EP3172753B1 - Klammer zum anschliessen einer niederstromvorrichtung an eine gasisolierte unterstation zur abschaltung dieser vorrichtung für eine funktionstestphase der unterstation - Google Patents

Klammer zum anschliessen einer niederstromvorrichtung an eine gasisolierte unterstation zur abschaltung dieser vorrichtung für eine funktionstestphase der unterstation Download PDF

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Publication number
EP3172753B1
EP3172753B1 EP15747112.9A EP15747112A EP3172753B1 EP 3172753 B1 EP3172753 B1 EP 3172753B1 EP 15747112 A EP15747112 A EP 15747112A EP 3172753 B1 EP3172753 B1 EP 3172753B1
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EP
European Patent Office
Prior art keywords
electrode
substation
envelope
contactor
moveable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP15747112.9A
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English (en)
French (fr)
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EP3172753A1 (de
Inventor
Samuel SOUCHAL
Jérémy RAVEL
Christophe Rech
Walter CHESNEAU
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.)
General Electric Technology GmbH
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General Electric Technology GmbH
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Publication date
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Publication of EP3172753A1 publication Critical patent/EP3172753A1/de
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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
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/24—Contacts characterised by the manner in which co-operating contacts engage by abutting with resilient mounting

Definitions

  • the invention relates to gas insulated electrical substations, which are installations located at the junction of transmission lines and / or electric power distribution, such as medium or high voltage lines.
  • a gas insulated substation generally designated by the acronym GIS stands for Gas Insulted Station, is a station comprising an envelope containing various electrical equipment.
  • This envelope which is typically metallic, is watertight and contains a dielectric gas, that is to say an insulating gas, such as SF6. It isolates electrically from the external environment the equipment it contains.
  • a dielectric gas that is to say an insulating gas, such as SF6. It isolates electrically from the external environment the equipment it contains.
  • These equipment which are at very high electrical voltages, are in particular conducting bars, circuit breakers and / or disconnectors operating at high or medium voltage.
  • Such a gas-insulated station is also equipped with voltage transformers to measure the voltage in the substation, and surge arresters to protect the substation from possible surges.
  • the voltage at the secondary stage of a voltage transformer is proportional to that of the primary stage while being much lower than it.
  • a voltage of 400 kV on the primary stage is thus reduced to 100V on the secondary stage.
  • a measurement of the voltage of the second stage thus makes it possible to know the voltage on the first stage.
  • the surge arrester provides the link between the substation and the earth that it connects by a series of varistors, so that in case of occurrence of a surge on the station, it is resorbed before to cause damage to the equipment of the station.
  • dielectric tests Prior to commissioning, dielectric tests are performed to verify that the item fulfills various operational criteria. The implementation of these tests requires that some apparatus of the station, in particular surge arresters and voltage transformers are disconnected.
  • disconnections require that the station is de-energized to drain the gas, disconnect the concerned conductors, close the envelope portion containing the other equipment, and refill it with insulating gas.
  • the unit When the test has been performed, the unit must be powered down again, drain the gas, reconnect each voltage transformer and each surge arrester before refilling the gas envelope.
  • the emptying and filling operations are further complicated by the fact that the insulating gas is harmful to the environment.
  • DE 10 2010 060696 discloses a three-phase gas-insulated transformer having an envelope containing three switches each including a base connected to a member resembling a conductive bar, the base carrying a rotatable contact blade.
