JP2013005681A - Bird injury prevention device for overhead wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bird injury prevention device for an overhead wire capable of preventing corrosion of an overhead wire at an attachment part of a jumper device.SOLUTION: The bird injury prevention device for the overhead wire 10 includes a silicone rubber-made tubular insulator 11 of a tubular part having a plurality of projections 111 in an inner face thereof to form a gap with the overhead wire 1 attached in a peripheral of the overhead wire 1, such as a steel core aluminum twisted wire(ACSR), aluminum covered steel core aluminum twisted wire(ACSR/AC), and at least one silicone rubber-made drain tube 12 for discharging water staying inside the tubular insulator 11.

Description

  The present invention relates to a bird damage prevention apparatus (bird damage prevention apparatus) for an overhead electric wire, and more particularly to a bird damage prevention apparatus capable of preventing corrosion of an overhead electric wire in a mounting portion such as a jumper device.

  An overhead bare wire (an overhead wire, a jumper wire), which is a component of the jumper device, is installed in close proximity to a supporting steel tower. A ground fault may occur between the two.

  As a conventional method for preventing this ground fault, many methods have been proposed in which a jumper wire is coated with an insulating material as shown in the front view of FIG. 4 and the cross-sectional view of FIG. 5 or the cross-sectional view of FIG. FIG. 5 shows the tubular structure shown in FIG. By attaching the insulating cover 21 (bird damage prevention apparatus for overhead electric wires) or by attaching the insulating tape layer 31 (overhead wire bird damage prevention apparatus) in which the insulating tape of FIG. The insulation of the overhead electric wire 1 is achieved, and ground faults of the overhead electric wire due to the birds and animals and the nesting members of the birds and animals are prevented.

  In Patent Document 1, in order to prevent grounding accidents of overhead electric wires (jumper wires) and jumper wires equipped with bird harm prevention devices to prevent corrosion at the mounting portion, serrated projections are provided on both sides in the longitudinal direction. Bird damage that prevents rainwater from staying between the insulation sheet and the jumper wire by rolling the insulation sheet around the jumper wire and lifting the middle part of the insulation sheet and the jumper wire upward with a suspended insulator chain A prevention jumper device is disclosed.

  In Patent Document 2, an insulation space is formed between the inner surface of the tubular insulator and the outer surface of the overhead electric wire in order to maintain the effect of preventing a ground fault even if the insulation breakdown in the thickness direction of the tubular insulator occurs. An avian damage prevention insulation cover is disclosed.

  In Patent Document 3, in order to prevent damage to the optical cable wound in the longitudinal direction of the outer periphery of the overhead wire, a plurality of ring-shaped fixing members attached to the outer periphery of the overhead wire and the outer periphery of the ring-shaped fixing member are engaged. In addition, a bird damage prevention apparatus including a cylindrical rotating body attached rotatably is disclosed.

  Patent Document 4 discloses an electric wire protective cover having a width that can be wound at least twice around the outer periphery of an electric wire to be covered with an extrusion-molded product of silicone rubber in order to facilitate the covering and covering operation on the electric wire. ing.

  Patent Document 5 discloses a bird harm prevention insulating device in which a gap for drainage of rainwater is formed between an insulating sheet and a bare wire in order to improve heat dissipation characteristics and corrosion resistance of the bare wire.

Japanese Patent Laid-Open No. 5-260633 JP 2000-92672 A JP 2003-284227 A JP 2004-72809 A Japanese Utility Model Publication No. 5-74131

  And when the conventional overhead wires as described above are laid in the coastal zone or industrial zone, corrosion occurs due to sea salt particles, SOx gas, NOx gas, etc. existing in the surrounding environment. There is a case.

  In recent years, it has also been pointed out that corrosion also develops in other regions than the above due to the influence of acid rain due to changes in the global environment. As described above, moisture containing corrosive substances invades the gap between the conventional bird damage prevention device and the overhead wire due to the installation environment of the overhead wire and the weather conditions such as the post-laying weather conditions. It may stay between the prevention device and the overhead wire.

