JP2004112978A - Interphase spacer for electric wire, and aerial transmission line - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an interphase spacer for electric wire that is effective in preventing the occurrence of a galloping phenomenon, and that is hardly breakable. <P>SOLUTION: An insulating spacer 18 is connected between two frames 10 provided with electric wire gripping brackets 12 that grip aerial transmission lines 14. A universal joint 16, which is freely rockable about two axes intersecting each other at right angles inside a plane that intersects at right angles the longitudinal direction of the insulating spacer 18, is inserted at joint portions of the frame 10 and the insulating spacer 18. The insulating spacers are formed by connecting a plurality of spacing bodies 20, having long-rod insulator portions in the longitudinal direction, so that connection brackets 22, inserted at each joint portion of the spacing bodies 20, and the brackets 22 are bent within a plane that is orthogonal to the line direction of the aerial transmission lines 14. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an interphase spacer for electric wires that connects adjacent overhead transmission lines within the same span to prevent a galloping phenomenon from occurring. The present invention also relates to an overhead transmission line in which adjacent overhead transmission lines within the same span are connected by the electric wire phase spacer.
[0002]
[Prior art]
In an overhead transmission line, it is necessary to prevent adjacent overhead transmission lines from contacting each other due to galloping vibration accompanied by twisting or the like, thereby causing a short circuit accident. Therefore, overhead transmission lines that are adjacent to each other in the same span in the vertical direction, for example, are connected by a correlation spacer for electric wires. As an example of the related art, there is one proposed in Japanese Patent No. 2635718. This prior art will be briefly described below. First, a first type electric wire interphase spacer and a second type electric wire interphase spacer, which are disposed in parallel, are interposed between two vertically adjacent overhead transmission lines. The first type interphase spacer for electric wires is configured to bend only in a plane including the line direction of the overhead transmission line, and the second type interphase spacer for electric wires is formed in a plane orthogonal to the line direction of the overhead transmission line. It is configured to bend only within. Therefore, the movement of the overhead power transmission line in the twisting direction is prevented by the first type interphase spacer for the wire, and the vertical undulation of the overhead power transmission line and the line of two adjacent overhead power transmission lines. The relative displacement in the directions is prevented by the second type of interphase spacer for electric wires. Thus, the occurrence of the galloping phenomenon of the overhead transmission line is suppressed.
[0003]
[Problems to be solved by the invention]
By the way, according to the experimental observations of the inventors, when a twisting force acts on the overhead power transmission line, as in the first type of the above-described prior art, the interphase spacer for the power transmission line is moved in the twisting direction of the overhead power transmission line. If the structure does not bend at all, a large stress repeatedly acts on this interphase spacer for electric wires, and it is easily damaged. In addition, the twisting force of the overhead transmission line causes vibrations in the interphase spacers for electric wires, so that a standing wave having a natural frequency is easily generated, and the standing wave is hardly attenuated. Further, when the overhead transmission line undulates vertically or two adjacent overhead transmission lines are relatively displaced in the line direction, as in the second type of the above-described prior art, the interphase spacer for the electric wire is used as the overhead transmission line. If the structure does not bend at all in the plane including the line direction of the transmission line, a large stress acts on the interphase spacer for the electric wire, and the spacer is easily damaged accordingly.
[0004]
In addition, the present inventors have conducted experimental observations on the electric wire interphase spacer as a structure that is flexible in itself and can be easily bent in any direction. Waves are easily generated, and abnormal vibration due to the standing waves is easily maintained. In addition, abnormal vibration of the overhead transmission line sometimes occurs due to abnormal vibration of the interphase spacer for electric wire. In addition, experimental observations were made on a structure in which the interphase spacers for electric wires could be bent in a plane including the line direction and also bendable in a plane perpendicular to the line direction, but galloping phenomena occurring in overhead transmission lines were also conducted. Cannot be sufficiently suppressed.
[0005]
Therefore, based on the knowledge obtained from the above experimental observations, the inventors made it easy to bend in a plane perpendicular to the line direction and to apply a large stress to the twisting force that is likely to occur in the overhead transmission line. In addition, to avoid undulation up and down and relative displacement in the line direction, it bends to some extent in the plane including the line direction to avoid the effect of large stress, and furthermore, in the plane perpendicular to the line direction and the line direction By making the bendability different from that in the plane including the above, it is possible to prevent the occurrence of the galloping phenomenon of the overhead power transmission line and to configure the interphase spacer for the electric wire which is hardly damaged.
