WO2014173732A1 - Mécanisme de commande de disjoncteur - Google Patents

Mécanisme de commande de disjoncteur Download PDF

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Publication number
WO2014173732A1
WO2014173732A1 PCT/EP2014/057630 EP2014057630W WO2014173732A1 WO 2014173732 A1 WO2014173732 A1 WO 2014173732A1 EP 2014057630 W EP2014057630 W EP 2014057630W WO 2014173732 A1 WO2014173732 A1 WO 2014173732A1
Authority
WO
WIPO (PCT)
Prior art keywords
auxiliary
main
spring assembly
drive mechanism
shaft
Prior art date
Application number
PCT/EP2014/057630
Other languages
English (en)
Inventor
Jagdish Shinde
Dinesh SONAWANE
Original Assignee
Siemens Aktiengesellschaft
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 Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2014173732A1 publication Critical patent/WO2014173732A1/fr

Links

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
    • 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
    • H01H3/3005—Charging means
    • H01H3/3026—Charging means in which the closing spring charges the opening spring or vice versa
    • 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
    • H01H2003/3094—Power arrangements internal to the switch for operating the driving mechanism using spring motor allowing an opening - closing - opening [OCO] sequence

Definitions

  • the present invention generally relates to a drive mechanism suitable for use in electrical switchgear. More specifically, the present invention relates to a drive mechanism suitable for use in a circuit breaker.
  • Switchgear is a combination of electrical switches, fuses and/or circuit breakers for controlling, isolating, and protecting electrical equipment.
  • a circuit breaker in particular, is designed to protect an electrical circuit from an overload or short-circuit.
  • the circuit breaker is an automatically operated electrical switch. The circuit breaker responds to a fault condition and immediately
  • a circuit breaker uses a drive mechanism to achieve operation of the circuit breaker in a desired manner.
  • Such drive mechanisms used in the circuit breakers should satisfy a number of functional requirements .
  • the drive mechanism should be such that after an initial energy transfer to the drive mechanism, the circuit breaker should be able to transition from an open to a closed position and then, back to an open position without any additional energy transfer thereto.
  • a circuit breaker typically uses a set of spring assemblies.
  • a closing spring assembly and an opening spring assembly are used to achieve transition of the circuit breaker through an open-closed-open switching sequence.
  • the drive mechanism is configured such that the closing spring assembly and the opening spring assembly may independently be in a charged or a discharged state, as required.
  • the drive mechanism charges the closing spring assembly while the opening spring assembly continues to be in the discharged state.
  • the closing spring assembly is triggered to be discharged. While discharging, the closing spring assembly causes an operating lever to be operated whereby the circuit breaker is
  • the opening spring assembly in the charged state, is capable of transitioning the circuit breaker from the closed state to the open state.
  • FIGS 1A through 1C illustrate a schematic representation of a circuit breaker
  • the circuit breaker 100 includes a contact assembly 102 and a drive mechanism 104.
  • the drive mechanism 104 includes a charging assembly 106, an operating assembly 108, a closing spring assembly 110, and an opening spring assembly 112.
  • the charging assembly 106 includes a driving motor (not shown), a set of gears (not shown), a closing wheel 114, a cam wheel 116, a charging shaft 118, a connecting rod 120, and a closing latch 122.
  • the driving motor drives the closing wheel 114 through the set of gears (not shown) .
  • the closing wheel 114 operates the cam wheel 116, which is splined to the charging shaft 118.
  • the charging shaft 118 is a crank shaft which is connected to the closing spring assembly 110 through the connecting rod 120.
  • the closing spring assembly 110 is charged.
  • the closing wheel 114 is disengaged from the cam wheel 116.
  • the cam wheel 116 is engaged to the closing latch 122.
  • the closing spring assembly 110 is now charged for carrying out a closing operation in the circuit breaker 100.
  • the energy stored in the closing spring assembly 110 is used to trigger the operating assembly 108 and also, charge the opening spring assembly 112 during the closing operation.
