JP2011171315A - Vacuum switchgear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum switchgear capable of improving manufacturing efficiency without complicating a shape of a vacuum container and reducing manufacturing cost. <P>SOLUTION: The vacuum switchgear includes: a main circuit electrode having a movable electrode opposite to a fixed electrode and arranged at a part of a main circuit and performing at least current conduction and interception of the main circuit; cylindrical vacuum containers, wherein the inside is vacuum, arranged for each main circuit of each phase and having the fixed electrode and the movable electrode in the inside; a switch having a movable electrode for grounding opposite to a fixed electrode for grounding and electrically connected with the main circuit; a molding member for integrally molding the vacuum container and the switch; a first controller for driving the movable electrode in the vacuum container; an air insulating rod for transmitting operation force from the first controller to the movable electrode; a second controller for driving the movable electrode for grounding; and an air insulating section located further toward a first and second controllers side than the vacuum container and surrounded by the molding member and enclosing insulating gas. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vacuum switch gear, and more particularly to an opening / closing portion thereof.

  The vacuum switchgear is a switchgear that is miniaturized by focusing on the vacuum pressure region having high insulation characteristics, keeping the opening / closing part in the vacuum pressure region, and shortening the insulation distance. As a conventional vacuum switch gear, for example, there is one described in Patent Document 1.

  In Patent Document 1, two main contacts that realize three positions of energization, interruption, and disconnection, a main circuit conductor that connects the two main contacts, and an operator of the main circuit conductor and the main circuit are electrically connected. The main circuit vacuum switching unit is housed in a single vacuum vessel with an insulating rod that is connected in an insulated state, and is electrically connected to the main circuit, and is configured in a vacuum vessel separate from the main circuit vacuum switching unit. There is described a vacuum switchgear having a ground vacuum opening / closing part for grounding a main circuit, and an opening / closing part obtained by integrally molding the main circuit vacuum opening / closing part and the ground vacuum opening / closing part.

JP 2007-14086 A

  However, the structure described in the above-mentioned Patent Document 1 has main contacts that realize three positions of energization, interruption, and disconnection in one vacuum vessel. There was a problem that the reliability of the apparatus could not be secured.

  Further, the two main contacts, the main circuit conductor connecting the two main contacts, and the insulating rod are housed in one vacuum vessel, and the shape of the vacuum vessel is complicated. If the shape of the vacuum vessel becomes complicated, the cost for processing into a complicated shape will increase, and the number of pieces that can be accommodated in the vacuum furnace will also be limited, making it unsuitable for mass production and also increasing the cost. There was a problem to do.

  The present invention has been made in view of the above problems, and provides a vacuum switchgear that can improve the production efficiency without complicating the shape of the vacuum vessel and can reduce the production cost. Objective.

  A vacuum switchgear that solves the problem of the present invention has a fixed electrode, a movable electrode facing the fixed electrode, and is provided in a part of the main circuit, and a main circuit electrode that at least energizes and cuts off the main circuit Cylindrical vacuum container provided for each main circuit of each phase and having a vacuum inside and having the fixed electrode and the movable electrode therein, a grounding fixed electrode, and a grounding movable electrode opposed to the grounding fixed electrode A switch having electrodes and electrically connected to the main circuit, a cable connected to the load side from the switch, a mold member for integrally molding the vacuum container and the switch, and the vacuum container A first operation device for driving the movable electrode, an air insulating rod for transmitting an operation force from the first operation device to the movable electrode, and a second operation for driving the grounding movable electrode. And the first and the second from the vacuum vessel And an air insulation portion surrounded by the mold member and filled with an insulating gas, and the air insulation rod is located in the air insulation portion, and has a potential of the main circuit. It is characterized by sharing the ground potential.

  According to the vacuum switchgear according to the present invention, the manufacturing efficiency can be improved and the manufacturing cost can be reduced without complicating the shape of the vacuum vessel.

It is front sectional drawing of the vacuum switch of Example 1 of this invention. It is the figure which expanded and displayed the transition conductor of FIG. It is front sectional drawing of the vacuum switch of Example 2 of this invention. It is front sectional drawing of the vacuum switch of Example 3 of this invention. It is front sectional drawing of the vacuum switch gear which mounts the vacuum switch of Example 1 of this invention. It is front sectional drawing of the vacuum switch gear which mounts the vacuum switch of Example 2 of this invention. It is front sectional drawing of the vacuum switch gear which mounts the vacuum switch of Example 3 of this invention. It is front sectional drawing of the vacuum switch gear which mounts the vacuum switch of Example 4 of this invention. It is the figure which expanded and displayed the partial cross section for demonstrating the electromagnetic force which acts on a movable conductor and a transition conductor.

