JPH077614B2 - Arrester cap - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved structure of an arrester cap attached to a power distribution arrester which is a lightning protection device for equipment such as a transformer installed on a utility pole.

[0002]

2. Description of the Prior Art This type of arrester cap is generally
An outlet for a high-voltage pull-down wire is provided at the top of the cap body having a bell-shaped outer shape and a hollow interior, and the lower inner part of the cap body is fitted and held in the insulator portion of the arrester. There is.

[0003]

However, the outer diameter of the insulator portion of the arrester varies depending on the manufacturing company, the electric power company to be used, and the like. Therefore, it is necessary to align the arrester caps having a size that matches the outer diameter of the insulator portion, resulting in high cost, and there is a problem that the workability of the mounting work is reduced because these are selected and used. Therefore, it is an object of the present invention to provide an improved arrester cap that can overcome all of these problems.

[0004]

SUMMARY OF THE INVENTION An arrester cap of the present invention includes an insulator having different diameters, in which insulator portions of arresters having different diameters can be inserted and inserted in the lower longitudinal direction of the inner wall of the cap body. A plurality of parts are provided at equal intervals, a drainage groove is formed in the middle of these insulator holding parts, and a horizontal groove is provided under the outer wall of the cap body so as to correspond to the boundary position of each step. To form a thin portion that is easy to cut.

[0005]

[Function] The diameter of the multi-stage insulator holding portion, which is formed with different diameters by connecting the steps in the lower vertical direction of the inner side wall of the cap body, is selected, and the insulator portion having a diameter matching the diameter of the insulator portion of the arrester is selected. And hold it, and cut the hem of the cap body with a thin part corresponding to the insulator holding part of the selected diameter of the cap body to separate the lower end of the cap body from the insulator part of the arrester. Let it take. Further, the rainwater that has entered the cap body through the gap between the extraction hole and the high-voltage pulling wire during use is discharged to the outside from the drain groove provided in the cap body.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1 and FIG. 2, reference numeral 1 denotes a cap body of an arrester cap having a bell-shaped outer shape and a hollow interior, and a cylinder is provided with a lead-out hole 2 for a high-voltage pulling wire at the top of the cap body 1. It is formed by performing.
Then, the build-up portions 3 are provided at equal intervals in the lower vertical direction of the inner side wall of the cap body 1, and steps 4a to 4c having a concave cross-section are continuously provided on the surface of each of the build-up portions 3 in an insulator. The sandwiching portions 5a to 5c are formed. Each of these insulator holding portions 5a to 5
In c, the insulator holding portion 5a surrounded by the uppermost step 4a has the smallest diameter, the insulator holding portion 5b surrounded by the middle step 4b has an intermediate diameter, and the insulator holding portion 5 surrounded by the lowermost step 4c.
The diameters of c are different from each other so that c has the maximum diameter. In addition,
In the embodiment, the steps 4a to 4c are continuously arranged in three steps on each of the built-up portions 3 to form the three insulator holding portions 5a to 5c having different diameters. However, by providing the steps in multiple stages, the insulator holding is performed. The parts can be formed in multiple stages.

Further, drainage grooves 6 and 6 are formed in the lower longitudinal direction of the inner wall of the cap body 1. These drainage grooves 6,
6 is formed by bulging the wall surface of the cap body 1 outward in a circular arc shape in the middle of the built-up portion 3.

Furthermore, at the lower part of the outer wall of the cap body 1, the boundaries between the steps 4a and 4b and the steps 4b and 4 are formed.
By forming a horizontal groove at a position corresponding to the boundary with c, thin portions 7, 7 that can be easily cut are formed.

Next, the use of the thus formed arrester cap of the present invention will be described. In FIG. 3, reference numerals 8 and 8 denote pole transformers that are supported and fixed to the arms 10 and 10 that are laid horizontally on the pole 9. Reference numeral 11 is an arrester mounted directly on the pole transformers 8 and 8 by a high-voltage direct fitting 12 mounted on a utility pole 9, and a high-voltage pulling wire 13 is pulled out from the top of the arrester 11. The high voltage pulling wire 13 is connected to a high voltage pin insulator 14. Also, the arrester 11
And the ground wires 15 and 15 are connected to the pole transformers 8 and 8, respectively.

Then, after pulling out the high-voltage pulling-down electric wire 13 connected to the high-voltage pin insulator 14 from the pull-out hole 2, the cap body 1 is put on the insulator portion 16 of the arrester 11 so as to match the diameter of the insulator portion 16. The insulator holding portions 5a to 5c are selected and fitted and held tightly. At this time, for example, when the uppermost insulator holding portion 5a is fitted into the insulator portion 16 as shown in FIG. 4, the hem portion of the cap body 1 is cut and removed by the upper thin portion 7 shown by the chain line. The lower end of the cap body 1 and the insulator portion 16 are separated from each other.

In use, even if rainwater enters the cap body 1 through the gap between the drawing hole 2 provided at the top of the cap body 1 and the high-voltage pulling wire 13, it is discharged from the drainage grooves 6 and 6. Since there is no dew condensation in the cap body 1, no electric leakage occurs.

[0012]

As described above, the arrester cap of the present invention can be used for those having different diameters of the insulator portion of the arrester, and therefore, those of all sizes that match the insulator portion as in the prior art. It is economical because there is no need to arrange the same, and the workability of mounting on the arrester can be improved. Further, even if rainwater enters through the extraction hole of the high-voltage pulling-down wire during use, it is discharged through the drainage groove, so that an accident such as a leak does not occur, and the function of the arrester can be fully exerted.

[Brief description of drawings]

FIG. 1 is a perspective view of an arrester cap.

FIG. 2 is a vertical cross-sectional view of FIG.

FIG. 3 is a front view showing a usage state.

FIG. 4 is a partially enlarged sectional view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cap main body 2 Drawing hole 4a-4c Step 5a-5c Insulator holding part 6,6 Water drain groove 7,7 Thin part 11 Arrester 13 High-voltage pull-down electric wire 16 Insulator part

Claims (1)

[Claims] 1. An outlet for a high-voltage pulling-down wire is provided at the top of a cap body having a bell-shaped outer shape and a hollow interior, and an inner lower portion of the cap body is fitted into an insulator portion of an arrester. In the arrester cap to be retained, a plurality of different-diameter insulator holding portions are provided at equal intervals in which stepped portions are continuously arranged so that insulator portions of different diameters can be inserted and inserted in the lower longitudinal direction of the inner wall of the cap body. A drainage groove is formed in the middle of the insulator sandwiching portion, and a horizontal groove is formed around the lower part of the outer wall of the cap body so as to correspond to the boundary position of each step, to form a thin portion that is easy to cut. Arrester cap.