JPH067113U - Lightning resistant ground line - Google Patents

Abstract

(57) [Summary] [Structure] One or more heat-resistant wires 3 in which an inorganic heat-resistant material 3b is covered with a conductive metal sheath 3a are tightly wound around the outer circumference of the ground wire 2 or The lightning resistant ground wire 1 was constructed by twisting. [Effect] When there is a lightning strike on the lightning-resistant ground wire 1, the conductive metal sheath 3a of the heat-resistant strand 3 wound tightly around the ground wire 2 is damaged, but the inorganic heat-resistant material inside the conductive metal sheath 3a is damaged. 3b
As a result, the arc heat is blocked and damage to the ground wire 2 is prevented.
In addition, when the heat resistant strand 3 is mixed and twisted with the ground wire 2,
One segment conductor that makes up
Even if the heat is melted, the heat-resistant wire 3 blocks the arc heat, so that damage and melt damage to other segment conductors can be effectively prevented, and damage to the ground wire can be minimized.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lightning resistant ground wire.

[0002]

[Prior art]

 Conventionally, overhead ground wires have been used to prevent damage to transmission lines due to arc energy caused by lightning and also to prevent electromagnetic induction disturbances. Further, in recent years, with the advent of the composite overhead ground wire (0PGW), the overhead ground wire plays a role as an information transmission path, and the importance thereof is dramatically increasing. For this reason, damage to the overhead ground wire due to lightning strikes will cause great damage to all areas.

As the above-mentioned lightning resistant ground wire which prevents damage to the overhead ground wire,

(1) A lightning-proof area in which a steel core is composed of a smooth body stranded wire, aluminum pipes are coated in multiple layers on the outer periphery thereof so as to have a required sectional area structure, and a high melting point material is provided between the layers of the aluminum pipes. Line (see JP-A-2-273408),

(2) Lightning-proof ground wire based on the so-called armor rod idea in which a melting layer is provided on the outermost layer of the ground wire in which a plurality of conductive metal element wires are twisted (Electrical Joint Research Vol. 43, No. 3, Showa (See issued in January 1988),

(3) A melt-damage layer is provided on the outermost layer of a ground wire in which finned wires are mixed and twisted between wires having a segmented cross-sectional shape, and thermal insulation is provided between the ground wire and the melt-damage layer. Lightning-proof ground wire with a void layer with excellent characteristics (refer to the National Conference of the Institute of Electrical Engineers of Japan N0.1213),

(4) A lightning resistant ground wire in which the outermost layer wire that constitutes the ground wire is coated with a high melting point material (for example, ceramic) (see National Conference of the Institute of Electrical Engineers of Japan N0.1213),

(5) A erosion body made of a metal body spirally preliminarily formed in each section is wound around the outer circumference of the overhead wire whose entire length is divided into multiple sections so as to cover the entire outer peripheral surface of the overhead wire. It is known that the lightning-resistant ground wire is closely attached (see Jpn.

[0009]

[Problems to be solved by the device]

 However, each lightning protection ground wire constructed as described above has the following problems.

In the lightning-resistant ground wire mentioned in (1), not only is the productivity extremely low due to the complicated manufacturing process of providing the high melting point material between the layers of the aluminum pipe, but also the wire outer diameter is large and the weight is heavy. There is a point.

In the lightning resistant ground wire mentioned in (2), a large diameter conductive metal element wire is used for the damage layer in order to prevent arc melting damage of the damage layer due to lightning from reaching the ground wire. Since the ground wire and the damage layer are in close contact with each other, there is a risk that damage to the damage layer will not be limited to damage to the ground wire if the arc energy due to lightning is large. .

