JPS634294B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vacuum switchgear, and more particularly, a cylindrical metal tank with a bottom is closed with an insulating disc made of ceramic to form a vacuum container, and a pair of electrodes are installed in the vacuum container. This invention relates to a vacuum switchgear using a so-called cup-shaped vacuum interrupter, which is constructed by housing a vacuum interrupter so that it can be freely approached and separated.

The so-called cup-shaped vacuum interrupter mentioned above is compared to a general vacuum interrupter in which both ends of an insulating tube are closed with metal end plates to form a vacuum container, and a pair of electrodes are housed in this vacuum container so that they can be moved toward and away from the vacuum interrupter. By easily increasing the outer diameter of the container, it is possible to switch on and off a large amount of current, and the insulating member for insulating both live parts can be replaced with an insulating tube made of ceramic or glass. By making it a circular plate, it is easier to manufacture and the vacuum interrupter can be made inexpensive. On the other hand, the air creepage between both live parts becomes the outer surface of the insulating disk, making it difficult to manufacture the vacuum interrupter in a typical vacuum interrupter. Since the length is shorter than that, the dielectric strength between the two live parts decreases, and there is a problem that it becomes difficult to switch on and off the high voltage current. To deal with this problem, it has been considered to mold the entire cup-shaped vacuum interrupter with synthetic resin, but this results in problems such as increasing the weight of the switchgear itself or impeding heat dissipation of the vacuum interrupter, whose temperature increases when energized.
Furthermore, since the metal tank, which has the same potential as one of the live parts, is exposed, there are problems such as an increase in the actual installation space or difficulty in installing it on a switchboard, cubicle, etc.

The present invention has been made in view of the above-mentioned problems, and its object is to arrange cup-shaped vacuum interrupters in a triangular shape and to embed each insulating disk in a case substrate made of synthetic resin. It improves the dielectric strength between both live parts on the outside, making it possible to switch on and off high-voltage current, and also partitions each vacuum interrupter through a barrier formed integrally with the case substrate, and also creates a space through the case lid. By enclosing the vacuum interrupter, it is possible to improve the dielectric strength between each phase and significantly reduce the installation space.Furthermore, by providing ventilation holes in the case board and case lid, the temperature rise of each vacuum interrupter is reduced. The purpose of the present invention is to provide a three-phase vacuum switchgear that can perform Hereinafter, one embodiment of the present invention will be described in detail using the drawings.

FIG. 1 is a partially cutaway perspective view of a vacuum switchgear according to the present invention. It is composed of a cup-shaped vacuum interrupter 2 for three phases, an operating electromagnet 3 attached to a storage case 1 to open and close the vacuum interrupter 2 for each phase, and the like. The storage case 1 is made of cast-molded synthetic resin such as epoxy, glass fiber-filled polyester, or Primix, and includes a triangular base substrate 4, a triangular box-shaped case lid 5 attached to the base substrate 4, and It is provided in a hollow shape. Case board 4
is for attaching the vacuum interrupter 2 of each phase as described later, and as shown in FIG. 2, bolt holes 6 for attaching the case lid 5 are provided near each corner, and the plate A Y-shaped barrier 7 that divides the surface into approximately three equal parts is integrally formed and erected. The barrier 7 is a vacuum interrupter 2 for each phase.
The area between the two is divided to increase its dielectric strength.
A metal fitting 8 with a screw hole for attaching the case lid 5 is buried in the center, and each end extends to the vicinity of the center of each side of the case substrate 4. In addition,
In Fig. 2, 9 indicates the ventilation hole, and the barrier 7
It is located near the center of the

As shown in FIGS. 1 and 3, the case lid 5 has a triangular box shape with a triangular ceiling portion 5a and integrally molded side wall portions 5b hanging from each side. Similar to the case board 4, bolt holes 10 are provided in the mounting flange 5c formed in the part. A Y-shaped groove 11 is bored in the ceiling part 5a and side wall part 5b inside the case lid 5, as shown in FIGS. 3 and 4. In this groove 11, the barrier 7 is inserted into the storage case 1.
It is engaged to divide it into equal parts, and in the center there is a
A ring-shaped bolt insertion fitting 12 is embedded. Further, near each corner of the ceiling portion 5a, a circular recess 13 is bored into which the bottom of a metal tank of each vacuum interrupter 2, which will be described later, is engaged. A lead hole 14 is provided through which the lead hole 14 is inserted. And, on the ceiling part 5a on the outside of the case lid 5,
As shown in FIG. 1, a cylindrical insulating barrier 15 is integrally formed, through which the fixed side lead is inserted as described later, and which also serves as a bushing when this switchgear is attached to a switchboard, cubicle, etc. (not shown). Note that the reference numeral 16 in FIG. 3 is a ventilation hole, which is used to ventilate the inside of the storage case 1 divided by the barrier 7 together with the ventilation hole 9 of the case board 4.
are the bolt holes 12 of the case lid 5 and the case board 4,
6 and a bolt 17 screwed into the flange of the electromagnet case, which will be described later, and a bolt insertion fitting 12 of the case lid 5 and a metal fitting 8 with a screw hole.
It is assembled with a bolt 18 screwed into the.

