JP2012239246A - Mold switch and device with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a cooling performance.SOLUTION: A mold switch assembly comprises a stationary electrode, a movable electrode that can be approached to or separated from the stationary electrode, a stationary conductor connected to the stationary electrode, and a movable conductor connected to the movable electrode. Power is received from a bus side, and is supplied to a load side. The movable electrode is approached to or separated from the stationary electrode, so that three single-phase mold switches for inputting and blocking a current are assembled. The mold switch of each phase includes a region, in which an outer periphery of the mold switch is coated with a ground metal plate, and a region, in which the outer periphery is coated with a solid insulator. Among at least three phase mold switches, for the mold switch whose both ends are coated with the other phase mold switches, gas can flow around the region, in which the outer periphery is coated with the solid insulator.

Description

  The present invention relates to a mold switch and a device equipped with the same.

  A switch is a device arranged in a power transmission / distribution system, and cuts off an accident current, switches circuits, and the like. In recent years, solid insulation having better insulation characteristics than air insulation has been increasingly applied in response to the need for installation in places where installation space is limited. When solid insulation is applied, the insulation characteristics are improved, but it is desired to improve the cooling performance because of high airtightness.

  Here, as a conventional switch, there is one described in Patent Document 1, for example. FIG. 19 and FIG. 20 of the patent document describe a state in which cooling fins are provided around the switch gear on which the resin layer is disposed.

JP 2001-160342 A

  However, in the structure described in the above-mentioned Patent Document 1, only a single phase is described (FIG. 19 in the document), or when a plurality of phases are aggregated (FIG. 20 in the document), the switch of each phase Only the case where the heat pipe is arranged between the gears is described, and in this case, although heat can be homogenized, the heat pipe portion does not radiate heat, and the heat radiating is performed on the surface of the heat pipe. However, there is room for improvement in the cooling performance with respect to heat accumulation between phases, such as not directly cooling the switchgear of each phase. As an example, when the switchgears are arranged in a line as shown in FIG. 20 in the document, it is unavoidable that a temperature distribution in which the temperature of the central portion increases in the direction of the lined up. It is hoped that

  Therefore, an object of the present invention is to improve the cooling performance.

  In order to solve the above problems, a mold switch assembly according to the present invention is connected to a fixed electrode, a movable electrode that can be contacted with and separated from the fixed electrode, a fixed conductor connected to the fixed electrode, and the movable electrode. A single-phase power supply / cut-off by receiving power from the bus side and supplying power to the load side, while the movable electrode contacts and separates from the fixed electrode. A mold switch assembly in which mold switches are combined in three phases, and the mold switch of each phase includes a region where the outer periphery of the mold switch is covered with a ground metal plate and a region covered with a solid insulator. As for a mold switch in which both ends are covered with mold switches of other phases among at least three-phase mold switches, gas can flow around the area covered with the solid insulator. The features.

  According to the present invention, it is possible to improve the cooling performance.

It is a sectional side view which shows the mode of the mold switch which concerns on Example 1. FIG. It is a rear view which shows the mode of the mold switch assembly which concerns on Example 1. FIG. It is a front view which shows the mode of the mold switch assembly which concerns on Example 1. FIG. 3 is a top view showing a state of a one-phase mold switch according to Embodiment 1. FIG. It is a sectional side view which shows the mode of the mold switch which concerns on Example 2. FIG. It is a sectional side view of the switch unit which mounts the mold switch aggregate concerning Example 1. It is a sectional side view of the switchgear which further mounted the switch unit concerning Example 3. FIG.

  Hereinafter, preferred embodiments for carrying out the present invention will be described. The following are merely examples of implementation, and are not intended to be construed as limiting the content of the invention to the examples. It goes without saying that the invention can be variously modified as long as it satisfies the contents defined based on the claims.

  This embodiment will be described with reference to FIGS.

  As shown in FIG. 1, a mold switch for each phase according to this embodiment includes a grounded metal case (grounded metal plate) 1 and a solid insulator 2 (resin such as epoxy) connected to the metal case 1. ), A vacuum valve 3 integrally cast with the solid insulator 2, a ground disconnecting portion 4, a bus bushing 5 and a cable bushing 6, and is enclosed in a metal housing 34. ing. The metal housing 34 also serves as a ground metal plate for a switch unit described later in this specification. In FIG. 1, only one phase will be described for explaining a side sectional view, but when actually used, it is used in combination with three phases as shown in FIG. Since the other two phases have the same configuration except for the bushing arrangement position, detailed description will be omitted.

