EP2249360B1 - Antriebsmechanismus für Mittelspannungsschalter - Google Patents

Antriebsmechanismus für Mittelspannungsschalter Download PDF

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Publication number
EP2249360B1
EP2249360B1 EP09159297A EP09159297A EP2249360B1 EP 2249360 B1 EP2249360 B1 EP 2249360B1 EP 09159297 A EP09159297 A EP 09159297A EP 09159297 A EP09159297 A EP 09159297A EP 2249360 B1 EP2249360 B1 EP 2249360B1
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EP
European Patent Office
Prior art keywords
drive mechanism
operating shaft
shaft
plate element
longitudinal axis
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
EP09159297A
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English (en)
French (fr)
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EP2249360A1 (de
Inventor
Francesco Belloni
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.)
ABB Technology AG
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ABB Technology AG
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Publication date
Application filed by ABB Technology AG filed Critical ABB Technology AG
Priority to PL09159297T priority Critical patent/PL2249360T3/pl
Priority to ES09159297T priority patent/ES2389588T3/es
Priority to EP09159297A priority patent/EP2249360B1/de
Priority to CN2009201787555U priority patent/CN201594475U/zh
Priority to CN200910206347.0A priority patent/CN101882511B/zh
Priority to RU2010117357/07A priority patent/RU2531634C2/ru
Publication of EP2249360A1 publication Critical patent/EP2249360A1/de
Application granted granted Critical
Publication of EP2249360B1 publication Critical patent/EP2249360B1/de
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
    • H01H3/30—Power arrangements internal to the switch for operating the driving mechanism using spring motor
    • H01H3/3042—Power arrangements internal to the switch for operating the driving mechanism using spring motor using a torsion spring

