JPS6029285Y2 - Support insulating components for gas insulated equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a supporting insulating member for gas insulated equipment, and more particularly to an improvement in the fixing structure of a supporting insulating member made of a cast insulating member for supporting a voltage applying section.

In conventional gas-insulated, for example, SF6 gas-insulated equipment, the live parts to which voltage is applied are a conductor 1 and a metal member, such as a flange 2, as shown in FIG.
6 and gas 3 are housed in a grounded tank 4 and insulated from each other.

When supporting and fixing the flange 2 to the ground tank 4, a supporting insulating member such as epoxy resin is used as a supporting insulating member, but in the illustration, an insulating tube 5 is used.

Conventionally, as shown in FIG. 2, the method of fixing the insulating tube 5 is to embed a bushing 6 with a threaded portion inside the insulating tube along its circumference during casting, and form an integral structure with the insulating tube. 6 is used to fix the flange 2 to the insulating tube 5 with bolts 7.

According to such a conventional structure, the corner portion of the flange 2 where the bushing 6 does not exist, that is, the portion indicated by the arrow 44 B 99 in FIG. The electric field is extremely large only in the part shown in , and when voltage is applied, the above part, that is, the inner part of the flange 2
A flashover may occur between the corner "B" in the area indicated by "D" and the grounded tank 4.

This electric field concentration indicates that the shielding effect of the bush 6 is insufficient, and a ring-shaped shield 8 is required to prevent this.

In addition, since the bushing 6 is embedded and cast inside the insulating tube 5, the thermal expansion coefficients of the cast insulating material such as epoxy resin and the metal bushing are different, so the effects of temperature changes are large, and the bonding of the bushings due to heat cycles is difficult. There is a risk that parts may come off or the insulation tube may be damaged.

Alternatively, there is a problem that residual strain may remain in the epoxy resin when it is cured.

The purpose of the present invention was made in view of the above points, and is to provide a supporting insulating member for gas insulated equipment that can improve the withstand voltage performance of the supporting insulating member that supports and fixes live parts. .

Hereinafter, the present invention will be explained with reference to the embodiments shown in FIGS. 4 to 6.

The same parts as in FIGS. 1 and 2 are given the same reference numerals.

As shown in FIG. 4, the supporting insulating member 9 has a cylindrical body and flanges at both ends, and the flange 11 is injected with epoxy resin or the like, with holes provided on the circumference for passing bolts. It is shaped.

A ring-shaped shield 10 made of metal and having a U-shaped cross section is provided at a position facing the flange 2 of the live part, and this shield 10 is provided with a threaded portion 10a on the circumference as shown in FIG.

In FIG. 4, the flange portion 10a of the supporting insulating member 10 is sandwiched between the ring-shaped shield 10 and the flange 2, and the bolt 7 is screwed into the threaded portion 10a of the shield 10 through the flange 2 and the flange portion 11. There is.

Further, as shown in FIG. 6, the other support insulating member 9 is similarly fixed to the fixing member 13.

As described above, according to the present invention, the supporting insulating member is not embedded in the bush during casting, and is tightened and fixed via the metal ring-shaped shield with a U-shaped cross section when bolting. The applied force can be evenly applied to the flange portion of the supporting insulating member.

Furthermore, since no embedded bushing is required, there is no need to consider residual strain stress due to casting, and the durability of the supporting insulating member against heat cycles can be improved.

Furthermore, since the ring-shaped shield has a U-shaped cross-section and is rounded at one end, it has a shielding effect and can uniformly relieve the electric field at the end of the flange of the supporting insulating member, so it is not necessary to use a It is possible to provide a support insulating member for gas insulated equipment that can improve withstand voltage performance without the need to provide a special shield.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a support insulating cylinder of a conventional gas insulated equipment, Fig. 2 is a sectional view showing the main parts of a conventional supporting insulating cylinder, and Fig.
The figure is a plan view taken along the line ■-■ in FIG. 2, FIG. 4 is a cross-sectional view showing the main parts of the supporting insulating member of the gas insulated equipment of the present invention, and FIG. 5 is a plan view taken along the line ■-■ in FIG. The plan view and FIG. 6 are cross-sectional views showing the gas insulated equipment supporting insulating member of the present invention. 2...Flange, 3...Insulating gas, 4
...Grounding tank, 9...Supporting insulating member, 10...Ring-shaped shield ring, 11...
...Flange of supporting insulating member, 13...Fixing member.

Claims (1)

[Scope of utility model registration request] In a supporting insulating member for attaching a live part of gas insulated equipment to a supporting or fixing member, a flange part provided integrally with the supporting insulating member is connected to a ring-shaped part having a U-shaped cross section with a metal mounting member provided on the live part or fixing part. and the ring-shaped shield, and are tightened via a tightening member provided through a screw portion provided along the circumference on the ring-shaped shield, the metal mounting member, and the flange of the support insulating member. A support insulating member for gas insulated equipment, characterized in that it is fixed.