  The vacuum valve 3 includes a fixed side electrode 12, a movable side in a vacuum vessel 11 configured by connecting a fixed side ceramic insulating cylinder 7, a movable side ceramic insulating cylinder 8, a fixed side end plate 9 and a movable side end plate 10. Arc for protecting side electrode 13, fixed side conductor 14 connected to fixed side electrode 12, movable side conductor 15 connected to movable side electrode 13, and ceramic insulating cylinders 7 and 8 from arcs when the electrodes are opened and closed A shield 16 is provided. The fixed-side conductor 14 is connected to the cable bushing center conductor 17 so that power can be distributed to the load side. The cable bushing center conductor 17 is arranged in a direction orthogonal to the fixed-side conductor 14, and the conductor is concentrated at the portion sandwiched between the cable bushing center conductor 17 and the fixed-side conductor 14, and heat tends to rise during use. . Further, a bellows 18 for realizing the movement of the movable conductor 15 is arranged on the movable side while maintaining the vacuum state in the vacuum valve 3. The vacuum valve 3 is turned on and off by allowing the movable side electrode 13 and the movable side conductor 15 to move in the axial direction while maintaining the internal vacuum by the bellows 18 connected to the movable side end plate 10 and the movable side conductor 15. The state is switched. The movable conductor 15 is connected to an operating rod 19 for the vacuum valve 3 that is air-insulated and solid-insulated, and the vacuum valve operating rod 19 is connected to an operating device (not shown).

  The ground disconnection portion 4 is connected to the bus bushing central conductor 20, a bushing fixed electrode 21 connected to the bus side via the center conductor, and a ground side fixed electrode 22 (guide) having a ground potential. The intermediate fixed electrode 23 is provided in the middle in the axial direction and is electrically connected to the movable conductor 15 on the vacuum valve 3 side via the flexible conductor 24, and the inside thereof is insulated in the air. Each of these fixed electrodes has a uniform inner diameter and is arranged in a straight line. With respect to each of these fixed electrodes, the ground disconnection portion movable conductor 25 moves in the ground disconnection portion 4 in a straight line, so that it can be switched to three positions of closed, disconnection, and ground. The ground disconnection section movable conductor 25 is connected to an operation rod 26 that is air-insulated and solid-insulated, and can be moved by an operation mechanism (not shown). In the ground disconnection section movable conductor 25, the portion that contacts each of the fixed contacts is constituted by the spring contact 27, so that the ground disconnection section movable conductor 25 is prevented from moving and is reliably contacted by an elastic force. I am trying to do it.

  The bus bushing 5 is configured by covering the periphery of the bus bushing center conductor 20 with the solid insulator 2, and the cable bushing 6 is configured by covering the periphery of the cable bushing center conductor 17 with the solid insulator 2. Has been.

  As a material for the vacuum rod operating rod 19, the ground disconnecting portion operating rod 26, and the solid insulator 2, an epoxy resin is used in consideration of insulation characteristics and mechanical strength and good moldability. . Further, the operation rods 19 and 26 and the solid insulator 2 are each insulated by the surrounding gas as well as solid insulation by itself.

  The air ground disconnection portion 4 and the vacuum valve 3 are integrally cast by a solid insulator 2.

  The connection part 31 between the metal case 1 and the solid insulator 2 is hermetically connected by packing or the like, and no gas (including water vapor) enters the sealed space in which the operation rods 19 and 26 are disposed from the connection part 31. It is like. Thereby, inflow of dust can be prevented and an increase in humidity can also be suppressed.

  Further, the operating rod 19 is slidably connected to the metal case 1, and the two are sealed by an O-ring to keep airtight. Therefore, no gas or moisture enters or exits from the sliding portion. The operating rod 26 is formed so as to be in sliding contact with the ground-side fixed electrode 22 so that no gas or moisture enters or exits from the sliding portion.

