JPH09312109A - Compound insulator - Google Patents

Abstract

(57) Abstract: A conventional composite insulator has a structure in which an insulating mandrel made of FRP having uniform rigidity in the longitudinal direction is arranged between terminal fittings, and is weak in bending and buckling. was there. SOLUTION: An FRP insulating mandrel, terminal fittings 2A and 2B attached to both ends of the FRP insulating mandrel, and an organic insulating material 3 coated on the outer circumference of the FRP insulating mandrel.
In the composite insulator composed of and, the portion of the FRP insulating mandrel is a first insulating mandrel 1A made of FRP of a predetermined length and a second mandrel 1B which is more rigid than the first insulating mandrel 1A made of FRP. Is composed of a composite mandrel 1C that is integrated in the longitudinal direction. Since the FRP has a short length and the second mandrel is more rigid than the first insulating mandrel made of FRP, It is possible to obtain a composite insulator that is resistant to bending and buckling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an FRP insulating mandrel, terminal fittings attached to both sides of the FRP insulating mandrel, and an organic insulating material coated on the outer circumference of the FRP insulating mandrel. It relates to a composite insulator consisting of.

[0002]

2. Description of the Related Art A conventional composite insulator is, as shown in FIG.
It is composed of an FRP insulating mandrel 1, terminal fittings 2A and 2B attached to both ends of the FRP insulating mandrel 1, and an organic insulating material 3 coated on the outer circumference of the FRP insulating mandrel 1. There is. The FRP insulating mandrel 1 has uniform rigidity in the longitudinal direction, the terminal fittings 2A, 2B are made of iron, and the organic insulating material 3 is made of silicone rubber. 3 A of umbrella parts are formed in it.

Since this composite insulator is lightweight, has impact resistance, has high water repellency, and is resistant to leakage current, it is used as an interphase spacer to be installed between phases of an overhead power transmission line. It is used as a support insulator, a line post insulator, a station post insulator, and an insulator for a movable bracket of a train track.

[0004]

As described above, the conventional composite insulator has a structure in which the FRP insulating mandrel 1 having uniform rigidity in the longitudinal direction is arranged between the terminal fittings 2A and 2B. However, there was a problem that it was weak against bending and buckling.

[0005]

DISCLOSURE OF THE INVENTION The present invention provides a composite insulator which solves the above-mentioned problems, and its structure is FRP.
A composite insulator comprising an insulating mandrel made of FRP, end fittings attached to both ends of the insulating mandrel made of FRP, and an organic insulating material coated on the outer periphery of the insulating mandrel made of FRP. Is composed of a composite mandrel in which a first insulating mandrel made of FRP having a predetermined length and a second mandrel having a rigidity higher than that of the first insulating mandrel made of FRP are integrated in the longitudinal direction. To do. In the present invention, “having rigidity” means having a large longitudinal elastic modulus.

As described above, the composite mandrel in which the first insulating mandrel made of FRP having a predetermined length and the second mandrel which is more rigid than the first insulating mandrel made of FRP are integrated in the longitudinal direction is used. As a result, the length of the FRP, which is weak against bending and buckling, can be shortened. Further, since the second mandrel is stiffer than the FRP first insulating mandrel, the second mandrel is not bent or buckled before the FRP first insulating mandrel. Thus, since the FRP, which is weak in bending and buckling, has a short length and the second mandrel is more rigid than the first insulating mandrel made of FRP, it is possible to obtain a composite insulator that is strong in bending and buckling. You can

That is, various forces such as load, bending, and compression are applied to the composite insulator depending on the usage conditions. For example, when the composite insulator is used for a movable bracket of a train track, the composite insulator is used in a so-called cantilever state, and a force such as bending or compression is applied.

As in the present invention, the mandrel is fixed to the FRP of a predetermined length.
Buckling due to bending force and buckling due to compression when a first insulating mandrel made of FRP and a second mandrel having rigidity higher than the first insulating mandrel made of FRP are integrated in the longitudinal direction The strength and bending strength are examined as follows.

Now, when the bending force applied to the composite insulator is applied as a load to the cantilever, the deflection V due to the bending force applied to the FRP insulating mandrel is V = WL ³ / 3EI-(1) formula (W: load, L: length of FRP insulating mandrel,
E: longitudinal elastic modulus, I: second moment of area).

