JP2586758Y2 - Lightning-resistant overhead ground wire - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightning-resistant overhead ground wire.

[0002]

2. Description of the Related Art Conventionally, overhead ground wires are prevented from being damaged or broken by electric energy caused by a lightning strike.
It has been used to prevent electromagnetic induction interference. In recent years, with the emergence of the compound overhead ground wire (OPGW), the overhead ground wire has come to play a role as an information transmission line, and its importance has increased dramatically. doing. For this reason, damage to the overhead ground wire due to lightning strikes will cause enormous damage to various areas.

As shown in FIG. 2 , an erosion layer 21 is provided on the outermost layer of a ground wire 20 in which a plurality of conductive metal wires are twisted as a lightning-resistant overhead ground wire which prevents damage to the overhead ground wire due to a lightning strike . A lightning-resistant overhead ground wire based on the so-called armor rod concept has been known by Electric Cooperative Research Vol. 43, No. 3, issued in January 1988.

Further , an air insulating layer is interposed on the outer periphery of the electric wire.
To provide a pipe-shaped erosion layer,
An integrally projecting support portion of the same molten material is provided.
Parts provide mechanical support between the wire and the erosion layer.
Patent which is adapted to electrically connect the wire and the melting layer
No. 3-17908 is known.

[0005]

The problem to be solved by the present invention is shown in FIG.
In a conventional lightning-resistant overhead ground wire, a metal wire having a large diameter is used for the erosion layer 21 in order to prevent the arc erosion of the erosion layer 21 due to a lightning strike from reaching the ground wire 20. For this reason, the weight increases, and the ground wire 20 and the erosion layer 21 are in close contact with each other. If the arc energy due to lightning is large, there is a danger that not only the erosion layer 21 but also the ground wire 20 may be damaged. There were some problems.

[0006] Further , the lightning protection wire disclosed in the patent application is disclosed.
Has a projection formed of the same material on the inner surface of the pipe-shaped erosion layer.
Therefore, the heat of fusion of the pipe-shaped erosion layer
The protrusions of the molten material concentrate on
The heat of fusion of the material projections
As it is transmitted to the twisted strand and blows it,
Even if a square pipe-shaped erosion layer is provided, the electric wire cannot be reliably protected
There is a problem.

An object of the present invention is to solve the above-mentioned problems and to provide a lightning-resistant overhead ground wire that is lightweight and that can reliably prevent ground wire damage due to lightning strike.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a sector element wire 2 having a circular outer peripheral surface and a sector cross section.
And a ridge 4 is integrally formed on the outer surface of the fan
Twist the fan-shaped element wire 3 with the ridge on the outer peripheral surface.
Combine ground wire 1 from the above-mentioned sector wire
1 is in contact with the outer peripheral surface of the ridge 4 projecting helically on the surface.
By providing the erosion layer 5, a lightning-resistant overhead ground wire is formed.

[0009]

The ground wire prevents arc damage and disconnection due to the lightning strike of the transmission line, and also functions as an electromagnetic interference prevention and information transmission path.

When the ground wire is struck by lightning, the outermost erosion layer 5
Is melted and damaged by high-temperature arc energy,
The projecting ridges 4 of the fan-shaped element wire 3 with the projecting rim on the outer peripheral surface of the present invention are as described above.
Like the lightning protection wire published in the license application,
Melt material projections are provided integrally on the inner peripheral surface to
The wire that has been melted and the heat of fusion is in contact with the tip of the protrusion
Unlike the configuration that melts the twisted strand of
4 is not the structure provided integrally with the erosion layer 5 with the same material.
Then, the erosion layer 5 is eroded, and some erosion is caused on the peripheral surface of the ridge 4.
Even if such a situation occurs, it does not
There is no loss. Therefore, the matching ground wire 1 is
Secure protection from lightning strikes.

The erosion layer 5 and the sector wire are joined together to form a ground wire.
A gap 6 having high thermal insulation properties is formed between
The fusion heat of the eroded layer matches the
The ground line 1 is not damaged because it does not reach the ground line 1.
No.

