP96810787A
Other languages
German (de)
English (en)
Other versions
EP0776021A3 (fr
Inventor
Daniel Bleiker
Jadran Kostovic
Markus Winkler
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 Asea Brown Boveri Ltd
ABB AB
Original Assignee
ABB Asea Brown Boveri Ltd
Asea Brown Boveri AB
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 Asea Brown Boveri Ltd, Asea Brown Boveri AB filed Critical ABB Asea Brown Boveri Ltd
Publication of EP0776021A2 publication Critical patent/EP0776021A2/fr
Publication of EP0776021A3 publication Critical patent/EP0776021A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
    • H01H31/26—Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch
    • H01H31/32—Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch with rectilinearly-movable contact
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/12—Auxiliary contacts on to which the arc is transferred from the main contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/045—Means for extinguishing or preventing arc between current-carrying parts for arcs formed during closing

Definitions

  • the invention is based on an electrical switching device according to the preamble of claim 1.
  • the published patent application DE-A1-42 10 545 describes an angle isolator for a metal-encapsulated gas-insulated high-voltage switchgear assembly, with two switching elements arranged in the metal-gas-filled encapsulation and which can be contacted or separated along an axis, each with a pin-shaped, axially extending pre-ignition contact, which is used in both Switch pieces is designed as a follow-up contact, and with a fixed contact coaxially surrounding the pre-ignition contact of a fixed two switch pieces and a running contact provided on a movable two switch pieces, which forms a continuous current path with the fixed contact in the switch-on position.
  • a disconnector for a metal-encapsulated gas-insulated switchgear which has a displaceable insulating tube which is arranged concentrically around the contact arrangement and which reliably prevents an arc which occurs during switching from expanding in the direction of the grounded encapsulation .
  • a disconnector for a metal-encapsulated gas-insulated switchgear is known, the movable contact of which is surrounded by an insulating ring which is preferred in the direction of the fixed contact of the disconnector.
  • This insulating ring also means that a switching arc cannot expand in the direction of the grounded enclosure.
  • the prior art described relates to disconnectors which only have to switch comparatively very small currents, i.e. that they only have to deal with comparatively weak electric arcs when switched on.
  • the invention as defined in claim 1, is based on the object of specifying an electrical switching device which is trained with simple means for switching on comparatively large currents.
  • the electrical switching device has a contact arrangement equipped with erosion-resistant contacts, which has at least one contact movable along an axis and at least one cylindrical one for the receptacle of the movable contact provided counter contact. It is particularly advantageous that at least one insulating tube is provided in the contact arrangement, which radially delimits an erosion-resistant contact area during a switch-on process, so that the arc base cannot migrate out of the intended area.
  • the described design of the insulating tube has proven particularly useful in a current range of approx. 40 kA to 80 kA inrush current.
  • the insulating tube is made of polytetrafluoroethylene (PTFE) or another temperature-resistant insulating material.
  • PTFE polytetrafluoroethylene
  • the insulating tube can, however, also be made of ceramic if comparatively high inrush currents are to be mastered, and if, in connection therewith, particularly high temperatures occur in the vicinity of the arc, which act on the insulating tube.
  • the insulating tube can be cylindrical or funnel-shaped opening to the opposite contact or with a radially extending collar.
  • the respective switching device can be installed regardless of the position, the respective design of the insulating tube does not affect the installation position of the relevant switching device.
  • a fast grounding switch as used in metal-encapsulated gas-insulated switchgear is considered as the electrical switching device.
  • Figure 1 shows a greatly simplified partial section through this quick-ground switch.
  • the counter contact 4 is also constructed cylindrically around the axis 3.
  • the counter-contact 4 is designed here as a fixed contact, but it could also move in the direction of the movable contact 1 or it could also be designed as a single movable contact.
  • the mating contact 4 has a contact pin 5 in the center, which is provided on the side facing the movable contact 1 with a cylindrical cap 6 made of electrically conductive, erosion-resistant material.
  • the cap 6 has a crowned surface 6a facing the movable contact 1.
  • the contact pin 5 together with the cap 6 is surrounded by an annular gap 7, which is provided for receiving the movable contact 1.
  • the annular gap 7 is delimited towards the outside by an electrically conductive contact carrier 8.
  • This contact carrier 8 is made of electrically conductive, erosion-resistant material at least on the side facing the movable contact 1.
  • Resilient contact elements designed as contact fingers 9 are embedded in the side of the contact carrier 8 facing the contact pin 5.
  • annular groove 11 is machined, into which an insulating tube 12 is snapped in a form-fitting manner so that it is positioned.
  • the insulating tube 12 protrudes by the dimension h beyond a surface 13 of the contact carrier 8 facing the movable contact 1 in the direction of the movable contact 1.
  • An annular recess 13a which is provided as a particle trap, is let into the surface 13, immediately adjacent to the insulating tube 12.
  • the surface 6a of the cap 6 generally also protrudes somewhat beyond the surface 13.
  • the insulating tube 12 has an inner diameter D.
  • the following relationship applies to the dimensions of the insulating tube 12: h A ⁇ (500 / D).
