JPH089544A - Spacer, conductor loosely grasping part spacer and aerial transmission line prevented from galloping vibration - Google Patents

Abstract

PURPOSE:To provide a spacer whereby the generation of galloping vibrations is prevented and development of cylindrical ice or snow accretion having a circular section is suppressed. CONSTITUTION:Eelementary conductors 16, 16 are grasped fixedly at an even number of positions of which are situated axially symmetric with respect to the frames 12 by conductor grasping parts 14, 14 provided on one side of the symmetry axis of the frames 12, and other elementary conductors 16, 16 are so grasped by conductor loosely grasping parts 20, 20 provided on the other side of the symmetry axis as to be freely rockable within a predetermined angular range. In each conductor loosely grasping part 20, a loosely clamping main body 22 having a double structure comprising an inner tubular member 26 for grasping the elementary conductor 16 and an outer tubular member 30 which is openable around a pivot axis parallel with the elementary conductor 16 and wherein the inner tubular member 26 is fixed. Further, in this loosely clamping main body 22, a gap part 32 and a slit which reaches the gap 32 and can move around the pivot axis are provided respectively. moreover, in a coupling member 24, a T-shaped protrusion 24a whose head part is inserted into the gap part 32 and whose neck part is passed through the slit is so provided that it can pivot. Thereby, the loosely clamping main body 22 is so mounted on the coupling part 24 that it can pivot.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spacer for preventing galloping vibration, a loose conductor gripping portion for the spacer which is used for this spacer and can prevent the growth of icing snow, and an imaginary space for preventing galloping vibration. It concerns transmission lines.

[0002]

2. Description of the Related Art Galloping vibration is one of the vibration phenomena occurring in overhead power transmission lines. This vibration has a large amplitude and may seriously impair the transmission line electrically and mechanically, and various countermeasures have been conventionally studied. The mechanism of the galloping vibration is that, when ice and snow blows on the power transmission line, wing-shaped icy snow forms on the windward side, and due to the cross-sectional shape of the frosted snow and the power transmission line, the power transmission line floats up against the wind. It is explained that it is because

As a conventional measure for preventing such galloping vibration, as shown in Japanese Utility Model Laid-Open No. 50-68892, a plurality of spacers are provided on an overhead power transmission line composed of a plurality of erected transmission lines. The power transmission line is rotatably held around the axis by at least one part of the rotary conductive gripping portions provided on the spacer, and the power transmission line is fixedly gripped by the other conductive gripping portion. Moreover, in providing a plurality of spacers in one diameter of the overhead power transmission line, the rotating conductive gripping part that rotatably grips the power transmission line and the conductive gripping part that fixedly grips the power transmission line are alternately arranged in the longitudinal direction of the power transmission line. Or they can be attached randomly.

In such a structure, the fixedly gripped power transmission line is prevented from twisting, and icing snow is generated only on the windward side, whereas the rotatably gripped power transmission line is twisted freely, so that it is almost free. The ice accretion with a circular cross section is greatly developed, and the weights of the ice accretion on both sides are greatly different, and the difference in the weight causes a twist to rotate the entire overhead power transmission line at the place where the spacer is provided. The movement cycle of each transmission line is different due to this weight difference, and galloping vibration that vertically vibrates as a whole of the overhead transmission line is suppressed.

[0005]

In the prior art as described above, icing snow having a circular cylindrical section is generated on the rotatably gripped power transmission line, which easily grows greatly.
In the case of one having a long diameter, there is a possibility that the weight due to the snow accretion having a circular cylindrical shape in cross section becomes excessive and a break occurs. Further, in the conventional one, the rotating conductive gripping portion that rotatably grips the power transmission line and the conductive gripping portion that securely grips the power transmission line are attached alternately or randomly in the longitudinal direction of the power transmission line. Although the weight of snow accretion with a circular cylindrical shape is distributed over multiple transmission lines, the difference in the motion cycle caused by the floating of the wind between the transmission lines is small, and the rotation motion cycle of multiple transmission lines is reduced over the entire span. Are easily synchronized, and the galloping vibration is not sufficiently suppressed.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a spacer and a loose conductor gripping portion for the spacer, in which a frosted snow having a circular cylindrical cross section does not occur on a power transmission line. (EN) Provided is an overhead power transmission line in which galloping vibrations capable of damping vibrations in the entire span are prevented by largely differentiating the rotational motion cycle of one half of one of the plurality of power transmission lines and the rotational motion cycle of the other half of the other. With the goal.