When the bending force applied to the composite insulator is applied as a bending moment to the cantilever beam, the flexure V due to the bending force applied to the FRP insulating mandrel is V = ML ² / 2EI-(2) It is given by the formula (however, M: bending moment, L: length of FRP insulating mandrel, E: longitudinal elastic modulus, I: second moment of area).

The smaller the deflection V due to the bending force applied to the FRP insulating mandrel, the better. As is clear from the above equations (1) and (2), the length L of the FRP mandrel is L.
When is shortened, the flexure V due to the bending force applied to the FRP mandrel becomes small.

In the present invention, the mandrel is a FR of a predetermined length.
Since the first insulating mandrel made of P and the second mandrel that is more rigid than the first mandrel made of FRP are integrated in the longitudinal direction, the composite mandrel is involved. It can be regarded as only one insulating mandrel, and the length of the FRP becomes shorter than that of the conventional one, so that the bending due to the bending force can be reduced.

The buckling strength P due to compression is expressed by the equation P = nπ ² EI / L ² (3) (where n is the buckling coefficient and n = 2 under the condition of one end fixed,
E: longitudinal elastic modulus, I: second moment of area L: length of FRP insulating mandrel).

The greater the buckling strength P due to compression, the better,
As is clear from the above formula (3), when the length L of the FRP insulating mandrel is shortened, the buckling strength is improved.

In the present invention, the mandrel is a FR of a predetermined length.
The first insulating mandrel made of P and the second mandrel having a rigidity higher than that of the first insulating mandrel made of FRP are constituted by a compound mandrel which is integrated in the longitudinal direction, so that the buckling is involved in the FRP It can be regarded as only the first insulating mandrel, and the buckling strength can be improved because the length of the FRP becomes shorter than that of the conventional one.

Further, when the bending force applied to the composite insulator is applied as a load to the cantilever, the bending strength P of the FRP insulating mandrel is expressed by the formula P = σ _P Z / L (4) (where σ _P ; Bending strength of beam material, Z; Section modulus,
L; length of FRP insulating mandrel).

It is desirable that the bending strength of the FRP insulating mandrel is large. As is clear from the above formula (4), the FRP is
The bending strength of the FRP insulating mandrel increases as the length L of the insulating mandrel made of FRP becomes shorter.

In the present invention, the mandrel is a FR of a predetermined length.
Since the first insulating mandrel made of P and the second mandrel having a rigidity higher than that of the first insulating mandrel made of FRP are constituted by a composite mandrel integrated in the longitudinal direction, what is involved in bending is made of FRP. It can be regarded as only the first insulating mandrel, and the bending strength of the FRP mandrel becomes larger than that of the conventional one.

As described above, according to the present invention, the mandrel has the predetermined length of the first insulating mandrel made of FRP and the second mandrel which is more rigid than the first insulating mandrel made of FRP and is integrated in the longitudinal direction. Since it is configured by the compounded mandrel, the bending caused by the bending force can be reduced, and the buckling strength and the bending strength due to the compression can be improved.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view showing a first embodiment of a composite insulator according to the present invention. This composite insulator is FRP
Although it is the same as the conventional one in that it is made up of an insulating mandrel 1 made of iron, a metal terminal fitting 2A 2B made of iron, and an organic insulating material 3 such as a silicone rubber having an umbrella portion 3A formed on the outer periphery, A portion of the mandrel arranged between the metal fittings 2A and 2B is integrated in the longitudinal direction with a first insulating mandrel 1A made of FRP and a second mandrel 1B having a rigidity higher than that of the first insulating mandrel 1A made of FRP. It is characterized in that it is composed of the compounded mandrel 1C.

The second mandrel 1B in the embodiment is made of iron and is formed integrally with the terminal fitting 2B. A hole 4 is formed at the tip of the iron second mandrel 1B,
One end side of the first insulating mandrel 1A made of FRP is inserted into the hole 4 and integrated by adhesion, pressure bonding or the like.

The other end of the first insulating mandrel 1A made of FRP, that is, the side not connected to the second mandrel 1B made of iron, is connected and integrated with a terminal metal fitting 2A by adhesion or pressure bonding. .

