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EP0136965B1 - Isolating switch for a metal-clad pressurized-gas-insulated high-voltage switchgear - Google Patents

Isolating switch for a metal-clad pressurized-gas-insulated high-voltage switchgear Download PDF

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Publication number
EP0136965B1
EP0136965B1 EP84730086A EP84730086A EP0136965B1 EP 0136965 B1 EP0136965 B1 EP 0136965B1 EP 84730086 A EP84730086 A EP 84730086A EP 84730086 A EP84730086 A EP 84730086A EP 0136965 B1 EP0136965 B1 EP 0136965B1
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EP
European Patent Office
Prior art keywords
insulating tube
contact
resistors
disconnect switch
resistor
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
EP84730086A
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German (de)
French (fr)
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EP0136965A1 (en
Inventor
Winfried Dr.-Ing. Schulz
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Siemens AG
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Siemens AG
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Publication of EP0136965A1 publication Critical patent/EP0136965A1/en
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    • 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
    • H01H33/16—Impedances connected with 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
    • H01H31/32—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

Definitions

  • the invention relates to a disconnector for metal-encapsulated, compressed gas-insulated high-voltage switchgear with two cylindrical contact pieces, which may be surrounded by field electrodes and touch each other in the closed position, for which purpose during switching at least one contact piece moves on a common longitudinal axis, in which within a contact piece or one Field electrode, a movable insulating tube is arranged, which bridges the separation distance between the switching elements for as long as the switching elements are moved during switching.
  • Such a circuit breaker is known from DE-A-27 04 389 (GB-A-15 44 398).
  • This insulating tube which conducts the switching element, bridges the isolating path in each case in an arc-impermeable manner before the switching element comes into galvanic contact with the counter switching element.
  • the movement of the insulating tube is triggered by the movement of the contact piece.
  • the insulating tube thus forms a flashover cage which bridges the separation distance before the flashover distance is reached by the switching element.
  • the invention is also based on the problem of high-frequency vibrations in compressed gas-insulated, encapsulated high-voltage switchgear. It was recognized that some frequencies of these broadband high-frequency vibrations could possibly resonate with the natural frequencies resulting from the dimensions of the encapsulated high-voltage switchgear. Then, due to their reflection, standing waves arise within the encapsulated high-voltage switchgear, in whose local current maxima the flashover resistance may be reduced to such an extent that a flashover to metal encapsulation can occur there.
  • the invention has for its object to avoid such a high-frequency resonance vibration.
  • the invention is based on a disconnector for metal-encapsulated, compressed gas-insulated high-voltage switchgear with two cylindrical contact pieces, which may be surrounded by field electrodes and touch each other in the closed position, for which purpose at least one contact piece moves on a common longitudinal axis during switching, in which a movable insulating tube is arranged within a contact piece or a field electrode, which essentially bridges the separation distance between the contact pieces during switching as long as the contact pieces are moved.
  • This isolating switch is designed according to the invention so that there are two movable resistors of approximately the same size, of low induction and low capacitance, on the longitudinal axis, each of which is electrically connected or connectable to one of the switching elements External dimensions are smaller than the inner diameter of the insulating tube and which are introduced into the isolating section at the start of the switching movement and which, after at least largely bridging the isolating section through the isolating tube, also bridge them before the opposing contact pieces are brought into contact with one another or with the field electrodes.
  • a flashover arc can only form between the two resistors having different potential. Due to the damping effect of the resistors, the generation of high-frequency vibrations is prevented. In addition, the flashover arc cannot migrate to the encapsulation and thus trigger an earth short-circuit because it is shielded from the insulating tube that covers the separation distance. As a result of the use of two resistors of approximately the same size, the flashover arc burns approximately in the middle of the separation distance between the field electrodes. This results in the lowest capacitive coupling to the two line ends and a symmetrical damping of the high-frequency vibrations that arise.
  • the resistors have a thermally highly conductive ceramic carrier with solid metal contact, since they are exposed to the effects of arcing and the associated heating. It is expedient to make the metal contacts resilient at least on one of the mutually facing end faces of the resistors, so that an impact load on the resistors during switching is avoided. Neither their effectiveness nor their lifespan should be affected by the arcs.
  • the level of the resistance value results from the intrinsic capacity of the line to be disconnected, the operating voltage and the mains frequency. It is expedient that the voltage drop across the resistors, caused by the reactive current, does not exceed 1 to 2% of the operating voltage, because otherwise voltage surges occur again when the damping resistors are bridged.
  • the occurrence of sliding sparks on the surface of the insulating tube is avoided because it does not come into contact with the field electrode opposite.
  • other means can also be provided or combined therewith in order to avoid sliding sparks, e.g. B. in which the insulating tube is formed very highly ohmic semiconducting or that ribs are provided on its surface.
  • FIGS. 1 to 7 show, schematically represented, longitudinal sections through a disconnector designed according to the invention. 4 to 4 show a first exemplary embodiment, and FIGS. 5 to 7 show a second, somewhat modified exemplary embodiment. Only the parts necessary for understanding the invention are shown without the metal encapsulation. The same reference numerals are used for the same parts.
  • the first exemplary embodiment shown in FIGS. 1 to 4 is a disconnector for a metal-encapsulated high-voltage switchgear which is insulated with pressurized gas, in particular SF 6 , and which has two coaxial, opposing cylindrical contact pieces 1 and 2, which have the form of field electrodes . Between these, in the switched-off position, there is the isolating section 3, which is indicated by arrows. Inside the hollow cylindrical switching piece 2 on the right is a contact tube 4, which is galvanically connected to the switching piece 2 via a sliding contact 5 and thus has the same potential as this. This contact tube 4 has the function of a movable contact. On the front side, the contact tube 4 is provided with a bead 6 which, in the switched-on position, bears against the inwardly drawn edge 7 of the opposite contact piece 1.
  • this contact piece 1 there is also an insulating tube 8, which is provided with ribs 9 on its outer surface to avoid sliding sparks.
  • the outer diameter of the ribs 9 is smaller than the diameter of the edge 7 of the opening of the switching element 1.
  • two rod-shaped resistors 10 are also provided, which lie on the longitudinal axis of the switching elements 1 and 2.
  • the resistors 10 are constructed with low induction and capacitance and have a thermally highly conductive ceramic carrier, for example made of AL 2 0 3 . The resistance mass is burned in a suitable form on this.
  • the end faces 11 of the resistors are each provided with solid metal contacts.
  • the outside diameter of the resistors 10 is smaller than the inside diameter of the insulating tube 8.
  • Fig. 1 shows the switch-off position of the disconnector.
  • both the insulating tube 8 and the one resistor 10 are arranged in the interior of the left switching element 1 such that they do not protrude beyond the end face of the switching element 1.
  • the same applies to the switching piece 2 inside the other Resistor 10 and the contact tube 4 are.
  • the electrical field within the isolating section 3 is thus dependent on the shape of the contact pieces 1, 2 and is not disturbed by the internal parts.
  • Fig. 2 The start of the switch-on movement is shown in Fig. 2.
  • the insulating tube 8 is first moved out of the left switching piece 1 into the isolating section 3 until it reaches an end position which is at a distance 12 from the opposite switching piece 2, as indicated by arrows. This distance 12 is chosen so large that no sliding sparks can arise on the surface of the insulating tube.
  • the two resistors 10 are introduced symmetrically into the isolating section 3 from both sides by their own drive.
  • the residual separation path 13 remaining between its end faces 11 lies in the middle of the separation path 3.
  • a pre-flashover arc 14 occurs between the two resistors 10. Since this flashover arc 14 burns within the insulating tube 8 and protrudes sufficiently far, migration of the flashover arc 14 to the encapsulation is not possible because the insulating tube shields it.
  • no high-frequency oscillations can occur when the pre-flashover arc 14 is re-ignited.
  • the disconnector When the disconnector is opened, the movements of the individual parts run in reverse order. First, the contact tube 4 is drawn back into the interior of the contact piece 2 and the insulating tube 8 accordingly enters the isolating section 3 and bridges it to the distance 12. The two resistors 10 are withdrawn symmetrically from the isolating section 3 by means of their own drives and finally runs when the resistors 10 are in the rest position, the insulating tube 8 again out of the isolating section 3 until it is in its rest position inside the contact piece 1.
  • FIGS. 5 to 7 there is a standing cylindrical switching element 16 surrounded by a field electrode 15, which carries on its end face 17 a projection 18 which protrudes up to the end face of the field electrode 15.
  • This movable contact piece 19 is tubular and is in galvanic contact with the opposite field electrode 15 in its switched-on position.
  • the insulating tube 8 is arranged in the interior of the tubular contact piece 19, which has its own drive.
  • the high-resistance, semiconducting insulating tube 8 is provided with a metal contact 20 with a central opening 21, which in the closed position establishes the connection to the standing contact piece 16 with its extension 18.
  • This metal contact 20 is connected to one end of a resistor 22, which has a further metal contact 23 on its other end face.
  • This resistor 22 is fixed in the insulating tube 8 and moves together with it.
  • a second resistor 24 of the same size is arranged in the interior of the insulating tube 8, which is provided on its end face facing the isolating section with a resilient metal contact 25, while its other end is connected to its own drive, not shown.
  • the outer diameters of the resistors 22, 24 are each smaller than the inner diameter of the insulating tube 8.
  • Fig. 5 shows the off position of the circuit breaker, i. H. the movable tubular contact piece 19, like the insulating tube 8 with the two resistors 22 and 24, is located inside the field electrode 15.
  • the insulating tube 8 is first inserted into the isolating section 3 by means of its own drive and takes the first resistor 22 firmly connected to it until the electrical contact between the metal contact 20 and the stationary switching element 16 takes place. In this way, the resistor 22 is electrically connected to the standing contact piece 16 and maintains its potential. In this position, the entire isolating section 3 is bridged by the insulating tube 8. Then the second resistor 24 is guided inside the insulating tube 8 into the isolating section 3 by means of its own drive. This state is shown in Fig. 6.
  • the movement of the insulating tube 8 together with the resistor 22 can be relatively slow.
  • the resistor 24, on the other hand, should move faster so that a capacitive bridging between the resistor 24 and the movable contact piece 19 is avoided.
  • Fig. 7 shows the end position of the closed disconnector.
  • the individual parts move in reverse order. First, the movable contact piece 19 is retracted into its starting position inside the field electrode 15. Then the resistor 24 inside the insulating tube 8 is also brought back into its starting position. Finally, the insulating tube 8 is then removed from the isolating section 3 together with the resistor 22.