[0006]
The present invention has been made to solve the problems of the prior art based on the new knowledge obtained from the experimental observations as described above, and is effective in preventing the occurrence of the galloping phenomenon, and is hardly damaged. An object is to provide an interphase spacer for electric wires. It is another object of the present invention to provide an overhead transmission line that is easy to maintain by using such an interphase spacer for electric wires.
[0007]
[Means for Solving the Problems]
In order to achieve such an object, an interphase spacer for electric wires according to the present invention includes a plurality of interspacers including at least one interspacer having a long trunk insulator between two frames provided with electric wire gripping members. A universal joint that is connected by an insulating spacer that is connected in the length direction and that is swingable about two intersecting axes in a plane that intersects the length direction is provided at a connection portion between the frame and the insulating spacer. The interconnecting portion of the spacing member is configured to bend in a plane orthogonal to the line direction of the overhead transmission line gripped by the wire gripping bracket.
[0008]
The frame body has a frame shape in a plane perpendicular to the line direction, and a coupling member long in the length direction of the insulating spacer is fixed to the frame body at two edges through a central portion. One end of the insulating spacer may be connected to one end of the coupling member via the universal joint.
[0009]
Further, the connecting portions of the plurality of spacers are connected to each other via a connecting metal, and the connecting metal is connected to the two members that respectively connect the ends of the spacers with bolts. A non-lubricating bearing for high load may be fitted to the first member so as to be swingable with respect to any one of the members.
[0010]
Further, the overhead transmission line of the present invention is an overhead transmission line in which adjacent overhead transmission lines within the same span are connected by an interphase spacer for electric wires, wherein the interphase spacer for electric wires is an electric wire holding the overhead transmission line. The two frame members provided with the gripping members are connected by an insulating spacer formed by connecting a plurality of spacer members including at least one spacer member having a long trunk insulator portion in a longitudinal direction, and the frame member and the frame member are connected to each other. A connecting part of the insulating spacer is provided with a universal joint swingable about two intersecting axes in a plane intersecting with the length direction, and a connecting part of the spacing member is connected to a line direction of the overhead transmission line. Is configured to bend in a plane orthogonal to
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a front view of a first embodiment of an interphase spacer for electric wires provided in an overhead transmission line according to the present invention. FIG. 2 is a front view of the frame provided with the wire gripping fitting. FIG. 3 is a sectional view taken along the line AA of FIG. 4A and 4B show the structure of the universal joint, wherein FIG. 4A is a partially cutaway front view, and FIG. 4B is a sectional view taken along the line BB of FIG. FIGS. 5A and 5B show a connection metal fitting, in which FIG. 5A is a front view, and FIG. 5B is a cross-sectional view of FIG.
[0012]
In FIG. 1, overhead transmission lines 14, 14... Vertically adjacent to each other within the same span of the overhead transmission line are respectively gripped by electric wire gripping fittings 12, 12,. The insulating spacer 18 is connected between the frames 10, 10, and the distance between the frames 10, 10 is defined to a predetermined length. Universal joints 16 and 16 are interposed at the connection portions between the frames 10 and the insulating spacers 18, respectively. Furthermore, the insulating spacer 18 is formed by connecting three spacers 20, 20, 20 having a long trunk insulator portion to the mutually connected portions thereof in the longitudinal direction via connecting metal fittings 22, 22.
[0013]
As shown in FIG. 2, the frames 10, 10 have a rectangular frame shape in a plane orthogonal to the line direction of the overhead transmission lines 14, 14. Are arranged as appropriate. Further, as shown in FIG. 3, a coupling member 24 that is long in the length direction of the insulating spacer 18 passes through the center of the frame shape of the frame body 10 and is welded at two places of an upper edge 10a and a lower edge 10b. Fixed.
[0014]
The universal joint 16 is fixed to one end of the coupling member 24 as shown in FIG. The universal joint 16 has a structure having two orthogonal axes in a plane orthogonal to the length direction of the insulating spacer 18 as a swing axis. Therefore, the insulating spacer 18 cannot be rotated around the axis about the longitudinal direction with respect to the frame body 10, but can be swung in any direction by two orthogonal axes. In addition, high-load non-lubricating bearings (oil-less bearings) 26, 26, 26 in which a solid lubricant is embedded based on a high-tensile brass-based alloy are fitted to the bolts serving as the rocking shafts. 28, 28, 28 are spacers for filling gaps between bolts and other members.
[0015]
Further, as shown in FIG. 5, connecting metal fittings 22, 22 for connecting mutually connecting portions of the three spacers 20, 20, 20 each having the long trunk insulator portion are provided at the ends of the spacers 20, 20, as shown in FIG. Two metal fittings 22a and 22b whose parts are fixed by bolts are configured to be swingable about the bolts by bolts 22c. Moreover, the spacer 28 and the high-load oilless bearing 26 are fitted to the bolt 22c.
