JP2800854B2 - Method for manufacturing fiber-reinforced plastic insulation cylinders such as lightning arresters - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention relates to a method for producing <br/> fiber reinforced plastic (hereinafter referred to as FRP) made of insulating Cylindrical lightning arrester or the like, in particular, accommodates lightning device, arrester and lightning The present invention relates to an insulating tube made of FRP and installed in an insulator tube such as an insulator. In the following description, an FRP insulating cylinder of a lightning arrester will be described as an example.

[0002]

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

[0002]

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

As the lightning arrester H, for example, as shown in FIG. 3, a plurality of lightning arresters 7 having non-linear resistance characteristics are stacked and accommodated in an insulating tube 1 'made of FRP, and both ends are made of a conductive material. There is known a structure in which electrode terminals 8 and 9 are provided, and further, they are accommodated in a rubber mold material 11 serving as an insulator tube.

When an unexpected large-scale lightning strike occurs in the lightning arrester H, the lightning arrester 7 is abnormally discharged, causing a high temperature.
A high-pressure arc is generated, and this arc generates a large amount of gas in the FRP insulating cylinder 1 ', and the internal pressure rises rapidly to reduce the FR pressure.
The P-made insulating cylinder 1 'bursts, damaging the rubber mold material 11, and also damaging peripheral devices.

Therefore, in recent years, even if an unexpected large-scale lightning strike occurs in the lightning arrester H, the lightning arrester H is formed in a cage shape so as to minimize the damage to the rubber molding material 11 and the effects on various peripheral devices. FRP insulating cylinder 1 '(Japanese Patent Laid-Open No. 62-195811) provided with a plurality of openings, or a pressure releasing hole or slit penetrating through the inside and outside of the cylinder wall or a pressure relief hole formed in the inner surface of the cylinder wall FRP insulating cylinder 1 'having a concave portion and a slit (see JP-A-63-45805 and JP-A-1-166421).
And Japanese Patent Laid-Open Publication No. 1-186518).

[0006]

SUMMARY OF THE INVENTION The above proposed F
In the case of the RP insulating cylinder 1 ′, since a pressure relief portion is formed on each of the cylinder walls, the FRP receives an unexpected large-scale lightning strike.
Even if a large amount of gas is generated in the insulating cylinder 1 'and the internal pressure rises sharply, the internal pressure can be released, but on the other hand, the one formed in a cage shape has a complicated shape and is difficult to manufacture. The cost is high and the cost is high, which is not practical.

In the case where a pressure releasing hole, a slit or a concave portion is formed in a cylindrical wall, if the number of such holes, slits or concave portions is small,
Sudden internal pressure cannot be released instantaneously, and the cylinder bulges or bursts.If the cylinder is thin, it may break down from the pin hitting parts at the top and bottom of the cylinder, and 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 and hardness of the RP are high, special processing such as a laser processing machine must be performed, and the production cost is high.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to increase the internal pressure of a cylinder body when the internal pressure suddenly rises due to an unexpected large-scale lightning strike. An object of the present invention is to provide a method of manufacturing an FRP insulating cylinder of a lightning arrester having a pressure releasing portion having a shape that can be easily released and has a shape that can be easily manufactured .

[0009]

In order to achieve the above object, a method of manufacturing an FRP insulating cylinder for a lightning arrester according to the present invention is provided.
The method consists of attaching 2 to 6 long-hole-shaped convexes for pressure relief to the outer peripheral surface of the mandrel with a width of 6 to 13 mm, and winding and laminating a continuous fiber impregnated with resin on the outer surface by a filament winding method. After forming a fiber reinforced plastic layer by removing the mandrel and removing the convex,
A pressure-resistant, voltage-resistant insulating cylinder (hereinafter referred to as an insulating cylinder) having a cylindrical shape of 0 mm or more is formed. recesses and forms 2-6 present.

[0010] In the above-described method of manufacturing the insulating tube made of FRP, the thickness of the pin hitting portions at the upper and lower portions of the tube may be formed to be larger than the thickness of the main body portion.

[0011]

According to the method of manufacturing an insulating tube made of FRP of the present invention, two to six convex holes having a width of 6 to 13 mm for pressure relief are attached to the outer peripheral surface of the mandrel, and the outer surface is impregnated with resin. after the continuous fibers is by stacking wound by a filament winding method to form a fiber-reinforced plastic layer, disconnect the mandrel, since the production by removing a convex, outer diameter 3
Width 6 to 13 extending in the longitudinal direction of the cylinder for a cylinder of 0 mm or more
It is possible to easily and inexpensively form a pressure relief recess having a long hole shape of mm. In the FRP insulating cylinder manufactured according to the present invention, two to six pressure-releasing recesses are formed in a long hole shape extending in the longitudinal direction of the cylinder, having a width on the inner surface of the cylindrical wall having an outer diameter of 30 mm or more. There is an unexpected large-scale lightning strike, FR
When the internal pressure of the P-made insulating cylinder rises sharply, the thin portion of the concave portion is broken according to the magnitude of the internal pressure, and the cylinder main body does not swell and a reliable pressure-releasing effect can be obtained.

In order to obtain such a reliable pressure releasing effect, the width of the concave portion is preferably 6 to 13 mm and the number of concave portions is preferably 2 to 6. The reason for limiting in this way is that if the width is less than 6 mm, a reliable pressure relief effect may not be obtained even if the number is six, and it is necessary to increase the number and the production cost becomes high. Is larger than 13 mm, a problem occurs in the strength of the cylinder. Also, if the number is 1
This is because in the book, even if the width is 13 mm, a reliable pressure relief effect cannot be obtained when an abnormal discharge site of the lightning arrester occurs on the opposite side of the concave portion. Further, within the above range, the concave portion can be formed in the FRP insulating cylinder relatively easily, and the manufacturing cost can be reduced.

