JPH0613564Y2 - Gas insulated switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of Invention] (Field of Industrial Application) The present invention relates to a gas-insulated switchgear, and more particularly to improvement of an insulating spacer portion for supporting a conductor.

(Prior Art) Currently, a gas-insulated switchgear is often used as a switch for transmission and transformation, and is also applied to a switchgear with high voltage and large capacity from 72 KV to 550 KV. The SF6 gas used as the insulating medium of such a gas insulated switchgear has an extremely high insulating performance, but when it becomes 300 KV class or even 550 KV class, the diameter of the metal tank for enclosing the insulating gas becomes large. As the transmission voltage of the gas insulated switchgear increases, the insulation distance in the gas also needs to be increased and it becomes larger, but in order to reduce this, the main bus is separated from each phase into a three-phase batch type. With the configuration, we are trying to reduce the size. By the way, this type of gas-insulated switchgear uses SF6 gas as the insulating medium, but normally uses epoxy resin cast insulating spacers to support the inner conductor from the metal tank. For low voltage class, 3
Three conductors in the phase busbar are supported by one three-phase insulating spacer, but 300KV class, further 550KV class,
Then, if it is more than that, the diameter of the three-phase bus bar becomes large, and it is extremely difficult at present to manufacture an insulating spacer having such a large diameter due to manufacturing technology. In addition, even if it is possible to manufacture a large-diameter insulating spacer, a large differential pressure is generated during evacuation of adjacent gas sections or gas filling, and a very large proof strength is required in terms of mechanical strength. It is unsuitable for gas-insulated switchgear in terms of quality assurance. For this reason, conventionally, three single-phase type small-diameter insulating spacers are attached to a metal plate, and these are attached to a flange of a three-phase bus bar to support the inner conductor.

An example of such a conventional bus-integrated gas-insulated switchgear in which a conventional three-phase main busbar and a switchgear are integrally formed is shown in FIG. Disc-shaped metal plates 2 are attached to both ends of a main body tank 1 in which the main body of the switchgear is housed, and three single-phase insulating spacers 3 are mounted on the switchgear side of the metal plate 2.
The conductor 4 and the conductor 5 are attached by the insulating spacer 3. As shown in FIG. 7, the insulating souce 3 is fixed to the inside of the opening 2a of the metal plate 2, that is, the inside of the mounting portion 3a of the insulating spacer 3 to the main body tank 1 side, and is fixed with the screw 6. . Further, the metal plate 2 is sandwiched between the flange of the main body tank 1 and the flange of the three-phase main bus tank 7, and is fixed by the screw 8.

On the other hand, three branch outlets 9 are provided above the main body tank 1, and an opening / closing device section 10 is connected to each of them.
The opening / closing device section 10 is composed of a movable side conductor 11, a fixed side contact portion 12 and a movable contactor 13. The movable contactor 13 has a connecting ring 15, an opening / closing mechanism 16 and an insulating operating rod 17 by an operating device 14 provided outside. It is opened and closed via. Also,
The fixed-side contact portion 12 is fixed to a branch conductor 19 supported by the main body tank 1 via an insulating cylinder 18.

By the way, the inner diameter of the main body tank 1 of the busbar-integrated gas-insulated switchgear configured as described above has three insulating spacers 3
Since there is no choice but to make the diameter of the cylinder inclusive, the diameter becomes ΦD1 shown in FIG. The total height of the busbar-integrated gas-insulated switchgear having such a main busbar configuration is H1. This is the sum of the required height of the switchgear unit 10 and the length of the branch passage 20 for mounting the insulating cylinder 18, in addition to the main bus diameter ΦD1, but is also manufactured as a tank branch. There is a required length for the upper and pressure vessels, and it cannot be made shorter than this.

(Problems to be solved by the invention) By the way, in the above gas-insulated switchgear, the height H1 of the switchgear is not only difficult to handle during production,
It is important because it is related to transportation restrictions or the size of the machine hatch. If any of these restrictions is exceeded, it will not be possible to transport or carry in, and the equipment will have to be split to carry it to the installation site. As a result, the tank inside is transported to the atmosphere, and the switchgear unit 10 is combined on site to maintain the assembly quality at the factory with respect to the basic performance such as insulation performance and opening / closing performance of the equipment. It gets harder. Also, the verification test for quality confirmation is not sufficient because the factory test equipment cannot be used in the final assembled state.

