JP5253870B2 - Running water prevention cable - Google Patents

Description

  The present invention relates to a running water prevention cable, and more particularly to a running water prevention cable including a winding layer of a conductive wire woven tape and a winding layer of a water-absorbing semiconductive tape between a cable core and a metal sheath.

  A running water prevention cable is known in which a water-absorbing or non-water-absorbing conductive wire weaving tape and a water-absorbing semiconductive tape are butt-wound around the outer periphery of the cable core, and a metal sheath is provided on the outside thereof (see FIG. For example, see Patent Documents 1 and 2.)

  FIG. 9 shows an example of such a running water prevention cable. In this figure, this water-carrying prevention cable has a water-absorbing conductive wire woven tape on the outer periphery of a cable core 1 comprising an inner semiconductive layer 1b, a crosslinked polyethylene insulator 1c and an outer semiconductive layer 1d provided on a conductor 1a. 2 and the water-absorbing semiconductive tape 3 are butt-wound, and a corrugated metal sheath 4 is provided on the outside. In FIG. 9, 5 is an internal water-absorbing semiconductive tape, and 6 is a protective coating layer.

  In this water-carrying prevention cable, the water-absorbing conductive wire weaving tape 2 is wound together in order to ensure an electrical connection between the external semiconductive layer 1 d constituting the cable core 1 and the corrugated metal sheath 4. However, as shown in FIG. 9, the portion A where the conductive wire woven tape 2 is exposed to the outer surface is in contact with the corrugated metal sheath 4 but is not exposed, that is, disposed inside the water-absorbing semiconductive tape 3. The portion B that is present is not in direct contact with the corrugated metal sheath 4. For this reason, the charging current (indicated by an arrow in the figure) flows through the conductive wire weaving tape 2 in the portion B without escape to the corrugated metal sheath 4. In this case, if the electric resistance of the conductive wire woven tape 2 is large, a high voltage (about 100 V) may be generated in the portion B. Then, due to expansion / contraction of the crosslinked polyethylene insulator 1c, when the contact surface of the conductive wire weaving tape 2 and the internal water-absorbing semiconductive tape 5 in the part B is separated or contacted again, there is a risk of discharge in the part.

  Even when the metal sheath is not a corrugated metal sheath 4 but a smooth metal sheath, the portion where the conductive wire woven tape 2 is exposed to the outer surface is in contact with the smooth metal sheath, but the portion not exposed is in direct contact. As a result, similar problems arise.

  Therefore, for such a problem, a conductive wire woven tape is wound around the outer periphery of the cable core, a good conductive member such as an annealed copper braided wire is disposed on the cable core, and a water-absorbing semiconductive tape is placed on the gap. A method of winding has been proposed (see, for example, Patent Document 3).

  However, in this method, since the water-absorbing semiconductive tape is gap-wrapped, there is a concern that the water-absorbing semiconductive tape may be bent or cut when the corrugated metal sheath is processed thereon. When the tape break occurs, the tape may be loosened and clogged in the metal sheath. Further, since the good conductive member directly contacts the corrugated metal sheath at the gap portion of the water-absorbing semiconductive tape, there is a concern that the good conductive member may be cut.

In the case of a smooth metal sheath, there is a gap between the good conductive member exposed at the gap portion of the water-absorbing semiconductive tape and the smooth metal sheath, and this gap is further increased due to the expansion / contraction of the crosslinked polyethylene insulator. There is concern. For this reason, there is a possibility that the charging current cannot be sufficiently released to the smooth metal sheath.
JP-A-6-168630 Japanese Patent Laid-Open No. 9-320355 JP 2000-353433 A

  The present invention has been made to solve the above-described problems of the prior art, and includes a running-water prevention cable including a winding layer of a conductive wire woven tape and a winding layer of a water-absorbing semiconductive tape between a cable core and a metal sheath. Therefore, it is an object of the present invention to provide a running water prevention cable that can sufficiently release the charging current to the metal sheath and can prevent the occurrence of tape breakage during the metal sheath processing.

In order to achieve the above object, according to one aspect of the present invention, a metal good conductive member is vertically or spirally wound around the outer periphery of a cable core, and a conductive wire woven tape and a water absorbent semiconductive tape are placed on the metal conductive material. tape semiconductive tape is wound combined as the gap winding, Ri formed by providing a corrugated metal sheath to conduct the tape narrowing woven conductive wire thereon, the gap width of said absorbent semiconductive tape, narrowing woven conductive wire about Hashirimizu prevent cable, wherein 5% to 70% der Rukoto of the tape width.

