JPS6369413A - Insulating spacer - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to an insulating spacer, and in particular to a current-carrying spacer used for connecting high voltage conductors arranged on both sides of an insulating spacer. This invention relates to an insulating spacer with improved means for fixing electrodes to the insulating spacer.

(Prior Art) Many insulating spacers are used in gas-insulated switchgears and pipeline air power transmission devices to insulate and support high-voltage conductors in grounded metal containers.

FIG. 3 shows the structure of a conventionally used insulating spacer. That is, a grounded metal container 1 is filled with an insulating gas 2 such as SF6 gas, and an insulating spacer 3 having a current-carrying electrode 4 penetrating therethrough and supported therein is disposed.

Further, a plurality of embedded electrodes 5 are provided on the outer periphery of the insulating spacer 3, and the flange portion 1a of the metal container 1 and the insulating spacer 3 are fastened and fixed with bolts or the like.

Further, a flange portion 4a is formed on the current-carrying electrode 4, and a through-hole 6 is formed in the center of the insulating spacer 3, into which the insertion portion 4b of the current-carrying electrode 4 is inserted. ing. Roughly speaking, the retainer ring 7 is attached to the insertion portion 4b of the current-carrying type@4 from the opposite side of the insulating spacer 3, and the retainer ring 7 and the insulating spacer 3 are attached with a plurality of bolts 8.
And the flange portion 4a of the N-type electrode 4 is tightened and fixed.

Further, a high voltage conductor 9 is attached to the conductor attaching portion 4C of the current-carrying electrode 4 via a spring mechanism 10.

A sealing groove is formed in the outer circumferential portion of the insulating spacer 3, and an O-ring 11 is disposed inside the sealing groove to maintain air-concavity between the flange portion 1a of the metal container and the insulating spacer 3.

However, the conventional insulating spacer as described above has the following drawbacks.

That is, in the conventional insulating spacer 3, the current-carrying electrode 4 is insulated by forming the flange portion 4a on the current-carrying electrode 4, attaching the holding ring 7 from the opposite side of the insulating spacer 3, and tightening both with bolts 8. Since it is fixed to the spacer 3, a space is required to attach a plurality of bolts 8 to the flange portion 4a of the current-carrying electrode 4 and the holding ring 7. Therefore, 1! The outer diameters of the In flange portion 4a and the retaining ring 8 are increased, and the distance between the ends of the flange portion 4a and the retaining ring 8, which are at high potential, and the metal container 1, which is at ground potential, is shortened, and the insulation is reduced. The drawback was that performance deteriorated.

Furthermore, since the head of the bolt 8 is exposed, it tends to become a weak point in terms of insulation, and it is rarely necessary to electrically shield this part. Conventionally, a method has been adopted in which the head of the bolt 8 is shielded by a high voltage conductor 9, but in this case, the diameter of the high voltage conductor 9 must also be increased, resulting in a significant drop in insulation performance.

Furthermore, in order to fix the current-carrying electrode 4 to the insulating spacer 3, it is necessary to tighten a plurality of bolts 8, and the tightening force is not uniform, so that the flange portion 4a of the insulating spacer 3 and the current-carrying electrode 4, Another disadvantage is that a gap is formed between the insulating spacer 3 and the holding ring 7, making it impossible to maintain the air-bacterial properties of the insulating gas 2.

In addition, holes must be formed in the insulating spacer 3 to attach the bolts 8, which complicates the manufacturing process of the insulating spacer, and furthermore, it takes time to tighten the bolts 8, reducing work efficiency. It was bad.

Moreover, in the insulating spacer part, there is not only a case where a current-carrying electrode as described above is provided, but also a current-carrying electrode supporting a high-voltage conductor on one side of the insulating spacer, and a high-voltage conductor protruding from the surface of the insulating spacer on the other side. Although a shield is sometimes attached, the conventional method of attaching the electrode as described above has caused the problem that the attachment of such a high-voltage shield electrode requires a complicated structure. In addition, with the high-voltage shield electrode provided on the insulating spacer, special attention must be paid to mitigating the electric field at that part and improving insulation properties, but conventional means with many protrusions as described above cannot achieve such insulation performance. Rarely are things difficult to satisfy.

