JPH0767209B2 - Gas insulated switchgear - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated switchgear, and more particularly to a support structure for a gas-insulated busbar for electric power, which is laid long on the foundation of a gas-insulated switchgear.

In general, a gas-insulated bus bar is often used mainly in a gas-insulated switchgear for connecting each functional element such as a sushi or a disconnecting unit accommodating a break or a disconnection or a disconnecting unit accommodating a disconnection. Among them, a so-called main bus which is connected to all of the switchgear groups which are respectively one group as a transmission line unit and a transformer unit is inevitably long.

Such a main bus line laid on the foundation changes temperature due to the influence of electricity and the environment. Similarly, a temperature change occurs in the foundation itself, but generally, the gas-insulated bus bar thermally expands due to the heat generated when energized or the influence of direct sunlight, and the expansion / contraction amount due to the heat is larger than that of the foundation due to the difference in expansion coefficient. For this reason, near both ends of the long main bus, the equipment installed on the foundation is mechanically adversely affected by the thermal expansion and contraction of the main bus,
This becomes remarkable as the main bus bar is made longer.

Conventionally, the following structural examples have been provided as measures to solve this point. FIGS. 1 and 2 show an example of the configuration of a conventional gas-insulated switchgear, in which a cable breaker 1 installed on a foundation is connected to a cable head 4 for line input / output through a current transformer 2 and a connecting busbar 3. And a circuit connected to the main bus 6 via the current transformer 2 and the disconnector 5. In such a switchgear group, as shown in FIG. 2, the main busbars are supported by supporting the central busses near the center of the main busbars divided for each unit from below using the fixing base 10. It is installed and fixed at the point. The main busbars 6 are connected by expansion joints 7 such as bellows, and the ends 9 of the tie rods 8 are movable in order to escape thermal expansion and contraction. As shown in FIG. 3 for details of the movable structure, the double nut 14 screwed into the tie rod 8 has a gap A, B in both the flange portion 17 of the expansion joint 7 and the flange portion 16 of the bus bar 6. Each of them is made to have heat expansion and contraction.

In the conventional structure as described above, a drawback is the cantilever structure of the fixing base 10 shown in FIG. That is, the body plate portion of the bus bar 6, which is a pressure vessel that generally receives gas pressure F of several tens of tons, is fixed to the foundation base 11 through the fixing base 10.
Since it is bolted with the bolt 12, there is a drawback that a large-scale reinforcing device 13 is required.

The present invention has been made in view of the above, and an object thereof is to provide a rational gas-insulated switchgear which does not require extra reinforcement on the trunk plate of the busbar. Providing strong fixing bases near the ends, joining the flanges or end plates of the metal containers at both ends to the foundation base buried in the ground, and supporting the axial reaction force due to the enclosed gas pressure with the fixing bases. The characteristic gas-insulated switchgear is provided.

The present invention will be described below with reference to the illustrated embodiments.

As shown in FIGS. 4 and 5, in the present invention, a strong fixing base 15 is arranged near the both ends on the axial extension of the bus bar 6 so as to oppose the axial gas pressure F exerted on the bus bar 6. , Is fixed to the foundation base 18 with bolts 19. The flanges or end plates of the metal container at both ends of the bus bar 6 may be joined to the foundation base buried in the ground, or may be joined to the strong fixing base 15 itself. In the gas-insulated switchgear according to the present invention shown in FIGS. 4 and 5, the above-mentioned other structural arrangements are the same as those of the conventional device shown in FIGS. 1-3, and therefore, the same or corresponding members are designated by the same reference numerals, The description is omitted.

According to the present invention, with the above-mentioned configuration, no extra reinforcement is required for the trunk plate of the bus bar, and therefore, there is an effect that a rational gas insulated switchgear can be obtained.

[Brief description of drawings]

FIG. 1 is a front view showing an example of a conventional gas-insulated switchgear,
2 is a partial side view of the busbar portion taken along the line II-II in FIG. 1, FIG. 3 is a detailed partial cross-sectional view showing a movable connection of the busbar, and FIG. 4 is one example of a gas-insulated switchgear according to the present invention. FIG. 5 is a front view showing an embodiment, and FIG. 5 is a partial side view taken along the line VV in FIG. 1 ... Shiya breaker, 2 ... Current transformer, 3 ... Joint bus, 4 ...
… Cable head, 5 …… Disconnector, 6 …… Main bus, 7…
… Expansion joint, 8 …… Tyrod, 9 …… Tyrod end, 10 …… Fixing base, 11 …… Foundation base, 12 …… Bolt,
13 …… Reinforcing device, 14 …… Double nut, 15 …… Fixing stand,
16,17 …… Flange part, 18 …… Foundation base, 19 …… Bolt. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] 1. A gas-insulated bus bar, which has a metal container in which an insulating high-pressure gas is sealed, is linearly connected in a length unit through a metal expansion joint, is elongated, and is laid on the ground. In a gas-insulated switchgear having, a strong fixing base is provided near both ends on the elongated bus bar axis extension, and a flange or end plate of the metal container at the both ends and a base base buried in the ground are provided. A gas-insulated switchgear characterized by being joined together and supporting an axial reaction force due to the enclosed gas pressure with the fixing base. 2. The gas according to claim 1, wherein the strong fixing base is joined to the flanges or end plates of the metal containers at both ends and a member of a frame separately provided. Insulation switchgear.