The lightning resistant ground wire mentioned in (3) is excellent in arc resistance as described in the paper N0.1213 of the National Meeting of the Institute of Electrical Engineers of Japan, but has a problem in mechanical characteristics. That is, the ground wire passes through 5 to 10 or more gold wheels at the time of extension, and in some cases, it passes through the gold wheels more times with high tension. At this time, if the height difference between the steel towers is large, the drag wheel resistance is also large, and the fins are crushed by the crushing force due to the vertical component force, which causes large nicking in the melted layer, and the laughter is also large, and the predetermined gaps are created. Further, there is a possibility that the erosion layer may not be obtained, and further, the thawed layer may adhere to the internal strands and a sufficient lightning protection effect may not be obtained.

In the lightning-resistant ground wire mentioned in (4), not only is it difficult to thickly coat the outermost layer wire with a high melting point material (for example, ceramic), but also according to the National Meeting of the Institute of Electrical Engineers of Japan N0.1213. As described above, the lightning protection effect cannot be expected compared to the above-mentioned lightning protection ground wire of (3).

In the lightning resistant ground wire mentioned in (5), it takes a lot of time and effort to densely install and adhere the infusible body to each predetermined section after the overhead wire, and the wire has a large outer diameter and a heavy weight. There is.

The present invention has been made in view of the above problems, and an object thereof is to provide a lightning-resistant ground wire having excellent lightning-proof characteristics.

[0016]

[Means for Solving the Problems]

 The present invention is a lightning-resistant ground wire constructed by tightly winding one or more heat-resistant wires covered with an inorganic heat-resistant material with a conductive metal sheath on the outer circumference of the ground wire or twisting the ground wire to form a lightning-proof ground wire. It is a solution to the problem.

[0017]

[Action]

 The ground wire prevents arc melting and breakage due to lightning strikes of the transmission line, prevents electromagnetic induction damage, and functions as an information transmission line.

The heat resistant wire functions to block the arc heat due to lightning stroke. That is, if there is a lightning strike on the heat-resistant wire, the conductive metal sheath is damaged, but the arc heat is blocked by the inorganic heat resistant material in the conductive metal sheath, and the ground wire is prevented from being damaged by the arc heat. Also, when the heat-resistant wire is mixed and twisted with the ground wire, even if one segment conductor that composes the ground wire is damaged or melted by direct lightning, the heat-resistant wire cuts off the arc heat. Damage to conductors and melting damage are effectively prevented, and damage to the ground wire is minimized.

[0019]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 is a cross-sectional view showing an embodiment of the present invention, FIG. 2 is a side view, and in the drawing, 1 is a lightning-resistant ground wire, 2 is a ground wire constituting the lightning-resistant ground wire 1, and aluminum, copper, stainless steel, etc. The segment conductor 2b made of aluminum, copper or the like is twisted on the pipe 2a made of a conductive metal. 2c is a tension member made of steel wire or the like. 3 is a heat-resistant element wire wound tightly around the ground wire 2. The heat-resistant element wire 3 is an inorganic heat-resistant material 3b such as magnesium oxide, asbestos, gypsum, and a conductive metal sheath 3a made of copper, stainless steel or the like. It is configured by coating.

In order to provide the heat-resistant elemental wire 3 on the ground wire 2 in a close-packed manner, one heat-resistant elemental wire 3 is wound on the ground wire 2 in a close-contact manner or wound in advance. A plurality of heat-resistant element wires 3 formed in a spiral shape of up to 3 m are provided in close contact with the ground wire 2 in a dense manner. Also, the heat-resistant wire 3 should not be allowed to share the tension in the installed state.

When there is a lightning strike on the lightning-resistant ground wire 1 of the present invention configured as described above, the conductive metal sheath 3a forming the heat-resistant element wire 3 is damaged by the arc energy due to the lightning stroke, but the non-heat-resistant material 3b. As a result, the arc heat is blocked and damage to the ground wire 2 is prevented.

FIG. 3 is an explanatory view showing another embodiment of the present invention, in which a metal conductor 3c of aluminum, copper, steel or the like is covered with an inorganic heat-resistant material 3b of magnesium oxide, asbestos, gypsum or the like, and aluminum or the like is formed thereon. A plurality of heat-resistant element wires 3 formed in a segment shape by covering a conductive metal sheath 3a made of is formed between segment conductors 2b and 2b in which a high melting point metal wire made of steel, stainless steel, copper or the like is covered with aluminum or the like. The lightning resistant ground wire 1 is constructed by mixing and twisting.

