JPH059130U - Difficult snow landing ring for overhead power lines - Google Patents

Abstract

(57) [Summary] [Structure] A pair of rigid arc portions 3 connected by a hinge portion 4.
Thick grooves 7 and thin grooves 8 through which water droplets flowing along the overhead power transmission line 1 can pass are alternately formed on the inner peripheral surfaces of A and 3B. [Effect] When water drops flowing along the surface of the overhead power transmission line are dammed at the snow-difficulty ring and fall, they may form icicles. However, according to the above configuration, the water drops form the grooves 7 and 8. It does not pass and is not stopped by the snow-drinking ring 2. For this reason, icicles cannot be formed and accidents due to falling icicles can be prevented. Further, the convex portion 9 between the thick groove 7 and the thin groove 8 is deformed, and the tightening stress of the overhead power transmission line becomes substantially uniform.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a snow landing ring for overhead power transmission lines.

[0002]

[Prior Art]

 If wet snow adheres to the overhead power transmission line, it will rotate along the folds of the overhead power transmission line due to its own weight and gradually develop into thick snow cylinders. May lead to. In order to prevent such an accident, conventionally, as shown in FIG. 2, a plastic snow-driving ring 2 is attached to the overhead power transmission line 1 at appropriate intervals (Act No. 52-42381). Gazette, Jitsukai Sho 60-147934 gazette, etc.).

In this snow-hardening ring 2, a pair of rigid arc portions 3A and 3B are openably and closably connected by a flexible hinge portion 4, and are fitted to the open ends of the rigid arc portions 3A and 3B. The structure has parts 5A and 5B. Ribs 6 are formed on the inner surfaces of the rigid arc portions 3A and 3B so as to be crushed when the overhead power transmission line 1 is tightened in the circumferential direction, whereby the overhead power transmission line 1 is securely tightened.

[0004]

[Problems to be solved by the device]

 When the temperature around the overhead power transmission line is 0 ° C or lower and the temperature on the surface of the overhead power transmission line is about 5 ° C or higher, if snow adheres to the overhead power transmission line, the snow that adheres will melt on the surface of the wire and become water droplets. It flows along the surface and is dammed down by the snow ring and falls. At this time, water droplets may freeze on the snow-drinking ring because the material of the snow-drinking ring is plastic with poor heat conductivity and the ambient temperature is 0 ° C or lower. This frost may grow over time and become icicles with a length of several tens of centimeters, and there is a risk that the icicles may fall due to their own weight or temperature rise, resulting in an accident.

[0005]

Means for Solving the Problems The present invention provides a snow-hardening ring that solves the above-mentioned problems, and has a structure in which a pair of rigid arc portions are connected by a hinge portion so as to be openable and closable. In a hard-to-snow snow ring for overhead power transmission lines that has a fitting joint formed on the open end side of the rigid arc, a thick water drop that passes along the surface of the overhead power transmission line is passed through the inner surface of the rigid arc. The groove and the thin groove are alternately formed at a predetermined interval in the circumferential direction.

[0006]

[Action]

 Icicles are generated at the mounting part of the snow-difficulty ring because water droplets flowing along the surface of the overhead power transmission line are stopped by the snow-difficulty ring, and are cooled by the outside air temperature until it freezes. This is because. In other words, the water flowing along the surface of the overhead power transmission line does not freeze while it is attached to the surface of the overhead power transmission line, and there is no risk of freezing as it falls directly from the surface of the power transmission line. Therefore, if the grooves as described above are formed on the inner surface of the rigid arc portion of the snow-retaining ring so that the water droplets flowing along the surface of the overhead power transmission line can pass through these grooves, the snow-retaining ring attachment part The risk of icicles disappearing.

[0007] In a normal case, water droplets on the surface of the overhead power transmission line flow along the grooves between the outermost layer strands. Therefore, in order to most easily pass through the water droplets, the thick groove is used as the outermost layer of the overhead power transmission line. It is desirable to form it corresponding to the groove between the wires.

