EP2426686A1 - Betriebseinrichtung - Google Patents

Betriebseinrichtung Download PDF

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Publication number
EP2426686A1
EP2426686A1 EP09843975A EP09843975A EP2426686A1 EP 2426686 A1 EP2426686 A1 EP 2426686A1 EP 09843975 A EP09843975 A EP 09843975A EP 09843975 A EP09843975 A EP 09843975A EP 2426686 A1 EP2426686 A1 EP 2426686A1
Authority
EP
European Patent Office
Prior art keywords
motor
circuit
series
contacts
switch
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
EP09843975A
Other languages
English (en)
French (fr)
Other versions
EP2426686B9 (de
EP2426686B1 (de
EP2426686A4 (de
Inventor
Tsuyoshi Mori
Daisuke Fujita
Masato Kawahigashi
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP2426686A1 publication Critical patent/EP2426686A1/de
Publication of EP2426686A4 publication Critical patent/EP2426686A4/de
Application granted granted Critical
Publication of EP2426686B1 publication Critical patent/EP2426686B1/de
Publication of EP2426686B9 publication Critical patent/EP2426686B9/de
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
    • H01H33/02—Details
    • H01H33/42—Driving mechanisms
    • 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
    • H01H33/02—Details
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/36—Power arrangements internal to the switch for operating the driving mechanism using dynamo-electric 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
    • H01H3/26—Power arrangements internal to the switch for operating the driving mechanism using dynamo-electric motor
    • H01H2003/266—Power arrangements internal to the switch for operating the driving mechanism using dynamo-electric motor having control circuits for motor operating switches, e.g. controlling the opening or closing speed of the contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2300/00—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H
    • H01H2300/002—Application electric motor braking, e.g. pole reversal of rotor, shorting motor coils, also for field discharge
    • 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
    • H01H33/02—Details
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/40—Power arrangements internal to the switch for operating the driving mechanism using spring motor

