JP2009022101A - Boltless spacer for transmission line - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for arrangement of a spacer frame of a boltless cable clamp and a light and inexpensive spacer for transmission cables, which can sharply reduce radio disturbance caused by corona generation to a radio, a television, etc., due to its high potential gradient such as in a UHV transmission line, and corona noise which arises by raindrops, etc. formed around the boltless clamp in rainy weather. <P>SOLUTION: This is a boltless spacer suitable for a UHV transmission cable, which is provided, in opposition at two points of the outside plane of the chamber, with rotation preventing stoppers for keeping the regular setting posture of the boltless cable clamps, when the boltless cable clamps are attached radially, so that gyro motion may be possible, in symmetry about the axis of a frame in the shape of a regular polygon, and the boltless cable clamps are coupled with terminals and are assembled to a chamber, and is constituted so that the clam coupling parts of the boltless cable clamps may be positioned, being displaced right and left by ±θ° from on the axes of symmetry of a polygonal conductor which becomes the largest potential gradient. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a boltless spacer for a multi-conductor electric wire, and more specifically, a DC or AC ultra-high voltage, in which a regular polygon is formed by 6 to 10 electric wires constituting one phase. (UHV) It is related with the structure of the boltless spacer for multiconductors suitable for being used for a power transmission line.

  Examples of conventional boltless wire gripping portions of this type include those described in FIGS. 8 to 10 of Patent Document 1 and FIGS. 1 to 3 of Patent Document 2.

No. 07-056572 Japanese Patent Laid-Open No. 08-228422

  In FIG. 1 to FIG. 11 of Patent Document 1, reference numeral (1) denotes a boltless electric wire gripper body, and a presser foot (2) is rotatably attached by a pin (3). 4) is pinched and gripped. Further, the boltless wire gripping part main body (1) is provided with a through hole (5) through which a T bolt described later passes through the opposite side of the pin (3) with respect to the electric wire (4). On the opposite side of the presser foot (2) with respect to (5), the U-shaped part (11) having the axial center of the through hole (5) substantially at the center is integrated with the boltless wire gripping part body (1) Provided. Further, a screw hole (12) through which a screw member described later, for example, a set screw, is threaded is provided at the bottom of the U-shaped part (11). Further, the boltless electric wire gripping part (1) is attached to the tip of the boltless electric wire gripping part main body (1) opposite to the pin (3) with respect to the electric wire (4), for example, to a spacer frame (not shown). A connecting part (14) is provided.

  Next, (21) is the T bolt described above, and as shown in FIGS. 1, 2, 3, 6, 7, 11 and the like, a T portion (21c) is provided at the tip thereof. In addition, a threaded portion (21b: FIG. 3) is formed at the end. Furthermore, as shown in FIG. 12, a fork (15) is formed at the end opposite to the pin (3) with respect to the electric wire (4) of the presser foot (2) corresponding to the through hole (5). The width L is wider than the width of the T portion (21c) of the T bolt (21) and the T bolt (21) is passed through the through hole (5). ) Is coincident with the longitudinal direction of the fork (15), the T part (21c) can pass through the fork (15), and the two directions intersect each other. In some cases, it cannot be passed.

Further, the screw member (21b) of the T-bolt (21) is provided with a nut (7) and a washer (8), and a boltless electric wire gripping body body (8) provided with the washer (8) and a through hole (5). 1), an elastic member, for example, a compression coil spring (9) is provided to constitute a spring device (10).
Furthermore, when a screw member, for example, a push screw (13), screwed into a screw hole (12) formed in the bottom of the U-shaped part (11) of the boltless electric wire gripping part main body (1) is screwed, The T bolt (21) is brought into contact with the end face of the T bolt (21), and the T bolt (21) is moved to the T portion (21c) side against the tension of the compression coil spring (9).

  Since the conventional boltless electric wire gripping portion is configured as described above, when gripping the electric wire, the T portion (21c) of the T bolt (21) is aligned with the fork portion (15) and the push screw (13 ). In this state, after putting the electric wire (4) between the boltless electric wire gripping part main body (1) and the presser foot (2), the presser foot (2) is closed to face the boltless electric wire holding part main body (1). . At this time, in a state where the push screw (13) is returned, the T portion (21c) of the T bolt (21) enters the fork (15) of the presser foot (2), but the T portion (21c) Since it does not come out from the surface of the presser foot (2), the T bolt (1) cannot be rotated and the T portion (21c) cannot be hooked on the fork (15). Therefore, by rotating the push screw (13) and pushing it in, the compression coil spring (9) is compressed and the T bolt (21) is moved to the T portion (21c) side, whereby the T portion (21c) is moved. Project from the surface of the presser foot (2). Therefore, in this state, the T bolt (21) can be rotated.