FIG. 2 is a sectional view showing a second embodiment of the composite insulator according to the present invention. This composite insulator is a composite mandrel in which a first insulating mandrel 1A made of FRP having a predetermined length and a metallic second mandrel 1B which is more rigid than the first insulating mandrel 1A made of FRP are integrated in the longitudinal direction. 1C is the same as that of the above-mentioned embodiment, but is characterized in that the first insulating mandrel 1A and the second mandrel 1B have the same diameter, and they are connected by a ring body 5 to be integrated. . Since the other points are the same as those of the above-described embodiment, the same reference numerals are given and the description thereof will be omitted.

FIG. 3 is a sectional view showing a third embodiment of the composite insulator according to the present invention. This composite insulator is a composite mandrel in which a first insulating mandrel 1A made of FRP having a predetermined length and a metallic second mandrel 1B which is more rigid than the first insulating mandrel 1A made of FRP are integrated in the longitudinal direction. 1C is the same as in the above-mentioned embodiment, but the second mandrel 1B has a pipe shape, and one end side of the first insulating mandrel 1A is inserted into the tip end side of the pipe-shaped second mandrel 1B. The feature is that they are integrated by adhesion, pressure bonding, and the like. Since the other points are the same as those of the above-described embodiment, the same reference numerals are given and the description thereof will be omitted.

FIG. 4 is a sectional view showing a fourth embodiment of the composite insulator according to the present invention. In this composite insulator, an iron pipe is used as the second mandrel 1B.
The terminal metal fitting 2B is crimp-connected to one end side of B, and the first insulating mandrel 1A made of FRP is crimp-connected to the other end side through an iron-made connecting body 6 having a substantially U-shaped cross section. That is, the connecting body 6 is such that the convex portion projecting on one end side is fitted to the inner peripheral surface of the iron pipe 1B to perform crimp connection, and the cylindrical portion formed on the other end side has the first insulation made of FRP. By inserting the mandrel 1A and crimping and connecting it, the iron pipe which is the second mandrel 1B and the first insulating mandrel 1A made of FRP are connected. The terminal fitting 2A is formed in an arcuate shape at the tip and the terminal fitting 2B is formed in a rectangular shape at the tip. Since the other points are the same as those of the above-described embodiment, the same reference numerals are given and the description thereof will be omitted.

FIG. 5 is a sectional view showing a fifth embodiment of the composite insulator according to the present invention. This composite insulator is shown in FIG.
The shape of the terminal fittings 2A and 2B is different from that shown in FIG. That is, the end fitting 2A is formed in a rectangular tip shape, and the end fitting 2B is formed in an arc end shape.
Since the other points are the same as those of the above-described embodiment, the same reference numerals are given and the description thereof will be omitted.

FIG. 6 is a sectional view showing a sixth embodiment of the composite insulator according to the present invention. In this composite insulator, the second mandrel 1B, the terminal fitting 2B and the connecting body 6 are integrally formed of iron, and the second mandrel 1B made of iron is used as a solid body. It is different from the form. Since the other points are the same as those of the above-described embodiment, the same reference numerals are given and the description thereof will be omitted.

FIG. 7 is a sectional view showing a seventh embodiment of the composite insulator according to the present invention. This composite insulator is composed of a second insulating mandrel 1 made of FRP and having a rigidity higher than that of the first insulating mandrel 1A made of FRP on both sides of the first insulating mandrel 1A made of FRP.
B is arranged and these are integrated in the longitudinal direction to form a composite mandrel 1
The point that C is configured is different from the above-described embodiment. Second
The mandrel 1B is formed integrally with the iron terminal fittings 2A and 2B. In addition, a hole (not shown) is formed at the tip of the second mandrel 1B integrally formed with each of the terminal fittings 2A and 2B, and the first insulating mandrel 1A made of FRP is formed in the hole.
Both end sides of are inserted and integrated by adhesion, pressure bonding, or the like. Since the other points are the same as those of the above-described embodiment, the same reference numerals are given and the description thereof will be omitted.