[0007]

In order to achieve the above object, the spacer of the present invention has a conductor grip provided on one side of one of the axes of symmetry at an even number of axially symmetrical positions of the frame body. The part holds the element conductor fixedly, and the loose conductor holding part provided on the other side holds the element conductor by the loose clamp body, and the loose clamp body is preliminarily arranged around the axis of the grasped element conductor. It is configured to be swingably connected to the frame body within a set angle range.

Further, the loose conductor gripping portion for the spacer of the present invention is divided into two parts which can be opened and closed by a swing shaft parallel to the element conductor and which is closed to hold the loose clamp body for gripping the element conductor. The connection member is swingably arranged around an axis of the element conductor within a preset angle range, and the connection member is connected to the frame body of the spacer.

Further, the loose clamp main body is divided into two parts so as to hold the element conductor from both sides, and the inner pipe member is fixed and divided into two parts which can be opened and closed by the swing shaft. With a double pipe structure with the outer pipe member formed, a gap portion is formed in at least a part between the inner pipe member and the outer pipe member, and a slit reaching the gap portion is formed in the outer pipe member. A T-shaped projection is formed around the axis, and a head portion is inserted into the gap portion and the neck portion is penetrated through the slit in the coupling member. The T-shaped projection is provided around the gap portion and the slit around the axis. The loose clamp body may be swingably arranged around the axis of the gripped element conductor in the connecting member.

Further, in the aerial power transmission line according to the present invention in which galloping vibration is prevented, a spacer is provided on the aerial power transmission line composed of an even number of power transmission lines installed, and when viewed in the line direction, the spacer frame is left or The conductor gripping part provided on the right half of the side holds and grips the power transmission line on one side half, and the loose conductor gripping part on the other half of the side grips the power transmission line of the other half on the loose clamp body. The loose clamp main body is disposed on a connecting member so as to be swingable within a preset angle range around the axis of the gripped power transmission line, and the connecting member is connected to the frame body, and the loose power transmission line The torsional rigidity of one half of the power transmission line is different from that of the other half of the power transmission line.

Further, a plurality of spacers are provided in one diameter of an overhead power transmission line composed of an even number of power transmission lines installed, and when viewed in the line direction, the frame bodies of these spacers are the same on the left or right. One side half of one side fixedly holds the transmission line of one side half, and all loose side grips provided on the other side half of the conductor loosens the transmission line of the other side half Gripping with the clamp body for use, the loose clamp body is swingably arranged around the axis of the element conductor within a preset angle range on the connecting member, and the connecting member is connected to the frame body, The torsional rigidity of one half of the power transmission line may be different from that of the other half of the power transmission line as viewed in the line direction across one span of the overhead power transmission line.

[0012]

[Operation] In the spacer of the present invention, the loose conductor gripping portion provided on one half of one side of the frame body of the spacer grips the element conductor swingably within a preset angle range. The element conductors cannot rotate freely, and ice accretion with a circular cylindrical section does not occur. Therefore, an excessive load due to icing and snow is not applied to the element conductor. Moreover, since the element conductor on the other half of the spacer is fixedly held and the element conductor on the other half of the spacer is swingably held, the torsional rigidity of the two element conductors is greatly different.

Further, in the loose conductor gripping portion for the spacer of the present invention, since the loose clamp main body for gripping the element conductor is swingably arranged on the connecting member, the position where the element conductor is gripped is set. Thus, it can swing about the axis without being displaced in the axial direction.

Further, in the loose conductor gripping portion for the spacer according to the present invention, the outer conductor member is divided into two parts which can be opened and closed by the swing shaft parallel to the element conductor and is closed across the element conductor. The element body can be gripped by the loose clamp body. Moreover, the element conductor can be gripped while the T-shaped projection of the connecting member is inserted in the gap formed between the outer pipe member and the inner pipe member.