  Next, the T bolt (21) is rotated so that the T portion (21c) and the fork portion (15) cross each other, particularly perpendicular to each other, and then the set screw (13) is returned and removed, and the compression coil spring (9 ), The T bolt (21) is loaded in the direction of the threaded portion (21b), the T portion (21c) is pressed against the surface of the presser foot (2), and thereby the electric wire (4) is gripped. When the T-bolt (21) is rotated so that the T portion (21c) and the fork portion (15) intersect, in particular, perpendicular to each other, as shown in FIG. A special tool of a shape is fitted and rotated 90 degrees to be locked.

  The electric wire gripping device of Patent Document 2 has a clamp body (1A) body having a semi-cylindrical first recess (C1) and a semi-cylindrical second recess (C2), and can be opened and closed to the clamp body. A clamp lid (1B) that clamps an electric wire in a cylindrical recess formed by the first recess and the second recess by closing to the clamp body side, and an electric wire in the cylindrical recess A head (2A) that is placed between the clamp body clamped and the clamp lid and has a width that can be engaged with the clamp lid and a length that prevents disengagement of the clamp lid, and non-clamp A holding member having a rod-like portion (2B) that passes through in a fixed manner, elastic means for generating an elastic force that presses the head of the holding member engaged with the clamp lid against the clamp lid, and the elasticity Force does not act on the clamping member Elastic force releasing means for releasing the elastic relationship between the elastic means and the clamping member as described above, the electric wire is clamped in the cylindrical recess of the clamp body and the clamp lid, and the elastic force releasing means In a state where the elastic relationship is released, the head of the clamping member is engaged with the clamp lid, and the clamping member head is rotated to prevent the engagement relationship from being released, and then the elastic force is released. An electric wire gripping device configured to prohibit release of an elastic relationship by means and press the head of the clamping member against the clamp lid by the elastic force of the elastic means.

  Since the conventional device of Patent Document 1 is configured and operates as described above, the variation in the gripping force of the electric wire is extremely small, and it can be confirmed after construction that a predetermined gripping force is applied by removing the push screw. Not necessary and has many other advantages, but on the other hand, when the T part is crossed and engaged with the fork part, the T bolt is crossed and engaged outside the latch wrench used to remove the push screw. In order to achieve this, the compression force is applied to the T-bolt shaft by the push screw, so it cannot be manually crossed and engaged, requires a special bifurcated tool, and has an unstable height Had the problem of being inconvenient.

  The conventional device of Patent Document 2 solves the problem of Patent Document 1 and does not require a special tool, but on the other hand, a spring provided on the other end side of the T-bolt head to make the T-bolt head rotatable. The spacer for the UHV transmission line, which has a complicated structure of the receiving portion and requires a large number of boltless wire gripping portions, has a problem that the weight of the entire spacer increases and the cost increases. .

  In addition, in any of the above patent documents, only the structure of the boltless electric wire gripping part is shown, but, like the UHV transmission line, the potential gradient is high, and radio wave interference due to corona generation to radio / TV, The method (means) for arranging the boltless wire gripping part on the spacer frame to reduce as much as possible corona noise caused by raindrops formed around the boltless wire gripping part in the rain is not shown. However, the conventional design has a common problem that the boltless wire gripping portion becomes excessively heavy, and it is not possible to provide a lightweight and inexpensive spacer for the UHV transmission line.

(1) In order to achieve this object, a transmission line boltless spacer suitable for UHV of the present invention is a regular polygonal frame that is formed by connecting (joining) the chamber (15) by welding with a connecting rod (20). (23), and boltless wire gripping portions (30) are radially attached to the chamber (15) in such a manner that the frame (23) is axisymmetric with respect to the frame (23). ) Is connected to the terminal (14) and assembled to the chamber (15), a rotation (rotation) prevention stopper (22) for maintaining the normal assembly posture of the boltless wire gripping portion (30) is provided in the chamber. (15) A boltless spacer for a transmission line, which is provided to face a predetermined place (two places on a plane).

(2) Moreover, the boltless spacer for power transmission lines of the present invention has a structure in which the clamps (1) and 2 of the boltless wire gripping part (30) of (1) can be opened and closed around the connecting pin (3p). While clamping the electric wire between (1) and (2), the clamp (1) is clamped to the clamp (1) by the tightening spring (5) that loads the T-bolt (4) and T-bolt (4) on the threaded portion side ( 2) The bolt-less electric wire gripping part configured to release the pressing of the clamp (2) to the clamp (1) by the pressing bolt (9) that presses the T-bolt (4) on the T-part side. In (30), the connecting portion (3) of the clamps (1) and (2) is displaced by ± θ ° from the symmetry axis of the multiconductor.

