WO2017010066A1 - Interrupteur pour système de puissance - Google Patents

Interrupteur pour système de puissance Download PDF

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Publication number
WO2017010066A1
WO2017010066A1 PCT/JP2016/003234 JP2016003234W WO2017010066A1 WO 2017010066 A1 WO2017010066 A1 WO 2017010066A1 JP 2016003234 W JP2016003234 W JP 2016003234W WO 2017010066 A1 WO2017010066 A1 WO 2017010066A1
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WO
WIPO (PCT)
Prior art keywords
pressure chamber
closed
conductor
pressure
moving direction
Prior art date
Application number
PCT/JP2016/003234
Other languages
English (en)
Japanese (ja)
Inventor
永田　寿一
網田　芳明
丹羽　芳充
正将 安藤
和長 金谷
Original Assignee
株式会社 東芝
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 株式会社 東芝 filed Critical 株式会社 東芝
Publication of WO2017010066A1 publication Critical patent/WO2017010066A1/fr

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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
    • 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
    • H01H33/662—Housings or protective screens
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
    • H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
    • H02B13/025—Safety arrangements, e.g. in case of excessive pressure or fire due to electrical defect
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
    • H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
    • H02B13/035—Gas-insulated switchgear

Definitions

  • Embodiments of the present invention relate to a circuit breaker that opens and closes an electric circuit of a power system, and more particularly to a circuit breaker that opens and closes an electric circuit in a vacuum.
  • a circuit breaker capable of interrupting a current flowing through an electric circuit of an electric power system generally constitutes an electric circuit of an electric power system, and a conductor through which an electric current flows, a so-called conductive part, and a fixed contact and the fixed contact
  • a movable contact that can move linearly in a predetermined direction (hereinafter referred to as a moving direction) so as to approach and separate from the movable contact, and is coupled to the movable contact and extends in the moving direction and is driven by an operation mechanism. It has an operating rod that moves together with the movable contact.
  • the operation rod usually has a portion made of an electrical insulator (hereinafter referred to as an insulation portion) in order to prevent a current from flowing between the movable contact and the operation mechanism.
  • an electrical insulator hereinafter referred to as an insulation portion
  • Such a circuit breaker includes a so-called vacuum circuit breaker that interrupts the current in vacuum.
  • a circuit breaker has a vacuum chamber, which is a vacuum space, and has a container (hereinafter referred to as a vacuum container) that accommodates a stationary contact and a movable contact in the vacuum chamber. Yes.
  • the operation rod described above extends inside the vacuum vessel.
  • the vacuum vessel accommodates a substantially cylindrical and bellows-shaped member, a so-called bellows, together with a stationary contact and a movable contact.
  • the bellows is a part of a vacuum interrupter (also referred to as a vacuum valve) as well as a vacuum vessel, a stationary contact, and a movable contact.
  • the bellows surrounds the outside of the operation rod in the radial direction in the vacuum vessel, and usually the end on the open side in the moving direction is connected to the vacuum vessel, and the end on the close side in the moving direction is operated. It is connected to the rod.
  • the bellows is configured to expand and contract in the movement direction according to the movement of the movable contact and the operation rod.
  • the bellows defines a vacuum chamber together with the vacuum container, the inner peripheral surface on the radially inner side faces the operating rod, and the outer peripheral surface on the radially outer side faces the vacuum chamber. For this reason, the force resulting from the pressure difference between the inside and the outside acts on the bellows.
  • the bellows is composed of a relatively thin stainless steel plate or the like so that it can easily expand and contract in the moving direction. Further, the bellows is generally manufactured on the assumption that the inside is used in an environment where the atmospheric pressure is about atmospheric pressure. For this reason, the bellows has a relatively low strength among the components of the circuit breaker, and it is difficult to improve the strength significantly due to its structure.
  • the pressure acting on the inside of the bellows is preferably about atmospheric pressure, and it is desired to be 0.2 MPa or less.
  • the electrical insulation such as the insulation portion of the operating rod is filled in a space filled with a relatively high electrical insulation gas such as an inert gas.
  • the body is required to be placed.
  • Such an electrical insulator is housed in a container (hereinafter, referred to as a pressure container) filled with an insulating gas together with the above-described vacuum container.
  • a gas chamber which is a space filled with an insulating gas at a predetermined pressure, is formed inside the pressure vessel, and an insulating portion of the operating rod is disposed in the gas chamber. As the pressure of the insulating gas is increased, the electrical insulation performance in the insulating portion can be improved.
  • the pressure of the relatively high-pressure insulating gas acts on the inside of the bellows, and the vacuum on the outside
  • the pressure difference with the chamber becomes large.
  • the pressure of the insulating gas is made relatively low in order to reduce the pressure difference
  • the length in the moving direction of the insulating portion of the operating rod is made relatively long in order to ensure electrical insulation performance. Need arises. Increasing the length of the operating rod in the moving direction increases the mass and the operating force required to drive the operating rod increases. As a result, there arises a problem that the dimension of the circuit breaker in the moving direction becomes large.
  • the embodiment of the present invention has been made in view of the above circumstances, and that a high pressure difference acts on the bellows in the pressure vessel while making the dimension of the movable contact in the moving direction compact. It aims at providing the circuit breaker which can be controlled.