Further, in the overhead power transmission line according to the present invention in which galloping vibration is prevented, the power transmission line in one half of one of the even number of power transmission lines is fixedly gripped, and the power transmission line in the other half of the power transmission line is swingable. Since it is gripped, the power transmission line on one half of one side has large torsional rigidity, and the power transmission line on the other half of one side has small torsional rigidity. Therefore, the two groups of power transmission lines having different torsional rigidity do not synchronize their rotational motion cycles with each other, and the vibration of the entire overhead power transmission line is suppressed. Moreover, icing snow having a circular cylindrical shape does not occur on the power transmission line that is swingably held, and an excessive load due to the icing snow is not applied to the power transmission line.

Further, in the aerial power transmission line which prevents galloping vibration according to a fifth aspect of the present invention, a plurality of spacers provided in one span fixedly holds all the power transmission lines in one half of one side. Since all the power transmission lines on the other half of the other side are swingably held, the vibration of the entire span is suppressed by the two groups of transmission lines having different torsional rigidity in the span.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be described with reference to. FIG. 1 is a front view in which a part of an embodiment of the spacer of the present invention is cut away, and FIG.
2 is a view on arrow A in FIG. 1, FIG. 2 (b) is a view on arrow B in FIG. 1, and FIG. 3 is an enlarged view on arrow C-C in FIG.
4 is an exploded perspective view of a loose conductor gripping portion for a spacer used in FIG. 1, FIG. 5 is a perspective view of an assembled appearance of FIG. 4, and FIG. 6 is a perspective view of an outer tube member shown in FIG. FIG. 7 is an external perspective view of the constituent parts of the part viewed from different directions.
(A) is a vertical cross-sectional view of a loose conductor gripping portion for a spacer showing a state in which an element conductor is swung 90 ° counterclockwise,
FIG. 7B is a vertical cross-sectional view of a loose conductor gripping portion for a spacer showing a state in which an element conductor swings 90 ° clockwise, and FIG. 8 shows a plurality of spacers in one diameter of an overhead power transmission line. 9 is a simplified perspective view in which FIG. 9 is provided, and FIG. 9 is a simplified diagram illustrating a vertical motion locus and a rotation of a power transmission line due to galloping vibration of an overhead power transmission line.

First, the structure of the spacer of the present invention will be described. As shown in FIG. 1, the spacer 10 includes a frame 12,
By 12 ..., the gripping portions are provided at axially symmetrical positions on the left and right. Then, in FIG. 1, the conductor gripping portions 14, 14 provided on the right side half with respect to the vertical symmetry axis are
16 is a fixed gripper, and is, for example, Japanese Utility Model Publication No. 57-574.
It is a known one shown in Japanese Patent Laid-Open No. 62-62. In FIG. 1, the element conductors 16 and 16 are connected to the armor rods 18 and 18, respectively.
It is wound with ... and gripped from above.

The loose conductor gripping portions 20, 20 provided on the left half of FIG. 1 have a novel structure as will be described later, and the element conductors 16, 16 are swingable around the axis.
In the loose conductor gripping portions 20, 20, a loose clamp main body 22 for gripping and fixing the raw conductor 16 is arranged at one end of a connecting member 24 so as to be swingable around the axis of the raw conductor 16 within a range of 180 °. The other end of the connecting member 24 is connected to the frame bodies 12, 12, ... Of the spacer 10. The spacer 10 is formed so that the weight is balanced on the left and right.