(3) The range of θ in (2) was set as follows.
± 25 ° ≦ θ ≦ ± 45 °

(4) In the boltless spacer for power transmission lines of (1) to (3) of the present invention,
A hexagonal groove (25) was formed in the outward direction on the T portion side of the T bolt (4) of the boltless wire gripping portion (30).
(5) In the transmission line boltless spacer of (1) of the present invention,
The said rotation prevention stopper (22) is provided facing two places of the outer plane of a chamber (15).

[Operation]
In the spacer according to the present invention, the boltless wire gripping portion is radially attached to the frame so that the gyro motion is possible, and thus can move smoothly in all directions. Even if various types of vibrations occur, it is possible to follow these movements without resistance, without causing excessive stress in the vicinity of the spacer mounting portion, and it is possible to always keep the electric wire in a safe state.

In addition, since the anti-rotation stopper (22) for maintaining the normal assembly posture of the boltless wire gripping portion (30) is provided facing two locations on the outer plane of the chamber (15), Since it can be attached in a normal attachment state without the direction being separated, it can be attached to the electric wire with good aesthetics regardless of the skill of the installer.
In addition, inspection after construction, especially whether the long groove (24) of the clamp (2) and the T portion of the T bolt (4) are locked at a right angle as shown in FIG. Since inspection can be confirmed from the beginning, construction defects can be eliminated reliably.

  Further, since the hexagonal groove (25) is formed in the outer direction on the T portion side of the T-bolt (4), for example, a general-purpose tool such as a hexagonal wrench spanner can be used to easily fit the hexagonal groove (25). Since the portion can be engaged with the long groove (24), it can be a boltless spacer that is unlikely to cause poor construction.

  As described above, since the boltless spacer for power transmission lines of the present invention is configured, the following special effects are produced.

(1) In the spacer of the present invention, since the boltless wire gripping portion is movably attached to the frame so as to enable gyro motion, the stress generated in the boltless wire gripping portion can be effectively relieved. Moreover, since the stopper (22) which prevents rotation (rotation) is provided in the chamber (15), the mounting shape of the boltless electric wire gripping portion can be made to be a uniform mounting shape. Inspection work can be facilitated.

(2) In the spacer of the present invention, the connecting position of the hinge pin having a small curvature radius at the symmetrical axis position where the potential gradient is maximum is shifted by ± θ °, and the clamp portion having a large curvature radius is positioned. It is possible to provide a boltless spacer for UHV transmission lines, which makes it difficult for raindrops with sharp shapes to be formed, and does not cause radio or TV noise disturbance or corona noise pollution during light rain.

(3) In the spacer of the present invention, by setting the angle range of θ to the following value, it is possible to greatly reduce radio wave interference to radios and televisions, and to greatly reduce corona noise during light rain. . ± 25 ° ≦ θ ≦ ± 45 °

(4) In the spacer of the present invention, since the hexagonal groove (25) is provided in the head of the T bolt (4), the axial force based on the reaction force of the clamping spring is applied to the T bolt (4) by the push bolt (9). Even in the acted state, a hexagon wrench or the like can be inserted into the hexagonal groove (25) provided in the head of the T bolt (4), and can be easily rotated and engaged, thus providing excellent workability. A boltless spacer for a UHV transmission line can be provided.

An embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 is a front view of an 8-conductor boltless spacer when the spacer of the present invention is applied to a UHV 8-conductor transmission line.
Figure 2 is an enlarged sectional view of Borutoresu electrical wire gripping unit 30 _1.
FIG. 3 is a front view of a 6-conductor boltless spacer for an ultrahigh voltage transmission line or UHV transmission line.
In the following description, for the 8-conductor and 6-conductor boltless spacers, the mounting interval to the frame is 45 ° for the former and 60 ° for the latter. Since the basic structure of the connection is the same, an 8-conductor boltless spacer will be described.