Definitions

  • the present invention relates to a drive mechanism for a Medium Voltage switch, in particular a drive mechanism for a Medium Voltage line switch, having improved features.
  • the term Medium Voltage is referred to applications in the range of between 1 and 52 kV.
  • Document US 5 777 404 discloses a device according to the preamble of claim 1.
  • Medium Voltage switches in particular Medium Voltage line switches, are well known in the art and usually comprises a drive mechanism which is operatively connected to the kinematic chain of the switch and actuates it for opening and closing the contacts of the switch. Due to the speed needed for carrying out opening/closing operation, mechanical means are normally used to actuate the kinematic chain of the switch.
  • the drive mechanisms are based on springs which are loaded before carrying out the opening/closing operation; when the spring is released, the drive mechanism transmits the energy and the motion generated by the spring to the kinematic chain of the switch, thereby actuating the opening/closing operation with the required speed.
  • a problem that may occur during operation of a Medium Voltage switch derives from the increased frictional forces between the contact blades due to not-normal conditions in the plants.
  • the energy required to open the contacts i.e. to "detach" the contact blades from each other
  • the energy required to open the contacts is greater than the energy required under normal conditions.
  • over-dimensioning of the spring is often necessary in order to have proper operation under all conditions, with a consequent increase in manufacturing costs.
  • a further problem derives from the speed requirements of the opening/closing operation of the switch which involves an accurate dimensioning of the spring, as well as an accurate testing thereof.
  • the characteristics of the spring may change during the operation life, thereby reducing also the speed characteristics of the associated switch under values that may no longer be acceptable.
  • the present invention is aimed at providing a drive mechanism for a Medium Voltage switch which does not require over-dimensioning of the spring.
  • a further object of the present invention is to provide a drive mechanism for a Medium Voltage switch which does not require an excessively accurate dimensioning and pre-testing of the spring.
  • Another object of the present invention is to provide a drive mechanism for a Medium Voltage switch which allows to tune the characteristics of the spring and adapt it to the application in an easy way.
  • Still another object of the present invention is to provide a drive mechanism for a Medium Voltage switch with reduced manufacturing, installation and maintenance costs.
  • the present invention relates to a drive mechanism for a Medium Voltage switch which is characterized in that it comprises:
  • the operating shaft is provided with release means acting on said power shaft by manual rotation of said operating shaft, and the spring assembly is provided with adjusting means for regulating the pre-load of said spiral spring.
  • the drive mechanism for a Medium Voltage switch allows to operate also in case of increased frictional forces between the contact blades, as better explained hereinafter. Thue, over-dimensioning of the spring with respect to the speed requirements of the switch is no longer necessary.
  • the presence of the adjusting means allows to fine tune the characteristics of the spring when already installed in the drive mechanism, without requiring an excessively accurate dimensioning and pre-testing of it.
  • a Medium Voltage switch comprising a drive mechanism as described above is also part of the present invention.
  • a drive mechanism for a Medium Voltage switch generally comprises a base plate 10 and a front plate 11 that define an internal space. Additional plates, e.g. plates 12 and 13, can also be present between the front 11 and base 10 plate.
  • the drive mechanism also comprises a number of components for its connection to a Medium Voltage switch that can be of conventional type and that will not described in details.
  • An operating shaft 2 and a power shaft 3 are housed in said internal space and are coaxially mounted along a first longitudinal axis, the power shaft 3 being operatively connectable to a kinematic chain of a Medium Voltage switch through conventional linking system to actuate the opening/closing operation of said switch.
  • the operating shaft 2 has a head 20 connectable to an operating handle for manual actuation of said operating shaft, through a hole positioned on the front plate 11 of the drive mechanism 1.
  • the drive mechanism 1 of the invention further comprises a spring assembly 4 which comprises a spiral spring 41, also positioned in the internal space between the base plate 10 and the front plate 11.
  • the spiral spring 41 has a first end 411 which is operatively coupled to said operating shaft 2 and a second end 412 operatively couplable to said power shaft 3. In this way, the spiral spring 41 can be loaded by rotation of said operating shaft 2 and than actuates said power shaft 3 when released.
  • the closing operation is carried out by rotating clockwise the operating shaft 2, through an operating handle acting on the head 20 of the operating shaft 2; during said rotation, the spiral spring 41 is loaded until when a release point is reached, at which point the spring is release transmitting motion and energy to the power shaft 3 which, being connected to the kinematic chain of the switch, actuates the closing operation of said switch.
  • the opening operation is carried out by rotating counterclockwise the operating shaft 2; during said rotation, the spiral spring 41 is loaded until when a release point is reached, at which point the spring is release transmitting motion to the power shaft 3 in the opposite direction with respect to the closing operation, thereby actuating the opening operation of the switch.
  • the operating shaft 2 is provided with release means 21 acting on said power shaft 3 by manual rotation of said operating shaft 2.
  • this allow to act on the power shaft 3, and consequently also on the contact assembly of the switch, applying additional forces to the force exerted by the spring 41, thereby allowing to detach from each other the contact blades of the switch even in case of increase frictional forces between the contact blades.
  • the spring assembly 4 is conveniently provided with adjusting means 40 for regulating the pre-load of said spiral spring 41.
  • the speed characteristics of the spring 41 can be changed, or at least fine-tuned, according to needs, thereby allowing accurate calibration of the speed characteristics of the drive mechanism and/or compensating variations due to, e.g., aging of the spring itself or other mechanical components of the drive mechanism and/or of the switch.