  In another aspect of the present invention, a good conductive member is wound vertically or spirally around the outer periphery of the cable core, and the water-absorbing semiconductive tape is wound around the wire woven tape and the water-absorbing semiconductive tape on the cable core. The present invention relates to a running water-preventing cable characterized in that it is wound together as described above and a smooth metal sheath is provided thereon.

  Furthermore, in another aspect of the present invention, a first good conductive member is vertically attached or spirally wound around the outer periphery of the cable core, and a conductive wire woven tape and a water-absorbing semiconductive tape are placed on the first good conductive member. The present invention relates to a running-water prevention cable characterized in that it is wound together so as to be wound in a gap, and a second good conductive member is vertically or spirally wound thereon, and a smooth metal sheath is provided thereon.

  According to the running water prevention cable of the present invention, it is possible to sufficiently release the charging current to the metal sheath, and it is possible to prevent the occurrence of tape breakage during the sheath processing.

  Embodiments of the present invention will be described below. Although the description will be made based on the drawings, the drawings are provided for illustration only, and the present invention is not limited to the drawings. It should be noted that the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the thickness of each layer, and the like are different from the actual ones. Furthermore, in the following description, components having the same or substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted.

(First embodiment)
FIGS. 1 and 2 are a partial longitudinal sectional view and a transverse sectional view showing a water-carrying prevention cable according to a first embodiment of the present invention, respectively, and FIG. 4 is a plan view showing a conductive wire woven tape used in the present embodiment. It is. 5 and 6 are a partially cutaway longitudinal sectional view and a longitudinal sectional view showing a main part of the running water prevention cable shown in FIGS. 1 and 2, respectively.

  In FIG. 1, the running prevention cable of this embodiment includes a cable core 11 of a 220 kV class running prevention cable having an outer diameter of about 110 mm, and an internal water-absorbing semiconductive tape sequentially provided on the cable core 11. A wound layer 12, a good conductive member 13, a combined wound layer 16 of a conductive wire woven tape 14 and a water-absorbing semiconductive tape 15, a corrugated aluminum sheath as a metal sheath 17, and a protective coating layer 18 made of rubber / plastic resin; It is composed of As the metal sheath 17, a so-called annular sheath in which annular crests and troughs are alternately repeated may be used, or a smooth metal sheath such as a smooth lead sheath may be used.

The cable core 11 has an inner semiconductive layer 11b having a thickness of about 1.5 mm, an insulator 11c made of cross-linked polyethylene having a thickness of about 23.5 mm, on the outer periphery of a conductor 11a made of a five-part compressed conductor having a nominal cross-sectional area of 2000 mm ² . The outer semiconductive layer 11d having a thickness of about 1.0 mm is sequentially extrusion coated. The cable core 11 is not limited to the 220 kV class, and the conductor 11a is not limited to the five-division compressed conductor.

  The internal water-absorbing semiconductive tape winding layer 12 is provided as necessary, and is configured by, for example, wrapping or gap winding one or more water-absorbing semiconductive tapes. In addition, when there is no risk of a water passage between the outer semiconductive layer 11d, a non-water absorbent semiconductive tape may be used instead of the water absorbent semiconductive tape. Furthermore, it is possible to wind both a water-absorbing semiconductive tape and a non-water-absorbing semiconductive tape. The gap between the conductors 11a is filled with a watertight material (not shown).

