JPH06139858A - Fiber-reinforced platic insulating tube for lightning arrester and the like - Google Patents

Abstract

PURPOSE:To release the internal pressure without swelling a tube main body when an insulating tube is struck by an unexpected large-scale lightning stroke and the internal pressure quickly rises by providing a specific number of long hole-like pressure releasing recesses having a specific shape on the inner face of the tube wall of the FRP insulating tube. CONSTITUTION:A cylindrical pressure-proof, voltage-proof insulating tube 1 is constituted of a main body section 2 and upper and lower electrode fitting sections 3, 4. 2-6 long hole-like pressure releasing recesses 5 extended in the longitudinal direction of the insulating tube 1 and having the width 6-13mm are formed on the inner face of the main body section 2. The upper and lower electrode fitting sections 3, 4 are preferably formed thicker in thickness than the main body section 2 of the insulating tube 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulating cylinder made of fiber reinforced plastic (hereinafter referred to as "FRP") such as a lightning arrester, and more specifically, it is equipped with a lightning arrester and is installed in an insulator tube such as a lightning arrester or a lightning insulator. The present invention relates to an FRP insulating cylinder.
In the following description, an FRP insulating cylinder of the lightning arrester will be described as an example.

[0002]

2. Description of the Related Art Conventionally, many lightning arresters have been installed in transmission lines or distribution lines for the purpose of protecting various devices from abnormal voltage such as lightning surge.

As this lightning arrester H, for example, as shown in FIG. 3, a plurality of lightning arresting elements 7 having a non-linear resistance characteristic are stacked and housed in an FRP insulating cylinder 1 ', and both ends are made of a conductive material. There is known a structure in which the electrode terminals 8 and 9 are arranged and further housed in a rubber molding material 11 serving as a porcelain tube.

By the way, when the lightning arrester H has an unexpected large-scale lightning strike, the lightning arrester element 7 is abnormally discharged, and high temperature,
A high-pressure arc is generated, and a large amount of gas is generated in the FRP insulating cylinder 1'by this arc, the internal pressure rapidly rises, and FR
The P insulating cylinder 1'ruptures, the rubber molding material 11 is damaged, and various peripheral devices are also damaged.

Therefore, in recent years, even if there is an unexpected large-scale lightning strike on the arrester H, it is formed in a cage shape so that the damage to the rubber molding material 11 and the influence on various peripheral devices can be minimized. FRP insulating cylinder 1'provided with a plurality of openings (Japanese Unexamined Patent Publication No. 62-195181), or pressure release holes or slits penetrating the inside and outside of the cylinder wall or pressure release formed on the inner surface of the cylinder wall. FRP insulating cylinder 1'having concave portions and slits (Japanese Patent Application Laid-Open No. 63-45805, Japanese Patent Application Laid-Open No. 1-166421)
Japanese Patent Laid-Open No. 1-186518).

[0006]

[Problems to be Solved by the Invention]
In the RP insulating cylinder 1 ', since the pressure release part is formed on the cylinder wall in each case, an unexpected large-scale lightning strike caused FRP.
Even if a large amount of gas is generated in the manufactured insulating cylinder 1'and the internal pressure rises sharply, it can release the pressure, but the cage-shaped one has a complicated shape and is difficult to manufacture. It is not practical because it is quite expensive and expensive.

In the case where the cylinder wall is provided with pressure releasing holes, slits or recesses, if the number of them is small,
Sudden internal pressure cannot be released instantaneously, causing the cylinder to bulge or burst, or if the wall thickness of the cylinder is thin, it may break from the pin hitting parts at the top and bottom of the cylinder, resulting in sufficient pressure release. No effect. In order to form a large number of holes, slits or recesses in order to obtain a sufficient pressure release effect, F
Since the strength of RP is high and it is hard, special processing such as a laser processing machine must be performed, resulting in high manufacturing cost.

