JPH08335417A - Insulation cylinder of lighting insulator and manufacture thereof - Google Patents

Abstract

PURPOSE: To prevent bursting of the whole body of an insulation cylinder, and increase residual strength after pressure discharge by setting the difference in strength of a pressure discharge part from other parts large, and quickly discharging inner pressure from the pressure discharge part when the inner pressure rises. CONSTITUTION: A fiber bundle 15 in which resin is impregnated is wound at a specified winding angle A1 to form an inner cylinder part 12. On an outer circumference of the inner cylinder part 12, the resin-impregnated fiber bundle 15 is wound at a winding angle A2 which is different from that in the inner cylinder part 12 to form an outer cylinder part 13. Pressure discharge holes 16 are formed in the cylinder part 12, 13 in which the winding angle A1, A2 of the fiber bundle 15 is the larger of the inner cylinder part 12 and the outer cylinder part 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightning insulator insulator tube and a method for manufacturing the same.

[0002]

2. Description of the Related Art Generally, a lightning arrester is installed on a power transmission line or a power distribution line in order to protect various devices from abnormal voltage such as lightning surge. In this type of lightning arrestor,
In an insulating cylinder made of FRP (fiber reinforced plastic),
A plurality of lightning protection devices having non-linear resistance characteristics are stacked and housed. Electrode fittings are attached to both ends of the insulating cylinder, and in this state, an insulating jacket is formed on the outer circumference of the insulating cylinder and both electrode fittings by a rubber mold or the like.

By the way, in this type of lightning protection insulator, when an unexpectedly large-scale lightning strike is received, the lightning protection element is destroyed and abnormally discharges to generate a high temperature and high pressure arc, and this arc causes a large amount of gas in the insulating cylinder. Occurs, and the internal pressure in the insulating cylinder rises sharply. For this reason, the insulating cylinder may be ruptured, the insulating jacket may be damaged, and the lightning protection element may be scattered around.

In order to deal with such a problem, an insulating cylinder having a structure as disclosed in, for example, Japanese Patent Laid-Open No. 6-139858 has been proposed. In this conventional configuration, a plurality of concave grooves are formed at predetermined intervals along the longitudinal direction on the inner peripheral surface of the main body of the insulating cylinder. Then, if the internal pressure suddenly rises due to an unexpected large-scale lightning strike, the thin portion of this groove is broken and the internal pressure is released to the outside, causing the entire insulating cylinder to bulge or burst. It is designed to prevent it.

[0005]

However, in this conventional configuration, the entire insulating cylinder is formed by winding a fiber bundle of glass fibers impregnated with resin at a constant winding angle by a filament winding method or the like. Has been formed.
Therefore, when the thin portion of the groove is broken and pressure is released, the crack generated in the thin portion spreads to the thick portion around the groove, reducing the mechanical strength of the insulating cylinder after pressure release. There was a risk of causing it.

Further, in this conventional insulating cylinder, the winding angle of the fiber bundle is set to a predetermined angle of about 30 degrees with respect to the axial direction so as to withstand the pressure at the time of releasing pressure. For this reason, the pressure resistance is improved even in the thin portion of the concave groove, and the internal pressure in the insulating cylinder rises when a high-temperature and high-pressure arc is generated, and the energy during pressure release increases.

Therefore, when the thin portion of the groove is broken and the pressure is released, the crack generated in the thin portion spreads to the thick portion around the groove, and the entire insulating cylinder ruptures and the There is a risk that the stored lightning protection device will be scattered around,
In addition, the residual strength of the insulating cylinder after releasing the pressure may be significantly reduced.

The present invention has been made by paying attention to the problems existing in such conventional techniques. Its main purpose is to ensure a large strength difference between the pressure relief part and other parts, and when the internal pressure rises, the inner pressure of the lightning insulator can be quickly released from the pressure relief part. To provide.

Another object of the present invention is to prevent lightning protection elements inside from being scattered around due to rupture of the entire insulating cylinder at the time of pressure release, and to increase the residual strength after pressure release. The purpose is to provide an insulating cylinder.