  FIG. 7 shows a state in which water has accumulated in the overhead wire electric bird damage prevention apparatus shown in FIG. 5, but the gap formed between the overhead electric wire bird damage prevention device 5 and the overhead electric wire 1 is not bird damage. Since the prevention device 5 and the conductor 3 of the outermost layer of the overhead wire 1 are always in contact with each other, the gap is extremely small, and the overhead wire 1 and the moisture 4 containing a corrosive substance are in contact for a long time. Will continue to do. As a result, the overhead wire 1 of the mounting portion to which the bird damage prevention device 5 is attached has a problem that the corrosion progress rate is accelerated as compared to the overhead wire 1 other than the mounting portion. Moreover, when an overhead electric wire corrodes, the mechanical characteristic and electrical characteristic will fall, and it will become difficult to supply electric power stably. If corrosion further develops, the overhead electric wire may break and power transmission may become impossible.

  Accordingly, an object of the present invention is to provide a bird damage prevention device for an overhead wire that prevents corrosion of an overhead wire attached to a mounting part such as a jumper device and prevents ground faults caused by birds and beasts at the attachment part. It is to provide.

  In order to prevent corrosion at the mounting part of the bird damage prevention device for the overhead electric wire, the present inventors have investigated and analyzed the actual corrosion situation in the real environment in detail, and based on these, the bird damage prevention device for the overhead wire This leads to the present invention in which the insulating material, the thickness, the distance (gap) from the overhead electric wire, etc. are defined.

  In order to achieve the above object, the present invention provides a steel core portion of a galvanized steel wire or an aluminum-coated steel wire, and a conductor portion in which a plurality of aluminum wires or aluminum alloy wires are twisted around the outer periphery of the steel core portion. In the bird's damage prevention apparatus for an overhead electric wire mounted around the overhead electric wire composed of the above, a tubular portion made of silicone rubber having a plurality of protrusions on the inner surface and forming a gap with the overhead electric wire There is provided a bird injury prevention apparatus for an overhead electric wire, comprising: a tubular insulator; and at least one drainage pipe made of silicone rubber that discharges moisture accumulated in the tubular insulator.

  The thickness of the tubular portion of the tubular insulator is preferably 1 mm or more and 8 mm or less.

  The length of the gap formed between the tubular portion and the overhead electric wire by the protrusion of the tubular insulator is preferably 3 mm or more and 20 mm or less.

  According to the above configuration, since the gap is formed between the inner surface of the tubular portion and the overhead electric wire by the protruding portion of the tubular insulator, the moisture that has entered the inside of the tubular insulator or the moisture that has accumulated inside and the overhead electric wire And the provision of a water drain tube can prevent corrosion by further improving the drainage and air permeability of the overhead electric wire in the device section. In addition, it is possible to prevent a ground fault caused by birds and beasts at the wearing part. Furthermore, since the entire device is made of a flexible silicone rubber insulating material, it can follow flexibly according to the installation status of the overhead wire, and can always maintain the state in which the protrusion is in contact with the overhead wire. . In addition, if transparent silicone rubber is used, it is possible to easily observe the state of drainage and the state of residence from the outside.

  ADVANTAGE OF THE INVENTION According to this invention, while preventing the corrosion of the overhead electric wire with which mounting parts, such as a jumper apparatus, are prevented, the ground fault accident by the birds and beasts in a mounting part is possible.

FIG. 1 is a front view showing an example of the appearance of an overhead wire electric bird damage prevention apparatus according to an embodiment of the present invention. 2 schematically shows a cross-sectional structure of the bird's damage prevention apparatus for overhead wires shown in FIG. 1, FIG. 2 (a) is a cross-sectional view taken along line AA in FIG. 1, and FIG. 2 (b) is FIG. It is BB sectional drawing in FIG. FIG. 3 shows a state where water has entered between the overhead wire electrical damage control apparatus shown in FIG. 1 and the overhead wire, and FIG. 3A is a cross-sectional view taken along line AA in FIG. b) is a sectional view taken along line BB in FIG. FIG. 4 is a front view showing an appearance of a conventional bird damage prevention apparatus for overhead electric wires. FIG. 5 is a cross-sectional view of the bird damage prevention apparatus for overhead electric wires shown in FIG. FIG. 6 is a cross-sectional view of another example of a conventional bird damage prevention apparatus for an overhead electric wire. FIG. 7 is a cross-sectional view showing a state where water is retained in the overhead wire electric bird damage prevention apparatus shown in FIG. 5.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in each figure, about the component which has the substantially same function, the same code | symbol is attached | subjected and the duplicate description is abbreviate | omitted.