  A vacuum switchgear that improves the reliability against vacuum leakage and reduces the operating force of the operating device has been realized.

  A first embodiment of the present invention will be described with reference to FIGS. 1, 2, and 5.

  In FIG. 1, the cross section of only one phase is displayed among three phases. The remaining two phases have the same configuration as described below. The vacuum switch 100 is generally composed of two cutoff / disconnection parts 51A and 51B having a symmetrical shape, a ground opening / closing part 52, and a mold part 22 in which these are integrally molded.

  The blocking / disconnecting portions 51A and 51B will be described. The blocking / disconnecting parts 51A and 51B are made of upper ceramic insulating cylinders 6A and 6B and lower ceramic insulating cylinders 8A and 8B, the upper ends of which are made of metal upper seal rings 15A and 15B, and the lower ends of which are made of metal. The fixed electrodes 9A and 9B and the movable electrodes 5A and 5B opposed to the inside of the vacuum vessels 1A and 1B having the same shape and the same cylindrical shape that keep the inside at a vacuum pressure by closing with the side seal rings 10A and 10B are included. is doing. The fixed electrodes 9A and 9B are fixed to one end of the fixed conductors 18A and 18B passing through the lower seal rings 10A and 10B of the vacuum containers 1A and 1B, and the movable electrodes 5A and 5B are fixed to the vacuum containers 1A and 1B. Among them, it is fixed to one end of the movable conductors 17A and 17B penetrating the upper seal rings 15A and 15B (the movable electrodes 5A and 5B and the movable conductors 17A and 17B are collectively referred to as the movable electrode side). The periphery of the fixed electrodes 9A and 9B and the movable electrodes 5A and 5B is covered with arc shields 7A and 7B sandwiched between the upper ceramic insulating cylinders 6A and 6B and the lower ceramic insulating cylinders 8A and 8B. Since the movable conductors 17A and 17B are operated by an operating device to be described later, the movable conductors 17A and 17B include the vacuum container 1A so that the vacuum state in the vacuum containers 1A and 1B can be maintained even when the movable conductors 17A and 17B are operated. Bellows 2A and 2B fixed to 1B are fixed. Two coil springs 61 and 62 connected to the connecting portion between the ceramic insulating cylinder and the seal ring are disposed so as to cover the stepped portions of the ceramic insulating cylinder and the seal ring and the corners of the ceramic insulating cylinder.

  The fixed conductor 18A is connected to the bushing conductor 12A at the lower part of the vacuum vessel 1A, and the movable conductors 17A and 17B are electrically connected through the crossing conductor 25. As shown in FIG. 2, the transition conductor 25 is fixed to the mold portion 22 with a bolt 27, and the contact portion between the transition conductor 25 and the movable conductors 17 </ b> A and 17 </ b> B is operated by the operation device with the movable conductors 17 </ b> A and 17 </ b> B. The spring contact 41 is arranged so as to function as a sliding contact. The end of the fixed conductor 18B opposite to the side where the fixed electrode 9B is fixed is connected to the bushing conductor 12B.

Of the movable conductors 17A and 17B, the end opposite to the side where the movable electrodes 5A and 5B are fixed is connected to a cross operation rod 26 connected to an operation mechanism (first operation device) 53. The crossover operating rod 26 is connected to the air-insulating operating rod 14 at the center in the longitudinal direction, and the air-insulating operating rod 14 is connected to the operating rod 16. Above the vacuum containers 1A and 1B, a space surrounded by a mold part 22 and a mold lid 23, which will be described later, is filled with SF ₆ gas, dry air, nitrogen gas, and the like. Therefore, the air insulation operating rod 14 is configured to ensure an insulation distance in the gas.

