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EP3886133A1 - Agencement d'interconnexion pour un dispositif de commutation - Google Patents

Agencement d'interconnexion pour un dispositif de commutation Download PDF

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Publication number
EP3886133A1
EP3886133A1 EP20200515.3A EP20200515A EP3886133A1 EP 3886133 A1 EP3886133 A1 EP 3886133A1 EP 20200515 A EP20200515 A EP 20200515A EP 3886133 A1 EP3886133 A1 EP 3886133A1
Authority
EP
European Patent Office
Prior art keywords
interlink
adjusting member
arrangement
stroke
stroke adjusting
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.)
Granted
Application number
EP20200515.3A
Other languages
German (de)
English (en)
Other versions
EP3886133B1 (fr
Inventor
Abhishek KALE
Lokesh Kumar
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP3886133A1 publication Critical patent/EP3886133A1/fr
Application granted granted Critical
Publication of EP3886133B1 publication Critical patent/EP3886133B1/fr
Active 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
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/666—Operating arrangements
    • H01H33/6661—Combination with other type of switch, e.g. for load break switches
    • 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
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/666—Operating arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
    • H01H2003/323—Driving mechanisms, i.e. for transmitting driving force to the contacts the mechanisms being adjustable
    • 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

Definitions

  • the present disclosure relates to switching devices such as circuit breakers. More particularly, the present disclosure relates to a physical interlink between a circuit breaker and a grounding switch.
  • grounding or earthing transformers are an important component of any power network. More particularly, grounding transformers are essential for renewable power generator plants, for example, in large multi-turbine wind farms where the substation transformer frequently provides a sole earthing source for distribution system.
  • a grounding transformer placed on a wind turbine string provides a ground path in an event when the string becomes isolated from the system ground provided by the substation transformer.
  • a ground fault on a collector cable causes the substation circuit breaker to open and the wind turbine string becomes isolated from the system ground source.
  • the wind turbines do not always detect this fault or the fact that the string is isolated and ungrounded. As a result, the generators continue to energize the collector cable, and the voltages between the un-faulted cables and the ground rise far above the normal voltage magnitude. This results in a staggering increase in operational costs.
  • FIG 1A illustrates a wind power generation system 100, according to the state of the art.
  • the wind power generation system 100 has a string of wind turbines WTG1-WTGX each of which are connected to a medium voltage circuit breaker 101 and a grounding transformer 102, via respective line transformers 103A-103X.
  • This wind power generation system 100 is then connected to a step-up transformer 104 to step up the voltage suitable for power transmission over the transmission system 105.
  • FIG 1B illustrates a wind power generation system 100 comprising a switching device 106 having a combined functionality of circuit breaking and ground switching, according to the state of the art.
  • FIG 1B discloses an embodiment of the wind power generation system 100 shown in FIG 1A .
  • the circuit breaker 101 and the grounding transformer 102 are integrated into a single switching device 106.
  • the switching device 106 performs the switching and grounding through a combined medium voltage circuit breaker and a grounding vacuum switch thereby, eliminating the grounding transformer 102.
  • a switching stroke of both circuit breaker and ground switch it is required that a switching stroke of both circuit breaker and ground switch must set independent of one another.
  • the switching stroke refers to a gap between a fixed contact and a moving contact of the switching device such as a vacuum interrupter when it is in an open condition.
  • This stroke is a function of the time delay required for conducting the switching operation. For example, greater the time delay larger is the stroke.
  • a drive connection rod of the switching device is used for stroke adjustment however, this does not allow for independent stroke adjustment.
  • a switching device having a first interrupter unit, that is, a circuit breaker, providing a path for current flow therethrough in a closed state and interrupting the current flow in an open state, and a second interrupter unit operably connected to the first interrupter unit allowing the current flow through the first interrupter unit in an open state and grounding the switching device in a closed state, that is, acting as a grounding switch, that addresses the aforementioned problems of independent stroke adjustment while ensuring ease of assembly and mechanical design without increase in costs associated therewith.
  • a first interrupter unit that is, a circuit breaker
  • the switching device disclosed herein is, for example, a medium voltage switchgear having an operational rating of up to 38 kilo Volts and up to 40 kilo Amperes and comprises at least one pole assembly, per phase, in an operable connection with a drive unit via a drive connection rod.
  • the switching device that is, a circuit breaker is employed in renewable power generation stations, such as a wind power generation station and is a three phase switching device having one pole assembly per phase.
  • the pole assembly includes post insulators supporting two vacuum interrupters connected to one another representing a circuit breaker and a grounding switch respectively.
