JP2854744B2 - Metal closed switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal-closed switchgear in which an insulating gas is sealed and a vacuum circuit breaker is housed in multiple stages.

[0002]

2. Description of the Related Art FIGS. 5 (a) and 5 (a) show a front view of a conventional air-insulated metal-closed switchgear (hereinafter simply referred to as a switchgear) in which a vacuum circuit breaker is housed in multiple stages. In FIG. 5B, which shows a right side view of FIG. 5A, a handle 46a is provided on the front surface of a box 41 whose outer periphery is surrounded by mild steel plates.
A door 46 that is opened and closed with is attached, and on the rear surface of the box 41,
A back plate (not shown) is screwed.

A drawer unit 42a in which a drawer-type high-pressure vacuum circuit breaker 42 is mounted so as to be able to be pulled out is mounted inside the box 41 in three stages vertically. The main circuit terminal is connected to the front end of the fixed-side main circuit terminal in the upper stage of the drawer unit 42a at the disconnecting portion 49A. Similarly,
The movable main circuit terminal below the rear end of the vacuum circuit breaker 42
The disconnecting portion 49B of the same product as 49A is connected to the front end of the inverted L-shaped fixed main circuit terminal at the lower stage of the drawer unit 42a.

On the lower surface of the ceiling of the box 41, three insulators 45 are provided.
Are fixed at equal intervals in the front-rear direction. To these insulators 45, horizontal busbars 43 of copper strips are fixed to the lower part of the ceiling in parallel to the left and right. At the rear end of the box 41,
Three vertical buses 44 are attached in parallel via insulators (not shown) attached to a mounting plate (not shown), and the upper ends of these vertical buses 44 are connected to the horizontal bus 43 and connected to the disconnecting portions 49A. The rear end of the fixed-side main circuit terminal is connected. Also, on the right side of each drawer unit 42a,
The wound current transformers 51 are vertically mounted, and the lower terminals of these wound current transformers 51 are connected by conductors 52 to each drawer unit.
The upper end of the current transformer 51 is connected to the lower end of the fixed-side main circuit terminal on the lower side of 42a, and the upper end of the wire-type current transformer 51 is attached to the upper end of a cable 50 raised from the right side of the installation floor of the box 41. Connected to the omitted compression terminal. Cable 50 is a box
Supported by a cable support 47 attached to the right side of 41,
At the lower end of the box 41, a zero-phase current transformer 48 through which each cable 50 passes.
Is attached.

[0005]

However, in the switchgear constructed as described above, the mounting interval between the vacuum circuit breaker 42 and the wire-type current transformer 51 may be stuck on the surface during a long-term operation. Or, it must be wide in consideration of the dust that accumulates, so not only the outer shape of the box and the floor area of the installation place become wide, but also in places where the installation environment is particularly bad,
Frequently, it is necessary to stop the load by turning off the upstream circuit breaker to remove dust on the surface of the insulating material of the main circuit device, so that not only maintenance is troublesome but also the load operation rate is reduced. Therefore, especially in a switchgear installed in a substation in an urban area, land prices have soared, and such a switchgear having a large installation area has become impossible to cope with.

Accordingly, an object of the first, second and third aspects of the invention is to provide a gas-insulated switchgear capable of increasing the number of vacuum circuit breakers to be stored without increasing maintenance work and increasing the installation area. Is to get.

[0007]

Means and operation for solving the problem] corresponding to claim 1
Invention is provided with a partition wall for partitioning airtightly the box body back and forth, the equipment room provided on one side of the partition wall, a bus chamber provided on the other side of
In a closed metal switchgear, the equipment room is located on one side.
A vacuum circuit breaker housed in multiple stages up and down and a true
And an operation mechanism for inputting and off the air circuit breaker, busbar chamber, the machine
A vertical bus connected to a vessel chamber vacuum breaker, the movable side equipment
Is connected to a vacuum circuit breaker chamber fixed side is connected to the longitudinal busbar machine
And a disconnector that are input and switching in vessel chamber of the operating mechanism, the insulation gas is characterized in that it is sealed.