FIG. 8 is a sectional view showing an eighth embodiment of the composite insulator according to the present invention. This composite insulator includes a first insulating mandrel 1A made of FRP having a predetermined length and a second insulating mandrel 1 made of FRP which is more rigid than the first insulating mandrel 1A made of FRP.
A characteristic is that B and B are integrated in the longitudinal direction to form a composite mandrel 1C. In other words, the first insulating mandrel 1A and the second insulating mandrel 1B are made of the same FRP, the first insulating mandrel 1A is hollow, and the second insulating mandrel 1B is solid. . In the composite mandrel 1C, for example, a hollow portion is formed by removing a central portion on one end side of a solid type FRP by a predetermined length, and the hollow portion is used as a first insulating mandrel 1A. May be formed as the second insulating mandrel 1B. In such a composite mandrel 1C, the second insulating mandrel 1B has higher rigidity than the first insulating mandrel 1A. Since the other points are the same as those of the above-described embodiment, the same reference numerals are given and the description thereof will be omitted.

The FRP first insulating mandrel 1A used in the present invention may be a solid type or a hollow type. The cross-sectional shape may be round or polygonal.

Further, the length of the first insulating mandrel 1A made of FRP needs to be long enough to secure the insulation in the longitudinal direction of the composite insulator, and is designed as appropriate according to the place of use.

Similarly, since various stresses applied to the composite insulator are different depending on the place of use of the composite insulator, the length of the first insulating mandrel 1A made of FRP and the length of the second mandrel 1B are made suitable for the place of use. The length, the thickness of the first insulating mandrel 1A made of FRP, the thickness of the second mandrel 1B, and the like are appropriately designed.

Further, as means for integrating the first insulating mandrel 1A made of FRP and the second mandrel 1B in the longitudinal direction,
Various means can be used, and the means is not limited to the means shown in the above embodiment.

Further, as the organic insulating material 3 used in the present invention, in addition to silicone rubber, silicon resin, EPDM
Rubber, EVA copolymer, etc. can be used. When the organic insulating material 3 is formed around the composite mandrel, the surface of the composite mandrel is treated with a primer containing a silane coupling agent as a main component or a metal surface treatment in order to improve the adhesion between the two. It is preferable to perform a chromate treatment, which is one of the above.

Further, when the second mandrel 1B is made of metal, it is preferable to subject the tip end portion of the second mandrel 1B to electric field relaxation treatment. For example, an electric field of a semi-conductive silicone rubber material or the like having a volume resistivity of about 10 ⁸ to 10 ¹¹ straddling the tip end portion of the second mandrel 10 made of metal and the outer periphery of the first insulating mandrel 1A made of FRP. It is coated with a relaxation agent so that the electric field at the tip of the second mandrel 1B made of metal is relaxed.
As a result, the length of the first insulating mandrel 1A made of FRP can be shortened, and the dielectric breakdown at the portion of the first insulating mandrel 1A made of FRP can be effectively prevented.

Further, when the composite insulator shown in FIGS. 1 and 2 is used in a place where bending and breaking due to bending force are a problem, the terminal metal fitting 2B side should be positioned on the fixed end side, that is, the second end. Positioning the mandrel 1B on the fixed end side is preferable from the viewpoint of relaxing the bending force and the breaking force applied to the first insulating mandrel 1A made of FRP.

Further, the terminal fittings 2A, 2 used in the present invention
The shape of B is not particularly limited, and any shape can be used.

[0038]

【Example】

(Embodiment 1) In FIG. 2, L = 487 mm, L ₁ = 8
0 mm, L ₂ = 112 mm, L ₃ = 112 mm, L ₄ =
103 mm, L ₅ = 80 mm, φ1 = 25 mm, φ2 =
The FRP (tensile elastic modulus 33 GPa) made of bisphenol epoxy resin having a glass content of 70% is used as the first insulating mandrel 1A of 25 mm, and iron (tensile elastic modulus 210 GPa) is used as the terminal fittings 2A and 2B.
The second mandrel 1B was formed integrally with the terminal fitting 2B and made of the same iron as the terminal fitting 2B. As the pipe 5, an iron pipe having an inner diameter of 25 mm and an outer diameter of 35 mm was used. Furthermore, silicone rubber (FDR-70U made by Dow Corning Toray Co., Ltd.) is used as the organic insulating material 3, and the umbrella portion 3 is provided on the outer periphery.
A was formed.