  FIG. 1 is a front view showing an example of the appearance of an overhead wire electric bird damage prevention apparatus according to an embodiment of the present invention. 2 schematically shows a cross-sectional structure of the bird's damage prevention apparatus for overhead wires shown in FIG. 1, FIG. 2 (a) is a cross-sectional view taken along line AA in FIG. 1, and FIG. 2 (b) is FIG. It is BB sectional drawing in FIG.

  As shown in FIG. 1, this overhead wire bird damage prevention apparatus 10 is provided with a tubular insulator 11 attached to the periphery of the overhead wire 1, and discharges moisture in the tubular insulator 11 provided on the tubular insulator 11. And a water drain pipe 12 for the purpose. The tubular insulator 11 is made of a flexible silicone rubber insulating material. Further, it may be transparent.

  The drain pipe 12 is provided at a location where moisture stays. In the present embodiment, the drain pipe 12 is provided at one place, but it may be provided at a plurality of places where moisture tends to stay depending on the installation situation of the overhead electric wire (jumper wire) 1. The drain pipe 12 has a length that protrudes from the tubular portion 110. The drain pipe 12 is made of a silicone rubber insulating material having the same flexibility as the tubular insulator 11. It may have transparency. The tubular insulator 11 and the water drain tube 12 are firmly bonded with, for example, a normal temperature curable silicone resin adhesive. The tubular insulator 11 and the drain pipe 12 are divided structures in the present embodiment, but may be integrally formed.

  As shown in FIG. 2, the overhead electric wire 1 includes, for example, a steel core portion 2 formed by twisting a plurality of galvanized steel wires or aluminum-coated steel wires functioning as tension members at the center portion, and the steel core portion 2. A conductor portion 3 in which a plurality of aluminum strands or aluminum alloy strands are twisted is arranged on the outer periphery of the wire.

  As shown in FIG. 2, the tubular insulator 11 includes a tubular portion 110 and a plurality of protrusions 111 provided on the inner surface of the tubular portion 110 so as to be directed toward the center. The protrusion 111 forms a gap 13 between the tubular insulator 11 and the overhead electric wire 1. The shape of the protrusion 111 is a rectangular shape having a constant width in the present embodiment, but may be another shape such as a semicircular shape. The number of the protrusions 111 is not particularly specified, and may be set to an appropriate number based on the manufacturability of the bird harm prevention apparatus 10 and the corrosion prevention effect of the overhead electric wire 1. Moreover, although the tubular part 110 and the projection part 111 are integrally molded, division | segmentation molding may be sufficient.

  The thickness of the tubular portion 110 of the tubular insulator 11 is preferably 1 mm or more and 8 mm or less. If the thickness of the tubular portion 110 is less than 1 mm, the insulation characteristics are insufficient, and it is difficult to obtain a desired bird damage prevention effect (ground fault accident prevention effect). Moreover, when the thickness of the tubular part 110 exceeds 8 mm, it will become a problem in the point of a weight increase and a product cost increase. Therefore, the thickness of the tubular portion 110 is preferably 1 mm or more and 8 mm or less.

