JP2000048658A - Lightning arresting insulator for power transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact and lightweight lightning arresting insulator preventing serious damage such as stripping and breakage even when excessive fault current passes through lightning arresting elements, and easy to install. SOLUTION: In this lightning arresting insulator, plural lightning arresting elements 10 made of a material having a non-linear voltage-current characteristic are added with axial compressive force by springs between electrode metal fittings 11 at both ends, to be piled up. Plural nonconducting fibrous bundles 20 are axially arranged at the prescribed intervals between the lightning arresting elements 10 and the metal fittings 11 at both ends, and the nonconducting fibrous bundles 20 are fixed at the portions of the metal fittings 11 at both ends. Then, the outer periphery of the nonconducting fibrous bundles 20 is covered with a nonconducting fibrous sleeve 22 provided with apertures 21, and further the outer periphery of the nonconducting fibrous sleeve 22 is covered with an incrustation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightning insulator having a small size, a light weight, and an easy installation, and more particularly, to a power transmission device with improved reliability which is hardly affected by an excessively large fault current. About lightning arrester.

[0002]

2. Description of the Related Art Conventionally, as a lightning arrester for power transmission, as shown in FIG. 6, a lightning arrester 3 is housed in a stack of FRP cylinders 2 with pressure relief holes 1 and both ends of the FRP cylinder 2 are connected to each other. It is known that the lightning arrester 3 and the FRP cylinder 2 are covered with a jacket 5 made of silicone rubber or EP rubber or the like while being fixed with a metal fitting 4 (see Japanese Patent Publication No. 2-3241). Further, in order to apply a compressive force in the axial direction to the lightning arrester, a lightning arrester having a non-conductive fiber winding helically wound around the lightning arrester (see Japanese Patent Publication No. 4-10721). A lightning arrester having a non-conductive fiber winding provided with an opening for allowing gas to escape (see Japanese Patent No. 2520467) is also known. Further, a lightning arrester having a fibrous winding made of a glass fiber impregnated with a resin in close contact with the outer surface of the lightning arrester and having a portion not covered by the fiber of at least about 15% (Japanese Unexamined Patent Publication No. 29285
Is known.

[0003]

However, the lightning arrester disclosed in Japanese Patent Publication No. 2-3241 has a large number of parts, so that the number of man-hours inevitably increases, and there is a problem in terms of cost. Japanese Patent Publication No. Hei 4-10721, Patent No. 25204
The lightning arresters described in JP-A-67-67 and JP-A-3-29285 and the like have an excessive fault current (for example, 40 kA, 0.
When 2s) flows on the surface of the lightning arrester, there is a problem that the high-temperature internal pressure gas generated is likely to burn out the intersecting non-conductive fiber windings. In the lightning arresters described in these publications, the non-conductive fiber winding is wound so as to apply a compressive load in the axial direction to a plurality of elements. There is no axial load on the plurality of elements, and as a result, the assembly does not have the required mechanical strength, and the lightning arrester suffers severe damage such as a body cut.

[0004] The present inventor has conducted intensive studies in view of these problems in the related art. As a result, in the related art, a non-conductive fiber winding is conventionally wound in a spiral shape.
The present inventors have found that they are susceptible to high-temperature internal-pressure gas due to an excessive fault current, and have reached the present invention.

[0005]

That is, according to the present invention, a plurality of lightning arresters made of a material having a non-linear voltage-current characteristic are formed by a spring between electrode fittings at both ends and a plurality of lightning arresters are arranged between the plurality of lightning arresters. Stacking while applying a compressive force in the direction, arranging a plurality of bundles of non-conductive fibers in the axial direction at predetermined intervals between the lightning arrester and the metal fittings at both ends, and fixing the bundle of non-conductive fibers at the metal fittings at both ends. Then, cover the sleeve made of non-conductive fiber provided with an opening from the outer peripheral side of the non-conductive fiber bundle,
Further, there is provided a power transmission lightning arrester (first invention), characterized in that the nonconductive fiber sleeve is covered with a jacket from the outer peripheral side.