  • the drive connection rod is used to set a stroke of the circuit breaker.
  • the stroke refers to a gap between a fixed contact and a moving contact of a vacuum interrupter with the circuit breaker in an open condition.
  • the pole assembly includes an interlink arrangement therein operably connected to a moveable member of the first interrupter unit and a moveable member of the second interrupter unit of the pole assembly, and comprises at least one stroke adjusting member for setting a stroke of the second vacuum interrupter without affecting a stroke of the first vacuum interrupter.
  • the interlink arrangement of the pole assembly sets a stroke of the vacuum interrupter representing the grounding switch independent of the stroke of the circuit breaker.
  • the stroke adjusting member varies a distance of the moveable member of the second interrupter unit with respect to the moveable member of the first interrupter unit thereby, achieving independent stroke setting and/or adjustment.
  • the stroke adjusting member is disposed between connectors that are in operable connection with at least one of the moveable members of the interrupter units.
  • the stroke adjusting member adjusts the stroke during an open condition of the respective interrupter unit.
  • the stroke adjusting member adjusts a stroke of the grounding switch interrupter unit when the circuit breaker interrupter unit is in a closed condition and the grounding switch interrupter unit is in an open condition.
  • the stroke adjusting member comprises one or more spacer plates removably arranged between the connectors.
  • spacer platers refer to sheet metal elements having a thickness of about 1 mm.
  • the spacer plates are stacked on top of one another.
  • a quantity of the spacer plates is determined based on an adjustment required to be made to the stroke of the grounding switch, for example, post stroke setting via the drive connection rod.
  • the quantity of the spacer plates is determined based on ageing of the contacts which may have led to stroke adjustment requirements.
  • the spacer plates are removably stacked for ease of stroke adjustment.
  • each of the spacer plates is having a generally U-shape defining a space therewithin allowing for movement of the moveable member(s) therethrough.
  • the connectors are links configured to sandwich the spacer plates therebetween via one or more fasteners.
  • the links are configured as concave members biased against the spacer plates.
  • the connectors are in a physical connection with the moveable members of the interrupter units respectively.
  • the stroke adjusting member is configured to have multiple extrusions each having a predefined radius.
  • the stroke adjusting member is configured as a generally elliptical shaped disc having multiple holes therewithin which is rotatably disposed against the connectors for selectively aligning one of the extrusions, that is, holes with the connectors.
  • the stroke adjusting member is pivotable about its central axis.
  • the radii of the holes provide for a varied adjustment of the stroke such that larger is the radius of an extrusion from its centroidal axis, bigger is the stroke being set.
  • the connectors are configured as elongate members sandwiching therewithin the stroke adjusting member, and connected to both the moveable members of the interrupter units.
  • the connectors, the stroke adjusting member and the moveable member of the grounding switch are positioned in parallel to one another and connected with one or more fasteners allowing the stroke adjusting member to rotate about its central axis.
  • the connectors are configured with a slit which when aligned with a hole of a required radius allows the fastener such as a pin, to pass therethrough thereby allowing the moveable member connected thereto to move up and down axially resulting in stroke adjustment.
  • Also disclosed herein is a method for operating aforementioned switching device having a pole assembly as described above with two vacuum interrupters representing a circuit breaker and a grounding switch operably connected to one another.
  • the method includes displacing a drive connection rod by operating a drive unit connected thereto, of the switching device, configuring a stroke adjusting member of an interlink arrangement of the pole assembly for varying a physical distance of a moveable member of an interrupter unit with respect to a moveable member of another interrupter unit, when the interrupter unit is in an open state.
  • configuring the stroke adjusting member of the interlink arrangement comprises selectively removing and adding spacer plates between connectors of the interlink arrangement, based on a stroke to be maintained for the grounding switch.
  • configuring the stroke adjusting member of the interlink arrangement comprises selectively rotating the stroke adjusting member with respect to connectors of the interlink arrangement for aligning the connectors with one of the multiple extrusions configured on the stroke adjusting member.
  • the extrusion to be aligned is selected based on a stroke to be maintained for the grounding switch.
  • FIG 2 illustrates a pole assembly 200 for one of the phases of the switching device 106 shown in FIG 1B , according to an embodiment of the present disclosure.
  • the pole assembly 200 comprises a vacuum interrupter 202 operably connected to another vacuum interrupter 203 via an interlink arrangement 201.
  • the vacuum interrupter 202 represents the circuit breaker 101 shown in FIG 1A and the vacuum interrupter 203 represents the grounding switch 102 shown in FIG 1A .
  • the pole assembly 200 thus includes an integration of the circuit breaker and the grounding switch into a single switching device 106 shown in FIG 1B .
  • the interlink arrangement 201 is operably connected to a drive connection rod 204 which is in turn connected to a drive unit 205 of a switching device 106.
