JPH0746531B2 - Difficult-to-use ice wire - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an ice-and-snow electric wire that is difficult to ice, which utilizes an exothermic reaction of a hydrogen storage alloy to prevent ice and snow on overhead power transmission lines and the like.

(Prior Art) In cold regions, ice and snow adhering to overhead power lines may develop without falling, and the weight may cause breakage of overhead power lines or accidents in which towers collapse.

Conventionally, the following measures have been taken as measures to prevent such accidents.

That is, a magnetic material called a snow melting core that generates heat by electromagnetic induction of an electric current is attached to an electric wire as a means for maintaining the non-adhesive snow condition or melting the adhered ice and snow. Similarly to the above, the low Curie magnetic material is spirally wound around the electric wire.
A method of winding a water-repellent Teflon tape around an electric wire is used.

As a means to prevent the development of snow accretion, a ring is used to prevent the snow accretion from moving along the twist of the electric wire. A twist prevention weight is attached to the wire to prevent the wire from twisting and developing into a cylindrical shape when it snows. Methods such as dropping iced snow by shock vibration are taken.

(Problems to be Solved) The conventional means described above have the following problems, and none of them have sufficient effects.

The means for generating heat by electromagnetic induction using a magnetic material (the former and) requires a load current of about 200A and is complicated to mount.

The means for winding the water-repellent tape around the electric wire has a problem of aging deterioration of the tape.

The means for attaching the ring and the anti-twist weight are effective only in a very limited snow accretion state, and are not effective in accretion of ice.

It is extremely difficult for the means for giving shock vibration to transmit the vibration over the entire length in the span, and the effect is hardly obtained.

(Means for Solving Problems) The present invention provides an ice-and-snow electric wire that is difficult to solve the above-mentioned problems, and is characterized in that a metal pipe containing a hydrogen storage alloy is twisted into an overhead power transmission line. There is something to do.

1 and 2 are transverse cross-sectional views of specific examples of the hard-to-descend ice and snow wire of the present invention. FIG. 1 shows that the outermost layer of the stranded wire that constitutes the overhead power transmission line (1) has one strand of a metal pipe (2) such as an aluminum pipe containing an hydrogen storage alloy (3) or an aluminum alloy pipe twisted into it. Fig. 2 shows a metal pipe (2) containing a hydrogen storage alloy (3).
The multiple strands of the above are twisted into the outermost layer of the overhead transmission line (1).

(Operation) In the present invention, the hydrogen storage alloy accommodated in the metal pipe is one that absorbs hydrogen to form a metal hydrogen compound,
When H _{2 is} a hydrogen molecule of a gas and M is a metal element, a typical hydrogenation reaction is represented by M + H ₂ MH ₂ .

This reaction is reversible, and which direction the reaction occurs is determined by the pressure and temperature of hydrogen gas. If the temperature is constant and the pressure of hydrogen gas is equal to or higher than the equilibrium pressure specific to the metal, the reaction proceeds to form a metal hydride, and if the temperature is lower than the equilibrium pressure, the reaction proceeds to decompose hydrogen gas and metal.

Another basic property of metal hydrides is that they generate heat when hydrogen and a metal react with each other and absorb heat when the metal hydride decomposes. This thermal effect is relatively large and has various uses as an energy conversion material.

The present invention utilizes the heat generated when hydrogen and metal react, which is one of the basic properties of the metal hydride described above. To melt the ice and snow adhering to the overhead power transmission line, use a metal pipe. It suffices if the stored alloy occludes hydrogen to generate heat, and this can be implemented by attaching a control device for controlling the hydrogen gas pressure to the end portion of the electric wire.

Although there are various hydrogen storage alloys, the alloy used in the present invention has a high hydrogen storage / release rate.

 Performance does not deteriorate even after repeated storage and release of hydrogen.

 Large heat generation during hydride formation.

 It is cheap.

 It is lightweight.

The release temperature of hydrogen is lower than the heat-resistant temperature of aluminum alloy used for electric wires.

Alloys with features such as are preferable, specifically TiCo.TiC
Examples include alloys such as _0.5 Mn _0.5 .TiCo _0.75 5Ni _0.25 .

(Example 1) An aluminum pipe of an overhead transmission line having the structure shown in Fig. 1 was filled with a Ti _0.5 alloy as a hydrogen storage alloy so that voids remained in the pipe.

It was possible to control the hydrogen gas pressure in the pipe to 1 atm when icing started on the overhead power transmission line, and to melt the ice by an exothermic reaction.

The alloy for heat generation amount is large and -13.8Kcal / molH _2, it is effective for overhead power transmission lines to be used in particular occur icing prone conditions.

(Example 2) As shown in FIG. 2, four aluminum pipes having CaNi ₅ alloy filled in the outermost layer were twisted.

It was possible to melt the snow quickly by controlling the hydrogen gas pressure in the pipe to 0.4 atm when moist snow started to adhere to the overhead power line.

Since the dissociation temperature of this alloy is 30 ° C, the dissociation reaction (endothermic reaction) naturally occurs in the middle of summer, and it is also effective for cooling the wire surface.

Example 3 Ti _0.8 Zr _0.2 Mn _1.8 Mo _0.2 alloy as a hydrogen storage alloy was filled in an aluminum pipe of an overhead transmission line having the structure shown in FIG.

When dry snow started to adhere to the overhead power line, the hydrogen gas pressure in the pipe was controlled to 4 atm, and it was possible to melt the snow quickly.

In the above-mentioned Examples 1 to 3, under the meteorological conditions in which it is not necessary to melt the iced snow, when the hydrogen storage amount of the alloy is equal to or less than the saturation amount, the hydrogen gas pressure may be kept as it is, and the saturation amount is reached. If so, reduce the pressure to dissociate hydrogen.

Further, the above hydrogen storage alloy did not show any deterioration in performance such as calorific value even after repeated absorption and dissociation.

(Effect of the Invention) According to the above-mentioned hard-to-adhere ice and snow wire of the present invention, there is no need to attach a magnetic body, a ring or the like to the wire as in the conventional case
The metal pipe containing the hydrogen storage alloy is only twisted when the overhead transmission lines are twisted together, and the heat generated when the hydrogen storage alloy absorbs hydrogen is used to melt ice and snow, especially in cold regions. The effect is great as an overhead transmission line used.

[Brief description of drawings]

1 and 2 are transverse cross-sectional views of specific examples of the hard-to-descend ice and snow wire of the present invention. 1 ... Overhead transmission line, 2 ... Metal pipe, 3 ... Hydrogen storage alloy.

Claims (3)

[Claims] 1. An ice-and-snow electric wire that is difficult to reach, characterized in that a metal pipe containing a hydrogen storage alloy is twisted into an overhead power transmission line. 2. The ice-and-snow electric wire as set forth in claim 1, wherein a metal pipe containing a hydrogen storage alloy is twisted into the outermost layer of the overhead power transmission line. 3. The hard-to-ice ice and snow wire according to claim 1, wherein the surface temperature of the wire is controlled by a hydrogen gas pressure control device at the wire end.