JP2950424B2 - Main circuit disconnection of gas insulated switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Industrial application field) The present invention relates to a main circuit disconnecting portion used in a gas insulated switchgear.

(Prior Art) In FIG. 3 showing an example of a conventional gas insulated switchgear, a metal partition for partitioning the box 1 forward and backward is provided at a front portion inside a metal box 1 whose outer periphery is sealed. A wall 1a is provided, and a circuit breaker 3 is housed in a circuit breaker room 2 in front of the partition wall 1a.

In addition, sulfur hexafluoride gas is sealed at substantially the atmospheric pressure in the rear part of the partition wall 1a, and a disconnector 4A is mounted in front of the ceiling part. The bus bar 5 penetrating through the base 6 is attached to the mounting base 6 through the insulator 6a.

Further, a disconnector 4B is attached to the front of the floor, and a cable head 7 to which a cable (not shown) that rises from below the floor is connected.

The front poles of the disconnectors 4A and 4B are connected to upper and lower poles of the circuit breaker 3 via main conductor disconnecting portions 9 described later provided on the connecting conductor 8 and the partition wall 1a. The pole is on bus 5,
The rear pole of the disconnector 4B is connected to the upper end of the cable head 7 by a conductor 8, respectively, and a gas insulating spacer (not shown) is attached to the side wall of the box 1 through which the bus 5 passes.

FIG. 4 is a detailed longitudinal section of the main circuit disconnecting section 9. In FIG. 4, the main circuit disconnecting portion 9 is a T-shaped circuit comprising a center conductor 11 attached to a mounting plate 10 provided on a side wall 1a by a fixture 13 and penetrating back and forth at the center and an epoxy resin cast insulating pair 12a. A pusher 12, a plurality of fingers 15 attached to the front end of the center conductor 11 via a coil spring 15a, and a sheet metal shield ring attached to the center conductor 11 so as to cover the fingers 15.
O-ring 14 provided between the mounting plate 10 and the insulating pair 12a.
The inner periphery 10b of the mounting plate 10 is chamfered in a semicircle.

(Problems to be Solved by the Invention) However, in the main circuit disconnecting portion 9 of the gas switchgear having such a configuration, when the rated current of the main circuit increases, the number of the fingers 15 increases, and the coil spring 15a also increases to increase the seeding. 16
Becomes large. Further, as the rated voltage of the main circuit increases, the outer diameter of the seed ring 16 increases, and accordingly, the through hole 10a of the mounting plate 10 also increases.

As a result, when the shield ring 16 is large, not only is manufacturing difficult, but when the weight increases, the outer surface may be damaged at the time of transportation or assembly and the withstand voltage value may be reduced. As the diameter of the through hole 10a of the mounting plate 10 increases, the inter-phase dimension also increases.

Then, the dimensions of the switchgear in the front-rear direction and the left-right direction increase, and the characteristics of the gas-insulated switchgear aiming at reducing the installation floor surface are impaired.

Therefore, an object of the present invention is to obtain a main circuit disconnecting portion of a gas insulated switchgear capable of reducing the outer diameter of the gas insulated switchgear.

[Structure of the Invention] (Means and Action for Solving the Problems) The present invention is provided on a partition partitioning the inside of the box, and is provided on one side of the partition in an insulator fixed to a mounting portion provided on the partition. A connection part of an electric device housed so as to be able to be drawn out is freely connected to and separated from the other end of a connection conductor to which one end is connected to another electric device arranged on the other side of the partition wall in which the insulating gas is sealed. In the main circuit disconnecting portion of the gas insulated switchgear, a central conductor buried in an insulator and provided with openings at both ends, and an electric field relaxation portion formed in a substantially semicircular shape on the outer peripheral edge of the opening of the central conductor And a contact portion provided inside the electric field alleviating portion and having a contact portion where the other end of the connection conductor inserted from one side and a connection portion of the electric conductor inserted from the other side are provided. Gas-insulated switchgear with improved withstand voltage characteristics between the bulkheads and a smaller external shape of the switchgear A main circuit disconnector of location.

(Embodiment) Hereinafter, an embodiment of a disconnecting portion of the gas insulated switchgear of the present invention will be described with reference to the drawings. However, portions overlapping with those in FIGS. 3 and 4 are omitted.

FIG. 1 is a vertical cross-sectional view for explaining a main circuit disconnecting portion of the gas insulated switchgear of the present invention.

In FIG. 1, a substantially T-molded epoxy resin is used.
At the left end of the center conductor 17 in the insulator 18 having a shape, an electric field relaxation portion 17a having a cross section with the opening side on the left side is provided, and the inside of the opening side end of the electric field relaxation portion 17a has two steps. The outer peripheral end 17b is chamfered in a semicircle.