On the other hand, if a large number of grooves in the electric wire direction are formed on the inner surface of the rigid arc portion, it is not possible to form a circumferentially continuous rib for ensuring the tightening of the overhead power transmission line as in the conventional case. . Therefore, in the present invention, by forming thick grooves and thin grooves alternately, the convex portions between the grooves are made small, and these convex portions are deformed according to the surface shape of the overhead power transmission line when tightening. By doing so, the tightening of the overhead transmission line was ensured.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention. In this snow landing ring 2, a pair of rigid arc portions 3A and 3B are openably and closably connected by a hinge portion 4, and fitting joint portions 5A and 5B are provided on the open end sides of the rigid arc portions 3A and 3B. Although it is similar to the conventional one in terms of points, a thick groove 7 and a thin groove 8 that allow water droplets flowing along the overhead power transmission line 1 to pass through are provided on the inner peripheral surfaces of the rigid arc portions 3A and 3B at predetermined intervals in the circumferential direction. The feature is that they are formed alternately.

The inner diameter of the thick groove 7 is about 5 to 8 mm, and the inner diameter of the narrow groove 8 is about 2 to 5 mm. The thick groove 7 is formed so as to correspond to the groove between the outermost layer wires of the overhead power transmission line 1 in order to make it easier for water droplets to pass through. Further, in this way, the thin groove 8 is positioned on the top of the outermost layer wire, and the convex portion 9 between the thick groove 7 and the thin groove 8 is deformed so as to straddle the outermost wire layer. 1 tightening is sure. In order to deform the convex portion 9 when tightening the overhead power transmission line 1, the radius of curvature of the inner surfaces of the rigid arc portions 3A and 3B (without the grooves 7 and 8) is set to be smaller than the radius of the overhead power transmission line 1. Of course, it may be a little smaller.

Next, the test results of the snow-hardening ring of the present invention and the conventional snow-driving ring will be described. The snow-diffusing ring of the present proposal has a structure as shown in FIG. 1, in which the thick groove 7 has an inner diameter of 6 mm and the narrow groove 8 has an inner diameter of 3 mm. On the other hand, the conventional snow-hardening ring has a structure as shown in FIG. The material is polycarbonate in both cases. Attaching these snow-retaining rings to an electric wire stretched at an inclination of 2 ° to 4 °, keeping the ambient temperature at about -2 ° C, the outer peripheral surface temperature at about 5 ° C, and one drop on the electric wire surface. Water of about 5 ° C. was flowed every tenth of a second.

Observation of two snow-diffusing rings after 12 hours in this state revealed that two icicles having a length of about 1 cm and a root diameter of about 4 mm were generated on the conventional snow-diffusing ring. No icicles were found in the snow-drinking ring of the present invention.

[0013]

[Effect of the device]

 As described above, the snow-difficulty ring according to the present invention is formed with the thick groove and the thin groove on the inner peripheral surface of the rigid arc portion through which the water droplets flowing along the overhead power transmission line pass, so that the surface of the overhead power transmission line is Water droplets flowing along will pass through these grooves and will not be blocked by the snow-drinking ring and will not fall. For this reason, it is possible to prevent icicles from being generated at the snow ring attachment part of the overhead power transmission line, and thus to prevent accidents due to the falling of icicles. Further, the convex portion between the thick groove and the narrow groove is deformed to tighten the overhead power transmission line, so that the overhead power transmission line can be securely fastened and the tightening stress can be applied even if there is some variation in the diameter of the overhead power transmission line. There is an advantage that it can be made almost uniform.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a snow landing ring according to the present invention.

FIG. 2 is a cross-sectional view showing an example of a conventional snow landing ring.

[Explanation of symbols]

1: Overhead power transmission line 2: Snow landing ring 3A, 3B:
Rigid arc part 4: Hinge part 5A, 5B: Coupling part 7: Thick groove
8: Fine groove 9: Convex part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Nobuyuki Nakamura Inventor Nobuyuki Marunouchi 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Inside Furukawa Electric Co., Ltd.

Claims (1)

[Claims for utility model registration] [Claim 1] A pair of rigid circular arc portions are openably and closably connected by a hinge portion, and a fitting type coupling portion is formed on the open end side of the rigid circular arc portions. In the snow accretion ring, a thick groove and a thin groove through which water droplets flowing along the surface of the overhead power transmission line pass are alternately formed on the inner peripheral surface of the rigid arc portion at predetermined intervals in the circumferential direction. A snow-fighting ring for overhead power lines.