EP1739701B1 - Device for controlling the opening/closing operation of an electric switchgear - Google Patents

Device for controlling the opening/closing operation of an electric switchgear Download PDF

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Publication number
EP1739701B1
EP1739701B1 EP20060012894 EP06012894A EP1739701B1 EP 1739701 B1 EP1739701 B1 EP 1739701B1 EP 20060012894 EP20060012894 EP 20060012894 EP 06012894 A EP06012894 A EP 06012894A EP 1739701 B1 EP1739701 B1 EP 1739701B1
Authority
EP
European Patent Office
Prior art keywords
operation mechanism
movable contact
electromagnet
lever
disconnection
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.)
Not-in-force
Application number
EP20060012894
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1739701A3 (en
EP1739701A2 (en
Inventor
Ayumu c/o Hitachi Ltd. Morita
Kenji c/o Hitachi Ltd. Tsuchiya
Masato c/o Hitachi Ltd. Kobayashi
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Publication of EP1739701A2 publication Critical patent/EP1739701A2/en
Publication of EP1739701A3 publication Critical patent/EP1739701A3/en
Application granted granted Critical
Publication of EP1739701B1 publication Critical patent/EP1739701B1/en
Not-in-force 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
    • 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
    • H01H2033/6667—Details concerning lever type driving rod arrangements
    • 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
    • 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
    • H01H33/6662—Operating arrangements using bistable electromagnetic actuators, e.g. linear polarised electromagnetic actuators