  • the interlink arrangement 201 allows for an adjustment of a stroke of the vacuum interrupter 203, that is, the grounding switch without affecting the stroke of the vacuum interrupter 202, that is, the circuit breaker.
  • FIGS 3A-3B illustrate different views of an interlink arrangement 201 of the pole assembly 200 shown in FIG 2 , according to one embodiment of the present disclosure.
  • FIG 3A shows an elevation view of the interlink arrangement 201.
  • FIG 3B shows a perspective view of the interlink arrangement 201.
  • the interlink arrangement 201 comprises a stroke adjusting member 201C operably connected to moveable stems 202A and 203A of the vacuum interrupters 202 and 203 respectively.
  • the stroke adjusting member 201C is sandwiched between connectors 201A and 201B.
  • the connector 201A is operably connected to the movable stem 202A of the vacuum interrupter 202.
  • the connector 201B is operably connected to the movable stem 203A of the vacuum interrupter 203.
  • the connectors 201A and 201B are connected to one another via fasteners 201D to sandwich the stroke adjusting member 201C therebetween.
  • FIG 4 illustrates a stroke adjusting member 201C of the interlink arrangement 201 shown in FIGS 3A-3B .
  • the stroke adjusting member 201C is configured of at least one spacer plate 201C' which is a metallic plate of a generally U-shape defining a space 201C" centrally therewithin.
  • the generally U-shaped configuration of the spacer plate 201C' allows axial movement of the moveable stems 202A and 203A.
  • the generally U-shaped configuration allows ease of removal and insertion of the spacer plate 201C' from and between the connectors 201A and 201B.
  • spacer plates 201C' are stacked on top of one another by loosening fasteners 201D thereby, achieving adjustment in the stroke of the vacuum interrupter 203 representing the grounding switch.
  • the stroke of the vacuum interrupter 202 representing the circuit breaker can be adjusted via the drive connection rod 204 connected to the drive unit 205 shown in FIG 2 thereby, achieving independent stroke adjustment of the vacuum interrupters 202 and 203.
  • FIGS 5A-5B illustrate different views of an interlink arrangement 201 of the pole assembly 200 shown in FIG 2 , according to another embodiment of the present disclosure.
  • FIG 5A shows an elevation view of the interlink arrangement 201.
  • FIG 5B shows a perspective view of the interlink arrangement 201.
  • the interlink arrangement 201 comprises two stroke adjusting members 201C each of which are sandwiched between a pair of connectors 201A and 201B which in turn are operably connected to moveable members 202A and 203A of the vacuum interrupters 202 and 203.
  • the interlink arrangement 201 comprises fasteners 201D allowing operable connection between the stroke adjusting members 201C, the connectors 201A and 201B and the moveable members 202A and 203A.
  • FIG 6 illustrates a stroke adjusting member 201C of the interlink arrangement 201 shown in FIGS 5A-5B .
  • the stroke adjusting member 201C is configured as a generally elliptical shaped plate adjustably connected to the moveable members 202A and 203A via the connectors 201A and 201B with help of one or more fasteners 201D shown in FIGS 5A and 5B .
  • the stroke adjusting member 201C is configured to have multiple extrusions 201E punched therethrough.
  • the stroke adjusting member 201C is configured to have a semi-circular slot 201 centrally punched in the spacer 201E, and a plurality of holes 201H surrounding the semi-circular slot 201F.
  • Each of the extrusions 201E are of varying radii.
  • the radii go on increasing from an extrusion 201Ea to 201Ed such that when the stroke adjusting member 201C is rotated with respect to the connectors 201A and 201B, along the semi-circular slot 201F and the fastener 201D is adjusted to fit through one of the extrusions 201Ea, 201Eb, 201Ec, or 201Ed, the stroke of the grounding switch, that is, the vacuum interrupter 203 goes on increasing in correspondence with the radius of the respective extrusion 201Ea, 201Eb, 201Ec, or 201Ed.
  • the stroke of the vacuum interrupter 202 representing the circuit breaker can be adjusted via the drive connection rod 204 connected to the drive unit 205 shown in FIG 2 thereby, achieving independent stroke adjustment of the vacuum interrupters 202 and 203.
  • FIG 7 illustrates a process flowchart 700 showing a method for operating aforementioned switching device 106 having a pole assembly 200 as described above with two vacuum interrupters 202 and 203 representing a circuit breaker and a grounding switch operably connected to one another via an interlink arrangement 201.
  • the method displaces a drive connection rod 204 by operating a drive unit 205 connected thereto, of the switching device 106.
  • stroke of the vacuum interrupter 202 is set to be at a specific distance in the open condition of the vacuum interrupter 202.
  • the method configures a stroke adjusting member 201C of the interlink arrangement 201 for varying a physical distance of a moveable member 203A of the interrupter unit 203 with respect to a moveable member 202A of the interrupter unit 202, when the interrupter unit 203 is in an open state and the interrupter unit 202 is in a closed state.
  • the method includes configuring the stroke adjusting member 201C by selectively removing and adding spacer plates 201C' between connectors 201A and 201B of the interlink arrangement 201, based on a stroke to be maintained for the grounding switch vacuum interrupter 203.
  • the method includes configuring the stroke adjusting member 201C by selectively rotating the stroke adjusting member 201C with respect to connectors 201A and 201B of the interlink arrangement 201 for aligning the connectors 201A and 201B, with one of multiple extrusions 201E configured on the stroke adjusting member 201C.
  • the method at step 702, includes selecting an extrusion 201E based on a stroke to be maintained for the grounding switch vacuum interrupter 203.

