JPH0759237A - Split collar for clamping wire with protrusion - Google Patents

Abstract

PURPOSE:To impart stabilized clamping force constantly by splitting a tubular body into more than two collar pieces, making a spiral grooves in the inner face of each collar piece, and hinging the collar pieces at each split part except one. CONSTITUTION:A tubular body is split into three collar pieces 11A, 11B, 11C and a spiral groove 12 for receiving the protrusion of a wire is made in the inner face of each collar piece 11A-11C. The collar pieces 11A-11C are provided with flange parts 13A-13C at the opposite ends thereof wherein the flange parts 13A, 13B are hinged by means of a hinge pin 14A whereas the flange parts 13B, 13C are hinged by means of a hinge pin 14B. The flange parts 13A, 13C are not hinged and the collar pieces 11A, 11C can be opened or closed around the hinge pins 14A, 14B. This structure impart stabilized clamping force constantly to the wire.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a split collar used when holding an electric wire having a spiral projection on its outer periphery with a clamp such as a spacer or a damper.

[0002]

2. Description of the Related Art Recently, an electric wire 1 having a spiral ridge 2 on the outer circumference as shown in FIG. 4 has been used as an overhead transmission line (Japanese Patent Laid-Open No. 4-87210). This type of ridged wire generally has a transmission voltage of 500,000 to 10
Used for UHV transmission lines of 0,000V.

Although conventional electric wires for overhead power transmission lines have a circular cross section, such electric wires generate wind noise during strong winds, which is an environmental problem. Therefore, a spiral rod is wound around the electric wires to reduce wind noise. . But for UHV transmission lines, 1
Since the number of conductors per phase is as large as 6 to 10, winding the spiral rod around each of them requires time and effort for construction, resulting in an increase in construction cost.

Therefore, the electric wire with a ridge is formed in a part of the outermost layer at the time of manufacturing the electric wire, and the height of the wire 4 is higher than that of the other outermost layer wires 3.
(See FIG. 4) is twisted to form a spiral ridge 2 to reduce wind noise. In addition, in the example of FIG. 4, the protrusions 2 are formed as one set of two protrusions for the purpose of electric field relaxation.

When the electric wire with a ridge as described above is to be gripped by a clamp such as a spacer or a damper, the electric wire is covered with a split collar having a groove into which the ridge is inserted, Generally, the structure is such that a clamp is used (Japanese Utility Model Laid-Open No. 63-137522).

[0006]

However, in a structure in which an electric wire with a ridge is tightened by a clamp through a split collar, the direction of the clamp is determined by the mounting state of a spacer or a damper, and the direction of the split collar is Since it is necessary to match the position of the ridge of the wire, the direction of the clamp and the direction of the split collar are not the same. As a result, when the split surface of the split collar and the split surface of the clamp are substantially perpendicular to each other, the clamping force of the clamp is difficult to be transmitted to the electric wire, and a sufficient clamping force may not be obtained.

An object of the present invention is to secure a stable tightening force regardless of the orientation of the clamp and the collar when the electric wire with ridges is clamped with a collar through a collar having grooves on which the ridges are inserted. Is to provide a split color that can be obtained.

[0008]

In order to achieve this object, the split collar for electric wire clamp with a ridge of the present invention comprises a combination of three or more collar pieces in which a cylindrical body is divided into three or more sections. , A spiral groove is formed on the inner surface of some or all of the collar pieces to receive the ridges of the wire with ridges.
Each of the collar pieces is characterized by being hinged at the other divided portion, leaving one divided portion.

[0009]

Since the split collar of the present invention is formed by combining three or more collar pieces into a cylindrical shape, no matter which direction is tightened by a pair of clamps, tightening force is applied to the wire through each collar piece. Will be transmitted reliably. Further, since each collar piece is hingedly connected to the other divisional part while leaving one divisional part, it is possible to open and close from one divisional part which is not hingedly coupled, and the respective color pieces are not disjointed. Therefore, it is easy to attach to the electric wire and easy to handle.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 and 2 show an embodiment of the present invention. This split collar 11 consists of three collar pieces 11A, 11B and 11C in the form of a cylinder divided into three.
On the inner surface of 11A to 11C, there is formed a spiral groove 12 into which the ridge 2 of the electric wire with ridge 1 as shown in FIG. 4 is inserted.

