JPS59198810A - Gas insulated switching device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] This invention relates to gas insulated switchgear.

In particular, the present invention relates to a support structure for a long gas-insulated power bus bar installed on the foundation of a gas-insulated switchgear.

Generally speaking, gas insulated busbars are often used in gas insulated switchgear primarily to connect functional elements such as a breaker unit housing a breaker and a disconnection unit housing a disconnector.

Among these, the so-called main bus bar, which connects all of the switchgear groups, each of which is a power transmission line unit, transformer unit, etc., is inevitably long.

The temperature of such a main busbar installed on the foundation changes due to the influence of electricity and the environment. Similarly, temperature changes occur in the foundation itself, but gas-insulated busbars generally expand thermally due to the heat generated when electricity is applied and the effects of direct sunlight, and due to the difference in expansion coefficients, the amount of expansion and contraction due to heat is greater than that of the foundation. For this reason, near both ends of the long main bus bar, equipment installed on the foundation is subject to negative mechanical effects as it is forcibly deformed due to thermal expansion and contraction of the main bus bar.
This becomes more noticeable as the main bus line becomes longer.

Conventionally, there have been the following five structural examples as measures to solve this problem. Figures 1 and 2 show an example of the configuration of a conventional gas-insulated switchgear, in which a breaker l installed on the foundation is connected to a line input/output cable head via a current transformer and a joint busbar 3. This circuit is connected to the main bus line AK current transformer/coco disconnector S. In such a switchgear group, the main busbar is supported by supporting the main busbar, which is divided into each unit, from below using a fixed base lθ, as shown in Fig. 2. The installation is fixed at the location where it will be installed. The main busbars 6 are connected by an expansion joint 7 such as a bellows, and the end t of the tie rod g is movable in order to escape thermal expansion and contraction. As shown in Figure 3, the details of the movable structure are as follows: K, tie rod tK screwed double nut/4
Both the 7 flange portions 1 and 16 of the generatrix A are provided with a gap B to be free from thermal expansion and contraction.

In the conventional configuration as described above, one drawback is the cantilevered structure of the fixing base io shown in FIG. That is,
The body plate of the busbar O, which is a pressure vessel that receives gas pressure F reaching several 10 tons, is bolted to the base base with IC bolts/2 via the fixing base IO, which requires a large-scale installation. There was a drawback that a reinforcement device 13 was required.

This invention has been made in view of the above, and aims to provide a rational gas-insulated switchgear that does not require extra reinforcement on the body plate of the busbar. A strong fixed stand is provided near both ends, the flanges or end plates of the metal container at both ends are joined to the foundation base buried underground, and the axial reaction force due to the pressure of the sealed gas is supported by the fixed stand. The company provides gas-insulated switchgear featuring the following characteristics.

The invention will now be described with reference to illustrative embodiments.

As shown in Figs.
Place the bolts near both ends on the shaft extension of the bus bar B so as to oppose the bolts L? to the foundation base IT. Fixed by The 7 flanges or end plates of the metal container at both ends of the bus bar 6 may be joined to a foundation base buried underground,
It may be joined to the strong fixed base/3 itself. The other configurations of the gas insulated switchgear according to the invention shown in Figs. D and 5 are the same as those of the conventional device shown in Figs.
Alternatively, equivalent members are indicated with the same reference numerals, and explanations thereof will be omitted.

According to the present invention, due to the above configuration, there is no need for extra reinforcement on the body plate of the bus bar, so there is an effect that a rational gas insulated switchgear can be obtained.

[Brief explanation of drawings]

Figure 1 is a front view showing an example of a conventional gas insulated switchgear;
Fig. 2 is a partial side view of the busbar portion taken along the line ■-■ in Fig. 1, Fig. 3 is a detailed partial cross-sectional view showing the movable connection of the busbar, and Fig. 4 is a partial side view of the bus bar portion taken along the line ■-■ in Fig. 1; FIG. 5 is a front view showing one embodiment, and FIG. 5 is a partial side view taken along line V-V in FIG. 4. l...breaker, c...current transformer, 3...joint busbar, da...
・Cable head, 5. Disconnector, 6. Main bus bar, 7.
・Expansion joint, g...tie rod. ?・・Tie rod end, 10・・Fixing base, //・・Foundation base, l・・Bolt, 13・・Reinforcement device, /l・・
Double nut, /k...fixing base, /A, /l...7
Lunge part, 1g...Foundation base, 19...Bolts. In each figure, the same reference numerals indicate the same or corresponding parts. Agent Masuo Oiwa

Claims (1)

[Claims] (1) Gas that has a gas insulated bus bar that is connected in a straight line via metal expansion joints in length units and installed on the ground, with a metal container filled with insulating high-pressure gas inside. In the insulated switchgear, a strong fixed base is provided near both ends of the elongated busbar axis length, and the seven flange or end plate of the metal container at both ends and the foundation space buried underground are provided. A gas insulated switchgear characterized in that the fixed base supports the axial reaction force caused by the pressure of the sealed gas. (g) The gas-insulated opening and closing according to claim 1, characterized in that the strong fixing base is joined to the flanges or end plates of the metal container at both ends and to a separately provided frame member. Device.