The good conductive member 13 is composed of a tin-plated annealed copper braided wire (0.1 mm × 256 pieces) having a cross-sectional area equivalent to 2 mm ² , and is vertically attached on the internal water-absorbing semiconductive tape winding layer 12 or a predetermined It is wound in a spiral at a pitch. The good conductive member 13 is arranged to conduct between the conductive wires 14a of the conductive wire weaving tape 14 (see FIG. 5), and therefore the cross-sectional area is, for example, about 0.125 mm ² or more in the case of one. Preferably, 0.5 mm ² or more is sufficient. In the example of FIG. 2, one good conductive member 13 is arranged on the inner water-absorbing semiconductive tape winding layer 12, but contact between the good conductive member 13 and the conductive wire 14 a of the conductive wire weaving tape 14 is made. For more certainty, a plurality of them may be arranged. In this case, it is preferable to arrange the plurality of good conductive members 13 at substantially equal intervals in the circumferential direction. In addition to tin-plated annealed copper braided wire, annealed copper wire, tin-plated annealed copper wire, aluminum wire, annealed copper strand wire, tin-plated annealed copper strand, aluminum strand wire, annealed copper braided wire, metal tape such as copper tape, aluminum tape, and A laminate tape of a metal tape such as lead, aluminum or copper and a plastic layer can be used. When a metal tape or a laminate tape is used as the good conductive member 13, a protrusion 13a as shown in FIGS. 3 (a) to 3 (c) is provided in order to ensure conduction with the conductor 14a of the conductor woven tape 14. The inner water-absorbing semiconductive tape winding layer 12 may be vertically attached so that 13a is on the upper side, or may be wound spirally at a predetermined pitch. FIG. 3A shows an example in which one protrusion 13a is provided along the length direction, and FIG. 3B shows an example in which a plurality of width direction protrusions 13a are provided at intervals in the length direction. FIG. 3C shows an example in which a plurality of protrusions 13a inclined at a predetermined angle with respect to the width direction are provided at intervals in the length direction. In addition, the cross-sectional shape of the protrusion 13a may be a triangle, a rectangle, a semicircle, or the like as shown in FIGS.

  The combined winding layer 16 of the conductive wire woven tape 14 and the water absorbent semiconductive tape 15 is wound with a gap width G of the water absorbent semiconductive tape 15 of 1/3 (about 33%) of the tape width of the conductive wire woven tape 14. It is wound together.

As shown in FIG. 4, the conductive wire weaving tape 14 is composed of a plain weave of rayon yarn or suf yarn a from No. 20 and a soft copper wire b having a diameter of 0.26 mm as the conductive wire 14a. The number of driven rayon yarns or staple yarns a is 170 in the longitudinal direction with a width of 60 mm, and for each of them, one soft copper wire b is woven, for a total of 20 pieces. In the lateral direction, 16 rayon yarns or suf yarns a having 2 inches from the 20th in the width are arranged. In addition, as the conducting wire woven tape 14, a tape having a thickness of about 0.3 to 0.6 mm and a width of about 50 to 75 mm is preferably used. Moreover, it is good also as a tin plating annealed copper wire instead of the annealed copper wire b. Furthermore, semiconductive property may be imparted to the conductive wire weaving tape 14 by applying a semiconductive paint to the conductive wire weaving tape 14 and drying, or a volume resistivity of about 5 × 10 ⁵ Ω · cm or less. By applying and drying a semiconductive paint containing a water-absorbing polymer on the conductive wire weaving tape 14, the conductive wire weaving tape 14 is semiconductive (volume resistivity 5 × 10 ⁵ Ω · cm or less) and absorbs water (height of water absorption). 5 mm or more). In any case, the configuration of the conductive wire woven tape 14 is determined by the operating voltage of the cable, the charging current, the ease of winding, and the like, and is not limited to the above configuration.

  The water-absorbing semiconductive tape 15 is coated with a semiconductive paint on one side of a 0.5 mm thick canvas, a semiconductive paint containing a water-absorbing polymer is applied on the other side, and if necessary on the coated layer, The cover layer is made of a thin non-woven polyester fabric. As the water-absorbing semiconductive tape 15, a double-sided water-absorbing semiconductive tape in which a semiconductive paint containing a water-absorbing polymer is applied to both sides of the canvas may be used. In the case where a double-sided water-absorbing semiconductive tape is used, it is possible to further improve the water running prevention characteristics between the inner water-absorbing semiconductive tape winding layer 12 and the water-absorbing semiconductive tape 15 winding layer. Moreover, as a base material of the water absorbing semiconductive tape 15, a nonwoven fabric, a woven fabric, etc. can be used other than a canvas. Further, the water-absorbing semiconductive tape 15 may have a tape width different from that of the conductive wire woven tape 14, but the width is substantially the same as that of the conductive wire woven tape 14 from the viewpoint of ease of winding and running water prevention performance. Is preferably used.

  As the water-absorbing polymer, one or more kinds of polymers that have been conventionally used for this kind of use such as acrylate soda cross-linked products and vinyl acetate / acrylate ester copolymer saponified products are appropriately selected. Can be used.

