EP4277057A1 - Gasisolierte schaltvorrichtung - Google Patents

Gasisolierte schaltvorrichtung Download PDF

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Publication number
EP4277057A1
EP4277057A1 EP21917458.8A EP21917458A EP4277057A1 EP 4277057 A1 EP4277057 A1 EP 4277057A1 EP 21917458 A EP21917458 A EP 21917458A EP 4277057 A1 EP4277057 A1 EP 4277057A1
Authority
EP
European Patent Office
Prior art keywords
electrode
movable electrode
movable
fixed electrode
contact
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.)
Pending
Application number
EP21917458.8A
Other languages
English (en)
French (fr)
Other versions
EP4277057A4 (de
Inventor
Tadahiro Yoshida
Toshihiro Matsunaga
Koichi Kagawa
Yuta Nakayama
Hideki Miyatake
Kenji Onishi
Yoshiki Yoshioka
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 EP4277057A1 publication Critical patent/EP4277057A1/de
Publication of EP4277057A4 publication Critical patent/EP4277057A4/de
Pending legal-status Critical Current

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Classifications

    • 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
    • H01H31/26—Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch
    • H01H31/32—Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch with rectilinearly-movable contact
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • H01H1/52—Contacts adapted to act as latches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
    • H01H1/38—Plug-and-socket contacts
    • 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
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/12—Auxiliary contacts on to which the arc is transferred from the main contacts
    • H01H33/121—Load break switches

