EP3786996A1 - Mécanisme de déconnexion pour dispositif de commutation haute tension - Google Patents

Mécanisme de déconnexion pour dispositif de commutation haute tension Download PDF

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Publication number
EP3786996A1
EP3786996A1 EP19194068.3A EP19194068A EP3786996A1 EP 3786996 A1 EP3786996 A1 EP 3786996A1 EP 19194068 A EP19194068 A EP 19194068A EP 3786996 A1 EP3786996 A1 EP 3786996A1
Authority
EP
European Patent Office
Prior art keywords
switching device
terminal stem
connector unit
current path
conducting leads
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.)
Pending
Application number
EP19194068.3A
Other languages
German (de)
English (en)
Inventor
Subbareddy Challa
Mariusz ROHMANN
Dirk SCHRÄDER
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 Energy Global GmbH and Co KG
Original Assignee
Siemens Energy Global GmbH and Co KG
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 Energy Global GmbH and Co KG filed Critical Siemens Energy Global GmbH and Co KG
Priority to EP19194068.3A priority Critical patent/EP3786996A1/fr
Publication of EP3786996A1 publication Critical patent/EP3786996A1/fr
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
    • H01H31/26—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 disclosure relates to switching devices such as switchgears. More particularly, the present disclosure relates to a horizontal center-break type disconnecting mechanism for a switching device.
  • a disconnecting mechanism for example, a disconnector is an assembly which, when installed in the head of a switchgear, has the function of assuring an interruption of voltage supply line to the switchgear when the disconnector is open, thus isolating the switchgear from electric supply.
  • a commonly known type of disconnector comprises a horizontal arrangement having a detachable current path, including a pair of movable arms, tubes, or blades.
  • the movable arms are detachably coupled to each other and can occupy two positions, namely a closed position wherein an electrical contact exists there-between via a main contact system, and an open position wherein the two arms rotate about an axis perpendicular to their length so as to break the electrical contact there-between.
  • the disconnector assembly also includes a pair of transfer contact systems for connecting the movable arms, at either ends, to the electricity supply and to the distribution bus bars of the switchgear.
  • the main contact configuration consists of female contacts, provided on one of the moving arms, comprising heli-coil springs 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 arm, which is generally made of an aluminium alloy.
  • a male contact is provided on the other moving arm 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 heli-coil springs used in the system also affect 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 transfer contact system provides rotary terminal contact jaws with flat spring exerting pressure on a terminal stem 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 therefore, 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.
  • EP2218084 discloses a disconnector for switching device having a transfer contact system for transferring electrical current from a rotatable terminal stem of the disconnector to the first movable current path arm wherein, the transfer contact system includes at least one flexible braided conducting lead rigidly fixed on both ends to the first current path arm. The flexible braided conducting lead being further in rigid contact with the terminal stem at a point along its length intermediate to the ends.
  • FIG 1 illustrates a front view of a switching device (not shown) such as a high voltage disconnector having a horizontal center-break type disconnecting mechanism 10 according to state of the art, as disclosed in EP2218084 .
  • the disconnector 10 has movable current path arms 12 and 14 made of an aluminium alloy material or a copper alloy material, having a rectangular cross-sectional profile.
  • the moving arms 12 and 14 are detachably coupled to each other and are capable of 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 arms 12 and 14 are in electrical contact with each other via a main contact system 16.
  • the moving blades 12 and 14 rotate about the axes 19 and 21 respectively in the indicated direction, such that electrical contact between them is broken.
  • 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 electricity supply and to the distribution bus bars via transfer contact systems 26 and 28 having rotatable terminal stems 30 and 32 respectively.
  • Each rotation unit (not shown) incorporates a rotation mechanism typically comprising two ball-bearings and is designed for high mechanical loads.
  • FIG 2 illustrates a cross-sectional view of a transfer contact system 26 or 28 according to state of the art disclosed in EP2218084 , of the horizontal center-break type disconnecting mechanism 10 shown in FIG 1 .
  • 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.
  • current is transferred from the rotatable terminal stem 30 to the moving blade 12 by one or more highly flexible braided conducting leads 36. Single or multiple flexible braided conducting leads 36 may be provided based upon the required amperage.
  • 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 36 ensures that the transfer contact system 26 does not have any relative rotational motion between the transfer contacts, that is, between the terminal stem 30 and the conducting leads 36, and between the conducting leads 36 and the moving blade 12.
  • the transfer contact system 26 or 28 disclosed in EP2218084 and described in description of FIGS 1-2 either fails to operate at high amperage, for example, above 2500 Amperes (A), or calls for a larger diameter of the terminal stem 30, for example, about 60mm due to a need for an increased size and/or quantity of the flexible conducting leads 36.
  • High amperage typically requires the terminal stem 30 to be increased radially to allow a higher number or a larger size of flexible conducting leads 36 to be accommodated there-under and supported by the washer 41.
  • this radial increase calls for a larger size of high voltage terminals or clamps which provide a connection to the busbars and effectively to the electricity supply.
  • the switching device disclosed herein achieves the aforementioned object by a connector unit rigidly attachable to the rotatable terminal stem of the disconnecting mechanism and configured so as to support numerous flexible conducting leads based on amperage rating requirements of the switching device.
  • the amperage rating is greater than or equal to 2500A.
  • the switching device disclosed herein comprises a first movable current path arm and a second movable current path arm. These arms form contacts to be opened and closed to break or make a circuit there-between.
  • the switching device comprises a disconnecting mechanism detachably coupling the first movable current path arm and the second movable current path arm for controlling transfer of electrical current therebetween.
  • the disconnecting mechanism comprises a transfer contact system for transferring electrical current from rotatable terminal stem(s) of the switching device to the movable current path arm(s).