The purpose of the present invention is to solve the above-mentioned conventional problems,
An object of the present invention is to provide a highly reliable gas-insulated switchgear which has a simple structure and can be reduced in overall height H as a switchgear, which can be transported and installed in the entire assembled state.

[Construction of the Invention] (Means for Solving Problems) The present invention is a three-phase batch type switchgear main body in which opening / closing means for three phases is enclosed in a tank, and a conductor for three phases inside the tank. And a main bus bar of a three-phase package that accommodates the tank, the diameter of the tank of the switchgear body is smaller than the diameter of the tank of the main bus, and the connecting portion of both tanks is located outside the tank. Form expanded flanges respectively, sandwich the disk-shaped metal plate between the flanges of both tanks, connect both tanks, and attach three single-phase insulating spacers to this metal tank. In a gas-insulated switchgear supporting a three-phase conductor by means of one side of a disk-shaped metal plate is fixed to the flange of the main bus bar tank at its outer peripheral edge, and the main bus bar is on the opposite side of the disk-shaped metal plate. From the flange fixing part of the tank Also, fix the flange of the switchgear body tank to the position on the center side, on the same side as the flange fixing part of the main bus bar tank in the disk-shaped metal plate, and on the position closer to the center than the flange fixing part of the main bus bar tank. Is characterized in that the outer peripheral edge portions of the three insulating spacers are fixed so as to face the flange fixing portion of the switchgear body tank located on the opposite surface of the metal plate.

(Operation) As described above, in the present invention, the flange of the main body tank, the flange of the main bus bar tank, and the outer peripheral edge of the insulating spacer are arranged on both sides of the metal plate in a concentrated manner.
It is possible to reduce the diameter of the main tank of the switch while securing a sufficient space for installing the insulating spacers for the phases. As a result, the height of the entire switchgear can be reduced.

(Embodiment) Next, one embodiment of the gas-insulated switchgear of the present invention will be described with reference to FIG.

The same parts as those of the conventional technique are designated by the same reference numerals and the description thereof will be omitted.

* Structure of Embodiment * In FIG. 1, one side of a disk-shaped metal plate 2 is fixed to the flange of the main bus bar tank 7 at its outer peripheral edge, and the main bus bar is provided on the opposite side of the disk-shaped metal plate 2. The switchgear body tank 32 is located at a position closer to the center than the flange fixing portion of the tank 7.
The flange of is fixed with screws 31. The disk-shaped metal plate 2 is located on the same side as the flange fixing portion of the main bus bar tank 7 and on the opposite side of the metal plate 2 at a position closer to the center than the flange fixing portion of the main bus bar tank 7. Facing the flange fixing portion of the switchgear body tank 32, the mounting portions 3a of the outer peripheral edges of the three insulating spacers 3 are screwed into the screw 3
Fix by 3. As a result, in this embodiment, the mounting portion 3a of the insulating spacer 3 is provided outside the main body tank 32, that is, outside the opening 2a of the metal plate 2, and the outer surface of the mounting portion 3a is superposed on the outer surface of the metal plate. It is fixed. On the other hand, the conductor supporting portion 3b of the insulating spacer 3 is not
It is provided inward. That is, the insulating spacer 3 is formed in a trumpet shape by making the diameter of the conductor supporting portion 3b smaller than the mounting portion diameter 3a, and the conductor supporting portion 3b having a small diameter.
The diameter of the main body tank 32 including only the above portion may be smaller than the diameter of the conventional main body tank.

* Operation of the Embodiment * According to the gas-insulated switchgear of this embodiment having such a configuration, the inner diameter of the main body tank 32 is reduced as compared with the conventional inner diameter .PHI.D1 as shown in FIG. 2 and FIG. be able to. That is, since the inner diameter ΦD2 of the main body tank 32 including only the conductor support portion 3b is smaller than the minimum tank inner diameter ΦD1 that includes the mounting portions 3a of the three insulating souces 3, the inner diameter can be reduced accordingly. This inner diameter ΦD2 can be minimized when the arrangement of the three insulating spacers 3 is a substantially equilateral triangle arrangement.