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  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Circuit Breakers (AREA)

Description

Die Erfindung bezieht sich auf einen Trennschalter für metallgekapselte, druckgasisolierte Hochspannungsschaltanlagen mit zwei zylindrischen Schaltstücken die gegebenenfalls von Feldelektroden umgeben sind und einander in Schließstellung berühren, wozu während des Schaltens sich zumindest ein Schaltstück auf einer beiden gemeinsamen Längsachse bewegt, bei dem innerhalb eines Schaltstücks oder einer Feldelektrode ein bewegbares Isolierrohr angeordnet ist, das während des Schaltens die Trennstrecke zwischen den Schaltstücken solange im wesentlichen überbrückt, wie die Schaltstücke bewegt werden.The invention relates to a disconnector for metal-encapsulated, compressed gas-insulated high-voltage switchgear with two cylindrical contact pieces, which may be surrounded by field electrodes and touch each other in the closed position, for which purpose during switching at least one contact piece moves on a common longitudinal axis, in which within a contact piece or one Field electrode, a movable insulating tube is arranged, which bridges the separation distance between the switching elements for as long as the switching elements are moved during switching.

Ein derartiger Trennschalter ist aus der DE-A-27 04 389 (GB-A-15 44 398) bekannt. Dieses das Schaltstück leitend umfassende Isolierrohr überbrückt jeweils die Trennstrecke lichtbogenundurchlässig, bevor das Schaltstück in galvanischem Kontakt mit dem Gegenschaltstück gelangt. Die Bewegung des Isolierrohres wird dabei von der Bewegung des Schaltstückes ausgelöst. Dadurch wird vermieden, daß ein beim Schalten des Trennschalters unter Spannung auftretender Vorüberschlaglichtbogen zwischen den noch einen gewissen Abstand voneinander aufweisenden Schaltstücken bei langsamen Schaltbewegungen auswandern und zur geerdeten Kapselung überschlagen kann. Das Isolierrohr bildet somit einen Vorüberschlaglichtbogenkäfig der die Trennstrecke überbrückt bevor der Vorüberschlagsabstand durch das Schaltstück erreicht wird. Bei dem Rücklauf das Schaltstückes verläßt das Isolierrohr die Trennstrecke erst, wenn sich das bewegliche Schaltstück im Bereich der Abschirmelektrode befindet, ein Überschlag also nicht mehr möglich ist.Such a circuit breaker is known from DE-A-27 04 389 (GB-A-15 44 398). This insulating tube, which conducts the switching element, bridges the isolating path in each case in an arc-impermeable manner before the switching element comes into galvanic contact with the counter switching element. The movement of the insulating tube is triggered by the movement of the contact piece. This prevents a pre-flashover arc occurring when the isolating switch is switched under voltage between the switching elements, which are still at a certain distance from one another, from migrating during slow switching movements and from flashing over to the grounded encapsulation. The insulating tube thus forms a flashover cage which bridges the separation distance before the flashover distance is reached by the switching element. When the contact piece returns, the insulating tube only leaves the isolating section when the movable contact piece is in the area of the shielding electrode, so that a rollover is no longer possible.