Definitions

  • the present disclosure relates to a gas insulated switchgear.
  • a gas insulated switchgear includes a switch for interrupting current.
  • the switch includes a movable-side terminal having a movable electrode, a fixed-side terminal provided so as to be opposed to the movable-side terminal, and a driving portion for linearly driving the movable electrode toward the fixed-side terminal.
  • the fixed-side terminal has a fixed electrode, a latch portion for engaging the fixed electrode with the movable electrode, and an opening mechanism for separating the fixed electrode from the movable electrode.
  • the opening mechanism has an opening spring for driving the fixed electrode in a direction to separate from the movable electrode.
  • the driving portion drives the movable electrode in a direction to approach the fixed electrode, so as to engage the movable electrode and the fixed electrode with each other.
  • the driving portion drives the movable electrode in a direction away from the fixed electrode.
  • the fixed electrode is pulled together with the movable electrode, whereby the opening spring of the opening mechanism is contracted.
  • engagement of the latch portion is released by a restoring force of the opening spring.
  • the fixed electrode is separated from the movable electrode, whereby the switch is opened.
  • a conventional latch portion of a switch has a plate spring structure of which one end is fixed and another end has a claw portion (see, for example, Patent Document 1).
  • Patent Document 1 Japanese Laid-Open Patent Publication No. 2010-27479
  • the claw portion needs to have both a function of keeping engagement between the movable electrode and the fixed electrode against a spring load of the opening spring, and a function of releasing the engagement in accordance with the position of the fixed electrode. Therefore, because of axial misalignment between the movable electrode and the fixed electrode, change in a frictional force at the claw portion and a part engaged with the claw portion, and the like, the position where the fixed electrode is separated from the movable electrode is not stabilized, and since an engagement retaining force is weak, an opening spring having a great spring load cannot be applied, and thus the interruption speed cannot be increased.
  • the present disclosure has been made to solve the above problem, and an object of the present disclosure is to provide a gas insulated switchgear having a switch that enables adjustment of the interruption speed while stabilizing the position where the fixed electrode is separated from the movable electrode.
  • a gas insulated switchgear includes: a movable electrode; a fixed electrode provided on a same axis as the movable electrode; a driving portion which linearly drives the movable electrode in a direction of the axis so that the movable electrode contacts with/separates from the fixed electrode; and an opening mechanism which separates the fixed electrode from the movable electrode.
  • the movable electrode has a taper portion having a recessed surface toward the axis, at a part to contact with the fixed electrode, and has a protrusion protruding toward the axis, at an outer circumferential part of the taper portion.
  • the fixed electrode includes a latch portion composed of a claw having an engagement portion to be engaged with the protrusion and a slope portion to contact with the taper portion, and a contact-pressure spring applying a restoring force to the claw in a direction crossing the axis.
  • the fixed electrode includes the latch portion composed of the claw having the engagement portion to be engaged with the protrusion and the slope portion to contact with the taper portion, and the contact-pressure spring applying the restoring force to the claw in the direction crossing the axis.
  • FIG. 1 is a sectional view of a switch of a gas insulated switchgear according to embodiment 1.
  • a switch 1 of the gas insulated switchgear shown in FIG. 1 is in an opened state.
  • the switch 1 includes a flange 2, a fixed-side terminal 4 fixed to an insulation holder 3, and a movable-side terminal 5.
  • a cylindrical movable electrode rod 6 having a threaded inner circumferential surface and a columnar movable-side shaft rod 7 for linearly driving the movable electrode rod 6, are provided inside the movable-side terminal 5.
  • the movable electrode rod 6 and the movable-side shaft rod 7 are provided on the same axis, and the movable electrode rod 6 and the movable-side shaft rod 7 compose a movable electrode 8.
  • the outer circumferential surface of the movable-side shaft rod 7 is threaded for linearly driving the movable electrode rod 6.
  • An insulation rod 9 is connected to one end of the movable-side shaft rod 7.
  • the insulation rod 9 is connected to a driving portion 10.
  • a conductive spring component (not shown) is provided between the movable-side terminal 5 and the movable electrode rod 6.
  • the longitudinal direction of the movable electrode rod 6 and the movable-side shaft rod 7 provided on the same axis is referred to as an axial direction.
  • the fixed-side terminal 4 includes a base conductor 11, a cylindrical conductor 12 connected to the base conductor, a piston 13 provided inside the cylindrical conductor 12, a cylinder 14 provided between the cylindrical conductor 12 and the piston 13, a fixed electrode 15 connected to an end of the cylinder 14, and an opening spring 16 provided around the outer circumference of the cylinder 14.
  • the piston 13, the cylinder 14, and the opening spring 16 compose an opening mechanism.
  • the fixed electrode 15 is provided on the same axis as the movable electrode.
  • An electric field relaxing shield 17 is provided at an outer circumferential part of the fixed electrode 15. The electric field relaxing shield 17 is drawn out toward the movable-side terminal 5 together with the fixed electrode 15 when the fixed electrode 15 is pulled toward the movable-side terminal 5.
  • An electrode contact-pressure spring 18 is provided at an outer circumferential part of the fixed electrode 15, so as to keep contact between the movable electrode rod 6 and the fixed electrode 15 when the movable electrode rod 6 and the fixed electrode 15 are conductively in contact with each other.
  • FIG. 2 is a sectional view of the fixed electrode 15.
  • FIG. 3 is a plan view of the fixed electrode 15 as seen from A side in FIG. 2
  • FIG. 4 is a plan view of the fixed electrode 15 as seen from B side in FIG. 2 .
  • the fixed electrode 15 includes a connection rod 19 connected to the cylinder 14, a fixed-side shaft rod 20, two claws 21 radially formed in directions crossing the axial direction of the fixed-side shaft rod 20, a stopper 22 restricting movement of the claws 21 in the axial direction and the radial direction, and a contact-pressure spring 23 pushing out the claws 21 in the outer circumferential direction.
  • the two claws 21 are provided at positions opposed to each other with respect to the axis.
  • the two claws 21 and the contact-pressure spring 23 compose a latch portion 24.
  • the claws 21 are pushed out in the outer circumferential direction by the restoring force of the contact-pressure spring 23.
  • the outer periphery of each claw 21 has a circular shape, an elliptic shape, a quadrangular shape, or a shape formed by combination thereof.
  • the claw 21 has an engagement portion 21a to be engaged with a protrusion formed at the movable electrode rod as described later, and a slope portion 21b to contact with a taper portion formed at the movable-side shaft rod. As shown in FIG. 2 , the engagement portions 21a of the claws 21 have a shape protruding to the outer circumferential side.
  • the slope portions 21b of the claws 21 have such a shape that the distal end tapers toward the movable electrode side.
  • the clearance between the fixed-side shaft rod 20 and the claws 21 in the axial direction, i.e., the horizontal direction in FIG. 2 is set to be small so as to suppress wobbling of the latch portion 24.
  • the driving portion 10 rotates the insulation rod 9, for example, clockwise.
  • the movable-side shaft rod 7 rotates about the axis.
  • the movable electrode rod 6 is linearly driven rightward in FIG. 1 through meshing between the thread on the outer circumferential surface of the movable-side shaft rod 7 and the thread on the inner circumferential surface of the movable electrode rod 6.
  • FIG. 5 is a sectional view of the switch of the gas insulated switchgear according to the present embodiment, in a closed state.
  • the distal end of the movable electrode rod 6 contacts with the fixed electrode 15.
  • FIG. 6 is an enlarged sectional view of a specific part of the switch 1 in a closed state in the present embodiment.
  • a taper portion 7a having a recessed surface toward the axis is formed at the distal end of the movable-side shaft rod 7.
  • a protrusion 6a protruding toward the axis is formed on the inner circumferential surface at the distal end of the movable electrode rod 6.
  • the engagement portion 21a of each claw 21 is engaged with the protrusion 6a, so that the fixed electrode 15 and the movable electrode 8 are electrically connected to each other.
  • the driving portion 10 rotates the insulation rod 9 counterclockwise.
  • the movable-side shaft rod 7 rotates about the axis.
  • the movable electrode rod 6 is linearly driven leftward in FIG. 5 through meshing between the thread on the outer circumferential surface of the movable-side shaft rod 7 and the thread on the inner circumferential surface of the movable electrode rod 6.
  • FIG. 7 is a sectional view of the switch of the gas insulated switchgear according to the present embodiment, just before the switch is opened.
  • the fixed electrode 15 pulled by the movable electrode rod 6 linearly driven leftward enters the inside of the movable-side terminal 5, and the distal end of the fixed electrode 15 contacts with the distal end of the movable-side shaft rod 7.
  • FIG. 8 is an enlarged sectional view of a specific part where the movable-side shaft rod 7 and the fixed electrode 15 contact with each other. As shown in FIG.
  • FIG. 9 is a sectional view of the switch of the gas insulated switchgear according to the present embodiment, just before the engagement between the engagement portion 21a of each claw 21 and the protrusion 6a of the movable electrode rod 6 is released.
  • the slope portion 21b of each claw 21 is compressed along the taper portion 7a, the engagement portion 21a moves toward the inner circumferential side, so that the engagement between the engagement portion 21a and the protrusion 6a of the movable electrode rod 6 is released.
  • the fixed electrode 15 moves rightward by the restoring force of the opening spring 16 that has been compressed, so that the fixed electrode 15 is separated from the movable electrode 8.
  • electric connection between the fixed electrode 15 and the movable electrode 8 is disconnected, so that the switch 1 comes into the opened state shown in FIG. 1 .
  • the latch portion of the switch includes the claw having the engagement portion to be engaged with the protrusion of the movable electrode and the slope portion to contact with the taper portion of the movable electrode rod, and the contact-pressure spring applying the restoring force to the claw in the direction crossing the axis.
  • the force for keeping engagement between the fixed electrode and the movable electrode against the spring load of the opening spring can be adjusted by, for example, the contact angle and the contact area between the engagement portion of the claw and the protrusion of the movable electrode rod.
  • the position of the fixed electrode when the engagement is released can be adjusted by, for example, the contact angle and the contact area between the slope portion of the claw and the taper portion of the movable-side shaft rod, and the spring load of the contact-pressure spring.
  • the part bearing the function of keeping engagement between the fixed electrode and the movable electrode against the spring load of the opening spring and the part bearing the function of releasing the engagement in accordance with the position of the fixed electrode can be separated from each other, and therefore the respective functions can be adjusted without influencing each other function. Further, since the clearance between the fixed-side shaft rod 20 and the claw 21 in the axial direction is set to be small, it becomes possible to increase the load of the opening spring. Thus, the opening speed can be increased.
  • the latch portion of the switch includes the claw having the engagement portion to be engaged with the protrusion of the movable electrode and the slope portion to contact with the taper portion of the movable electrode rod, and the contact-pressure spring applying the restoring force to the claw in the direction crossing the axis.
  • the latch portion has two claws.
  • the latch portion may have three or more claws.
  • FIG. 10 is a sectional view of a fixed electrode of a switch of a gas insulated switchgear according to embodiment 2.
  • the structure of the switch in the present embodiment is the same as the structure of the switch in embodiment 1.
  • the fixed electrode 15 according to the present embodiment includes two contact-pressure springs 23 pushing out the two claws 21 in the outer circumferential direction.
  • the two contact-pressure springs 23 are respectively provided between the fixed-side shaft rod 20 and the two claws 21.
  • the function of keeping engagement between the fixed electrode and the movable electrode against the spring load of the opening spring can be borne by the engagement portion, and the function of releasing the engagement in accordance with the position of the fixed electrode can be borne by the slope portion.
  • the fixed electrode since the fixed electrode includes two contact-pressure springs 23 pushing out the two claws 21 in the outer circumferential direction, the two claws 21 can be operated independently of each other. As a result, it is possible to suppress variations in the contact pressures against the respective claws due to axial misalignment between the movable electrode and the fixed electrode, driving vibration, or the like.