In this way, by reducing the inner diameter of the main body tank 32, the height H2 of the entire opening / closing device is smaller than the conventional height H1 by the inner diameter of the main body tank 32, that is, the inner diameter difference (ΦD1
-ΦD2) can be lowered.

* Effects of the embodiment * As described above, in the gas insulated switchgear of this embodiment,
Since the inner diameter of the main body tank 32 could be reduced,
As equipment grows in size, keep it within the transportation limit height,
Furthermore, it is extremely effective in keeping the height of the machine hatch within the limit, and it is possible to transport, carry in, and install in a completely assembled state as shown in FIG. This means that the gas insulated switchgear with extremely high reliability can be used as it is without being disassembled in a completely assembled state in the factory and whose quality has been checked such as operation test and withstand voltage test without disassembling. The device can be obtained.

* Other Embodiments * The present invention is not limited to the above embodiments,
An opening / closing device in which the main body tank 1 and the opening / closing device section 10 are separated by an insulating spacer 21 as shown in the figure are also possible.

[Advantages of the Invention] As described above, according to the present invention, the inner diameter of the main body tank of the busbar integrated switchgear is reduced without impairing the equipment performance of the gas-insulated switchgear. It is possible to provide a highly reliable gas-insulated switchgear that can be transported and installed in a fully assembled state by reducing the size.

[Brief description of drawings]

FIG. 1 is an enlarged view of a main busbar connecting portion of a gas insulated switchgear showing an embodiment of the present invention, FIG. 2 is a configuration diagram of the gas insulated switchgear of the present invention, and FIG. 3 is a gas insulated switchgear of the present invention. FIG. 4 is a side view of the busbar side of FIG. 4, FIG. 4 is a configuration diagram showing another embodiment of the gas insulated switchgear of the present invention, FIG. 5 is a configuration diagram of a conventional gas insulated switchgear, and FIG. 6 is a conventional gas insulated switchgear FIG. 7 is a side view of a busbar portion of the switchgear, and FIG. 7 is an enlarged view of a main busbar connecting portion of a conventional gas-insulated switchgear. 1 ... main body tank, 2 ... metal plate, 2a ... opening, 3
...... Insulation spacer, 3a ...... Mounting part, 3b ...... Conductor support part, 4,5 ...... Conductor, 6,8 ...... Screw, 7 ...... Main bus tank, 9 ...... Branch outlet, 10 ...... Switching device Part, 11 ...
... Movable side conductor, 12 ... Fixed side contact part, 13 ... Movable contactor, 14 ... Operating device, 15 ... Connection link, 16 ...
… Opening / closing mechanism, 17 …… Insulation operating rod, 18 …… Insulation cylinder, 1
9 ... Branch conductor, 20 ... Branch portion, 21 ... Insulating spacer, 31, 33 ... Screw, 32 ... Main body tank.

Claims (2)

[Scope of utility model registration request] 1. A tank in which opening / closing means for three phases is enclosed.
A phase-integrated switchgear main body and a three-phase batch-type main busbar, which also houses conductors for three phases inside the tank, are provided, and the diameter of the tank of the switchgear main body is smaller than the diameter of the main busbar tank. In addition to having a small diameter, a flange portion that expands outward of the tank is formed at the connection portion of both tanks, and a disk-shaped metal plate is sandwiched between the flanges of both tanks to connect both tanks, In a gas-insulated switchgear in which three insulating spacers are attached to this metal tank and three-phase conductors are supported by this insulating spacer, one side of a disk-shaped metal plate is fixed to the flange of the main bus tank at its outer peripheral edge. , The flange of the switchgear body tank is fixed to the surface on the opposite side of the disk-shaped metal plate at a position closer to the center than the flange fixing part of the main busbar tank, and the flange of the main busbar tank in the disk-shaped metal plate is fixed. At the position closer to the center than the flange fixing portion of the main bus tank on the same side as the fixing portion and facing the flange fixing portion of the switchgear body tank located on the opposite surface of the metal plate, the A gas-insulated switchgear characterized in that the outer peripheral edge of each insulating spacer is fixed. 2. The gas insulated switchgear according to claim 1, wherein the three insulating spacers are arranged in a substantially equilateral triangle.