(Problems to be Solved by the Invention) As mentioned above, in the conventional insulating spacer, the outer diameters of the flange portion of the current-carrying electrode and the retaining ring are large.
The distance between the metal container, which is at ground potential, had become shorter, and the insulation performance had deteriorated.

Additionally, the diameter of the high voltage conductor must be increased to electrically shield the exposed bolt head.
Insulation performance was significantly degraded.

Therefore, the present invention was proposed to eliminate the above-mentioned drawbacks, and by improving the connection part of the current-carrying electrode,
The object of the present invention is to provide an insulating spacer with significantly improved insulation performance and simplified assembly process.

[Structure of the Invention] (Means for Solving the Problems) The insulating spacer of the present invention has a threaded portion formed on a current-carrying electrode disposed through a through hole formed in the center thereof; In order to fix the current-carrying electrode to the insulating spacer, a second electrode attached from the opposite side of the insulating spacer is provided with a tightening portion that is screwed into the threaded portion of the current-carrying electrode.

As the second electrode, a current-carrying electrode and a high-voltage shield electrode are used, each of which has a tightening portion that engages with a screw portion formed on the current-carrying electrode.

(Function) The insulating spacer of the present invention has a current-carrying electrode disposed in a through hole formed in the center thereof, and a second electrode having a tightening portion that is screwed into the current-carrying electrode from the opposite side of the insulating spacer. By attaching and tightening both, the current-carrying electrode and the second electrode are fixed to the insulating spacer, and the insulating performance of the insulating spacer is greatly improved. Furthermore, the work of attaching the current-carrying electrodes is simplified.

(Example) Hereinafter, an example of the present invention will be specifically described based on FIGS. 1 and 2. Incidentally, the same members as those of the conventional type shown in FIG. 3 are given the same reference numerals, and explanations thereof will be omitted.

■First Example Configuration of this Example* In this example, a current-carrying electrode is used as the second electrode provided on the opposite side of the insulating spacer.

That is, as shown in FIG. 1, a through hole 6 is formed in the center of the insulating spacer 3 for arranging a current-carrying electrode. Further, a current-carrying electrode 21 having a female screw formed in the insulating spacer insertion portion 21b is inserted into the through hole 6, and from the opposite side of the insulating spacer 3, a current-carrying electrode 21 having the female screw formed in the insertion portion 22b is inserted. A current-carrying electrode 22 is attached which has a male thread formed therein to engage with the energizing electrode 22 . Roughly speaking, an O-ring 23 is formed at the joint between the flange portion 22a of the current-carrying electrode 21 having a female thread and the insulating spacer 3, and an O-ring 24 is disposed inside the O-ring 23.

Moreover, a conductive paint 25 is applied to the inner surface of the through hole 6 of the insulating spacer 3 in order to prevent deterioration of insulation performance due to poor contact with the current-carrying electrodes 21 and 22.

Roughly speaking, a high voltage conductor 9 is attached via a spring mechanism 10 to the conductor attaching portions 21G and 22C of the current-carrying electrodes 21 and 22 disposed on both sides of the insulating spacer 3, respectively.

Effect of this embodiment* In the insulated spacer of this embodiment having such a configuration, in order to fix the current-carrying electrodes 21 and 22 to the insulating spacer 3, first, the insertion portion 21b of the current-carrying electrode 21 in which a female screw is formed is inserted. is inserted into the through hole 6 of the insulating spacer. next,
The insertion portion 22b of the current-carrying electrode 22 having a male thread formed thereon is inserted into the through-hole 6 from the opposite side of the insulating spacer 3, and the threaded portions of both the current-carrying electrodes 21 and 22 are tightened together.