Still another object is to provide a manufacturing method suitable for manufacturing the insulating cylinder of the above-mentioned lightning protection insulator.

[0011]

[Means for Solving the Problems] In order to achieve the above-mentioned object, in the invention of the insulating cylinder of the lightning arrester according to claim 1, the resin-impregnated fiber bundle is arranged in the axial direction of the cylindrical portion. The inner cylinder is formed by winding at a predetermined winding angle, and the outer cylinder is formed on the outer periphery of the inner cylinder by winding a resin-impregnated fiber bundle at a winding angle different from that of the inner cylinder. Of the inner tubular portion and the outer tubular portion, the tubular portion with the larger winding angle of the fiber bundle is provided with a pressure release hole.

In the invention of the insulating cylinder of the lightning protection insulator according to claim 2, the fiber bundle impregnated with the resin is wound at a predetermined winding angle with respect to the axial direction of the cylindrical portion to form the inner cylindrical portion, and
A resin-impregnated fiber bundle is wound at a winding angle different from that of the inner tubular portion to form an outer tubular portion, and of the inner tubular portion and the outer tubular portion, the tube having the larger fiber bundle winding angle is provided. A hole for releasing pressure is formed in the part, and the inner cylinder part is fitted in the outer cylinder part.

According to the invention of the method for manufacturing an insulating cylinder of a lightning protection insulator described in claim 3, a resin bundle is impregnated on the outer periphery of the mandrel and the fiber bundle is wound at a predetermined winding angle with respect to the axial direction of the cylindrical portion. The tubular portion is formed, and then a fiber bundle in which the outer periphery of the inner tubular portion is impregnated with resin is wound at a winding angle different from that of the inner tubular portion to integrally form the outer tubular portion. The pressure releasing hole is formed in the tubular portion having the larger winding angle of the fiber bundle between the outer tubular portion and the outer tubular portion.

According to the invention of the method for manufacturing an insulating cylinder of a lightning protection insulator described in claim 4, a resin bundle is impregnated on the outer periphery of a mandrel and the fiber bundle is wound at a predetermined winding angle with respect to the axial direction of the cylindrical portion. Separately from this, a fiber bundle in which resin is impregnated on the outer circumference of the mandrel is wound at a winding angle different from that of the inner cylinder to form an outer cylinder, and the inner cylinder and outer cylinder are formed. Among the parts, a pressure release hole is formed in the tubular part having the larger winding angle of the fiber bundle, and then the inner tubular part is fitted and assembled in the outer tubular part.

[0015]

In the lightning insulator insulation cylinder according to the first and second aspects, the inner cylinder part and the outer cylinder part are formed by winding at different winding angles of the fiber bundle, and the cylinder part is wound in the axial direction. A pressure release hole is formed in the cylindrical portion having the larger angle. Therefore, the pressure releasing portion corresponding to the pressure releasing hole has a fragile thin-walled structure only in the tubular portion having a smaller winding angle of the fiber bundle, and the other portions have a tubular portion having a smaller winding angle of the fiber bundle. It has a strong two-layer structure with a large cylinder. Therefore, it is possible to secure a large difference in strength between the pressure releasing portion and other portions.

Therefore, in the lightning protection insulator using this insulating cylinder, when an arc is generated inside and the internal pressure rises rapidly, the pressure releasing portion is easily broken and the internal pressure is rapidly released to the outside. Also, during this pressure release, cracks generated in the pressure release part do not spread to the peripheral part of the pressure release part, and the energy during pressure release does not increase, so the entire insulating cylinder ruptures during pressure release. It is possible to prevent the lightning protection element and the like inside from scattering. Therefore, the residual strength of the insulating cylinder after releasing the pressure can be increased.

Furthermore, according to the manufacturing method of the third aspect, the insulating cylinder of the above-mentioned first aspect can be easily manufactured in accordance with a predetermined procedure. In addition, in the method according to the fourth aspect, since the inner cylinder portion and the outer cylinder portion are separately molded, it is possible to easily form the pressure release hole and the like.

