EP0089309B1 - Isolator or earthing switch comprising rotating contact knives - Google Patents

Isolator or earthing switch comprising rotating contact knives Download PDF

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Publication number
EP0089309B1
EP0089309B1 EP83730004A EP83730004A EP0089309B1 EP 0089309 B1 EP0089309 B1 EP 0089309B1 EP 83730004 A EP83730004 A EP 83730004A EP 83730004 A EP83730004 A EP 83730004A EP 0089309 B1 EP0089309 B1 EP 0089309B1
Authority
EP
European Patent Office
Prior art keywords
switch
blade
knife
contact
closed
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
Application number
EP83730004A
Other languages
German (de)
French (fr)
Other versions
EP0089309A3 (en
EP0089309A2 (en
Inventor
Manfred Dipl.-Kfm. Meinherz
Jörg Tietze
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
Original Assignee
Siemens AG
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 filed Critical Siemens AG
Publication of EP0089309A2 publication Critical patent/EP0089309A2/en
Publication of EP0089309A3 publication Critical patent/EP0089309A3/en
Application granted granted Critical
Publication of EP0089309B1 publication Critical patent/EP0089309B1/en
Expired 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
    • H01H31/003—Earthing switches
    • 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
    • H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
    • H01H1/42—Knife-and-clip contacts
    • 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
    • H01H31/28—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 angularly-movable contact
    • 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

  • the invention relates to an electrical disconnector or earthing switch, each consisting of switching knives movable around a pivot point and knife contacts with a central slot open on one side, the side walls of which form resilient current contacts, which in the closed state of the switch laterally on the perpendicular to the knife contact and in the switching knife engaging the slot.
  • Disconnectors constructed in this way are generally known and, for. B. in DE-A-23 12900 in Figs. 12 to 15.
  • the knife contact is approximately parallel to the switching knife, the pivot point about which the switching knife is moved lying above or below the range of the current contacts of the knife contact.
  • the rotation of the switching knife when the switch closes results in a movement of the upper end of the switching knife towards the knife contact, into which it enters the central slot from the front side until it, perpendicular to the knife contact, reaches the end position in the area of the current contacts.
  • the invention is therefore based on the object, in an electrical disconnector or earthing switch with a blade contact connection, to prevent the switching blade from being pressed out of the blade contact due to the possible current forces in the event of short circuits.
  • an electrical disconnector or earthing switch of the type described at the outset is designed in accordance with the invention in such a way that the switch blade in the open position of the disconnector or earthing switch is approximately opposite the blade contact and when the switch is closed from the closed side of the blade contact the slot is inserted and led to the area of the current contacts and that an insulating stop is arranged below the knife contact, against which the switching knife rests in the closed position.
  • the switch blade is therefore no longer in the open position of the disconnector or earthing switch on the side of the blade contact facing away from the pivot point, as is customary hitherto, but the blade contact and switch blade lie approximately opposite one another. H. they are at an angle to each other or above or below or next to each other. This results in a reversal of the direction of rotation of the switching knife in relation to the position of the fixed knife contact for the switching movement, and it is achieved that the switching knife moves from the closed side of the knife contact into its central slot.
  • the stop made of insulating material still supports the knife contact so that it cannot bend.
  • FIGS. 1 and 2 of the drawing An embodiment of the invention is shown schematically in FIGS. 1 and 2 of the drawing.
  • Fig. 1 shows the closed position of the circuit breaker seen from the side
  • Fig. 2 shows a top view of the knife contact.
  • the fixed blade contact 1 of an electrical isolating switch has a central slot 2 which is open on the end face 4 of the blade contact 1 opposite the attachment to the switch housing 3.
  • the switching knife 6 is movable about the pivot point 7 and is in the open position of the disconnector in the position indicated by dash-dotted lines in FIG. 1 parallel above the knife contact 1.
  • the switch blade 6 moves in the direction of rotation indicated by the arrow 8 towards the blade contact 1, in the slot 2 of which it enters from the closed side 9.
  • the entry direction of the switching knife 6, which runs from behind, is indicated in FIG. 2 by the arrow 10.
  • the switch blade 6 In its end position, the switch blade 6 is perpendicular to the blade contact 1 when the disconnector is closed and bears against a stop 11 made of insulating material which is arranged below the blade contact 1.
  • This stop 11 made of insulating material which does not hinder the switching movement of the switching knife 6, supports the knife contact 1, so that it does not bend and also prevents the forces indicated in FIG. 1 by the arrows 12, which are exerted by the current loop, particularly in the event of a short circuit, the frictional forces of the current contacts 5 can exceed, the switch blade 6 can unscrew from the blade contact 1.