  • the power system circuit breaker includes a fixed contact, a closed position in contact with the fixed contact, and an open position that is separated from the fixed contact.
  • a movable contact that can move linearly in the moving direction, a vacuum chamber inside, a vacuum vessel that accommodates the fixed contact and the movable contact in the vacuum chamber, and a moving direction from the vacuum vessel in the moving direction.
  • An open-side conductor electrically connected to the movable contact extends from the movable contact through the open-side conductor in the moving direction, and is driven by an operating mechanism to Move together with the movable contact
  • An operating rod that moves in the direction and an electrical insulator is arranged radially outside the vacuum vessel, and extends in the movement direction between the closed-side conductor and the open-side conductor
  • an interelectrode insulator that defines a central low-pressure chamber filled with an insulating gas or air, and the movement that is disposed radially outside the operating rod in the vacuum vessel and coupled to the vacuum vessel
  • An open end in the direction and a close end in the moving direction coupled to the operating rod, and the vacuum chamber is partitioned from the central low pressure chamber, and according to the movement of the operating rod
  • Delimiting insulating cylinder A high-pressure chamber filled with an insulating gas at a higher pressure than the central low-pressure chamber and the closed-side low-pressure chamber, and the open-side conductor, the interelectrode insulator, the closed-side in the high-pressure chamber
  • a pressure vessel containing the conductor and the insulating cylinder, and the operating rod is made of an electrical insulator, and the insulating portion faces the high-pressure chamber on the opening side in the moving direction from the opening-side conductor.
  • the insulating cylinder is coupled to a closed end of the pressure vessel in the moving direction, the closed low pressure chamber extends to the end, and the closed conductor is An internal communication hole for communicating the central low-pressure chamber and the closed-side low-pressure chamber is provided inside.
  • FIG. 1 is a sectional elevation view showing the overall configuration of the circuit breaker of the present embodiment.
  • FIG. 1 shows a state where the movable contact and the operation rod are located at a closed position. Further, in FIG. 1, hatching is omitted for the pressure vessel, the operation mechanism, and the like for easy understanding.
  • FIG. 2 is an enlarged cross-sectional view showing the peripheral configuration of the vacuum vessel and the bellows in the circuit breaker of the present embodiment.
  • FIG. 3 is an enlarged cross-sectional view showing the peripheral configuration of the operating rod and the open side end plate in the circuit breaker of the present embodiment.
  • the vertical upper side is indicated by an arrow U
  • the vertical lower side is indicated by an arrow D.
  • FIG. 3 shows a state in which the movable contact and the operating rod are in the open position.
  • the movable contact 50 and the operation rod 52 have a substantially cylindrical shape and are provided coaxially.
  • a common axis of the movable contact 50 and the operation rod 52 is indicated by a one-dot chain line A.
  • the movable contact 50 and the operation rod 52 move linearly in a direction along the axis, the so-called axial direction.
  • the moving direction matches the axial direction of the movable contact 50 and the operation rod 52.
  • the direction in which the movable contact 50 and the operating rod 52 are separated from the fixed contact 20 among the moving directions is indicated by an arrow A ⁇ b> 1 as “open side in the moving direction”, and the movable contact 50 and the operating rod 52 are indicated.
  • the moving direction is an “operation direction” in which the movable contact 50 and the operation rod 52 are operated by the operation mechanism, and is an “operation direction” in which the movable contact 50 and the operation rod 52 are operated by the operation. That is, the movement direction of the present embodiment is also referred to as an axial direction, an operation direction, or an operation direction.
  • the circuit breaker 1 is a switching device that opens and closes an electric circuit of a power system.
  • the circuit breaker is a circuit breaker that opens and closes an electric circuit (cuts off an electric current) in a vacuum. It is a vacuum circuit breaker.
  • the circuit breaker 1 is also a gas-insulated switchgear.
  • the circuit breaker 1 has a pressure vessel 3 that houses a conductor that is a part of an electric circuit of a power system, a so-called conductive part.
  • the electric current of the electric power system which flows through an electroconductive part is described as a "main current" below.
  • the pressure vessel 3 has a space (hereinafter referred to as a high pressure chamber) 5 filled with an insulating gas.
  • the pressure vessel 3 is a metal outer shell that surrounds the conductive portion, a so-called enclosure.
  • the pressure vessel 3 is made of a metal such as an aluminum alloy and is electrically grounded (grounded).
  • the pressure vessel 3 has a central portion 3a surrounding the conductive portion, an opening side end portion 3c in the moving direction, and a closing side end portion 3e in the moving direction.
  • the circuit breaker 1 has a leg portion 2 that supports the pressure vessel 3 with respect to a horizontal installation surface (not shown) on the vertical lower side of the central portion 3 a of the pressure vessel 3. The circuit breaker 1 is installed so that the moving direction is horizontal.
  • the high-pressure chamber 5 is filled with an inert gas having a relatively high electrical insulation, so-called insulating gas.
  • the high pressure chamber 5 is filled with sulfur hexafluoride (SF 6 ) as an insulating gas.
  • sulfur hexafluoride SF 6
  • nitrogen (N 2 ), carbon dioxide (CO 2 ), or dry air (dry air) can be used as the insulating gas filled in the high-pressure chamber 5.