[0008] Metal closed form Sui of invention corresponding to claim 2
Tchigiya is a front bulkhead and a rear <br/> bulkhead for partitioning airtightly the box body back and forth is provided, set the bus chamber between the front bulkhead and the rear bulkhead
Equipment rooms are provided outside the front and rear partitions.
It is characterized by having .

[0009] Metal closed form Sui of invention corresponding to claim 3
Switch gear is the rear end of the upper terminal of the vacuum valve of the vacuum circuit breaker.
To the movable side of the disconnector, and connect the vacuum valve of the vacuum circuit breaker.
A connection electrode is formed at the front end of the lower terminal.
Terminals, lower terminals and connection electrodes are integrally molded and covered with insulating resin
It is characterized by having done .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the gas-insulated switchgear of the first invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a switchgear of the present invention, and FIG. 2 is an enlarged detail view of a partial longitudinal section of FIG. 1 and 2, a box 1
Is composed of a front equipment box 6 and a rear bus box 7, and a front door (not shown) is attached to the front end of the equipment box 6.

As shown in FIG. 2, four circular holes 5a are formed at equal intervals in the vertical direction in the partition plate 5 on the front face of the busbar box 7, and are disposed vertically in front of each hole 5a. The vacuum circuit breakers 2 described below are hermetically mounted via O-rings (not shown) mounted on the outer peripheral front surface of each hole 5a. Below these vacuum circuit breakers 2, through-type current transformers 11 are attached to the partition plates 5, respectively.
An upper terminal 16a is provided above the vacuum valve 16 of the vacuum circuit breaker 2.
The lower electrode 16b of the vacuum valve 16 extends forward, and a connection electrode 12 having a vertically concave cylindrical recess is formed at the front end thereof. It has become. On the rear lower surface of the lower terminal 16b,
The upper end of the insulating operating rod 13 is joined, and the lower end of the insulating operating rod 13 is connected to a connecting portion 13a connected to an operating mechanism described later.
It has become. These vacuum valve 16, upper terminal 16a,
The lower terminal 16b and the connection electrode 12 are made of an insulating layer 17 of epoxy resin.
The insulating layer 17 has a ground layer on the surface.
A blind plug 19, which is not shown in detail, is removably attached to an opening above the connection electrode 12. Connection electrode 12
The upper end of the cable 10 is connected to the lower end of the cable 10 in a staggered manner via a connection pipe (not shown), and the upper end of the cable 10 is fixed to the insulating layer 17 below the connection electrode 12 by a fixing tool (not shown) attached to the jacket. The lower end of the cable 10 passes through a zero-phase current transformer (not shown) mounted in a cable pit (not shown) formed on the installation surface of the box 1. On the other hand, a base end of a blade 14a of the disconnector 14 is attached to a rear portion of the upper terminal 16a.

On the other hand, on the upper surface of the ceiling plate of the box 1,
A T-shaped bushing 8 disclosed in Japanese Patent Application Laid-Open No. 60-160309 has a lower part penetrated through a ceiling plate, and is attached at an oblique interval from a front left side of the box body 1 to a rear right side of the box body 1 in a plan view (not shown). The lower ends of the T-shaped bushings 8 are connected to the upper ends of conductors 4 vertically arranged at the rear of the box 1, respectively. Each is fixed with a insulator. Fixed contacts 14b are attached to the front surfaces of the conductors 4 at positions behind the broods 14a by projecting the contact pieces forward.