Landscapes

  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Contacts (AREA)

Description

Die Erfindung bezieht sich auf einen elektrischen Trenn- oder Erdungsschalter, bestehend aus jeweils um einen Drehpunkt beweglichen Schaltmessern und Messerkontakten mit einem einseitig offenen mittleren Schlitz, dessen Seitenwände federnde Stromkontakte bilden, die in geschlossenem Zustand des Schalters seitlich an dem senkrecht zum Messerkontakt stehenden und in den Schlitz eingreifenden Schaltmesser anliegen.The invention relates to an electrical disconnector or earthing switch, each consisting of switching knives movable around a pivot point and knife contacts with a central slot open on one side, the side walls of which form resilient current contacts, which in the closed state of the switch laterally on the perpendicular to the knife contact and in the switching knife engaging the slot.

Derartig aufgebaute Trennschalter sind allgemein bekannt und z. B. in der DE-A-23 12900 in den Fig. 12 bis 15 dargestellt. In geöffnetem Zustand des Trenn- oder Erdungsschalters liegt der Messerkontakt angenähert parallel zum Schaltmesser, wobei der Drehpunkt, um den das Schaltmesser bewegt wird, oberhalb oder unterhalb des Bereiches der Stromkontakte des Messerkontaktes liegt. Die Drehung des Schaltmessers beim Schließen des Schalters ergibt eine Bewegung des oberen Endes des Schaltmessers auf den Messerkontakt hin, in den es von der Stirnseite in den mittleren Schlitz eintritt, bis es, senkrecht zum Messerkontakt stehend, die Endlage im Bereich der Stromkontakte erreicht. Durch diese besondere Lage des Schaltmessers zum Messerkontakt ergeben sich bei Fließen eines Stromes Kräfte, die das Schaltmesser aus dem Messerkontakt drücken wollen und denen dieser, da der mittlere Schlitz des Messerkontaktes an der neben den Stromkontakten liegenden Stirnseite offen ist, nur wenig Widerstand, nämlich nur die Reibung der Stromkontakte entgegensetzt. Insbesondere im Kurzschlußfall besteht die Gefahr, daß die von der Stromschleife ausgeübten Kräfte größer als die Reibung der federnd am Schaltmesser anliegenden Stromkontakte ist, weshalb manchmal auch äußere Verriegelungen vorgesehen sind.Disconnectors constructed in this way are generally known and, for. B. in DE-A-23 12900 in Figs. 12 to 15. When the disconnector or earthing switch is open, the knife contact is approximately parallel to the switching knife, the pivot point about which the switching knife is moved lying above or below the range of the current contacts of the knife contact. The rotation of the switching knife when the switch closes results in a movement of the upper end of the switching knife towards the knife contact, into which it enters the central slot from the front side until it, perpendicular to the knife contact, reaches the end position in the area of the current contacts. Due to this special position of the switch blade relative to the blade contact, when a current flows, forces arise which want to push the blade out of the blade contact and which, since the middle slot of the blade contact is open on the end face lying next to the current contacts, only little resistance, namely only opposes the friction of the current contacts. In particular in the event of a short circuit, there is a risk that the forces exerted by the current loop will be greater than the friction of the current contacts resiliently applied to the switch blade, which is why external interlocks are sometimes also provided.

Der Erfindung liegt daher die Aufgabe zugrunde, bei einem elektrischen Trenn- oder Erdungsschalter mit einer Messerkontaktverbindung zu verhindern, daß das Schaltmesser aus dem Messerkontakt aufgrund der bei Kurzschlüssen möglichen Stromkräfte herausgedrückt wird.The invention is therefore based on the object, in an electrical disconnector or earthing switch with a blade contact connection, to prevent the switching blade from being pressed out of the blade contact due to the possible current forces in the event of short circuits.

Zur Lösung dieser Aufgabe ist ein elektrischer Trenn- oder Erdungsschalter der eingangs beschriebenen Art gemäß der Erfindung so ausgebildet, daß das Schaltmesser in offener Stellung des Trenn- oder Erdungsschalters angenähert gegenüber dem Messerkontakt liegt und beim Schließen des Schalters von der geschlossenen Seite des Messerkontaktes her in den Schlitz eingeführt und zum Bereich der Stromkontakte geführt wird und daß ein isolierender Anschlag unterhalb des Messerkontaktes angeordnet ist, an dem das Schaltmesser in der geschlossenen Stellung anliegt.To solve this problem, an electrical disconnector or earthing switch of the type described at the outset is designed in accordance with the invention in such a way that the switch blade in the open position of the disconnector or earthing switch is approximately opposite the blade contact and when the switch is closed from the closed side of the blade contact the slot is inserted and led to the area of the current contacts and that an insulating stop is arranged below the knife contact, against which the switching knife rests in the closed position.