By configuring the lightning resistant ground wire 1 as described above, even if one segment conductor 2b that constitutes the lightning resistant ground wire 1 is damaged or melted by the arc energy due to a direct lightning strike, Since the adjacent heat-resistant wires 3 block the arc heat, the other segment conductors 2b are not damaged by the arc heat, and the damage to the ground wire is minimized. Further, since the metal conductor 3c in the conductive metal sheath 3a constituting the heat resistant strand 3 is also insulated by the inorganic heat resistant material 3b, it is not damaged and the electrical and mechanical strength of the ground wire is reliably maintained.

FIG. 4 is an explanatory view showing still another embodiment of the present invention, in which a metal conductor 3c made of aluminum, copper, steel or the like is covered with an inorganic heat-resistant material 3b made of magnesium oxide, asbestos, gypsum, etc. A lightning resistant ground wire 1 is constructed by twisting a plurality of heat resistant wires 3 covered with a conductive metal sheath 3a made of aluminum or the like on a ground wire 2.

By configuring the lightning resistant ground wire 1 as described above, the conductive metal sheath 3a is damaged by the arc energy due to the lightning stroke as described above, but the arc heat is blocked by the inorganic heat resistant material 3b. The wire 2 is not damaged, and the metal conductor 3c in the conductive metal sheath 3a is also insulated by the inorganic heat-resistant material 3b, so that the wire is not broken, and the electrical and mechanical strength is reliably maintained. .

As shown in FIGS. 3 and 4, the heat-resistant elemental wire 3 is covered with an inorganic heat-resistant material 3b such as magnesium oxide, asbestos or gypsum on the metal conductor 3c, and a conductive metal made of aluminum or the like is formed thereon. By constructing by covering the sheath 3a, the conductive metal sheath 3a is made of the same metal "aluminum" as the segment conductor 2a constituting the ground wire 2, and the metal conductor 3c is made of a metal wire excellent in heat resistance and tensile strength "eg stainless steel. It is possible to improve lightning resistance and mechanical strength. That is, in the case of aluminum and stainless steel, which have a significant tendency for contact corrosion, the presence of water causes a local battery action, but the inorganic heat resistant material 3b is interposed between the conductive metal sheath 3a and the metal conductor 3c. Therefore, there is no possibility of causing a local battery action, and a lightning resistant ground wire with excellent lightning resistance and mechanical strength can be obtained. When the conductive metal sheath 3a is a copper sheath in order to minimize damage to the ground wire due to direct lightning, the copper sheath 3a is plated with zinc or tin so that By preventing the local battery action that occurs, the lightning protection effect can be improved.

[0027]

[Effect of device]

 According to the present invention, as described above, one or more heat resistant wires 3 in which the inorganic heat resistant material 3b is covered with the conductive metal sheath 3a are densely wound around the outer circumference of the ground wire 2 or the ground wire 2 is wound. By constructing the lightning proof ground wire 1 by being twisted with each other, there is an excellent advantage that the conventional defect can be eliminated, and the lightning proof ground wire 1 which is lightweight and has excellent lightning resistance characteristics can be provided.

[Brief description of drawings]

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

[Figure 2] Side view

FIG. 3 is a cross-sectional view showing another embodiment of the present invention.

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

[Explanation of symbols]

1 lightning resistant ground line 2
Ground wire 3 Heat resistant element wire 3a
Conductive metal sheath 3b Inorganic heat resistant material

Claims (1)

[Scope of utility model registration request] 1. A lightning-resistant ground wire, characterized in that one or more heat-resistant wires covered with an inorganic heat-resistant material with a conductive metal sheath are densely wound around the outer circumference of the ground wire or twisted around the ground wire. .