A circular hole (not shown) is formed in the partition plate 5 on the right side of each hole 5a shown in FIG. 2, and an electric operating mechanism 3 (not shown in detail) is provided in front of the circular hole in FIG. It is fixed as shown. The operating mechanism 3 houses a circuit breaker operating mechanism (not shown) at the lower part and a disconnector operating mechanism (not shown) at the upper part, and the link (not shown) on the output side of the circuit breaker operating mechanism is connected to the connecting portion 13a described above. The output side of the disconnection section operating mechanism is connected to the right end of a link mechanism (not shown) mounted laterally on the back surface of the partition plate 5 behind the disconnector operating mechanism and the vacuum circuit breaker 2. The left end is the blade 14a shown in FIG.
Is connected to a connection shaft between the base end of the upper terminal 16a and the upper terminal 16a. In the switch gear configured as described above, after assembly is completed, for example, an insulating gas such as sulfur hexafluoride gas is sealed in the busbar box 7, and a switchgear for power reception (not shown) adjacent to the box 1. A cable is connected from the T-shaped bushing on the ceiling of the box 1 to the T-shaped bushing 8 attached to the upper surface of the ceiling of the box 1, via the cables 10 from the disconnectors 14 and the vacuum circuit breakers 2, and not shown. Supply power to the load. When performing a withstand voltage test or insulation resistance measurement at the time of a shipping test or periodic inspection, the blind plug 19 at the upper end of the cable connection portion 15 is removed and a connection cable is connected.

The outer periphery of the vacuum circuit breaker 2 is an insulating layer 17.
It is possible to reduce the space between the upper and lower vacuum circuit breakers 2 and the space between the upper and lower vacuum circuit breakers 2 and the operation mechanism 3 on the right side. The number of mounted vacuum circuit breakers can be increased. In the above embodiments, the instrument box 6 symmetrically connected to the rear of the bus box 7, and the conductor 4 in a common vertical bus 請
An invention corresponding to claim 2 may be provided. In this case, although both sides are maintenance type, there is an advantage that the floor space for installation can be further reduced by sharing the bus box 7.

FIG. 3 is a partial longitudinal sectional view showing another embodiment of the switchgear of the first and second inventions. The connection electrode 12 of the vacuum circuit breaker 22 is a T-shaped cable connection portion 25. . Also in this case, a detachable plug 29 is attached to the upper end of the connection electrode 12, and is used as a connection portion when measuring the withstand voltage value and the insulation resistance of the main circuit device. FIG. 4 is a partial longitudinal sectional view showing another embodiment of the switchgear of the present invention. The lower terminal 16c of the vacuum valve 16 slightly protrudes from the insulating layer 17, and a conical portion is formed around the protrusion of the lower terminal 16c. One side of a T-shaped bushing 35 is connected from the front of a vacuum circuit breaker 32 having a trapezoidal insulating layer. In this case, since the operation of removing the blind plug 29 and connecting the test cable is performed on the front side, there is an advantage that the test cable of the uppermost vacuum circuit breaker, which is particularly difficult to perform, can be easily connected. In the above embodiment, the case where the circuit breaker housed inside is a vacuum circuit breaker has been described, but for example, a vacuum contactor may be used. Further, the partition plate 5 may be bent in a Z-shape to make the mounting surface of the operation mechanism 3 concave.

[0016]

Effect of the Invention] According to the invention corresponding to claim 1, provided with a partition wall for partitioning airtightly the box body back and forth of the partition wall
The equipment room is provided on the one side, a metal closed having a busbar chamber on the other side
In a chain-type switchgear, the equipment room has multiple stages up and down on one side.
Vacuum circuit breaker housed on the other side and vacuum circuit breaker provided on the other side
The a ON-OFF operating mechanism, busbar chamber, the true equipment room
The vertical bus connected to the empty circuit breaker, and the movable side is connected to the vacuum circuit breaker in the equipment room and the fixed side is connected to the vertical bus to operate the equipment room.
A disconnecting switch that is turned on and off by the operating mechanism is provided.By filling the bus chamber with insulating gas, the withstand voltage characteristics between the charged part of the main circuit device and the ground potential and between the main circuit devices are increased, and each main circuit Since the mounting intervals of the devices are narrowed, it is possible to obtain a metal-closed switchgear that is easy to maintain and can accommodate more vacuum circuit breakers without reducing the floor area of the box and increasing the outer shape of the box. .