Next, the structure of the loose conductor gripping portion 20 for the spacer of the present invention will be described. An inner pipe member 26 is formed which is composed of a pair of members 26a, 26a in which a tubular body is substantially divided into two in a plane including an axis so that the element conductor 16 can be grasped from both sides. Flange-shaped protrusions 26b, 26b ... Are provided at both ends of the inner pipe member 26 so as to project in a direction orthogonal to the split surface, and one edge of the two split members facing each other engages with each other. 26c and 26c are provided. Then, a pair of members 30a, 30b, which are hingedly openable and closable by a swing shaft 28 parallel to the shaft, so that the entire inner pipe member 26 composed of the pair of members 26a, 26a can be grasped from both sides, The outer tube member 30 composed of 30b is formed. That is, the inner pipe member 26 and the outer pipe member 30 form a double pipe structure. The pair of one member 30a forming the outer pipe member 30 is integral, but the other member 30b, 30b is axially divided in half. Further, a pair of members 30 forming the outer tube member 30.
Small-diameter portions 30c, 30c having an inner diameter substantially the same as the outer diameter of the inner pipe member 26 are formed at both axial ends of a, 30b, 30b, and the central portion has a diameter larger than the outer diameter of the inner pipe member 26. Inner peripheral walls 30d, 30d of the portion are formed, and the inner peripheral wall 30
A gap portion 32 is provided between d and 30d and the inner pipe member 26. Further, recesses 30e, 30e ... Into which the flange-like projections 26b, 26b of the inner pipe member 26 are fitted and inserted are provided on both end surfaces of the outer pipe member 30 in the axial direction. Further, the outer tube member 30 is formed with a slit 30f reaching the clearance 32 around the axis. Specifically, one member 30a forming the outer tube member 30 is provided with a slit 30f at the center, and the other members 30b, 30b are cut at a part of the edge of the divided surface divided in half in the axial direction. It is formed so as to become the slit 30f when it is cut and connected. Further, the swing shaft 28 is attached to one member 30a of the outer pipe member 30.
Two pairs of protrusions 30g, 30g are provided on the side substantially opposite to the tightening bolt 3 by the pins 34, 34 parallel to the shaft.
One ends of 6, 36 are swingably connected. and again,
The other member 30b is similarly provided with protrusions 30h, 30h, and U-shaped grooves 30i, 30i are provided from the tip end thereof so that the tightening bolts 36, 36 can be inserted by swinging. The inner tube member 26, the outer tube member 30 and the like form the loose clamp body 22.

Further, one end of the connecting member 24 is moved through a slit 30f and a head capable of swinging around a gap 32 formed between the inner pipe member 26 and the outer pipe member 30 about an axis. A T-shaped projection 24a formed of a free neck portion is formed. The other end of the connecting member 24 has a pair of protrusions 24b, 2
4b is provided, and the frame bodies 12 and 12 of the spacer 10 are appropriately provided.
It is formed so as to be swingably connected to.

In the loose conductor gripping portion 20 having such a structure, the connecting member 24 is previously provided with the frame bodies 12, 12 of the spacer 10.
Is appropriately connected to. Also, the members 30a, 30b, 3
The inner pipe member 26 is fixed to the outer pipe member 30 in which 0b is assembled in the shape of a hinge by the fixing pins 40, 40 .... Further, tightening bolts 36, 36 are swingably connected to the protrusions 30g, 30g, ... Of the outer tube member 30 by pins 34, 34. Moreover, the head portion of the T-shaped projection 24a of the connecting member 24 is inserted into the gap portion 32 between the outer pipe member 30 and the inner pipe member 26, and the neck portion penetrates the slit 30f. Then, the outer pipe member 30 is closed, the tightening bolts 36, 36 are swung and inserted into the grooves 30i, 30i, and the spring lock nuts 38, 38 are screwed onto the tips of the tightening bolts 36, 36 to be temporarily fixed. It The spring lock nuts 38 and 38 are
As shown in Japanese Patent Laid-Open No. 0090, it is a known one that can obtain a predetermined tightening pressure.

When the loose conductor gripping portion 20 grips the element conductor 16, the T-shaped projection 24a is positioned in the gap portion 32 formed on the side of the member 30a which is integral with the outer tube member 30 in the axial direction. As described above, the loose clamp main body 22 is swung in advance. Further, the spring lock nuts 38, 3
8 is loosened and tightening bolts 36, 3 from the grooves 30i, 30i
6 is pulled out so that the outer tube member 30 can be opened. At this time, of course, the inner tube member 26 can also be opened.