  The gap width G of the water-absorbing semiconductive tape 15 in the laminated winding layer 16 composed of the conductive wire woven tape 14 and the water-absorbing semiconductive tape 15 is not particularly limited, but charging current retention is prevented. From the viewpoint of water running prevention performance and the like, a range of 5 to 70% of the tape width of the conductive wire woven tape 14 is preferable, and a range of 20 to 50% is more preferable. About 33%) is particularly preferred. However, in this case, in FIG. 5 and FIG. 6, the conductor interweaving tape 14 at the portions indicated by P and Q, that is, the gap portion of the water absorbent semiconductive tape 15 and the portion overlapping the outside of the water absorbent semiconductive tape 15. Each includes at least one conducting wire 14a. When at least one conducting wire 14a is not included in each of the gap portion P and the overlapping portion Q, all the conducting wires 14a of the conducting wire woven tape 14 are electrically connected to the metal sheath 17 regardless of the gap width G. The charging current cannot be prevented from staying.

  On the combined winding layer 16 of the conductive wire weaving tape 14 and the water-absorbing semiconductive tape 15, a metal sheath 17 such as a corrugated aluminum sheath (the trough portion 17 a in the corrugated metal sheath) is provided with the gap portion P and It is provided so as to be in direct contact with each conductive wire 14a of the conductive wire weaving tape 14 in the overlapping portion Q, and a covering coating layer 18 is provided thereon.

In the water run prevention cable of this embodiment, the conductive wire woven tape 14 and the water absorbent semiconductive tape 15 are wound together so that the water absorbent semiconductive tape 15 is gap-wrapped, and the highly conductive member 13 is disposed immediately below the wound tape. In addition, since the metal sheath 17 is provided so as to be in direct contact with each conductor 14a of the conductor weaving tape 14 in the gap portion P and the overlapping portion Q of the water absorbent semiconductive tape 15, the conductor sheathing tape 14 and the water absorbent The conductive wire 13a and the conductive wire 14a of the conductive wire woven tape 14 facing the conductive member 13 are surely conducted by pressing due to the tape winding tension of the laminated winding layer 16 of the semiconductive tape 15 or pressing due to the weight of the cable core. the conductor 14a can be electrically connected to the metal sheath 17, preventing the occurrence of discharge due to accumulation of conventional such charging current It can be.

  In the running water prevention cable of the present embodiment, the tape portion in contact with the metal sheath 17 is a combined winding layer, so that even if the metal sheath 17 comes into contact, the tape is not easily bent or cut. In addition, even if the tape breaks, the laminated winding layer is not loosened, so that the tape is not clogged in the metal sheath when the metal sheath is processed. Further, since the good conductive member 13 is disposed inside the laminated winding layer, the metal sheath 17 does not break.

(Second Embodiment)
7 and 8 are a partial longitudinal sectional view and a transverse sectional view, respectively, showing a running water prevention cable of a second embodiment of the present invention.

As shown in FIGS. 7 and 8, in the present embodiment, the cross-sectional area is the same as that of the good conductive member 13 on the combined winding layer 16 of the conductive wire woven tape 14 and the water-absorbing semiconductive tape 15, for example, having a cross-sectional area of 2 mm. ^A highly conductive member 19 composed of ^two tin-plated annealed copper braided wires (0.1 mm × 256) is vertically attached or spirally wound at a predetermined pitch, and a metal sheath 17 is provided thereon. A smooth metal sheath such as a smooth lead sheath is provided. Hereinafter, the good conductive member 13 under the combined winding layer 16 of the conductive wire woven tape 14 and the water absorbent semiconductive tape 15 is used as the first good conductive member, and the combined wound layer 16 of the conductive wire woven tape 14 and the water absorbent semiconductive tape 15. The upper conductive member 19 is referred to as a second good conductive member. In the example of FIG. 8, one first good conductive member 13 is arranged on the internal water-absorbing semiconductive tape winding layer 12, and one second good conductive member 19 is arranged on the laminated winding layer 16. However, a plurality of the first good conductive members 13 and / or the second good conductive members 19 may be arranged in order to make the contact of the conductive wire weaving tape 14 with the conductive wire 14a more reliable. In this case, it is preferable that the plurality of first good conductive members 13 and / or second good conductive members 19 are arranged at substantially equal intervals in the circumferential direction.

  In the running water-preventing cable of the present embodiment, the first good conductive member 13 is disposed under the combined winding layer 16 of the conductive wire woven tape 14 and the water absorbent semiconductive tape 15, and the conductive wire woven tape 14 and the water absorbent semiconductive tape 14 are disposed. A second good conductive member 19 is disposed on the combined winding layer 16 with the conductive tape 15, and the conductive wire 14 a in the conductive wire woven tape 14 located in the gap portion P of the water-absorbing semiconductive tape 15 is connected to the second conductive material 19. The metal sheath 17 made of a smooth metal sheath can be reliably electrically connected via the good conductive member 19.