Definitions

  • the present invention relates to an operating device of a switch.
  • a window that enables visual confirmation of a switch main body is provided, to prepare for a case when mismatch occurs between an open/close state of the switch main body and a display state of a switch display that is provided in an operating device.
  • Patent Literature 1 in an electric-spring operating device, there is provided a torque limiter that generates slide when a load torque becomes equal to or larger than a predetermined value between a motor that accumulates energy of a spring and gears, thereby preventing breakage of a power transmission mechanism itself by an excessive load torque.
  • Patent Literature 1 Japanese Utility Model Laid-open Publication No. S55-138716
  • a load equal to or larger than that assumed in designing occurs, for example, when a frictional resistance of a sliding unit in the mechanism increases or when a parts fastening bolt becomes loose, there is a possibility that a part in the power transmission mechanism is broken, that a switch at a main circuit side does not operate although an open/close operation is completed at an operating device side, and that an open/close state of the operating device and an open/close state of a switch main body do not match each other.
  • a portion to be monitored is grounded by turning on a separate switch after a circuit is separated from a system in an operation of maintenance and monitoring. In this case, if the state of the switch cannot be correctly confirmed, it is possible that a high voltage portion is erroneously turned on.
  • the device has an object of preventing generation of an excessive load by controlling not to transmit an excessive torque equal to or larger than an assumed value.
  • the torque limiter operates immediately before completing an open/close operation
  • the mechanism continues operating based on inertia of a rotation shaft at a power transmission mechanism side immediately after a torque limiter operation. As a result, there is a possibility that other parts are broken due to a collision between parts in the mechanism.
  • the present invention has been achieved in view of the above problems, and an object of the present invention is to provide an operating device that can prevent generation of an unexpected load between a switch main body and the operating device, prevent breakage of a power transmission mechanism, and match an open/close state of the operating device with an open/close state of the switch main body.
  • an operating device including a motor, a motor control circuit that controls the motor, an operating circuit that controls the motor control circuit, and a torque limiter that does not output a torque equal to or larger than a predetermined value by the motor, and that performs an open/close operation by transmitting a torque by the motor to a switch via a power transmission mechanism, wherein during a turn-on operation or a turn-off operation of the switch, the operating circuit controls the motor control circuit in a circuit configuration including a first series circuit in which a motor armature of the motor and a motor field element are connected in series and in which a motor current flows, and during a certain time after completing a turn-on operation or a turn-off operation, the operating circuit controls the motor control circuit in a circuit configuration including a closed loop circuit in which the motor armature and a first resistor are connected in series and a second series circuit in which the motor armature and a second resistor are connected
  • a torque generated by the inertia motion of the motor after disconnecting a motor current can be reduced, and a load that is applied to a motor transmission mechanism is reduced. Therefore, generation of a torque equal to or larger than that assumed in designing can be prevented even after completing a turn-on operation or an open operation.
  • the present invention it is possible to prevent generation of an unexpected load between a switch main body and an operating device, to prevent breakage of a power transmission mechanism, and to match an open/close state of the operating device with an open/close state of the switch main body.
  • FIG. 1 is a configuration diagram of a switching device that includes an operating device 2 according to a first embodiment of the present invention.
  • the switching device shown in FIG. 1 includes a switch 1, the operating device 2 that operates the switch 1, and a power transmission mechanism 3 provided between the switch 1 and the operating device 2 and that transmits a torque generated by the operating device 2 to the switch 1 as an operation force.
  • the switch 1 is a disconnecting switch or a ground switch of a gas-insulating switch device, for example.
  • the switch 1 includes a switching unit 5 that includes a conductor that performs an open/close operation in a tank 4 that is sealed with a gas.
  • a monitoring window 6 provided in the tank 4 is for visually confirming an open/close state.
  • a motor 7 as a generation source of an operation force is provided in the operating device 2.
  • the motor 7 is controlled by a motor control circuit 8, and the motor control circuit 8 is controlled by an operating circuit 9.
  • a power transmission shaft as a rotation shaft of the motor 7 is connected to a speed reduction mechanism 11. Rotation of the motor 7 is decelerated via the speed reduction mechanism 11, and thereafter is transmitted as rotation of an output shaft 13 of the speed reduction mechanism 11.