As shown in FIGS. 1, 2, and 5, each chamber partitioned by the Y-shaped barrier 7 in the storage case 1 is equipped with a vacuum interrupter 2 for three phases, with a portion of the chamber separated by the Y-shaped barrier 7. It is embedded and stored in the board 4. Therefore, vacuum interrupter 2 for each phase
are arranged in a triangular shape. Each vacuum interrupter 2 is a self-closing type that is closed by a pressure difference between the inside and outside, and includes a cup-shaped vacuum container 19 and fixed and movable electrodes 2 that can be freely connected and separated and housed in the vacuum container 19.
0, 21, etc. Vacuum container 19
The metal tank 22 is made of Fe-Ni-Co alloy or Fe-Ni alloy and has a cylindrical shape (cup shape) with a bottom and a stepped overhang 22a extending outward near the opening of the metal tank 22. It is closed by an insulating disk 23 made of ceramic that is fitted into the section and brazed airtight, and the inside thereof is evacuated to a high vacuum. A hole 24 is provided in the center of the insulating disk 23 of the vacuum vessel 19, and a hole 24 is formed in the hole 24 from the Fe-Ni-Co alloy or Fe-Ni alloy housed concentrically in the vacuum vessel 19. A cylindrical shield 25 having a two-step bottom is
It is fitted through a cylindrical portion 25a that opens and extends axially outward from the center of its bottom portion, and a portion of its bottom portion is hermetically brazed to the insulating disk 23. Vertical portion 25b at the bottom of two levels in the shield 25
A bottomed bellows 26 made of stainless steel or Inconel, which is housed concentrically in the vacuum container 19 in the same way as the shield 25, has a cylindrical portion 26a extending axially outward from the outer diameter side of its opening. They are fitted through each other and brazed in an airtight manner.
A movable electrode rod 27 made of copper or copper alloy is fitted into the center of the bottom of the bellows 26 and hermetically brazed to the bottom, and a movable electrode rod 27 made of the same metal is inserted into the inner end of the bellows 26 and protrudes into the vacuum vessel 19. A movable electrode 21 is brazed. Further, a fixed electrode rod 28 made of copper or copper alloy is inserted into a hole provided at the center of the bottom of the metal tank 22 of the vacuum container 19, and a flange-shaped current collector portion 28a integrally formed on the body of the fixed electrode rod 28 is inserted. It is secured through the holder and is airtightly brazed. The fixed electrode 20 made of copper or copper alloy, to which the movable electrode 21 is connected and separated, is brazed to the inner end of the fixed electrode rod 28, and the fixed electrode 20, which is made of copper or a copper alloy, is brazed to the outer end of the fixed electrode rod 28. 2
A fixed lead 29 made of copper or copper alloy and extending coaxially with the leads 8 and 27 is screwed into one end of the fixed lead 29 through a screw hole 29a formed in the axial center. Then, a vacuum interrupter 2 for each phase having the above-mentioned configuration is provided.
, the insulating disc 23 and the stepped overhang 22a of the metal tank 22 are buried in the case base 4 of the storage case 1, and the bottom of each metal tank 22 is buried in the recess 13 of the case lid 5.
The outer periphery of the metal tank 22 is separated from the Y-shaped barrier 7 with an appropriate space.

In addition, the fixed electrode rod 28 of each vacuum interrupter 2
The fixed side lead 29 connected to the housing is inserted through the lead hole 14 of the case lid and extends through the center of the insulating barrier 15. Further, the outer end of each movable electrode rod 27 is inserted through a stepped hole 30 (see FIG. 5) provided in the case substrate 4, and the movable electrode rod 27 in the stepped hole 30 has a stepped hole. 3
Axial direction within 0 (vertical direction in Figure 5)
A substantially disc-shaped adsorbed plate 31, which is movably provided within a predetermined range, is screwed thereto. Adsorption plate 31
is made of a magnetic material such as iron, and constitutes a part of the operating electromagnet 3, which will be described later, and is attracted to its iron core and moved downward in FIG. 5.