This is referred to in JIS C-3801, 7.2.2.
According to the item, the terminal metal fitting 2B side was fixed, a bending force was applied to the terminal metal fitting 2A in a direction perpendicular to the insulator, and the bending breaking load was measured. A compressive force was measured by applying compressive force to both ends of the insulator. Table 1 shows the results.

Further, the above-mentioned two composite insulators were mounted on the O-type movable bracket for DC 1500V power line shown in FIG. 10, and the vertical load W of the movable bracket was set to 3.19 kN.
The suspension wire horizontal load M was set to 3.48 kN and the trolley wire horizontal load T was set to 1.13 kN, and the bending of the movable bracket at the point X caused by the bending of the composite insulator was measured. Table 1 shows the measured values. In FIG. 10, 10 is a composite insulator according to the present invention, 11 is an electric pole, 12 is an iron pipe, 13 is a connecting portion between the electric pole 11 and the composite insulator 10, and the composite insulator 10 is a connecting portion 13 through a connecting portion 13. It is connected to 11 so as to be rotatable in the circumferential direction and movable in the vertical direction.

(Embodiment 2) In FIG. 3, L = 487 m
m, L ₁ = 35 mm, L ₂ = 197 mm, L ₃ = 112
mm, L ₄ = 103 mm, L ₆ = 40 mm, φ1 = 17
mm, φ2 = 27 mm, φ3 = 17 mm, using FRP (tensile elastic coefficient 33 GPa) made of bisphenol epoxy resin with a glass content of 70% as the first insulating mandrel 1A made of FRP, and as the terminal fittings 2A and 2B. The second mandrel 1 is made of iron (tensile elastic modulus 210 GPa)
B was formed integrally with the terminal fitting 2B and made of the same iron as the terminal fitting 2B. Incidentally connection between the first insulating mandrel 1A and the second mandrel 21 FRP made was carried out by compressing the portion of the L _6. Silicone rubber (FDR-70U made by Dow Corning Toray Co., Ltd.) was used as the organic insulating material 3, and an umbrella portion 3A was formed on the outer circumference.

In the same manner as in Example 1, using the composite insulator having the above-mentioned structure, the bending breaking load, the compressive load, and the bending of the movable bracket at point X in FIG. 10 were measured. Table 1 shows each of these measured values.

Comparative Example 1 In FIG. 9, L = 487 m
m, L ₁ = 272 mm, L ₃ = 112 mm, L ₄ = 10
3 mm, φ1 = 38 mm, FRP first insulating mandrel 1
FRP (tensile elastic modulus 33 GPa) made of bisphenol epoxy resin having a glass content of 70% is used as A, and iron (tensile elastic modulus 21 is used as the terminal fittings 2A and 2B.
0 GPa) was used. Silicone rubber (FDR-70 manufactured by Toray Dow Corning Co., Ltd.) is used as the organic insulating material 3.
U) was used to form the umbrella portion 3A on the outer circumference.

In the same manner as in Example 1, the composite insulator having the above structure was subjected to bending load, compressive load, and bending of the movable bracket at point X in FIG. Table 1 shows each of these measured values.

[0045]

[Table 1]

According to Table 1 above, the bending fracture load of Example 2 is worse than that of Comparative Example 1, but it is used for the O-type movable bracket for the DC 1500V power line shown in FIG. The bending fracture load required for the insulator is 3.1 kN, and there is no problem as an insulator used for the O-type movable bracket for the DC 1500V train line shown in FIG.
Further, the compressive breaking load of Example 2 is worse than that of Comparative Example 1, but at the time of measuring the maximum bending of the bracket, even if it is used for the O-type movable bracket for the 1500V DC power line shown in FIG. As is apparent from the fact that there was no problem, there is no problem as an insulator used for the O-type movable bracket for the 1500V DC train line. Furthermore, the maximum bending of the bracket, which is the most important for practical performance, has been greatly improved.

The diameter φ1 of the FRP first insulating mandrel 1A of Comparative Example 1 is 38 mm, while the diameter φ1 of the FRP first insulating mandrel 1A of Example 1 is 25 mm. Diameter φ1 of the FRP first insulating mandrel 1A of Example 2
Is 17 mm. Thus, in the present invention, FR
The material cost of P is reduced.