  • the output shaft 13 is connected to the power transmission mechanism 3, and operates the switching unit 5 as a main body of the switch 1 via a shaft that is hermetically accommodated in the tank 4.
  • the power transmission mechanism 3 is configured to include a shaft, for example.
  • a torque limiter 10 is provided that stops transmission of a torque when a torque equal to or larger than a predetermined value is generated between the motor 7 and the speed reduction mechanism 11.
  • an open/close state display mechanism 12 is provided that can display an open/close state by moving a display plate with a bar that is coordinated with the output shaft 13, for example.
  • FIG. 2 is a circuit diagram of the operating circuit 9.
  • a limit switch H opens when the switching unit 5 is at a turn-on position and closes when the switching unit 5 is at an open position, and this is mechanically controlled by a position of gears or the like.
  • a limit switch L closes when the switching unit 5 is at a turn-on position and opens when the switching unit 5 is at an open position.
  • the limit switch H is a closed switch and the limit switch L is an opened switch, and therefore FIG. 2 is a circuit diagram when the switching unit 5 is in a disconnected state (an open-path state).
  • a relay CX22 represents a coil portion of a relay used for a turn-on operation (a close operation).
  • the relay CX22 includes contacts CX23 and CX25.
  • the limit switch H is connected between the relay CX22 and the contact CX23.
  • An input signal voltage as a turn-on operation signal (a closed-path command signal) can be applied between the limit switch H and the contact CX23.
  • a turn-on operation signal is input in a closed state of the limit switch H like in an example shown in FIG. 2
  • a coil incorporated in the relay CX22 is excited, and the contact CX23 is closed by a force generated by this coil.
  • the contacts CX23 and CX25 can be open/close controlled by exciting the coil of the relay CX22 or by cancelling excitation of the coil.
  • An operating voltage is always applied to both ends of the contact CX23, the limit switch H, and the relay CX22 that are connected in series.
  • a relay TX20 indicates a coil portion of a relay used for a turn-off operation (an open operation).
  • the relay TX20 includes contacts TX21 and TX24.
  • the limit switch L is connected between the relay TX20 and the contact TX21.
  • An input signal voltage as a turn-off operation signal (an open-path command signal) can be applied between the limit switch L and the contact TX21.
  • the contacts TX21 and TX24 can be open/close controlled by exciting a coil of the relay TX20 or by cancelling excitation of the coil. An operating voltage is always applied to both ends of the contact TX21, the limit switch L, and the relay TX20 that are connected in series.
  • a timer relay T has a contact Ta and a contact Tb.
  • the contact Ta is opened when a coil incorporated in the relay T is excited, and closes when excitation is cancelled.
  • the timer relay T is in an excited state and the contact Ta is opened, at an operating voltage that is always applied.
  • the contact Tb is a timer contact and is always in a closed state, but is opened after a lapse of a predetermined time when the contact Ta is closed.
  • the operating circuit 9 further includes relays AX and BX.
  • the relay AX or BX is connected in series to the contact Tb and the contact Ta, and an operating voltage is applied to their both ends.
  • FIG. 3 is a circuit diagram of the motor control circuit 8.
  • the resistor circuit 50 is constituted by a braking resistor R1 (a first resistor), a contact BX32, and a contact BX33, and the resistor circuit 51 is constituted by a braking resistor R2 (a second resistor), a contact AX30, and a contact AX31.
  • a bridge circuit is configured by having arranged contacts CX26, CX27, TX28, and TX29 at four sides, respectively. This bridge circuit is connected in series to a motor field element MF, and an operating voltage is applied to their both ends.
  • the contacts CX26 and CX27 are those of the relay CX22, respectively.
  • the contacts TX28 and TX29 are those of the relay TX20, respectively.
  • FIG. 3 when only the contacts CX26 and CX27 are closed, a motor current flows to the motor armature M and the motor field element MF at an operating voltage.
  • a current flows in a direction opposite to that when only the contacts CX26 and CX27 are closed.
  • An open operation or a close operation of the switching unit 5 is performed by inverting a rotation direction of the motor by forward/reverse controlling a direction of a current that flows to the motor armature M.
  • the resistor circuit 51 is connected in parallel to the bridge circuit, and the resistor circuit 50 is connected in parallel to the motor armature M in the bridge circuit.
  • the contact AX30, the resistor R2, and the contact AX31 are connected in series in this order.
  • the contact BX32, the resistor R1, and the contact BX33 are connected in series in this order.
  • the contacts AX30 and AX31 are those of the relay AX in FIG. 2 , respectively, and both contacts close when a coil incorporated in the relay AX is excited.
  • the contacts BX32 and BX33 are those of the relay BX in FIG. 2 , respectively, and both contacts close when a coil incorporated in the relay BX is excited.
  • the motor control circuit 8 is actually configured to include the motor armature M and the motor field element MF as shown in FIG. 3 .