In this state, the elemental conductor 16 is closed by straddling the outer tube member 30 so that the elemental conductor 16 is grasped by the inner tube member 26 from both sides, and the tightening bolts 36, 36 are swung to form a groove. Insertion into 30i, 30i and tightening the spring lock nuts 38, 38 completes gripping. In addition, the inner pipe member 26 has the uneven portions 26c, 2 provided on the edges.
The 6c meshes with each other, so that the pair of members does not shift in the axial direction.

In the loose conductor gripping portion 20 having such a structure, the T-shaped projection 24a of the connecting member 24 can swing about the axis within the gap portion 32 and the slit 30f, and the element conductor 16 is formed as shown in FIG. 7 (a). It can be swung counterclockwise with respect to the connecting member 24, and can also be swung clockwise as shown in FIG. 7B. In the loose conductor grip portion 20 of the present invention, the swing range is, for example, 90 ° counterclockwise and 9 ° clockwise.
It is set in the range of 0 ° to 180 °.

As described above, if the element conductor 16 to be grasped is swingable within a predetermined angle range, ice accretion having a circular cylindrical cross section cannot be generated like an element conductor which can be freely rotated, and that much. The load due to icing snow can be reduced. Moreover,
The element conductor 16 can be held while the loose clamp main body 22 is still connected to the connecting member 24, which facilitates the work. This is suitable for high-altitude work such as aerial riding work, since there are no problems such as dropping parts.

Further, a structure for preventing galloping vibration by providing the spacer 10 of the present invention on an overhead power transmission line in which an even number of power transmission lines are installed will be described. As shown in FIG. 8, a plurality of spacers 10, 10 ...
Is provided. Moreover, looking at the line direction, the spacer 10
All the conductor holding portions 14, 14 provided on the right half of the frame body 12 of the frame 12 hold the power transmission lines 42, 42 of the right half on one side, and all the loose conductors provided on the left half of the conductor. With the grips 20 and 20, the transmission lines 42 and 4 on the left half
2 is gripped so as to be swingable around the axis within a predetermined angle range around the axis. Here, the spacers 10, 10, ... Have a balanced weight on the left and right, and by providing the spacers 10, 10, ... No force acts such as twisting and rotating the entire transmission lines 42, 42. Note that, in the simplified diagrams of FIGS. 8 and 9, black circles are conductor gripping portions 1 that grip the power transmission line 42 in a fixed manner.
4 indicates a loose conductor gripping portion 20 that grips the power transmission line 42 in a swingable manner.

By the way, as shown in FIG. 9, if wind blows from the right side when looking at the line direction, the overhead power transmission line composed of a large number of power transmission lines as a whole produces vertical vibrations and ascends. It is known from a wind tunnel experiment that the entire transmission line is twisted clockwise during the above-mentioned case and is twisted counterclockwise during the downward movement. If the torsional rigidity of each power transmission line is the same, the natural frequency of each power transmission line may match, and the rotational movement cycle of the entire transmission line and the vibration cycle of vertical movement may be synchronized. It is known that the amplitude of vertical movement is increased.
In addition, the rotation cycle of a single conductor is longer than that of an overhead power transmission line composed of a large number of power transmission lines, and the rotation cycle of a single conductor is longer than the oscillation cycle of vertical movement, so synchronization is less likely to occur. It is also known that galloping vibration is unlikely to occur.

Therefore, in the overhead power transmission line according to the present invention in which galloping vibration is prevented, as shown in FIGS. 8 and 9, the power transmission lines 42, 42 of one half of one side are fixedly gripped and the half of the other half of the other side is fixed. By swingably gripping the power transmission lines 42, 42, the torsional rigidity of the power transmission lines 42, 42 on one side and the power transmission lines 42, 42 on the other side are greatly different, and the left and right power transmission lines 42 are , 42 ..., The rotational movement cycle of the power transmission line can be greatly disturbed because the rotational movement cycles of the transmission lines 42, 42 ... Moreover, since the left and right power transmission lines 42, 42 ... Have different rotational movement cycles over the entire span, the effect of suppressing galloping vibration over the entire span is great.