Das Schaltmesser liegt also nicht mehr, wie bisher üblich, in offener Stellung des Trenn- oder Erdungsschalters auf der auf den Drehpunkt bezogenen abgewandten Seite des Messerkontaktes, sondern Messerkontakt und Schaltmesser liegen angenähert gegenüber, d. h. sie stehen schräg zueinander oder über- bzw. unter- oder nebeneinander. Dadurch ergibt sich für die Schaltbewegung eine Umkehrung der Drehrichtung des Schaltmessers bezogen auf die Lage des feststehenden Messerkontaktes, und es wird erreicht, daß das Schaltmesser von der geschlossenen Seite des Messerkontaktes in dessen mittleren Schlitz einfährt. Durch den unterhalb des Messerkontaktes angeordneten Anschlag, an dem das Schaltmesser in der geschlossenen Stellung des Trennschalters zur Anlage gelangt, wird ein Herausdrehen des Schaltmessers infolge der durch die Schleifenwirkung auftretenden Stromkräfte verhindert. Außerdem ergibt der Anschlag aus Isolierstoff noch eine Abstützung des Messerkontaktes, so daß dieser sich nicht durchbiegen kann.The switch blade is therefore no longer in the open position of the disconnector or earthing switch on the side of the blade contact facing away from the pivot point, as is customary hitherto, but the blade contact and switch blade lie approximately opposite one another. H. they are at an angle to each other or above or below or next to each other. This results in a reversal of the direction of rotation of the switching knife in relation to the position of the fixed knife contact for the switching movement, and it is achieved that the switching knife moves from the closed side of the knife contact into its central slot. The stop arranged below the knife contact, against which the switch blade comes to rest when the disconnector is in the closed position, prevents the switch knife from being unscrewed due to the current forces caused by the loop effect. In addition, the stop made of insulating material still supports the knife contact so that it cannot bend.

Ein Ausführungsbeispiel der Erfindung ist schematisch in den Fig. 1 und 2 der Zeichnung dargestellt. Fig. 1 zeigt die geschlossene Stellung des Trennschalters von der Seite her gesehen, Fig. 2 zeigt einen Draufblick auf den Messerkontakt.An embodiment of the invention is shown schematically in FIGS. 1 and 2 of the drawing. Fig. 1 shows the closed position of the circuit breaker seen from the side, Fig. 2 shows a top view of the knife contact.

Der feststehende Messerkontakt 1 eines elektrischen Trennschalters weist einen mittleren Schlitz 2 auf, der auf der der Befestigung am Schaltergehäuse 3 entgegengesetzten Stirnseite 4 des Messerkontaktes 1 offen ist. Dort liegen auch die federnd ausgebildeten Stromkontakte 5, die in geschlossener Stellung des Trennschalters seitlich an dem Schaltmesser 6 zur Anlage gelangen. Das Schaltmesser 6 ist um den Drehpunkt 7 beweglich und liegt in offener Stellung des Trennschalters in der in Fig. 1 strichpunktiert angedeuteten Lage parallel oberhalb des Messerkontaktes 1.The fixed blade contact 1 of an electrical isolating switch has a central slot 2 which is open on the end face 4 of the blade contact 1 opposite the attachment to the switch housing 3. There are also the resiliently designed current contacts 5, which in the closed position of the isolating switch come to rest against the switch blade 6. The switching knife 6 is movable about the pivot point 7 and is in the open position of the disconnector in the position indicated by dash-dotted lines in FIG. 1 parallel above the knife contact 1.