  • FIG. 4 is a circuit configuration diagram of an initial state (a switched-off state) of an operating circuit ( FIG. 4(a) ) and a motor control circuit ( FIG. 4(b) ).
  • FIG. 5 is a circuit configuration diagram when a closed-path signal is on (a CX coil voltage is applied) of an operating circuit ( FIG. 5(a) ) and a motor control circuit ( FIG. 5(b) ).
  • FIG. 6 is a circuit configuration diagram when a closed-path signal is completed (a CX coil voltage is cancelled) of an operating circuit ( FIG. 6(a) ) and a motor control circuit ( FIG. 6(b) ).
  • FIG. 7 is a circuit configuration diagram when a closed-path signal is completed (AX/BX coil voltages are cancelled) of an operating circuit ( FIG. 7(a) ) and a motor control circuit ( FIG. 7(b) ).
  • the switch 1 is in an open state, and in this case, the operating circuit 9 and the motor control circuit 8 are in an initial state (a switched-off state) of FIGS. 4(a) and 4(b) , respectively.
  • FIG. 4(a) when an input signal voltage as a turn-on operation signal is applied ( FIG. 4(a) ), a coil incorporated in the relay CX22 is excited, and the contact CX23 is closed by a force generated by this coil ( FIG. 5(a) ).
  • a motor current flows by closing the contacts CX26 and CX27 that are connected in series to the motor armature M ( FIG. 5(b) ).
  • the motor armature M and the motor field element MF are connected in series via the contacts CX26 and CX27, and an operating voltage is applied to both ends of the series circuit (first series circuit) and a motor current flow.
  • the motor 7 starts rotating, and a closed-path operation of the switching unit 5 is started by a torque of the motor.
  • Arrows in FIG. 5(b) indicate directions in which a current flows.
  • the limit switch H opens, and excitation of the relay CX22 is cancelled and the contacts CX23, CX25, CX26, and CX27 are opened, thereby disconnecting a motor current that flows to the motor armature M and the motor field element MF ( FIG. 6 ).
  • excitation of the timer relay T is cancelled, and therefore the contact Ta is closed ( FIG. 6(a) ), the relay BX is excited, and the contacts BX32 and BX33 that are connected to the motor control circuit 8 are closed.
  • a closed loop circuit that has the motor armature M and the resistor R1 connected in series is configured in the motor control circuit 8.
  • This closed loop circuit is independent by being separated from other circuit portions.
  • a motor current is not supplied to the motor armature M, a current is induced in this closed loop circuit by inertia rotation of the self (arrows in FIG. 6(b) ), and this current is further converted to heat energy by the resistor R1. That is, although the motor armature M continues rotation by inertia, a torque generated by the motor 7 is reduced because energy of an inertia motion is converted to heat energy by the resistor R1.
  • a current that flows through a field winding of the motor field element MF is also reduced by the resistor R2 ( FIG. 6(b) ). That is, when the contact Ta is closed ( FIG. 6(a) ), the relay AX is also excited, and the contacts AX30 and Ax31 that are connected to the motor control circuit 8 are closed. Accordingly, the resistor R2 and the motor field element MF are connected in series to the motor control circuit 8, and an operating voltage is applied to their both ends. At the same time, a series circuit (a second series circuit) that is separated from the closed loop circuit described above is configured.
  • a timer setting time is set such that a circuit is disconnected when an excessive torque stops generating after a torque by the motor 7 is reduced.
  • An open-path operation can be also similarly explained.
  • the operation is started in an initial state that the limit switch L is closed and the limit switch H is opened.
  • An input signal voltage as a turn-off operation signal is applied, the relay TX20 is excited, and the contact TX21 is closed.
  • a subsequent operation can be explained in a similar manner to that of the closed-path operation. However, a direction of a current that flows to the motor armature M becomes opposite to that of the closed-path operation.
  • the operating device 2 includes the torque limiter 10 that causes the power transmission shaft of the motor 7 to slide when a torque exceeds a constant torque value. Further, because breakage of the power transmission mechanism 3 due to collision of parts occurs at the end of the open/close operation, the operating circuit 9 is controlled in a circuit configuration such that after completing an open/close operation, a braking current flows to the resistors R1 and R2 by switching the motor control circuit 8.
  • energy of an inertia motion of the motor 7 is converted to heat energy via the braking circuit that includes the resistors R1 and R2 that are configured in the motor control circuit 8, after completing a turn-on operation or an open operation.
  • the braking circuit that includes the resistors R1 and R2 that are configured in the motor control circuit 8, after completing a turn-on operation or an open operation.
  • the open/close state display mechanism 12 is arranged nearer to a main body side of the switch 1 than to the torque limiter 10. That is, the torque limiter 10 is provided between the motor 7 and the speed reduction mechanism 11, and is mounted on the power transmission shaft of the motor 7. On the other hand, the open/close state display mechanism 12 is provided at the main body side of the switch 1, and displays an open/close state of the switch 1 that is coordinated with the output shaft 13. Accordingly, even when the torque limiter 10 operates due to generation of a torque equal to or larger than that assumed in designing, the open/close state display mechanism 12 can display a state of the main body of the switch 1 because the open/close state display mechanism 12 is coordinated with the output shaft 13.