In addition, a groove 17c having a semicircular cross section is provided over the entire circumference on the outer periphery of the cylindrical portion at the left end center of the center conductor 17, and the grooves 17c are provided with a plurality of fingers attached to the outer circumference of the cylindrical portion. The semi-circular contact part that fits into the rear end of the
A coil spring 15a is wound around each of the semicircular concave portions provided on the front and rear outside of the coil 15.

In the disconnecting portion of the gas insulated switchgear having such a configuration, the finger 15 which becomes the maximum electric field portion between the mounting plate 10 and the ground potential is provided.
The outer edge of the insulator 18 and the electric field relaxation portion 17a is the outer edge 17b.
Is relaxed.

Moreover, the connection with the circuit breaker 3 is made by the center conductor in the insulator 18.
17 and the cylindrical contact portion of the circuit breaker 3 is connected directly (without passing through the shield ring 16 as in the conventional case) within the center conductor 17 in the insulator 18 so that the circuit breaker 3 and the mounting plate 10 Not only can the gap be reduced, but also because the shield ring is not required, the structure is simple and the assembly is easy, and the depth and width of the gas insulated switchgear can be reduced.

FIG. 2 is a longitudinal sectional view showing one embodiment of a main circuit disconnecting portion of the gas insulated switchgear of the present invention.

In FIG. 2, the insulator 20 has a vertical cross section having a substantially cross shape, and a right and left symmetrical central conductor 19 is embedded in a cylindrical portion projecting right and left. A cylindrical electric field relaxation portion 19b is provided on the outer periphery of the electric field relaxation portion 19b. A groove 19c is formed, and a plurality of fingers are formed in the groove 19c.
The coil springs 15a are wound around the fingers 15, respectively.

The outer periphery of the insulator 20 is fixed to the mounting plate 10 by an annular holding plate 21 and a fastener 13.

In the main circuit disconnecting portion of the gas insulated switchgear having such a configuration, the distance between the circuit breaker 3 and the mounting plate 10 can be shortened in the same manner as in FIG. 1, and a main circuit device behind the mounting plate 10 (for example, a disconnector) Can be shortened by connecting the front end of the connection conductor within the center conductor 19 of the insulating layer 20, so that the depth of the gas insulated switchgear can be further reduced, and the connection conductor 8
The connection between the main circuit disconnecting portion and the main circuit disconnecting portion only requires the insertion of the connection conductor 8, so that the assembling becomes easy.

[Effects of the Invention] As described above, according to the present invention, electric power is provided on one side of a partition wall in an insulator provided on a partition wall for partitioning the inside of the box and fixed to a mounting portion provided on the partition wall. Main circuit of a gas-insulated switchgear that allows the connection part of the device and the other end of the connection conductor to which one end is connected to another electric device disposed on the other side of the partition wall in which the insulating gas is sealed to be separated. In the disconnecting section,
A center conductor buried in the insulator and provided with openings at both ends, an electric field relaxation portion formed in a substantially semicircular shape on the outer peripheral edge of the opening of the center conductor, and provided inside the electric field relaxation portion, The withstand voltage between the bulkhead and the main circuit disconnecting portion is increased by providing a contact portion where the connection portion of the electric device inserted from one side and the other end of the connection conductor inserted from the other side are increased, so that the bulkhead and the main circuit are disconnected. The main circuit disconnecting portion of the gas insulated switchgear can be obtained in which the distance between the electric devices connected to the disconnecting portion can be reduced and the outer shape can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view for explaining a main circuit disconnecting portion of the gas insulated switchgear of the present invention, and FIG. 2 shows an embodiment of a main circuit disconnecting portion of the gas insulated switchgear of the present invention. FIG. 3 is a side view of a conventional gas insulated switchgear, and FIG. 4 is a longitudinal sectional view showing details of a main circuit disconnecting section 9 in FIG. 3. Circuit breaker 10 ... Mounting plate attached to partition 17 ... Central conductor 18 ... Insulator

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Nobuo Masaki, Inventor No. 1, Toshiba-cho, Fuchu-shi, Tokyo Inside the Toshiba Fuchu Plant (56) References 33611 (JP, U)

Claims (1)

(57) [Claims] A connection portion for an electric device, which is provided on a partition partitioning the inside of the box and fixed to a mounting portion provided on the partition, and which is retractably housed on one side of the partition,
In the main circuit disconnecting portion of the gas insulated switchgear, which allows the other end of the connection conductor to which one end is connected to another electrical device disposed on the other side of the partition wall in which the insulating gas is sealed, A center conductor buried in an insulator and provided with openings at both ends; an electric field relaxation portion formed in a substantially semicircular shape at an outer peripheral edge of the opening of the center conductor; provided inside the electric field relaxation portion A main circuit disconnecting portion of the gas insulated switchgear, comprising: a contact portion for contacting the connection portion of the electric device inserted from one side and the other end of the connection conductor inserted from the other side.