EP2218084B1 - Sectionneur pour dispositif de commutation - Google Patents

Sectionneur pour dispositif de commutation Download PDF

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Publication number
EP2218084B1
EP2218084B1 EP08859084A EP08859084A EP2218084B1 EP 2218084 B1 EP2218084 B1 EP 2218084B1 EP 08859084 A EP08859084 A EP 08859084A EP 08859084 A EP08859084 A EP 08859084A EP 2218084 B1 EP2218084 B1 EP 2218084B1
Authority
EP
European Patent Office
Prior art keywords
contact
switching device
current path
transfer
path tube
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.)
Not-in-force
Application number
EP08859084A
Other languages
German (de)
English (en)
Other versions
EP2218084A1 (fr
Inventor
Ramamurthy Palakurthy
Bernd RÄTH
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
Priority to PL08859084T priority Critical patent/PL2218084T3/pl
Publication of EP2218084A1 publication Critical patent/EP2218084A1/fr
Application granted granted Critical
Publication of EP2218084B1 publication Critical patent/EP2218084B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
    • H01H31/26—Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch
    • H01H31/28—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
    • H01H1/58—Electric connections to or between contacts; Terminals
    • H01H1/5822—Flexible connections between movable contact and terminal

Definitions

  • the present invention relates to switchgears, particularly to a horizontal center-break type disconnecting mechanism for a switching device.
  • a disconnector is an assembly which, when installed in the head of a switchboard, has the function of assuring the interruption of the voltage supply line to the switchboard when the disconnector is open, thus isolating the switchboard from electric supply.
  • a commonly known type of disconnector comprises a horizontal arrangement having a detachable current path, including pair of movable tubes or blades. The two moving blades are detachably coupled to each other and can occupy two positions, namely a closed position wherein the blades are in electrical contact with each other via a main contact system, and an open position wherein the two blades rotate about an axis perpendicular to their length such that the electrical contact between them is broken.
  • the disconnector assembly also includes a pair of transfer contact systems for connecting the moving blades, at either ends, to the electricity supply and to the distribution bus bars of the switchboard.
  • the main contact configuration consists of female contacts, provided on one of the moving blades, comprising helicoil springs (typically made of stainless steel) to exert a positive contact pressure for transfer of current and also to ensure proper contact to withstand to the electro-dynamic forces during the flow of fault current in the system.
  • the female contacts are housed in the moving blade, which is generally made of an aluminum alloy.
  • a male contact is provided on the other moving blade, and is formed out of two copper sheets and electro plated with silver coat to improve the conductivity and thermal withstanding capability of contacts.
  • this existing design of the main contact system has several disadvantages.
  • the contacts are rubbed against each other during the course of motion of contacts, and requires lubrication to withstand to the frictional resistance. Unless this is lubricated at frequent intervals the silver layer gets eroded causing the damage to the contact. Further, the stainless steel helicoil springs used in the system also affects the functioning of the main contact system because, if the springs set permanently due to any reason over a period of time, the contact pressure will be lost causing the temperature rise thus burning the contact system itself.
  • the existing design provides rotary terminal contact jaws with flat spring exerting pressure on a terminal stem (typically made of copper) to achieve the proper contact to transfer the current.
  • the contacts are typically silver plated and during the rotary motion while open-close operation of the disconnector the silver face gets rubbed against the terminal stem. It is hence necessary to maintain a proper pressure of contacts on to the terminal stem, in the absence of which, the silver layer existing on terminal stem as well as on terminal jaws gets eroded, thus reducing the thermal capability of the contacts and increasing the temperature rise beyond the specification limits at transfer point.
  • the transfer contacts are not lubricated at frequent intervals, the contact surface experiences a lot of friction, causing the damage to the silver plating of contacts which reduces the functionality and life the contacts.
  • a ⁇ switching device having a disconnecting mechanism for detachably coupling a first and a second movable current path tube for controlling transfer of electrical current therebetween, said switching device comprising:
  • the underlying idea of the present invention is to provide a switching device having a horizontal center-break type disconnecting mechanism wherein the transfer contact system does not have any relative rotary motion between the transfer contacts.
  • transfer of current takes place through the flexible braided conducting lead, which is rigidly fixed to the movable current path tube and to the terminal stem.
  • said at least one flexible braided conducting lead is formed from copper and comprises a tin plating. The above provides particularly improved conductivity for the flexible braided conducting lead.
  • the switching device comprises a plurality of flexible braided conducting leads rigidly fixed on both ends to said first movable current path tube by tin plated lugs.
  • said terminal stem is made of an aluminum alloy.
  • the switching device further comprises a main contact system adapted for electrically coupling said first and second movable current path tubes, said main contact system further comprising:
  • said contact fingers and contact block are formed from copper and coated with a material comprising silver, or graphite, or combinations thereof.