  • the open/close state display mechanism 12 When the open/close state display mechanism 12 is provided between the motor 7 and the torque limiter 10, for example, the open/close state display mechanism 12 displays an open/close state of the switch 1 that is coordinated with the power transmission shaft of the motor 7. When the torque limiter 10 operates and when rotation of the motor 7 is not transmitted to the output shaft 13, a state of the main body of the switch 1 cannot be correctly displayed.
  • FIG. 8 is a configuration diagram of a switching device that includes an operating device 52 according to a second embodiment of the present invention.
  • the operating device 52 is an electric-spring operating device that includes a spring 15 of which energy is accumulated by rotation of the motor 7.
  • Other constituent elements of the present embodiment are identical to those of the first embodiment, and thus, in FIG. 8 , constituent elements identical to those shown in FIG. 1 are denoted by like reference signs, and explanations thereof will be omitted.
  • the operating device 2 accumulates energy of the spring 15 via the speed reduction mechanism 11 by rotation of the motor 7. When the energy-accumulated spring 15 reaches a predetermined point, energy accumulation is completed, and the spring 15 releases energy and rotates the output shaft 13.
  • the operating circuit 9 according to the present embodiment is identical to that shown in FIG. 2 .
  • the motor control circuit 8 is also identical to that shown in FIG. 3 .
  • An operation in the present embodiment is explained for a closed-path operation as an example. First, the operating circuit 9 and the motor control circuit 8 rotate the motor 7 as shown in FIGS. 3 and 4 , but a closed-path operation of the switching unit 5 is not performed during accumulation of energy of the spring 15.
  • the limit switch H is opened simultaneously with the completion of energy accumulation of the spring 15, and the operating circuit 9 and the motor control circuit 8 operate as shown in FIGS. 5 and 6 . Therefore, a motor current is disconnected at the time of completing the energy accumulation of the spring 15. At the same time, energy of the spring 15 is released, and a closed-path operation of the switching unit 5 is performed by a torque of the spring 15 and by a torque due to inertia rotation of the motor 7.
  • a braking circuit that includes the resistors R1 and R2 is configured as shown in FIG. 6 , a current generated by an inertia motion of the motor 7 is suppressed, in a similar manner to that of the first embodiment. Therefore, generation of a torque in the output shaft 13 of the operating device 2 becomes small, and a force that is applied to each part of the power transmission mechanism 3 and the main body of the switch 1 is suppressed, in a similar manner to that of the first embodiment.
  • FIG. 9 is an example of time changes of a generated torque in the operating device 52 according to the present embodiment, a winding current of a motor armature, and a motor current.
  • the generated torque is a result of measurement by holding the output shaft unit 13 of the operating device 52.
  • the motor current indicates a rise near a left end of a time axis, and this is an inrush current accompanied with the start of the motor 7.
  • the motor current momentarily reduces based on an effect of the resistor R1.
  • the motor current rises and becomes at substantially a constant value at a time T2 afterward, and thereafter reduces before a timer setting time T3 and becomes almost zero.
  • the generated torque increases at the time T1. This is because a torque of inertia rotation of the motor 7 is superimposed with a torque of the energy-accumulated spring 15.
  • the generated torque becomes at a peak value at the time T2, and thereafter, rapidly reduces by a portion of heat energy that is consumed by the closed loop circuit.
  • the generated torque becomes substantially at a constant value, based on a torque of the spring 15.
  • the winding current of the motor armature also changes corresponding to a change of the generated torque.
  • a torque is designed to be generated simultaneously with the completion of energy accumulation of the spring 15 by the motor 7.
  • a torque by the inertia rotation of the motor 7 is temporarily superimposed on a torque by the spring 15, the generated torque is suppressed by electrically braking the motor 7.
  • a motor current is disconnected after completing accumulation of energy of the spring 15 by the motor 7, a subsequent torque by the motor 7 is based on inertia rotation, and a load that is applied to the power transmission mechanism 3 by the motor 7 is reduced.
  • a circuit is configured such that a braking current is generated in the motor control circuit 8 simultaneously with the completion of energy accumulation of the spring 15, a torque by the inertia rotation of the motor 7 can be reduced.
  • generation of a torque equal to or larger than that assumed in designing can be prevented.
  • Other effects of the present embodiment are identical to those of the first embodiment.
  • the present invention is useful as an operating device of a switch of a gas-insulating switch device.

