US3154662A - Electrical switchgear with electro-dynamic strengthening of the contactpressure - Google Patents

Electrical switchgear with electro-dynamic strengthening of the contactpressure Download PDF

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Publication number
US3154662A
US3154662A US203303A US20330362A US3154662A US 3154662 A US3154662 A US 3154662A US 203303 A US203303 A US 203303A US 20330362 A US20330362 A US 20330362A US 3154662 A US3154662 A US 3154662A
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US
United States
Prior art keywords
conductor pieces
contact
end portions
bridges
contact bridge
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
US203303A
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English (en)
Inventor
Heupel Friedrich
Kotoll Sigmar
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.)
BBC Brown Boveri AG Germany
Original Assignee
Bbc Brown Boveri & Cie
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 Bbc Brown Boveri & Cie filed Critical Bbc Brown Boveri & Cie
Application granted granted Critical
Publication of US3154662A publication Critical patent/US3154662A/en
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
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20—Bridging contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • H01H1/54—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by magnetic force

Definitions

  • This invention relates to electrical switchgear apparatus and more particularly to electrical switches having conductor pieces forming parallel current paths through the same and a movable contact bridge for each path.
  • the object of the invention in general, is to provide an improved switch construction of the type described and wherein the conductor pieces and their respective contact bridges forming these parallel current paths are mutually attracted by electro-dynamic forces derived from the current passing through the conductor pieces and in such manner that the conductor pieces and the contact bridges of the respective current paths are always maintained at a very small distance apart thus assuring a high degree of mutual attraction and a corresponding high degree of contact pressure between the conductor pieces of the two current paths and their respective contact bridges.
  • the present invention is directed to a load switch which provides for electro-dynamic strengthening of the contact pressure, the switch being provided with parallel current paths which are opened and closed respectively by means of contact bridges, and the two current paths represented by elongated conductor pieces being arranged both spacially and electrically in parallel with a very small gap therebetween. Because of this very small gap, the mutually attractive forces between the elongated conductor pieces forming the two current paths and their contact bridges becomes correspondingly high and hence, results in a high degree of contact pressure between the contact bridges and their respective conductor pieces.
  • the pressure contact points of the contact bridges lie on the same sides of the bridges, i.e. also on the same sides of the conductor pieces forming the two current paths.
  • the contact bridge associated with one of the current paths is connected by a spring to the operating member for the contact bridges and the conductor pieces associated with this contact bridge are supported so as to be immovable.
  • the con- "ice tact bridge associated with the other current path is rigidly connected to the operating member for the contact bridges and the conductor pieces associated with this latter contact bridge are spring supported. The positioning of the springs is so arranged that the spring derived forced associated with the spring loaded contact bridge acts in opposition to the spring derived force associated with the spring loaded conductor pieces.
  • FIG. 1 is a view of the improved switch structure in side elevation, this view being limited, in the interest of simplifying the drawing, to those parts of the switch struc ture which characterize the invention;
  • FIG. 2 is a vertical section taken on line 2-2 of FIG. 1.
  • the improved electrical load switch is comprised of two current paths I and II therethrough arranged electrically in parallel.
  • Current path I is constituted by two elongated conductor pieces 10 and 11 in the form of bars arranged along a rectilinear line and with end portions 10a, 1101 located in confront ing spaced relation. These end portions 10a, 11a are adapted to be connected and disconnected by means of a contact bridge 12.
  • the elongated conductor pieces 10 and 11 are secured rigidly near their ends 10a, 11a to fixed supports 13, 14 respectively, which may be made of insulating material and thus the conductor pieces 10, 11 are rendered substantially immovable.
  • Current path II is also constituted by two elongated conductor pieces 15, 16 in the form of bars arranged along a rectilinear line located beneath conductor pieces 10, 11 and with end portions 150, 16a located in confronting spaced relation.
  • the conductor pieces 10, 11 constituting path I lie spacially and electrically parallel to conductor pieces 15, 16 constituting path II and are spaced from each other by a small distance 7'.
  • the end portions 15a, 16a are adapted to be connected and disconnected by means of a contact bridge 17.