  As shown in FIG. 2, the mold switch for each phase is covered with a ground metal plate 32 for each phase. The solid insulator 2 of each phase of the mold switch is provided with a radiation fin 30, and a space is provided around the radiation fin 30 in the ground metal plate 32. Further, in the space surrounded by the metal case 1, the solid insulator 2 and the metal housing 34, a hygroscopic portion 33 is provided to adsorb moisture (including water vapor) existing in the space and increase the humidity. Suppress. This is a measure against a decrease in insulation characteristics when the humidity increases.

  In addition, as shown in FIG. 3, a breathing section 35 is provided in the space surrounded by the metal case 1, the solid insulator 2, and the metal housing 34 in order to further take moisture-proof measures. The breathing unit 35 includes a porous member having a hole diameter that allows gas to pass but not condensed moisture, and the moisture itself is surrounded by the metal case 1, the solid insulator 2, and the metal housing 34. To avoid entering the space. In addition, although the breathing part 35 and the moisture absorption part 33 may be used independently, when it uses together like a present Example, it suppresses that a water | moisture content enters in the breathing part 35, and temporarily enters as water vapor | steam. However, it is possible to prevent moisture from rising by absorbing moisture by the moisture absorbing portion 33 and to take moisture-proof measures in a complementary manner by different actions.

  As shown in FIG. 4, heat radiation fins 30 made of the solid insulator 2 are provided on the outer surface on the side surface side of the solid insulator 2 with an interval in the vertical direction. The radiating fin 30 is molded together when the solid insulator 2 is cast, so that the manufacturing process does not increase. The casting is achieved simply by changing the mold so that the heat dissipating fins 30 can be formed. Thus, the radiation fins 30 are formed on the surface of the solid insulator 2. By providing the radiation fins 30, the surface area of the solid insulator 2 is increased and the cooling performance is improved. In this specification, the case where the heat dissipating fins 30 are provided for the three phases is described as an example, but the mold switch that is at the highest temperature during use is located at the center where both ends are covered with the mold switch of the other phase. If the heat dissipation fins 30 are provided in the mold switch, the maximum temperature can be reduced and leveling can be achieved, which is effective. Of course, by providing the radiation fins 30 in each of the plurality of phases, it is possible to improve the cooling performance of each and reduce the overall temperature.

  About the three-phase aggregate | assembly of the mold switch comprised as mentioned above, cooling at the time of use and further insulation improvement are demonstrated.

  When the mold switch is turned on, the bus bushing 5 → bus bushing central conductor 20 → bushing fixed electrode 21 → spring contact 27 (upper side in FIG. 1) → ground disconnection section movable conductor 25 → spring contact 27 (see FIG. 1 middle lower electrode) → intermediate fixed electrode 23 → flexible conductor 24 → movable side conductor 15 → movable side electrode 13 → fixed side electrode 12 → fixed side conductor 14 → cushion center conductor 17 for cable, and load side through the cable To supply power. Since a large current flows in the mold switch, heat is generated in the current path. In the configuration in which the vacuum valve 3 and the ground disconnecting portion 4 are arranged close to each other and integrally molded with the solid insulator 2 as in this embodiment, the size can be reduced. As a result, it is necessary to improve heat dissipation.

  Therefore, in this embodiment, heat radiation fins 30 are provided on the surface of the solid insulator 2 to improve the heat radiation performance. Here, it is only necessary that the radiating fins 30 be arranged so that cooling can be promoted by convection, that is, an inclination in which such an effect is expected is defined as a substantially vertical direction. However, it is preferable that the radiating fins are oriented in the vertical (vertical) direction. In this case, the gas whose warming density is reduced rises, and the gas whose density is lowered falls when cooled by the ground metal plate 32 or the like. Convection is born efficiently.

  Further, in this embodiment, the mold switch for each phase is housed in the ground metal plate 32 for each phase individually. Thereby, it becomes possible to adjust the space between the mold switches of each phase. Therefore, a space is provided around the radiating fin 30 in the ground metal plate 32 so that air can easily enter. When the radiating fins 30 are provided as in the present embodiment, the amount of heat released from the radiating fins 30 becomes large. In such an aspect, providing a space around the radiating fins 30 is simply the solid insulator 2. It is also useful compared to the case where a space is provided around. In addition, the space itself surrounded by the ground metal plate 32 in which the mold switches of the respective phases are accommodated is an open system so that air from outside the space can also flow in.