Weiterhin ist es aus der FR-A-15 14 265 bei Schaltern bereits bekannt, einen zylindrischen Widerstand im Innern des die Schaltkammer umgebenden Isoliergehäuses anzuordnen. Dieser Widerstand steht ständig mit dem einen Schaltstück des Schalters in Verbindung. Sein anderes Ende ist mit einer Kontaktschiene verbunden, die sich auf der Innenwand des Isoliergehäuses über einem gewissen Bereich erstreckt. Entsprechend weist das bewegliche Schaltstück einen Hilfskontakt auf, der an der Kontaktschiene vorbeistreichen kann. Bei Schließstellung des Schalters liegt das Hilfskontaktstück auf der Kontaktschiene so daß der Widerstand den Schaltstücken des Schalters parallel geschaltet ist. Dieser Zustand bleibt während des Beginns der Öffnungsbewegung das beweglichen Schaltstückes solange aufrechterhalten, bis das Hilfsschaltstück die Kontaktschiene verläßt. Dies ist aufgrund der Dimensionierung mit Sicherheit erst dann dar Fall, wenn der Schaltlichtbogen bereits gelöscht ist. Dann liegt also der Widerstand nicht mehr parallel zu den geöffneten Schaltstücken. Während des Schließvorgangens dieses Schalters wird der Widerstand in umgekehrter Weise wieder parallel geschaltet, bevor sich die Schaltkontakte berühren.Furthermore, it is already known from FR-A-15 14 265 for switches to arrange a cylindrical resistor in the interior of the insulating housing surrounding the switching chamber. This resistance is constantly connected to one contact of the switch. Its other end is connected to a contact rail which extends over a certain area on the inner wall of the insulating housing. Correspondingly, the movable contact piece has an auxiliary contact that can slide past the contact rail. When the switch is in the closed position, the auxiliary contact piece lies on the contact rail so that the resistance is connected in parallel with the contact pieces of the switch. This state remains maintained during the opening movement of the movable contact until the auxiliary contact leaves the contact rail. Due to the dimensioning, this is only certain if the switching arc has already been extinguished. Then the resistance is no longer parallel to the open contacts. During the closing process of this switch, the resistor is reversely connected in parallel again before the switching contacts touch.

Ferner ist es bekannt, siehe DE-A-24 06 160 (US-A-38 29 707) daß mit Schaltvorgängen Hochfrequenzschwingungen ausgelöst werden können. So treten breitbandige Hochfrequenzschwingungen insbesondere bei druckgasisolierten gekapsalten Hochspannungsschaltanlagen beim Schalten eines Trennschalters mit langsam beweglichen Schaltstücken auf. Bei der bekannten gekapselten mit SF6 isolierten Hochspannungsleitung werden diese Hochfrequenzschwingungen dadurch stark gedämpft bzw. abgeschwächt, daß das Leiterelement zumindest über einen Teil seiner Länge mit einem hochfrequenzdämpfenden Belag versehen sind. Dieser Belag setzt den Hochfrequenzschwingungen einen erheblichen Widerstand entgegen, beeinflußt aber nicht die mit normaler Betriebsfrequenz fließenden Ströme in dem darunter liegenden Leitermaterial.It is also known, see DE-A-24 06 160 (US-A-38 29 707), that high-frequency oscillations can be triggered by switching operations. Broadband high-frequency vibrations occur, in particular, in compressed gas-insulated, encapsulated high-voltage switchgear when switching an isolating switch with slowly moving contact pieces. In the known encapsulated high-voltage line insulated with SF 6 , these high-frequency vibrations are strongly damped or weakened in that the conductor element is provided with a high-frequency damping coating over at least part of its length. This coating provides a considerable resistance to the high-frequency vibrations, but does not influence the currents flowing in the underlying conductor material at the normal operating frequency.

Auch der Erfindung liegt das Problem von Hochfrequenzschwingungen in druckgasisolierten, gekapselten Hochspannungsschaltanlagen zugrunde. Man erkannte nämlich, daß einige Frequenzen dieser breitbandigen Hochfrequenzschwingungen unter Umständen in Resonanz zu den sich aus den Dimensionen der gekapselten Hochspannungsschaltanlage ergebenden Eigenfrequenzen liegen können. Dann entstehen durch ihre Reflexion innerhalb der gekapselten Hochspannungsschaltanlage stehende Wellen, in deren örtlichen Strommaxima die Überschlagsfestigkeit unter Umständen soweit herabgesetzt ist, daß dort ein Überschlag zur Metallkapselung auftreten kann. Der Erfindung liegt die Aufgabe zugrunde, eine derartige Hochfrequenzresonanzschwingung zu vermeiden.The invention is also based on the problem of high-frequency vibrations in compressed gas-insulated, encapsulated high-voltage switchgear. It was recognized that some frequencies of these broadband high-frequency vibrations could possibly resonate with the natural frequencies resulting from the dimensions of the encapsulated high-voltage switchgear. Then, due to their reflection, standing waves arise within the encapsulated high-voltage switchgear, in whose local current maxima the flashover resistance may be reduced to such an extent that a flashover to metal encapsulation can occur there. The invention has for its object to avoid such a high-frequency resonance vibration.

Zur Lösung dieser Aufgabe geht die Erfindung aus von einem Trennschalter für metallgekapselte, druckgasisolierte Hochspannungsschaltanlagen mit zwei zylindrischen Schaltstücken, die gegebenenfalls von Feldelektroden umgeben sind und einander in Schließstellung berühren, wozu während des Schaltens sich zumindest ein Schaltstück auf einer beiden gemeinsamen Längsachse bewegt, bei dem innerhalb eines Schaltstücks oder einer Feldelektrode ein bewegbares Isolierrohr angeordnet ist, das während des Schaltens die Trennstrecke zwischen den Schaltstücken solange im wesentlichen überbrückt, wie die Schaltstücke bewegt werden.To achieve this object, the invention is based on a disconnector for metal-encapsulated, compressed gas-insulated high-voltage switchgear with two cylindrical contact pieces, which may be surrounded by field electrodes and touch each other in the closed position, for which purpose at least one contact piece moves on a common longitudinal axis during switching, in which a movable insulating tube is arranged within a contact piece or a field electrode, which essentially bridges the separation distance between the contact pieces during switching as long as the contact pieces are moved.