[0018]

First Embodiment A first embodiment of the present invention will be described below with reference to FIGS. 1 to 5. 1 and 2 show the case where the present invention is applied to 77 KV, and an insulating cylinder 11 of this embodiment is formed integrally with an inner cylindrical portion 12 made of FRP (fiber reinforced plastic) and an outer periphery thereof. The outer cylinder portion 13 is made of FRP and has a hole for releasing pressure on its circumference. Then, in order to attach electrode fittings to both ends of the insulating cylinder 11, tapered portions 14 having a diameter gradually increasing toward the ends are formed.

The inner cylinder portion 12 is formed by winding a fiber bundle 15 such as glass fiber impregnated with a resin such as epoxy resin at a predetermined winding angle A1 with respect to the axial direction. In this embodiment, the inner cylinder portion 12 has a small winding angle A1 to facilitate pressure release, and the fiber bundle 15 extends substantially along the axial direction. Further, when the inner cylinder portion 12 releases the fiber bundle 15 such as glass fiber impregnated with a resin such as epoxy resin, the outer cylinder portion 13 provided with the pressure release hole is not damaged around the pressure release hole. In order to reduce the number, it is formed by winding at a winding angle A2 larger than the winding angle A1 of the inner cylindrical portion 12 with respect to the axial direction.

By the way, when the relationship between the winding angle of the fiber bundle 15 and the strength of the tubular portions 12 and 13 is confirmed by a test,
As the winding angle of the fiber bundle 15 increases, the strength against the internal pressure increases, but the tensile and bending strengths of the tubular portions 12 and 13 decrease, and the degree of decrease is remarkable when it exceeds about 20 degrees. It was

Therefore, in the present invention, the winding angle A1 of the inner cylindrical portion 12a is set within the range of 0 to 20 degrees,
It is desirable to set the winding angle A2 of the outer tubular portion 13 within the range of 20 to 60 degrees. The winding angle A of the inner cylindrical portion 12a
When the lightning protection insulator is mounted horizontally and a large bending load is applied to the insulating cylinder or when suppression of the amount of deflection is taken into consideration, 1 is preferably smaller, for example, the winding angle A1 is 0 degree. By the way, in the insulating cylinder 11 of this embodiment, the winding angle A1 of the inner cylindrical portion 12a is set to 5 degrees and the winding angle A2 of the outer cylindrical portion 13 is set to 30 degrees.

Further, of the inner tubular portion 12 and the outer tubular portion 13, the tubular portion having the larger winding angle of the fiber bundle 15, that is, the outer tubular portion 13, has four upper and lower cylinders, respectively. The individual holes 16 for releasing pressure are formed. These holes 16 are formed in the body portion on both sides excluding the intermediate portion of the outer tubular portion 13 at equal intervals and extend parallel to the axial direction. And each hole 1
In a portion corresponding to 6, a thin wall pressure release portion 17 including only the inner tubular portion 12 having a small winding angle A1 of the fiber bundle 15 is formed.

By the way, in this embodiment, the thickness of the inner cylinder portion 12 is set to about 1.0 mm, and the thickness of the outer cylinder portion 13 is set to about 3.0 mm. The pressure releasing holes 16 are formed so as to slightly cut the outer peripheral surface of the inner cylindrical portion 12 from the outer peripheral surface of the outer cylindrical portion 13, and the thickness of the pressure releasing portion 17 is set to be approximately 1.0 mm. Has been done.

When the lightning insulator is assembled by using the insulating cylinder 11 thus constructed, as shown in FIG. 3, an insulating jacket 22 is formed on the outer circumference of the insulating cylinder 11 by a rubber mold or the like. Insulating filler 2 formed in the insulating cylinder 11
A plurality of lightning protection devices 21 having a non-linear resistance characteristic are housed in a laminated manner with a value of 0. Then, electrode fittings (not shown) are attached to both ends of the insulating cylinder 11.

