JPS634293B2 - - 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 expensive ceramic insulating cylinder. By making it a disc, it is easy to manufacture and the vacuum interrupter can be made inexpensive, but on the other hand, the air creepage distance between both live parts is the outer surface of the insulating disc, which is different from that of a general vacuum interrupter. Because it is shorter than that, the dielectric strength between the two live parts decreases, making it difficult to switch on and off the high voltage current, and the metal tank, which has the same potential as one live part, is exposed, increasing the installation space. There are problems such as causing problems such as causing problems, or making it difficult to attach to the wall of a switchboard, cubicle, etc.

The present invention has been made in view of the above-mentioned problems, and its object is to insulate a cup-shaped vacuum interrupter in a storage case in which a case cover made of synthetic resin is removably fixed to a case substrate made of synthetic resin. By burying the disc and storing it, the dielectric strength between the two live parts is improved, making it possible to switch on and off high-voltage current, and the installation space is significantly reduced. By integrally forming a cylindrical insulating barrier and making this insulating barrier a bushing through which the fixed side lead connected to the fixed electrode of the vacuum interrupter is inserted, consideration is given to ground insulation when installing it on a switchboard, cubicle, etc. The purpose of the present invention is to provide a vacuum switchgear that is easy to use. 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. A cup-shaped vacuum interrupter 2 for each phase, and an operation electromagnet 3 attached to the storage case 1 to open and close the vacuum interrupter 2 for each phase.
It is composed of etc. 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. The case board 4 is
It 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 A Y-shaped barrier 7 that divides the area into approximately three equal parts is integrally formed and erected. The barrier 7 partitions the vacuum interrupters 2 of each phase to increase their dielectric strength, and has a screw hole fitting 8 in the center for attaching the case lid 5.
is buried, and each end extends to the vicinity of the center of each side of the case substrate 4. In addition, the second
In the figure, reference numeral 9 indicates a ventilation hole, which is provided near the center of the barrier 7.

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 for inserting a lead. 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 molded, 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 together with the ventilation hole 9 of the case board 4 to ventilate the inside of the storage case 1 partitioned by the barrier 7. ,
Insert the bolts 17 screwed into the flange of the electromagnet case and the bolt insertion fittings 12 of the case lid 5, and screw them into the screw hole fittings 8. It is assembled using the bolts 18 that are attached.

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.
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 which is fitted into the section and is hermetically brazed, 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, and a portion of its bottom is hermetically brazed to the insulating disc 23. Vertical portion 25b at the bottom of two levels in the shield 25
A bottomed bellows 26 made of stainless steel or Inconel and concentrically housed in the vacuum container 19 like 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 are hermetically brazed.
A movable electrode rod 27 made of copper or a copper alloy is fitted into the center of the bottom of the bellows 26 and hermetically brazed to the bottom. 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 soldered to the outer end of the fixed electrode rod 28. , 27 and is made of copper or copper alloy and is screwed into one end of the fixed lead 29 through a screw hole 29a formed in the axial center thereof.
In the vacuum interrupter 2 for each phase having the above-described configuration, the insulating disk 23 and the stepped overhang portion 22a of the metal tank 22 are embedded in the case base 4 of the storage case 1, and the respective metal tanks 22 Near the bottom of is the recess 1 of the case lid 5.
3, and 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 insulating barrier 15 is inserted through the lead hole 14 of the case lid 5.
The center of the image is stretched. 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.
The movable electrode rod 27 in the stepped hole 30 has a substantially disk-shaped adsorbed plate 31 which is movable within a predetermined range in the axial direction (in the vertical direction in FIG. 5) within the stepped hole 30. They are screwed together. The attracted 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 bolts 17 inserted through 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. A cylindrical guide column 36 is integrally formed and erected at the center of the bottom of each coil case storage section 35, and a movable conductor, which will be described later, is movably inserted into the axial center of this guide column 36. and a stepped hole 3 for regulating its movement range.
7 is provided. Each coil case storage section 35 has a cylindrical coil case 39 made of synthetic resin in which a cylindrical iron core 38 is concentrically embedded.
is guided and stored by the guide column 36.
The coil case 39 includes the adsorbed plate 31 and the iron core 3.
A coil storage groove 41 is formed in the outer periphery of the core 38 to accommodate a coil 40 which together with the coil 8 constitutes an electromagnet, and is concentric with the core 38 and opens downward in FIG. A movable conductor 42 made of copper or copper alloy is inserted into the stepped hole 37 of the electromagnet case 33 in the axial direction (sixth direction).
The large-diameter portion 42a at one end formed to have a large diameter is engaged with the large-diameter portion 37a of the stepped hole 37, thereby preventing downward movement in FIG. regulated. A screw hole 43 is bored in the axial center of the large diameter portion 42a of the movable conductor 42, and the outer end of the movable electrode rod 27 protruding from the attracting plate 31 is screwed into the screw hole 43. has been done. Therefore, the movement of the movable conductor 42 in the axial direction is restricted in addition to its upward movement being restricted by the above-described attracted plate 31. A similar ventilation hole (not shown) is provided in the flange 32 of the electromagnet case 33 at a position corresponding to the ventilation hole 9 of the case substrate 4 of the storage case 1. Further, in FIG. 6, reference numeral 44 indicates 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.
The storage case 1, which is integrally attached to the electromagnet case 33, is attached and supported by the support frame 45 by screwing the end portion into the screw hole fitting 44.