According to the invention corresponding to claim 2,
The front bulkhead and rear bulkhead for partitioning the airtight provided a box body back and forth,
A busbar is provided between the front partition and the rear partition, and the front partition and
In Rukoto respectively provided equipment room on the outside of the rear bulkhead, raising the withstand voltage characteristics between and between the main circuit device and the charging unit ground potential of the main circuit devices, since narrowing the mounting intervals of the main circuit devices, the box It is possible to obtain a metal-closed switchgear that is easy to maintain and can accommodate more vacuum circuit breakers without increasing the installation floor area.

Further, according to the invention corresponding to claim 3 , a disconnector is provided at the rear end of the upper terminal of the vacuum valve of the vacuum circuit breaker.
And the lower terminal of the vacuum valve of the vacuum circuit breaker
A connection electrode is formed at the front end of the vacuum valve, upper terminal, lower terminal
Since the external terminals and connection electrodes are integrally molded and covered with insulating resin, it is possible to obtain a metal-closed switchgear that is easy to maintain and can increase the number of vacuum circuit breakers to be stored without increasing the installation floor area of the box. it can.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a metal-closed switchgear of the first, second and third inventions.

FIG. 2 is a partial longitudinal sectional view of FIG.

FIG. 3 is a partial longitudinal sectional view showing another embodiment of the metal-closed switchgear of the first, second and third inventions.

FIG. 4 is a partial longitudinal sectional view showing another embodiment different from FIG. 3 of the metal-closed switchgear of the first, second and third inventions;

5A and 5B are views showing an example of a conventional metal-closed switchgear, in which FIG. 5A is a front view, and FIG. 5B is a right side view.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... box body, 2 ... vacuum circuit breaker, 3 ... operation mechanism, 4 ... conductor,
5: Partition plate, 6: Equipment box, 7: Busbar box, 8: T-shaped bushing, 10: Cable, 11: Winding current transformer, 14: Disconnector.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tetsuo Yoshida 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the Fuchu Plant, Toshiba Corporation (72) Inventor Yasufumi Nagata 1-1-1, Shibaura, Minato-ku, Tokyo Stock Company (72) Inventor Masaki Ikuta 1 Toshiba-cho, Fuchu-shi, Tokyo Toshiba Fuchu Plant (56) References JP-A-54-35336 (JP, A) (58) Fields investigated ( Int.Cl. ⁶ , DB name) H02B 1/30 H01H 33/66 H02B 1/20

Claims (3)

(57) [Claims] 1. A partition wall for partitioning a box body from front to back in an airtight manner,
The equipment room is provided on one side of the partition wall, setting a bus chamber on the other side
In the case of a metal-closed metal switchgear, the equipment room includes:
Vacuum circuit breaker housed in multiple stages on one side and provided on the other side
Provided an operating mechanism for inputting and off the vacuum circuit breaker, the bus chamber, Tatehaha connected to a vacuum circuit breaker of the equipment room
Wire and movable side are connected and fixed to the vacuum circuit breaker in the equipment room
Side is connected to the vertical bus and
And a disconnector to be cut, metal enclosed type switchgear, wherein the this <br/> an insulating gas is sealed. 2. A front partition and a rear partitioning the box body airtightly back and forth.
A partition between the front partition and the rear partition.
Line chambers are provided, each outside the front partition and the rear partition.
The metal-closed switchgear according to claim 1, wherein the equipment room is provided . 3. An upper terminal of a vacuum valve of the vacuum circuit breaker.
Connect the movable side of the disconnector to the rear end of the vacuum circuit breaker.
A connection electrode is formed at the front end of the lower terminal of the
Lube, upper terminal, lower terminal and the connection electrode with insulating resin
2. The method according to claim 1, wherein said cover is integrally molded.
Item 3. A metal-closed switchgear according to Item 2 .