Dieser Trennschalter ist gemäß der Erfindung so ausgebildet, daß auf der Längsachse zwei jeweils mit einem der Schaltstücke elektrisch verbundene bzw. verbindbare angenähert gleich große, induktions- und kapazitätsarm aufgebaute bewegbare Widerstände liegen, deren Außenabmessungen kleiner als der Innendurchmesser des Isolierrohres sind und die bei Beginn der Schaltbewegung in die Trennstrecke eingeführt werden und diese nach dem zumindest weitgehendem Überbrücken der Trennstrecke durch das Isolierrohr auch überbrücken, bevor die gegenüberliegenden Schaltstücke in Berührung miteinander oder mit den Feldelektroden gebracht werden.This isolating switch is designed according to the invention so that there are two movable resistors of approximately the same size, of low induction and low capacitance, on the longitudinal axis, each of which is electrically connected or connectable to one of the switching elements External dimensions are smaller than the inner diameter of the insulating tube and which are introduced into the isolating section at the start of the switching movement and which, after at least largely bridging the isolating section through the isolating tube, also bridge them before the opposing contact pieces are brought into contact with one another or with the field electrodes.

Dadurch wird erreicht, daß sich ein Vorüberschlaglichtbogen nur zwischen den beiden unterschiedliches Potential aufweisenden Widerständen ausbilden kann. Infolge der dämpfenden Wirkung der Widerstände wird die Entstehung von Hochfrequenzschwingungen verhindert. Außerdem kann der Vorüberschlaglichtbogen nicht zur Kapselung auswandern und somit einen Erdkurzschluß auslösen, weil er von dem die Trennstrecke weit überdeckenden Isolierrohr abgeschirmt ist. Infolge der Anwendung von zwei angenähert gleich großen Widerständen brennt der Vorüberschlaglichtbogen etwa in der Mitte der Trennstrecke zwischen den Feldelektroden. Dadurch erhält man die geringste kapazitive Kopplung zu den beiden Leitungsenden und eine symmetrische Bedämpfung der entstehenden Hochfrequenzschwingungen.It is thereby achieved that a flashover arc can only form between the two resistors having different potential. Due to the damping effect of the resistors, the generation of high-frequency vibrations is prevented. In addition, the flashover arc cannot migrate to the encapsulation and thus trigger an earth short-circuit because it is shielded from the insulating tube that covers the separation distance. As a result of the use of two resistors of approximately the same size, the flashover arc burns approximately in the middle of the separation distance between the field electrodes. This results in the lowest capacitive coupling to the two line ends and a symmetrical damping of the high-frequency vibrations that arise.

Es empfiehlt sich, daß die Widerstände einen thermisch gut leitenden Keramikträger mit massiver Metallkontaktierung aufweisen, da sie der Lichtbogeneinwirkung und der damit verbundenen Erhitzung ausgesetzt sind. Es ist zweckmäßig, die Metallkontakte zumindest an einer der einander zugewandten Stirnseiten der Widerstände federnd auszubilden, damit eine Stoßbeanspruchung der Widerstände während des Schaltens vermieden wird. Weder ihre Wirksamkeit noch ihre Lebensdauer sollte durch die Lichtbögen beeinträchtigt werden.It is recommended that the resistors have a thermally highly conductive ceramic carrier with solid metal contact, since they are exposed to the effects of arcing and the associated heating. It is expedient to make the metal contacts resilient at least on one of the mutually facing end faces of the resistors, so that an impact load on the resistors during switching is avoided. Neither their effectiveness nor their lifespan should be affected by the arcs.

Die Höhe des Widerstandswertes ergibt sich aus der Eigenkapazität der abzutrennenden Leitung, der Betriebsspannung und der Netzfrequenz. Es ist zweckmäßig, daß der Spannungsfall an den Widerständen, hervorgerufen durch den Blindstrom 1 bis 2 % der Betriebsspannung nicht überschreitet, weil sonst beim Überbrücken der Dämpfungswiderstände erneut Spannungsstöße auftreten.The level of the resistance value results from the intrinsic capacity of the line to be disconnected, the operating voltage and the mains frequency. It is expedient that the voltage drop across the resistors, caused by the reactive current, does not exceed 1 to 2% of the operating voltage, because otherwise voltage surges occur again when the damping resistors are bridged.

Ferner ist es zweckmäßig, in jeder der sich gegenüberstehenden Feldelektroden bzw. Schaltstücken des Trennschalters je einen der Widerstände anzuordnen und diese mit Hilfe eines eigenen Antriebes symmetrisch in die Trennstrecke zu führen, wenn des Isolierrohr seine Erdstellung in der Trennstrecke erreicht hat, die einen Abstand zur gegenüberliegenden Feldelektrode läßt. Auf diese Weise liegt die variable, zwischen den Spitzen der beiden Widerstände verbleibende Resttrennstrecke jeweils in der Mitte der Trennstrecke zwischen den beiden Feldelektroden.Furthermore, it is expedient to arrange one of the resistors in each of the opposing field electrodes or switching elements of the isolating switch and to guide them symmetrically into the isolating distance with the aid of a separate drive when the insulating tube has reached its earth position in the isolating distance that is at a distance from opposite field electrode leaves. In this way, the variable residual separation section remaining between the tips of the two resistors lies in the middle of the separation section between the two field electrodes.

Außerdem ist das Entstehen von Gleitfunken auf der Oberfläche des Isolierrohres vermieden weil dieses nicht in Berührung mit der gegenüberstehenden Feldelektrode kommt. Man kann aber auch andere Mittel vorsehen bzw. damit kombinieren, um Gleitfunken zu vermeiden, z. B. in dem das Isolierrohr sehr hochohmisch halbleitend ausgebildet ist oder daß auf seiner Oberfläche Rippen vorgesehen sind.In addition, the occurrence of sliding sparks on the surface of the insulating tube is avoided because it does not come into contact with the field electrode opposite. However, other means can also be provided or combined therewith in order to avoid sliding sparks, e.g. B. in which the insulating tube is formed very highly ohmic semiconducting or that ribs are provided on its surface.