[0016]
In such a configuration, the insulating spacer 18 swings with respect to the frames 10, 10 by the universal joints 16, both in a plane including the line direction of the overhead transmission lines 14, 14, and in a plane orthogonal to the line direction. it can. Moreover, the insulating spacer 18 can be bent in a plane orthogonal to the line direction by the connecting metal fittings 22 connecting the spacing members 20.
[0017]
Then, in response to the twisting of the overhead transmission lines 14, 14,... Around the line direction due to the galloping phenomenon, the universal joints 16, 16 and the connecting fittings 22, 22 separate the three overhead bodies 20, 20, 20 from each other. The insulating spacer 18 is easily bent in a plane perpendicular to the line direction, and is not damaged without excessive stress. Moreover, the movement of extending the distance between the adjacent overhead transmission lines 14 within the same span is restricted by the insulating spacer 18, and the overhead transmission lines 14, 14 ... are freely galloped by this regulation. It cannot twist and oscillate, and galloping phenomena are quickly suppressed and attenuated. In addition, the insulating spacer 18 itself does not abruptly attenuate vibrations and the like due to the bending of the connection fittings 22, 22, and does not generate a standing wave of a natural frequency and continue to vibrate. On the other hand, when undulations occur in the overhead transmission lines 14, 14,... In a vertical plane including the line direction of the overhead transmission lines 14, 14,. Can be swung, and is not damaged without excessive stress. Also, even if adjacent connected overhead transmission lines 14, 14... Are relatively displaced in the line direction, they can be similarly swung by the universal joints 16, 16 and the insulating spacer 18 is not damaged.
[0018]
According to the experiments by the inventors, the connecting fittings 22, 22 for connecting the interconnecting portions of the spacing members 20, 20, 20 are different from those in the first embodiment, and are different in a plane including the line direction. It has been obtained that when the bend is made, the galloping phenomenon of the overhead transmission lines 14, 14,... Cannot be sufficiently suppressed.
[0019]
By the way, a relatively large force acts on the structure connecting the insulating spacer 18 and the frames 10, 10. Therefore, the coupling member 24 having one end to which the universal joint 16 is connected is fixed to two portions of the upper edge 10a and the lower edge 10b of the frame 10 so that the coupling member 24 is fixed to the lower edge 10b of the frame 10. An extremely robust structure can be obtained as compared with the conventional one fixed at one place. In addition, the swing portion of the universal joint 16 and the connection fitting 22 is also often swung in a state where a large tension or the like is applied. Wear of bolts and the like can be reduced, and the useful life can be prolonged accordingly.
[0020]
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a front view of a second embodiment of the interphase spacer for electric wires provided in the overhead transmission line according to the present invention. 6, the same or equivalent members as those shown in FIGS. 1 to 5 are denoted by the same reference numerals, and redundant description will be omitted.
[0021]
The second embodiment shown in FIG. 6 is different from the first embodiment shown in FIG. 1 in that an insulating spacer 18 is provided with two spacers 20 and 20 having long trunk insulator portions, and a long trunk insulator portion. This is because one spacer 30 having no gap is connected in the length direction. This indicates that the structure of the insulating spacer 18 may be appropriately set in accordance with the distance between the overhead transmission lines 14, 14... Adjacent in the vertical direction and the insulation withstand voltage required therebetween. Things. Here, it is desirable to reduce the weight of the insulating spacer 18 as much as possible so as not to apply an excessive load to the overhead transmission lines 14. Therefore, if a sufficient withstand voltage can be obtained, a part of the spacers 20, 20, 20 is replaced with a spacer 30 having no heavy long trunk insulator portion to achieve further weight reduction and The distance between the overhead transmission lines 14, 14,.
[0022]
In the above embodiment, the insulating spacer 18 may be formed by connecting a plurality of spacers 20, 20, and 30 including the spacer 20 having at least one long stem portion. It is needless to say that the present invention is not limited to the embodiment. In addition, the insulating spacers 18 need only be able to swing in other directions without rotating around the axis about the length direction with respect to the frames 10, 10. The universal joints 16 and 16 need not have a line direction in a plane orthogonal to the length direction of the insulating spacer 18 and two axes orthogonal to the line direction. That is, the universal joints 16 may be freely swingable around two intersecting axes in a plane intersecting the length direction of the insulating spacer 18. Further, the spacers 20, 30,... Are not limited to those connected via the connecting fittings 22, 22, and the ends of the spacers 20, 30,. May be configured. Further, the frame bodies 10 and 10 may have a frame shape in a plane orthogonal to the line direction, and may be circular without being limited to a rectangle.