The length of the gap 13 formed between the tubular portion 110 and the overhead electric wire 1 by the projection 111, that is, the height of the projection 111 is preferably 3 mm or more and 20 mm or less. If the length of the gap 13, that is, the height of the protrusion 111 is less than 3 mm, the effect of suppressing the contact between the moisture that has entered the bird damage prevention apparatus 10 and the overhead wire 1, the bird damage prevention apparatus 10 and the overhead wire 1. The water drainage and air permeability between the two are not sufficient, and it is difficult to obtain the desired effect of inhibiting corrosion. Moreover, even if the length of the gap 13, that is, the height of the protrusion 111 exceeds 20 mm, the corrosion inhibiting effect remains almost constant. However, unnecessarily increasing the length of the gap 13 is not preferable in terms of wind pressure characteristics. Therefore, the length of the gap 13 formed between the tubular portion 110 and the overhead electric wire 1 by the protrusion 111 is preferably 3 mm or more and 20 mm or less.

  The tubular insulator 11 configured as described above can be formed by, for example, extrusion molding. Moreover, the tubular insulator 11 may be configured so as to be closed by the elasticity of the material when wound around the overhead electric wire 1 to be tubular. In this case, after attaching the tubular insulator 11 to the overhead electric wire 1 from the front, the butted portions (not shown) of the end faces are joined to each other with an adhesive, for example, a room temperature curable silicone resin, and attached to the overhead electric wire 1. The tubular insulator 11 may have a split structure, and an adhesive may be used for bonding between them, or a screw may be used.

  FIG. 3 shows a state where water has entered between the overhead wire electrical damage control apparatus shown in FIG. 1 and the overhead wire, and FIG. 3A is a cross-sectional view taken along line AA in FIG. b) is a sectional view taken along line BB in FIG.

  Since the gap 111 is formed between the tubular insulator 11 and the overhead electric wire 1 by the protrusion 111, the moisture 4 that has entered the inside of the tubular insulator 11 is prevented from contacting the overhead electric wire 1 and drained. In this structure, the moisture 4 remaining from 12 or the moisture 4 to be retained is discharged to the outside.

(Effect of this embodiment)
According to the bird damage prevention apparatus for an overhead electric wire of the present embodiment, the following effects can be obtained.
(1) Since the gap 13 is formed between the inner surface of the tubular portion 110 and the overhead wire 1 by the projection 111 of the tubular insulator 11, the moisture 4 and the overhead wire 1 that have entered the inside of the tubular insulator 11 are formed. It becomes difficult to touch.
(2) Moreover, by providing the drain pipe 12, the drainage property and the air permeability of the overhead electric wire 1 in the device section are enhanced. As a result, it is possible to significantly suppress the corrosion of the overhead electric wire in the bird damage prevention device mounting portion as compared with the conventional case, and it is possible to extend the life of the overhead electric wire significantly.
(3) Further, it is possible to prevent a ground fault of an overhead electric wire due to the birds and beasts and the nesting members in the mounting portion of the apparatus 10.
(4) Since the entire device 10 is made of a flexible silicone rubber insulating material, it can flexibly follow the installation condition of the overhead electric wire 1 and the projection is always in contact with the overhead electric wire. Can hold state.
(5) If transparent silicone rubber is used for the device 10, the drainage state, the staying state, etc. can be easily observed from the outside.

  Hereinafter, an embodiment of the bird harm prevention apparatus for overhead electric wires according to the present invention will be described.

Example 1
Example 1 is made of silicone rubber having a volume resistivity of 5 × 10 ¹⁶ Ω · cm, a tubular insulator 11 having a thickness of the tubular portion 110 of 1.0 mm and a height of the protruding portion 111 of 3.0 mm, and A tubular cover 10 was produced as a bird damage prevention apparatus 10 for an overhead electric wire having a total length of 4 m comprising a drain pipe 12. After covering this tubular cover 10 so that a conductive portion having a conductor effective cross-sectional area of 410 mm ² as an overhead electric wire 1 having a length of 5 m is provided in a steel core aluminum stranded wire (ACSR) composed of two layers of inner and outer layers, a tubular portion is formed. A drain pipe 12 having an inner diameter of 10 mm made of silicone rubber made of the same material as that of the tubular cover is provided at one central portion in the cover longitudinal direction where moisture in the cover 10 stays. Next, both butt portions of the tubular cover are set to room temperature curable silicone resin so that the length of the gap 13 between the tubular cover 10 and the steel core aluminum stranded wire 1 (height of the protruding portion 111) is 3.0 mm. The bird's damage prevention apparatus 10 for overhead wires was attached to the overhead wire 1 by joining with the above.