  • the high pressure chamber 5 may be filled with sulfur hexafluoride, nitrogen, carbon dioxide, or dry air as an insulating gas.
  • two or more kinds of mixed gases of sulfur hexafluoride, nitrogen, carbon dioxide, and dry air can be used as the insulating gas.
  • the high pressure chamber 5 is filled with an insulating gas at a pressure in the range of 0.4 MPa to 0.8 MPa. In this embodiment, the insulating gas is filled at a pressure of about 0.6 MPa.
  • the pressure vessel 3 is sealed in a state where the high-pressure chamber 5 is filled with an insulating gas at a predetermined pressure within the above-described range.
  • the high-pressure chamber 5 is filled with an insulating gas at a higher pressure than the central low-pressure chamber 44 and the closed-side low-pressure chamber 33 described later.
  • the pressures of the insulating gas and air are all indicated by gauge pressure (differential pressure with respect to outside air).
  • the pressure vessel 3 accommodates a vacuum interrupter (also referred to as a vacuum valve) 10 in the center thereof.
  • the vacuum interrupter 10 includes a fixed contact 20 and a movable contact 50 that are conductive parts of an electric circuit of a power system, and a vacuum container 11 that houses the fixed contact 20 and the movable contact 50.
  • the vacuum vessel 11 has a vacuum space (hereinafter referred to as a vacuum chamber) 15 in which the fixed contact 20 and the movable contact 50 are disposed.
  • the vacuum vessel 11 is supported with respect to the pressure vessel 3 via an electrical insulator.
  • the movable contact 50 contacts the fixed contact 20 at the closed position shown in FIG.
  • the movable contact 50 is separated from the fixed contact 20 at the open position shown in FIG.
  • the movable contact 50 moves linearly in the movement direction between the closed position and the open position.
  • the movable contact 50 is configured to be movable to the opening side in the movement direction indicated by an arrow A1 in the drawing so as to be separated from the fixed contact 20.
  • An operation rod 52 is coupled to the movable contact 50.
  • the fixed contact 20 and the movable contact 50 are made of copper or an alloy containing copper.
  • the direction opposite to the opening side in the moving direction that is, the direction in which the movable contact 50 approaches the fixed contact 20 is referred to as “the closing side in the moving direction” and is indicated by an arrow A2 in the figure.
  • the operating rod 52 extends substantially linearly from the movable contact 50 to the opening side in the moving direction through the inside of the vacuum vessel 11 and the opening side conductor described later.
  • the operating rod 52 is driven in the moving direction by an operating mechanism 57 that operates the movement of the movable contact 50.
  • the operating rod 52 has an insulating portion 55 that is a portion made of an electrical insulator on the opening side in the moving direction.
  • the insulating portion 55 has a substantially rod shape and is also referred to as an “insulating rod”.
  • a material constituting the insulating portion 55 a fiber reinforced plastic having electrical insulation is used.
  • a composite material using an aramid fiber as a reinforcing material and an epoxy resin as a base material is used.
  • any material having electrical insulation can be used as the reinforcing material.
  • glass fiber or polyester fiber can be used as the reinforcing material.
  • the operating mechanism 57 is disposed outside the pressure vessel 3.
  • the operation mechanism 57 is disposed outside the opening-side end portion 3 c in the moving direction of the pressure vessel 3, and is specifically disposed in the operation box 7 that houses the operation mechanism 57.
  • the operating rod 52 is driven by the operating mechanism 57 and moves together with the movable contact 50 in the moving direction.
  • the operation rod 52 extends through an open side end plate 62 described later and an open side in the moving direction of the vacuum vessel 11.
  • the vacuum vessel 11 is made of an electrical insulator, and has a substantially cylindrical portion (hereinafter referred to as an insulating cylindrical portion) 11 a that is coaxial with the operating rod 52, and an insulating cylinder. It has ends (so-called end plates) 11c and 11e that are coupled to both ends of the moving portion 11a in the moving direction and are substantially disc-shaped coaxially with the operating rod 52. Specifically, the vacuum vessel 11 has an open side end portion 11c coupled to the open side in the moving direction of the insulating cylindrical portion 11a, and a closed side end portion 11e coupled to the close side in the moving direction. Yes.
  • the insulating cylindrical portion 11a is generally made of ceramics.
  • the opening side end portion 11c and the closing side end portion 11e are generally made of a metal material, and in the present embodiment, are made of stainless steel.
  • the open side end 11c of the vacuum vessel 11 has a through hole 13 through which the operation rod 52 passes.
  • An opening-side end 12 c in the moving direction of the bellows 12 is coupled to the opening-side end portion 11 c in the vicinity of the through hole 13.
  • An end 12e on the closing side in the moving direction of the bellows 12 is coupled to the operation rod 52. That is, the bellows 12 has an open end 12c coupled to the vacuum vessel 11 in the moving direction and a closed end 11a coupled to the operation rod 52.
  • the bellows 12 has a substantially cylindrical and bellows shape whose axial center extends in the moving direction, and is accommodated in a vacuum chamber 15 in the vacuum vessel 11.
  • the bellows 12 is disposed radially outside the operation rod 52 in the vacuum container 11 and surrounds the operation rod 52.
  • the bellows 12 defines a vacuum chamber 15 together with a vacuum vessel 11 including an insulating cylindrical portion 11a, an opening side end portion 11c, and a closing side end portion 11e.