Further, according to the present invention, a plurality of lightning arresters made of a material having a non-linear voltage / current characteristic are provided with an axial compressive force between the plurality of lightning arresters by a spring between electrode fittings at both ends. The lightning arrester and the non-conductive fiber sleeve provided with openings around the metal fittings at both ends are covered, and a plurality of non-conductive fiber bundles are formed on the outer peripheral side of the non-conductive fiber sleeve at predetermined intervals. A lightning surge arrester for power transmission, comprising: being opened and arranged in the axial direction, fixing the non-conductive fiber bundle at both end metal fittings, and further covering the outer surface of the non-conductive fiber bundle with a jacket. (2nd invention) is provided.

Further, according to the present invention, a plurality of lightning arresters made of a material having a non-linear voltage / current characteristic are provided with an axial compressive force between the plurality of lightning arresters by a spring between electrode fittings at both ends. A plurality of bundles of non-conductive fibers are arranged in the axial direction at predetermined intervals between the lightning arrester and the metal fittings at both ends, and the bundle of non-conductive fibers is fixed at the metal fittings at both ends. A light-transmitting lightning arrester (third invention) characterized in that a non-conductive fiber is wound in the radial direction from the outer peripheral side and a pressure release hole is formed, and the non-conductive fiber is covered with a jacket from the outer peripheral side. ), Are provided.

Further, according to the present invention, a plurality of lightning arresters made of a material having a non-linear voltage / current characteristic are formed by applying a compressive force in the axial direction between the plurality of lightning arresters by a spring between electrode fittings at both ends. Stacking while applying, between this lightning arrester element and both ends metal fittings, a plurality of molded plates formed by impregnating and curing the resin with non-conductive fibers are arranged at predetermined intervals in the axial direction,
A molding ring formed by impregnating and curing the resin into the non-conductive fibers from the outer peripheral side of the molding plate is arranged in the radial direction to form a pressure relief hole, and the molding plate is fixed at both ends of the metal fittings. A power transmission lightning arrester (fourth invention) is provided, which is formed by coating a forming plate and a forming ring with an outer periphery from an outer peripheral side thereof.

In the first to third inventions,
A non-conductive fiber bundle, a non-conductive fiber sleeve, and a non-conductive fiber impregnated with an epoxy-based resin in advance may be used, or a non-conductive fiber bundle, a non-conductive fiber sleeve After disposing the non-conductive fiber around the lightning arrester, the resin may be impregnated.

[0010] The lightning arrester of the present invention has the above configuration, and thus has the following effects. The lightning arrestor is placed in parallel with the transmission line erection equipment such as the insulator. When a lightning surge occurs on a power transmission tower or electric wire, this voltage is applied to the erection equipment. At this time, the current flows through the lightning arrester arranged in parallel with the erection equipment, and the lightning arrester stored in the lightning arrester Reduces the resistance value quickly due to the non-linearity of the voltage-current characteristics, discharges a large lightning surge current, and reduces the lightning surge voltage of the line. However, if an excessive lightning surge is received and the amount of the surge exceeds the design resistance of the lightning arrester, a fault current flows through the lightning arrester and the lightning arrester is damaged. In this case, in the lightning arrester of the present invention, the lightning arrester is damaged and a high-temperature and high-pressure internal pressure gas is generated. Even if the conductive fiber is partially damaged, the non-conductive fiber (fiber strip) in the axial direction remains, so that the tensile strength in the axial direction is sufficiently maintained and the lightning arrester is not disconnected.