  • the factor A is usually in the range from 3.5 to 5.0, with a factor A of 4.3 being particularly favorable when currents in the range from approximately 40 kA to approximately 80 kA are switched on by the fast-grounding switch.
  • the insulating tube 12 is here made of polytetrafluoroethylene (PTFE), but other temperature-resistant insulating materials are also possible, in particular also materials composed of several layers or an insulating tube made of ceramic.
  • the counter contact 4 is surrounded on the outside by a shielding electrode 14. As shown, this shielding electrode 14 can be designed as a solid metal body, but it can also be formed from a comparatively thin aluminum sheet.
  • the movable contact 1 is tubular. Its tip 15 facing the counter contact 4 is made of electrically conductive, erosion-resistant material. The tip 15 is shaped such that spring-mounted contact fingers 16 are dielectrically shielded in the interior of the movable contact 1. When switched on, the contact fingers 16 run onto the cap 6 of the contact pin 5 and slide on its surface. In the interior of the movable contact 1, a volume 17 is provided which receives the contact pin 5.
  • the movable contact 1 also has an outer surface 18 on which the contact fingers 9 rest after the rapid earther is switched on.
  • the movable contact 1 in the direction of arrow 2 on the Counter contact 4 moves too, and with the greatest possible speed.
  • the pre-ignition distance there is first a breakdown between the tip 15 of the movable contact 1 or between the surface 13 of the contact carrier 8 and the surface 6a of the cap 6 of the contact pin 5 and an arc 19 is formed.
  • the arc 19 is shown here schematically by a shaded area enclosed by a dashed line.
  • the arc has differently extended arc bases and different thicknesses.
  • the arc base which forms on the counter-contact 4 and migrates on the surfaces 6a and 13 occupies the entire region of these surfaces 6a and 13 within the insulating tube 12.
  • the arc 19 may burn, since there the electrically conductive, erosion-resistant materials reliably prevent the material from being burned up too much.
  • the insulating tube 12 reliably prevents the arc base from expanding onto the surface of the shielding electrode 14.
  • This shielding electrode 14 It is therefore not necessary to also produce this shielding electrode 14 from the erosion-resistant material.
  • This electrically conductive, erosion-resistant material for example tungsten copper, is generally comparatively expensive; in particular, such large pieces as would be required for the shielding electrode 14 are very expensive to manufacture. So there is a significant economic advantage if the migration of the base of the arc 19 through Insulating tube 12 is limited to the area within the insulating tube 12.
  • the recess 13a is used, when the quick earth electrode is installed in the installation position shown in FIG. 1, to absorb combustion particles.
  • the movable contact 1 moves comparatively quickly in the direction of the arrow 2 towards the counter contact 4.
  • the arc 19 shortens as the movable contact 1 approaches the counter-contact 4.
  • the cloud of ionized gas mixed with electrically conductive burn-off particles generated by the arc is kept away from the shielding electrode 14 by the insulating tube 12, and therefore cannot shield the electrode 14 initiate outgoing rollover.
  • the contact fingers 16 of the movable contact 1 touch the cap 6, the arc 19 extinguishes.
  • the contact fingers 16 are somewhat attacked by the commutation arc which then occurs when contact is made.
  • the current path now leads temporarily from the contact fingers 16 of the movable contact 1 via the contact pin 5 through the mating contact 4.
  • the movable contact 1 continues to move in the switch-on direction until the contact fingers 9 of the mating contact 4 rest on the surface 18 of the movable contact 1.
  • the majority of the current flowing through the fast-grounding switch now flows from the movable contact 1 via the contact fingers 9.
  • the annular gap 7 is designed for receiving the movable contact 1.
  • the left half of the mating contact 4 shows a second possible embodiment variant of the insulating tube 12, specifically this tube widens out to the funnel shape of the movable contact 1.
  • the protective effect of the insulating tube 12 is improved, and the covering of the shielding electrode 14 is ensured more effectively.
  • the dimension h can be made smaller without reducing the effect of the insulating tube 12.
  • the factor A is reduced somewhat.
  • the right half of the mating contact 4 shows a third possible embodiment variant of the insulating tube 12, namely in this variant the insulating tube 12 is provided with an integrally formed collar 20 which extends in the radial direction on the side of the insulating tube 12 facing the movable contact 1.
  • this collar 20 does not have to be molded onto the end of the insulating tube 12, for example it can also be molded directly above the surface of the shielding electrode 14.
  • This third embodiment also improves the effect of the insulating tube 12, so that here too the dimension h can be somewhat reduced compared to the embodiment shown in FIG.
  • a large number of other effective configurations of the insulating tube 12 are also conceivable.
  • a circuit breaker can also be equipped with this insulating tube 12, which is pulled over the contact surface. It is also possible to let this insulating tube 12 emerge from the mating contact 4 only at the start of the respective switch-on, so that in the switched-off state the electrical field between the two contacts does not pass through the insulating tube 12 is affected. Such an insulating tube 12 would lead to smaller and thus more economical erosion contacts. Furthermore, it is possible to let the insulating tube 12 emerge from the contact surface even in the event of high-current disconnections.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Contacts (AREA)
EP96810787A 1995-11-24 1996-11-14 Dispositif de commutation électrique Withdrawn EP0776021A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1995143815 DE19543815A1 (de) 1995-11-24 1995-11-24 Elektrisches Schaltgerät
DE19543815 1995-11-24