  • the transfer contact system comprises a plurality of flexible braided conducting lead rigidly fixed on both ends to a current path arm.
  • the flexible braided conducting leads are in rigid contact with the terminal stem.
  • the transfer contact system comprises a connector unit rigidly attached to the terminal stem and configured so as to support one or more of the flexible conducting leads based on amperage rating of the switching device.
  • "connector unit” refers to an interface unit between the flexible conducting leads and the terminal stem. That is, the connector unit acts like a washer holding the flexible conducting leads in position and in connection with the terminal stem.
  • the flexible conducting leads are oriented downwards, that is, below the connector unit so as to maintain adequate space within the current path arm in which the transfer contact system is partially accommodated, and to allow free rotary movement of the terminal stem.
  • the connector unit is detachably coupled with the terminal stem.
  • the connector unit is an independent part which is affixed, for example, via studs, screw, bolts, or the like, to be detachably coupled to the terminal stem.
  • the connector unit is integrated with the terminal stem.
  • the connector unit is configured as an integral part of the terminal stem, for example, via casting, molding, welding, machining, etc., to have one end of the terminal stem as the connector unit.
  • the connector unit enhances stiffness of the terminal stem and eliminates requirements of additional screws and studs for connection to the terminal stem.
  • the connector unit is configured of a material selected based on the amperage rating of the switching device and/or the material of the terminal stem.
  • the connector unit is configured of at least aluminium or copper.
  • the terminal stem is typically made of aluminium or copper
  • the connector unit when made of the same materials ensures easy connection of the two metal parts resulting in a static conductive joint there-between.
  • an aluminium to aluminium contact provides a low overall resistance thereby, maintaining the current carrying capacity of the switching device.
  • the connector unit is made of an aluminium alloy providing mechanical advantages of being harder and stronger.
  • the connector unit has copper flashed aluminium surfaces for connection with a copper terminal stem. A copper flashed surface of the connector unit avoids requirements for bi-metallic washers which are typically used to control resistance offered by the tin-plated lugs when connected to the connector unit.
  • the connector unit precludes requirement for change in a cross-section of the terminal stem within current path to establish a rigid connection there-between whilst supporting high amperage.
  • the connector unit is configured to have at least a partially hexagonal surface allowing at least six flexible conducting leads to be connected thereto and thereby, suiting high amperage requirements, for example, allowing the current carrying capacity to be increased beyond 2500A.
  • the connector unit can have more than six faces to accommodate additional flexible conducting leads thereby, increasing the current carrying capacity further.
  • the current carrying capacity may be limited by the chosen flexible conducting leads and their connections, that is, the plated lugs used.
  • the switching device disclosed herein is a high voltage disconnector. More specifically, the switching device disclosed herein is a horizontal center-break type disconnector.
  • FIGS 3A-3C illustrate different views of a horizontal center-break type disconnecting mechanism 10 shown in FIG 1 , according to an embodiment of the present disclosure.
  • FIG 3A illustrates a cross-sectional view of a transfer contact system 26 or 28, according to an embodiment of the present disclosure, of the horizontal center-break type disconnecting mechanism 10 shown in FIG 1 .
  • the transfer contact system 26 is partially contained in a housing 42 shown in FIG 2 which is fixed to the moving blade 12 via studs 43 and 45, shown in FIG 2 , which respectively are installed on the sides 30A and 30B of the terminal stem 30.
  • the transfer contact system 26 comprises a terminal stem 30 which is rotatable around an axis 19 passing centrally there-through.
  • the transfer contact system 26 current is transferred from the rotatable terminal stem 30 to the moving blade 12 by a plurality of highly flexible braided conducting leads 36. Based on the required amperage, that is, above 2500A or below 2500A, quantity of the flexible braided conducting leads 36 can be varied.
  • the flexible braided conducting leads 36 are rigidly fixed to the moving blade 12 by tin plated lugs 38B.
  • the flexible braided conducting leads 36 extend upwards to be in rigid contact with the terminal stem 30 by being rigidly fixed to a hexagonal connector unit 44 by tin plated lugs 38A, according to the present disclosure.
  • FIG 3B illustrates a perspective view of the transfer contact system 26 shown in FIG 3A , having the hexagonal connector unit 44, according to the present disclosure.
  • FIG 3C illustrates an exploded view of the transfer contact system 26 shown in FIG 3A , having the hexagonal connector unit 44, according to the present disclosure.
  • the transfer contact system 26 comprises the terminal stem 30, the hexagonal connector unit 44, the flexible braided conducting leads 36, and the plated lugs 38.
  • a terminal stem head 30G is operably connected to the hexagonal connector unit 44 via grooves made on the hexagonal connector unit 44.
  • One or more connecting plates 30C, 30E, and 30F affix the hexagonal connector unit 44 to the terminal stem bottom 30D with help of studs 46.
  • the flexible braided conducting leads 36 are fixedly attached to the hexagonal connector unit 44 with help of the plated lugs 38 and specifically 38A as shown in FIG 3A .
  • the plated lugs 38 are screwed to the hexagonal connector unit 44 with help of studs 47.
  • about six flexible braided conducting leads 36 are attached on each side of the hexagonal connector unit 44 via the plated lugs 38 and studs 47.
  • the number of these flexible braided conducting leads 36 can be decreased.
  • FIG 4 illustrates a perspective view of a hexagonal connector unit 44 of the horizontal center-break type disconnecting mechanism 10 shown in FIGS 3A-3C , according to the present disclosure.
  • the hexagonal connector unit 44 comprises a cylindrical elongate member 44A rigidly attached to a hexagonal base member 44B.
  • the elongate member 44A connects with the terminal stem head 30G shown in FIG 3C .
  • the base member 44B provides an area for accommodating numerous flexible braided conducting leads 36 shown in FIGS 3A-3C thereby, supporting disconnecting mechanisms 10 having a higher amperage rating.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
EP19194068.3A 2019-08-28 2019-08-28 Mécanisme de déconnexion pour dispositif de commutation haute tension Pending EP3786996A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19194068.3A EP3786996A1 (fr) 2019-08-28 2019-08-28 Mécanisme de déconnexion pour dispositif de commutation haute tension