  • the coatings of silver & graphite improves the properties of conductivity and contact self lubrication respectively.
  • a disconnector 10 for a switching device having movable current path tubes 12 and 14.
  • the current path tubes 12 and 14 are moving blades made of an aluminum alloy material, and having a rectangular cross-sectional profile.
  • the moving blades 12 and 14 may also be made of a copper alloy.
  • the moving blades 12 and 14 are detachably coupled to each other and are capable to rotation about the axes 19 and 21 respectively to occupy two positions, namely a closed position and an open position.
  • the configuration shown in FIG 1 represents the closed position wherein the moving blades 12 and 14 are in electrical contact with each other via a main contact system 16.
  • the main contact system 16 comprises a female contact interface 18, fixed to the moving blade 12 by studs 24, and a male contact interface 20, fixed to the moving blade 14 by studs 22.
  • Each of the moving blades 12 and 14 are connected to the to the electricity supply and to the distribution bus bars via transfer contact systems 26 and 28 having rotatable terminal stems 30 and 32 respectively.
  • the terminal stems 30 and 32 extend upwards from the moving blades 12 and 14 and are each further connected to a rotation unit (not shown) adapted for actuating rotation of the terminal stems 30 and 32 about the axes 19 and 21 respectively.
  • Each rotation unit (not shown) incorporates a rotation mechanism typically comprising two ball-bearings and is designed for high mechanical loads.
  • FIG 2 is a cross-sectional view illustrating the components of the transfer contact system 26. It may be appreciated that a similar description may apply to the transfer contact system 28. As shown, the transfer contact system 26 is partially contained in a housing 42 which is fixed to the moving blade 12 via studs 43 and 45. Insulation of the terminal stem 30 is provided by bushings 39, typically formed from nylon. In the transfer contact system 26, current is transferred from the rotatable terminal stem 30 to the moving blade 12 by one or more highly flexible braided conducting leads 36. In the illustrated embodiment, the conducting leads 36 are made of copper and comprise a tin plating. Unlike in existing designs, in this embodiment no silver coating is required. Silver plating incurred additional material cost in the existing designs. Further consequently, this embodiment does away with erosion that generally takes place in the silver coating. Also, the terminal stem 30 in the shown example is made of an aluminum alloy material, whereby no silver plating is required, thus further reducing material cost.
  • the flexible braided conducting leads 36 are rigidly fixed on both ends to the moving blade 12 by tin plated lugs 38 and 40.
  • the flexible braided conducting leads 36 extend in a generally horizontal orientation, extending upwards to be in rigid contact with the terminal stem 30 via washer 41.
  • the point of rigid contact of the flexible conducting leads 36 with the terminal stem 30 is about the center of the length of the flexible conducting leads 36. This provides two parallel paths for transfer of current between the terminal stem 30 and the moving blade 12, thus enhancing the current carrying capacity of the transfer contact system 26.
  • This design employing flexible conducting leads ensures that the transfer contact system 26 does not have any relative rotational motion between the transfer contacts (between the terminal stem 30 and the conducting leads 36, and between the conducting leads 36 and the moving blade 12).
  • the above-described design advantageously provides easy assembly of the components and cheaper manufacturing obviating the need for CNC. Further, the design maximizes surface dissipation of heat. Unlike in existing designs, the illustrated embodiment obviates the need for terminal jaws or any contact pressure since both ends are rigidly fixed of the conducting leads 36 are fixed. Further, since the conducting leads 36 are flexible, no helicoil springs are required, thus obviating any manufacturing inconsistency or damage to the transfer contacts.
  • a female contact interface 18 comprises fingers 50 and 52 fitted in finger blocks 53.
  • the contact fingers 50 and 52 are typically made of copper.
  • the male contact interface 20 includes a contact block 54 that fits between the contact fingers 50 and 52 during closed operation of the disconnector.
  • the male contact block 54 has a V-groove around its circumference, such that the contact block 54 has two contact points 56 and 58 for transfer of current for each finger when the disconnector is in a closed position.
  • the male contact block 54 may also be formed of copper.
  • the contact fingers 50 and 52 and the male contact block 54 are may be with silver & graphite for improving the conductivity and contact self lubrication respectively.
  • the above advantageously reduces the maintenance and servicing of the main contact system. Further, in the illustrated embodiment, no helicoil stainless steel springs are required, and hence, no damage due to malfunctioning of springs takes place.
  • the present invention deals with a switching device having a disconnecting mechanism for detachably coupling a first and a second movable current path tube, for controlling transfer of electrical current therebetween.
  • the switching device comprises a transfer contact system for transferring electrical current from a rotatable terminal stem to the first movable current path tube.
  • the transfer contact system comprises at least one flexible braided conducting lead rigidly fixed on both ends to the first current path tube.
  • the flexible braided conducting lead is further in rigid contact with the terminal stem at a point along its length intermediate to said ends.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Keying Circuit Devices (AREA)
  • Electronic Switches (AREA)