  • the operating assembly 108 includes a set of levers 124, 126 pivoted about an operating shaft 128, a connecting rod 130, a tie rod 132, and a trip latch 134.
  • the cam wheel 116 operates the lever 124 and accordingly, the operating shaft 128.
  • the operating shaft 128, causes the lever 126 to operate the connecting rod 130 and the tie-rod 132.
  • the lever 124 is engaged with the trip latch 134.
  • the opening spring assembly 112 is now charged for carrying out an opening operation in the circuit breaker 100.
  • the closing spring assembly 110 is independently charged almost immediately after being
  • the circuit breaker 100 and in particular, the drive mechanism 104 therefore, attains a state as depicted in FIG 1C.
  • the trip latch 134 is released, and then, the potential energy stored in the opening spring assembly 112 is used to open the circuit breaker 100.
  • both the closing spring assembly 110 and the opening spring assembly 112 are in the charged state.
  • the circuit breaker 100 is enabled to perform the open-close- open switching sequence without any external intervention.
  • the drive mechanism used in the state of the art employs a number of components thereby leading to increased complexity and high cost of maintenance.
  • such drive mechanisms are quite heavy and bulky, thereby requiring a lot of space and elaborate means for mounting within the circuit breaker.
  • the object of the present invention is achieved by a drive mechanism suitable for use in switchgear according to claim 1, and a circuit breaker comprising such drive mechanism according to claim 10. Further embodiments of the present invention are addressed in the dependent claims.
  • the present invention provides a drive mechanism suitable for use in a circuit breaker.
  • the circuit breaker is operable in one of an open state and a closed state.
  • the drive mechanism comprises a closing spring assembly, an opening spring assembly, a main shaft, an auxiliary shaft, and an auxiliary driving assembly.
  • Each of the closing and opening spring assemblies is operable in one of a charged state and a discharged state.
  • the main shaft has a first end and a second end; and is configured for rotation in a first direction.
  • the main shaft is coupled to the closing spring assembly such that rotation of the main shaft transitions the closing spring assembly between the charged and the discharged states thereof.
  • the auxiliary shaft has a first end and a second end.
  • the auxiliary shaft is arranged substantially along an axial direction of the main shaft. Further, the auxiliary shaft is coupled to the opening spring assembly such that rotation of the auxiliary shaft transitions the opening spring assembly between the charged and the discharged states thereof.
  • the auxiliary driving assembly is configured for driving the auxiliary shaft in the first direction based on rotation of the main shaft, and further configured for permitting
  • the present invention thus, provides a drive mechanism suitable for use in electrical switchgear, and in particular, a circuit breaker, which is simple and robust, compact, easy to maintain, and cost effective.
  • FIGS 1A-1C illustrate schematic view of a drive mechanism in accordance with the state of the art
  • FIG 2 illustrates a perspective view of a drive
  • FIG 3 illustrates an exploded view of selected parts of a drive mechanism in accordance with an embodiment of the present invention
  • FIG 4 illustrates a schematic view of a drive
  • FIG 5 illustrates a schematic view of a drive
  • a circuit breaker is operable in one of an open state and a closed state.
  • a drive mechanism is provided.
  • the present invention provides a drive mechanism suitable for use in a circuit breaker, as will now be described. Referring to FIGS 2 and 3, a perspective view of a drive mechanism 200 and an exploded view of selected parts thereof are respectively shown in accordance with an embodiment of the present invention.
  • the drive mechanism 200 includes a closing spring assembly
  • Each of the closing spring assembly 202 and an opening spring assembly 204 are operable in one of a charged state and a discharged state.
  • Each spring assembly 202, 204 includes a compression spring housed in a cylindrical casing with a first end plate and a second end plate. The first end plate is fixedly mounted on the cylindrical casing while the second end plate is configured for displacement within the
  • the drive mechanism 200 is configured such that when the closing spring assembly 202 transfers from the charged state to the discharged state, the circuit breaker transitions from the open state to the closed state. Further, when the opening spring assembly 204 transfers from the charged state to the discharged state, the circuit breaker transitions from the open state to the closed state.