  The ground opening / closing part 52 will be described. The ground opening / closing part 52 includes a ceramic cylinder composed of an upper ceramic cylinder 33 and a lower ceramic cylinder 35, a lower seal ring 36 that hermetically seals a lower side of the lower ceramic cylinder 35, and an upper ceramic cylinder 33. An upper seal ring 38 that hermetically seals the upper side of the electrode, and a fixed electrode 37 and a movable electrode 31 disposed to face the fixed electrode 37 inside a grounding vacuum vessel having a vacuum pressure inside. The fixed electrode 37 is fixed to one end of a fixed conductor 43 that penetrates the lower ceramic cylinder of the grounding vacuum vessel, and the movable electrode 31 is movable that penetrates the upper ceramic cylinder of the grounding vacuum vessel. It is fixed to one end of the conductor 42. The other end of the fixed conductor 43 is connected to the bushing conductor 12B and has the same potential as the main circuit. On the other hand, the other end of the movable conductor 42 is connected to an operation mechanism (second operation device) 54 via an insulating member. Between the grounding vacuum container and the movable conductor 42, the operation of the movable conductor 42 can be performed by the operation mechanism 54, and the inside of the grounding vacuum container can be kept in a vacuum even when the movable conductor 42 is operated by the operation mechanism 54. The bellows 32 fixed to the grounding vacuum vessel is arranged so that the

  The above-described blocking / disconnecting parts 51A and 51B, the ground opening / closing part 52, and the bushing conductors 12A and 12B are molded by the molding part 22 made of a solid insulating resin such as epoxy. The bushing conductors 12A and 12B form the bushings 11A and 11B together with the mold part 22 covering the periphery thereof. The mold part 22 has a structure that covers the vacuum containers 1A and 1B and the grounding vacuum container in the whole axial direction, and further covers the vacuum containers 1A and 1B to the upper side in the axial direction. The mold part 22 is overlaid with the mold lid 23 in close contact with each other, and the mold part 22 and the mold lid 23 are sealed with a seal 24 so as to maintain hermeticity. The mold lid 23 has a protrusion on the inner peripheral surface of the mold part 22 so as not to be detached from the mold part 22. The outer surfaces of the mold part 22 and the mold lid 23 are covered with a ground layer.

  The mold lid 23 is arranged so as to cover the periphery of the operation rod 16. The mold lid 23 and the operation rod 16 are sealed with a seal 24 so that the mold lid 23 can be operated in the axial direction while maintaining hermeticity. Further, the operation rod 16 is mechanically connected to the operation mechanism 53 and is driven in the vertical direction.

  Next, the overall configuration of the board will be described. The tip of the bushing 11A formed by molding the bushing conductor 12A with the molding part 22 protrudes into the cable chamber 66 below the switch chamber 65 in which the vacuum switch 100 is housed, and is solid-insulated here. Connected to the bus.

  The bushing 11 </ b> B formed by the bushing conductor 12 </ b> B and the mold portion 22 covering the periphery thereof is connected to the load cable 63 in the cable chamber 66. A current transformer 64 is arranged in the middle of the load cable 61 at the bottom of the panel.

  Above the switch room 65 is an instrument room 67 in which a protection relay, VT, and the like are stored.

  The operation at the time of opening / closing / disconnecting will be described. When the movable electrodes 5A and 5B are in contact with the fixed electrodes 9A and 9B, the main circuit is in a closed state. When the operation mechanism 53 is operated from this state, the movable electrodes 5A and 5B fixed to the movable conductors 17A and 17B are moved upward via the operation rod 16, and the current is interrupted. At this time, the transition conductor 25 remains fixed by the bolt 27. However, the presence of the spring contact 41 acting as a sliding contact makes it possible for the movable conductors 17A and 17B to operate even when the transition conductor 25 remains fixed. In addition, it is possible to keep energization even when the movable conductors 17A and 17B are operated. Similarly, in the case of the disconnection operation, by operating the operation mechanism 53, the movable electrodes 5A and 5B fixed to the movable conductors 17A and 17B move upward and move to the disconnection position. Here again, the presence of the spring contact 41 serving as a sliding contact allows the movable conductors 17A and 17B to operate even when the transition conductor 25 remains fixed.

  Next, an electromagnetic repulsion force caused by a current flowing through each conductor of the main circuit will be described with reference to FIG. When the current is applied, current from the busbar flows through the movable conductors 17A and 17B and the transition conductor 25. Due to this current, a magnetic field is generated around the movable conductors 17A and 17B and the transition conductor 25, and an electromagnetic repulsive force indicated by an arrow in FIG. 9 is applied to the movable conductors 17A and 17B and the transition conductor 25 from these magnetic fields. It will be.

