JPH11297143A - Polymer insulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form such structure that snow falls before accumulation by tapering in at least one direction the cross section shape of an insulating outer cover part formed on an insulating core body. SOLUTION: A polymer insulator 10 used for holding an overhead transmission line is formed by forming an insulating outer cover 12 on a rod-shaped insulative core body mounting holding metal fitting 14 at each end, large and small shades 16, 17 are alternately formed in the body 15. The cross section shape of the insulating outer cover 12 part of the polymer insulator 10 is tapered (for example, a water drop shape) in the either direction of the body part 15 and the shades 16, 17, and by constructing so as to direct the tapered part upward, snow hardly lays. The cross section shape of the insulating outer cover 12 part is not limited to the water drop shape, some inclined form such as an ellipse or a rhombus whose corners are rounded is allowable. Drop in insulation capability caused by snow is prevented in a small space and at a low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polymer insulator suitable for use as a traction insulator or the like.

[0002]

2. Description of the Related Art In recent years, polymer insulators which are relatively lightweight and have excellent resistance to fouling have been used in place of porcelain insulators. This polymer insulator is used for a tension insulator or the like which is used to hold a transmission line at a steel tower or the like. The polymer insulator generally has an insulating core made of fiber reinforced plastic or the like, and an insulating outer shell made of a polymer material formed on the insulating core.

[0003] Conventionally, when snow is piled up on an insulator and the snow hardens and falls, the insulator immediately below is damaged or a structure on the ground is damaged, and when snow is covered, the creepage distance of the insulator is shortened. This leads to accidents such as flashover. Therefore, various improvements have been proposed so that snow does not accumulate on the insulator, or even if snow accumulates, the insulator quickly falls.

[0004] For example, as shown in FIG.
Are combined using yoke plates 43a and 43b to form an insulator string 47. The yoke plate 43b at one end of the insulator string 47 is fixed to the tower arm 41 and the other end 43a is fixed to the overhead transmission line 46. In order to prevent continuous accumulation of snow between the tower and a charged part such as the electric wire side yoke plate 43a, the insulator 44 is used to prevent the snow from being piled up on the tower arm 41, the insulator string 47, and the electric wire 46. By keeping the distance between them large, snow cover was prevented.

[0005] In order to prevent snow from being accumulated between the insulator and the tower arm, the insulator and the tower arm are not connected by snow.
As shown in FIG. 5, in this wire retaining section, when the power transmission line 56 is fixed to the steel tower arm 51, the insulator 54 is fixed to the steel tower arm 51 via the rod 58, so that the distance between the insulator and the steel tower arm is increased. It was empty.

[0006]

However, in order to increase the space between the insulators of the multiple insulators (FIG. 4 shows an example of the dual insulators), a metal fitting such as a yoke plate for fixing the insulators is increased. However, there is a problem that weight and cost are increased. On the other hand, if the distance between the insulator and the tower arm is increased, the jumper device must be lengthened, so that a larger space is required and the cost is increased.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problem caused by snow covering of the insulator by utilizing the large degree of freedom of forming the insulating sheath in the polymer insulator.
In a polymer insulator provided with an insulating core and an insulating sheath formed on the core, a cross-sectional shape of the insulating sheath is tapered in at least one direction. A polymer insulator is provided.

[0008]

1 and 2 show an embodiment of the present invention. FIG. 2 is a sectional view taken along the line AA ′ of the polymer insulator 10 shown in FIG. The polymer insulator 10 is a tension insulator used to hold an overhead transmission line. The holding insulators 14 are attached to both ends of a rod-shaped insulating core 11, and the insulating sheath 12 is placed on the insulating core 11. Is formed. The insulating outer skin 12 has large and small caps 16, 1 on the body 15.
7 are alternately formed.

[0009] The insulating sheath 12 of the polymer insulator 10 of the present invention.
The cross-sectional shape of the portion is such that both the trunk portion 15 and the cap portions 16 and 17 are tapered toward one (in FIG. 2, the shape is a water drop shape). Therefore, FIG.
When the tapered portion of the insulator 10 is laid upward as described above, even if the snow 20 is piled up, the insulator 10 immediately falls and hardly covers the snow as shown in FIG.

The cross-sectional shape of the insulating outer skin portion of the polymer insulator is not limited to the water drop shape shown in FIG. The object of the present invention is achieved by laying a polymer insulator with the pointed portion facing upward, in any shape.

The insulating sheath may be specially formed on the insulating core, or may be separately prepared and then attached to the insulating core with an adhesive or the like.

[0012]

According to the polymer insulator of the present invention, since the cross-sectional shape of the insulating sheath portion is tapered in one direction, snow does not accumulate, or even if snow accumulates, it does not grow before it grows large. Fall. Therefore, even if the distance between the tower arm and the adjacent insulator is not necessarily large, it is possible to prevent a decrease in insulation due to snow in a smaller space and at a lower cost.

[Brief description of the drawings]

FIG. 1 is a front view of a polymer insulator of the present invention.

FIG. 2 is a sectional view taken along the line AA ′ of the polymer insulator of the present invention.

FIG. 3 is an explanatory diagram illustrating the effect of the polymer insulator of the present invention.

FIG. 4 is an explanatory diagram for explaining a conventional overhead transmission line retaining portion using an insulator.

FIG. 5 is an explanatory view for explaining a conventional overhead transmission line retaining section using an insulator.

DESCRIPTION OF SYMBOLS 10 Polymer insulator 12 Insulating outer shell 14 Grasping bracket 15 Body 16 Cap 17 Cap 20 Snow 41 Steel tower arm 43a Yoke plate 43b Yoke plate 44 Insulator 46 Overhead transmission line 47 Insulator link 51 Iron tower arm 54 Polymer insulator 56 Overhead transmission line 58 Rod

Claims (1)

[Claims] 1. A polymer insulator having an insulating core and an insulating jacket formed on the core, wherein a cross-sectional shape of the insulating shell is tapered in at least one direction. A polymer insulator characterized by having a different shape.