Landscapes

  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Circuit Breakers (AREA)
  • Gas-Insulated Switchgears (AREA)
EP21917458.8A 2021-01-07 2021-01-07 Gasisolierte schaltvorrichtung Pending EP4277057A4 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/000291 WO2022149231A1 (ja) 2021-01-07 2021-01-07 ガス絶縁開閉装置

Publications (2)

Publication Number Publication Date
EP4277057A1 true EP4277057A1 (de) 2023-11-15
EP4277057A4 EP4277057A4 (de) 2024-02-14

Family

ID=82358117

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21917458.8A Pending EP4277057A4 (de) 2021-01-07 2021-01-07 Gasisolierte schaltvorrichtung

Country Status (4)

Country Link
EP (1) EP4277057A4 (de)
JP (1) JP7391245B2 (de)
TW (1) TWI772042B (de)
WO (1) WO2022149231A1 (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5454Y2 (de) * 1977-12-21 1979-01-05
JPH08306278A (ja) * 1995-05-10 1996-11-22 Sumitomo Wiring Syst Ltd 回路遮断器の接点構造
JP5179278B2 (ja) 2008-07-23 2013-04-10 三菱電機株式会社 開閉器

Also Published As

Publication number Publication date
WO2022149231A1 (ja) 2022-07-14
JPWO2022149231A1 (de) 2022-07-14
EP4277057A4 (de) 2024-02-14
JP7391245B2 (ja) 2023-12-04
TWI772042B (zh) 2022-07-21
TW202228173A (zh) 2022-07-16

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