JPH08182165A - Clamp and spacer for fiber-reinforced power-transmission line - Google Patents

Abstract

PURPOSE: To obtain a clamp and a spacer for fiber-reinforced power-transmission line which is improved in heat resistance. CONSTITUTION: A compression type anchoring clamp 6 is made of a composite material of a base material of aluminum or an aluminum alloy and short ceramic fibers or whiskers 10 and, at the time of anchoring a power-transmission line, an electric cable 13 with an exposed steel core at the leading edge is inserted into the main body of the clamp 6 and the steel core is connected to a steel core compressing section at the leading edge of an anchoring section 7 which can be inserted into and removed from the main body of the clamp 6 by compressing the leading edge of the steel core together with the steel core compressing section. Then the body of the clamp 6 is pressed from the outside so as to unite the clamp 6 with the cable 13. When such a clamp 6 is used by a plurality of numbers, a spacer can be constituted. Accordingly, the deterioration of the strength of the clamp 6 due to the temperature rise of the electric cable 13 can be prevented, because the heat resistance of the clamp 6 is improved, and the clamp 6 can be used for fiber-reinforced electric cables. In addition, the weight of the clamp 6 can be reduced, because no heavy heat-resistant alloy is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission line clamp and a spacer.

[0002]

2. Description of the Related Art There are various types of power transmission lines depending on various applications (1)
Steel core aluminum stranded wire, (2) Invar stranded wire, (3) Low loss electric wire, (4) Environmentally friendly electric wire, (5) Optical fiber composite overhead ground wire, (6) Other new kinds of electric wire are used, These power lines have their terminals fastened to the tower using various clamps. The clamp is made of cast aluminum for the purpose of reducing the load on the steel tower. In recent years, fiber-reinforced electric wires have been proposed to meet the demand for increasing the capacity of electric power. Figure 1 shows the fiber-reinforced electric wire.
As shown in Fig. 1, the composite wire 4 is composed of a long wire 1 made of aluminum or an aluminum alloy and a long SiC fiber 3 and a short fiber of ceramics or whiskers 2 combined. This is intended to increase the capacity.

[0003]

Conventionally, a clamp made of an aluminum material has been used as a clamp for holding a transmission line terminal to a steel tower, and its allowable temperature is about the same as the allowable temperature of conventional electric wires. However, since the allowable temperature of the fiber-reinforced electric wire is higher than that of the conventional electric wire, the conventional aluminum clamp portion has a problem of shortening the service life and strength due to high temperature softening. It is conceivable to change the material of the clamp to a heat-resistant alloy other than aluminum, but this is not economical because the load on the steel tower increases as the weight increases. It is an object of the present invention to solve the above-mentioned drawbacks of the prior art and to provide a fiber-reinforced transmission line clamp and spacer having significantly improved heat resistance.

[0004]

In order to solve the above problems, the present invention is a composite of ceramic short fibers or whiskers with an aluminum or aluminum alloy clamp, and a plurality of such clamps are used. It is used to form a spacer.

[0005]

