JPS62110424A - Gas insulated bus bars - 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] [Technical Field of the Invention] The present invention relates to a gas insulated bus bar used in a power transmission system, and in particular, it is possible to achieve low cost and performance by improving the fixing part of an insulating spacer. This relates to gas-insulated busbars that have achieved improvements.

[Technical background of the invention and its problems] The gas insulated bus bar uses an insulating gas such as SF6 gas when i=J
A high-voltage charging conductor is housed inside a large grounded metal case, and this conductor is supported by a ladder of spacers.

The general structure of such a gas-insulated 1U wire is shown in Figures 3 to 5.
As shown in the figure.

First, in FIG. 3, a high-voltage charging conductor 3 is inserted and distributed in a grounded metal case 2 insulated by an insulating gas 1, and this high-voltage charging conductor 3 is connected to an insulating spacer fixed to the inner surface of the grounded metal case 2. 4, and insulating spanners 5a, 5b, etc., which are slidable in the axial direction of the grounded metal case 2.

In the gas insulated busbar having such a configuration, the insulating spacer 4 fixed to the inner surface of the grounded metal case 2 has three legs as shown in FIG. It is fixed to the grounded metal case 2.

FIG. 5 shows details of the fixing portion 6 between the legs of the insulating spacer 4 and the grounded metal case 2 in FIG. 4.

In FIG. 5, a metal fixed support structure 7 is provided at the end of the leg of the insulating spacer 4, and this metal fixed support structure 7 is supported by a fixation seat 8 provided on the grounded metal case 2. It is fixed in a way that it is surrounded by a certain gap. Further, a dome-shaped grounding contact 7 for grounding to the grounding metal case 2 is provided at the tip of the metal fixed support structure 7.
A is provided.

By the way, as for the material of the ground metal case 2 used for the gas-insulated busbar as described above, it is preferable to use an inexpensive material such as steel from the viewpoint of manufacturing cost. J31 for problems and grounding. Conventionally, only expensive materials such as SUS or aluminum could be used due to the following drawbacks. That is, if the current rating is large, for example 40
In busbars such as 00Δ/8000A, the magnetic field induced by the passing current is large, so if a steel-based magnetic material is used for the case, there will be a lot of heat M due to hysteresis loss, etc., and there is a high risk of higher temperatures. Therefore, in order to prevent such problems, it is necessary to use a non-magnetic material such as SUS or Au. On the other hand, 800~120OA
? In a bus bar with a relatively low current rating of 1.7, the magnetic field induced by the passing current is small, so even if a steel-based magnetic material is used for the container. The amount of heat generated due to hysteresis loss is small, and the temperature rise at each part of the bus bar can be suppressed to within standard values.

However, even when a steel-based magnetic material is used in a bus bar with a relatively low current rating, it has been impossible to solve the problem of grounding.

In other words, while materials such as AIL and SUS are rust-free, steel-based materials require anti-rust coating, but since this anti-rust coating has insulating properties, insulating spacers cannot be used. The metal fixed support structure 7 of No. 4 cannot be reliably grounded.

Therefore, conventionally, the grounded metal case 2 of the gas-insulated m-wire is SU
They are made of expensive materials such as S or A laminated steel, resulting in extremely high costs.

[Object of the Invention] The present invention has been proposed to solve the above problems, and its purpose is to
Af14A phase 14 while the metal fixed support structure of the insulating spacer! It is an object of the present invention to provide a gas insulated bus bar that can be grounded effectively, thereby making it possible to use steel-based materials as the material for the case and significantly reducing costs.

[Summary of the Invention] In order to achieve the above object, the gas insulated bus bar of the present invention has a ground metal case made of a steel-based material, and a contact surface of the insulating spacer with the ground contact of the metal fixed support structure in the case. It is characterized by being made of rust-proof metal or having a conductive coating. With such a configuration, the metal fixed support structure is always in a good conduction state with the grounded metal case, so that the metal fixed support structure can be reliably grounded.

[Embodiments of the Invention] Hereinafter, an embodiment of a gas insulated bus bar according to the present invention will be described with reference to the drawings. In this embodiment, the same insulating spacer 4 as shown in FIG. 4 is used.