(Embodiment 3) In FIG. 4, L = 971 m
m, L ₁ = 313 mm, L ₂ = 351 mm, L ₃ = 15
0 mm, L ₄ = 50 mm, L ₇ = 60 mm, L ₈ = 7 m
m, L ₉ = 40 mm, φ1 = 44 mm, φ2 = 42.7
mm, φ3 = 22.7 mm, FRP made of bisphenol epoxy resin with 70% glass content as the first insulating mandrel 1A made of FRP (tensile elastic modulus 33GP
a), iron (tensile elastic modulus 210 GPa) is used as the terminal fittings 2A and 2B, an iron pipe (tensile elastic modulus 210 GPa) is used as the second mandrel 1B, and iron (tensile tensile) is used as the connecting body 6. An elastic modulus of 210 GPa) was used. The connection between the connector 6 and the first insulating mandrel 1A and the second mandrel 1B made of FRP was performed by compression. Furthermore, silicone rubber (FDR-70U made by Dow Corning Toray Co., Ltd.) is used as the organic insulating material 3, and the umbrella portion 3A is provided on the outer periphery.
Was formed.

The composite insulator having the above-mentioned structure is used in the same manner as in the first embodiment.
According to the item 7.2.2 of IS C-3801, the terminal metal fitting 2B side was fixed, a bending force was applied to the terminal metal fitting 2A in a direction perpendicular to the insulator, and the bending breaking load was measured. A compressive force was applied to both ends of the composite insulator and the compressive load was measured. Table 2 shows the results.

Further, the above-mentioned two composite insulators are attached to the trunk O type movable bracket for the Shinkansen train line shown in FIG.
The vertical load W of the movable bracket is set to 3.53 kN, the suspension wire horizontal load M is set to 4.02 kN, and the trolley wire horizontal load T is set to 5.69 kN, and the movable bracket at the point X caused by the bending of the composite insulator is set. Deflection was measured. Table 2 shows the measured values. Note that, in FIG. 11, the composite insulator 10 according to the present invention has a utility pole 1 through a connecting portion 13.
It is connected to the unit 1 so as to be rotatable in the circumferential direction and movable in the vertical direction. Others In FIG. 11, FIG.
The same parts as 0 are designated by the same reference numerals and the description thereof will be omitted.

(Embodiment 4) In FIG. 4, L = 971 m
m, L ₁ = 272 mm, L ₂ = 300 mm, L ₃ = 15
0 mm, L ₄ = 50 mm, L ₇ = 60 mm, L ₈ = 7 m
m, L ₉ = 40 mm, φ1 = 44 mm, φ2 = 42.7
mm, φ3 = 22.7 mm, FRP made of bisphenol epoxy resin with 70% glass content as the first insulating mandrel 1A made of FRP (tensile elastic modulus 33GP
a), iron (tensile elastic modulus 210 GPa) is used as the terminal fittings 2A and 2B, an iron pipe (tensile elastic modulus 210 GPa) is used as the second mandrel 1B, and iron (tensile tensile) is used as the connecting body 6. An elastic modulus of 210 GPa) was used. The connection between the connector 6 and the first insulating mandrel 1A and the second mandrel 1B made of FRP was performed by compression. Furthermore, silicone rubber (FDR-70U made by Dow Corning Toray Co., Ltd.) is used as the organic insulating material 3, and the umbrella portion 3A is provided on the outer periphery.
Was formed.

The composite insulator having the above-mentioned structure is used in the same manner as in the first embodiment.
According to the item 7.2.2 of IS C-3801, the terminal metal fitting 2B side was fixed, a bending force was applied to the terminal metal fitting 2A in a direction perpendicular to the insulator, and the bending breaking load was measured. A compressive force was applied to both ends of the composite insulator and the compressive load was measured. Table 2 shows the results.

Further, the above-mentioned two composite insulators were mounted on the trunk O type movable bracket for the Shinkansen train line shown in FIG. 11 in the same manner as in Example 3, and the deflection of the movable bracket at the point X was measured. Table 2 shows the measured values.