First, the structure of the spacer of the present invention will be described by taking a boltless spacer for eight conductors as an example. As shown in FIG. 1, the 8-conductor boltless spacer is formed by welding a connecting rod (20) to a cylindrical chamber (15) to form an 8-conductor frame (23). The angle between the chamber (15) are formed at equal intervals of 45 °, attaching a Borutoresu electrical wire gripping unit 30 ₁ to 30 ₈ in the chamber and radially symmetrically.
Incidentally, Borutoresu wire gripper for gripping the conductors (C) (wire diameter _{= Φ34.4mm) (30 1 ~30 8} ) , in order to avoid a reduction in corona characteristic, the Borutoresu electrical wire gripping unit connecting pin (3p) The position is shifted from the axis in the left-right direction (θ °).
The reason for this is that the clamps (1) and (2) are openable and closable around the connecting pin (3p), and the radius of curvature of the part is usually about R10 to R12 mm, and the part is clamped ( 2) If the curvature radius is about the same as the radius of curvature of the back surface (R30 to 45 mm in the normal design for the above wire diameter), the thickness will increase and the weight of the boltless wire gripping portion will increase. This is because it is necessary to design with a radius of curvature.

In particular, a spacer for a UHV transmission line has a higher potential gradient than a general transmission line. Therefore, if a portion having a projection with a small radius of curvature is provided so as to coincide with the axial direction, raindrops and the like are generated particularly in rainy weather. There is a problem that it is likely to be formed at the location, a sharper protrusion is formed and corona is likely to occur, and it becomes a noise noise source for radio and television and a source of pollution noise such as corona noise.
Therefore, in the present invention, the position of the back surface of the clamp (2) where the radius of curvature of the axial direction portion can be increased by displacing the position of the connecting pin (3p) by θ ° from the axial direction where the potential gradient is highest is located. In this way, a design method for reducing electric field was adopted. A specific value of θ is preferably about ± 25 ° to ± 45 ° of the symmetry axis.

FIG. 2 is an enlarged sectional view of the boltless electric wire gripping portion 301 of FIG. ₁ , and the function of the boltless clamp of the present invention will be described with reference to this sectional view.
A boltless electric wire gripping portion 30 shown in FIG. 2 includes a clamp body 1 and a clamp cap 2 and is connected to be freely opened and closed with a hinge pin 3 as an axis. The figure shows a state in which the clamp cap 2 is closed. A substantially U-shaped saddle (26) is formed on the back surface of the clamp body 1, and a hollow portion (27) is formed on the inside thereof.

  Further, a T-bolt (4) is inserted from the wire gripping side of the clamp body (1), and a tightening spring (5) and a flat washer (6) are attached from the threaded side of the T-bolt (4), and a nut (7) After screwing and adjusting the tightening to a predetermined position, the fixing sleeve (8) is fitted and fixed by pressure. A screw hole is provided on the U-shaped saddle (26) side, and a push bolt (9) is attached to the screw hole so that a predetermined amount of bolt shaft center on the screw portion side of the T bolt (4) is provided. It is configured to press.

A clevis portion (28) for connecting the terminal (14) is formed on the opposite side where the clamp body (1) and the clamp cap (2) are connected by a hinge pin (3p). Are connected with a connecting bolt (10), and the tip screw portion of the connecting bolt (10) is fixed with a spring pin (13) to prevent loosening.
The buffer spring (12) concentrically mounted on the connecting bolt (10) is applied to absorb noise between the clevis portion and the terminal and prevent noise. The flat washer (11) is used for holding the buffer spring (12).
On the opposite side of the terminal, a threaded portion is provided. The threaded portion is inserted into the chamber (15), and a coil spring (16) and a flat washer (17) are attached, and a grooved nut (18) is provided. Tighten with a split pin (19) to prevent loosening.

The inside of the chamber is formed with a two-stage cylindrical cavity with different inner diameters, the opening side of the chamber is formed with a large diameter, and the outer edge of the flat washer (11) is the large-diameter cavity of the chamber. Since the flat washer (11) and the step on the opening side of the small diameter part have a gap of several millimeters, the coil spring (16) expands and contracts in response to the movement of the electric wire. The terminal (14) has a structure capable of gyro motion.
Further, (22) is a rotation prevention stopper for maintaining the normal assembly posture of the boltless electric wire gripping portion (30), and is provided opposite to two places on the outer surface of the chamber in the shape as shown in FIG. ing.

In such a configuration, the state of attachment of the boltless spacer for the UHV transmission line of the present invention to an electric wire will be described with reference to FIGS.
FIG. 5 is a side view showing a state in which the clamp cap (2) of the embodiment of the boltless electric wire gripping portion (30) of the present invention is opened, and FIG. FIG. 7 is a plan view showing a state in which the clamp cap (2) is closed and the T-bolt (4) is not engaged with the clamp cap (2) in FIG. FIG. 8 is a plan view showing a state in which the clamp cap (2) is closed and the T-bolt (4) is rotated 90 degrees and engaged in FIG.
As shown in FIGS. 5 and 6, the axial position of the T-bolt (4) is restricted by the push bolt (9), and the T-bolt (4) is connected to the U-shaped groove ( 24).

