JPH02246719A - Ring to protect against snow damage - Google Patents

Abstract

PURPOSE:To use the heat emission of a magnetic substance effectively by making the inside diameter of a magnetic substance ring composed of bisected bodies greater than the cable diameter with an elastic spacer inserted between them. CONSTITUTION:A magnetic substance ring 1 is composed of bisected bodies 11 and 12, which are assembled into the ring 1 by coupling them with a coupling section 1a. The inside diameter of the ring 1 is constituted greater than the outside diameter of a cable 10. A spacer 2 composed of an elastic body is interposed between the outside circumference of the cable 10 and the inner surface of the ring 1. Thus, no contact with the coupling section 1a will be insufficient by the variation of the outside diameter of the cable 10 due to the allowance. There is no fear that the heat emitted from the ring 1 is taken to the cable 10 because the ring 1 does not stick to the cable 10.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a snow damage countermeasure that prevents damage caused by lightning strikes by breaking snow caps on overhead power transmission lines into small pieces and causing them to fall. This relates to rings for use.

[Prior Art 1] There are two main types of damage that can occur when snow accumulates on overhead power transmission lines.

One is the case where snow adhering to the outer periphery of the electric wire rotates and grows as so-called pipe snow. In this case, there is a risk of line breakage, tower collapse, and serious accidents.
Various prevention measures have been proposed so far, including spirals and rings to prevent snow buildup, and weights to prevent twisting of electric wires.

The other problem is the damage that can occur due to falling snow caps on power lines.

Overhead power lines have a considerable ground clearance, and when large snowflakes fall from such a high place with high acceleration,
Its destructive power is surprisingly large, and there is a risk of causing unexpected harm to horizontal structures such as vinyl houses, agricultural products, and passersby.

Although it has become possible to take fairly effective measures against the damage caused by the above-mentioned snow pipes, studies on measures against the above-mentioned damage caused by falling snowpack are only just beginning.

From the standpoint of preventing damage caused by lightning strikes, an attempt has been made to attach rings l-11- made of magnetic material at predetermined intervals around the outer periphery of the electric wire 10, as shown in FIG.

The ring 1-, which is a magnetic material, generates heat due to hysteresis loss due to energization even without providing a separate heat source. If such magnetic rings 1-1 are installed at fairly narrow intervals, each ring 1-. This is based on the knowledge that the 1" portion melts due to heat generation, and as a result, the snow is divided into small pieces at intervals of ring 1-1" and falls in the form of small pieces, thereby preventing the lightning damage described above.

[Problem to be Solved by the Invention 1] The above is a theoretical theory, and even if an experiment is performed by actually covering electric wires with snow, the behavior will not match the theory.

In other words, even if a cylindrical ring as shown in Fig. 5 is installed, the heat dissipation surface is small and the snow melting effect is insufficient. Snow often falls in the form of large snowflakes several meters long.

In addition, in order to attach ring 1 to an existing electric wire, please refer to Figure 5 (
As shown in (b), it is necessary to construct the ring 1 into two halves and to connect them at the connecting portion 1-a.

However, there is a dimensional tolerance in the outer diameter of the electric wire 10, and if the outer diameter is large, there will not be sufficient contact at the joint 1-a, the heat generation of the magnetic body 1 will be drastically reduced, and the snow melting effect cannot be expected at the side bottom. On the other hand, if the outer diameter of the electric wire 10 is small, the coupling part 1-a of the ring 1- will make sufficient contact, but there will be a gap between the ring 1- and the outer peripheral surface of the electric wire 10 as shown in FIG. A gap g will be formed between. If there is such a gap g, there is a risk that the surface of the electric wire will be damaged when the electric wire 10 vibrates.

Furthermore, even when the inner diameter of the ring 1- and the outer diameter of the electric wire 10 match and the ring 1- is in close contact with the electric wire, the heat generated by the ring 1- is transferred to the electric wire by thermal conduction of the electric wire 10.
As a result, the amount of heat that contributes to snow melting decreases, which is also undesirable.

It is an object of the present invention to solve the problems of the prior art as described above, to make it possible to always completely connect a ring made of two halves, to make maximum use of thermal efficiency, and to make it possible for electric wires to The present invention aims to provide a novel snow damage prevention ring that can break snow into small pieces at the attached ring part and allow it to fall.

[Means for Solving the Problems] The first gist of the present invention is to make the inner diameter of the two-part ring larger than the outer diameter of the electric wire to which it is attached, and to provide elasticity in the gap formed thereby to hold it. The second point lies in the fact that a body spacer or a plastic ring is provided, and the second point is that the two-part body ring is tightened and fixed with a shaded ring.

[Function] If the inner diameter of the ring is larger than the outer diameter of the wire, perfect contact is always ensured at the coupling portion of the ring. If a spacer or the like is installed in the gap created by this, there is no risk of damage to the wire due to vibration, and since the ring does not come into close contact with the wire, the heat generated by the ring will not be absorbed by the wire.Furthermore,
If the ring is fixed with a shaded ring, lightning will be caught in the cavity, and snow attached to the ring will be difficult to move. As a result, the shearing of the snow at the ring portion is promoted, and the snow is divided into small pieces at each ring interval and falls.

[Example] The present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a state in which a magnetic ring 1 according to the present invention is attached to an electric wire 10, and FIG.
0 is a front view seen from the longitudinal direction of FIG.