Definitions

  • the present invention relates to a switchgear opening/closing device which moves a movable contact to three positions, a closed position, an open position and a disconnection position.
  • a power receiving equipment is provided with a closed type switch board (referred to as a "switchgear") accommodating a vacuum circuit breaker to break a load current or circuit fault current, a disconnector and an earth switch to ensure an operator's safety upon maintenance and checkup of the load, a detection unit to detect a system voltage and current, a protection relay, and the like.
  • a switchgear a closed type switch board accommodating a vacuum circuit breaker to break a load current or circuit fault current, a disconnector and an earth switch to ensure an operator's safety upon maintenance and checkup of the load, a detection unit to detect a system voltage and current, a protection relay, and the like.
  • Patent Document 1 Japanese Published Unexamined Patent Application No. Hei 10-308145
  • a movable electric conductor and an operation driving source are coupled with a link mechanism including plural cranks, a crank arm, a link and the like. Accordingly, this link mechanism has a pivotal coupling members using a large number of pins and the like.
  • the pivotal coupling member is coated with lubricant such as grease.
  • the lubricant is solidified after elapse of a long period. As a result, the resistance at the pivotal coupling member is increased, and a high operation force is required.
  • the increase in the operation force is one of impediments to downsizing of the opening/closing device. '
  • EP-A-1005058 discloses a vacuum switchgear with the features of the preamble of present claim 1.
  • the present invention has been made in view of the above situation, and has an object to provide a switchgear opening/closing device in which the number of pivotal coupling members in the link mechanism can be reduced and the efficiency of opening/closing operation can be improved.
  • the present invention provides a switchgear opening/closing device as defined in claim 1.
  • the dependent claims relate to preferred embodiments.
  • An example provides a switchgear opening/closing device capable of switching a movable contact to a first position, a second position and a third position with respect to a fixed contact, comprising: a first operation lever interlocked with the movable contact; a shaft to which a base of the operation lever is fixed; a second operation lever coupled with the shaft; a first operation mechanism, coupled with the second operation lever, that switch-operates the movable contact to the first position, the second position and the third position; and a second operation mechanism that selectively switches between prevention of movement and movement of the movable contact from the second position to the third position by the first operation mechanism.
  • a switchgear opening/closing device capable of switching a movable contact to a closed position, an open position and a disconnection position with respect to a fixed contact, comprising: a first operation lever interlocked with the movable contact; a shaft to which a base of the operation lever is fixed; a second operation lever coupled with the shaft; a first operation mechanism, coupled with the second operation lever, that switch-operates the movable contact to the closed position, the open position and the disconnection position; and a second operation mechanism that selectively switches between prevention of movement and movement of the movable contact from the open position to the third position by the first operation mechanism.
  • a switchgear opening/closing device capable of switching a movable contact to a closed position, an open position and a disconnection position with respect to a fixed contact, comprising: a first operation lever interlocked with the movable contact; a shaft to which a base of the operation lever is fixed; a second operation lever coupled with the shaft; a first operation mechanism, coupled with the second operation lever, having an electromagnet to drive the movable contact to a closed position direction and a spring energy-stored in accordance with movement of the movable contact in the closed position direction by the electromagnet; and a second operation mechanism that selectively switches between prevention of movement and movement of the movable contact from the open position to the disconnection position by an energy-storing force of the spring in the first operation mechanism.
  • Still another example provides the electromagnet of the first operation mechanism wherein its plunger is positioned outside its fixed iron core when the movable contact is in the disconnection position, in the above-mentioned examples.
  • a still other example provides the second operation mechanism has a binding release member in contact with an end side of the second operation lever and an electromagnet that move-operates the binding release member, in the above-mentioned examples.
  • a binding release member is a disk rotatably provided on the lever operated with the electromagnet, in the above-mentioned examples.
  • binding release member which is a cam provided on the lever operated with the electromagnet, in the above-mentioned examples.
  • another example provides a device comprising: an earth switch; a third operation mechanism that operates its movable contact; and an interlock mechanism that disables power-on of the movable contact of the earth switch when the contact is in the opening position Y2, and disables actuation of the second operation mechanismwhen the earth switch is powered-on, in accordance with the second operation mechanism in any one of the above mentioned examples.
  • the movable contact and its operation mechanism are coupled via at least one lever, the number of levers and pivotal coupling members can be reduced, and the transmission efficiency of driving force by the operation mechanism can be improved. Further, as the mechanical interlock between circuit breaker and disconnector can be easily realized, the operation reliability can be improved.
  • Fig. 1 is a side view showing the embodiment of the switchgear opening/closing device of the present invention.
  • Fig. 2 is a top view of Fig. 1.
  • Fig. 1 shows a case where the switchgear is in an open state.
  • a vacuum valve 1 is connected to a power source or a load (not shown) via a fixed side feeder 2A and a movable side feeder 2B.