  • the bellows 12 expands and contracts in the movement direction according to the movement of the movable contact 50 and the operation rod 52 in the movement direction.
  • the bellows 12 is made of stainless steel having a thickness of about 0.3 mm.
  • the side of the bellows 12 facing the vacuum chamber 15 is hereinafter referred to as “outside” and the opposite side is referred to as “inside”.
  • the bellows 12 has a radially inner surface (hereinafter simply referred to as an “inner surface”) 12 a facing the operating rod 52, and a radially outer surface (hereinafter simply referred to as an “outer surface”) 12 b. It faces the insulating cylindrical portion 11a of the vacuum vessel 11.
  • the outer surface 12b faces the vacuum chamber 15, and the inner surface 12a faces the central low pressure chamber 44 shown in FIG. That is, the bellows 12 partitions the vacuum chamber 15 from the central low pressure chamber 44.
  • a force resulting from a pressure difference between the pressure acting on the outer surface 12 b and the pressure acting on the inner surface 12 a acts on the bellows 12.
  • the stationary contact 20 is accommodated facing the movable contact 50 on the closed side in the moving direction in the vacuum chamber 15 of the vacuum vessel 11.
  • the fixed contact 20 has a substantially cylindrical shape coaxially with the operation rod 52, and a conductor (hereinafter referred to as a cylindrical conductor) 21 constituting the above-described conductive portion is coupled thereto.
  • the cylindrical conductor 21 extends in the moving direction through the closed end 11 e of the vacuum vessel 11.
  • the columnar conductor 21 is a conductor (hereinafter referred to as “closed”) that extends in a radial direction perpendicular to the moving direction on the closing side in the moving direction from the stationary contact 20 and the vacuum vessel 11. (Referred to as a side end plate).
  • the closing side end plate 22 is a conductor constituting the conductive portion, and is coupled to the closing side end in the moving direction of the interelectrode insulator 40 as shown in FIG.
  • the conductor on the closed side is hereinafter referred to as “closed side conductor”.
  • a conductor constituting the conductive portion and coupled to the movable contact 50 and located on the open side in the moving direction from the movable contact 50 will be referred to as an “open side conductor” below.
  • the closed-side conductor and the open-side conductor are made of a metal material having relatively high conductivity, for example, an aluminum alloy.
  • the portion of the operation rod 52 described above that is closer to the moving direction than the insulating portion 55 is a part of the open-side conductor.
  • the open-side conductor is a conductor having a substantially disc shape (hereinafter referred to as an open-side end plate) extending in the radial direction perpendicular to the moving direction on the opening side in the moving direction from the movable contact 50 and the vacuum vessel 11. 62).
  • the open side end plate 62 is a conductor constituting the conductive portion, specifically, an open side conductor, and is coupled to the open side end of the interelectrode insulator 40 in the moving direction.
  • the interelectrode insulator 40 is made of an electrical insulator, and in this embodiment, is made of an epoxy resin.
  • the interelectrode insulator 40 is disposed on the radially outer side of the vacuum vessel 11 and surrounds the vacuum vessel 11.
  • the opening end plate 62 and the closing end plate 22 extend in the moving direction.
  • the interelectrode insulator 40 has a substantially cylindrical shape coaxially with the vacuum vessel 11, the operation rod 52, and the columnar conductor 21.
  • a central low pressure chamber 44 that is a space filled with an insulating gas at a lower pressure than the high pressure chamber 5 described above is formed on the inner side in the radial direction of the interelectrode insulator 40.
  • the inter-electrode insulator 40 defines a central low-pressure chamber 44 together with the open side end plate (open side conductor) 62, the closed side end plate (closed side conductor) 22, the vacuum vessel 11 and the bellows 12.
  • the circuit breaker 1 of the present embodiment has an electrical resistance on the radially outer side of the inter-electrode insulator 40, and includes an open side end plate (open side conductor) 62, a closed side end plate (closed side conductor) 22,
  • An inter-electrode resistor 46 extending in the moving direction along the inter-electrode insulator 40 is provided.
  • the interelectrode resistor 46 is disposed on the radially outer side of the vacuum vessel 11 and surrounds the vacuum vessel 11 and the interelectrode insulator 44.
  • the interelectrode resistor 46 has a substantially cylindrical shape.
  • the interelectrode resistor 46 for example, a wire made of an alloy containing chromium as a main component of nickel, that is, a so-called nichrome wire is wound and impregnated with a synthetic resin such as an epoxy resin and molded.
  • the interelectrode resistor 46 has a higher electrical resistance than a so-called conductor or semiconductor.
  • the inter-electrode resistor 46 is configured so that a slight current flows when a high voltage is applied between the closed-side end plate 22 and the open-side end plate 62. Yes.
  • a member (hereinafter referred to as an insulating cylinder) 30 made of an electrical insulator and supporting the closing side end plate 22 with respect to the pressure vessel 3 is provided on the closing side in the moving direction of the closing side end plate 22 .
  • the insulating cylinder 30 has a substantially cylindrical shape, and is provided coaxially with the operation rod 52, the columnar conductor 21, and the interelectrode insulator 40.
  • the insulating cylinder 30 extends from the closing side end plate 22 to the closing side in the moving direction, and is coupled to the closing side end 3 e in the moving direction of the pressure vessel 3.