FIG. 2 shows an example of a fiber-reinforced transmission line clamp of the present invention, which is constructed as a compression type retaining clamp 6. The compression-type retaining clamp 6 inserts the electric wire 13 having the exposed steel core at the end into the clamp body when retaining the power transmission line, and first inserts the steel core into the clamp body so that the tip of the retaining portion 7 is removable. The steel wire is compressed and connected together with the steel core compression portion 8, and the entire electric wire is compressed from the outside of the clamp to be crushed and integrated with the clamp. In the present invention, a part of the clamp whose base material is aluminum or aluminum alloy is used. Alternatively, the ceramic short fibers or the whiskers 10 are uniformly combined. In FIG. 2, the combined state of all is represented by an infinite number of points. In such a clamp, ceramic short fibers or whiskers can be cast from a molten aluminum or aluminum alloy that is partially or uniformly dispersed around the part where the clamp is most heated when holding the wire. it can. FIG. 3 is an example of a fiber-reinforced transmission line clamp of the present invention configured as a wedge-type retaining clamp 9. The electric wire 13 inserted into the groove 12 of the clamp body 11 is passed through the groove 12 and then passed through a jumper metal fitting 14 for guiding the bending of the jump portion of the electric wire. A wedge 17 is driven between the electric wire 13 inserted into the groove 12 and the wedge pressing metal fitting 16 pivotally supported by the bolt 15 to prevent the electric wire from coming off. The metal fitting 18 having a U-shaped cross section is pivotally supported by the bolt 15 together with the clamp body 11. Jumper bracket 14
On the fin 19 formed at the base end of the wedge 17,
It is fixed using bolts 20. After attaching the power transmission line to the clamp, the retaining portion 21 is fixed to the steel tower. In this example as well, similar to the example of FIG. 2, the ceramic short fibers or the whiskers 10 are compounded with a part or all of the aluminum or aluminum alloy clamp. In addition to this, as a clamp, instead of the wedge in the example of the wedge type retaining clamp, there is a bolt tightening type clamp that tightens a plurality of metal fittings for pressing the electric wire housed in the groove with a bolt, but like the above example, This can be configured as a fiber reinforced power line clamp. As a type of clamp, a bolt tightening type clamp is preferable to a compression type in consideration of crushing of the wire. FIG. 4 is an example applied to a spacer, and four clamps 23 are attached to the frame 22. When fixing the electric wire, the electric wire gripping portion 25 pivotally supported by the hinge pin 24 is opened, the electric wire is inserted and gripped, and the bolt 2
Fix with 6. The individual clamps are made of aluminum or aluminum alloy and ceramic short fibers or whiskers dispersed therein, and the spacers are formed by these.

[0006]

【The invention's effect】

(1) By combining ceramic short fibers or whiskers with an aluminum or aluminum alloy clamp, it is possible to prevent a decrease in the strength of the clamp due to an increase in temperature of the electric wire. (2) The advantages of the fiber-reinforced electric wire with improved heat resistance can be maximized. (3) By combining the ceramic short fibers or whiskers with the aluminum or aluminum alloy clamp, the weight of the clamp can be reduced and the strength of the steel tower can be reduced.

[Brief description of drawings]

FIG. 1A is a cross-sectional view of a fiber-reinforced electric wire. (B) The same longitudinal sectional view.

FIG. 2 is a diagram showing a state in which an electric wire is inserted into the fiber-reinforced transmission line clamp according to the embodiment of the present invention.

FIG. 3 is a diagram showing a state in which an electric wire is inserted in a fiber-reinforced transmission line clamp according to another embodiment of the present invention.

FIG. 4 is a diagram showing a spacer for fiber-reinforced transmission line of the present invention.

[Explanation of symbols]

1 Strands made of aluminum or aluminum alloy 14 Jumper metal fittings 2 Ceramic short fibers or whiskers 15 Bolts 3 Long SiC fibers 16 Wedge-holding metal fittings 4 Composite wires 17 Wedges 5 Central part of composite wire 18 Attaching metal fittings 6 Compression type fastening Clamp 19 Fin 7 Holding part 20 U
Bolt 8 Steel core compression part 21 Holding part 9 Wedge type holding clamp 22 Frame 10 Short fibers or whiskers of ceramics 23
Clamp 11 Clamp body 24
Hinge pin 12 Groove 25
Electric wire holding part 13 Electric wire 26
bolt

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiromitsu Kuroda 5-1-1, Hidaka-cho, Hitachi-shi, Ibaraki Hitachi Power Systems Co., Ltd. Power Systems Laboratory (72) Inventor Koji Nagano 5 Hidaka-cho, Hitachi-shi, Ibaraki 1-1-1 Hitachi Cable Co., Ltd. Power Systems Laboratory (72) Inventor Nobuaki Suga 4-10-1 Kawajiri-cho, Hitachi-shi, Ibaraki Hitachi Cable Co., Ltd. Toyoura Plant

Claims (2)

[Claims] 1. A clamp for a fiber-reinforced transmission line, characterized in that a short fiber of ceramics or whiskers is combined with a part or the whole of a clamp of aluminum or an aluminum alloy. 2. A spacer for a fiber-reinforced transmission line, comprising a plurality of clamps made by compounding ceramic short fibers or whiskers in a part or the whole of an aluminum or aluminum alloy clamp.