  • the blade is movable between an electrically closed position where its end is in contact clamped between two lamellae of a fixed contact connected to a winding of the transformer, and an electrically open position where it is retracted into the base.
  • This blade which can also occupy a third position of contact with a second fixed contact, is moved by an actuator located outside the envelope, and to which it is connected by an axis passing through the envelope.
  • the gas-insulated station can integrate devices for temporarily disconnecting, off, the equipment to be disconnected to perform the operational tests of the station prior to its commissioning.
  • the invention also relates to a splice as defined above, further comprising a support rigidly secured to one end of the envelope portion and to the electrode for supporting the electrode.
  • the invention also relates to a splice as defined above, further comprising a support rigidly secured to one end of the envelope portion and carrying the electrode.
  • the splint according to the invention further comprises a sliding-mounted button at the free end of the movable contactor with a spring reminding continuously this key to an extended position so that it exerts a straight support on the fixed contact when the movable contactor is in the closed position .
  • the invention also relates to a splice as defined above, in which the movable contactor is significantly closer to the envelope when it occupies its open position than when it occupies its closed position.
  • the invention also relates to a splice as defined above, wherein the arm is connected to the movable contactor being rigidly secured to the movable switch, and wherein the arm extends along the axis of rotation of the movable contactor.
  • the invention also relates to a gas-insulated station comprising at least one low-current switchgear, such as a voltage transformer or a surge arrester, and in which this apparatus is connected to a busbar of the substation via a splice as defined above.
  • a low-current switchgear such as a voltage transformer or a surge arrester
  • the invention is based on the finding that the voltage transformer and lightning arrester apparatus are traversed by a low current when they operate, and that the disconnection of these devices for an operational test is performed without voltage, and that these are grounded during the test.
  • a voltage transformer comprises a primary winding connected on the one hand to a busbar of the station, for example by means of a capacitor, and on the other hand to ground.
  • This transformer is traversed by a current of derisory intensity because it is a voltage measuring transformer therefore having a substantially zero consumption.
  • a surge arrester connects the station to earth by varistors, so it is also crossed by a low intensity leakage current when absorbing a surge. This current is zero in the absence of overvoltage.
  • the current flowing through them is low: it is of an order of magnitude less than one ampere.
  • the means for disconnecting in the test phase of such equipment are in the form of a splice having a substantially zero breaking capacity, and having a mobile switch located on the equipment side to be grounded during the test. In the open state, this moving contact can be close to the envelope without the risk of starting an electric arc during the test.
  • This electrical splice has a breaking capacity lower than that of a disconnector whose breaking capacity allows it to withstand residual currents in the opening phase.
  • the figure 1 shows in its lower part a station portion 1 having a conductor bar 2 which is under high voltage when the station is in operation and also during the performance of the operational tests prior to commissioning.
  • This conductive bar 2 which here extends horizontally along an axis normal to the plane of the figure 1 , and that appears in the figure 2 being identified by AX1, is surrounded by a sealed envelope 3.
  • This envelope 3 which is metallic and generally tubular in shape to surround the conductive bar 2 is here represented only partially. It encloses an insulating gas to avoid the formation of electric arcs between the bar and the envelope.
  • This bar 2 is equipped with a connection terminal 4, which protrudes from its upper face to extend perpendicular to this bar 2 which supports it, upwards in the figures.