  By doing as mentioned above, it is expected that the solid insulator 2 having high insulation characteristics will have improved cooling performance.

  On the other hand, the space surrounded by the metal case 1, the solid insulator 2, and the metal housing 34 is not covered with a solid insulator, and there are so many places as current paths such as the intermediate fixed electrode 23 and the flexible conductor 24. Therefore, both the amount of heat generation and the intensity of the heat generation are low compared to the space surrounded by the solid insulator 2. Therefore, in terms of cooling, there is a space as compared with the space surrounded by the solid insulator 2. However, regarding the insulation characteristics of the vacuum valve operation rod 19 and the operation rod 26, since the insulation characteristics are lower in the air than in the case of the solid insulator, the allowable amount for the increase in humidity is low. Therefore, the air surrounded by the solid insulator 2 is made to flow in as much as possible. However, in the space surrounded by the metal case 1, the solid insulator 2 and the metal housing 34, only the breathing part 35 enters and exits the air. The breathing part 35 prevents the inflow of moisture, and the moisture absorbing part 33 adsorbs the inflowing water vapor and moisture. From this point of view, the space surrounded by the solid insulator 2 needs to improve heat dissipation, whereas the space surrounded by the metal case 1, the solid insulator 2 and the metal housing 34 conversely enters and exits air. To improve the insulation characteristics. As described above, in this embodiment, a partition is provided in the space by paying attention to each characteristic in one apparatus.

  By configuring as in the present embodiment, it is possible to improve the cooling performance for places where cooling is necessary, and it is also possible to improve the insulation characteristics for places where it is necessary to improve the insulation characteristics more than cooling. Become.

  Example 2 will be described with reference to FIG. In the first embodiment, the case where the sliding mechanism is provided for connecting the vacuum valve operating rod 19 and the operating rod 26 to the metal housing 34 has been described. In this embodiment, an air bellows 40 is provided instead of the sliding mechanism. Yes.

  In the first embodiment, the breathing portion 35 is provided in the space surrounded by the metal case 1, the solid insulator 2, and the metal housing 34, allowing air to enter and exit, and preventing inflow of moisture. In the embodiment, the breathing part 35 is not provided and a sealed space is provided. And the dry air 41 is enclosed in this sealed space. By using the dry air 41, the moisture content can be reduced and the insulation characteristics can be improved.

  As in this embodiment, the operation rod can be moved while maintaining airtightness by using a bellows regardless of the sliding mechanism. Needless to say, the sliding mechanism and the bellows may be used together in the vacuum valve 3 and the air ground disconnection section 4, and any of them may be a sliding mechanism or a bellows.

  In addition, the configuration of the first embodiment can be used without providing the breathing unit 35 and forming a sealed space.

  Such replacement of members between the embodiments does not change the essence of the invention, and various modifications are possible.

  In the present embodiment, an example in which the assembly of the three-phase mold switches described in the first embodiment is mounted on the switch unit 50 will be described with reference to FIG.

  The assembly of mold switches is connected to the link mechanism 52 after the operation rods 19 and 26 come out of the metal housing 34. The link mechanism 52 is connected to the operation device 51. The assembly of the mold switches, the link mechanism 52, and the operation device 51 are further included in a ground metal plate 53 for the switch unit 50.

  With this configuration, the operating force generated by the operating device 51 is transmitted independently to the operating rods 19 and 26 via the link mechanism 52, and the closing and switching operations for the mold switches of each phase, Disconnecting operation and grounding operation can be realized.

  In addition, although the present Example demonstrated the example which mounted the aggregate | assembly of the mold switch demonstrated in Example 1, of course, the content directly demonstrated in Example 2 and various modifications can also be mounted in the switch unit 50. Needless to say.

  In the present embodiment, an example in which the switch unit 50 described in the third embodiment is further mounted on the switch gear 100 will be described with reference to FIG.

  In the switch unit 50, the cable 101 is connected to the cable bushing 6, and the cable 101 is connected to the load side. Thereby, the power received by the switch unit 50 from the bus side can be supplied to the load side. The switch unit 50 and the cable 101 are further accommodated in a metal housing 102.