  That is, when a smooth metal sheath is used as the metal sheath 17, the thickness of the combined winding layer 16 of the gap portion P of the water-absorbing semiconductive tape 15 is thinner than the other portions. 14a may not come into contact with the metal sheath 17. In this case, not all the conductive wires 14 a of the conductive wire woven tape 14 can be electrically connected to the metal sheath 17, and a charging current stays in the conductive wire woven tape 14. In the present embodiment, since the second highly conductive member 19 is provided on the combined winding layer 16 of the conductive wire woven tape 14 and the water-absorbing semiconductive tape 15, pressing due to the weight of the cable core and the second good conductive member 19 are provided. Due to the pressing by the winding tension of the conductive member 19, the second good conductive member 19 and the conductive wire 14 a of the conductive wire weaving tape 14 facing it, including the gap portion P of the water-absorbing semiconductive tape 15, are securely in contact with each other. The conductive wire 14a of the conductive wire weaving tape 14 in the gap portion P of the water-absorbing semiconductive tape 15 and the metal sheath 17 made of a smooth metal sheath can be electrically connected via the two good conductive members 19, and the conductive wire weaving tape 14 It is possible to prevent the charging current from staying inside.

In order to obtain such an effect, it is important to bring the second good conductive member 19 into contact with the conductive wire 14 a of the conductive wire weaving tape 14 in the gap portion of the water-absorbing semiconductive tape 15. Similarly to the first good conductive member 13, the ^second good conductive member 19, for example, may have a cross-sectional area of about 0.125 mm ² or more, preferably 0.5 mm ² or more. In addition to braided wire, annealed copper wire, tinned annealed copper wire, aluminum wire, annealed copper strand, tinned annealed copper strand, aluminum strand, annealed copper braided wire, copper tape, aluminum tape and other metal tapes, and lead, aluminum, copper For example, a laminated tape of a metal tape and a plastic layer can be used. When a metal tape or a laminate tape is used as the second good conductive member 19, in order to ensure electrical conduction with the conductive wire 14a of the conductive wire weaving tape 14, a protrusion 13a as shown in FIGS. It may be provided and vertically attached on the combined winding layer 16 of the conductive wire weaving tape 14 and the water-absorbing semiconductive tape 15 so that the protrusion 13a is on the lower side, or it may be wound spirally at a predetermined pitch. FIG. 3A shows an example in which one protrusion 13a is provided along the length direction, and FIG. 3B shows an example in which a plurality of width direction protrusions 13a are provided at intervals in the length direction. FIG. 3C shows an example in which a plurality of protrusions 13a inclined at a predetermined angle with respect to the width direction are provided at intervals in the length direction. In addition, the cross-sectional shape of the protrusion 13a may be a triangle, a rectangle, a semicircle, or the like as shown in FIGS.

It is a partial longitudinal cross-sectional view which shows the running water prevention cable of 1st Embodiment. It is a cross-sectional view of the running water prevention cable shown in FIG. It is a figure explaining the example of the good electroconductive member used for this embodiment, (a)-(c) is a top view, (d)-(f) is sectional drawing. It is a top view which shows an example of the conducting wire woven tape used for this embodiment. It is a partially cutaway longitudinal cross-sectional view which shows the principal part of the running water prevention cable shown in FIG. It is a longitudinal cross-sectional view which shows the principal part of the running water prevention cable shown in FIG. It is a partial longitudinal cross-sectional view which shows the running water prevention cable of 2nd Embodiment. It is a cross-sectional view of the running water prevention cable shown in FIG. It is a longitudinal cross-sectional view which shows the conventional running water prevention cable.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Cable core, 13 ... (1st) good electroconductive member, 14 ... Conductor woven tape, 15 ... Water-absorbing semiconductive tape, 16 ... Combined winding layer of conductor woven tape and water-absorbing semiconductive tape, 17 ... Metal Sheath, 19 (second) good conductive member.

Claims (1)

A metal good conductive member is vertically attached or spirally wound around the outer periphery of the cable core, and a conductive wire weaving tape and a water absorbent semiconductive tape are wound on the cable core so that the water absorbent semiconductive tape is gap-wrapped. Ri formed by providing a corrugated metal sheath to conduct with the conductive wire woven narrowing tape above,
The absorbent gap width semiconductive tape, Hashirimizu prevent cable, wherein 5% to 70% der Rukoto the tape width of the tape narrowing woven conductive wire.

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