  • connection terminal 4 protrudes from the lower portion 3 of the envelope through an upper opening 6 thereof.
  • This terminal 4 is surrounded by another sealed casing section, identified by 8, having a general shape of a cylinder trunk, extending perpendicularly to the lower portion 3.
  • the lower edge 9 of the section d The cylinder trunk shell 8 is thus sealingly attached to the opening 6.
  • This portion of cylinder trunk shell 8 extends vertically far beyond the end 7 of the terminal 4. It carries at its upper end 11 in the form of a circular edge, an electrically insulating support 12, of shape here generally conical, which maintains an electrode 13 extending on either side of the support 12.
  • This support 12 may comprise openings for passing the insulating gas, or be closed to form a sealed barrier to compartmentalize the envelope of the post.
  • This electrode 13 extends in the envelope section 8 to the terminal 4, the terminal 4 and the electrode 13 having both forms of revolution. They extend in the extension of one another, along an axis AY normal to the axis AX1, and they have their ends spaced apart from one another in the central region of the section of envelope 8.
  • the free end 14 of the electrode 13 thus faces the free end 7 of the terminal 4.
  • the free end 14 of the electrode 13 is equipped with an electric switch 16 movable between a connection position, as in FIG. figure 2 , where it extends in the space between the ends 7 and 14 to electrically connect them to one another, and a disconnection position, as in the figure 1 where it is folded to leave this empty space.
  • This contactor 16 has an end which is articulated on the end 14 of the electrode 13.
  • This end has a double clevis shape, comprising two wings 17 and 18 extending on either side of the single clevis that constitutes the end 14 of the electrode 13.
  • This rotating arm 19 which has an axis shape is rigidly secured to the wings of the double yoke of the movable contactor 16. It thus constitutes both an axis of articulation of the movable contactor 16 on the electrode 13 and a maneuvering member of this mobile contactor 16.
  • this rotating arm 19 made of insulating material, passes through an opening 21 of the envelope section 8 to be accessible and operable from outside the envelope.
  • the movable contactor 16 As visible in the figure 2 when the movable contactor 16 is in the connection position, it extends in the space separating the terminal 4 and the electrode 13 to join them together by prolonging them.
  • the terminal with the electrode and the movable contact 16 then constitute an assembly generally having a shape of revolution about the axis AY being located at a distance from the envelope 8. In fact, there is no risk of ignition of an electric arc.
  • the free end of the contactor 16 is provided with a contact key 22, movable in translation along the main direction of the contactor.
  • This key 22 is secured by a return spring continuously tending to pull it out so that it protrudes from the free end of the moving contactor 16.
  • This movable key ensures that a frank contact is established in all circumstances with the end 7 of the terminal 4, when the movable contactor 16 is placed in connection position as in the figure 2 .
  • the movable contactor 16 As visible in the figure 1 when the movable contactor 16 is in the disconnected position, it extends perpendicularly to the axis AY of the terminal 4 and the electrode 13, so that its free end is then at a short distance from the inner surface of the section envelope 8.
  • this mobile contactor 16 is not energized, so that it does not can not initiate an electric arc despite its low proximity to the envelope 8. During a test phase, it is only the terminal 4 which is under high voltage.
  • the invention takes advantage of the fact that it aims to allow the disconnection only for test phases of low current devices that are grounded including during these tests.
  • the splint according to the invention constitutes a small-sized member that can be associated with any low current switchgear to be disconnected and which is grounded in the test phase of the station it equips.
  • the station is designed with fishplates according to the invention for each low-current switchgear to be disconnected and grounded in test phase.