  In the present embodiment, the fixed electrodes 9A and 9B and the movable electrodes 5A and 5B that realize energization / cutoff / disconnection are stored separately in the two vacuum containers 1A and 1B. Even in this case, the other vacuum vessel can perform the blocking and disconnecting functions, and the reliability of the apparatus can be improved. Further, in this embodiment, since each of the vacuum containers 1A and 1B has a cylindrical shape, the structure is not complicated and the manufacture becomes easy. Furthermore, since the vacuum containers 1A and 1B have a cylindrical shape, the space factor can be increased in a vacuum furnace having a constant volume, and many vacuum containers can be manufactured at a time.

  In this embodiment, since the vacuum containers 1A and 1B have the same shape, it is not necessary to make a plurality of molds, and the manufacturing cost can be reduced.

  In this embodiment, since the seal between the mold lid 23 and the operation rod 16 is sealed with the seal 24, the operation rod 16 can be operated while maintaining an airtight state. it can.

  Further, in this embodiment, a coil spring connected in two is arranged at the connecting portion between the ceramic insulating cylinder and the seal ring so as to cover the step portion of the ceramic insulating cylinder and the seal ring and the corner of the ceramic insulating cylinder. Therefore, the electric field concentration in the connection portion with the seal ring in the ceramic insulating cylinder can be reduced.

  Further, in this embodiment, the transition conductor 25 serving as a system voltage is fixed with a bolt 27. When energized, a strong electromagnetic repulsive force acts on the transition conductor 25 in a direction away from the main circuit. However, since the transition conductor 25 is fixed with a bolt 27, the transition conductor 25 does not move even if the electromagnetic repulsion force acts. ing. As a result, it is no longer necessary to bear the electromagnetic repulsion force in the direction away from the main circuit acting on the crossover conductor 25 in order to maintain the closed state, and the holding force required for the operation mechanism 53 can be significantly reduced. it can. Since the holding force required for the operation mechanism 53 is significantly reduced, the operation mechanism 53 can be remarkably reduced in size.

  In addition, since the operating force necessary for maintaining the closing operation and the energized state is reduced, the electromagnet used for these operations can be miniaturized. If the electromagnet is miniaturized, the movable weight is reduced, and the energy required for the operation mechanism 53 is reduced not only when the electromagnet is turned on but also when it is shut off. As a result, the operation mechanism 53 can be further downsized.

  Furthermore, since the spring contact 41 acting as a sliding contact is arranged at the contact portion between the movable conductors 17A and 17B and the transition conductor 25, the movable conductors 17A and 17B can move even when the transition conductor 25 is fixed. , Energization / cutoff / disconnection can be realized. In this embodiment, the crossing conductor 25 is fixed by the bolt 27 while simplifying the structure. However, the crossing conductor 25 can be fixed even if an electromagnetic force is applied as long as the crossing conductor 25 can be fixed without using a bolt. Does not move, and the force required to operate the operation mechanism 53 can be reduced.

  In the present embodiment, the movable electrode side is a combination of the movable electrodes 5A and 5B and the movable conductors 17A and 17B.

  Next, a second embodiment of the present invention will be described with reference to FIGS. In Example 1, the aerial part surrounded by the mold part 22 was sealed with the mold lid 23 and the seal 24, but in this example, instead of these, the tip part of one end of the conductive rubber diaphragm 48 is used. Sealing is performed by placing the tip of the other end of the mold portion 22 in close contact with the upper end of the mold portion 22 and placing the tip of the other end in close contact with part of the operating rod 16. Since other parts are the same as those in the first embodiment, description thereof is omitted here.

  Since the rubber diaphragm 48 has flexibility, it can follow the movement of the operation rod 16 while maintaining an airtight state. Further, since the rubber diaphragm 48 is electrically conductive and is in close contact with the mold portion 22 that is at the ground potential, the rubber diaphragm 48 is also at the ground potential, thereby ensuring the safety of the operator.

  A third embodiment of the present invention will be described with reference to FIGS. In the second embodiment, the portion surrounded by the mold portion 22 in the first embodiment is sealed by the rubber diaphragm 48 in the present embodiment. Instead of the rubber diaphragm 48, a conductive rubber bellows 50 is used. That is, the tip part of one end of the rubber bellows 50 is disposed so as to be in close contact from the outer periphery of the tip part of the mold part 22 to the upper end part of the mold part 22 and the tip part of the other end is in close contact with a part of the operation rod 16. By doing so, the air is sealed. As in the second embodiment, the other parts are the same as those in the first embodiment, and thus detailed description thereof is omitted here.