  Then, as shown in FIGS. 6 and 8, the clamp cap (2) is closed to hold the electric wire (C), and the T bolt (4) is rotated 90 degrees around the axis to engage with the clamp cap (2). Can be combined. Further, if the push bolt (9) is loosened and pulled out, the electric wire (C) is properly held by the elasticity of the clamping spring (5).

By the way, in the work process in which the T bolt (4) is engaged with the U-shaped groove (24) of the clamp cap (2) by rotating the head of the T bolt (4) by 90 degrees, Since the hexagonal groove (25) is provided in the head, it is extremely easy to insert a commercially available hexagon wrench into the groove and rotate it 90 degrees.
7 and 8, W1 and W2 are formed with high stepped wall surfaces, and in these drawings, the head of the T bolt (4) can be turned only counterclockwise. . Therefore, when the head is turned 90 degrees, the side of the head of the T-bolt (4) abuts against these high-level wall surfaces so that it cannot be rotated any further. If it is, it can be sensed that proper construction has been completed.

It is a front view of the boltless spacer for 8 conductors of this invention. _{2 is} an enlarged cross-sectional view of a boltless electric wire gripping portion 301. FIG. It is a front view of the boltless spacer for 6 conductors of this invention. It is a three-dimensional perspective view which shows the shape of the rotation prevention stopper provided facing two places of the outer surface of a chamber. It is a side view which shows the state which opened the clamp cap of one Example of the boltless electric wire holding part of this invention. It is a side view which shows the state which complete | finished the holding | grip operation | work of an electric wire in FIG. FIG. 6 is a plan view showing a state in which the clamp cap is closed in FIG. 5 and the T-bolt is not engaged with the clamp cap. FIG. 5 is a plan view showing a state in which the clamp cap is closed and the T-bolt is rotated 90 degrees and engaged in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Clamp body 2 Clamp cap 3 Connection part 3p Hinge pin 4 T bolt 5 Clamping spring 6 Plain washer 7 Hex nut 8 Nut fixing sleeve 9 Push bolt 10 Connection bolt 11 Plain washer 12 Buffer spring 13 Spring pin 14 Terminal 15 Chamber 16 Coil spring 17 Plain washer 18 Grooved nut 19 Split pin 20 Connecting rod 21 Display mark 22 Anti-rotation stopper 23 Frame (spacer frame)
24 U-shaped groove 25 Hexagonal groove 26 U-shaped saddle part 27 Cavity part 28 Clevis part 30, 30 ₁ to 30 ₈ , Boltless type electric wire gripping part C Electric wire W1, W2 High step wall θ Displacement angle of hinge pin

Claims (5)

A plurality of connecting rods (20) connect the same number of chambers (15) to form a regular polygonal frame (23),
Boltless wire gripping portions (30) are radially attached to the chamber (15) via terminals (14) so as to be axially symmetric with respect to the frame (23),
An anti-rotation stopper (22) for maintaining the normal assembly posture of the boltless wire gripping portion (30) when the boltless wire gripping portion (30) is connected to the terminal (14) and assembled to the chamber (15). Is provided at a predetermined location of the chamber (15). In the boltless spacer for power transmission lines according to claim 1,
The boltless wire gripping part (30)
A clamp (1) and a clamp (2) are provided, and the connecting portion (3) of the clamp (1) and the clamp (2) can be opened and closed around the connecting pin (3p).
An electric wire is clamped between the clamps (1) and (2), and the clamp (1) is clamped by a T-bolt (4) and a tightening spring (5) that loads the T-bolt (4) on the threaded portion side. ) Press the clamp (2)
The push bolt (9) that loads the T bolt (4) on the T portion side is configured to release the pressure of the clamp (2) on the clamp (1),
For transmission lines, characterized in that the connecting portion (3) including the connecting pins (3p) of the clamps (1), (2) is displaced by ± θ ° from the axis of symmetry of the multiconductor electric wire. Boltless spacer. In the boltless spacer for power transmission lines according to claim 2,
The range of θ is a range of “± 25 ° ≦ θ ≦ ± 45 °”. In the boltless spacer for power transmission lines according to any one of claims 1 to 3,
A boltless spacer for a transmission line, wherein a hexagonal groove (25) is formed in an outward direction of the T portion of the T bolt (4) of the boltless electric wire gripping portion (30). In the boltless spacer for power transmission lines according to claim 1,
The rotation-preventing stopper (22) is provided to face two locations on the outer plane of the chamber (15), and is a boltless spacer for power transmission lines.

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