  • the insulating cylinder 30 insulates the closed side end plate 22 from the pressure vessel 3 and supports the closed side end plate 22 with respect to the pressure vessel 3.
  • the insulating cylinder 30 has a space 33 (hereinafter referred to as a closed-side low-pressure chamber) filled with an insulating gas at a lower pressure than the high-pressure chamber 5 described above on the radially inner side.
  • the insulating cylinder 30 and the closing side low-pressure chamber 33 extend in the moving direction between the closing side end plate 22 in the moving direction of the pressure vessel 3 and the closing side end plate 22.
  • the insulating cylinder 30 defines a closed-side low-pressure chamber 33 together with a closed-side end 3 e in the moving direction of the pressure vessel 3 and a closed-side end plate (closed-side conductor) 22.
  • the insulating cylinder 30, the open-side conductor, the interpolar insulator 40, and the close-side conductor are disposed in the high-pressure chamber 5 and are accommodated in the pressure vessel 3.
  • the closing side end plate 22 between the closing side low pressure chamber 33 and the central low pressure chamber 44 has a communication hole (hereinafter, referred to as a communication hole) that allows the closing side low pressure chamber 33 and the central low pressure chamber 44 to communicate with each other.
  • a communication hole a communication hole that allows the closing side low pressure chamber 33 and the central low pressure chamber 44 to communicate with each other.
  • a plurality of internal communication holes 32 the closed-side low pressure chamber 33 and the central low pressure chamber 44 have the same pressure when filled with the insulating gas.
  • the central low-pressure chamber 44 and the closed-side low-pressure chamber 33 are filled with sulfur hexafluoride (SF 6 ) as an insulating gas.
  • sulfur hexafluoride SF 6
  • nitrogen (N 2 ), carbon dioxide (CO 2 ), or dry air (dry air) can also be used as the insulating gas filled in the central low-pressure chamber 44 and the closed-side low-pressure chamber 33. That is, the central low-pressure chamber 44 and the closed-side low-pressure chamber 33 may be filled with sulfur hexafluoride, nitrogen, carbon dioxide, or dry air as an insulating gas.
  • the central low pressure chamber 44 and the closed side low pressure chamber 33 may be filled with two or more kinds of mixed gases of sulfur hexafluoride, nitrogen, carbon dioxide, and dry air as insulating gases.
  • the closed-side low pressure chamber 33 and the central low pressure chamber 44 are filled with an insulating gas at a pressure in the range of atmospheric pressure (ie, 0.0 MPa) to 0.2 MPa.
  • the pressure difference between the vacuum chamber 15 and the central low-pressure chamber 44 is about 0.1 MPa to 0.3 MPa.
  • a force resulting from the pressure difference acts on the vacuum vessel 11 and the bellows 12 that partition the vacuum chamber 15 and the central low-pressure chamber 44.
  • the circuit breaker 1 is provided with a pressure measuring device for measuring the pressure of the insulating gas in the closed low pressure chamber 33 and the central low pressure chamber 44.
  • a pressure gauge 8 that measures the pressure in the low-pressure chambers 33 and 44 and displays the measured pressure is provided outside the pressure vessel 3.
  • the pressure gauge 8 is disposed outside the closed side end portion 3e in the moving direction of the pressure vessel 3, more specifically, at a position facing the closed side low pressure chamber 33 across the end portion 3e.
  • the central low pressure chamber 44 communicates with the closed low pressure chamber 33 via the internal communication hole 32. For this reason, the pressure is almost the same as that of the closed-side low pressure chamber 33. Therefore, the pressure gauge 8 also measures the pressure in the central low pressure chamber 44. Since the pressure gauge 8 is disposed outside the pressure vessel 3, the pressure of the insulating gas filled in the low pressure chambers 33 and 44 can be easily known from the outside of the circuit breaker 1.
  • a conductor (hereinafter referred to as a closed-side extended conductor) 24 extends from the closed-side end plate 22 to the closed side in the moving direction on the vertically upper side of the closed-side end plate 22.
  • a conductor 26 (hereinafter referred to as a closed-side central conductor) 26 that extends substantially linearly inside the bushing 71 via an insulating spacer 28 is coupled to the closed-side extended conductor 24.
  • the insulating spacer 28 insulates the closed side center conductor 26 from the pressure vessel 3 and hermetically separates the pressure vessel 3 from the bushing 71.
  • the closing side extension conductor 24 and the closing side center conductor 26 together with the closing side end plate 22 constitute a closing side conductor.
  • a conductor 64 extends from the open side end plate 62 to the open side in the moving direction.
  • a conductor (hereinafter referred to as an open-side center conductor) 66 extending in a substantially linear manner inside the bushing 72 is coupled to the open-side extended conductor 64 via an insulating spacer 68.
  • the insulating spacer 68 insulates the opening-side center conductor 66 from the pressure vessel 3 and hermetically separates the pressure vessel 3 and the bushing 72 from each other.
  • the open-side extending conductor 64 and the open-side center conductor 66 together with the open-side end plate 62 constitute an open-side conductor.
  • the insulating spacer 28 and the insulating spacer 68 may be omitted if it is not necessary to separate the pressure vessel 3 and the bushing 71 or the bushing 72 from each other in an airtight manner.