[0011]

Next, the present invention (first invention to fourth invention)
The power transmission lightning arrester according to the invention will be described in detail based on the illustrated embodiment. First, the first invention will be described. FIG.
(a) (b) (c) is a schematic block diagram showing a state in which a non-conductive fiber bundle and a non-conductive fiber sleeve are arranged around a lightning arrester in the first invention. FIG. 2 is a schematic configuration diagram showing one embodiment of a power transmission lightning arrester according to the first invention. FIG.
(a) As shown in (b) and (c), in the first invention, a plurality of lightning arresters 1 made of a material having a non-linear voltage-current characteristic are used.
Numerals 0 are stacked while maintaining electrical connection between the electrode fittings 11 at both ends. A plurality of non-conductive fiber bundles 20 are arranged in the axial direction at predetermined intervals between the lightning arrester 10 and the both-end metal fittings 11, and the non-conductive fiber bundles 20 are arranged at predetermined locations on the both-end metal fittings 11. It is tied and fixed by an object 23 or the like.

Next, a sleeve (a tube knitted in a cross shape) 22 made of a non-conductive fiber and provided with an opening (a pressure release hole) 21 is covered from the outer peripheral side of the non-conductive fiber bundle 20. And
As described below, the non-conductive fiber bundle 20 and the non-conductive fiber sleeve 22 are impregnated with a resin, and the resin is cured to form an FRP structure such as a reinforced plastic. Next, as shown in FIG. 2, the lightning arrester according to the first embodiment is formed by covering the outer periphery of the non-conductive fiber sleeve 22 with the jacket 14. In addition,
Although not shown, in the power transmitting lightning arrester of the present invention, an axial compressive force is applied between the plurality of lightning arresters 10 by a spring. In other words, a bundle of non-conductive fibers or a molded plate formed by impregnating the non-conductive fibers with a resin on the surface of the lightning arrester 10 in the axial direction causes an axial compression force between the plurality of lightning arresters 10. However, although the tensile strength in the axial direction is extremely high, a plurality of lightning arresters 10 can be held even when a high-temperature and high-pressure internal gas is generated in the lightning arrester as described later. It is for having a function.

The non-conductive fiber bundle 20 and the non-conductive fiber sleeve 22 may be impregnated with a resin such as an epoxy resin in advance, or the non-conductive fiber bundle 20 and the non-conductive fiber After disposing the sleeve 22 around the lightning arrester 10, the non-conductive fiber bundle 20 and the non-conductive fiber sleeve 22 may be impregnated with resin. After impregnating the non-conductive fiber bundle 20 and the non-conductive fiber sleeve 22 with resin, the resin is cured to form an FRP structure such as a reinforced plastic.

The lightning arrester 10 may be made of a material having a non-linear voltage-current characteristic, such as a metal oxide such as zinc oxide (ZnO) or silicon carbide (Si).
C) can be used. The non-conductive fiber bundle 20 and the non-conductive fiber sleeve 22 may be made of non-conductive fibers made of glass, plastic, ceramic or the like, but glass fibers are preferable.

The non-conductive fiber bundle 20 and the non-conductive fiber sleeve 22 may be impregnated with an epoxy resin or the like in advance, or the non-conductive fiber bundle 20 and the non-conductive fiber After disposing the sleeve 22 on the surface of the lightning arrester 10, the non-conductive fiber bundle 20 and the non-conductive fiber sleeve 22 may be impregnated with resin. Non-conductive fiber bundle 2
After impregnating the resin into the sleeve 22 made of non-conductive fiber or non-conductive fiber, the resin is cured to form an FRP structure such as reinforced plastic. As the resin, an epoxy resin, a polyester resin, and a lipoxy resin can be used, but an epoxy resin is preferable.

The opening area of the pressure relief hole 21 is preferably 8 to 30% with respect to the surface area of the lightning arrester 10,
25% is more preferred. When the opening area of the pressure release hole 21 is within the above range, even if an excessive fault current such as a short-circuit current of 40 kA (0.2 seconds) flows through the lightning arrester 10, the explosion does not occur. Lightning arrester 10 and non-conductive fiber bundle 20
The outer cover 14 coated on the outer peripheral side of the sleeve 22 made of non-conductive fiber is made of an organic elastic insulating material such as silicone rubber, ethylene propylene rubber (EPDM) or the like, and is usually molded into an insulator shade shape. Is done.