When this lightning protection insulator is installed in a power transmission line or a distribution line and receives an unexpected large-scale lightning strike, the lightning protection element 21 abnormally discharges to generate a high temperature and high voltage arc. A large amount of gas is generated in the insulating cylinder 11 by this arc, and the internal pressure of the insulating cylinder 11 rapidly rises.

At this time, the pressure releasing portion 17 corresponding to the pressure releasing hole 16 in the insulating cylinder 11 has a winding angle A of the fiber bundle 15.
1 has a fragile thin-walled structure having only a small inner cylindrical portion 12. On the other hand, the other parts of the insulating cylinder 11 are the inner cylinder part 12 with a small winding angle A1 of the fiber bundle 15,
It has a strong two-layer structure with the outer cylinder portion 13 having a large winding angle A2 that is excellent in withstanding pressure against an increase in internal pressure. For this reason, a large difference in strength occurs between the pressure release portion 17 of the insulating cylinder 11 and other portions.

Therefore, when the internal pressure of the insulating cylinder 11 rapidly rises as described above, the thin-walled pressure releasing portion 17 is easily broken and the internal pressure is quickly released to the outside. Growth is suppressed. Further, at the time of this pressure release, there is a large strength difference between the pressure release portion 17 and other portions, so that cracks generated in the pressure release portion 17 may spread to the peripheral portion of the pressure release portion 17. Absent. Therefore, it is possible to prevent the internal lightning protection element 21 and the like from scattering around due to the rupture of the entire insulating cylinder 11.
It is possible to secure a high residual strength of the insulating cylinder 11 after the pressure is released.

Next, the insulating cylinder 11 constructed as described above.
The manufacturing method of will be described. When manufacturing the insulating cylinder 11, for example, a manufacturing apparatus as shown in FIG. 4 is used. In this manufacturing apparatus, the mandrel 25
Is rotatably arranged, and a large number of pins 2 are provided on the outer circumference of both ends.
6 is projected. A supply nozzle 27 is arranged on the outer periphery of the mandrel 25 so as to be capable of reciprocating in the axial direction, and the fiber bundle 15 impregnated with a resin 29 in a resin tank 28 is
The mandrel 25 is supplied from the supply nozzle 27.

First, the mandrel 25 is rotated intermittently or at a low speed, and the supply nozzle 27 is reciprocally moved to wind the fiber bundle 15 impregnated with the resin 29 around the mandrel 25 at a small winding angle A1. , Fig. 6
The inner cylindrical portion 12 is formed as shown in FIG. In this case, both ends of the fiber bundle 15 are locked to the pins 26. next,
The mandrel 25 is rotated at a higher speed than when the inner cylinder portion 12 is formed, and the supply nozzle 27 is reciprocally moved, so that the fiber bundle 15 in which the outer periphery of the inner cylinder portion 12 is impregnated with the resin 29 is formed. The winding is performed at a winding angle A2 larger than the winding angle A1, and the outer cylinder portion 13 is formed as shown in FIG. 5B.

In this state, the inner tubular portion 12 and the outer tubular portion 13 are heated to a predetermined temperature and hardened. After that, a plurality of pressure-releasing holes 1 are formed in the outer cylinder portion 13 having a large winding angle A2 of the fiber bundle 15.
6 is processed and formed, whereby a thin-walled pressure-release portion 17 including only the inner cylinder portion 12 having a small winding angle A1 of the fiber bundle 15 is formed in a portion corresponding to each pressure-release hole 16.

Therefore, according to this manufacturing method, the fiber bundle 1
It is possible to easily and continuously manufacture the insulating cylinder 11 of the first embodiment having a two-layer structure of the inner cylinder portion 11 and the outer cylinder portion 13 having different winding angles.

[0032]

Another Embodiment Next, a second embodiment of the present invention will be described with reference to FIG.
And FIG. 7 will be described. Now, in the insulating cylinder 11 of the second embodiment, as shown in FIG.
Inner tube portion 12 and outer tube portion 1 having different winding angles A1 and A2
3 is formed separately, and the outer cylinder part 1 having a large winding angle A2
3, a plurality of pressure releasing holes 16 are formed. Then, the insulating cylinder 11 is formed by inserting the inner cylinder portion 12 into the outer cylinder portion 13, and in this state, the insulating cylinder 11 is formed in a portion where the winding angle A1 of the fiber bundle 15 is small at a portion corresponding to each pressure release hole 16. A thin-walled pressure release portion 17 including only the tubular portion 12 is formed.