  • the closing side central conductor 26 is coupled to the closing side end plate 22 and the stationary contact 20 via the closing side extension conductor 24.
  • the open-side center conductor 66 is coupled to the open-side end plate 62 via the open-side extended conductor 64, and is electrically connected to the movable contact 50 via the operation rod 52.
  • the open side conductor of the open side conductor in the moving direction from the open side end plate 62 is in sliding contact with the closing portion 53 of the operating rod 52 in the moving direction from the insulating portion 55.
  • the energization contact part 63 protrudes from the opening side end plate 62 to the opening side in the moving direction, and has a substantially cylindrical shape.
  • the energizing contact portion 63 constitutes an open-side conductor and faces the high-pressure chamber 5.
  • the operation rod 52 of the present embodiment is provided with a portion (hereinafter referred to as a radial protrusion) 53 that protrudes radially outward from the insulating portion 55 on the closing side in the moving direction. It has been.
  • the radial protrusion 53 includes a member (hereinafter referred to as an energizing member) 54 that is in sliding contact with the above-described energizing contact portion 63 and allows current to flow between the open-side conductor and the movable contact 50.
  • the radial protrusion 53 is a conductor portion of the operation rod 52 that is electrically connected to the movable contact 50.
  • the radial protrusion 53 protrudes over the entire circumference of the operation rod 52.
  • a current-carrying member 54 is held on the outer peripheral side of the radial protrusion 53.
  • the energization member 54 has a substantially annular shape, is held by the radial protrusion 53, is in sliding contact with the inner wall of the energization contact portion 63, and allows a main current to flow.
  • the energizing member 54 is made of a material having relatively high conductivity. As the material constituting the energization member 54, for example, a metal material containing copper as a main component is used.
  • the energizing contact portion 63 has a substantially cylindrical shape coaxially with the operation rod 52 and the radial protrusion 53.
  • the energizing contact portion 63 is configured to surround the radially protruding portion 53 of the operating rod 52 and the radially outer side of the energizing member 54 at both the closed position (see FIG. 1) and the open position (see FIG. 3). .
  • the radial protrusion 53 of the operation rod 52 has a groove that accommodates at least a part of the energization member 54.
  • the energization member 54 is in sliding contact with the energization contact portion 63 of the open side end plate (open side conductor) 62 while being accommodated in the groove and held by the radial protrusion 53.
  • the movable contact 50 and the operating rod 52 are electrically connected to the open-side conductor, that is, the open-side end plate 62, the open-side extended conductor 64, and the open-side central conductor 66 regardless of the open position and the closed position.
  • the open-side conductor that is, the open-side end plate 62, the open-side extended conductor 64, and the open-side central conductor 66 regardless of the open position and the closed position.
  • a member (hereinafter referred to as a seal member) 61 for ensuring the airtightness of the above-described central low pressure chamber 44 is provided on the radially inner side of the open side end plate 62.
  • the seal member 61 has a substantially annular shape, and is in sliding contact with the portion 51 on the closing side in the movement direction from the radial protrusion 53 of the operation rod 52.
  • the seal member 61 is made of a material having relatively high lubricity such as PTFE.
  • the circuit breaker 1 of the present embodiment is disposed outside the operating rod 52 in the vacuum vessel 11 in the radial direction, as shown in FIG. 1, and surrounds the operating rod 52.
  • the bellows 12 expands and contracts in the moving direction according to the movement of the rod 52.
  • an interelectrode insulator 44 extends in the moving direction.
  • a central low pressure chamber 44 is formed on the inner side in the radial direction of the interelectrode insulator 40, and the vacuum vessel 11 and the bellows 12 are disposed in the central low pressure chamber 44.
  • the bellows 12 partitions the vacuum chamber 15 from the central low pressure chamber 44.
  • the insulating portion 55 made of an electrical insulator in the operation rod 52 faces the high pressure chamber 5 on the opening side in the moving direction from the opening side end plate 62.
  • the insulating cylinder 30 is coupled to the closing side end 3e in the moving direction of the pressure vessel 3, and the closing side low-pressure chamber 33 extends to the end 3e. That is, the closed side low pressure chamber 33 is defined by the insulating cylinder 30, the closed side end plate 22, and the end 3 e of the pressure vessel 3.
  • the vacuum vessel 11 and the bellows 12 are located inside the interpolar insulator 40 between the closed side end plate 22 and the open side end plate 62 in the pressure vessel 3. Since it is accommodated in the chamber 44, the pressure difference between the inner surface 12 a and the outer surface 12 b of the bellows 12 can be reduced as compared with the case where it is accommodated in the high-pressure chamber 5.
  • the insulating portion 55 of the operating rod 52 is accommodated in the high-pressure chamber 5 on the opening side in the moving direction from the opening-side end plate 62.
  • the distance in the moving direction of the insulating portion 55 and the distance in the moving direction between the open side end plate 62 and the end portion 3c of the pressure vessel 3 can be made relatively small. Thereby, the weight reduction of the insulation part 55 can be achieved and the high-speed operation
  • the insulating cylinder 30 is accommodated in the high-pressure chamber 5 on the closing side in the moving direction from the closing end plate 22.
  • the closed-side low-pressure chamber 33 communicating with the central low-pressure chamber 44 is formed, and the closed-side low-pressure chamber 33 extends to the end 3e on the closed side in the moving direction of the pressure vessel 3.