  • the operating shaft 2 comprises a disk 22 of substantially circular shape which is mounted perpendicularly to the longitudinal axis of the operating shaft 2 (i.e., perpendicular to the first longitudinal axis).
  • a first plate element 23 protrudes perpendicularly from the disk 22 in the direction of the head 20 of said operating shaft 2 and is operatively couplable to the second end 412 of said spiral spring.
  • the power shaft 3 comprises a first L shaped lever 30 having a flat base 31 with a first end 311 which rotationally mounted along said first longitudinal axis; a second plate element 32 protruding from a second end 312 of said flat base 31, perpendicular to the flat base 31 and parallel to said first longitudinal axis, in the direction of the head 20 of said operating shaft 2, said second plate element 32 being operatively couplable with the second end 412 of the spiral spring 41.
  • the first 23 and second 32 plate elements protrudes respectively from the disk 22 and the flat base 31 along parallel directions.
  • said second plate element 32 is positioned at a distance from said first longitudinal axis which is greater than the distance of said first plate element 23 from said first longitudinal axis; in other words, the length of the flat base 31 is greater than the diameter of the disk 22.
  • the length of the second plate element 32 is greater than the length of said first plate element 23.
  • the spring assembly 4 preferably comprises a second lever 42 which has a base 43 coaxially mounted on said operating shaft 2 in correspondence of the disk 22.
  • the base 43 is provided with fixing means for the first end 411 of the spiral spring 41; for instance, the fixing means can be a groove 430 in which the first end 411 of said spiral spring 41 is secured.
  • the second lever 42 has a distal end portion 44 onto which said adjusting means 40 are positioned.
  • the adjusting means 40 are positioned so as to cooperate with said first plate element 23 of said operating shaft 2.
  • the adjusting means 40 allow to rotate the second lever 40 (onto which the first end 411 of the spiral spring is fixed, with respect to the disk 22 of the operating shaft 2, thereby changing the pre-load of the spiral spring 41 and consequently also its speed characteristics.
  • said adjusting means 40 can comprise a hole 47, preferably a threaded hole, positioned on the distal end portion 44 of said second lever 42 and screw means 45 inserted in said hole 47 and abutting against the first plate element 23 of said operating shaft 2.
  • screw 45 By rotating the screw 45, the second lever 42 can be rotated to a more or less great extent with respect to the operating shaft 2, consequently changing the pre-load applied to the spiral spring 41.
  • said release means 21 comprises a protrusion 210 which is keyed on the disk 22 of said operating shaft 2.
  • Said protrusion 210 has an edge 211 which is capable to interact with the second plate element 32 of said power shaft 3.
  • the protrusion 210 can be a part of a circular ring, keyed on the disk 22, having an edge 211 radially protruding from said disk 22.
  • the length of the edge 211 is such that it can intercept the second plate element 32 of the power shaft 3, by rotating the operating shaft 2 with respect to the power shaft 3.
  • the edge 211 of the protrusion 210 can be brought into contact with the second plate element 32 of said power shaft 3 by manual rotation of said operating shaft 2.
  • Figure 5 shows the positions of the operating shaft 2 and power shaft 3 in correspondence of a situation in which the contacts of an associated switch are closed. In such a situation, the spiral spring 41 is not loaded (excluding the pre-load applied by the adjusting means 40).
  • the opening operation starts with the loading of the spring 41, which is carried out by acting on the head 20 of the operating shaft 2 and rotating it counterclockwise, till the position of figure 6 is reached.
  • the spiral spring 41 is loaded and is in the position of figure 6 , it is released and snaps; energy is thus transmitted to the power shaft 3 through the second end 412 of the spring 41 which acts on the second plate element 32 of the power shaft 3.
  • the contacts of the switch are free (i.e. the frictional forces are within the design limits)
  • the power shaft 3 is rotated thereby opening the contacts of the switch.
  • the energy of the spiral spring can not be sufficient to detach them from each other and allow the opening operation.
  • the release means 21 of the drive mechanism of the invention acts on the power shaft 3 and applies additional forces thereon, thus allowing detaching of the contact.
  • the edge 211 of the protrusion 210 is into contact with the second plate element 32 and the force applied to the operating shaft 2 can thus be transferred to the power shaft 3 and consequently to the contacts of the switch.
  • a second operating shaft 5 is also present.
  • the second operating shaft 5 is preferably mounted on a second longitudinal axis parallel to said first longitudinal axis and can be advantageously used to carry out the earthing operation of the switch acting on a shaft which is independent from the first (main) operating shaft 2 which is used for the opening and closing operation.
  • the drive mechanism 1 for a Medium Voltage switch, in particular for a Medium Voltage line switch, of the present invention has a number of advantages with respect to the Medium Voltage switches equipped with conventional drive mechanisms.
  • the presence of the release means 21 allow to minimize the energy requirements of the spiral spring 41, with a consequent saving of costs. Even more important, the presence of said release means 21 allows to detach the contact blades in case of excessive frictional forces between them, with a consequent substantial increase of the safety for the switch associated to the drive mechanism as well as of the plant in which it is used.
  • the presence of the adjusting means 40 does not require an excessively accurate dimensioning and pre-testing of the spiral spring 41, since the speed characteristics of the spring can be calibrated and fine-tuned after assembling. Moreover, the adjusting means 40 allow adjusting the speed characteristics of the spiral spring 41, in case of variation over the time of the characteristics of the spring itself and/or of the associated mechanical components.
  • the structure of the drive mechanism of the invention is very compact and can be adapted, with only a few modification, to a number of different Medium Voltage applications.