Therefore, also in the insulating cylinder 11 of the second embodiment, it is possible to secure a large difference in strength between the pressure releasing portion 17 and other portions, as in the first embodiment described above.
When the internal pressure of the insulating cylinder 11 rises in a state where it is assembled to the lightning protection insulator, the internal pressure can be quickly released from the pressure release portion 17. Further, during this pressure release, it is possible to prevent the lightning protection element 21 and the like inside from being scattered around due to the rupture of the entire insulating cylinder 11, and it is possible to increase the residual strength of the insulating cylinder 11 after the pressure is released.

Next, a method of manufacturing the insulating cylinder 11 of the second embodiment will be described. When manufacturing the insulating cylinder 11, first, the mandrel 25 is rotated intermittently or at a low speed, and the supply nozzle 27 is reciprocated, so that the outer periphery of the mandrel 25 is impregnated with the resin 29. It is wound at a small winding angle A1 to form the inner cylinder portion 12 as shown in FIG. Then, the inner cylindrical portion 12 is heated to a predetermined temperature and hardened.

Separately from this, mandrels 2 having different outer diameters
5 is rotated at a higher speed than when the inner cylindrical portion 12 is formed, and the supply nozzle 27 is reciprocated to move the mandrel 25.
The fiber bundle 15 in which the resin 29 is impregnated on the outer periphery of the inner cylindrical portion 12
The winding angle A2 is larger than the winding angle A1. As a result, as shown in FIG.
Is formed separately from the inner cylindrical portion 12. Then, the outer cylinder portion 13 is heated to a predetermined temperature and hardened.

Thereafter, as shown in FIG. 7 (c), a plurality of pressure releasing holes 16 are previously formed in the outer cylinder portion 13 of the fiber bundle 15 having a large winding angle A2. In this state,
As shown in (d), the inner tubular portion 12 is fitted and assembled in the outer tubular portion 13, and the inner tubular portion 12 having a small winding angle A1 of the fiber bundle 15 is provided at a portion corresponding to each pressure release hole 16. The thin pressure release portion 17 is formed of only.

Therefore, according to this manufacturing method, the fiber bundle 1
It is possible to easily and continuously manufacture the insulating cylinder 11 of the second embodiment having the assembly structure of the inner cylinder portion 11 and the outer cylinder portion 13 having different winding angles of 5. In addition, according to this method, it is possible to easily form the pressure release hole 16 in the outer cylindrical portion 13 by penetrating it.

The present invention may be modified and embodied as follows. (A) Contrary to each of the above-described embodiments, the fiber bundle 15 of the inner tubular portion 12
The winding angle A1 of A is the winding angle A of the fiber bundle 15 of the outer tubular portion 13.
It is formed so as to be larger than 2, and the hole 16 for releasing pressure is formed in the inner cylindrical portion 12. (B) As the fiber bundle 15, in addition to the glass fiber of the above-mentioned embodiment, use aramid fiber or ceramic fiber. (C) As the resin 29 with which the fiber bundle 15 is impregnated, in addition to the epoxy resin of the above embodiment, a silicone resin or a fluorine resin is used.

Further, the technical idea understood from the above embodiment will be described below. (1) The insulating cylinder of the lightning protection insulator according to claim 1, wherein the pressure releasing holes are formed at a plurality of predetermined intervals so as to extend in the axial direction of the cylindrical portion. According to this structure, the pressure release at the time of lightning can be facilitated, and the strength of the insulating cylinder after the pressure release can be maintained. (2) The lightning arrester according to claim 1 or 2, wherein the winding angle of the inner tubular portion is set within a range of 0 to 20 degrees, and the winding angle of the outer tubular portion is set within a range of 20 to 60 degrees. Insulator insulation tube. With this configuration, the pressure can be released easily and the residual strength of the insulating cylinder can be maintained. (3) The wall thickness of the tubular portion having a smaller winding angle of the fiber bundle is made thinner than the wall thickness of the tubular portion having a large winding angle of the fiber bundle in which the pressure release holes are formed. Insulation insulator of lightning protection insulator. With this configuration, the pressure can be easily released from the pressure release hole, and the strength of the insulating cylinder can be maintained.