Im folgenden sei die Erfindung noch anhand der in den Fig. 1 bis 7 dargestellten Ausführungsbeispiele näher erläutert. Die Figuren zeigen, jeweils schematisch dargestellt, Längsschnitte durch einen gemäß der Erfindung ausgebildeten Trennschalter. Dabei ist in den Fig bis 4 ein ersten Ausführungsbeispiel dargestellt, und die Fig. 5 bis 7 zeigen ein zweites, etwas abgewandeltes Ausführungsbeispiel. Es sind jeweils nur die zum Verständnis der Erfindung notwendigen Teile ohne die Metallkapselung dargestellt für gleiche Teile sind die gleichen Bezugszeichen beibehalten.The invention will be explained in more detail below with reference to the exemplary embodiments shown in FIGS. 1 to 7. The figures each show, schematically represented, longitudinal sections through a disconnector designed according to the invention. 4 to 4 show a first exemplary embodiment, and FIGS. 5 to 7 show a second, somewhat modified exemplary embodiment. Only the parts necessary for understanding the invention are shown without the metal encapsulation. The same reference numerals are used for the same parts.

Bei dem ersten in den Fig. 1 bis 4 dargestellten Ausführungsbeispiel handelt es sich um einen Trennschalter für eine metallgekapselte, mit Druckgas, insbesondere SF6, isolierte Hochspannungsschaltanlage der zwei koaxiale, einander gegenüberstehende zylindrische Schaltstücke 1 und 2 aufweist, welche die Form von Feldelektroden haben. Zwischen diesen befindet sich in der Ausschaltstellung die durch Pfeile angedeutete Trennstrecke 3. Im Innern des rechts liegenden hohlen zylindrischen Schaltstücks 2 ist ein Kontaktrohr 4 angeordnet, das über einen Gleitkontakt 5 galvanisch mit dem Schaltstück 2 verbunden ist und somit gleiches Potential wie dieses hat. Dieses Kontaktrohr 4 hat die Funktion eines beweglichen Schaltstückes. An der Stirnseite ist das Kontaktrohr 4 mit einem Wulst 6 versehen, der in der Einschaltstellung an dem nach innen gezogenen Rand 7 des gegenüberliegenden Schaltstückes 1 anliegt.The first exemplary embodiment shown in FIGS. 1 to 4 is a disconnector for a metal-encapsulated high-voltage switchgear which is insulated with pressurized gas, in particular SF 6 , and which has two coaxial, opposing cylindrical contact pieces 1 and 2, which have the form of field electrodes . Between these, in the switched-off position, there is the isolating section 3, which is indicated by arrows. Inside the hollow cylindrical switching piece 2 on the right is a contact tube 4, which is galvanically connected to the switching piece 2 via a sliding contact 5 and thus has the same potential as this. This contact tube 4 has the function of a movable contact. On the front side, the contact tube 4 is provided with a bead 6 which, in the switched-on position, bears against the inwardly drawn edge 7 of the opposite contact piece 1.

An diesem Schaltstück 1 liegt weiterhin ein lsolierrohr 8, das zur Vermeidung von Gleitfunken auf seiner Außenfläche mit Rippen 9 versehen ist. Der Außendurchmesser der Rippen 9 ist kleiner als der Durchmesser des Randes 7 der Öffnung des Schaltstückes 1. Weiterhin sind noch zwei stabförmige Widerstände 10 vorgesehen, die auf der Längsachse der Schaltstücke 1 und 2 liegen. Die Widerstände 10 sind induktions- und kapazitätsarm aufgebaut und weisen einen thermisch gut leitenden Keramikträger, z.B. aus AL203 auf. Auf diesem ist in geeigneter Form die Widerstandsmasse eingebrannt umgeben. Die Stirnflächen 11 der Widerstände sind jeweils mit massiven Metallkontakten versehen. Der Außendurchmesser der Widerstände 10 ist kleiner als der Innendurchmesser des Isolierrohres 8.On this contact piece 1 there is also an insulating tube 8, which is provided with ribs 9 on its outer surface to avoid sliding sparks. The outer diameter of the ribs 9 is smaller than the diameter of the edge 7 of the opening of the switching element 1. Furthermore, two rod-shaped resistors 10 are also provided, which lie on the longitudinal axis of the switching elements 1 and 2. The resistors 10 are constructed with low induction and capacitance and have a thermally highly conductive ceramic carrier, for example made of AL 2 0 3 . The resistance mass is burned in a suitable form on this. The end faces 11 of the resistors are each provided with solid metal contacts. The outside diameter of the resistors 10 is smaller than the inside diameter of the insulating tube 8.

Fig. 1 zeigt die Ausschaltstellung des Trennschalters. In dieser befinden sich im Innern des linken Schaltstückes 1 sowohl das Isolierrohr 8 als auch der eine Widerstand 10 derart angeordnet daß sie nicht über die Stirnfläche des Schaltstücks 1 hinüberragen. Das gleiche gilt für das Schaltstück 2 in dessen Innern der andere Widerstand 10 und das Kontaktrohr 4 liegen. Das elektrische Feld innerhalb der Trennstrecke 3 ist somit von der Form der Schaltstücke 1, 2 abhängig und wird durch die innenliegenden Teile nicht gestört.Fig. 1 shows the switch-off position of the disconnector. In this, both the insulating tube 8 and the one resistor 10 are arranged in the interior of the left switching element 1 such that they do not protrude beyond the end face of the switching element 1. The same applies to the switching piece 2 inside the other Resistor 10 and the contact tube 4 are. The electrical field within the isolating section 3 is thus dependent on the shape of the contact pieces 1, 2 and is not disturbed by the internal parts.

Der Beginn der Einschaltbewegung ist in Fig. 2 dargestellt. Mit Hilfe eines nicht dargestellten Antriebes wird zunächst allein das lsolierrohr 8 aus dem linken Schaltstück 1 heraus in die Trennstrecke 3 bewegt, solange bis es eine Endlage erreicht, die zum gegenüberliegenden Schaltstück 2 den durch Pfeile angedeuteten Abstand 12 aufweist. Dieser Abstand 12 ist so groß gewählt daß auf der Oberfläche des Isolierrohres keine Gleitfunken entstehen können.The start of the switch-on movement is shown in Fig. 2. With the help of a drive, not shown, the insulating tube 8 is first moved out of the left switching piece 1 into the isolating section 3 until it reaches an end position which is at a distance 12 from the opposite switching piece 2, as indicated by arrows. This distance 12 is chosen so large that no sliding sparks can arise on the surface of the insulating tube.