(Examples 2 to 4)
In Examples 2 to 4, the thickness of the tubular portion 110 is different from that in Example 1, and the other configurations are the same as those in Example 1. The thickness of the tubular portion 110 was 3.5 mm in Example 2, 5.5 mm in Example 3, and 8.0 mm in Example 4.

(Example 5)
In the fifth embodiment, the height of the protrusion 111 (the length of the gap 13) is 12.0 mm, which is higher than that of the first embodiment, and the other configuration is the same as that of the first embodiment.

(Examples 6 to 8)
In Examples 6-8, the thickness of the tubular portion 110 is different from that in Example 5, and the other configurations are the same as those in Example 5. The thickness of the tubular portion 110 was 4.0 mm in Example 6, 6.5 mm in Example 7, and 8.0 mm in Example 8.

Example 9
In the ninth embodiment, the height of the protrusion 111 (the length of the gap 13) is 20.0 mm, which is higher than that of the first embodiment, and the other configuration is the same as that of the first embodiment.

(Examples 10 to 12)
In Examples 10 to 12, the thickness of the tubular portion 110 is different from that in Example 9, and the other configurations are the same as those in Example 5. The thickness of the tubular portion 110 was 4.5 mm in Example 10, 6.0 mm in Example 11, and 8.0 mm in Example 12.

(Comparative Example 1)
In Comparative Example 1, the thickness of the tubular portion 110 is 0.7 mm thinner than those of Examples 1 to 12, and the height of the protrusion 111 (the length of the gap 13) is 0.5 mm lower than those of Examples 1 to 12. The others are configured in the same manner as in Examples 1-12.

(Comparative Example 2)
In Comparative Example 2, the height of the protruding portion 111 (the length of the gap 13) is 1.0 mm, which is lower than those of Examples 1 to 12, and the thickness of the tubular portion 110 is 4.0 mm. It is comprised similarly to Examples 1-12.

(Comparative Example 3)
In Comparative Example 3, the height of the protruding portion 111 (the length of the gap 13) is set to 2.0 mm, which is lower than those of Examples 1 to 12, and the thickness of the tubular portion 110 is set to 7.0 mm. It is comprised similarly to Examples 1-12.

(Comparative Example 4)
In Comparative Example 4, the height of the protruding portion 111 (the length of the gap 13) is 2.5 mm, which is lower than those of Examples 1 to 12, and the thickness of the tubular portion 110 is 9.5 mm. It is comprised similarly to Examples 1-12.

(Comparative Example 5)
In Comparative Example 5, the thickness of the tubular portion 110 is 0.5 mm, which is thinner than those of Examples 1 to 12, and the height of the protrusion 111 (the length of the gap 13) is 4.0 mm. It is comprised similarly to Examples 1-12.

(Comparative Example 6)
In Comparative Example 6, the thickness of the tubular portion 110 is 8.5 mm, which is thicker than those of Examples 1 to 12, and the height of the protruding portion 111 (the length of the gap 13) is 8.0 mm. It is comprised similarly to Examples 1-12.

(Comparative Example 7)
In Comparative Example 7, the thickness of the tubular portion 110 is 0.8 mm, which is thinner than those of Examples 1 to 12, and the height of the protruding portion 111 (the length of the gap 13) is 14.0 mm. It is comprised similarly to Examples 1-12.

(Comparative Example 8)
In Comparative Example 8, the thickness of the tubular portion 110 is set to 9.0 mm, which is thicker than those of Examples 1 to 12, and the height of the protruding portion 111 (the length of the gap 13) is set to 16.0 mm. It is comprised similarly to Examples 1-12.

(Comparative Example 9)
In Comparative Example 9, the thickness of the tubular portion 110 is 0.7 mm, which is thinner than those of Examples 1 to 12, and the height of the protrusion 111 (the length of the gap 13) is 22.0 mm, which is higher than those of Examples 1 to 12. The others are configured in the same manner as in Examples 1-12.