Landscapes

  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Breakers (AREA)

Claims (11)

  1. Antriebsmechanismus (1) für einen Mittelspannungsschalter, dadurch gekennzeichnet, dass er aufweist:
    - eine Basisplatte (10) und eine Frontplatte (11), die einen Innenraum definieren, in dem eine Arbeitswelle (2) und eine Leistungswelle (3) aufgenommen sind, die koaxial auf einer ersten Längsachse befestigt sind, wobei die Leistungswelle (3) mit einer kinematischen Kette eines Mittelspannungsschalters für einen Öffnungs-/Schließvorgang des Schalters operativ verbindbar ist, wobei die Arbeitswelle (2) einen Kopf (20) aufweist, der mit einem Bediengriff für eine manuelle Betätigung der Welle verbindbar ist;
    - eine Federbaugruppe (4), die eine Spiralfeder (41) mit einem ersten Ende (411) aufweist, das mit der Arbeitswelle (2) operativ gekoppelt ist, dadurch gekennzeichnet, dass ein zweites Ende (412) mit der Leistungswelle (3) operativ koppelbar ist, wobei die Spiralfeder (41) durch eine Drehung der Arbeitswelle (2) vorgespannt wird und bei Freigabe die Leistungswelle (3) betätigt;
    - wobei die Arbeitswelle (2) mit einer Freigabeeinrichtung (21) versehen ist, die auf die Leistungswelle (3) durch eine manuelle Drehung der Arbeitswelle (2) einwirkt;
    - wobei die Federbaugruppe (4) mit einer Justierungseinrichtung (40) zum Regulieren der Vorspannung der Spiralfeder (41) versehen ist.
  2. Antriebsmechanismus (1) nach Anspruch 1, dadurch gekennzeichnet, dass die Arbeitswelle (2) eine Scheibe (22) mit einer im Wesentlichen kreisförmigen Form, die im rechten Winkel zu der ersten Längsachse befestigt ist, und ein erstes Plattenelement (23) aufweist, das im rechten Winkel von der Scheibe (22) in Richtung des Kopfes (20) der Arbeitswelle (2) vorsteht, wobei das erste Plattenelement (23) mit dem zweiten Ende (412) der Spiralfeder operativ koppelbar ist.
  3. Antriebsmechanismus (1) nach Anspruch 2, dadurch gekennzeichnet, dass die Leistungswelle (3) einen ersten L-förmigen Hebel (30) mit einer ebenen Basis (31) mit einem ersten Ende (311), das entlang der Längsachse drehbar montiert ist, und ein zweites Plattenelement (32) aufweist, das von einem zweiten Ende (312) der ebenen Basis (31) im rechten Winkel zu der ebenen Basis (31) und parallel zu der Längsachse in Richtung des Kopfes (20) der Arbeitswelle (2) vorsteht, wobei das zweite Plattenelement (32) sich in einem Abstand von der ersten Längsachse befindet, der größer als der Abstand des ersten Plattenelements (23) von der ersten Längsachse ist, und mit dem zweiten Ende (412) der Spiralfeder (41) operativ koppelbar ist.
  4. Antriebsmechanismus (1) nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Federbaugruppe (4) einen zweiten Hebel (42) mit einer Basis (43), die koaxial auf der Arbeitswelle (2) befestigt ist, und einem distalen Endbereich (44) aufweist, wobei die Basis (43) eine Aussparung (430) aufweist, in der das erste Ende (411) der Spiralfeder (41) gesichert ist, wobei die Justierungseinrichtung (40) auf dem distalen Endbereich (44) des zweiten Hebels (42) positioniert ist.
  5. Antriebsmechanismus (1) nach Anspruch 2 und 4, dadurch gekennzeichnet, dass die Justierungseinrichtung (40) mit dem ersten Plattenelement (23) der Arbeitswelle (2) zusammenarbeitet.
  6. Antriebsmechanismus (1) nach Anspruch 5, dadurch gekennzeichnet, dass die Justierungseinrichtung (40) ein Loch (47), das auf dem distalen Endbereich (44) des zweiten Hebels (42) positioniert ist, und ein Schraubmittel (45) aufweist, das in das Loch (47) eingefügt wird und an dem ersten Plattenelement (23) der Arbeitswelle (2) angrenzt.
  7. Antriebsmechanismus (1) nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Freigabeeinrichtung (21) einen Vorsprung (210) aufweist, der mit der Scheibe (22) der Arbeitswelle (2) verkeilt ist.
  8. Antriebsmechanismus (1) nach Anspruch 3 und 7, dadurch gekennzeichnet, dass der Vorsprung (210) einen Rand (211) aufweist, der mit dem zweiten Plattenelement (32) der Leistungswelle (3) interagieren kann.
  9. Antriebsmechanismus (1) nach Anspruch 5, dadurch gekennzeichnet, dass der Rand (211) des Vorsprungs (210) mit dem zweiten Plattenelement (32) der Leistungswelle (3) durch manuelle Betätigung der Arbeitswelle (2) in Kontakt versetzt wird.
  10. Antriebsmechanismus (1) nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass er eine zweite Arbeitswelle (5) aufweist, die auf einer zweiten Längsachse parallel zu der ersten Längsachse befestigt ist.
  11. Mittelspannungsschalter, dadurch gekennzeichnet, dass er einen Antriebsmechanismus (1) nach einem oder mehreren der vorherigen Ansprüche aufweist.
EP09159297A 2009-05-04 2009-05-04 Antriebsmechanismus für Mittelspannungsschalter Active EP2249360B1 (de)