Each of the collar pieces 11A to 11C has flange portions 13A to 13C at both ends, and the flange portions 13A to 13C are
13B is hinge-coupled by a hinge pin 14A, and flanges 13B and 13C are hinge-coupled by a hinge pin 14B, respectively. However, the flange portions 13A and 13C are not hinged. Therefore, this split collar 11 has hinge pins 14A,
Collar pieces 11A and 11C can be opened and closed with 14B as an axis.

When attaching the split collar 11 to an electric wire,
After opening the collar pieces 11A and 11C and holding the electric wire, the collar pieces 11A and 11C are closed and appropriately rotated around the electric wire so that the protrusion of the electric wire is dropped into the groove 12.

FIG. 3 shows a clamp for the split collar 11 described above.
It shows the state of being gripped at 15. Clamp 15 has a shaft pin on one side
A pair of clamp fittings 15A and 15B hingedly connected with 16
On the opposite side with a tightening member 17 such as a bolt and nut. Since the clamp 11 has such a structure, mainly the tightening force from the vertical direction is applied in FIG. 3, but since the split collar 11 has a three-part structure,
Even if the split collar 11 is located at any position in the circumferential direction, it is possible to tighten the electric wire inside it from almost the entire circumference.

By the way, since there is some variation in the spiral pitch (twist pitch) in the ridges of the electric wire with ridges,
The groove 12 of the split collar 11 must be able to cope with the variation. It is better that the width of the groove 12 is wider in order to cope with variations in the spiral pitch of the ridges,
When the width of the groove 12 is widened, the space between the split collar 11 and the electric wire becomes large. When a transmission line causes a short circuit between phases, a short-circuit current flows from the spacer to the electric wire or in the opposite direction via the split collar. Experiments have shown that if the width of the groove 12 is too wide, an arc due to a gap discharge is likely to be generated in the above-mentioned gap, resulting in a large damage to the electric wire. Therefore, according to the result of examining the allowable range of the width of the groove 12, the groove 12
Is preferably 1.5 times or less the width of the ridge of the wire with ridge.

In the above embodiment, the three-split type split collar is shown, but the split collar may be split into four or more splits.

[0016]

As described above, when the split collar according to the present invention is used, the clamping force of the clamp can be reliably transmitted to the electric wire regardless of the circumferential position of the ridge of the ridged electric wire. The advantage is that the tightening force of the wire with ridges is stable. Further, since the individual collar pieces are hinged and not separated, they can be easily attached to the electric wire and workability is improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a split collar according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of the split collar of FIG.

FIG. 3 is a front view showing a state in which the split collar of FIG. 1 is held by a clamp.

FIG. 4 is a cross-sectional view showing an example of an electric wire with ridges.

[Explanation of symbols]

 1: Wire with ridge 2: Ridge 11: Split collar 11A, 11B, 11C: Collar piece 12: Groove 13A, 13B, 13C: Flange portion 14A, 14B: Hinge pin 15: Clamp 15A, 15B: Clamp metal 16: Shaft Pin 17: Tightening member

Claims (2)

[Claims] 1. A spiral shape comprising a combination of three or more collar pieces in which a cylindrical body is divided into three or more parts, and a ridge of an electric wire with a ridge is formed on the inner surface of part or all of the collar pieces. The split collar for a wire clamp with a ridge characterized in that the groove is formed, and each collar piece is hinge-coupled at the other divided portion while leaving one divided portion. 2. The split collar according to claim 1, wherein the width of the spiral groove on the inner surface is 1.5 times the width of the ridge of the wire with ridge.
Characterized by being less than double.