  • a movable contact 5 to a fixed contact 3 in the vacuum valve is stopped in three positions, a closed position Y1 for energization, an open position Y2 to break an electric current, and a disconnection position Y3 to ensure an operator's safety against a surge voltage such as thunder.
  • a vacuum container 4 comprises a ceramic cylinder 6, upper and lower end plates 7 and 8, and a bellows 9.
  • the operation of the movable contact 5 is enabled while a vacuum-tight state is maintained with the bellows 9.
  • a movable conductor 10 and the movable side feeder 2B are coupled via a flexible conductor 11, such that energization performance upon operation is ensured.
  • an insulation rod 12 Upon coupling between a vacuum valve 1 and a 3-position operation mechanism 30, an insulation rod 12 is inserted so as to electrically separate a main circuit from a mechanism part.
  • a contact pressure spring 13 to apply a contact load to the contact is included in the insulation rod 12.
  • a 3-phase switchgear is described, however, the present invention is applicable to a single-phase opening/closing device.
  • the 3-position operation mechanism 30 comprises a first shaft 31, a first operation mechanism 40 for switch operation between the closed position Y1 and the open position Y2, and a second operation mechanism 70 for switch operation between the open position Y2 and the disconnection position Y3.
  • the first operation mechanism 40 has an electromagnet 41 and a trip spring 42.
  • a coupling member 43 to allow circular motion of the operation lever 44 and linear motion of the electromagnet 41 by rotation of the first shaft 31 is provided.
  • the second operation mechanism 70 comprises a roller operation mechanism 73 and an electromagnet 71 as its driving source.
  • a lever 75 is supported rotatably about a shaft 76, and a roller 72 is provided at one end of the lever 75 rotatably with a pin 78.
  • the roller 72 is in contact with a stopper pin 81 provided on the end side of a disconnection lever 80.
  • the rear anchor of the disconnection lever 80 is fixed to the first shaft 31.
  • the other end of the above-described lever 75 is coupled with the electromagnet 71.
  • the electromagnet 71 and the lever 75 are coupled via a coupling member 74 for linear motion of the electromagnet 71 and circular motion of the lever 75.
  • a bearing 77 of a shaft 76 is fixed to an upper part of the electromagnet 71.
  • a movable iron core comprising a plunger 50 and a movable flat plate 51, has a T-shaped cross section.
  • a stainless rod 52 is inserted through the plunger 50 and the movable flat plate 51, and fixed to the plunger 50 and the movable flat plate 51 with a nut 53.
  • a fixed iron core comprises an upper iron core 54, a side leg steel pipe 55, a central leg 56, and a permanent magnet bed 57.
  • a coil 65 is provided inside the fixed iron core.
  • the plunger 50 is inserted through the center of the coil 65.
  • a ring-shaped permanent magnet 58 is attached to the permanent magnet bed 57 so as to be opposite to the movable flat plate 51.
  • a steel pipe 59 to reduce leak magnetic flux to the outside the electromagnet is provided around the permanent magnet 58.
  • the upper iron core 54, the side leg steel pipe 55, the permanent magnet bed 57, the steel pipe 59 and a lower steel plate 60 are held with a bolt 61 and a nut 62 and assembled to the electromagnet 41.
  • the trip spring 42 is held between a member 63 and the lower steel plate 60 provided at an end (lower end in Fig. 3 ) of the stainless rod 52.
  • the member 63 is fixed to the stainless rod 52 with a nut 64.
  • a fixed iron core comprises three steel plates 85, 86 and 87, and two steel pipes 88 and 89.
  • Two coils 90 and 91 are provided inside the core.
  • a plunger 92 moves in upward and downward directions.
  • the plunger 92 is fixed to an operation shaft 93.
  • the upper end of the operation shaft 93 is coupled with the other end of the lever 75.
  • a return spring 94 is provided between the steel plate 85 and the plunger 92.
  • an earth switch 100 is provided in the fixed side feeder 2A of the respective vacuum valves 1 shown in Figs. 1 and 2 .
  • a movable contact 101 with respect to a fixed contact of the earth switch 100 is movably-operated by an earth switch operation mechanism 102.
  • the earth switch operation mechanism 102 comprises a second shaft 103 provided in parallel with the first shaft 31, a contact lever 104 provided on the second shaft 103, a ground lever 105 provided on the second shaft 103, a coupling rod 106 to couple the contact lever 104 with the movable contact 101, and an electromagnet 107 coupled with the ground lever 105.
  • the electromagnet 107 in the earth switch operation mechanism 102 is coupled with the operation shaft 93 of the electromagnet 71 in the above-described second operation mechanism 70 via an interlock mechanism 108.
  • the interlock mechanism 108 enables power-on of the movable contact 101 to the fixed contact of the earth switch 100 with the electromagnet 107.
  • the interlock mechanism 108 disables power-on of the movable contact 101 to the fixed contact of the earth switch 100 with the electromagnet 107.
  • the interlock mechanism 108 disables actuation of the electromagnet 71 in the second operation mechanism 70.
  • the interlock mechanism 108 comprises a pin 110 provided at a lower end of the operation shaft 109 of the electromagnet 107, an interlock shaft 111 provided in parallel with the second shaft 103 below the electromagnet 107, a lever 112 provided on the shaft 111 and coupled with a lower end of the operation shaft 93 of the electromagnet 71 in the second operation mechanism, and two levers 113 and 114 provided on the shaft 111 and engaged with the pin 110.
  • Fig. 6 shows a state where the movable contact 5 in the vacuum valve 1 is set in the open position Y2 to break an electric current.
  • the first operation mechanism 40 always applies a clockwise rotation force to the disconnection lever 80 provided on the first shaft 31 with its trip spring 42 via the coupling member 43.
  • the stopper pin 81 provided on the disconnection lever 80 is in contact with the roller 72, which suppresses further clockwise rotation by the trip spring 42. That is, movement from the open position Y2 to break an electric current to the disconnection position Y3 to ensure the operator's safety against a surge voltage such as thunder can be prevented.
  • an interference point P by the contact between the stopper pin 81 and the roller 72 is set to be on the opposite side to the electromagnet 71 with respect to a straight line connecting the rotation shaft 78 of the roller 72 with the shaft 76 of the lever 75. Accordingly, the lever 75 receives a counterclockwise rotation force to its shaft 76.