  • the main shaft 206 has a first end 206a and a second end 206b.
  • the main shaft is coupled to the closing spring assembly 202 and is configured for rotation in a first direction (I) .
  • the rotation of the main shaft 206 transitions the closing spring assembly 202 between the charged and the discharged states thereof.
  • the auxiliary shaft 208 has a first end 208a and a second end 208b. The auxiliary shaft 208 is arranged
  • the main driving assembly 210 includes a main cam wheel 214, a main driving wheel 216, and main controlling means 218.
  • the main controlling means 218 include a main engaging lever 220, a spacer wheel 222, and a main disengaging flange 224.
  • the main cam wheel 214 is fixedly mounted on the main shaft 206 substantially near the first end 206a, as depicted in the adjoining figures.
  • the main shaft 206 and the main cam wheel 214 are provided with splines which facilitate fixed mounting of the main cam wheel 214 on the main shaft 206.
  • the term 'fixedly mounted' and variations thereof, are intended to express that a coupling between two components such that no relative motion is permitted there between.
  • the main driving wheel 216 is mounted on the main shaft 206 in a free-wheeling manner substantially adjacent to the main cam wheel 214.
  • a bearing is used, as will be readily apparent to one ordinarily skilled in the art.
  • the main driving wheel 216 is driven using an electrical motor coupled to the main driving wheel 216 through a set of gears. This is achieved using techniques well known in the art and hence, it is not being described herein for the sake of brevity.
  • the main controlling means 218 are configured for selectively engaging/disengaging the main driving wheel 216 to/from the main cam wheel 214 based on respective angular positions in a longitudinal plane (Y-Z) perpendicular to the axial direction (X) .
  • the main controlling means 218 include the main engaging lever 220 and the main disengaging flange 224.
  • the main engaging lever 220 is arranged in a fixed spaced relationship relative to the main driving wheel 216. This is achieved using the spacer wheel 222, as depicted in the adjoining figures.
  • the spacer wheel 222 is fixedly attached to the main driving wheel 216. In addition to being fixedly attached to the main driving wheel 216, the spacer wheel 222 may also be supported on the main shaft 206 using a bearing.
  • the main engaging lever 220 is biased towards an engaging position permitting the main engaging lever 220 to engage to the main cam wheel 214.
  • the desired biasing of the main engaging lever 220 towards the main cam wheel 214 may be achieved using a spring.
  • the main disengaging flange 224 is configured for displacing the main engaging lever 220 towards a disengaging position permitting the main engaging lever 220 to disengage from the main cam wheel 214.
  • the main shaft 206 is a crank shaft.
  • the main shaft 206 is coupled at the crank-end thereof to the closing spring assembly 202.
  • the auxiliary driving assembly 212 includes an auxiliary cam wheel 226, an auxiliary driving wheel 228, and auxiliary controlling means 230.
  • the auxiliary controlling means 230 include an auxiliary engaging lever 232, a spacer wheel 234, and an auxiliary disengaging flange 236.
  • the auxiliary driving assembly 212 is configured for driving the auxiliary shaft 208 in the first direction based on rotation of the main shaft 206.
  • the auxiliary driving assembly 212 is configured for permitting rotation of the auxiliary shaft 208 in a second direction (II) , the second direction (II) being opposite to the first direction (I), as depicted in the adjoining figures.
  • auxiliary shaft 208 in the second direction (II) is independent of the rotation of main shaft 206.
  • the main shaft 206 rotates only in the first direction (I) while the auxiliary shaft 208 rotates in a back-and- forth manner along the first direction (I) and the second direction (II) .
  • the auxiliary cam wheel 226 is fixedly mounted on the
  • auxiliary shaft 208 substantially near the first end 208a.
  • auxiliary driving wheel 228 is fixedly mounted on the main shaft 206 substantially near the second end 206b.
  • the auxiliary controlling means 230 are configured for selectively engaging/disengaging the auxiliary driving wheel 228 to/from the auxiliary cam wheel 226 based on respective angular positions in a longitudinal plane (Y-Z) perpendicular to the axial direction (X) .
  • the auxiliary controlling means 230 are similar in