When fixing the current-carrying electrodes 21, 22 to the insulating spacer 3 in this manner, holes for conventional bolt attachment are formed in the seven-rank parts 21a, 22a formed on the current-carrying electrodes 21, 22. Since this is not necessary, the diameter of the 7th rank portion can be significantly reduced, and the insulation distance from the metal container 1, which is at ground potential, can be significantly increased. As a result, the dielectric strength of the insulating spacer can be significantly improved.

In addition, current-carrying electrodes 21 disposed on both sides of the insulating spacer 3
．． The insertion parts 21b and 22b of 22 are formed with threaded parts that fit into each other, and by tightening them, it is possible to connect both current-carrying electrodes 21 and 22, which greatly simplifies the installation of the current-carrying electrodes. be done.

Furthermore, since the current-carrying electrodes 21 and 22 are fixed to the insulating spacer 3 by tightening one large screw, the tightening force is uniform over the entire outer circumference of the current-carrying IfM, and the current-carrying electrodes 21 and 22 are fixed to the insulating spacer 3 by tightening one large screw. Electrode 21.22
Since there is no gap at the joint surface with the insulating gas, the airtightness of the insulating gas is extremely high.

Further, since there is no need to form holes in the insulating spacer 3 for bolt attachment, the manufacturing process of the insulating spacer 3 is simplified.

■Second Example Configuration of this Example* In this example, a high voltage shield electrode is used as the second electrode provided on the opposite side of the insulating spacer. That is, as shown in FIG. 2, a through hole 6 is formed in the center of the insulating spacer 3 for arranging a current-carrying electrode. Also,
A threaded portion 31 is formed at the tip of the insulating spacer insertion portion 30b of the current-carrying electrode 30. In addition, the insulating spacer 3 has an O
A ring groove 33 is formed, and an O-ring 34 is disposed inside the groove.

On the other hand, on the opposite side of the insulating spacer 3, the current-carrying electrode 30
A high-voltage shield electrode 36 in which a through hole 35 is formed to pass through the threaded portion 31 of the high-voltage shield electrode 36 is screwed to the current-carrying electrode 30 by a disk nut 37, and the current-carrying electrode 30 and high-voltage shield electrode 36 are fixed to the insulating spacer 3. ing.

Furthermore, a conductive paint 38 is applied to the inner surface of the through hole 6 of the insulating spacer 3 in order to prevent deterioration of insulation performance due to poor contact with the current-carrying electrode 30.

Further, a high voltage conductor 9 is attached to the conductor attaching portion 30c of the N-electrode 30 via a spring mechanism 10.

Effect of this embodiment* In the insulating spacer of this embodiment having such a configuration, in order to fix the current-carrying electrode 30 to the insulating spacer 3, first, the current-carrying chamber +X30 is inserted into the through hole 6 of the insulating spacer. . Next, from the opposite side of the insulating spacer 3, the current-carrying electrode 30
A high-voltage shield electrode 36 having a through hole 35 through which the threaded portion 31 passes is attached, and the threaded portion 31 of the current-carrying electrode 30 is tightened with a disk nut 37 from the outside of the high-voltage shield electrode 36.

When fixing the current-carrying electrode 30 to the insulating spacer 3 in this way, the seven land portions 30a formed on the current-carrying electrode 30 are
In addition, there is no need to form holes for conventional bolt installation, so the diameter of the flange can be significantly reduced.
The insulation distance from the metal container 1, which is at ground potential, can be significantly increased. As a result, the dielectric strength of the insulating spacer can be significantly improved.

Also, current-carrying electrodes 30 disposed on both sides of the insulating spacer 3
A threaded portion 31 formed at the tip of the high voltage shield electrode 36
The current-carrying electrode 30 and the high-voltage shield electrode 36 can be fixed to the insulating spacer 3 by engaging them and tightening them with the disk nut 37, so that the work for attaching the current-carrying electrode is greatly simplified.