  • the position of the interference point P i.e., the open position Y2 is regulated. Further, the open position Y2 can be adjusted with the number of thin plates 95 provided on a bearing fixing member of the shaft 76.
  • a holding force to resist the energy-storing force of the trip spring 42 and the contact pressure spring 13 is required of the first operation mechanism 40.
  • the attraction force of the permanent magnet 58 in the first operation mechanism 40 i.e. a so-called magnetic latch is applied.
  • attraction forces Fp and Fp1 act on the plunger 50 and the movable flat plate 51 by a magnetic flux ⁇ made by the permanent magnet 58 in the electromagnet 41.
  • the total sum Fp + Fp1 is set to a level equal to or higher than the above-described spring energy-storing force so as to maintain the state in the closed position Y1.
  • an electric interlock is provided to prevent the operation of the second operation mechanism 70 to disable the disconnection operation when the switchgear is in the closed state.
  • a mechanical interlock is also provided on the premise of failure of the electric interlock.
  • the interference by the contact between the stopper pin 81 and the roller 72 is cleared in the closed state, such that even if the second operation mechanism 70 operates, the first shaft 31 and the movable contact 5 are not influenced. That is, one of the mechanical interlocks between the circuit breaker and the disconnector, "when the movable contact is in the closed position, the disconnection operation is disabled" is automatically realized.
  • the energy-storing force of the trip spring 42 and the contact pressure spring 13 is utilized.
  • a tripping operation of the magnetic latch will be described using Fig. 10 .
  • the coil 65 in the electromagnet 41 is excited in an opposite direction to that upon power-on operation, to cancel the magnetic flux ⁇ of the permanent magnet 58, and reduce the attraction force to act between the plunger 50 and the central leg 56.
  • the attraction force FP1 to act on the movable flat plate 51, not depending on the excitation of the coil 45, is almost constant.
  • the plunger 50 starts operation downward in the figure, to restore the open state shown in Fig. 6 .
  • connection operation from the open position Y2 to the disconnection position Y3 by the second operation mechanism 70 will be described using Fig. 11 .
  • Fig. 11 shows a state after the movement, i.e., the disconnection state.
  • the clockwise rotation force always acts on the first shaft 31 by the trip spring 42 of the first operation mechanism 40. Accordingly, the stopper pin 81 and the roller 72 are always in contact point with each other during the disconnection operation. The contact, i.e., the interference point P is shifted downward in the figure by the movement of the roller 72.
  • the disconnection position Y3 is regulated with a position where the plunger 92 and the steel plate 85 of the electromagnet 71 collide with each other. That is, when a bidirectionally movable electromagnet is employed in the second operation mechanism 70, the interval between the open position Y2 and the disconnection position Y3 is automatically regulated with the operation range of the electromagnet, thereby an adjusting mechanism is not required. Further, the contact between the stopper pin 81 and the roller 72 is employed for smooth disconnection operation with reduced friction upon movement.
  • the plunger 50 of the electromagnet 41 in the first operation mechanism 40 exists lower than the permanent magnet bed 57, i.e., outside the fixed iron core. Accordingly, even if the coil 65 is excited in the disconnection state, there is almost no magnetic flux passing through the plunger 50 and no attraction force occurs. That is, the mechanical interlock between the circuit breaker and the disconnector, "when the movable contact is in the disconnection position, the power-on operation is disabled" is realized.
  • a freely-rotatable roller 72 is used in the roller operation mechanism 73 of the second operation mechanism 70, however, the roller 72 may be replaced with a partially-circular shaped cam.
  • electromagnet 41 of the first operation mechanism 40 and the electromagnet 71 of the second operation mechanism 70 are arranged below the disconnection lever 80, however, these electromagnets 41 and 71 may be arranged above the disconnection lever 80 as shown in Fig. 13 .
  • the operation rod is coupled with an intermediate part of the disconnection lever 80.
  • the electromagnet 71 of the second operation mechanism 70 may be arranged in a direction orthogonal to the actuation direction of the electromagnet 41 in the first operation mechanism 40. Further, the electromagnetic operation system is applied to the first operation mechanism 40, however, other operation system such as electric spring system may be employed.
  • the second operation mechanism 70 for disconnection operation is provided in the first operation mechanism 40, the operation characteristic of the first operation mechanism 40 does not change from that in the case of 2-position operation mechanism.
  • the problem in the conventional devices such as degradation of transmission efficiency of operation force can be solved.
  • the stopper pin 81 and the roller 72 do not interfere with each other in the closed state, even if the electric interlock is broken and the second operation mechanism 70 is operated, only the position of the roller 72 changes but the first shaft 31 and the movable contact 5 are not influenced. That is, one of the mechanical interlocks between the circuit breaker and the disconnector, "when the movable contact is in the closed position, the disconnection operation is disabled" is automatically realized.
  • the plunger 50 of the electromagnet 41 in the first operation mechanism 40 exists outside the fixed iron core in the disconnection state, even if the electromagnet 41 is excited, no attraction force acts and the power-on operation is not performed. That is, the other one of the mechanical interlocks "when the movable contact is in the disconnection position, the power-on operation is disabled" is also realized. That is, according to the 3-position operation mechanism 30 of the present invention, the efficiency of the first operation mechanism, of which a large current input and disconnection duty are required, is improved, and further, the link member for mechanical interlock between the circuit breaker and the disconnector is not required. Accordingly, downsizing, and further, the reliability, can be improved.