  • the dimension in the moving direction of the insulating cylinder 30, that is, the closed side end plate 22 and the insulating cylinder 30 are improved.
  • the distance in the moving direction from the end 3e of the pressure vessel 3 can be made relatively small.
  • the closed-side low-pressure chamber 33 communicating with the central low-pressure chamber 44 extends to the end 3e of the pressure vessel 3, so that a pressure measuring device (for example, it is easy to monitor the pressure in the low pressure chambers 33 and 44 by providing a pressure gauge 8) or the like.
  • the size in the moving direction of the pressure vessel 3 is made compact while suppressing a high pressure difference from occurring in the bellows 12 facing the vacuum chamber 15. be able to.
  • the open-side conductor is in sliding contact with the current-carrying member 54 of the radial protrusion 53 which is the part of the operating rod 52 on the closed side in the moving direction with respect to the insulating portion 55 and It has an energizing contact portion 63 that is in sliding contact with the member 54 and allows a main current to flow.
  • the pressure measuring device that measures the pressure in the central low pressure chamber 44 and the closed side low pressure chamber 33 is a pressure gauge 8 that displays the measured pressure in the vicinity of the end 3e of the pressure vessel 3.
  • the pressure measuring device according to the present invention is not limited to this mode.
  • the pressure measuring device only needs to be able to measure at least the pressure in the closed-side low-pressure chamber 33, and various types of devices can be used regardless of the presence or absence of the pressure display function and the installation position.
  • the central low-pressure chamber 44 and the closed-side low-pressure chamber 33 can be communicated with the outside of the pressure vessel 3 and filled by introducing outside air.
  • One example will be described below.
  • FIG. 4 is an enlarged cross-sectional view showing the peripheral configuration of the insulating cylinder in the circuit breaker of the present embodiment.
  • symbol is attached
  • the circuit breaker of the present embodiment has a communication hole (hereinafter referred to as an external) for introducing outside air into the closed-side low-pressure chamber 33 at the closed end 3 e in the moving direction of the pressure vessel 3. 35) (denoted as a communication hole).
  • the external communication hole 35 allows the closed side low pressure chamber 33 to communicate with the outside of the pressure vessel 3.
  • the external communication hole 35 extends in the movement direction (indicated by a dashed line A in the drawing).
  • the closed-side low-pressure chamber 33 communicates with the central low-pressure chamber 44 through the internal communication hole 32.
  • the external communication hole 35 is provided with a filter 37 that can separate at least one of dust and moisture from the outside air.
  • the filter 37 separates dust (foreign matter) and moisture (rain water) contained in the air flowing through the external communication hole 35.
  • the central low-pressure chamber 44 and the closed-side low-pressure chamber 33 are passed through the external communication hole 35 and the filter 37 provided in the closed-side end portion 3e in the moving direction of the pressure vessel 3 through the pressure. Outside air (air) outside the container 3 is introduced.
  • the pressures of the air introduced into the central low pressure chamber 44 and the closed side low pressure chamber 33 are both atmospheric pressure.
  • the present embodiment it is not necessary to monitor the pressures in the central low pressure chamber 44 and the closed low pressure chamber 33 with a pressure measuring device such as the pressure gauge 8 (see FIG. 1) described above. Even if the insulating gas filled in the high-pressure chamber 5 flows into the central low-pressure chamber 44 or the closed-side low-pressure chamber 33, the flowing insulating gas flows from the external communication hole 35 to the outside of the pressure vessel 3. Therefore, the pressure in the low pressure chambers 33 and 44 does not increase as in the high pressure chamber 5, and the bellows 12 that partitions the central low pressure chamber 44 and the vacuum chamber 15 does not break. .
  • FIG. 5 is a sectional elevation view showing the configuration of the circuit breaker of the present embodiment.
  • FIG. 5 shows a state where the movable contact and the operation rod are located at a closed position.
  • hatching is omitted for the pressure vessel, the operation mechanism, and the like for easy understanding.
  • symbol is attached
  • the closed side central conductor (closed side conductor) 27 extending inside the bushing 71 via the insulating spacer 28 has the outside air closed to the closed side low pressure chamber 33.
  • An introduction passage (hereinafter simply referred to as “in-conductor passage”) 29 is formed inside.
  • the in-conductor passage 29 extends in the longitudinal direction in the closed side central conductor 27.
  • a passage 29 c for introducing outside air into the closed-side low-pressure chamber 33 is formed in the closed-side extended conductor (closed-side conductor) 24 and the insulating cylinder 30.
  • the passage 29 c extends in the radial direction of the insulating cylinder 30.
  • the passage 29c has a radially outer side connected to the in-conductor passage 29 and a radially inner side connected to the closed-side low pressure chamber 33.
  • the outside of the pressure vessel 3 and the closed-side low-pressure chamber 33 communicate with each other via an in-conductor passage 29 and a passage 29c.
  • the closed-side low-pressure chamber 33 communicates with the central low-pressure chamber 44 through the internal communication hole 32.
  • a filter 70 capable of removing at least one of dust and moisture is provided at the outer end of the pressure vessel 3 in the conductor passage 29.
  • the filter 70 separates dust (foreign matter) and moisture (rainwater) contained in the air flowing through the in-conductor passage 29.