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  • Mechanisms For Operating Contacts (AREA)
  • Stopping Of Electric Motors (AREA)
  • Control Of Electric Motors In General (AREA)
  • Control Of Ac Motors In General (AREA)
EP09843975.5A 2009-04-27 2009-04-27 Betriebseinrichtung Active EP2426686B9 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2009/058270 WO2010125631A1 (ja) 2009-04-27 2009-04-27 操作装置

Publications (4)

Publication Number Publication Date
EP2426686A1 true EP2426686A1 (de) 2012-03-07
EP2426686A4 EP2426686A4 (de) 2014-04-16
EP2426686B1 EP2426686B1 (de) 2017-03-29
EP2426686B9 EP2426686B9 (de) 2017-08-16

Family

ID=43031799

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09843975.5A Active EP2426686B9 (de) 2009-04-27 2009-04-27 Betriebseinrichtung

Country Status (4)

Country Link
EP (1) EP2426686B9 (de)
JP (1) JP5269189B2 (de)
CN (1) CN102388425B (de)
WO (1) WO2010125631A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5450701B2 (ja) * 2012-03-22 2014-03-26 中国電力株式会社 断路器トルク測定装置
CN106415961B (zh) * 2014-01-21 2018-09-14 三菱电机株式会社 气体绝缘开关装置以及开关器
DE102016218334B4 (de) * 2016-09-23 2020-03-05 Siemens Aktiengesellschaft Motorvorrichtung für einen Schalterantrieb eines elektrischen Schalters

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2575021A (en) * 1947-03-21 1951-11-13 Electric Controller & Mfg Co Dynamic braking of a single directcurrent series motor
US4713505A (en) * 1978-09-06 1987-12-15 Cooper Industries, Inc. Load break switch
US4912380A (en) * 1989-02-28 1990-03-27 Square D Company Field installable electrical operator for a circuit breaker
US5804930A (en) * 1996-08-22 1998-09-08 Southern Electrical Equipment Company Motor operator for a power line phase switch

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55138716A (en) 1979-04-17 1980-10-29 Matsushita Electric Ind Co Ltd Electrochromic display device
JPS59165316A (ja) * 1983-03-09 1984-09-18 三菱電機株式会社 制動回路
JPH0581957A (ja) * 1991-09-20 1993-04-02 Toshiba Corp 開閉器の操作装置
JP2002084784A (ja) * 2000-09-04 2002-03-22 Three H:Kk 電動ホイスト等における直流モーターの制動回路
JP4376809B2 (ja) * 2005-02-22 2009-12-02 株式会社日立製作所 真空スイッチギヤ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2575021A (en) * 1947-03-21 1951-11-13 Electric Controller & Mfg Co Dynamic braking of a single directcurrent series motor
US4713505A (en) * 1978-09-06 1987-12-15 Cooper Industries, Inc. Load break switch
US4912380A (en) * 1989-02-28 1990-03-27 Square D Company Field installable electrical operator for a circuit breaker
US5804930A (en) * 1996-08-22 1998-09-08 Southern Electrical Equipment Company Motor operator for a power line phase switch

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2010125631A1 *

Also Published As

Publication number Publication date
CN102388425A (zh) 2012-03-21
EP2426686B9 (de) 2017-08-16
WO2010125631A1 (ja) 2010-11-04
EP2426686B1 (de) 2017-03-29
JPWO2010125631A1 (ja) 2012-10-25
JP5269189B2 (ja) 2013-08-21
CN102388425B (zh) 2014-05-28
EP2426686A4 (de) 2014-04-16

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