Als nächstes werden wie in Fig. 3 dargestellt, die beiden Widerstände 10 von beiden Seiten her durch je einen eigenen Antrieb symmetrisch in die Trennstrecke 3 eingebracht. Dadurch liegt die zwischen ihren Stirnflächen 11 verbleibende Resttrennstrecke 13 jeweils in der Mitte der Trennstrecke 3. Ist diese Trennstrecke 13 genügend klein geworden, so tritt ein Vorüberschlaglichtbogen 14 zwischen beiden Widerständen 10 auf. Da dieser Vorüberschlaglichtbogen 14 innerhalb des Isolierrohres 8 brennt das genügend weit übersteht, ist ein Auswandern des Vorüberschlaglichtbogens 14 zur Kapselung hin nicht möglich, da das Isolierrohr ihn abschirmt. Des weiteren können sich auch infolge der durch die Widerstände 10 gegebenen symmetrischen Dämpfung keine Hochfrequenzschwingungen beim Wiederzünden des Vorüberschlaglichtbogens 14 entstehen.Next, as shown in FIG. 3, the two resistors 10 are introduced symmetrically into the isolating section 3 from both sides by their own drive. As a result, the residual separation path 13 remaining between its end faces 11 lies in the middle of the separation path 3. If this separation path 13 has become sufficiently small, a pre-flashover arc 14 occurs between the two resistors 10. Since this flashover arc 14 burns within the insulating tube 8 and protrudes sufficiently far, migration of the flashover arc 14 to the encapsulation is not possible because the insulating tube shields it. Furthermore, due to the symmetrical damping provided by the resistors 10, no high-frequency oscillations can occur when the pre-flashover arc 14 is re-ignited.

Fig. 4 zeigt schließlich die Einschaltstellung des Trennschalters, bei der die beiden Widerstände 10 über ihre Stirnflächen 11 miteinander in Berührung stehen und bei der außerdem das in die Trennstrecke 3 mittels eines eigenen Antriebs eingeführte Kontaktrohr 4 das lsolierrohr 8 wieder in das Innere des Schaltstückes 1 zurückgedrückt hat. Das Kontaktrohr4 steht mittels seines stirnseitigen Wulstes 8 mit dem Rand 7 des Schaltstücks 1 in Kontakt, so daß die leitende Verbindung zwischen beiden Schaltstücken 1 und 2 hergestellt ist. Dabei kann die auftretende Stromwärme ungehindert von dem metallischen Kontaktrohr 4 nach außen abgegeben werden.4 finally shows the switch-on position of the isolating switch, in which the two resistors 10 are in contact with one another via their end faces 11 and in which, in addition, the contact tube 4, which is introduced into the isolating section 3 by means of its own drive, insulates the insulating tube 8 into the interior of the contact piece 1 pushed back. The contact tube 4 is in contact with the edge 7 of the contact piece 1 by means of its end bead 8, so that the conductive connection between the two contact pieces 1 and 2 is established. The heat of electricity that occurs can be released to the outside of the metal contact tube 4 without hindrance.

Beim Öffnen des Trennschalters verlaufen die Bewegungen der einzelnen Teile in umgekehrter Reihenfolge. Zunächst wird das Kontaktrohr 4 wieder in das Innere des Schaltstückes 2 hineingezogen und das Isolierrohr 8 tritt entsprechend in die Trennstrecke 3 hinaus und überbrückt diese bis auf den Abstand 12. Die beiden Widerstände 10 werden mittels ihrer eigenen Antriebe symmetrisch aus der Trennstrecke 3 zurückgezogen und schließlich läuft wenn sich die Widerstände 10 in Ruhelage befinden, das Isolierrohr 8 wieder aus der Trennstrecke 3 heraus, bis es sich in seine Ruhelage im Innern des Schaltstücks 1 befindet.When the disconnector is opened, the movements of the individual parts run in reverse order. First, the contact tube 4 is drawn back into the interior of the contact piece 2 and the insulating tube 8 accordingly enters the isolating section 3 and bridges it to the distance 12. The two resistors 10 are withdrawn symmetrically from the isolating section 3 by means of their own drives and finally runs when the resistors 10 are in the rest position, the insulating tube 8 again out of the isolating section 3 until it is in its rest position inside the contact piece 1.

Bei dem in den Fig. 5 bis 7 gezeigten anders ausgebildeten Trennschalter für eine metallgekapselte, druckgasisolierte Hochspannungsschaltanlage ist ein mit einer Feldelektrode 15 umgebenes, stehendes zylindrisches Schaltstück 16 vorhanden, das auf seiner Stirnfläche 17 einen bis zur Stirnfläche der Feldelektrode 15 hervorstehenden Ansatz 18 trägt. Gegenüber liegt eine andere Feldelektrode 15, die das bewegliche Schaltstück 19 umgibt. Dieses bewegliche Schaltstück 19 ist rohrförmig ausgebildet und steht in seiner Einschaltstellung mit der gegenüberliegenden Feldelektrode 15 in galvanischem Kontakt. Weiterhin ist im Innern des rohrförmigen Schaltstücks 19 das Isolierrohr 8 angeordnet, das einen eigenen Antrieb hat. Auf der der Trennfläche 3 zugewandten Stirnfläche ist das hochohmig halbleitend ausgebildete Isolierrohr 8 mit einem Metallkontakt 20 mit mittlerer Öffnung 21 versehen, der in Schließstellung die Verbindung zum stehenden Schaltstück 16 mit seinem Ansatz 18 herstellt.In the differently designed disconnector for a metal-encapsulated, pressurized gas-insulated high-voltage switchgear shown in FIGS. 5 to 7, there is a standing cylindrical switching element 16 surrounded by a field electrode 15, which carries on its end face 17 a projection 18 which protrudes up to the end face of the field electrode 15. Another field electrode 15, which surrounds the movable contact piece 19, lies opposite. This movable contact piece 19 is tubular and is in galvanic contact with the opposite field electrode 15 in its switched-on position. Furthermore, the insulating tube 8 is arranged in the interior of the tubular contact piece 19, which has its own drive. On the end face facing the separating surface 3, the high-resistance, semiconducting insulating tube 8 is provided with a metal contact 20 with a central opening 21, which in the closed position establishes the connection to the standing contact piece 16 with its extension 18.