  • the outside air (air) outside the pressure vessel 3 is passed through the central low pressure chamber 44 and the closed low pressure chamber 33 through the conductor inner passage 29 and the filter 70 in the closed central conductor 27. ) Is introduced.
  • the pressures in the central low pressure chamber 44 and the closed side low pressure chamber 33 are both atmospheric pressure. Also in this embodiment, it is not necessary to monitor the pressure in the central low-pressure chamber 44 and the closed-side low-pressure chamber 33 by the pressure measuring device.
  • the in-conductor passage 29 for introducing the outside air outside the pressure vessel 3 into the closed-side low pressure chamber 33 is formed in the closed-side central conductor 27.
  • Such an in-conductor passage is not limited to this mode.
  • an in-conductor passage may be formed in the open-side center conductor 66, and outside air outside the pressure vessel 3 may be introduced into the central low-pressure chamber 44 through the in-conductor passage.
  • outside air air
  • the central low-pressure chamber 44 in which the vacuum vessel 11 and the bellows 12 are disposed, and the closed-side low-pressure chamber 33 on the closed side in the moving direction are closed end plates (closed side conductors).
  • the aspect of the central low-pressure chamber and the closed-side low-pressure chamber according to the present invention is not limited to this aspect.
  • the central low-pressure chamber and the closed-side low-pressure chamber need only be introduced with an insulating gas or air having a lower pressure than that of the high-pressure chamber.
  • the central low pressure chamber and the closed side low pressure chamber may be filled with different types of insulating gases at different pressures.
  • the open position described above is a position where the movable contact and the operating rod are separated as far as possible from the fixed contact on the open side in the moving direction, that is, a so-called “fully open position”. It is also suitable.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Gas-Insulated Switchgears (AREA)
  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)

Abstract

L'invention concerne un interrupteur (1) qui, dans ce mode de réalisation, comprend un soufflet (12) qui est disposé sur le côté externe dans la direction radiale d'une tige d'actionnement (52) à l'intérieur d'un récipient sous vide (11), le soufflet (12) se déployant et se contractant dans une direction de déplacement qui est fonction du mouvement de la tige d'actionnement (52). Une chambre centrale basse pression (44) est formée sur le côté interne dans la direction radiale d'un isolateur inter-électrode (40) qui s'étend dans la direction de mouvement d'une unité de contact mobile (50) entre une plaque d'extrémité côté ouvert (62) et une plaque d'extrémité côté fermé (22). Le soufflet (12) coupe une chambre à vide (15) de la chambre centrale basse pression (44). Faite d'un isolant électrique, la section d'isolation (55) de la tige d'actionnement (52) fait face à une chambre haute pression (5) sur le côté ouvert dans la direction de mouvement par rapport à la plaque d'extrémité côté ouvert (62). Un tube d'isolation (30) est joint à la section d'extrémité (3e) sur le côté fermé dans la direction de mouvement par rapport au conteneur sous pression (3) ; et une chambre à basse pression côté fermé (33) s'étend vers la section d'extrémité (3e).
PCT/JP2016/003234 2015-07-10 2016-07-07 Interrupteur pour système de puissance WO2017010066A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015-139058 2015-07-10
JP2015139058A JP2017022002A (ja) 2015-07-10 2015-07-10 遮断器

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WO2017010066A1 true WO2017010066A1 (fr) 2017-01-19

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PCT/JP2016/003234 WO2017010066A1 (fr) 2015-07-10 2016-07-07 Interrupteur pour système de puissance

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WO (1) WO2017010066A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017060244A (ja) * 2015-09-15 2017-03-23 株式会社明電舎 ガス絶縁開閉装置
US11935713B2 (en) * 2020-01-10 2024-03-19 Mitsubishi Electric Corporation Vacuum circuit breaker

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57185628A (en) * 1981-05-08 1982-11-15 Tokyo Shibaura Electric Co Hybrid breaker
JPS58144508A (ja) * 1982-02-22 1983-08-27 株式会社東芝 直流しや断器
JPS60141038U (ja) * 1984-02-29 1985-09-18 株式会社日立製作所 真空開閉装置
JPH06208820A (ja) * 1993-01-12 1994-07-26 Hitachi Ltd ガス絶縁真空遮断器
WO2010134442A1 (fr) * 2009-05-18 2010-11-25 株式会社日本Ａｅパワーシステムズ Disjoncteur à vide isolé par gaz
JP2013055738A (ja) * 2011-09-01 2013-03-21 Hitachi Ltd 開閉装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57185628A (en) * 1981-05-08 1982-11-15 Tokyo Shibaura Electric Co Hybrid breaker
JPS58144508A (ja) * 1982-02-22 1983-08-27 株式会社東芝 直流しや断器
JPS60141038U (ja) * 1984-02-29 1985-09-18 株式会社日立製作所 真空開閉装置
JPH06208820A (ja) * 1993-01-12 1994-07-26 Hitachi Ltd ガス絶縁真空遮断器
WO2010134442A1 (fr) * 2009-05-18 2010-11-25 株式会社日本Ａｅパワーシステムズ Disjoncteur à vide isolé par gaz
JP2013055738A (ja) * 2011-09-01 2013-03-21 Hitachi Ltd 開閉装置

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