In the lightning arrester for power transmission according to the first invention configured as described above, even if an excessive fault current flows to the lightning arrester and the lightning arrester is damaged, even if a high-temperature and high-pressure internal pressure gas is generated, Since the pressure release hole (opening) is appropriately provided and the non-conductive fiber bundle and the non-conductive fiber sleeve cover the lightning arrester, the non-conductive fiber bundle and the non-conductive fiber sleeve are partially Even if it breaks, a plurality of non-conductive fibers (fiber strips) in the axial direction remain, and the tensile strength in the axial direction is sufficiently maintained, so that there is an operational effect that major damage such as separation does not occur. Also, this lightning arrester is easy to install,
In addition, the size and weight can be reduced.

Next, the second invention is different from the first invention only in that the order of disposing the non-conductive fiber bundle 20 and the non-conductive fiber sleeve 22 to the lightning arrester 10 is reversed. The other configuration, operation and effect are the same.

Next, the third invention will be described. FIG.
(a) (b) is a schematic block diagram showing a state where a non-conductive fiber bundle and a non-conductive fiber are arranged around a lightning arrester in the third invention. FIG. 4 is a schematic configuration diagram showing one embodiment of the power transmission lightning arrester according to the third invention. As shown in FIGS. 3 (a) and 3 (b), in the third invention, a plurality of non-conductive fiber bundles 30 are arranged in the axial direction between the lightning arrester 10 and both end fittings 11 at predetermined intervals. A bundle 30 of non-conductive fibers is bound and fixed by a fiber strip 31 or the like at a predetermined portion of the metal fittings 11 on both ends.

Next, a non-conductive fiber 32 is wound in the radial direction from the outer peripheral side of the non-conductive fiber bundle 30. In this case, the non-conductive fibers 32 are also wound in the radial direction at predetermined intervals, so that the pressure release holes 33 having an appropriate opening area are provided.
Is formed. As described below, the non-conductive fiber bundle 30 and the non-conductive fiber 32 are impregnated with a resin, and the resin is cured to form an FRP structure such as a reinforced plastic. Next, as shown in FIG. 4, the lightning arrester according to the third aspect of the present invention is formed by coating the outer periphery of the non-conductive fiber 32 with the jacket 14.

Non-conductive fiber bundle 30 and non-conductive fiber 3
2 may be impregnated with a resin such as an epoxy resin in advance, or the non-conductive fiber bundle 30 and the non-conductive fiber 32 may be arranged around the lightning arrester 10 and then be non-conductive. The fiber bundle 30 and the non-conductive fibers 32 may be impregnated with a resin. Non-conductive fiber bundle 30 and non-conductive fiber 3
After impregnating the resin with the resin 2, the resin is cured to form an FRP structure such as a reinforced plastic.

In the lightning arrester of the third invention configured as described above, even if an excessive fault current flows to the lightning arrester and the lightning arrester is damaged, even if a high-temperature and high-pressure internal pressure gas is generated,
Since the pressure release holes are appropriately provided and the non-conductive fiber bundle and the non-conductive fiber cover the lightning arrester, even if the non-conductive fiber bundle and the non-conductive fiber are partially damaged, A plurality of non-conductive fibers (fiber strips) remain to maintain sufficient tensile strength in the axial direction, and have the effect of not causing major damage such as separation. Further, the lightning arrester can be easily mounted, and can be reduced in size and weight.

Next, a fourth invention will be described. FIG.
(a) is a schematic block diagram showing a state where a plurality of lightning arresters are stacked between metal fittings at both ends in the fourth invention. Fig. 5 (b)
FIG. 7 is a schematic configuration diagram showing an embodiment of a power transmission lightning arrester according to a fourth invention. As shown in FIGS. 5 (a) and 5 (b), in the fourth invention, between the lightning arrester 10 and the metal fittings 11 at both ends,
Molded plate 50 obtained by impregnating and curing resin in non-conductive fibers
Are arranged in the axial direction at predetermined intervals, and the molding rings 51 formed by impregnating and curing the non-conductive fibers with the resin from the outer peripheral side of the molding plate 50 are arranged in the radial direction at predetermined intervals. The pressure release hole 52 is formed.