[0040]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, it has the following effects. According to the first and second aspects of the present invention, a large difference in strength between the pressure relief portion and the other portion can be secured, and when the internal pressure rises, the internal pressure is promptly increased from the pressure relief portion. Can be released.

According to the first and second aspects of the present invention, it is possible to prevent the lightning protection element inside from being scattered around due to the rupture of the entire insulating cylinder during pressure release. The residual strength after pressure release can also be increased.

Further, according to the invention described in claims 3 and 4, the above-described insulating cylinder of the lightning protection insulator can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a first embodiment of an insulating cylinder of the present invention.

FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG.

FIG. 3 is a partial cross-sectional view of a lightning protection insulator using the insulating cylinder.

FIG. 4 is a schematic view showing an apparatus for manufacturing the insulating cylinder.

FIG. 5 is a front view showing a method of manufacturing the insulating cylinder in order.

FIG. 6 is an exploded sectional view showing a second embodiment of the insulating cylinder of the present invention.

FIG. 7 is a front view showing the method of manufacturing the insulating cylinder in order.

[Explanation of symbols]

11 ... Insulation cylinder, 12 ... Inner cylinder part, 13 ... Outer cylinder part, 15 ... Fiber bundle, 16 ... Pressure release hole, 17 ... Pressure release part, 25 ... Mandrel, 29 ... Resin, A1, A2 ... Fiber bundle Winding angle.

Claims (4)

[Claims] 1. A fiber bundle impregnated with a resin is wound at a predetermined winding angle with respect to the axial direction of the tubular portion to form an inner tubular portion, and the resin-impregnated fiber is formed on the outer periphery of the inner tubular portion. The bundle is wound at a winding angle different from that of the inner tubular portion to form an outer tubular portion. Of the inner tubular portion and the outer tubular portion, the tubular portion with the larger winding angle of the fiber bundle is for releasing pressure. A lightning insulator insulator tube with a hole. 2. A fiber bundle impregnated with a resin is wound at a predetermined winding angle with respect to the axial direction of the tubular portion to form an inner tubular portion, and the fiber bundle impregnated with the resin is different from the inner tubular portion. An outer cylinder is formed by winding at a winding angle, and a pressure releasing hole is formed in the cylinder of the inner cylinder and the outer cylinder having the larger winding angle of the fiber bundle. Insulation tube of lightning insulator with the outer tube fitted inside. 3. An inner cylinder is formed by winding a resin-impregnated fiber bundle on the outer circumference of the mandrel at a predetermined winding angle with respect to the axial direction of the cylinder, and then forming a resin on the outer circumference of the inner cylinder. The fiber bundle impregnated with is wound at a winding angle different from that of the inner tubular portion to integrally form the outer tubular portion, and thereafter, the winding angle of the fiber bundle among the inner tubular portion and the outer tubular portion is A method for manufacturing an insulating cylinder for a lightning insulator, in which a pressure release hole is formed in a larger cylinder. 4. An inner cylinder is formed by winding a resin-impregnated fiber bundle on the outer circumference of the mandrel at a predetermined winding angle with respect to the axial direction of the cylinder, and separately from this, a resin is formed on the outer circumference of the mandrel. The fiber bundle impregnated with is wound at a winding angle different from that of the inner tubular portion to form an outer tubular portion, and of the inner tubular portion and the outer tubular portion, the tube having the larger winding angle of the fiber bundle is provided. A method for manufacturing an insulating cylinder of a lightning protection insulator, wherein a pressure release hole is formed in a portion, and then the inner cylinder portion is fitted and assembled in the outer cylinder portion.