[0023]
【The invention's effect】
As described above, since the interphase spacer for electric wire and the overhead transmission line of the present invention are configured, the following special effects can be obtained.
[0024]
In the interphase spacer for an electric wire according to the first aspect, the insulating spacer is swingable by a universal joint in a plane including the line direction and in a plane orthogonal to the line direction with respect to the frame provided with the electric wire gripping bracket. In addition, because the insulating spacer formed by connecting a plurality of spacers is bent in a plane perpendicular to the line direction at the connection part, the vertical direction including the galloping phenomenon of the overhead transmission line and the line direction Excessive stress does not act on the insulating spacer against undulation in the plane or relative displacement in the line direction, and the insulating spacer is not damaged. Moreover, the galloping phenomenon is suppressed and attenuated, and the insulating spacer itself does not continue to vibrate at its natural frequency.
[0025]
In the interphase spacer for electric wires according to the second aspect, the connecting member is fixed to the frame at two edges through the center of the frame, and an insulating spacer is connected to one end of the connecting member via a universal joint. Therefore, a more robust structure can be obtained as compared with the conventional structure in which one end of the insulating spacer is connected to one edge of the frame.
[0026]
In the interphase spacer for electric wires according to the third aspect, since a high-load oil-free bearing is provided at the swinging portion of the connection fitting, abrasion occurs even if the swinging is performed in a state where a large tension is applied. It is difficult, and the durable life can be lengthened accordingly.
[0027]
In the overhead power transmission line according to claim 4, the insulating spacer is hardly damaged, and the occurrence of galloping phenomenon is sufficiently suppressed. It is easy to maintain and manage.
[Brief description of the drawings]
FIG. 1 is a front view of a first embodiment of an interphase spacer for electric wires provided in an overhead transmission line according to the present invention.
FIG. 2 is a front view of a frame provided with an electric wire holding bracket.
FIG. 3 is a sectional view taken along the line AA of FIG. 2;
4A and 4B show the structure of the universal joint, wherein FIG. 4A is a partially cutaway front view, and FIG. 4B is a cross-sectional view of FIG.
5 (a) is a front view, and FIG. 5 (b) is a sectional view taken along the line CC in FIG. 5 (a).
FIG. 6 is a front view of a second embodiment of the interphase spacer for electric wires provided in the overhead transmission line of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Frame body 12 Electric wire holding metal fittings 14 Overhead power transmission line 16 Universal joint 18 Insulating spacers 20, 30 Spacing element 22 Connecting metal fittings 22c Bolt 24 Coupling member 26 Oil-free bearing for high load

Claims (4)

The two frame bodies provided with the wire gripping metal are connected by an insulating spacer formed by connecting a plurality of spacing bodies including at least one spacing body having a long trunk insulator portion in a longitudinal direction, and the frame body is provided. And a connecting part of the insulating spacer and a universal joint swingable about two intersecting axes in a plane intersecting with the length direction are interposed, and the connecting part of the spacer is held by the electric wire holding bracket. An interphase spacer for an electric wire, characterized in that it is configured to bend in a plane orthogonal to the line direction of the overhead transmission line. 2. The interphase spacer for electric wires according to claim 1, wherein the frame has a frame shape in a plane perpendicular to the line direction, and a coupling member long in a length direction of the insulating spacer is provided at a central portion of the frame body. Characterized in that it is fixed at two edges through the connecting member and one end of the insulating spacer is connected to one end of the coupling member via the universal joint. The interphase spacer for electric wires according to claim 1, wherein mutually connected portions of the plurality of spacers are connected via a connection fitting, and the connection fittings are connected to two ends of the spacers respectively connected thereto. An interphase spacer for electric wires, wherein a metal fitting is connected by a bolt, and a high-load non-lubricating bearing is fitted to the bolt so as to be swingable with one of the members. An overhead transmission line in which adjacent overhead transmission lines within the same span are connected by an interphase spacer for electric wires, wherein the interphase spacer for electric wires is formed by two frame members provided with an electric wire gripping fixture for gripping the overhead transmission line. The spaces are connected by an insulating spacer formed by connecting a plurality of spacers including at least one spacer having a long trunk insulator portion in a longitudinal direction, and the length is connected to a connecting portion between the frame and the insulating spacer. A universal joint swingable about two intersecting axes in a plane intersecting the direction is interposed, and the interconnecting portion of the spacing member is bent in a plane orthogonal to the line direction of the overhead transmission line. An overhead power transmission line characterized by comprising:

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