  • the end portions 15a, 16a of conductor pieces 15, 16 are supported on springs 18, 19 respectively which engage the end portions 15a, 16a from beneath so as to urge them in the direction of the upper conductor pieces 16, 11, as indicated by the arrows.
  • the two contact bridges 12 and 17 are arranged for operation together by an actuating member 20 which is arranged for movement in a direction normal to the conductor pieces 1%, 11 and 15, 16.
  • Contact bridge 17 is secured rigidly with respect to the actuating member 20 but the other contact bridge 12 is mounted in a yielding manner with respect to actuating member 2t
  • This yieldable mount is established by means of a plate 21 upstanding on the actuating member 20 and secured rigidly thereto.
  • Contact bridge 12 includes a pin 22 projecting laterally and which engages in an elongated slot 23 in plate 21 extending in the direction of movement of the actuating member 20.
  • a loading spring 24 under compression has its upper end in abutment with a flange 25 extending laterally outward from plate 21 and its lower end in abutment with the upper face of contact bridge 12.
  • spring 24 exerts a loading force on contact bridge 12 in the direction of the rigidly mounted conductor piece ends 19a, 11a as indicated by the arrow.
  • contact bridge 12 is spring loaded downwardly in the direction of the immovable conductor piece ends 10a, 11a, and the conductor piece ends 150, 16a are spring loaded upwardly in the direction of the contact bridge 17.
  • the directions of spring-action of the spring-loaded bridge 12 and the springloaded conductor piece ends 15a, 16a are in opposition.
  • the actuating member 20 is moved downwardly to the position indicated in FIG. 1. Since the contact bridge 17 is secured immovably with respect to the actuating member 20, the electro-dynamically produced force derived from the current passing along the paths I and II takes effect upon the spring-loaded contact bridge 12 whereupon the latter is induced to exert a higher degree of pressure downwardly against the im movable conductor piece ends 10a, Ila than is normally exerted by spring 24. p
  • the conductor pieces forming the two component current paths I and II are arranged parallel to each other with a minimum gap 1, and this minimum gap is maintained electro-dynamically and with increased pressure between the contacts due to the fact that the pressure contact positions are arranged on the same sides of the contact bridges 12 and 17, namely, at the lower sides or faces in accordance with the illustrated embodiment of the invention which is to say that in such embodiment the pressure contact positions of the conductor piece ends 10a, 11a and 15a, 16:: are located on their upper sides or faces.
  • the improved switch construction in accordance with the invention enables the conductor elements of the two switch paths I and II to be mutually attracted by electro-dynamic forces and maintained at a small distance apart, these electro-dynarnically derived forces supplementing the normal forces derived from springs 18, 19 and 24 to increase the contact forces between the contact bridges 12 and 17 and their respective conductor piece ends 10a, 11a and 15a, 16a, especially under higher than normal current loads passing through the switch, one is enabled to control the flow of substantially higher short-circuit currents through the switch without damage to the contacts than is possible with the prior known constructions.
  • the switch operates with a pressure-contact.
  • the spring loaded components which have been described can be further sub-divided so that there will exist several parallel contact points in each of the two current paths.
  • each said current path being constituted by elongated conductor pieces in alignment and having end portions arranged in confronting spaced relation and including a contact bridge adapted to be engaged with and disengaged from the end portions of said conductor pieces, the pressure contact positions of said contact bridges with respect to the end portions of the conductorpieces being located on the same sides of said bridges, means mounting the elongated conductor pieces constituting a first one of said current paths such that said conductor pieces and the confronting end portions thereof are substantially immovable, an actuating member for said contact bridges, means including spring means mounting a first one of said contact bridges on said actuating member, said spring means serving to load said contact bridge into engagement with the substantiaily immovable end portions of the conductor pieces forming said first current path, means mounting the second of said contact bridges rigidly on said actuating member, and means including spring means
  • said actuating member includes a plate member extending normal to said conductor pieces
  • said means for mounting said first contact bridge includes a compression spring having one end thereof in abutment with a laterally extending stop on said plate member and the opposite end thereof in abutment with said first contact bridge, said first contact bridge also being provided with a pin projecting outwardly therefrom and which is entered into a slot in said plate member, said slot being elongated in the direction of movement of said plate member.

