JPH077612B2 - Suspension insulator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a suspension insulator used for supporting a power transmission line on a support arm of a steel tower in a power transmission and distribution line, for example.

[Prior Art] As a conventional suspension insulator, as shown in FIG.
The cap metal fitting 5 is fitted to the head 3 integrally formed in the central portion of the upper surface of the cap portion 2 and fixed by the cement 6, and the upper portion of the pin metal fitting 7 is fitted inside the head 3 to cement the head. It is fixed by 6. A pleated portion 4 is integrally formed on the back surface of the cap portion 2 in a concentric manner.

[Problems to be Solved by the Invention] When the connection length of the suspension insulator is H and the creepage insulation distance of the insulator body 1 is L, the suspension insulator described above is set to L / H = 2. That is, the aforementioned connection length H
Since it is set to a predetermined length according to the JIS standard according to the transmission voltage, the creepage insulation distance L cannot be long, and therefore it cannot be said to be a desirable suspension insulator in terms of insulation strength.

Further, in order to eliminate the above-mentioned defects of the suspended insulator, there has been proposed a fog-resistant insulator in which the height h of the folds 4 is increased as shown in FIG.

However, although this suspension insulator can secure a long creepage insulation distance L (L / H = 3), when it is used in a desert area, sand is likely to adhere to the bottom surface between the high folds 4 and the fold There is a problem that it is difficult to clean the contaminants between the parts 4.

Further, as a conventional suspension insulator, as shown in FIG. 5, an aero-type suspension insulator has been devised in which the folds 4 are omitted.
This has the advantage that sand does not accumulate, but in order to obtain a long creepage insulation distance L, the diameter of the cap portion 2 must be extremely large, which makes the suspension insulator large and heavy. There was a problem.

An object of the present invention is to solve the problems existing in the above-mentioned suspension insulators, to prevent dirt such as sand from accumulating between the folds on the back surface of the shade portion, and to easily wash the dirt, and An object of the present invention is to provide a suspension insulator capable of ensuring a long creepage insulation distance as compared with the diameter of the portion.

[Means for Solving the Problems] In order to achieve the above object, the present invention has a plurality of folds formed concentrically on the back surface of a cap portion of an insulator body, having a height h, a gap l between the fold portions, and a cap portion. Between the creepage insulation distance L, the diameter D of the cap portion, and the connecting length H of the suspension insulator, 0.8h <l ... 2.5 ≦ L / H ≦ 4.5 ... D ≦ L ... Is set.

[Operation] According to the present invention, it is possible to increase the creepage insulation distance of the cap portion without increasing the diameter of the cap portion and to easily clean the contaminants between the folds.

Embodiment An embodiment embodying the present invention will be described below with reference to FIGS. 1 and 2.
It will be described with reference to the drawings.

The suspension insulator of the present invention shown in FIG. 1 has the same basic structure as that of the conventional suspension insulator shown in FIG. 3, but the zinc sleeve 8 is provided on the outer peripheral surface of the pin fitting 7 of the suspension insulator of the present invention.
Is formed so as to prevent electrolytic corrosion of the pin fitting 7, and the dimensions and settings of the respective parts that are the essential parts of the present invention are different. Therefore, next, the dimension setting of each part will be described.

First, the diameter of the cap portion 2 of the suspension insulator is D, the height of the cap portion 2 is A,
The height h of the folds 4, the distance between the folds 4 is 1, the creepage insulation distance of the insulator body 2 (the distance from the cap fitting 5 to the pin fitting 7) is L, and as shown in FIG. When the connection length is H, in the present invention, the dimensions of the respective parts are set so as to satisfy the following conditions.

0.8 × h <l ... 2.5 ≦ L / H ≦ 4.5 ... D ≦ L ... Due to the relationship of the equations set above, the height of the gap between the folds 4 becomes small, so that the suspended insulator can be used in the desert area. When used, dust that has entered the voids is unlikely to be deposited on the bottom, and even if some dust is deposited, it can be easily washed.

In addition, as shown in the above formula, the creepage insulation distance L of the insulator body 1
Since the number of insulators is increased, the number of insulators can be reduced as compared with the number of insulators when aero-type conventional suspension insulators are connected, and the tower design can be miniaturized.

Further, as shown in FIG. 2, the space B between the cap portions 2 can be made longer than that of the conventional fog-insulator, and as a result, flashover between the cap portions 2 can be prevented.

Here, as a result of comparing the performances of the insulator of the present invention and three types of existing insulators, the results are shown in Tables 1 and 2. Table 1 shows the difference in insulator length when the creepage insulation distance L is 4600 mm and the mechanical strength is 120 KN.

As is clear from Table 1, the insulator of the present invention can reduce the required number of connections as compared with existing insulators.

Table 2 shows the characteristics of the same insulator length, that is, when 10 pieces are connected.

The values in parentheses indicate the% of various characteristics of each insulator when the conventional suspension insulator is 100.

As is clear from Table 2, the present invention can increase the creepage insulation distance without reducing the lightning impulse flashover voltage and the water injection withstand voltage.

[Effects of the Invention] As described in detail above, the present invention can prevent dust from accumulating on the back surface of the cap portion even when used in a polluted area such as a desert, and can also prevent stains between folds. There is an effect that the object can be easily washed and the creepage insulation distance of the cap portion can be secured without increasing the diameter of the cap portion.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway front view showing an embodiment of a suspension insulator embodying the present invention, and FIG. 2 is a partially cutaway front view showing a connected state of the suspension insulator. 5 to 5 are partially cutaway front views showing a conventional suspension insulator. DESCRIPTION OF SYMBOLS 1 ... Insulator main body, 2 ... Shade part, 4 ... Ridge part, 5 ... Cap metal fittings, 7 ... Pin metal fittings, H ... Insulator connection length, L ... Creepage insulation distance, D ... Shade part diameter, l ... Ridge space , H ... height of folds, A ... height of caps, B ... distance between caps.

Claims (1)

[Claims] 1. A height (h) of a plurality of folds (4) formed concentrically on the back surface of a cap portion (2) of an insulator body (1), an interval (l) between the folds (4), 0.8h <l… 2.5 ≦ L / H ≦ 4.5… D between the creepage insulation distance (L) of the cap (2), the diameter (D) of the cap (2), and the connecting length (H) of the suspension insulator. <= L ... Suspension insulator characterized in that the dimensions of the respective parts are set so as to satisfy the above items.