*Structure In FIG. 1, the ground metal case 10 of the gas insulated bus bar is made of an inexpensive steel-based fully bendable material, such as mild steel, with a manufacturing cost of 1-. Circular ground plates 11 made of a rust-free metal material, such as stainless steel, are provided on the inner surface of the case 10 at three locations corresponding to the legs of the insulating spacer 4, and the ground plates 11 are attached to the ground metal case 10 by welding or the like. It is integrated with.

Further, the inner surface of the ground metal case 10 other than the ground plate 11 is coated with a normal inner surface coating 12.

Fig. 2 (△) (B) is a diagram showing the Le Y narrow in the vicinity of the ground plate 11, and in this embodiment, the fixed exit is shown in Fig. 2 (B).
), the U-shaped fixing seat body 13 and the press λ
The fixing seat main body 13 is mounted on the ground plate 11 in advance. In addition, the presser metal fittings 14 &
It is constructed as an independent member, and is fastened to the fixing seat main body 13 with bolts 15. Then, by joining this presser metal fitting 14 to the fixing seat main body 13, a fixing seat is formed, and the metal fixing support structure 7 of the insulating spacer 4 is surrounded and fixed with a certain gap therebetween. It looks like this.

21; Function The function of this embodiment having the above structure is as follows.

That is, since the ground plate 11 made of impure metal is provided instead of applying an insulating anti-corrosion coating as in the conventional case, the current flow between the ground contact 7a and the ground metal case 10 can be maintained well at all times through this. The metal fixed support structure 7 can be reliably grounded. Therefore, it becomes possible to use steel-based materials such as mild steel as shown in this embodiment, and it is possible to significantly reduce the cost.

Moreover, especially in this embodiment, since the fixing seat is divided into two parts, the fixing seat main body 13 and the presser fitting 14, the metal fixing support structure 7 is By tightening the presser fitting 14 after fitting, there is also an advantage that the insulating sweeper 4 can be easily and reliably fixed.

*Other Examples It should be noted that the present invention is not limited to the above-mentioned Examples.
For example, instead of attaching a ground plate, it is also possible to apply a coating with a conductive film. Further, the steel-based metal is not limited to mild steel. Furthermore, the shape of the insulating space and the fixed seating can be selected as appropriate, and the effects of the present invention can be obtained even if the fixed seating is not necessarily divided.

[Effect of the invention] As explained above, 7. According to the present invention, by simply improving the structure by attaching a fertile metal or a conductive film to the contact surface of the ground contact in the ground metal case, it is possible to replace conventional expensive metals such as 5IJS and Al. It is now possible to manufacture the metal case using inexpensive steel-based metals instead of the conventional metal case, making it possible to provide a gas-insulated bus bar that achieves a significant cost reduction.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a ground metal nose 7- showing an embodiment of the gas insulated bus bar according to the present invention, Fig. 2 <A> is a sectional view of the main part of Fig. Figure 2 (△) X arrow view, 3rd
The figure shows an example of a conventional gas-insulated busbar.
The figure is a front view of a generally used fixed type insulating scrubber, and FIG. 5 is a sectional view of the main part of FIG. 4. 1... Insulating gas, 2, 10... Grounded metal case,
3... High voltage charging conductor, 4 + 5 a, 5 b...
・Insulating spacer, 6...fixing part, 7...metal fixed support structure, 7a...ground] 8...Fixed exit, 11...Grounding plate, 12...Inner surface coating, 1
3... Fixing seat body, 14... Holding metal fitting, 15...
·bolt. Figure 1 1゛Figure 2 (A) Figure 2 (B) ji13rlA IIi4R Figure 5

Claims (2)

[Claims] (1) A conductor is housed in a grounded metal case filled with insulating gas, this conductor is supported by an insulating spacer, and the grounded metal case side of this insulated spacer has a metal fixed support structure with a grounding contact at the tip. In the gas insulated bus bar, the metal fixed support structure is fixed so as to be surrounded by a fixing seat provided on a grounded metal case with a certain gap, the grounded metal case being made of steel. 1. A gas insulated bus bar, characterized in that the contact surface of the ground contact of the ground metal case is attached with a rust-proof metal or coated with a conductive coating. (2) The fixing seat is formed by bolting together a U-shaped fixing seat body attached to a grounded metal case and an independently provided U-shaped holding fitting. Gas insulated busbar according to scope 1.