The above effects of the present invention can be expected from the results of the following experiments conducted by the inventors. In the experiment, an aerial electric line according to the present invention, in which one half of the four conductors is fixedly gripped and the other half is swingably held around an axis, and a conventional one in which all four conductors are fixedly gripped And the logarithmic attenuation rate of the rotation angle in the rotation direction of the four conductors were measured. Under the test conditions, the span of the overhead electric line was 80 m, and the measurements were made with one spacer and two spacers mounted in this span. Also, the electric wire is ACSR 410 mm ² , and the tension is 20%.
U. T. S. The measurement result shows that the spacer of the present invention is 1
The logarithmic decay rate of the one attached is 0.0208,
The logarithmic decay rate of two spacers is 0.04
It was 05. On the other hand, the logarithmic decrement of the conventional one in which four conductors were fixed and held and one spacer was attached was 0.0140, and the logarithmic decrement of two spacers was 0.0181. . From this experimental result, the present invention has a larger logarithmic decrement than the conventional one in which the four conductors are fixedly gripped, and the galloping can be suppressed. In addition, in the present invention, the logarithmic attenuation rate of two spacers is remarkably increased with respect to one spacer, and in the present invention, further suppressing effect can be expected by increasing the number of spacers.

In the above embodiment, the overhead power transmission line is composed of four power transmission lines 42, 42 ... However, it is needless to say that the overhead power transmission line is applicable to the overhead power transmission line composed of two or more even number power transmission lines 42, 42. In addition, one of the left and right half sides may be fixedly gripped and the other half may be swingably gripped around an axis as viewed in the line direction. The conductor gripping portion that grips and holds the element conductor 16 may have any structure. Further, in the spacer and the overhead power transmission line of the present invention in which galloping vibration is prevented, the structure in which the loose clamp main body 22 is swingably disposed on the connecting member 24 is not limited to the above-described embodiment.

[0032]

As described above, since the spacer of the present invention, the loose conductor gripping portion for the spacer, and the overhead power transmission line in which galloping vibration is prevented are configured, the following special effects are achieved.

In the spacer according to the first aspect, since the element conductors on one half of the spacer are gripped so as to be swingable within a preset angle range, snow accretion with a circular cylindrical section does not occur, An excessive weight is not added to the element conductor due to the development of this icing snow, and there is no fear of disconnection. Then, since the element conductor in one half on one side is swingably held and the element conductor on the other half on one side is fixedly grasped, the torsional rigidity of the element conductor on one half on one side and the element rigidity on the other half on the other side are held. The torsional rigidity of the conductor is different, and the rotational motion cycle of each elemental conductor is different, which can contribute to the suppression of galloping vibration.

In the loose conductor gripping portion for a spacer according to the second aspect of the invention, since the element conductor can swing about the axis within a predetermined angle range but cannot rotate, ice accretion with a circular cylindrical section occurs. Can be prevented.

Further, in the loose conductor gripping portion for the spacer according to the third aspect, the element conductor can be gripped with the loose clamp main body being connected to the connecting member.
The work of gripping the element conductor is easy. In addition, since the work can be performed without separating the constituent parts, there is no problem such as dropping the parts correspondingly, which is suitable for aerial work such as aerial work.

Further, in the overhead power transmission line according to the fourth aspect of the present invention in which galloping vibration is prevented, one half of the even number of transmission lines is swingably held, and the other half of the transmission line is fixedly held. Therefore, the torsional rigidity of the transmission line of one half on one side and the torsional rigidity of the transmission line on the other half of the other side are different, and the natural frequencies are greatly different. The rotation motion cycle as a whole is greatly disturbed, and galloping vibration is suppressed. Moreover, the power transmission line of one half on one side can swing, but cannot rotate, so that snow accretion with a circular cylindrical cross section does not occur and disconnection due to an excessive load due to ice accretion does not occur.

Further, in the overhead power transmission line which prevents galloping vibration according to claim 5, in one span,
Since one half of the power transmission line is swingably held and the other half of the transmission line is fixedly gripped, two groups of transmission lines whose natural vibrations are different in one span are used as a whole span. The rotational movement cycle of is effectively disturbed, and galloping vibration is suppressed.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of an embodiment of a spacer of the present invention.