Landscapes

  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Gas-Insulated Switchgears (AREA)
EP20060012894 2005-06-29 2006-06-22 Device for controlling the opening/closing operation of an electric switchgear Not-in-force EP1739701B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005189829A JP4174495B2 (ja) 2005-06-29 2005-06-29 スイッチギヤの開閉装置

Publications (3)

Publication Number Publication Date
EP1739701A2 EP1739701A2 (en) 2007-01-03
EP1739701A3 EP1739701A3 (en) 2009-03-04
EP1739701B1 true EP1739701B1 (en) 2011-08-10

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EP20060012894 Not-in-force EP1739701B1 (en) 2005-06-29 2006-06-22 Device for controlling the opening/closing operation of an electric switchgear

Country Status (6)

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EP (1) EP1739701B1 (zh)
JP (1) JP4174495B2 (zh)
CN (1) CN1892955B (zh)
HK (1) HK1098247A1 (zh)
SG (1) SG128647A1 (zh)
TW (1) TW200719373A (zh)

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JP4951597B2 (ja) * 2008-08-11 2012-06-13 株式会社日立製作所 遮断器
JP5542545B2 (ja) 2009-11-24 2014-07-09 パナソニック株式会社 断路器
CN102656655B (zh) 2010-01-13 2015-02-11 三菱电机株式会社 电磁操作方式开关装置
JP5275301B2 (ja) * 2010-08-12 2013-08-28 株式会社日立製作所 気中遮断器
DE112011104456T5 (de) * 2010-12-20 2013-09-19 Mitsubishi Electric Corp. Leistungs-Schaltvorrichtung
CN103050329A (zh) * 2013-01-05 2013-04-17 许昌永新电气股份有限公司 一种旋转式接地开关
US9530579B2 (en) * 2013-12-26 2016-12-27 Mitsubishi Electric Corporation Bypass switch
JP6406376B2 (ja) * 2017-03-13 2018-10-17 オムロン株式会社 スイッチ
CN109490934B (zh) * 2018-12-19 2022-11-25 上海平高天灵开关有限公司 一种真空灭弧室x射线检测平台
ES1243729Y1 (es) * 2020-02-19 2021-04-28 Quijada Pablo Paunero Dispositivo de seguridad y base tripolar
CN118117479B (zh) * 2024-03-15 2024-07-30 昆山盛英电气有限公司 一种机械配合的互锁手车结构及配电开关柜

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Also Published As

Publication number Publication date
CN1892955A (zh) 2007-01-10
JP2007012362A (ja) 2007-01-18
SG128647A1 (en) 2007-01-30
TW200719373A (en) 2007-05-16
HK1098247A1 (en) 2007-07-13
TWI329881B (zh) 2010-09-01
CN1892955B (zh) 2015-04-15
EP1739701A3 (en) 2009-03-04
JP4174495B2 (ja) 2008-10-29
EP1739701A2 (en) 2007-01-03

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