  • the auxiliary controlling means 230 include the auxiliary engaging lever 232 and the auxiliary disengaging flange 236.
  • the auxiliary engaging lever 232 is arranged in a fixed spaced relationship relative to the auxiliary driving wheel 228. This is achieved using the spacer wheel 234.
  • the auxiliary engaging lever 232 is biased towards an engaging position permitting the auxiliary engaging lever 232 to engage to the auxiliary cam wheel 226.
  • the required biasing of the auxiliary engaging lever 232 may be achieved using a spring.
  • the auxiliary disengaging flange 236 is configured for displacing the auxiliary engaging lever 232 towards a disengaging position permitting the auxiliary engaging lever 232 to disengage from the auxiliary controlling means 230.
  • an operating lever 238 is fixedly mounted on the auxiliary shaft 208 substantially near the second end 208b.
  • the auxiliary shaft 208 is coupled to the opening spring assembly 204 through the operating lever 238. As shown in the adjoining figures, the closing spring
  • connection rod 244 is connected to the auxiliary shaft 208, and in particular the operating lever 238, using a connection rod 246.
  • the operating lever is further connected to a contact assembly (not shown) within the circuit breaker such that the charged and discharged states of the opening spring assembly 204 correspond to the closed and the open states respectively of the circuit breaker.
  • the operating lever 238 is coupled to a damping assembly 248 such that
  • the drive mechanism 200 further includes a closing latch 240 and a tripping latch 242.
  • Each latch 240, 242 are operable in an activated and a deactivated state .
  • the closing latch 240 maintains the closing spring assembly 202 in the charged state, while in the deactivated state, the closing latch 240 permits
  • the drive mechanism 200 is configured such that when the closing spring assembly 202 transfers from the charged state to the discharged state, the circuit breaker transitions from the open state to the closed state.
  • the tripping latch 242 in an activated state, maintains the opening spring assembly 204 in the charged state, while in the deactivated state, the tripping latch 242 permits transition of the opening spring assembly 204 from the charged state to the discharged state.
  • the drive mechanism 200 is configured such that when the opening spring assembly 204 transfers from the charged state to the discharged state, the circuit breaker
  • the contact assembly 252 is similar to the one described previously in conjunction with FIG 1A through IB. It should be noted that in FIG 2, only one contact assembly 252 is shown which corresponds to a single- phase circuit breaker. However, in various exemplary
  • the contact assembly 252 may correspond to a three-phase circuit breaker.
  • the connection rod 252 is configured to operate all movable contacts in individual phases to achieve open and/or close state thereof.
  • FIG 4 a schematic view of a drive mechanism 200 during a discharged-discharged state is depicted in
  • This reference angular position is indicated by Line reference angular position L0.
  • the main disengaging flange 224 is arranged at an offset of about 0 degrees relative to the reference angular position L0.
  • the auxiliary disengaging flange 236 is arranged at an offset relative to the reference angular position L0, wherein the offset ranges from about 200 degrees to 280 degree, more particularly, from about 220 degrees to about 260 degrees, and still more particularly is about 240 degrees. It should be noted that the main disengaging flange 224 and the
  • auxiliary disengaging flange 236 are fixedly mounted to a housing/enclosure of the drive mechanism 200 and/or the circuit breaker and remain stationary through the operation of the drive mechanism 200.
  • the relative positions of various constituent elements within the main driving assembly 210 and the auxiliary driving assembly 212 as shown in FIG 4 corresponds to a discharged- discharged state of the drive mechanism 200.
  • drive mechanism 200 is in such state only prior to first use, after a reset operation, or after a fault condition in the drive mechanism 200.
  • both the closing spring assembly 202 and the opening spring assembly 204 are in discharged state.
  • the engaging lever 220 and the auxiliary engaging lever 232 are arranged at about 60 degrees offset relative to the reference angular position L0.
  • the main cam wheel 214 and the auxiliary cam wheel 226 are arranged at about 240 degrees offset relative to the reference angular position L0.
  • the drive mechanism 200 is operated to change the state thereof from the discharged-discharged state to charged- discharged state.