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19194068.3A EP3786996A1 (fr) 2019-08-28 2019-08-28 Mécanisme de déconnexion pour dispositif de commutation haute tension

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EP3786996A1 true EP3786996A1 (fr) 2021-03-03

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EP19194068.3A Pending EP3786996A1 (fr) 2019-08-28 2019-08-28 Mécanisme de déconnexion pour dispositif de commutation haute tension

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023128977A1 (fr) * 2021-12-27 2023-07-06 Ulusoy Elektri̇k İmalat Taahhüt Ve Ti̇caret Anoni̇m Şi̇rketi̇ Appareil d'interface d'appareillage de commutation de coupure de charge

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009074501A1 (fr) * 2007-12-11 2009-06-18 Siemens Aktiengesellschaft Sectionneur pour dispositif de commutation
CN201383457Y (zh) * 2009-04-03 2010-01-13 山东泰开隔离开关有限公司 一种高压隔离开关用接线座结构
CN202650942U (zh) * 2012-03-15 2013-01-02 湖南天鹰隔离开关有限公司 一种低阻抗高压隔离开关的刀闸接线盒装置
CN104134565A (zh) * 2013-07-16 2014-11-05 国家电网公司 用于高压隔离开关的接线座组件

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009074501A1 (fr) * 2007-12-11 2009-06-18 Siemens Aktiengesellschaft Sectionneur pour dispositif de commutation
EP2218084A1 (fr) 2007-12-11 2010-08-18 Siemens Aktiengesellschaft Sectionneur pour dispositif de commutation
CN201383457Y (zh) * 2009-04-03 2010-01-13 山东泰开隔离开关有限公司 一种高压隔离开关用接线座结构
CN202650942U (zh) * 2012-03-15 2013-01-02 湖南天鹰隔离开关有限公司 一种低阻抗高压隔离开关的刀闸接线盒装置
CN104134565A (zh) * 2013-07-16 2014-11-05 国家电网公司 用于高压隔离开关的接线座组件

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023128977A1 (fr) * 2021-12-27 2023-07-06 Ulusoy Elektri̇k İmalat Taahhüt Ve Ti̇caret Anoni̇m Şi̇rketi̇ Appareil d'interface d'appareillage de commutation de coupure de charge

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