JP2011192492A - Insulating support member of overhead wire and building for electric equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insulating support member of an overhead wire, capable of achieving a prescribed drawing in from the overhead wire, by easily closing the opening of a building at low cost. <P>SOLUTION: The insulating support member is provided with a substrate 12 consisting of a disk-shape insulating member, surface parts 13, 14 consisting of an insulating member which have a protrusion arranged concentrically and are arranged respectively on both sides of the substrate 12, and a connection 15 which is arranged on the substrate 12 penetrating the central part of the substrate 12 and connects the overhead wire and a drawing lead wire into the building. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an insulation support member for an overhead wire and a building for an electric facility, and is particularly useful when applied to an electrical device in a building by drawing an overhead power transmission line through an opening.

  When connecting overhead power transmission lines and underground power transmission lines (mainly submarine cables), there is a dedicated transmission line building (cable house) that connects both of them in the transmission line building. . FIG. 4 is an explanatory diagram conceptually showing an example of this type of transmission line building according to the prior art.

  As shown in the figure, the overhead power transmission line 1 is connected to the submarine cable 4 in the cable terminal box 3 through the lead-in line 2. Here, the cable termination box 3 is placed on the gantry 5 and disposed in the building 6 in order to protect it. That is, the submarine cable 4 is raised and its cable head faces the cable terminal box 3. Here, the insulators 8 and 9 are fixed to the outer wall of the building 6 obliquely upward and to the lower frame of the opening 7 upward, and the lead-in wire 2 is at the upper ends of the insulators 8 and 9. While being supported, the cable terminal box 3 is drawn into the cable terminal box 3 through the insulator 10 disposed on the cable terminal box 3. Here, only one phase is shown in FIG. 4, but the remaining two phases having the same configuration are also arranged in a direction perpendicular to the paper surface of FIG.

  Note that Patent Document 1 and Patent Document 2 exist as prior arts that disclose the structure of a connecting portion that connects an overhead power transmission line and an underground power transmission line.

Japanese Patent Application Laid-Open No. 11-196753 JP 2005-269961 A

  In the prior art as described above, the overhead power transmission line 1 is drawn into the building 6 through the opening 7. Since a high voltage (for example, 110 kV) is applied to the overhead power transmission line 1, it is necessary to ensure a sufficient insulation distance from the building 6 even when the lead-in line 2 passes through the opening 7. For this reason, the opening 7 needs a wide opening area to some extent. In addition, since the adjacent insulators 9 are disposed so as to be spaced apart in the horizontal direction of the opening 7 so that a predetermined insulation distance can be maintained between the phases, a large space is formed in the opening 7 between the adjacent insulators 9. Can be done. As a result, birds such as pigeons enter the building 6 through the opening 7, and the damage caused by the feces is a problem. That is, the insulator 10, the cable terminal box 3, the mount 5, and the like are soiled by bird droppings, causing deterioration due to corrosion of metal parts, etc., as well as sanitary conditions in the building 6 and the generation of malodors. It becomes a problem. For this reason, a great deal of cost and labor are required for cleaning. Incidentally, since it is necessary to perform the cleaning while temporarily stopping power transmission, the trouble associated with this is complicated, and additional costs are incurred.

  On the other hand, if the opening 7 is sealed, it is possible to prevent the birds from entering the building 6. However, in this case, it is necessary to provide a penetrating bushing that penetrates the wall surface of the building 6, secure sufficient insulation with the penetrating bushing, and introduce the lead-in wire 2 into the building 6. Since many of these through bushings use porcelain porcelain pipes and use insulating oil for internal insulation, they are heavy, long and expensive. Therefore, in order to support and fix this type of penetration bushing, which is subjected to a large external force, such as shaking due to wind and snow, at the penetration portion of the building 6, the strength of the building 6 needs to be sufficiently large. Therefore, in combination with this point, there is a problem in terms of cost for sealing the building 6 using this type of through bushing.

  In view of the above prior art, the present invention provides an insulation support member for an overhead wire and an electrical equipment building that can easily seal the opening of the building at a low cost and realize predetermined pull-in from the overhead wire. Objective.

The first aspect of the present invention for achieving the above object is as follows:
A substrate made of a disk-shaped insulating member, a creeping surface made of an insulating member having convex portions arranged concentrically and respectively disposed on both surfaces of the substrate, and a central portion of the substrate. And a connecting portion for connecting the overhead wire and the indoor lead-in wire to the board.

  According to this aspect, since the connection part which is a charging part exists in the center of a disk-shaped insulating member, a uniform insulation distance can be ensured from the charging part to the ground via the insulator, and the creeping part Since it has the convex part arrange | positioned concentrically, sufficient creeping distance can be ensured. As a result, the insulating support member substantially functions as a flat insulator, and good insulation of the charging unit can be ensured by the member on the flat plate. Therefore, it is possible to reduce the bending load and the equipment weight on the insulating support member.

The second aspect of the present invention is:
In the insulation support member for overhead wires described in the first aspect, the insulation support member for overhead wires is characterized in that the cross-sectional shape of the creeping portion in the radial direction is a triangular shape continuous in the radial direction. is there.