Roughly speaking, since the current-carrying electrode 30 is fixed to the insulating spacer 3 by tightening the screw portion 31 formed on the current-carrying N electrode 30 with a disc nut 37, the tightening force is applied to the entire outer circumference of the current-carrying electrode. Since there is no gap between the insulating spacer 3 and the current-carrying electrode 30, and between the insulating spacer 3 and the high-voltage shield electrode 36, the airtightness of the insulating gas becomes extremely high. Further, since there is no need to form holes in the insulating spacer 3 for bolt attachment, the manufacturing process of the insulating spacer 3 is simplified.

*Other Embodiments* Note that the present invention is not limited to the above-described embodiments, and the insulating spacer can be applied not only to single-phase insulating spacers but also to three-phase insulating spacers.

[Effects of the Invention] As mentioned above, according to the present invention, a threaded portion is formed on the current-carrying electrode disposed in the through hole formed in the center of the insulating spacer, and the threaded portion is attached from the opposite side of the insulating spacer. Second
An insulating spacer that greatly improves insulation performance and simplifies the assembly process by simply forming a threaded part on the electrode that engages with the threaded part and tightening both to fix it to the insulating spacer. can be provided.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a sectional view showing a first embodiment of an insulating spacer of the present invention, FIG. 2 is a sectional view showing a second embodiment of an insulating spacer of the present invention, and FIG. 3 is a sectional view of a conventional insulating spacer. FIG. 3 is a sectional view showing an insulating spacer of FIG.・ 1...Metal container, 1a...Flange part, 2.=S
F6 gas, 3... Insulating spacer, 4... Current-carrying electrode, 4a... Flange part, 4b... Insertion part, 4C...
・Conductor attachment part, 5... Embedded electrode, 6... Through hole, 7... Holding ring, 8... Bolt, 9... High voltage conductor, 10... Spring mechanism, 11...・0 ring, 2
DESCRIPTION OF SYMBOLS 1... Current-carrying electrode having a female screw, 21a... Flange portion, 21b... Insertion portion, 21C... Conductor mounting portion, 22... Current-carrying electrode having a male screw, 22a...
Flange part, 22b...insertion part, 22C...; conductor mounting part, 23...0-ring groove, 24...0-ring, 2
5... Conductive paint, 30... Current-carrying electrode, 31...
Threaded part, 33・-0 ring groove, 34...0 ring, 3
5... Through hole, 36... High voltage shield electrode, 37...
... Disc nut, 38... Conductive paint. Figure 1 Figure 2

Claims (6)

[Claims] (1) An insulating spacer in which a high-voltage conductor is inserted into a metal container filled with insulating gas, and the high-voltage conductor is insulated and supported from the metal container by a current-carrying electrode installed in a through hole formed in the insulating spacer. An insertion part to be inserted into the through hole of the insulating spacer is formed on the opposite side of the conductor attachment part of the current-carrying electrode, and a threaded part is formed in this insertion part, while the opposite side of the current-carrying electrode of the insulating spacer is formed to be inserted into the through hole of the insulating spacer. An insulating spacer characterized in that a second electrode is disposed on the side thereof, and a tightening portion is formed on the second electrode to be screwed into a threaded portion of the current-carrying electrode. (2) The insulating spacer according to claim 1, wherein the second electrode is another current-carrying electrode provided on the opposite side of the current-carrying electrode. (3) The insulating spacer according to claim 1, wherein the second electrode is a high-voltage shield electrode provided on the opposite side of the current-carrying electrode. (4) The insulating spacer according to claim 1, wherein the tightening portion is a threaded portion that is integrally provided with the second electrode and screwed into a threaded portion of the current-carrying electrode. (5) The insulating spacer according to claim 1, wherein the tightening portion is a disc nut that is screwed onto a threaded portion of the current-carrying electrode to integrate the current-carrying electrode and the second electrode. (6) The insulating spacer according to claim 1, wherein the through hole of the insulating spacer has an inner surface coated with a conductive paint.