Claims (6)

  1. Dispositif de commutation ayant un mécanisme de déconnexion (10) pour coupler de façon détachable un premier (12) et un deuxième (14) tube mobile de passage de courant pour commander un transfert de courant électrique entre ceux-ci, ledit dispositif de commutation comprenant :
    - un système de contact de transfert (26) pour transférer un courant électrique d'une tige terminale (30) rotative jusqu'au premier tube mobile de passage de courant (12), ledit système de contact de transfert (26) comprenant en outre au moins un conducteur tressé flexible (36) fixé de façon rigide sur les deux extrémités audit premier tube de passage de courant (12), ledit au moins un conducteur tressé flexible (36) étant en outre en contact rigide avec ladite tige terminale (30) à un point sur sa longueur à mi-chemin desdites extrémités.
  2. Dispositif de commutation selon la revendication 1, dans lequel ledit au moins un conducteur tressé flexible (36) est formé de cuivre et comprend un étamage.
  3. Dispositif de commutation selon l'une quelconque des revendications précédentes, comprenant une pluralité de conducteurs tressés flexibles (36) fixés de façon rigide sur les deux extrémités audit premier tube mobile de passage de courant (12) par des cosses étamées (38, 40).
  4. Dispositif de commutation selon l'une quelconque des revendications précédentes, dans lequel ladite tige terminale (30) est constituée d'un alliage d'aluminium.
  5. Dispositif de commutation selon l'une quelconque des revendications précédentes, comprenant en outre un système de contact principal (16) adapté à coupler électriquement lesdits premier (12) et deuxième (14) tubes mobiles de passage de courant, ledit système de contact principal (16) comprenant en outre :
    - une interface de contact femelle (18) associée avec le premier tube mobile de passage de courant (12) et comprenant une paire de doigts de contact (50, 52), et
    - une interface de contact mâle (20) associée avec le deuxième tube mobile de passage de courant (14) et comprenant un bloc de contact (54) ayant une rainure circonférentielle autour de sa surface, adapté à créer deux points de contact (56, 58) pour un transfert de courant électrique jusqu'à l'interface de contact femelle (18).
  6. Dispositif de commutation selon la revendication 5, dans lequel lesdits doigts de contact (50, 52) et ledit bloc de contact (54) sont formés de cuivre et revêtus d'un matériau comprenant de l'argent, ou du graphite, ou des combinaisons de ceux-ci.
EP08859084A 2007-12-11 2008-12-04 Sectionneur pour dispositif de commutation Not-in-force EP2218084B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08859084T PL2218084T3 (pl) 2007-12-11 2008-12-04 Odłącznik do urządzenia łączącego