  According to this aspect, a necessary creepage distance can be easily ensured.

The third aspect of the present invention is:
In the insulation support member for overhead wires described in the first or second aspect, the insulation support member for overhead wires is characterized in that the substrate is formed of porcelain and the creeping portion is formed of resin.

  According to this aspect, the mechanical strength as the insulating support member is ensured by the porcelain portion, and the necessary creepage distance is ensured by the lightweight resin member. Light weight can be realized.

The fourth aspect of the present invention is:
An electrical equipment building having an opening for drawing an electric wire from an overhead wire to an electrical device housed therein, one side facing the exterior of the electrical equipment building and the other side for the electrical equipment The insulating support member according to any one of the first to third aspects disposed in the opening facing the inside of the building, and a lid member that seals the opening. Located in the building for electrical equipment.

  According to this aspect, since the opening of the building is reliably closed by the insulating support member and the lid member, it is possible to achieve a good sealing of the building interior, preventing intrusion of birds and the like into the building interior. Harm caused by can be completely removed. On the other hand, since the insulating support member is light and flat, the action of external force such as bending moment can be reduced as much as possible, and the structural burden on the building supporting the insulating support member can be reduced accordingly. The required sealed structure can be realized at a low cost.

According to a fifth aspect of the present invention,
In the electrical equipment building described in the third aspect, the electrical equipment is a cable terminal box that constitutes a connection portion between the overhead power transmission line and the submarine cable as the overhead wire. is there.

  According to this aspect, the cable terminal box can be appropriately protected in a favorable environment.

  According to the present invention, a sufficient creepage distance can be ensured, and uniform and good ground insulation can be easily ensured. Therefore, the opening of the building can be properly sealed, and the bird can be accurately and inexpensively manufactured. It is possible to prevent fecal damage due to intrusion of the like.

It is a figure which shows the insulation support member which concerns on embodiment of this invention, (a) is the top view, (b) is the sectional view on the AA 'line. It is explanatory drawing which shows notionally the building for power transmission lines in the state which sealed the opening part with the cover member integrated with the insulation support member shown in FIG. FIGS. 3A and 3B are diagrams illustrating the opening of FIG. 2 extracted from the inside of the building, and FIG. 3B is a cross-sectional view taken along line BB ′ in FIG. It is explanatory drawing which shows notionally the building for power transmission lines which concerns on a prior art.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1A and 1B are diagrams showing an insulating support member according to an embodiment of the present invention, in which FIG. 1A is a plan view and FIG. 1B is a cross-sectional view taken along line AA ′. As shown in both drawings, the insulating support member 11 includes a substrate 12 made of a disk-shaped insulating member, and insulating members disposed on both surfaces of the substrate 12 having convex portions arranged concentrically. Creeping surface portions 13 and 14, an overhead power transmission line (not shown in FIG. 1) and an indoor lead-in line (not shown in FIG. 1) disposed on the substrate 12 through the center of the substrate 12. And a connection portion 15 made of a conductive member for connecting the two. Here, since the board | substrate 12 becomes a fixing | fixed part with respect to other structures (for example, beam of a building, etc.), predetermined intensity | strength is required. Accordingly, a porcelain is preferable in consideration of the point that it is required to be a hard insulating member having a certain strength. A mounting member 17 having a hole 16 through which a bolt (not shown) as a fastening member can be inserted is integrally fixed to the opposing positions of the peripheral edge of the substrate 12.

  The creeping portions 13 and 14 have annular convex portions arranged concentrically as described above in order to increase the creepage distance, and the convex portions have a cross-sectional shape extending in the radial direction of the substrate 12 as described above. By forming a triangular shape continuous in the direction, it can be formed easily and accurately. However, it is of course not limited to such a triangular shape. There is no special limitation as long as a predetermined creepage distance from the charging unit is ensured. However, since it is preferable to make the diameter of the substrate 12 of the insulating support member 11 as small as possible, it is necessary to examine the shape from this viewpoint. Further, from the viewpoint of reducing the weight of the insulating support member 11, it is important that the creeping portions 13 and 14 are made as light as possible. For this reason, in this embodiment, the creeping surfaces 13 and 14 are formed of a resin, more specifically, an epoxy resin from the viewpoint of having a good insulating performance and being lightweight. The creeping surfaces 13 and 14 of this embodiment are fixed to both surfaces of the substrate 12 with an adhesive or the like.

  In this embodiment, the substrate 12 and the creeping portions 13 and 14 are formed as separate members as described above. However, the mechanical strength required for the substrate 12 and the weight reduction required for the creeping portions 13 and 14 are simultaneously achieved. If there is a material that can be used, both can be molded integrally.

  In the insulating support member 11, the connecting portion 15 that is a charging portion is located at the center of the disc-shaped insulating member, so that an equal insulating distance can be secured from the charging portion to the ground via an insulator. Further, since the creeping portion 13 has the convex portions arranged concentrically, a sufficient creeping distance can be easily ensured. By the way, the necessary creepage distance is a parameter determined by the voltage class applied to the electric wires supported by the connection portion 15, and when it is necessary to reduce the diameter of the substrate 12, the height of the convex portion is increased. When the distance can be increased and the diameter of the substrate 12 can be increased, the necessary creepage distance can be secured even if the height of the convex portion is reduced.