Landscapes

  • Gas-Insulated Switchgears (AREA)

Claims (5)

  1. Lasche zur Verbindung mit einer Stromschiene (2) einer gasisolierten Schaltanlage, einer geerdeten Ausrüstung mit schwachem Strom, wobei sich diese Lasche dahingehend betätigen lässt, wenn sie spannungslos ist, dass sie die Ausrüstung im Hinblick auf eine Testbetriebsphase der Anlage trennt, wobei diese Lasche Folgendes umfasst:
    - eine Elektrode (13), die dafür bestimmt ist, mit der Ausrüstung verbunden zu werden, wobei diese Elektrode (13) ein freies Ende aufweist, das einen Schütz (13) trägt, der drehbar ist zwischen einer geschlossenen Stellung, in der er sich in der Verlängerung dieser Elektrode (13) erstreckt, sodass sein freies Ende an einer Klemme (4) der Stromschiene (2) anliegt, und einer geöffneten Stellung der Trennung, in der sein freies Ende beabstandet von der Region ist, die die ihn tragende Elektrode (13) verlängert;
    - eine Taste (22), die gleitend am freien Ende des beweglichen Schützes (16) montiert ist, mit einer Feder, die diese Taste (22) kontinuierlich in eine ausgefahrene Stellung vorspannt, damit sie einen klaren Druck auf den feststehenden Kontakt (4) ausübt, wenn sich der bewegliche Schütz (16) in der geschlossenen Stellung befindet;
    - einen Kapselungsabschnitt (8), der die Elektrode und den beweglichen Kontakt, den sie trägt, umschließt;
    - einen Arm (19), der mit dem beweglichen Schütz (16) verbunden ist und abgedichtet durch den Kapselungsabschnitt (8) geführt wird, sodass er von außerhalb der Kapselung betätigt werden kann, um den beweglichen Schütz (16) von einer Stellung in die andere zu bringen.
  2. Lasche nach Anspruch 1, die weiter einen Träger (12) umfasst, der mit einem Ende des Kapselungsabschnitts (8) und der Elektrode (13) starr verbunden ist, um diese Elektrode zu tragen.
  3. Lasche nach Anspruch 1 oder 2, wobei sich der bewegliche Schütz (16) der Kapselung (8) näher ist, wenn er sich in der geöffneten Stellung befindet, als wenn er sich in der geschlossenen Stellung befindet.
  4. Lasche nach einem der Ansprüche 1 bis 3, wobei der Arm (19) mit dem beweglichen Schütz (16) verbunden ist, indem er mit diesem beweglichen Schütz starr verbunden ist, und wobei sich dieser Arm (19) längs der Drehachse des beweglichen Schützes (16) erstreckt.
  5. Gasisolierte Schaltanlage mit zumindest einer Ausrüstung mit schwachem Strom, wie einem Spannungstransformator oder einem Überspannungsabieiter, wobei diese Ausrüstung über eine Lasche nach einem der Ansprüche 1 bis 4 mit einer Stromschiene (2) der Schaltanlage verbunden ist.
EP15747112.9A 2014-07-24 2015-07-21 Klammer zum anschliessen einer niederstromvorrichtung an eine gasisolierte unterstation zur abschaltung dieser vorrichtung für eine funktionstestphase der unterstation Active EP3172753B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1457135A FR3024294B1 (fr) 2014-07-24 2014-07-24 Eclisse de connexion a un poste isole au gaz d'un appareillage a faible courant permettant de deconnecter cet appareillage pour une phase de test operationnel du poste
PCT/EP2015/066637 WO2016012444A1 (fr) 2014-07-24 2015-07-21 Eclisse de connexion à un poste isolé au gaz d'un appareillage à faible courant permettant de déconnecter cet appareillage pour une phase de test operationnel du poste

Publications (2)

Publication Number Publication Date
EP3172753A1 EP3172753A1 (de) 2017-05-31
EP3172753B1 true EP3172753B1 (de) 2019-03-13

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EP15747112.9A Active EP3172753B1 (de) 2014-07-24 2015-07-21 Klammer zum anschliessen einer niederstromvorrichtung an eine gasisolierte unterstation zur abschaltung dieser vorrichtung für eine funktionstestphase der unterstation

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EP (1) EP3172753B1 (de)
FR (1) FR3024294B1 (de)
WO (1) WO2016012444A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016169031A1 (zh) * 2015-04-23 2016-10-27 Abb技术有限公司 电压互感器隔离装置和气体绝缘开关设备
DE102020200986B4 (de) * 2020-01-28 2023-05-11 Siemens Energy Global GmbH & Co. KG Spannungswandler

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI228339B (en) * 2002-11-06 2005-02-21 Mitsubishi Electric Corp Metal-enclosed switchgear
JP5546338B2 (ja) * 2010-04-30 2014-07-09 三菱電機株式会社 ガス絶縁計器用変圧器
DE102011007900A1 (de) * 2011-04-21 2012-10-25 Siemens Aktiengesellschaft Spannungswandler für eine Schaltanlage
JP5452555B2 (ja) * 2011-08-29 2014-03-26 株式会社日立製作所 スイッチギヤ及びスイッチギヤの操作方法

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Publication number Publication date
WO2016012444A1 (fr) 2016-01-28
FR3024294A1 (fr) 2016-01-29
FR3024294B1 (fr) 2018-04-06
EP3172753A1 (de) 2017-05-31

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