JPS6212324A - Insulation ring - 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 an insulating ring disposed at a connection point between metal containers in a gas insulated switchgear.

[Technical background of the invention and its problems]

A gas-insulated switchgear is formed by housing a live part in a metal container connected to an insulating gas such as SF,
In order to insulate and support this charging part from a grounded metal container (hereinafter abbreviated as a case), a member called an insulating spacer and an insulating ring that insulates the cases are widely used.

The conventional insulating ring has cases 1 and 2 as shown in Figure 6.
An insulating ring 3 is provided so as to be sandwiched between the respective flanges la and 2a. The insulating ring 3 is integrally formed into a ring shape by a mold member 4 with an embedded metal fitting 3a formed through the insulating ring 3. Furthermore, grooves are formed on the surfaces of the insulating rings 3 that contact the flanges la and 2a, and backings 5 such as O-rings are provided in order to maintain airtightness. Furthermore, both flanges Ia are connected by bolts 6 and 6a.
, 2a is tightened, and the SFG is inside cases 1 and 2.
An insulating gas 7 such as gas is sealed.

In gas insulated switchgear, there may be cases where it is desired to electrically disconnect between cases 1 and 2 using an insulating ring 3 due to the grounding type or other factors. flange 1a
Insulation of the cases 1 and 2 is ensured by ensuring that the cases 1 and 2 do not come into contact with each other.

However, in such a conventional structure, the number of parts increases, the structure becomes complicated, and the bolt 6 must be tightened with less than the normal tightening torque to avoid damaging the insulating washer 8a provided between the bolt 6 and the flange 18. In addition, the insulating washer 8a and insulating sleeve 8b, which are manufactured by impregnating a laminated member such as glass cloth with epoxy resin, are somewhat hygroscopic, and if exposed to the air, insulation may deteriorate and there may be concerns about weather resistance. There were problems such as lack of reliability.

[Purpose of the invention]

The present invention has been made in consideration of the above points.

The objective is to provide a reliable insulating ring that can easily insulate between metal containers.

[Summary of the invention]

According to the present invention, this object is achieved.

Embedded fittings that are formed to be sandwiched between the flanges of a metal container and screwed to the flange sections are provided individually from both sides, and molded into a ring shape so as to maintain insulation between the opposing embedded fittings. By molding through an insulating member, a metal container can be easily insulated and joined, and a reliable insulating ring is provided.

[Embodiments of the invention]

An embodiment of the insulating ring of the present invention will be described below with reference to FIG. A gas insulated switchgear houses a live part in a metal container, the metal container is joined via an insulating spacer or an insulating ring, and an insulating gas such as SF or gas is sealed inside the metal container.

The insulating ring 10 is formed into a ring shape by individually embedding metal fittings 12 and 13 into the molded insulating member 11 from both sides. Additionally, grooves are formed on the sides of the metal containers 15 and 16 (hereinafter abbreviated as cases) that contact the surfaces of the flanges 15a and 16a, and backings 17 such as O-rings are housed in these grooves to maintain airtightness. . SF is inside the case 15 and 16 connected in this way.

An insulating gas 10a such as gas is sealed.

Further, the embedded fittings 12.13 are formed to have an effective thread length necessary for screw fastening to the flanges 15a, 16a of the case 15.16. The embedded fittings 12 and 13 are opened on the flange 15a and 16a sides, respectively.
It is shaped like a cap nut with the other side closed.

Further, at the time of being molded by the mold insulating member 11, the respective closed end surfaces of the embedded fittings 12.13 are molded to face each other, and the opposing embedded fittings 12.1
A gap between the three molded insulating members 11, that is, an insulating member layer 11a is formed. Also case 15.16
Insulating ring 10 is sandwiched between flanges 15a and 16a of
Fasten with bolts 18 and 19, respectively.

Next, the effects of the present invention will be explained. By sandwiching the insulating ring 10 constructed in this manner between the flanges 15a and 16a of the case 15.16 and fastening them with bolts 18.19, the current-carrying path is insulated by the insulating member layer 11a. In other words, one energizing path is the bolt 18 of the case 15. Embedded metal fittings 12. Insulating member layer 11a.

Embedded metal fittings 13. Bolt 19. The case 16 is formed, and the insulating material layer 11 is placed between the embedded fittings 12 and 13 as described above.
Because of the presence of case 15 and 16, insulation is provided between cases 15 and 16.

Therefore, it is not necessary to use insulating collars, insulating sleeves, etc. for insulating bolts as in the conventional case, and the number of parts can be reduced. Furthermore, there is no risk of deterioration in insulation due to moisture absorption or weather resistance.

Furthermore, a first alternative embodiment of the present invention will be described next with reference to FIG. 2, in which the same parts as in FIG. 1 are given the same reference numerals.

That is, by forming the opposing closed ends of the embedded fittings 21 and 22 into a spherical shape, the electric field in the insulating member layer 11b between them is relaxed, so that the electric field in the insulating member layer 11b in the embodiment of the present invention The insulating member layer 11b can be made smaller.

Next, a second other embodiment of the present invention will be described in FIGS. 3 to 5.
This will be explained with reference to the figures. The same parts as in FIG. 1 are given the same reference numerals. The embedded fittings 23, 25 are arranged opposite each other but in a staggered manner.

In other words, the distance between the embedded fittings 23 and 25 is approximately the same as that of the insulating member 1.
It is formed to have an insulating distance of 1c and an insulating member layer lid between the tips of each of the embedded fittings 23 and 25. By arranging the embedded fittings 23, 25 alternately in this manner, the thickness D of the insulating flange 10 can be made thinner than in the embodiment of the present invention.

〔Effect of the invention〕

As explained above, according to the present invention, separate embedded metal fittings are provided on both sides sandwiched by the flange and are opposed to each other, and an insulating member layer made of a molded insulating member is provided between the closed tip portions of the mutually opposed embedded metal fittings. By forming an insulating flange, it is possible to insulate between metal containers to be joined, and there is no need to insulate bolts as in the past, reducing the number of parts and improving insulation reliability. can.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an insulating ring of the present invention, FIG. 2 is a sectional view of a first alternative embodiment of the invention, and FIG. 3 is a sectional view of a second alternative embodiment of the invention. Figure 4 is a sectional view taken along the line IV-IV in Figure 3, Figure 5 is a sectional view taken along the line ■-V in Figure 3, and Figure 6
The figure is a cross-sectional view of a conventional insulating ring. 10... Insulating ring, 10a... Insulating gas,
11...Mold insulation member. 11a, llb, llc, 1ld - insulation member layers. 12.13...Embedded metal fittings. 15.16...Metal container (case), 15a, 16a
...flange, 17...backing. 18.19... Bolt, 21.22, 23, 25... Embedded metal fitting, D... Thickness of insulation flange,

Claims (3)

[Claims] (1) In an insulating ring that insulates between grounded metal containers of a gas-insulated switchgear, an embedded fitting that is screwed to the flange of the grounded metal container is integrally molded with a molded insulating member, and the embedded fitting is screwed to the flange of the grounded metal container. The metal container has an effective screw length necessary for fastening, and the embedded metal fittings are embedded so as to face each other from the surfaces to be connected to the flanges of the metal container on both sides, and insulation is provided between the opposing embedded metal fittings. An insulating ring characterized in that it is molded with a molded insulating member for holding. (2) Claim 1 in which the tip end surface embedded in the mold insulating member of the embedded fitting is formed into a spherical shape.
Insulating ring as described in section. (3) The insulating ring according to claim 1, wherein the opposing embedding fittings are embedded and molded with their facing surfaces alternately.