  Since the rubber bellows 50 has flexibility, it is possible to follow the movement of the operation rod 16 while maintaining an airtight state. Further, since the rubber bellows 50 is electrically conductive and is in close contact with the mold portion 22 that is at the ground potential, the rubber bellows 50 is also at the ground potential, thereby ensuring the safety of the operator.

  A fourth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment, the vacuum switch 100 and the operation mechanisms 53 and 54 in the first embodiment are vertically inverted. By comprising in this way, workability | operativity at the time of connecting the adjacent switchboards electrically with the solid insulated bus 60 can be improved significantly.

  FIG. 8 shows only the vacuum switch 100 in the first embodiment, but it is of course possible to apply the vacuum switch described in the second and third embodiments.

  In each of the above-described embodiments, the configuration in which the phase is covered with the mold unit 22 for each phase has been described. However, a configuration in which three phases are molded together may be employed. When molding three-phase collectively, the degree of freedom increases in the arrangement of the three phases, and the size can be reduced.

  1A, 1B ... Vacuum container, 2A, 2B, 32 ... Bellows, 5A, 5B, 31 ... Movable electrode, 6A, 6B ... Upper ceramic insulation tube, 7A, 7B ... Arc shield, 8A, 8B ... Lower ceramic insulation tube, 9A, 9B, 37 ... fixed electrode, 10A, 10B, 36 ... lower seal ring, 11A, 11B ... bushing, 12A, 12B ... bushing conductor, 14 ... air-insulating operating rod, 15A, 15B, 38 ... upper seal ring , 16 ... Operation rod, 17A, 17B, 42 ... Movable conductor, 18A, 18B, 43 ... Fixed conductor, 22 ... Mold part, 23 ... Mold lid, 24 ... Seal, 25 ... Transition conductor, 26 ... Transition operation rod, 27 ... Bolt, 33 ... Upper ceramic cylinder, 35 ... Lower ceramic cylinder, 41 ... Spring contact, 48 ... Rubber diaphragm, 50 ... Rubber bellows, DESCRIPTION OF SYMBOLS 1A, 51B ... Breaking / disconnection part, 52 ... Grounding switching part, 53, 54 ... Operation mechanism, 60 ... Solid insulated bus, 61, 62 ... Coil spring, 63 ... Load cable, 64 ... Current transformer, 65 ... Switch room , 66 ... cable room, 67 ... instrument room, 100 ... vacuum switch.

Claims (7)

A fixed electrode, a movable electrode opposed to the fixed electrode, provided in a part of the main circuit, provided at least for the main circuit electrode for energizing / cutting off the main circuit, and for each main circuit of each phase; Has a cylindrical vacuum container having a fixed electrode and a movable electrode therein, a fixed electrode for grounding, and a movable electrode for grounding opposed to the fixed electrode for grounding, and electrically connected to the main circuit A switch to be connected; a cable connected to the load side from the switch; a mold member for integrally molding the vacuum container and the switch; and a first operation for driving the movable electrode in the vacuum container. An air insulating rod that transmits the operating force from the first operating device to the movable electrode, a second operating device that drives the movable electrode for grounding, and the first and the second from the vacuum vessel. 2 is located on the operating unit side and is surrounded by the mold member Is an air-insulated section insulating gas is enclosed,
The vacuum switchgear is characterized in that the air insulating rod is located in the air insulating portion and shares the potential of the main circuit with the ground potential. The vacuum switchgear according to claim 1,
A vacuum switchgear comprising a bushing conductor connected to the main circuit, the bushing conductor being covered with the mold member and connected to a load cable. The vacuum switchgear according to claim 1 or 2,
The vacuum switchgear characterized in that the main circuit is connected to a solid insulation bus and can be connected to an adjacent panel by the solid insulation bus. The vacuum switchgear according to any one of claims 1 to 3,
The vacuum switchgear characterized in that the mold member covers the vacuum vessel and the grounding switch in the axial direction and covers the axial operation unit side of the vacuum vessel. The vacuum switchgear according to any one of claims 1 to 4,
The vacuum switchgear, wherein the switch is a ground switch. The vacuum switchgear according to any one of claims 1 to 5,
The vacuum switchgear, wherein the insulating gas is any one of SF ₆ gas, dry air, and nitrogen gas. The vacuum switchgear according to any one of claims 1 to 6,
A vacuum switchgear characterized in that the air insulating part in which the insulating gas is sealed is sealed.

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