Dieser Metallkontakt 20 ist mit einem Ende eines Widerstandes 22 verbunden, der auf seiner anderen Stirnfläche einen weiteren Metallkontakt 23 aufweist. Dieser Widerstand 22 liegt fest im Isolierrohr 8 und bewegt sich gemeinsam mit diesem.This metal contact 20 is connected to one end of a resistor 22, which has a further metal contact 23 on its other end face. This resistor 22 is fixed in the insulating tube 8 and moves together with it.

Außerdem ist noch ein zweiter gleich großer Widerstand 24 im Innern des Isolierrohres 8 angeordnet, der auf seiner der Trennstrecke zugewandten Stirnfläche mit einem federnden Metallkontakt 25 versehen ist, während sein anderes Ende mit einem eigenen nicht dargestellten Antrieb verbunden ist. Die Außendurchmesser der Widerstände 22, 24 sind jeweils kleiner als der Innendurchmesser des Isolierrohres 8.In addition, a second resistor 24 of the same size is arranged in the interior of the insulating tube 8, which is provided on its end face facing the isolating section with a resilient metal contact 25, while its other end is connected to its own drive, not shown. The outer diameters of the resistors 22, 24 are each smaller than the inner diameter of the insulating tube 8.

Die Fig. 5 zeigt die Ausschaltstellung des Trennschalters, d. h. das bewegliche rohrförmige Schaltstück 19 befindet sich ebenso wie das Isolierrohr 8 mit den beiden Widerständen 22 und 24 im Innern der Feldelektrode 15.Fig. 5 shows the off position of the circuit breaker, i. H. the movable tubular contact piece 19, like the insulating tube 8 with the two resistors 22 and 24, is located inside the field electrode 15.

Bei Beginn der Schaltbewegung wird zunächst das Isolierrohr 8 mittels seines eigenen Antriebs in die Trennstrecke 3 hineingeführt und nimmt dabei den mit ihm fest verbundenen ersten Widerstand 22 solange mit bis der elektrische Kontakt zwischen dem Metallkontakt 20 und dem stehenden Schaltstück 16 erfolgt. Auf diese Weise ist der Widerstand 22 mit dem stehenden Schaltstück 16 elektrisch verbunden und erhält dessen Potential. Die gesamte Trennstrecke 3 ist in dieser Lage von dem Isolierrohr 8 überbrückt. Dann wird der zweite Widerstand 24 im Innern des Isolierrohres 8 mittels seines eigenen Antriebes in die Trennstrecke 3 hineingeführt. Dieser Zustand ist in Fig. 6 dargestellt. Sobald sich der federnde Metallkontakt 25 des Widerstandes 24 dem Metallkontakt 23 des Widerstandes 22 genügend weit genähert hat, kann zwischen beiden ein Vorüberschlaglichtbogen auftreten, der jedoch dann nur über die beiden Widerstände gezündet ist und außerdem durch das Isolierrohr 8 an einem Abwandern zur Kapselung verhindert ist. Nachdem die beiden Widerstände 22 und 24 miteinander in Berührung getreten sind, wird dann über einen eigenen Antrieb mit dem beweglichen Schaltstück 19 die Trennstrecke 3 überbrückt und der Kontakt zur gegenüberstehenden Feldelektrode 15 hergestellt.At the start of the switching movement, the insulating tube 8 is first inserted into the isolating section 3 by means of its own drive and takes the first resistor 22 firmly connected to it until the electrical contact between the metal contact 20 and the stationary switching element 16 takes place. In this way, the resistor 22 is electrically connected to the standing contact piece 16 and maintains its potential. In this position, the entire isolating section 3 is bridged by the insulating tube 8. Then the second resistor 24 is guided inside the insulating tube 8 into the isolating section 3 by means of its own drive. This state is shown in Fig. 6. As soon as the resilient metal contact 25 of the resistor 24 has approached the metal contact 23 of the resistor 22 sufficiently far, a flashover arc can occur between the two, which, however, is then only ignited via the two resistors and is also prevented by the insulating tube 8 from migrating to encapsulation . After the two resistors 22 and 24 have come into contact with one another, the isolating path 3 is then bridged via a separate drive with the movable contact piece 19 and contact is made with the field electrode 15 opposite.

Bei der Einschaltbewegung kann die Bewegung des Isolierrohres 8 gemeinsam mit dem Widerstand 22 verhältnismäßig langsam sein. Der Widerstand 24 sollte sich dagegen schneller bewegen, damit eine kapazitive Überbrückung zwischen dem Widerstand 24 und dem beweglichen Schaltstück 19 vermieden wird.During the switch-on movement, the movement of the insulating tube 8 together with the resistor 22 can be relatively slow. The resistor 24, on the other hand, should move faster so that a capacitive bridging between the resistor 24 and the movable contact piece 19 is avoided.

Fig. 7 zeigt die Endstellung des geschlossenen Trenners.Fig. 7 shows the end position of the closed disconnector.

Beim Öffnen des Trennschalters erfolgt die Bewegung der einzelnen Teile in jeweils umgekehrter Reihenfolge. Erst wird das bewegliche Schaltstück 19 in seine Ausgangslage ins Innere der Feldelektrode 15 zurückgezogen. Dann wird der Widerstand 24 im Innern des Isolierrohres 8 ebenfalls zurück in seine Ausgangslage gebracht. Schließlich wird dann das Isolierrohr 8 gemeinsam mit dem Widerstand 22 aus der Trennstrecke 3 entfernt.When the disconnector is opened, the individual parts move in reverse order. First, the movable contact piece 19 is retracted into its starting position inside the field electrode 15. Then the resistor 24 inside the insulating tube 8 is also brought back into its starting position. Finally, the insulating tube 8 is then removed from the isolating section 3 together with the resistor 22.