As shown in FIGS. 1 and 6, the storage case 1 is equipped with an operating electromagnet 3 for operating each vacuum interrupter 2 housed in the storage case 1. That is, the storage case 1 includes an electromagnetic case 33 having a triangular flange 32 similar to the case substrate 4, and the case lid 5 and the case It is attached by screwing into a bolt hole 17 that passes through the bolt holes 10 and 6 of the board 4. The electromagnet case 33 is made of synthetic resin molded by casting like the storage case 1, and the flange 32 at the position corresponding to the vacuum interrupter 2 of each phase stored in the storage case 1 has a bottomed cylindrical shape. The coil case storage portions 35 are each integrally molded. Each coil case storage section 35
A cylindrical guide column 36 is integrally molded and stands in the center of the bottom of the guide column 36.
A stepped hole 37 is provided at the axial center of the movable conductor to allow a movable conductor (to be described later) to move therethrough and to restrict its movement range. A cylindrical coil case 39 made of synthetic resin in which a cylindrical iron core 38 is concentrically embedded is housed in each coil case storage section 35 while being guided by a guide column 36 . The coil case 39 includes the adsorbed plate 31,
It is for storing a coil 40 that constitutes an electromagnet together with the iron core 38, and a coil storage groove 41 that opens downward in FIG. . A movable conductor 42 made of copper or copper alloy is fitted into the stepped hole 37 of the electromagnet case 33 so as to be movable in the axial direction (in the vertical direction in FIG. 6), and one end formed with a large diameter By engaging the large portion 42a with the large diameter portion 37a of the stepped hole 37, downward movement in FIG. 6 is restricted. A screw hole 43 is bored in the axial center of the large diameter portion 42a of the movable conductor 42.
3 includes a movable electrode rod 2 protruding from the adsorption target plate 31.
The outer end of 7 is screwed. Therefore, the movable conductor 4
2 is restricted from moving upward by the above-mentioned adsorbed plate 31, and its range of movement in the axial direction is also restricted. A similar ventilation hole (not shown) is provided in the electromagnet case 33 at a position corresponding to the ventilation hole 9 of the case substrate 4 of the storage case 1 in the flange 32. Further, in FIG. 6, reference numeral 44 denotes a metal fitting with a screw hole embedded in the outer bottom of each coil case storage section 35, and is used to attach a support frame 44, which will be described later.

A support frame 45 is attached to the electromagnet case 33 for attaching and supporting the switchgear to a switchboard or cubicle (not shown) or the like.
The support frame 45 is made of synthetic resin molded by casting like the storage case 1, the electromagnet case 33, etc., and has a triangular mounting flange 46 similar to the case substrate 4 of the storage case 1, and a triangular mounting flange 46 of the mounting flange 46. A cylindrical support tube 47 is integrally molded on one surface of the electromagnet case 33 at a position corresponding to each coil case housing 35, and a cylindrical support tube 47 is integrally molded on the other surface of the mounting flange 46 at a position corresponding to each support tube 47. It is composed of an insulating barrier 48 and the like. That is, each corner of the mounting flange 46 is provided with a bolt hole 49, and a bolt 50 is inserted into each bolt hole 49 to be screwed into the wall of a switchboard or the like in order to attach the switchgear to the switchboard or the like. It is something that will be done. And, in the support frame 45,
A plurality of bolt holes 51 passing through the mounting flange 46 and the body of each support tube 47 are provided, and the ends of the bolts 52 inserted into each bolt hole 51 are inserted into each coil case storage section 35 in the electromagnet case 33.
By screwing into the screw hole fitting 44 at the end of the electromagnet case 33 and this electromagnet case 3
The storage case 1 integrally attached to the storage case 3 is attached and supported by the support frame 45.