  • the main driving wheel 216 While charging the closing spring assembly 202, the main driving wheel 216 is rotated about 180 degrees before the main engaging lever 220 engages the main cam wheel 214 and further rotates about 180 degrees along with the main cam wheel 214 whereby the closing spring assembly 202 transitions to the charged state.
  • the main disengaging flange 224 Towards the end of charging of the closing spring assembly 202, the main disengaging flange 224 displaces the main engaging lever 220 such that main driving wheel 216 is disengaged from the main cam wheel 214.
  • the auxiliary driving wheel 228, also rotates about 180 degrees to reach an offset of about 240 degrees relative to the reference angular position L0.
  • the auxiliary engaging lever 232 is engaged to the auxiliary cam wheel 226.
  • the closing latch 240 is activated to maintain the closing spring assembly 202 in the charged state .
  • FIG 5 a schematic view of a drive mechanism 200 during a charged-discharged state is depicted in accordance with an embodiment of the present invention.
  • the circuit breaker is still in the open state.
  • the closing latch 240 is deactivated, thus the closing spring assembly 202 discharges such that the potential energy stored in the closing spring assembly 202 is used to charge the opening spring assembly 204 and at the same time, transition the circuit breaker to the closed state.
  • the main shaft 206 rotates about 180 degrees in the first direction (I) .
  • the auxiliary driving wheel 228 drives the auxiliary cam wheel 226 through the auxiliary engaging lever 232.
  • the auxiliary cam wheel 226 and hence, the auxiliary shaft 208 rotate about 60 degrees along the first direction (I) .
  • the auxiliary driving wheel 228 drives the auxiliary cam wheel 226 through the auxiliary engaging lever 232.
  • the auxiliary cam wheel 226 and hence, the auxiliary shaft 208 rotate about 60 degrees along the first direction (I) .
  • the auxiliary driving wheel 228 drives the auxiliary cam wheel 226 through the auxiliary engaging lever 232.
  • the auxiliary cam wheel 226 and hence, the auxiliary shaft 208 rotate about 60 degrees along the first direction (I) .
  • the auxiliary driving wheel 228 drives the auxiliary cam wheel 226 through the auxiliary engaging lever 232.
  • the auxiliary cam wheel 226 and hence, the auxiliary shaft 208 rotate about 60 degrees along the first direction (I) .
  • auxiliary driving wheel 228 continues to rotate further and reach a position of about 60 degrees offset relative to the reference angular position L0.
  • the opening spring assembly 204 transitions to the charged state.
  • FIG 6 a schematic view of a drive mechanism 200 in a discharged-charged state is depicted in accordance with an embodiment of the present invention.
  • the drive mechanism 200 is configured such that the closing spring assembly 202 is charged immediately after the closing spring assembly 202 is discharged during closing the circuit breaker .
  • the drive mechanism 200 is operated further in a manner described in conjunction with FIG 4 to charge the closing spring assembly 202.
  • auxiliary driving wheel 228 rotates about 180 degrees in the first direction (I) to reach the position shown in the adjoining figure.
  • the drive mechanism 200 now achieves a charged-charged state, as depicted in FIG 7.
  • FIG 7 a schematic view of a drive mechanism in a charged-charged state is illustrated in accordance with an embodiment of the present invention.
  • the circuit breaker In the charged-charged state, the circuit breaker is closed.
  • the closing spring assembly 202 and the opening spring assembly 204 are in the charged state.
  • the closing latch 240 and the tripping latch 242 are activated to maintain the closing spring assembly 202 and the opening spring assembly 204 respectively in the charged states.
  • the tripping latch 242 When a signal to open the circuit breaker is received, the tripping latch 242 is deactivated.
  • the auxiliary shaft 208 and the auxiliary cam wheel 226 rotate in the second
  • the drive mechanism 200 At the end of opening of the circuit breaker, the drive mechanism 200 reaches a charged-discharged state as shown in FIG 5. Thus, during regular use of the circuit breaker, the drive mechanism 200 continues to transition between the charged- discharged state, the discharged-charged state, and the charged-charged state.
  • the present invention thus, provides a drive mechanism suitable for use in electrical switchgear, and in particular, a circuit breaker, which is simple and robust, compact, easy to maintain, and cost effective.