(Comparative Example 10)
In Comparative Example 10, the height of the protruding portion 111 (the length of the gap 13) is 24.0 mm, which is higher than those of Examples 1 to 12, and the thickness of the tubular portion 110 is 3.5 mm. The configuration is the same as in the first embodiment.

(Comparative Example 11)
In Comparative Example 11, the height of the protrusion 111 (the length of the gap 13) is 21.0 mm, which is higher than those in Examples 1 to 12, and the thickness of the tubular portion 110 is 5.5 mm. It is comprised similarly to Examples 1-12.

(Comparative Example 12)
In Comparative Example 12, the height of the protrusion 111 (the length of the gap 13) is 20.5 mm, which is higher than those of Examples 1 to 12, and the thickness of the tubular portion 110 is 8.5 mm. It is comprised similarly to Examples 1-12.

(Conventional example 1)
Conventional Example 1 is made of silicone rubber having a volume resistivity of 5 × 10 ¹⁶ Ω · cm, the thickness of the tubular portion 110 is 4.0 mm, the tubular insulator 11 without the projection 111, and the whole without the drain tube 12. A tubular cover 10 having a length of 4 m was produced. After the tubular cover 10 is tightly covered with a steel core aluminum stranded wire (ACSR) composed of two layers of inner and outer layers, a conductive portion having a conductor effective cross-sectional area of 410 mm ² as an overhead electric wire 1 having a length of 5 m, A tubular cover (bird damage prevention device 10 for overhead wires) was attached to the overhead wire 1 by bonding with a room temperature curable silicone resin.

(Conventional example 2)
Conventional Example 2 is a tape cover made of an ethylene propylene tape having a volume resistivity of 2.5 × 10 ¹⁶ Ω · cm spirally having a thickness of 4.0 mm, and an effective conductor sectional area of 410 mm as an overhead electric wire 1 having a length of 5 m. ^Two conductive parts were tightly covered with a steel core aluminum stranded wire (ACSR) composed of two layers of inner and outer layers, and the overhead wire 1 (tape cover) was equipped with a bird damage prevention device for the overhead wire.

  Various characteristics evaluation was implemented about the overhead electric wire equipped with the bird damage prevention apparatus for each overhead electric wire of said Example, a comparative example, and a prior art example.

(Insulation characteristics evaluation method)
First, each insulation breakdown voltage value was measured as an insulation characteristic. An electric wire sample equipped with an aerial wire bird damage prevention device was installed horizontally, the wire body was attached with a high voltage electrode, and an aluminum foil was attached to the bird damage prevention device, which was used as a ground electrode. An AC voltage is applied between the electric wire and the bird protection device under non-staining and dry conditions on the surface, the bird protection device breaks down, and the voltage value when current flows through the circuit is measured as the breakdown voltage value. did. The insulation characteristics were evaluated as “◯” when the ground voltage of the 77 kV transmission line exceeded the ground voltage (44.5 kV), and “x” when the dielectric breakdown occurred before reaching the ground voltage.

(Evaluation method for corrosion resistance)
Next, the corrosion resistance characteristic of the electric wire in the attachment part of the bird damage prevention apparatus for an overhead electric wire was evaluated by the corrosion acceleration experiment. In the corrosion acceleration experiment, the wires equipped with various bird harm prevention devices were installed with the slackness of about 1.5 m between the support points 3 m and the drainage pipe attached to the bird harm prevention device located at the lowest point, Under the condition that current is passed through a transformer so that the wire temperature is 90 ° C., an electrolyte solution adjusted to pH 4 by adding sulfuric acid to a 5% by weight sodium chloride aqueous solution is sprayed for 30 minutes and left in the atmosphere for 60 minutes, and this is up to 2400 cycles. It was carried out by repeating. Corrosion resistance characteristics are relative to the progress of corrosion of the outermost aluminum wire of the wire at the attachment part of the bird damage prevention device, relative to “○ (equivalent to the non-attachment part of the bird damage prevention device)”, “× (of bird damage prevention device Corrosion progressed more than the non-attached part) ”and“ XX (corrosion progressed more intensely than the non-attached part of the bird harm prevention apparatus) ”.