Landscapes

  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
EP20200515.3A 2020-03-24 2020-10-07 Agencement d'interconnexion pour un dispositif de commutation Active EP3886133B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IN202031012780 2020-03-24

Publications (2)

Publication Number Publication Date
EP3886133A1 true EP3886133A1 (fr) 2021-09-29
EP3886133B1 EP3886133B1 (fr) 2023-12-13

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ID=72801352

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Application Number Title Priority Date Filing Date
EP20200515.3A Active EP3886133B1 (fr) 2020-03-24 2020-10-07 Agencement d'interconnexion pour un dispositif de commutation

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0115739A1 (fr) * 1983-01-12 1984-08-15 Siemens Aktiengesellschaft Interrupteur à vide à deux tubes interrupteurs en série par pôle
DE29823220U1 (de) * 1998-12-23 1999-03-04 Siemens AG, 80333 München Hublängenänderungen für Vakuum-Schaltröhren
US5963021A (en) * 1998-05-11 1999-10-05 Siemens Power Transmission & Distribution, Llc Delayed contact closing apparatus and method for capacitors
US20090045171A1 (en) * 2007-08-18 2009-02-19 Ema Electromecanica S.A. Circuit breaker with high speed mechanically-interlocked grounding switch

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0115739A1 (fr) * 1983-01-12 1984-08-15 Siemens Aktiengesellschaft Interrupteur à vide à deux tubes interrupteurs en série par pôle
US5963021A (en) * 1998-05-11 1999-10-05 Siemens Power Transmission & Distribution, Llc Delayed contact closing apparatus and method for capacitors
DE29823220U1 (de) * 1998-12-23 1999-03-04 Siemens AG, 80333 München Hublängenänderungen für Vakuum-Schaltröhren
US20090045171A1 (en) * 2007-08-18 2009-02-19 Ema Electromecanica S.A. Circuit breaker with high speed mechanically-interlocked grounding switch

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Publication number Publication date
EP3886133B1 (fr) 2023-12-13

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