2 (a) is a view taken in the direction of arrow A in FIG. 1, and FIG. 2 (b) is
It is a B arrow line view of FIG.

FIG. 3 is an enlarged view taken along the line CC of FIG.

FIG. 4 is an exploded perspective view of a loose conductor grip for a spacer used in FIG.

5 is a perspective view of the assembly appearance of FIG. 4. FIG.

6 is an external perspective view of a part of components of the outer tube member shown in FIG. 4 viewed from different directions.

FIG. 7A is a vertical cross-sectional view of a loose conductor gripping portion for a spacer showing a state in which an element conductor is swung 90 ° counterclockwise, and FIG. FIG. 6 is a vertical cross-sectional view of a loose conductor gripping portion for a spacer, which shows a swinging state.

FIG. 8 is a simplified perspective view in which a plurality of spacers are provided in one diameter of the overhead power transmission line.

FIG. 9 is a simplified diagram for explaining the vertical movement locus and the rotation of the power transmission line due to galloping vibration of the overhead power transmission line.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Spacer 12 Frame body 14 Conductor gripping part 16 Elementary conductor 20 Loose conductor gripping part 22 Loose clamp main body 24 Connecting member 24a T-shaped projection 26 Inner tube member 28 Swing shaft 30 Outer tube member 30f Slit 32 Gap 42 42 Transmission line

Claims (5)

[Claims] 1. A loose conductor provided on one side of an axis of symmetry of a frame body, and a conductor holding portion provided on one side of the axis of symmetry fixedly holds the element conductor, and a loose conductor provided on the other side. The gripping part is configured by gripping the element conductor with the loose clamp main body and swingably connecting the loose clamp body to the frame body around an axis of the grasped element conductor within a preset angle range. A spacer characterized in that 2. A loose clamp body which is opened / closed by an oscillating shaft parallel to the element conductor and which is opened and closed and holds the element conductor by a preset angle around the axis of the element conductor gripped. A loose conductor gripping portion for a spacer, characterized in that the loose conductor gripping portion is arranged so as to be swingable within a range and is configured to be coupled to the frame body of the spacer. 3. The loose conductor gripping portion for a spacer according to claim 2, wherein the loose clamp main body is divided into two parts so as to grip the element conductor from both sides, and the inner pipe member is divided into two parts. The outer pipe member is fixed and has a double pipe structure that is divided into two parts that can be opened and closed by the swing shaft, and a gap is formed in at least a part between the inner pipe member and the outer pipe member. Then, a slit reaching the gap is formed around the axis in the outer tube member, and a T-shaped protrusion is provided in the connecting member such that a head is inserted into the gap and the neck is passed through the slit. The character-shaped projection is swingable around the gap and the slit about an axis, and the loose clamp body is disposed on the connecting member so as to swing about the axis of the gripped element conductor. Loose conductor grip for spacers. 4. A spacer is provided on an overhead power transmission line composed of even numbered transmission lines, and a conductor gripping portion provided on one half on the left side or the right side of the frame of the spacer is a half side on one side when viewed in the line direction. Of the power transmission line of the other hand, the loose conductor gripping portion provided on the other half of the other side holds the power transmission line of the other half on the other side by the loose clamp body, The connecting member is disposed on the connecting member so as to be swingable about an axis within a preset angle range, and the connecting member is connected to the frame body. An overhead power transmission line that prevents galloping vibration, characterized in that the torsional rigidity of the power transmission line is different. 5. A plurality of spacers are provided in one diameter of an overhead power transmission line composed of an even number of power transmission lines installed, and when viewed in the line direction, the same frame on the left or right of the frame body of these spacers is provided. One side half of one side fixedly holds the transmission line of one side half, and all loose side grips provided on the other side half of the conductor loosens the transmission line of the other side half Gripping with the clamp body for use, the loose clamp body is swingably arranged around the axis of the element conductor within a preset angle range on the connecting member, and the connecting member is connected to the frame body, An overhead power transmission preventing galloping vibration, characterized in that the torsional rigidity of one half of the power transmission line is different from that of the other half of the power transmission line as viewed in the line direction in one span of the overhead power transmission line. line.