(Evaluation method of wind pressure characteristics)
Moreover, the wind pressure characteristics of the installation part of the bird damage prevention device for overhead electric wires were evaluated by the wind tunnel experimental equipment. The electric wire equipped with the bird damage prevention apparatus was installed horizontally, and the wind pressure load was measured using each parameter up to a wind speed of 40 m / s. The wind pressure characteristics were evaluated as “◯” when the level was at an allowable level, and “X” when the level was unacceptable.

(Evaluation direction of construction characteristics)
And the construction characteristic of the bird damage prevention apparatus for various overhead electric wires was also evaluated. As for the construction characteristics, while measuring the time required to attach the bird damage prevention device to the electric wire, we investigated its ease and evaluated the level where there is no problem in the field work as "○" and the level where the problem occurred as "X". did.

  Insulation characteristics evaluation results of bird damage prevention devices for various overhead power lines, corrosion resistance evaluation results of electric wires in the attachment parts of the bird damage prevention devices, wind pressure characteristic measurement results of the attachment parts of the bird damage prevention devices, and construction characteristics of the bird damage prevention devices The evaluation results are shown in Table 1.

(Insulation characteristics evaluation results)
First, regarding the insulation characteristics, the dielectric breakdown voltage values of Examples 1 to 12 all exceeded the specified values, and the insulation characteristics of the bird harm prevention apparatus 10 were satisfactory. Moreover, the dielectric breakdown voltage value also satisfied the specified value for Comparative Examples 2 to 4, 6, 8, and 10 to 12 in which the thickness of the tubular insulator of the bird damage prevention apparatus was 1 mm or more. On the other hand, in Comparative Examples 1, 5, 7, and 9 in which the thickness of the tubular insulator is less than 1 mm, the dielectric breakdown voltage value is less than the specified value, and the insulation characteristics are insufficient. Thus, it turned out that the outstanding insulation characteristic is acquired by setting the thickness of the tubular insulator in a bird damage prevention apparatus to 1 mm or more.

(Evaluation results of corrosion resistance)
Next, regarding the corrosion resistance characteristics, it is clear that the degree of corrosion progression of the outermost aluminum wires in Examples 1 to 12 is at the same level as that of the non-attached portion of the bird harm prevention apparatus, and these corrosion resistance characteristics are clear. became. Moreover, also in Comparative Examples 5 to 12 in which the gap length between the bird harm prevention apparatus (tubular insulator) and the electric wire was 3 mm or more, the corrosion resistance was good. On the other hand, in Comparative Examples 1 to 4 in which the gap length between the tubular insulator and the electric wire is less than 3 mm, and in the conventional examples 1 and 2, the corrosion of the overhead electric wire in the mounting portion of the bird damage prevention device is the bird damage prevention device. It has progressed more than that of the non-attached part, and in particular, in the conventional examples 1 and 2, it was significantly larger. Thus, by setting the gap length between the bird harm prevention apparatus (tubular insulator) and the electric wire to 3 mm or more, contact between the electric wire and the intrusion moisture inside the bird harm prevention apparatus is suppressed, and the bird It was found that drainage and air permeability between the harm prevention device and the electric wire were achieved, and a good corrosion inhibiting effect was obtained.

(Evaluation results of wind pressure characteristics)
And when it looked at the wind pressure characteristic, all the wind pressure loads of the bird harm prevention apparatus in Examples 1-12 were in the allowable level. Moreover, also in Comparative Examples 1 to 8 in which the gap length between the bird harm prevention apparatus (tubular insulator) and the electric wire is 20 mm or less, the wind pressure characteristics were within an allowable range. On the other hand, in Comparative Examples 9 to 12 in which the gap length between the bird damage prevention device (tubular insulator) and the electric wire exceeds 20 mm, the wind pressure load increases due to the mounting of the bird damage prevention device. As a result, the application location was limited. Thus, it turns out that the wind pressure characteristic of the mounting part of this bird damage prevention apparatus can be kept within an allowable range by setting the gap length between the bird damage prevention apparatus (tubular insulator) and the electric wire to 20 mm or less. It was.