Landscapes

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

Abstract

L'invention concerne un mécanisme de commande approprié pour être utilisé dans un disjoncteur. Le mécanisme de commande comprend un ensemble ressort de fermeture, un ensemble ressort d'ouverture, un arbre principal, un arbre auxiliaire. L'arbre principal et l'arbre auxiliaire sont entraînés au moyen d'un ensemble d'entraînement principal et d'un ensemble d'entraînement auxiliaire respectivement. L'arbre auxiliaire est agencé sensiblement le long d'une direction axiale de l'arbre principal. L'arbre principal et l'arbre auxiliaire sont accouplés respectivement à l'ensemble ressort de fermeture et à l'ensemble ressort d'ouverture et les maintiennent dans un état chargé et/ou déchargé.
PCT/EP2014/057630 2013-04-25 2014-04-15 Mécanisme de commande de disjoncteur WO2014173732A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN458KO2013 2013-04-25
IN458/KOL/2013 2013-04-25

Related Child Applications (2)

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US14/781,601 A-371-Of-International US9856316B2 (en) 2013-04-12 2014-04-11 Antibodies targeting M-CSF
US15/795,364 Division US10081675B2 (en) 2013-04-12 2017-10-27 Antibodies targeting M-CSF

Publications (1)

Publication Number Publication Date
WO2014173732A1 true WO2014173732A1 (fr) 2014-10-30

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PCT/EP2014/057630 WO2014173732A1 (fr) 2013-04-25 2014-04-15 Mécanisme de commande de disjoncteur

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113113270A (zh) * 2021-04-14 2021-07-13 西安西电开关电气有限公司 一种合闸保持分闸脱扣系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4240300A (en) * 1977-08-08 1980-12-23 Mitsubishi Denki Kabushiki Kaisha Operation mechanism
EP0186171A2 (fr) * 1984-12-28 1986-07-02 Asea Ab Dispositif de commande pour disjoncteur
EP0372449A1 (fr) * 1988-12-09 1990-06-13 Gec Alsthom Sa Commande de disjoncteur
US7772513B2 (en) * 2006-09-29 2010-08-10 Kabushiki Kaisha Toshiba Switchgear and switchgear operating mechanism

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4240300A (en) * 1977-08-08 1980-12-23 Mitsubishi Denki Kabushiki Kaisha Operation mechanism
EP0186171A2 (fr) * 1984-12-28 1986-07-02 Asea Ab Dispositif de commande pour disjoncteur
EP0372449A1 (fr) * 1988-12-09 1990-06-13 Gec Alsthom Sa Commande de disjoncteur
US7772513B2 (en) * 2006-09-29 2010-08-10 Kabushiki Kaisha Toshiba Switchgear and switchgear operating mechanism

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113113270A (zh) * 2021-04-14 2021-07-13 西安西电开关电气有限公司 一种合闸保持分闸脱扣系统

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