The molded plate 50 has concave portions 53 at both ends.
Is provided so that it can be fitted into the groove 54 formed in the metal fittings 11 at both ends, and the formed plate 50 is axially moved so that the concave portion 53 of the formed plate 50 is fitted into the groove 54 of the metal fittings 11 at both ends. After being arranged, it is tied up with a fiber strip 55 such as glass fiber and the like, and cured and fixed with resin. Next, as shown in FIG. 5 (b), the lightning arrester according to the fourth aspect of the present invention is formed by coating the outer periphery of the forming plate 50 and the forming ring 51 with the jacket 14.

In the lightning arrester of the fourth invention configured as described above, even if an excessive fault current flows through the lightning arrester and the lightning arrester is damaged, a high-temperature and high-pressure internal pressure gas is generated.
Since the pressure relief holes are appropriately provided and the molded plate and the molded ring cover the lightning arrester, even if the molded plate or the molded ring is partially damaged, the non-conductive fibers in the axial direction constituting the molded plate There is a high possibility that (fiber strips) remain, and since the tensile strength in the axial direction is sufficiently maintained, there is an operational effect that major damage such as disconnection does not occur. Further, the lightning arrester can be further easily mounted, and can be reduced in size and weight.

Hereinafter, the results of a pressure release test at the time of an excessive current will be described. Using the lightning arrester according to the third invention of the present invention, a pressure releasing test at an excessive current was performed by changing the area ratio of the pressure releasing hole to the surface area of the lightning arrester. Table 1 shows the results. In the lightning arrester according to the third invention, the lightning arrester was made of zinc oxide, the non-conductive fiber was glass fiber, and the resin was epoxy.

[0027]

[Table 1]

As is clear from the above results, the ratio of the pressure release hole area is preferably 10 to 30%, particularly preferably 20 to 25%.
% Is preferable.

As described above, the present invention has been sequentially described based on the embodiments of the first to fourth inventions. However, the present invention is not limited to these embodiments, and does not depart from the concept of the present invention. It can be changed as appropriate.

[0030]

As described above, according to the lightning arrester for power transmission of the present invention, even if an excessive fault current flows through the lightning arrester, it does not cause major damage such as disconnection of the lightning arrester, and furthermore,
This lightning arrester has an effect that it can be easily mounted, and can be reduced in size and weight.

[Brief description of the drawings]

FIG. 1 shows a state in which a non-conductive fiber bundle and a non-conductive fiber sleeve are arranged around a lightning arrester in the first invention, (a) is a schematic configuration diagram thereof, and (b) is a non-conductive FIG. 1C is a schematic configuration diagram illustrating a conductive fiber sleeve, and FIG.

FIG. 2 is a schematic configuration diagram showing one embodiment of a lightning arrester according to the first invention.

FIG. 3 shows a state in which a non-conductive fiber bundle and a non-conductive fiber are arranged around a lightning arrester in the third invention,
(a) is a schematic configuration diagram thereof, and (b) is a plan view thereof.

FIG. 4 is a schematic configuration diagram showing one embodiment of a lightning arrester according to a third invention.

FIG. 5A is a schematic configuration diagram showing a state in which a plurality of lightning arresters are stacked between metal fittings at both ends in the fourth invention, and FIG. 5B is a schematic diagram showing an embodiment of a lightning arrester according to the fourth invention; It is a block diagram.

FIG. 6 is a sectional view showing an example of a conventional lightning arrester.

[Explanation of symbols]

10: Lightning arrester, 11: Electrode fittings at both ends, 14: Jacket,
Reference numeral 20: non-conductive fiber bundle, 21: opening (pressure release hole), 22
... non-conductive fiber sleeve, 23 ... fiber strip, 30 ... non-conductive fiber bundle, 31 ... fiber strip, 32 ... non-conductive fiber,
33: pressure release hole, 50: formed plate, 51: formed ring, 52
... pressure release holes, 53 ... recesses, 54 ... grooves.