  FIG. 2 is an explanatory diagram conceptually showing a power transmission line building according to another embodiment of the present invention in which an opening is sealed with a lid member integrated with the insulating support member shown in FIG. 2 that are the same as those in the prior art shown in FIG. 4 are assigned the same reference numerals, and redundant descriptions are omitted.

  As shown in FIG. 2, in this embodiment, the lead-in wire 2 connected to the overhead power transmission line 1 is drawn into the building 6 through the connection portion 15 of the insulating support member 11, and the cable termination box 3 as in the conventional case. It is connected to the submarine cable 4 inside. On the other hand, the opening 7 is completely sealed with a lid member 19 through which the insulating support member 11 passes. Details of such a sealing structure will be described with reference to FIG.

  FIGS. 3A and 3B are diagrams showing the opening of FIG. 2 extracted, where FIG. 3A is a view seen from the inside of the building, and FIG. 3B is a cross-sectional view taken along the line BB ′ of FIG. As clearly shown in both figures, since the normal power transmission system has three phases, the insulating support member 11 is also provided corresponding to each phase. That is, the three insulating support members 11 have one surface (the creeping portion 13 side) facing the outside of the building 6 and the other surface (the creeping portion 14 side) facing the inside of the building 6. Are arranged side by side in the horizontal direction. Here, each insulating support member 11 is fixed to a columnar member 20 formed by a structural member of a building or an L-shaped angle or the like standing on the ground later by a fastening member 21 such as a bolt via an attachment member 17.

  According to this embodiment, since the building 6 is completely sealed, it is possible to completely prevent a bird or the like from entering the building 6 through the opening 7. On the other hand, the insulating support member 11 can be remarkably reduced in weight as compared with the conventional through bushing, so that the mechanical strength of the columnar member 20 on the building 6 side required for the mounting is reduced, and the insulating support member Since 11 can be substantially regarded as a member on a flat plate as compared with the through bushing, its influence can be reduced as much as possible to an external force caused by wind and snow.

  In the sealed structure of this embodiment, the columnar member 20 is erected in the case where there is an existing columnar member 20 to which the insulating support member 11 can be attached, and in the building 6 when there is no existing columnar member 20. In this case, first, the insulating support member 11 is lifted up to the position of the opening 7 and fixed to the columnar member 20, and in this state, the lead-in wire 2 is connected via the connecting portion 15, Thereafter, the opening 7 may be sealed with the lid member 19.

  In addition, although this form demonstrated as the case where the opening part 7 of the existing building 6 was sealed using the insulation support member 11, it needs to be limited to the case where the insulation support member 11 is used in combination with the cover member 19 integrally. There is no. Of course, it is also possible to apply from the beginning of the construction of the building 6. In this case, the insulating support member 11 may be disposed through the wall surface of the building 6.

  Moreover, although the said embodiment demonstrated regarding the sealing structure of the building for power transmission lines, it is not restricted to this. When an overhead wire is drawn in from the outside via a lead-in wire and connected to an electrical device in the building, it can be generally applied and the same effect can be expected.

  The present invention can be used in industrial fields such as the electric power industry that owns transmission lines and the electric equipment industry that manufactures and sells the equipment.

DESCRIPTION OF SYMBOLS 1 Overhead power transmission line 2 Lead-in line 3 Cable termination box 4 Submarine cable 6 Building 7 Opening part 11 Insulation support member 12 Board | substrates 13 and 14 Creeping part 15 Connection part 19 Cover member

Claims (5)

A substrate made of a disk-shaped insulating member;
A creeping surface made of insulating members having convex portions arranged concentrically and arranged on both surfaces of the substrate, and
An insulation support member for an overhead wire, comprising: a connection portion that passes through a central portion of the substrate and is disposed on the substrate and connects the overhead wire and an indoor lead-in wire. In the insulation support member of the overhead wire according to claim 1,
An insulation support member for an overhead wire, wherein a cross-sectional shape of the creeping portion in the radial direction is a triangular shape continuous in the radial direction. In the insulation support member of the overhead wire according to claim 1 or claim 2,
An insulating support member for an overhead wire, wherein the substrate is formed of porcelain and the creeping portion is formed of resin. A building for an electrical facility having an opening for drawing an electric wire from an overhead wire to an electrical device housed therein,
4. The device according to claim 1, wherein one surface faces the outside of the electrical equipment building and the other surface faces the inside of the electrical equipment building and is disposed in the opening. 5. An electrical equipment building comprising: an insulation support member for an overhead wire to be closed; and a lid member for sealing the opening. In the building for electrical equipment according to claim 3,
The electrical equipment building is characterized in that the electrical device is a cable terminal box that constitutes a connection portion between an overhead power transmission line, which is the overhead wire, and a submarine cable.

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