Publications (2)

Publication Number Publication Date
EP0776021A2 true EP0776021A2 (fr) 1997-05-28
EP0776021A3 EP0776021A3 (fr) 1998-09-09

Family

ID=7778309

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96810787A Withdrawn EP0776021A3 (fr) 1995-11-24 1996-11-14 Dispositif de commutation électrique

Country Status (2)

Country Link
EP (1) EP0776021A3 (fr)
DE (1) DE19543815A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1569313A1 (fr) * 2004-02-27 2005-08-31 ABB Technology AG Appareil Haute Tension avec piège à particules
EP1895558A1 (fr) * 2006-08-30 2008-03-05 Areva T&D Sa Appareillage electriques sous enveloppe metalique comportant un piege a particules
KR101153915B1 (ko) * 2004-12-21 2012-06-11 에이비비 테크놀로지 아게 전기적 스위칭 디바이스를 위한 컨택트 시스템

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006016723A1 (de) * 2006-04-04 2007-10-11 Siemens Ag Lichtbogenkontaktstift

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3331819A1 (de) 1983-09-01 1985-03-21 Siemens AG, 1000 Berlin und 8000 München Trennschalter fuer metallgekapselte, druckgasisolierte hochspannungsschaltanlagen
DE4204529A1 (de) 1992-02-15 1993-08-19 Asea Brown Boveri Trennschalter fuer eine metallgekapselte gasisolierte hochspannungsanlage
DE4210545A1 (de) 1992-03-31 1993-10-07 Asea Brown Boveri Trennschalter für eine metallgekapselte gasisolierte Hochspannungsanlage

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2064037C2 (de) * 1970-12-28 1973-09-27 Voigt & Haeffner Gmbh, 6000 Frankfurt Schubtrennschalter
FR2285700A1 (fr) * 1974-09-19 1976-04-16 Alsthom Cgee Dispositif de coupure
CH653478A5 (en) * 1981-01-23 1985-12-31 Sprecher & Schuh Ag Gas-blast circuit breaker
DE3405850A1 (de) * 1984-02-16 1985-08-29 Siemens AG, 1000 Berlin und 8000 München Trennschalter fuer metallgekapselte, druckgasisolierte hochspannungsschaltanlagen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3331819A1 (de) 1983-09-01 1985-03-21 Siemens AG, 1000 Berlin und 8000 München Trennschalter fuer metallgekapselte, druckgasisolierte hochspannungsschaltanlagen
DE4204529A1 (de) 1992-02-15 1993-08-19 Asea Brown Boveri Trennschalter fuer eine metallgekapselte gasisolierte hochspannungsanlage
DE4210545A1 (de) 1992-03-31 1993-10-07 Asea Brown Boveri Trennschalter für eine metallgekapselte gasisolierte Hochspannungsanlage

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1569313A1 (fr) * 2004-02-27 2005-08-31 ABB Technology AG Appareil Haute Tension avec piège à particules
US7262362B2 (en) 2004-02-27 2007-08-28 Abb Technology Ag High voltage device with a particle trap
KR101153915B1 (ko) * 2004-12-21 2012-06-11 에이비비 테크놀로지 아게 전기적 스위칭 디바이스를 위한 컨택트 시스템
CN101128896B (zh) * 2004-12-21 2012-10-03 Abb技术有限公司 用于电开关设备的接触系统
EP1895558A1 (fr) * 2006-08-30 2008-03-05 Areva T&D Sa Appareillage electriques sous enveloppe metalique comportant un piege a particules
FR2905515A1 (fr) * 2006-08-30 2008-03-07 Areva T & D Sa Appareillage electrique sous enveloppe metallique comportant un piege a particules.

Also Published As

Publication number Publication date
EP0776021A3 (fr) 1998-09-09
DE19543815A1 (de) 1997-05-28

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