Landscapes

  • Breakers (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Contacts (AREA)
US203303A 1961-06-20 1962-06-18 Electrical switchgear with electro-dynamic strengthening of the contactpressure Expired - Lifetime US3154662A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEB62954A DE1176239B (de) 1961-06-20 1961-06-20 Elektrischer Schalter mit elektrodynamischer Kontaktdruckverstaerkung
DE6603789U DE6603789U (de) 1961-06-20 1961-06-20 Elektrischer schalter mit elektrodynamischer kontaktdruckverstaerkung

Publications (1)

Publication Number Publication Date
US3154662A true US3154662A (en) 1964-10-27

Family

ID=25945860

Family Applications (1)

Application Number Title Priority Date Filing Date
US203303A Expired - Lifetime US3154662A (en) 1961-06-20 1962-06-18 Electrical switchgear with electro-dynamic strengthening of the contactpressure

Country Status (4)

Country Link
US (1) US3154662A (de)
CH (1) CH394337A (de)
DE (2) DE6603789U (de)
GB (1) GB953269A (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3436497A (en) * 1967-08-31 1969-04-01 Cutler Hammer Inc Electrical switch having a lost motion operator assembly
US3458670A (en) * 1966-07-27 1969-07-29 Reinhausen Maschf Scheubeck Top changer contact bridge with spring-biased lost motion pin connection
US3461259A (en) * 1968-01-22 1969-08-12 Westinghouse Electric Corp Spring contact-finger construction
US4142081A (en) * 1976-09-30 1979-02-27 Siemens Aktiengesellschaft Contact system for high-voltage power circuit breakers
US5296660A (en) * 1992-02-07 1994-03-22 Merlin Gerin Auxiliary shunt multiple contact breaking device
US5652416A (en) * 1995-11-22 1997-07-29 Onan Corporation Mechanically held electrically or manually operated switch
US5815058A (en) * 1997-04-02 1998-09-29 Onan Corporation Contact enhancement apparatus for an electric switch
US20150213982A1 (en) * 2014-01-28 2015-07-30 Lsis Co., Ltd. Relay
EP3223289B1 (de) * 2016-03-25 2023-03-01 Hamilton Sundstrand Space Systems International, Inc. Elektrische schützanordnung

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2530373A1 (fr) * 1982-07-13 1984-01-20 Merlin Gerin Interrupteur electrique multipolaire a basse tension et a haute tenue electrodynamique
DE3506289A1 (de) * 1985-02-22 1986-08-28 Willi 7120 Bietigheim-Bissingen Quitoschinger Elektrischer druckschalter
DE19830231B4 (de) * 1998-07-07 2008-10-23 Abb Research Ltd. Nennstromkontaktanordnung eines Leistungsschalters

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1056696B (de) * 1952-05-23 1959-05-06 Siemens Ag Elektrischer Schalter mit einer Vielzahl von hintereinandergeschalteten Unterbrechungsstellen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE499446C (de) * 1928-06-27 1930-06-06 Oerlikon Maschf Schalter zum Ein- und Ausschalten hoher Stroeme

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1056696B (de) * 1952-05-23 1959-05-06 Siemens Ag Elektrischer Schalter mit einer Vielzahl von hintereinandergeschalteten Unterbrechungsstellen

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3458670A (en) * 1966-07-27 1969-07-29 Reinhausen Maschf Scheubeck Top changer contact bridge with spring-biased lost motion pin connection
US3436497A (en) * 1967-08-31 1969-04-01 Cutler Hammer Inc Electrical switch having a lost motion operator assembly
US3461259A (en) * 1968-01-22 1969-08-12 Westinghouse Electric Corp Spring contact-finger construction
US4142081A (en) * 1976-09-30 1979-02-27 Siemens Aktiengesellschaft Contact system for high-voltage power circuit breakers
US5296660A (en) * 1992-02-07 1994-03-22 Merlin Gerin Auxiliary shunt multiple contact breaking device
US5652416A (en) * 1995-11-22 1997-07-29 Onan Corporation Mechanically held electrically or manually operated switch
US5815058A (en) * 1997-04-02 1998-09-29 Onan Corporation Contact enhancement apparatus for an electric switch
US20150213982A1 (en) * 2014-01-28 2015-07-30 Lsis Co., Ltd. Relay
US9613771B2 (en) * 2014-01-28 2017-04-04 Lsis Co., Ltd. Relay
EP3223289B1 (de) * 2016-03-25 2023-03-01 Hamilton Sundstrand Space Systems International, Inc. Elektrische schützanordnung

Also Published As

Publication number Publication date
DE1176239B (de) 1964-08-20
DE6603789U (de) 1969-11-06
GB953269A (en) 1964-03-25
CH394337A (de) 1965-06-30

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