Inside each support cylinder 47 of the support frame 45,
The other end of the movable conductor 42 mentioned above is protruded,
A small-diameter screw portion 42b is formed at the end thereof. A connecting fitting 53 to which a flexible lead, which will be described later, is connected, and a spring retainer 54 are screwed into the small-diameter screw portion 42b. The spring retainer 54 has a circular spring storage recess 54a bored in the center of its body, and a disk-shaped spring is attached to the mounting flange 46 by a plurality of bolts 55 facing the spring storage recess 54a. A bullet device 57, such as a compression coil spring, is loaded between the receiver 56 and the spring retainer 54, with a portion thereof stored in the spring housing recess 54a. The spring retainer 54 also has the function of adjusting the distance between the openings of the vacuum interrupter 2 by adjusting the spacing between the spring receivers 56, and is fixed at a desired position by a connecting fitting 53 that functions as a lock nut. It is something. Also, ammunition 57
is used to reduce the impact force when the vacuum interrupter 2 is opened by the operating electromagnet 3, and to apply contact pressure to the fixing and movable electrodes 20 and 21 of the vacuum interrupter 2, which is closed by the self-closing force. . In each spring receiver 56, a movable lead 59 made of copper or copper alloy is inserted through the center of the insulating barrier 48 and through the hole 58 of the mounting flange 46, and a small diameter screw is formed at the end thereof. A connecting fitting 61 to which one end of the flexible conductor 60 is connected is screwed into the movable lead 59 in contact with the mounting flange 46 in order to fix the movable lead 59. ing. The flexible conductor 60 is for electrically connecting the movable conductor 42 and the movable lead 59, and is movable through the hole 62 provided in the mounting flange 46 and the groove 6 bored in the inner wall of the support tube 47. It is inserted,
The other end is a connecting fitting 5 screwed onto the movable conductor 42.
Connected to 3.

In the vacuum switchgear constructed as described above, each attracted plate 31 is attracted to each iron core 38 by exciting each coil 40 of the operating electromagnet 3, and the movable electrode rod 27 of each phase is simultaneously moved downward as shown in FIG. At the same time, the movable electrode 21 is moved to the fixed electrode 2
By demagnetizing each coil 40, the vacuum interrupter 2 of each phase is closed by the self-closing force, and the action of the ammunition 57 is activated. Therefore, the fixed and movable electrodes 20 and 21 are brought into pressure contact.

As described above, the present invention uses a vacuum interrupter constructed by closing a bottomed cylindrical metal tank with an insulating disc made of ceramic to form a vacuum container, and storing a pair of electrodes in the vacuum container so as to be able to freely approach and separate the tank. A Y-shaped vacuum switchgear is provided in which the vacuum interrupters are arranged in a triangular shape, each insulating disk is embedded in a case substrate made of synthetic resin, and each vacuum interrupter is integrally formed in the case substrate. The space between the two live parts in the cup-shaped vacuum interrupter is divided by a barrier and surrounded by a space provided by a case lid made of synthetic resin attached to the case board, and ventilation holes are provided in the case board and the lid. The dielectric strength of the vacuum interrupter can be increased, and a vacuum switchgear using this vacuum interrupter can be used for high voltage applications.
In addition, since the vacuum interrupters of each phase are separated by barriers and surrounded by a case lid with a space, it is possible to make each vacuum interrupter compact while improving mutual dielectric strength. The actual installation space can be significantly reduced. Furthermore, since the case board and case lid are provided with ventilation holes, each vacuum interrupter can be effectively cooled. It has the advantage of being able to open and close.

In addition, in the above-mentioned embodiment, the case where the barrier that partitions each vacuum interrupter is integrally molded on the case substrate is described in detail, but the invention is not limited to this. For example, it may be integrally molded on the case lid or separately molded. It is also possible to adopt a structure in which this is engaged with the case substrate or the case lid. The present invention also includes embodiments in which various changes have been made without departing from the technical scope of the present invention.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of a vacuum switchgear according to the present invention, Fig. 2 is a plan view of the main part of the invention, Fig. 3 is a bottom view of the main part of the invention, and Fig. 4 is a FIG. 3 is a partially cutaway perspective view, FIG. 5 is a sectional view taken along the - line in FIG. 2...Vacuum interrupter, 4...Case board,
5... Case lid, 7... Barrier, 9, 16... Vent hole, 19... Vacuum container, 20, 21... Electrode,
22...metal tank, 23...insulating disk.

Claims (1)

[Claims] 1. A vacuum switchgear comprising a bottomed cylindrical metal tank closed with an insulating disc made of ceramic to form a vacuum container, and a vacuum interrupter configured by storing a pair of electrodes in the vacuum container so as to be able to be freely connected and separated. The vacuum interrupters are arranged in a triangular shape, each insulating disk is embedded in a case substrate made of synthetic resin, and each vacuum interrupter is partitioned by a Y-shaped barrier formed integrally with the case substrate. 1. A vacuum opening/closing device characterized in that a space is surrounded by a case lid made of synthetic resin attached to a case substrate, and a ventilation hole is provided in the case substrate and the case lid.