Claims (11)

1. Disconnect switch for metal-clad pressure gas-insulated high voltage switching appratus, having two cylindrical contacts (1, 2, 4, 16, 19) which if necessary are enclosed by field electrodes and touch each other in the closed position, for which, during the switching operation, at least one contact moves along a longitudinal axis common to both, in which a movable insulating tube (8) is arranged inside a contact or a field electrode, which tube, during the switching operation, substantially bridges the isolation space between the contacts as long as the contacts are moved, characterised in that on the longitudinal axis there lie two movable resistors (10, 22, 24) electrically connected or connectible respectively to one of the contacts. (1, 2, 4,16, 19), approximately the same size and constructed to be of low inductance and low capacity, the outer dimensions of these resistors being smaller than the inner diameter of the insulating tube (8) and which are inserted into the isolation space (3) at the beginning of the switching movement, and also bridge this isolation space (3) after it has been at least substantially bridged by the insulating tube (8), before the opposite contacts (1,4,16,19) are brought into contact with each other or with the field electrodes (15).
2. Disconnect switch according to claim 1, characterised in that the resistors (10, 22, 24) have a thermally good conductive ceramic carrier.
3. Disconnect switch according to claim 1 or 2, characterised in that the resistors (24) carry metal contacts (25) of resilient construction on at least one of the front ends facing each other.
4. Disconnect switch according to claim 1, 2 or 3, characterised in that the drop in voltage at the resistors (10, 22, 24) amounts to approximately 1 to 2% of the operating voltage.
5. Disconnect switch according to claim 1, 2, 3 or 4, characterised in that each resistor (10, 22, 24) is guided with its own motive force symmetrically into the isolation space (3) when the insulating tube (8) has reached its final position in the isolation space (3) which leaves a clearance (12) with the opposite contact (2) or field electrode.
6. Disconnect switch according to claim 6, characterised in that the movable contact (4) pushes the insulating tube (8) out of the isolation space (3) during the switch-on operation.
7. Disconnect switch according to claim 6, characterised in that when the movable contact (4) returns, the insulating tube (8) is again brought back into its final position inside the isolating space (3) before the return movement of the resistors (10) begins.
8. Disconnect switch with a fixed and a driven contact according to claim 1, 2, or 4, characterised in that the first resistor (22) is fixedly arranged in the front end of the insulating tube (8) and is in contact with the opposite fixed contact (16) when the insulating tube (8) bridges the isolation space (3), and in that the second resistor (24) is movable within the insulating tube (8).
9. Disconnect switch according to claim 8, characterised in that the insulating tube (8) with the first resistor (22) is moved more slowly than the second resistor (24) in the isolation space (3).
10. Disconnect switch according to claim 1, characterised in that the insulating tube (8) is very highly resistantly semi-conductive.
EP84730086A 1983-09-01 1984-08-15 Isolating switch for a metal-clad pressurized-gas-insulated high-voltage switchgear Expired EP0136965B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833331819 DE3331819A1 (en) 1983-09-01 1983-09-01 DISCONNECTOR FOR METAL-ENCLOSED, COMPRESSED-GAS INSULATED HIGH-VOLTAGE SWITCHGEAR
DE3331819 1983-09-01

Publications (2)

Publication Number Publication Date
EP0136965A1 EP0136965A1 (en) 1985-04-10
EP0136965B1 true EP0136965B1 (en) 1987-03-18

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ID=6208154

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Application Number Title Priority Date Filing Date
EP84730086A Expired EP0136965B1 (en) 1983-09-01 1984-08-15 Isolating switch for a metal-clad pressurized-gas-insulated high-voltage switchgear

Country Status (8)

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US (1) US4539448A (en)
EP (1) EP0136965B1 (en)
JP (1) JPS6072119A (en)
BR (1) BR8404326A (en)
CA (1) CA1230629A (en)
DE (2) DE3331819A1 (en)
SU (1) SU1269754A3 (en)
ZA (1) ZA846830B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3405850A1 (en) 1984-02-16 1985-08-29 Siemens AG, 1000 Berlin und 8000 München DISCONNECTOR FOR METAL-ENCLOSED, COMPRESSED-GAS INSULATED HIGH-VOLTAGE SWITCHGEAR
DE3832171A1 (en) * 1988-07-01 1990-01-04 Licentia Gmbh DEVICE FOR RAPID SWITCHING ON AND OFF OF SMALL CURRENTS FOR DISCONNECTORS FROM V.I.S.
JP3437633B2 (en) * 1994-03-31 2003-08-18 株式会社日立製作所 Circuit breaker with parallel resistance
US6313641B1 (en) 1995-03-13 2001-11-06 Square D Company Method and system for detecting arcing faults and testing such system
DE19543815A1 (en) 1995-11-24 1997-05-28 Asea Brown Boveri Electrical switching device
US5933308A (en) * 1997-11-19 1999-08-03 Square D Company Arcing fault protection system for a switchgear enclosure
JP5188176B2 (en) * 2007-12-28 2013-04-24 三菱電機株式会社 Ground switch
DE102013210136A1 (en) * 2013-05-30 2014-12-04 Siemens Aktiengesellschaft Electrical switching device
EP3504726B1 (en) * 2016-08-26 2020-12-02 ABB Power Grids Switzerland AG Switch and method for disconnecting a switch

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FR1080200A (en) * 1953-06-17 1954-12-07 Merlin Gerin Circuit breaker contact protection device
CA678008A (en) * 1960-02-05 1964-01-14 Westinghouse Electric Corporation Circuit interrupters
FR1514265A (en) * 1967-01-09 1968-02-23 Merlin Gerin Resistance self-blowing switch
FR2057344A5 (en) * 1969-08-12 1971-05-21 Merlin Gerin
US3829707A (en) * 1973-02-09 1974-08-13 Allis Chalmers Gas insulated high voltage electrical transmission line with means for damping transients
IT1047627B (en) * 1974-10-01 1980-10-20 Reyrolle Parsons Ltd IMPROVEMENT IN RI SWITCHES FOR HIGH VOLTAGES
DE2704389C3 (en) * 1977-01-31 1980-06-26 Siemens Ag, 1000 Berlin Und 8000 Muenchen Disconnector for metal-enclosed high-voltage switchgear
JPS5559613A (en) * 1978-10-30 1980-05-06 Tokyo Shibaura Electric Co Gas breaker
FR2450501A1 (en) * 1979-03-02 1980-09-26 Alsthom Cgee CLOSING RESISTANCE INSERTION DEVICE OF A SWITCHING APPARATUS
GB2081976A (en) * 1980-08-08 1982-02-24 Ass Elect Ind Arc preventing in switches
DE3122442A1 (en) * 1981-06-02 1982-12-23 Siemens AG, 1000 Berlin und 8000 München DISCONNECTOR FOR HIGH VOLTAGE SYSTEMS
DE8119801U1 (en) * 1981-07-02 1984-11-29 Siemens AG, 1000 Berlin und 8000 München Contact system for compressed gas circuit breakers

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DE3462729D1 (en) 1987-04-23
CA1230629A (en) 1987-12-22
DE3331819A1 (en) 1985-03-21
BR8404326A (en) 1985-07-30
JPH027128B2 (en) 1990-02-15
ZA846830B (en) 1985-04-24
JPS6072119A (en) 1985-04-24
EP0136965A1 (en) 1985-04-10
SU1269754A3 (en) 1986-11-07
US4539448A (en) 1985-09-03

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