  Other members housed in the metal housing 102 and constituting the switchgear 100 include, for example, protective relays, voltage detectors, current detectors, and the like. Needless to say, these can be mounted as necessary. .

DESCRIPTION OF SYMBOLS 1 Metal case 2 Solid insulator 3 Vacuum valve 4 Ground disconnection part 5 Bus bushing 6 Cable bushing 7 Fixed side ceramic insulating cylinder 8 Movable side ceramic insulating cylinder 9 Fixed side end plate 10 Movable side end plate 11 Vacuum vessel 12 Fixed side Electrode 13 Movable side electrode 14 Fixed side conductor 15 Movable side conductor 16 Arc shield 17 Cable bushing center conductor 18 Bellows 19 Vacuum valve operating rod 20 Busbar bushing center conductor 21 Bushing fixed electrode 22 Ground side fixed electrode 23 Intermediate fixed electrode 24 Flexible conductor 25 Ground disconnection section movable conductor 26 Operation rod 27 Spring contact 30 Radiation fin 31 Connection section 32 Ground metal plate 33 Moisture absorption section 34, 102 Metal housing 35 Breathing section 40 Air bellows 41 Dry air 50 Switch unit 51 Operator 52 Link Mechanism 100 Switch Gear 101 cable

Claims (13)

A fixed electrode; a movable electrode that can be contacted with and separated from the fixed electrode; a fixed conductor connected to the fixed electrode; and a movable conductor connected to the movable electrode; While supplying power to the side, the movable electrode is in contact with and away from the fixed electrode, a single-phase mold switch that switches on and off current is a three-phase combined mold switch assembly,
The mold switch of each phase includes a region where the outer periphery of the mold switch is covered with a ground metal plate and a region covered with a solid insulator,
Of the at least three-phase mold switches, a mold switch in which both ends are covered with a mold switch of another phase, the mold switch is characterized in that gas can flow around the area covered with the solid insulator. Aggregation. The mold switch assembly according to claim 1,
The three-phase mold switch is characterized in that a gas can flow around a region covered with the solid insulator for each phase. The mold switch assembly according to claim 1 or 2,
A mold switch assembly characterized in that fins extending in a substantially vertical direction are provided in a region covered with the solid insulator. The mold switch assembly according to any one of claims 1 to 3,
The ground metal plate and the solid insulator are hermetically connected,
The mold switch assembly characterized in that the area covered with the ground metal plate is sealed and sealed with dry air. The mold switch assembly according to any one of claims 1 to 3,
The ground metal plate and the solid insulator are hermetically connected,
The mold switch assembly characterized in that the area covered with the ground metal plate is moisture-proof against the outside of the area. The mold switch assembly according to claim 5,
The mold switch assembly is characterized in that the moisture-proofing is performed by a porous member that allows gas to pass through but does not allow condensed water to pass through. The mold switch assembly according to claim 5 or 6,
The mold switch assembly according to claim 1, wherein the moisture proof includes a moisture absorbing member disposed in a region covered with the ground metal plate. The mold switch assembly according to any one of claims 4 to 7,
Further, an air insulating rod for transmitting an operation force from an operating device to the movable conductor is disposed in the region covered with the ground metal plate. The mold switch assembly according to claim 8,
The air insulating rod and the ground metal plate are connected to an air bellows, and the air insulating rod and the air bellows, and the air bellows and the ground metal plate are airtightly connected. A mold switch assembly characterized by that. The mold switch assembly according to claim 8,
The mold switch assembly according to claim 1, wherein the air insulating rod is slidable with the ground metal plate in an airtight manner.   The mold switch assembly according to any one of claims 8 to 10, further comprising a switch that can be switched between closing, grounding, and disconnection, and a second switch that transmits an operating force from the controller to the switch. An air insulating rod is also disposed in a region covered with the ground metal plate.   12. The mold switch assembly according to claim 11, an operating device that exerts an operating force transmitted to each of the air insulating rods, a link mechanism connected to the operating device and the air insulating rods, and the mold switch A switch unit characterized in that the assembly, the operation unit, and the link mechanism are enclosed by a ground metal plate for the switch unit.   A switch comprising: the switch unit according to claim 12; a cable connected to the switch unit for supplying electric power to a load; and a housing having the switch unit and the cable therein. gear.