(Evaluation results of construction characteristics)
Finally, regarding the construction characteristics, the bird harm prevention apparatus in Examples 1 to 12 could be attached to the overhead electric wire in a short time, and there was no particular problem in terms of work.

  Moreover, the construction characteristics of Comparative Examples 1 to 3, 5, and 7 were at a level with no problem. In contrast, Comparative Examples 4, 6, 8, and 12 in which the thickness of the tubular insulator in the bird damage prevention apparatus exceeds 8 mm, and Comparative Example 9 in which the height of the protrusion 111 on the inner surface of the tubular insulator exceeds 20 mm -11 is inferior in mountability and handleability of the bird damage prevention device, and in particular, in Comparative Example 12, in which the thickness of the tubular insulator exceeds 8 mm and the height of the protrusion 111 exceeds 20 mm, the work takes a very long time. Cost.

  As described above, by setting the thickness of the tubular portion 110 of the tubular insulator 11 in the bird damage prevention apparatus 10 to 8 mm or less and the height of the protruding portion 111 to 20 mm or less, it is possible to obtain trouble-free construction characteristics. I understood.

(Comprehensive evaluation result)
As described above, bird damage for overhead electric wires installed around an overhead electric wire composed of a steel core portion of a galvanized steel wire and a conductor portion in which a plurality of aluminum strands are twisted around the outer periphery of the steel core portion. In the prevention device 10, a tubular insulator 11 having a plurality of protrusions 111 provided on the inner surface of a tubular insulator 11 made of silicone rubber having a thickness of 1 mm or more and 8 mm or less having flexibility, and the protrusions 111 At least one drain pipe 12 made of silicone rubber for forming a gap 13 of 3 mm or more and 20 mm or less between the tubular portion 110 and the overhead electric wire 1 and for discharging moisture accumulated in the tubular insulator 11 is provided. The aerial cable bird damage prevention apparatus 10 provided has a corrosion resistance of the overhead wire in the attachment part of the bird damage prevention apparatus compared with that of the attachment part of the conventional bird damage prevention apparatus while ensuring the prescribed insulation characteristics. That Te excellent remarkably has been found. This bird harm prevention device can reliably and economically prevent the corrosion of wires, ensuring the mechanical and electrical performance of overhead wires, preventing serious accidents, supplying stable power, etc. It becomes possible.

  In addition, this invention is not limited to the said embodiment and said Example, A various deformation | transformation implementation is possible within the range which does not change the summary of invention.

DESCRIPTION OF SYMBOLS 1 Overhead electric wire 2 Steel core part 3 Conductor part 4 Moisture 5 Overhead electric wire bird damage prevention apparatus 10 Overhead electric wire bird damage prevention apparatus 11 Tubular insulator 12 Drain pipe 13 Air gap 21 Insulating resin cover (Infestation resin bird damage prevention apparatus)
31 Insulating tape layer (bird damage prevention device for overhead wires)
110 Tubular part 111 Protrusion part

Claims (3)

  Attached around an overhead electric wire composed of a galvanized steel wire or aluminum-coated steel wire core and a conductor that is twisted with multiple aluminum or aluminum alloy wires on the outer periphery of the steel core In the bird's damage prevention apparatus for an overhead electric wire, a tubular insulator made of silicone rubber having a plurality of protrusions on the inner surface and forming a gap between the overhead wire and the inside of the tubular insulator An aerial wire bird damage prevention apparatus comprising: at least one drainage pipe made of silicone rubber that discharges water accumulated in the water.   The bird damage prevention apparatus for overhead electric wires according to claim 1, wherein the tubular portion of the tubular insulator has a thickness of 1 mm or more and 8 mm or less.   The length of the space | gap formed between the said tubular part and the said overhead wire by the said projection part of the said tubular insulator is 3 mm or more and 20 mm or less, The overhead wire for Claim 1 or 2 characterized by the above-mentioned. Bird damage prevention device.

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