(Embodiment 5) In FIG. 6, L = 971 m.
m, L ₁ = 272 mm, L ₂ = 391 mm, L ₃ = 15
0 mm, L ₄ = 50 mm, L ₇ = 60 mm, L ₈ = 7 m
m, φ1 = 44 mm, φ2 = 42.7 mm, FRP
The first insulating mandrel 1A made of FRP (tensile modulus of elasticity 33 GPa) made of bisphenol epoxy resin having a glass content of 70% is used, and the terminal fitting 2A is made of iron (tensile modulus of elasticity 210 GPa). Iron (tensile elastic modulus 210
GPa) was used and integrated. The connection between the connector 6 and the first insulating mandrel 1A and the second mandrel 1B made of FRP was performed by compression. Furthermore, silicone rubber (FDR-70U manufactured by Dow Corning Toray Co., Ltd.) was used as the organic insulating material 3, and an umbrella portion 3A was formed on the outer periphery.

A composite insulator having the above-mentioned structure is used as in the first embodiment.
According to the item 7.2.2 of IS C-3801, the terminal metal fitting 2B side was fixed, a bending force was applied to the terminal metal fitting 2A in a direction perpendicular to the insulator, and the bending breaking load was measured. A compressive force was applied to both ends of the composite insulator and the compressive load was measured. Table 2 shows the results.

Further, the above-mentioned two composite insulators were mounted on the trunk O type movable bracket for the Shinkansen train line shown in FIG. 11 in the same manner as in Example 3, and the deflection of the movable bracket at point X was measured. Table 2 shows the measured values.

Comparative Example 2 In FIG. 9, L = 971 m
m, L ₁ = 707 mm, L ₃ = 150 mm, L ₄ = 11
4 mm, φ1 = 63 mm, first insulating mandrel 1 made of FRP
FRP (tensile elastic modulus 33 GPa) made of bisphenol epoxy resin having a glass content of 70% is used as A, and iron (tensile elastic modulus 21 is used as the terminal fittings 2A and 2B.
0 GPa) was used. Silicone rubber (FDR-70 manufactured by Toray Dow Corning Co., Ltd.) is used as the organic insulating material 3.
U) was used to form the umbrella portion 3A on the outer circumference.

The composite insulator having the above structure was subjected to bending load, compressive load and bending of the movable bracket at point X in FIG. 11 in the same manner as in Example 3. Table 2 shows each of these measured values.

[0059]

[Table 2]

According to Table 2 above, the bending fracture loads of Example 3 and Example 5 are worse than that of Comparative Example 2, but the trunk O type movable for the Shinkansen train line shown in FIG. The bending fracture load required for the insulator used for the bracket is 4.
It is 4 kN, and there is no problem as an insulator used for the O-type movable bracket for the Shinkansen train line shown in FIG.
In addition, the compressive breaking load and the maximum bending of the bracket in Examples 3, 4 and 5 are both better than those in Comparative Example 2.

The diameter of the first insulating mandrel 1A made of FRP of Comparative Example 2 was 63 mm, whereas the diameter of the first insulating mandrel 1A made of FRP in Examples 3, 4 and 5 was 3 mm. The diameter φ1 is 44 mm, and in the present invention, FR
The material cost of P is reduced.

(Embodiment 6) In FIG. 5, L = 1814
mm, L₁= 920 mm, L_Two= 484 mm, L _Three= 1
50 mm, L_Four= 150 mm, L₇= 60 mm, L₈=
10 mm, L₉= 60 mm, φ1 = 63 mm, φ2 = 6
3.5mm, φ3 = 41.5mm, FRP first
Insulating mandrel 1A has a glass content of 70%
FRP (Natural Elastic Modulus 33
GPa) and use iron (tension) as the end fittings 2A, 2B.
The elastic modulus of 210 GPa) is used as the second mandrel 1B.
Use a steel pipe (tensile elastic modulus 210 GPa)
In addition, as the connecting body 6, iron (tensile elastic modulus 210 GP
a) was used. Connection body 6 and FRP first insulating mandrel
1A and the second mandrel 1B are connected by compression.
Was. Furthermore, as the organic insulating material 3, silicone rubber (Toray
Dow Corning FDR-70U)
The umbrella portion 3A is formed.