Priority Applications (6)

Application Number Priority Date Filing Date Title
PL09159297T PL2249360T3 (pl) 2009-05-04 2009-05-04 Mechanizm napędowy do przełącznika średniego napięcia
ES09159297T ES2389588T3 (es) 2009-05-04 2009-05-04 Mecanismo de transmisión para interruptor de media tensión
EP09159297A EP2249360B1 (de) 2009-05-04 2009-05-04 Antriebsmechanismus für Mittelspannungsschalter
CN2009201787555U CN201594475U (zh) 2009-05-04 2009-10-15 用于中压开关的驱动机构及包括该驱动机构的中压开关
CN200910206347.0A CN101882511B (zh) 2009-05-04 2009-10-15 用于中压开关的驱动机构及包括该驱动机构的中压开关
RU2010117357/07A RU2531634C2 (ru) 2009-05-04 2010-04-30 Приводной механизм для выключателя среднего напряжения

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09159297A EP2249360B1 (de) 2009-05-04 2009-05-04 Antriebsmechanismus für Mittelspannungsschalter

Publications (2)

Publication Number Publication Date
EP2249360A1 EP2249360A1 (de) 2010-11-10
EP2249360B1 true EP2249360B1 (de) 2012-07-04

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EP09159297A Active EP2249360B1 (de) 2009-05-04 2009-05-04 Antriebsmechanismus für Mittelspannungsschalter

Country Status (5)

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EP (1) EP2249360B1 (de)
CN (2) CN201594475U (de)
ES (1) ES2389588T3 (de)
PL (1) PL2249360T3 (de)
RU (1) RU2531634C2 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2249360B1 (de) * 2009-05-04 2012-07-04 ABB Technology AG Antriebsmechanismus für Mittelspannungsschalter
EP2645395B1 (de) 2012-03-26 2014-11-12 ABB Technology AG Elektrische Schaltvorrichtung und dazugehöriges elektrisches Gerät
CN110400722B (zh) * 2019-07-02 2021-04-13 浙江华地电子有限公司 一种风压开关
EP3965130A1 (de) * 2020-09-07 2022-03-09 ABB Schweiz AG Schaltsystem

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB696142A (en) * 1950-11-09 1953-08-26 Gen Electric Co Ltd Improvements in or relating to torsion spring arrangements in electric circuit breakers
US3376422A (en) * 1964-07-15 1968-04-02 Minnesota Mining & Mfg Radioactive source comprising a sheet article containing a layer of small discrete radioactive beads
AU706365B2 (en) * 1994-11-07 1999-06-17 Siemens Aktiengesellschaft Rotating actuator
JP2002231111A (ja) * 2001-01-31 2002-08-16 Mitsubishi Electric Corp 開閉器操作装置の駆動力蓄勢装置
EP2249360B1 (de) * 2009-05-04 2012-07-04 ABB Technology AG Antriebsmechanismus für Mittelspannungsschalter

Also Published As

Publication number Publication date
CN101882511B (zh) 2014-06-18
EP2249360A1 (de) 2010-11-10
CN101882511A (zh) 2010-11-10
ES2389588T3 (es) 2012-10-29
RU2531634C2 (ru) 2014-10-27
CN201594475U (zh) 2010-09-29
RU2010117357A (ru) 2011-11-10
PL2249360T3 (pl) 2012-12-31

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