Further, when the thickness of the main body of the FRP insulating cylinder is formed to be thin, it is preferable that the upper and lower pin hitting portions are formed to be thicker than the main body.
It is possible to safely reduce the weight of the insulating cylinder made of steel.

[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, wherein FIG. 1A is a front view, and FIG. 1B is a cross-sectional view taken along line AA of FIG.

In FIG. 1, reference numeral 1 denotes an FRP insulating tube, which is composed of a main body 2 and upper and lower electrode attaching portions 3 and 4. , Three pressure relief recesses 5 having a width of 10 mm and an equal interval of 120 degrees
Are formed. The electrode attachment portions 3 and 4 are provided with insertion holes 6 for positioning pins for fixing electrode terminals.

Incorporation of the FRP insulating cylinder 1 thus configured into a lightning arrester is performed as shown in FIG.
A plurality of lightning arresters 7 having non-linear resistance characteristics are stacked and accommodated therein, and electrode terminals 8 and 9 made of a conductive material are fitted to both ends of the lightning arresters 7 and fixed with positioning pins 10. This is performed while being housed in the molding material 11.

In the lightning arrester described above, 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 is broken.
Can safely release the internal pressure without swelling.

Actually, the outer surface of the mandrel has a width of 10 mm and a width of 1 mm.
Attach three convex shapes at equal intervals of 20 degrees, and on this outer surface,
Continuous glass fibers impregnated with resin are fed in the longitudinal direction by a filament winding method until the thickness of the main body 2 becomes 4 mm, and after laminating while rotating the mandrel, the resin is cured by heating, Length 350
A FRP insulating tube 1 having a total length of 470 mm, an outer diameter of 64 mm, and a thickness of 4 mm having a pressure releasing recess 5 having a width of 10 mm, a depth of 3.5 mm, and a thickness of 4 mm is manufactured. A pressure test was performed. As a result, the rupture occurred in the thin portion 12 of the depressurizing recess 5 without the main body 2 swelling. Also, despite the relatively thin width of the thin portion 12 of 10 mm and the narrow width of the main body 2, the main body 2 is reinforced with continuous glass fibers, so that the strength is high. In part 2, no deformation was observed. And
For this reason, the total width (width × number) of the thin portions 12 with respect to the outer peripheral length of the FRP insulating tube 1 is preferably in the range of about 1/5 to 1/10, and when it is larger than 1/5, the strength of the main body 2 is increased. It is feared that there will be no waste, and if it is smaller than 1/10, there is a concern that it is difficult to obtain a reliable pressure relief effect.

In the above-described 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. Body 2
It is preferable to set the thickness in the range of 1/100 to 1/10 of the thickness.

Further, in the above embodiment, continuous glass fiber has been described as a preferred example, but the present invention is not limited to this example, and short fiber may be used. As the fiber, an aramid fiber or a ceramic fiber can be used in addition to the glass fiber, and as the resin impregnated or applied to the fiber, an epoxy resin, a silicon-based resin, a fluorine-based resin, or the like can be used.

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

[0022]

As described above, the F according to the present invention is used.
If the insulation tube is made of RP, apply it to a lightning arrester or a lightning proof insulator, and even if the internal pressure of the insulation tube made of FRP suddenly rises due to an unexpected large-scale lightning stroke, the internal pressure of the insulation tube should be expanded. Since the pressure can be released without any problem, there is no need to worry about damaging the insulator tube. In addition, since the pressure-releasing recess has a width, it can be manufactured relatively easily by a filament winding method using continuous fibers impregnated with a resin, and is practical.

[Brief description of the drawings]

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

FIG. 2 shows a lightning arrester F showing another embodiment according to the present invention.
It is explanatory drawing of the insulation tube made of RP.

FIG. 3 is an explanatory diagram showing a left half of the lightning arrester in cross section.

[Explanation of symbols]

 1: insulating tube made of FRP 2: body part 3, 4: electrode attachment part 5: pressure relief recess 6: pin insertion hole 7: lightning arrester 8, 9, electrode terminal 10: pin 11: rubber molding material 12: thin wall Department

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takeshi Taniguchi 2128-9 Koamishiro, Misaki-cho, Miura-shi, Kanagawa Prefecture (72) Inventor Kuniwazu 2-17-6, Hayashi, Yokosuka-shi, Kanagawa Prefecture (72) Inventor Junichi Kimura Hyogo 1-14-502, Imazu Masago-cho, Nishinomiya-shi, Japan (72) Inventor Toru Takayama 3-15-25, Nakamiya, Asahi-ku, Osaka-shi, Osaka Inventor Shinichi Inami 3-17 Aoba-cho, Yokaichi-shi, Shiga (56) References JP-A-1-209968 (JP, A) JP-A-1-166421 (JP, A) JP-A-2-234376 (JP, A) )

Claims (2)

(57) [Claims] 1. A fiber-reinforced plastic layer comprising a plurality of elongated pressure-releasing convex shapes attached to the outer peripheral surface of a mandrel, and continuous fibers impregnated with a resin wound and laminated on the outer surface thereof by a filament winding method. after forming the, remove the mandrel, by removing the convex, the inner surface, a plurality of recesses in the longitudinal direction the elongated hole-shaped release pressure that extends the cylinder
It has been manufactured of fiber reinforced plastic insulation Cylindrical arrester etc.
Construction method . Wherein the wall thickness of the pin strokes of the upper bottom, method for producing a fiber reinforced plastic insulation Cylindrical lightning arrester or the like 請 Motomeko 1 wherein is formed thicker than the body portion ing.