Beim Schließen des Trennschalters bewegt sich das Schaltmesser 6 in der durch den Pfeil 8 angedeuteten Drehrichtung auf den Messerkontakt 1 zu, in dessen Schlitz 2 es von der geschlossenen Seite 9 her eintritt. Die von hinten verlaufende Einfahrtrichtung des Schaltmessers 6 ist in Fig. 2 durch den Pfeil 10 angedeutet. In seiner Endlage steht das Schaltmesser 6 bei geschlossenem Trennschalter senkrecht zum Messerkontakt 1 und liegt an einem unterhalb des Messerkontaktes 1 angeordneten Anschlag 11 aus Isolierstoff an. Dieser Anschlag 11 aus Isolierstoff, der die Schaltbewegung des Schaltmessers 6 nicht behindert, unterstützt den Messerkontakt 1, so daß dieser sich nicht durchbiegt und verhindert außerdem, daß die in Fig. 1 durch die Pfeile 12 angedeuteten, von der Stromschleife ausgeübten Kräfte, die besonders im Kurzschlußfall die Reibungskräfte der anliegenden Stromkontakte 5 übersteigen können, das Schaltmesser 6 aus dem Messerkontakt 1 herausdrehen können.When the disconnector is closed, the switch blade 6 moves in the direction of rotation indicated by the arrow 8 towards the blade contact 1, in the slot 2 of which it enters from the closed side 9. The entry direction of the switching knife 6, which runs from behind, is indicated in FIG. 2 by the arrow 10. In its end position, the switch blade 6 is perpendicular to the blade contact 1 when the disconnector is closed and bears against a stop 11 made of insulating material which is arranged below the blade contact 1. This stop 11 made of insulating material, which does not hinder the switching movement of the switching knife 6, supports the knife contact 1, so that it does not bend and also prevents the forces indicated in FIG. 1 by the arrows 12, which are exerted by the current loop, particularly in the event of a short circuit, the frictional forces of the current contacts 5 can exceed, the switch blade 6 can unscrew from the blade contact 1.

Claims (1)

  1. An electrical isolating or earthing switch comprising switch blades (6), rotatable in each case about a pivot (7), and knife-blade contacts (1) having a central slot (2) which is open at one end and whose side walls form resilient current contacts (5) which, in the closed state of the switch, are laterally adjacent to the switch blade (6) which is at right angles to the knife-blade contact (1) and engages into the slot (2), characterised in that, in the open position of the isolating or earthing switch, the switch blade (6) lies approximately opposite the knife-blade contact (1) and, when the switch is closed, it is introduced into the slot (2) from the closed end (9) of the knife-blade contact (1) and moved towards the region of the current contacts (5) ; and that an isolating stop (11) is arranged below the knife-blade contact (1), against which stop the switch blade (6) rests in the closed position.
EP83730004A 1982-02-08 1983-01-10 Isolator or earthing switch comprising rotating contact knives Expired EP0089309B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823204438 DE3204438A1 (en) 1982-02-08 1982-02-08 ELECTRICAL DISCONNECTING OR EARTHING SWITCH, CONSISTING OF SWITCHING KNIVES AND KNIFE CONTACTS MOVABLE AROUND A PIVOT POINT
DE3204438 1982-02-08

Publications (3)

Publication Number Publication Date
EP0089309A2 EP0089309A2 (en) 1983-09-21
EP0089309A3 EP0089309A3 (en) 1984-07-18
EP0089309B1 true EP0089309B1 (en) 1986-04-16

Family

ID=6155186

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83730004A Expired EP0089309B1 (en) 1982-02-08 1983-01-10 Isolator or earthing switch comprising rotating contact knives

Country Status (3)

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US (1) US4490595A (en)
EP (1) EP0089309B1 (en)
DE (2) DE3204438A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4744196A (en) * 1987-01-02 1988-05-17 Gallo Michael S Device for interlocking tongue-and-groove type bag
DE3742609A1 (en) * 1987-12-16 1989-06-29 Asea Brown Boveri Contact system for a high-voltage switch
NL1010515C2 (en) * 1998-11-09 2000-05-10 Elin Holec High Voltage Bv High voltage circuit breaker.
FR2809873B1 (en) * 2000-06-06 2002-12-13 Entrelec Sa SECTIONABLE ELECTRIC CONTACT DEVICE
FR2867603B1 (en) * 2004-03-10 2006-06-02 Areva T & D Spa DIRECT-INSERT, SWIVELD GROUND DISCONNECT SWITCH

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1031031A (en) * 1909-11-30 1912-07-02 Oakley S Walker Electrical switch.
US2544788A (en) * 1948-09-08 1951-03-13 Earl L Hindman Multiple contact selector switch
US3127491A (en) * 1960-01-11 1964-03-31 Mc Graw Edison Co High voltage air switch
US3410974A (en) * 1967-01-30 1968-11-12 Kelek Company Pressure switch mechanism
SE351515B (en) * 1971-04-21 1972-11-27 B Wennersten
FR2175619B1 (en) * 1972-03-16 1977-09-02 Acetp
US4342889A (en) * 1974-05-24 1982-08-03 G & W Electric Specialty Company Modular vault-type load break switch
DE2502162C3 (en) * 1975-01-21 1981-10-22 Calor-Emag Elektrizitäts-Aktiengesellschaft, 4030 Ratingen Top switches, in particular earthing switches

Also Published As

Publication number Publication date
EP0089309A3 (en) 1984-07-18
EP0089309A2 (en) 1983-09-21
US4490595A (en) 1984-12-25
DE3362973D1 (en) 1986-05-22
DE3204438A1 (en) 1983-08-18

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