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 storage recess 54a. The spring retainer 54 can be attached to the vacuum interrupter 2 by adjusting the distance between it and the spring receiver 56.
It also has the function of adjusting the distance between the open electrodes,
It is fixed in a desired position by a connecting fitting 53 that functions as a lock nut. Also, ammunition 5
7 is for alleviating the impact force when the interrupter 2 is opened by the operation electromagnet 3 and applying contact pressure to the movable electrodes 20 and 21 for fixing 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 a hole 62 provided in the mounting flange 46 and a structure 63 bored in the inner wall of the support tube 47. The other end is connected to a connecting fitting 53 screwed onto the movable conductor 42 .

In the vacuum switchgear constructed as described above, by exciting each coil 40 of the operating electromagnet 3, each attracted member 31 is attracted to each iron core 38, 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 separated from the fixed electrode 20 to open it, and by demagnetizing each coil 40, the vacuum interrupter 2 of each phase is opened by a self-closing force. While being operated to close, the fixed and movable electrodes 20 and 21 are brought into pressure contact by the action of the bullet 57.

As described above, the present invention provides a vacuum container by closing the opening of a bottomed cylindrical metal tank with an insulating disk, and a fixed electrode rod provided with a fixed electrode at the inner end at the bottom of the metal tank of the vacuum container. A vacuum switchgear is constructed by using a vacuum interrupter, which is constructed by inserting and inserting a movable electrode rod into an insulating disc, and a movable electrode rod having a movable electrode that connects and separates from a fixed electrode is movably inserted into the insulating disc, and a housing made of synthetic resin. The protruding end of the metal tank of the vacuum interrupter and the insulating disk are buried and housed in the case substrate of the case, and a cylindrical insulating barrier for inserting the fixed electrode rod is integrally molded in the storage case. Because of these characteristics, the dielectric strength between both live parts in a so-called cup-shaped vacuum interrupter can be increased, and a vacuum switchgear using this vacuum interrupter can be used for high voltage applications. Furthermore, since the metal tank serving as the charging part is housed in a storage case made of synthetic resin, the installation space can be significantly reduced. Furthermore, by inserting the fixed side lead through the cylindrical insulating barrier that is integrally formed with the case lid of the storage case, there is no need to provide separate bushings, and there is no need to consider earth-proof insulation, so it is easy to install on switchboards, etc. This provides effects such as extremely easy installation.

[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 partially cutaway perspective view.
A cross-sectional view taken along the line - in the figure, and FIG. 6 is a longitudinal cross-sectional view of the main part of the present invention. 1...Storage case, 2...Vacuum interrupter,
15... Insulating barrier, 19... Vacuum container, 20...
... fixed electrode, 21 ... movable electrode, 22 ... metal tank, 23 ... insulating disk, 27 ... movable electrode rod,
28...Fixed electrode rod, 29...Fixed side lead.

Claims (1)

[Scope of Claims] 1. A fixed electrode rod in which the opening of a cylindrical metal tank with a bottom is closed with an insulating disc made of ceramic to form a vacuum container, and a fixed electrode is provided at the inner end at the bottom of the metal tank. In a vacuum switchgear using a vacuum interrupter configured by inserting and inserting a movable electrode rod having a movable electrode that comes into contact with and away from the fixed electrode into the insulating disk so as to be movable, the vacuum interrupter is made of synthetic resin. A storage case is constructed by removably fixing the edge of a case lid made of synthetic resin to a case substrate having a predetermined wall thickness, and a three-phase vacuum interrupter is provided within the storage case, and the vacuum interrupter of each phase is The vacuum container is constructed by fixing an insulating disk to a stepped overhang provided at the opening of a bottomed cylindrical metal tank, and embedding the stepped overhang and the insulating disk in the case substrate. A vacuum switching device characterized by a structure in which an insulating barrier surrounding the fixed side leads of each phase vacuum interrupter is integrally molded on the outside of the case lid, and a barrier for three-phase division is provided inside the storage case.