The present invention has been made in view of the above problems, and an object thereof is to expand the internal pressure of the cylinder body when the internal pressure sharply rises due to an unexpected large-scale lightning strike. It is an object of the present invention to provide an FRP insulating cylinder of a lightning arrester that has a pressure releasing portion that can release pressure without any effort and is easy to manufacture.

[0009]

In order to achieve the above object, an FRP insulating cylinder of a lightning arrester according to the present invention has a width extending in the longitudinal direction of the cylinder on the inner surface of the main body of the insulating cylinder. It is formed by forming 2 to 6 depression-shaped depressions having a long hole shape of 6 to 13 mm.

In the above FRP insulating cylinder,
It is preferable that the pin hitting portions in the upper and lower portions of the cylinder are formed to be thicker than the main body portion.

[0011]

In the FRP insulating cylinder of the present invention, the inner wall surface of the cylinder wall has a width, and 2 to 6 pressure-releasing recesses are formed in the shape of an elongated hole extending in the longitudinal direction of the cylinder. When the internal pressure of the FRP insulating cylinder suddenly rises due to such a lightning strike, the thin wall portion of the recess is broken according to the magnitude of the internal pressure, and the cylinder body does not swell, and a reliable pressure release effect is obtained.

In order to obtain such a reliable pressure release effect, the width of the recesses is preferably 6 to 13 mm and the number of recesses is 2 to 6. The reason for limiting in this way is that if the width is less than 6 mm, even if the number is 6, it may not be possible to obtain a reliable pressure release effect, and it is necessary to increase the number, which increases the manufacturing cost. This is because if the value exceeds 13 mm, the strength of the cylinder becomes problematic. Also, the number is 1
This is because even if the width of the book is 13 mm, a reliable pressure release effect cannot be obtained when an abnormal discharge site of the lightning arrester occurs on the opposite side of the recess. Further, within the above range, the recess can be formed in the FRP insulating cylinder relatively easily, and the manufacturing cost can be reduced.

Further, when the body of the FRP insulating cylinder is formed to be thin, the upper and lower pin driving portions may be formed to be thicker than the thickness of the body.
The weight of the insulating cylinder can be reduced safely.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1A and 1B are explanatory views of an FRP insulating cylinder of a lightning arrester according to the present invention, where FIG. 1A is a front view and FIG. 1B is a sectional view taken along line AA of FIG.

In the figure, reference numeral 1 denotes an FRP insulating cylinder, which is composed of a main body 2 and upper and lower electrode attaching portions 3 and 4, and an inner surface of the main body 2 is , Width 10 mm and three recesses 5 for releasing pressure at equal intervals of 120 degrees
Are formed. Further, the electrode attachment portions 3 and 4 are provided with insertion holes 6 for positioning pins for fixing the electrode terminals.

As shown in FIG. 3, the FRP insulating cylinder 1 thus constructed is incorporated into the lightning arrester as in the conventional case.
A plurality of lightning protection elements 7 having non-linear resistance characteristics are stacked and housed, and electrode terminals 8 and 9 made of a conductive material are fitted to both ends of the lightning protection elements 7 and fixed by positioning pins 10 to form a rubber tube. It is carried out by being housed in the molding material 11.

In the above-mentioned lightning arrester, even if the internal pressure of the FRP insulating cylinder 1 suddenly rises due to an unexpected large-scale lightning strike, the thin portion 12 of the recess 5 is broken according to the magnitude of the internal pressure and the main body 2
The internal pressure can be released safely without bulging.

Actually, the width of 10 mm on the outer surface of the mandrel is 1
Attach three convex molds at equal intervals of 20 degrees, and on this outer surface,
Continuous glass fibers impregnated with resin until the thickness of the main body portion 2 becomes 4 mm are transversely fed in the longitudinal direction by the filament winding method, and after laminating while rotating the mandrel, heating is applied to cure the resin, Length 350
An FRP insulating cylinder 1 having a total length of 470 mm, an outer diameter of 64 mm, and a wall pressure of 4 mm, which has a pressure releasing recess 5 having a width of 10 mm, and a depth of 3.5 mm, is manufactured, and the FRP insulating cylinder 1 is hermetically sealed and released according to the arrester standard A pressure test was performed. As a result, the rupture occurred in the thin portion 12 of the pressure release recess 5 without the main body 2 bulging. In addition, although the thin portion 12 is formed to have a relatively wide width of 10 mm and the main body portion 2 is formed to have a small width, the main body portion 2 is reinforced with continuous glass fiber, so that the main body portion 2 has high strength and No deformation was observed in Part 2.