As the material for the magnetic ring 1, it is preferable to use a low-cure-point material such as an iron-nickel alloy that has a curie point near the snowfall temperature, but such materials are very expensive and are not suitable for general use. From this point of view, there is no problem in using general structural steel materials.

The magnetic ring 1 is a two-part body 1s as shown in FIG.
A ring 1 is formed by connecting these through a connecting portion 1a.

When the ring 1 is formed in this way, the inner diameter of the ring 1 is configured to be larger than the outer diameter of the electric wire 10, and there is a groove between the outer peripheral surface of the electric wire 10 and the inner surface of the ring 1. A gap δ as shown in FIG. 1 is formed, and a spacer 2 made of an elastic body is interposed in the gap δ.

Since the configuration is as described above, even if there is a tolerance in the outer diameter of the electrode 110 and the outer diameter varies in size, there is no possibility that the contact of the joint portion 1a will be insufficient.

Further, a gap δ is formed between the electric wire 10 and the ring 1, and an elastic spacer 2 is interposed in this gap δ, so that even if vibration occurs in the wire, the ring 1 Therefore, there is no risk of damage to the outer surface of the electric wire 10.Furthermore, since the ring 1 is not in close contact with the electric wire 10, there is no risk of the heat generated by the ring 1 being taken away by the electric wire 10.

Note that 3 is a band for tightening and fixing the two halves 11 and 12, and as shown in FIG. 2, it can be bent at the bending part 5 and the ends can be connected by hook engagement. It serves to fix the two-part body 11, 12 to the electric wire 10 by tightening it from above.

FIG. 3 is a sectional view showing another embodiment according to the present invention,
The above tightening is intended to omit the band 3.

A locking protrusion 1b (this may be a recess) is formed on the ring 1, and a plastic ring 6 which also serves as a spacer is engaged with the protrusion 1b, and the ring 1 made of a split body is engaged with the protrusion 1b. It serves as a spacer to maintain the bond between the ring 1 and the jm gap of the ring 1.

With this configuration, there is an advantage that the band 3 can be omitted for the aforementioned tightening.

FIG. 4 is a sectional view showing still another embodiment of the present invention.

In this embodiment, a cylindrical portion 3a is formed in the tightening band 3 for tightening and fixing the ring 1.

This cylindrical portion 3a is intended to capture and fix snow.

In this case, the gap δ may be formed between the ring 1 and the electric wire 10, but the presence or absence of the gap is not particularly required, as long as the two halves are sufficiently joined.

According to this embodiment, snow is captured and fixed by the cylindrical portion 3a and melted by the heat generated by the ring 1. Then, the water generated by the melting snow moves along the twist of the electric wire 10, and the ring 1.
It penetrates into the lower part of the snow cap that exists between 1 and 2 and acts to accelerate the fall of the snow cap.

Thus, when the snow cap is about to slide and fall, the cylindrical portion 3a
Since the snow is fixed in place, a shearing force is generated between them, causing the snow to break up and fall into pieces with a length less than the distance between rings 1.1, and the snow does not fall in the form of snowflakes. , the damage caused by falling snow will be resolved.

Furthermore, if the band 3 is made of plastic, the band 3 will stretch under high temperatures above the snowfall temperature, reducing the force that tightens the ring 1, making the contact between the joints insufficient, and thereby providing a switching effect that reduces heat generation. be able to.

Moreover, if the snow cap is small, the fixing effect of the cylindrical portion 3a will work, and the snow will not fall, but will melt and disappear as the outside temperature rises.

[Effects of the Invention] As described above, according to the ring according to the present invention, it is possible to utilize the heat generated by the magnetic material very effectively, and it is also possible to reliably divide the snow cap into small pieces. Because I can,
Lightning strikes in snowpack conditions are eliminated, and snow damage during snowfall can be sufficiently prevented.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the ring according to the present invention, FIG. 2 is a front view thereof, FIGS. 3 and 4 are cross-sectional views showing other embodiments of the present invention, and FIG. 5 is a conventional ring. Figure 6 shows the installation status of the ring, where (a) is a sketch, (b) is a front view seen from the longitudinal direction of the wire, and Figure 6 is when the inner diameter of the ring is larger than the outer diameter of the wire. (a) is a cross-sectional view thereof, and (b) is a front view seen from the longitudinal direction of the electric wire. 1.1-: Magnetic ring, 12: Two-part body, a: Joint part, 1b: Locking protrusion, 2: Elastic spacer, 3: Tightening band, 3a: Cylindrical part, 6: Plastic ring , 10: Electric wire. la. Agent Patent Attorney Fujio Sato 4 Figure 5 Figure 1 Figure 2 3 Figure 6

Claims (3)

[Claims] (1) A snow damage countermeasure consisting of a two-part magnetic ring that can be installed with a predetermined gap between it and the outer circumference of the electric wire, and a spacer made of an elastic body is provided to maintain the gap. ring. (2) Consists of a magnetic ring made of two parts that can be attached with a predetermined gap between the outer periphery of the electric wire, and a locking protrusion or recess is formed on the magnetic ring, and the locking protrusion or recess is formed on the magnetic ring. A ring for snow damage prevention in which a plastic ring is engaged with a protrusion or a recess to maintain the gap. (3) A snow damage prevention ring consisting of a two-piece magnetic ring that can be attached to the outer periphery of an electric wire, and a band with a shade that can be tightened and fixed on the outer periphery of the ring.