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN1664KO2007 2007-12-11
PCT/EP2008/066744 WO2009074501A1 (fr) 2007-12-11 2008-12-04 Sectionneur pour dispositif de commutation

Publications (2)

Publication Number Publication Date
EP2218084A1 EP2218084A1 (fr) 2010-08-18
EP2218084B1 true EP2218084B1 (fr) 2011-05-18

Family

ID=40427913

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08859084A Not-in-force EP2218084B1 (fr) 2007-12-11 2008-12-04 Sectionneur pour dispositif de commutation

Country Status (7)

Country Link
EP (1) EP2218084B1 (fr)
CN (1) CN101896986B (fr)
AT (1) ATE510290T1 (fr)
ES (1) ES2366772T3 (fr)
PL (1) PL2218084T3 (fr)
RU (1) RU2479881C2 (fr)
WO (1) WO2009074501A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104134565B (zh) * 2013-07-16 2016-05-25 国家电网公司 用于高压隔离开关的接线座组件
US10991519B2 (en) * 2018-04-11 2021-04-27 Abb Power Grids Switzerland Ag Flexible conductor for disconnector and the disconnector thereof
EP3786996A1 (fr) * 2019-08-28 2021-03-03 Siemens Energy Global GmbH & Co. KG Mécanisme de déconnexion pour dispositif de commutation haute tension

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1404609A (en) * 1920-01-09 1922-01-24 Hiram S Hearn Transmission switch
US1906505A (en) * 1929-04-29 1933-05-02 Delta Star Electric Co Switch
US1949019A (en) * 1929-05-29 1934-02-27 Railway & Industrial Eng Co High-tension switch
FR1024115A (fr) * 1949-01-29 1953-03-27 Licentia Gmbh Sectionneur pour haute tension en particulier pour montage à l'air libre
US2791651A (en) * 1956-03-21 1957-05-07 Kearney James R Corp Electrical switches
US3627939A (en) * 1970-06-19 1971-12-14 Kearney National Canada Ltd Electric switch
US5293012A (en) * 1992-10-28 1994-03-08 E Manufacturing Company, Inc. Disconnecting switch
US5319166A (en) * 1993-01-25 1994-06-07 General Electric Company Molded case circuit breaker modular contact arm arrangement
RU2127006C1 (ru) * 1996-12-10 1999-02-27 Акционерное общество закрытого типа НПК "Электрические технологии" Горизонтально-поворотный разъединитель
FR2774210B1 (fr) * 1998-01-27 2000-03-17 Schneider Electric Ind Sa Piece de contact mobile pour un disjoncteur a haute tension, et a auto-expansion
JP4046308B2 (ja) * 1999-03-11 2008-02-13 株式会社高岳製作所 水平一点切断路器
CN2935438Y (zh) * 2006-07-20 2007-08-15 郑建强 一种高压隔离开关的低阻导电装置

Also Published As

Publication number Publication date
ES2366772T3 (es) 2011-10-25
CN101896986A (zh) 2010-11-24
WO2009074501A1 (fr) 2009-06-18
CN101896986B (zh) 2013-05-29
ATE510290T1 (de) 2011-06-15
RU2010128569A (ru) 2012-01-20
RU2479881C2 (ru) 2013-04-20
PL2218084T3 (pl) 2011-10-31
EP2218084A1 (fr) 2010-08-18

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