In the above embodiment, the case where the thickness of the thin portion 12 of the pressure releasing recess 5 is 0.5 mm has been described as an example, but this thickness is taken into consideration in consideration of the strength balance with the main body 2. Body part 2
It is preferable to set it in the range of 1/100 to 1/10 of the wall thickness.

In the above embodiment, continuous glass fiber was described as a preferred example, but the present invention is not limited to this example, and short fiber may be used. In addition to glass fiber, aramid fiber, ceramic fiber or the like can be applied as the fiber, and epoxy resin, silicone resin, fluorine resin or the like can be applied as the resin impregnated or applied to the fiber.

In the above embodiment, the FRP insulating cylinder 1 having the same thickness as the main body 2 and the upper and lower electrode attaching portions 3 and 4 has been described as an example, but as shown in FIG. The upper and lower electrode attachment portions 3 and 4 may be thicker than the thickness of the portion 2. In this case, the strength around the pin insertion hole 6 is increased, and the wall thickness of the main body portion 2 is formed to be relatively thin, and the weight can be reduced.

[0022]

As described above, the F according to the present invention
If it is an RP insulating cylinder, apply it to a lightning arrester or lightning insulator, and swell the internal pressure of the FRP insulating cylinder even if the internal pressure of the FRP insulating cylinder suddenly rises due to an unexpected large-scale lightning strike. There is no need to worry about damaging the porcelain tube because the pressure can be released without any pressure. Further, since the pressure releasing recess has a width, it can be manufactured relatively easily and is practical.

[Brief description of drawings]

FIG. 1 is an explanatory view of an FRP insulating cylinder of a lightning arrester according to the present invention, in which (a) is a front view and (b) is AA of (a).
FIG.

FIG. 2 is an F of a lightning arrester showing another embodiment according to the present invention.
It is explanatory drawing of the insulating cylinder made from RP.

FIG. 3 is an explanatory view showing a left half of a lightning arrester in section.

[Explanation of symbols]

 1: FRP insulating cylinder 2: Main body part 3, 4: Electrode attachment part 5: Pressure release concave part 6: Pin insertion hole 7: Lightning arrester element 8, 9: Electrode terminal 10: Pin 11: Rubber molding material 12: Thin wall Department

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kunikazu Izumi 2-17-6 Hayashi, Yokosuka City, Kanagawa Prefecture (72) Inventor Junichi Kimura 1-14-502 Imazu Masagocho, Nishinomiya City, Hyogo Prefecture (72) Inventor Takayama Toru 3-15-25 Nakamiya, Asahi-ku, Osaka City, Osaka Prefecture (72) Inventor Hirohiko Terada 629 Kayahara, Sakurai City, Nara Prefecture (72) Inventor Shinichi Inami 3-17 Aobacho, Yokaichi City, Shiga Prefecture

Claims (2)

[Claims] 1. An elongated hole-shaped pressure releasing recess having a width of 6 to 13 mm extending in the longitudinal direction of the cylinder is formed on the inner surface of the body of a cylindrical pressure-proof and voltage-proof insulating cylinder (hereinafter referred to as an insulating cylinder). An insulating cylinder made of fiber reinforced plastic such as a lightning arrester, which is formed by forming 2 to 6 pieces. 2. The fiber reinforced for a lightning arrester or the like according to claim 1, wherein the thicknesses of the pinned portions at the upper and lower portions of the pressure-proof and withstand-voltage insulating cylinder are formed to be thicker than the thickness of the main body portion. Plastic insulation tube.