Two composite insulators 10 according to the present invention having the above construction are provided.
As shown in FIG. 12, this was used as an insulating arm that was attached to a utility pole 11 simulating a power transmission tower in an equilateral triangle shape to hold an electric wire. Now, the electric wire that is connected to the insulating arm is 410 mm.
^{In the case of a 2-} steel aluminum stranded wire, the vertical load applied to the insulating arm by the weight of the wire and the vertical component of the wire's overhead wire tension is W, and the sum of the horizontal component of the wire's overhead wire tension and the wind pressure received by the wire is When the horizontal load to be applied is H, a vertical load W equal to 10 times these values and horizontal loads H of 141 kN and 105 kN were simultaneously applied to the insulating arm. The composite insulator 10 is connected to the electric pole 11 via a connecting portion 13 so as to be rotatable in the circumferential direction.
As a result, no damage was caused to the two composite insulators constituting the insulating arm.

Comparative Example 3 In FIG. 9, L = 1814
mm, L ₁ = 1514 mm, L ₃ = 150 mm, L ₄ =
150 mm, φ1 = 63 mm, FRP made of bisphenol epoxy resin with 70% glass content as the first insulating mandrel 1A made of FRP (tensile elastic modulus 33 GPa)
Was used, and iron (tensile elastic modulus 210 GPa) was used as the terminal fittings 2A and 2B. Silicone rubber (FDR-7 manufactured by Toray Dow Corning Co., Ltd.) is used as the organic insulating material 3.
0 U) was used to form the umbrella portion 3A on the outer circumference.

The composite insulator having the above structure is used as an insulating arm as shown in FIG.
= 141 kN and horizontal load H = 105 kN were simultaneously applied to the insulating arm. As a result, the lower composite insulator buckled.

As is clear from Example 6 and Comparative Example 3 described above, the composite insulator according to the present invention can sufficiently withstand practical use.

[0067]

As described above, the composite insulator according to the present invention has the FRP insulating mandrel, the terminal fittings attached to both ends of the FRP insulating mandrel, and the outer circumference of the FRP insulating mandrel. In a composite insulator made of a coated organic insulating material, the portion of the FRP insulating mandrel having a predetermined length of F
The first insulating mandrel made of RP and the second insulating mandrel having a rigidity higher than that of the first insulating mandrel made of FRP are constituted by a composite mandrel integrated in the longitudinal direction. The FRP, which is weak against buckling, has a short length and the second mandrel is F
Since it is more rigid than the RP first insulating mandrel, it is possible to obtain a composite insulator that is resistant to bending and buckling.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a composite insulator according to the present invention.

FIG. 2 is a sectional view showing a second embodiment of the composite insulator according to the present invention.

FIG. 3 is a sectional view showing a third embodiment of the composite insulator according to the present invention.

FIG. 4 is a sectional view showing a fourth embodiment of the composite insulator according to the present invention.

FIG. 5 is a sectional view showing a fifth embodiment of the composite insulator according to the present invention.

FIG. 6 is a sectional view showing a sixth embodiment of the composite insulator according to the present invention.

FIG. 7 is a sectional view showing a seventh embodiment of the composite insulator according to the present invention.

FIG. 8 is a sectional view showing an eighth embodiment of the composite insulator according to the present invention.

FIG. 9 is a sectional view of a conventional composite insulator.

FIG. 10 is an explanatory view showing a bending test state of the composite insulator according to the present invention.

FIG. 11 is an explanatory view showing a bending test state of the composite insulator according to the present invention.

FIG. 12 is an explanatory view showing an experimental state of buckling of the composite insulator according to the present invention.

[Explanation of symbols]

 1A FRP first insulating mandrel 1B Second mandrel 1C Composite mandrel 2A, 2B Terminal fitting 3 Organic insulating material 5 Pipe 6 Connection body

Claims (1)

[Claims] 1. A composite insulator comprising an FRP insulating mandrel, terminal fittings attached to both ends of the FRP insulating mandrel, and an organic insulating material coated on the outer periphery of the FRP insulating mandrel, Part of the FRP insulating mandrel,
A first insulating mandrel made of FRP having a predetermined length and the first insulating mandrel made of FRP.
2. A composite insulator comprising a composite mandrel which is integrated with a second mandrel having a rigidity higher than that of the insulating mandrel in the longitudinal direction.