[0012]

FIG. 1 is a cross-sectional view of an embodiment of the present invention. 2 is a conductive gold having a fan-shaped cross section with a circular outer surface.
Metal element wire (so-called fan element wire), 3 is conductive
Protruding in the length direction of the element wire on the outer peripheral surface of
Sector wire with a projecting ridge on the outer peripheral surface with a fan-shaped cross-section that integrally projects 4
(So-called finned wire with a fin). This fan element wire 2
And twist the fan-shaped element wire 3 with the ridge on the outer peripheral surface.
The joining ground line 1 is formed. In this way, both fan-shaped wires 2
A ground wire formed by spirally joining fan-shaped wires 3 with ridges on the outer peripheral surface
Reference numeral 1 denotes a shape in which a ridge 4 projects spirally on the outer periphery.

Reference numeral 5 denotes a erosion layer, which is formed by combining the above-mentioned sectoral wires.
On the outer peripheral surface of the ridge 4 projecting spirally on the outer periphery of the
Contact and coat in a tube. Outside the spiral ridge 4
Between the erosion layer 5 provided in contact with the peripheral surface and the inner peripheral surface of the sector wire;
A gap 6 is formed between them. This erosion layer 5 is made of aluminum,
Metal tube shape with the forming the thin plate made of stainless steel
When building the ground wire 1 between the towers,
Cover the outer circumference with a metal tube, or split short metal tube
Provided over the body, or tape of aluminum, stainless steel, etc.
Is provided by wrapping.

In the lightning-resistant overhead ground wire of the present invention configured as described above , the outermost eroded layer 5 is melted and damaged by high-temperature arc energy when struck by lightning .
Like the lightning protection wire published in the application,
Since the molten material projection is provided integrally on the peripheral surface,
In both cases, the protruding part of the molten material is damaged and the heat of melting
What melts the twisted strand of the wire that is touching the end
Differently, the ridge 4 of the fan-shaped element wire 3 with the ridge on the outer peripheral surface of the present invention.
Is the same material as the erosion layer 5 and is provided integrally
As a result, the erosion layer 5 is eroded by a lightning
Even if a small amount of erosion may occur,
Without damaging, secure the ground wire 1 from the lightning stroke from the fan element wire.
Can be protected.

In addition, the lightning-resistant overhead ground wire of the present invention has
Between the ground wire 1 and the ground wire 1
Since the gap 6 is formed, the heat of fusion of the eroded layer remains unchanged.
Because it does not reach the ground line 1 from the inner fan wire,
The ground wire 1 is not damaged.

The lightning-resistant overhead ground wire shown in FIG.
Collect the optical fiber cable at the center of the
To form a so-called composite overhead ground wire (OPGW)
No.

[0017]

[Effect of the Invention] As described above, the lightning-resistant overhead ground wire of the present invention is used.
Is twisted together with the fan-shaped element wire and the fan-shaped element wire
A erosion layer is provided on the outer peripheral surface of the ridge 4 projecting in a spiral shape.
Therefore, the erosion layer 5 is melted by the lightning
Even if erosion may occur, the sector wire is eroded.
Instead, the ground wire can be reliably protected from lightning strikes. Sa
In addition, the eroded layer is formed between the ground wire
The heat of melting of the eroded layer is fan-shaped
There is no danger of melting the ground wire than the strand. Accordingly
It is not necessary to use a metal wire of larger diameter in corrosion layer as in the conventional Te is economical to configure a lightweight lightning protection ground wire
Can be

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a conventional lightning-resistant overhead ground wire;

[Explanation of symbols]

1: twisted ground wire 2: fan-shaped wire 3: fan-shaped wire with outer ridges 4: ridges 5: erosion layer

──────────────────────────────────────────────────続 き Continuation of the front page (72) Koji Yoshida, creator Furukawa Electric Co., Ltd. 2-6-1 Marunouchi, Chiyoda-ku, Tokyo (56) Reference JP-A-3-17908 (JP, A) (58) Field surveyed (Int.Cl. ⁶ , DB name) H01B 5/08-5/10

Claims (1)

(57) [Scope of request for utility model registration] 1. A fan element wire having an outer peripheral surface having a circular curved surface and a sector cross section.
An outer periphery with a ridge integrally projecting in the length direction on the outer surface of the surface fan
Combine with a fan-shaped element wire with a convex ridge to fit
Construct a ground wire, and tie it from the sector wire to the surface of the ground wire.
A erosion layer is provided in contact with the outer peripheral surface of the ridge projecting spirally.
Lightning overhead ground wire, characterized in that digit.