Continuation of the front page (72) Inventor Tohru Ando 2-56, Suda-cho, Mizuho-ku, Nagoya-shi, Aichi Japan Insulator Co., Ltd. F-term (reference) 5G331 AA01 BB07 BB31 BC08 CA04 CA05 DA02 EB07

Claims (10)

[Claims] 1. A plurality of lightning arresters made of a material having a non-linear voltage / current characteristic are stacked while applying an axial compressive force between the plurality of lightning arresters between electrode fittings at both ends by springs. A plurality of non-conductive fiber bundles are arranged in the axial direction at a predetermined interval between the element and both end fittings, and the non-conductive fiber bundles are fixed at both end fitting portions, and opened from the outer peripheral side of the non-conductive fiber bundle. A lightning arrester for power transmission characterized by being covered with a sleeve made of non-conductive fiber provided with a portion, and further covered with a jacket from the outer peripheral side of the sleeve made of non-conductive fiber. 2. The lightning arrester according to claim 1, wherein the non-conductive fiber bundle and the non-conductive fiber sleeve are impregnated with a resin. 3. The non-conductive fiber bundle and the non-conductive fiber sleeve are impregnated with resin after the non-conductive fiber bundle and the non-conductive fiber sleeve are disposed around the lightning arrester. Lightning arrester for power transmission. 4. A lightning arrester comprising a plurality of lightning arresters made of a material having a non-linear voltage / current characteristic, which are stacked while applying an axial compressive force between said plurality of lightning arresters between electrode fittings at both ends by means of a spring. A sleeve made of non-conductive fiber provided with an opening around the element and the metal fittings at both ends is covered, and a plurality of non-conductive fiber bundles are axially arranged at predetermined intervals on the outer peripheral side of the non-conductive fiber sleeve. A lightning arrester for power transmission, wherein the bundle of non-conductive fibers is fixed at metal fittings at both ends, and the outer periphery of the non-conductive fiber bundle is covered with a jacket. 5. The lightning arrester according to claim 4, wherein the non-conductive fiber bundle and the non-conductive fiber sleeve are impregnated with a resin. 6. The non-conductive fiber bundle and the non-conductive fiber sleeve are impregnated with a resin after the non-conductive fiber bundle and the non-conductive fiber sleeve are disposed around the lightning arrester. Lightning arrester for power transmission. 7. A lightning arrester comprising a plurality of lightning arresters made of a material having a non-linear voltage / current characteristic, being stacked while applying an axial compressive force between the plurality of lightning arresters by means of springs between electrode fittings at both ends. A plurality of non-conductive fiber bundles are arranged in the axial direction at predetermined intervals between the element and both-end metal fittings, and the non-conductive fiber bundles are fixed at both end metal fittings. A lightning arrester for power transmission, wherein a conductive fiber is wound in a radial direction, a pressure release hole is formed, and a non-conductive fiber is covered with a jacket from an outer peripheral side. 8. The lightning arrester according to claim 7, wherein the non-conductive fiber bundle and the non-conductive fiber are impregnated with a resin. 9. The lightning arrester for power transmission according to claim 7, wherein after the non-conductive fiber bundle and the non-conductive fiber are arranged around the lightning arrester, the non-conductive fiber bundle and the non-conductive fiber are impregnated with a resin. . 10. A plurality of lightning arresters made of a material having a non-linear voltage / current characteristic are stacked while applying an axial compressive force between the plurality of lightning arresters between electrode fittings at both ends by a spring. Between the element and the metal fittings at both ends, a plurality of molded plates formed by impregnating and curing the resin in the non-conductive fibers are arranged at predetermined intervals in the axial direction, and the resin is applied to the non-conductive fibers from the outer peripheral side of the molded plate. A molding ring formed by impregnation and curing is arranged in the radial direction to form a pressure release hole, and the molding plate is fixed at both ends of the metal fittings. A lightning arrester for power transmission characterized by being coated.