JP2912337B1 - Salt-resistant insulator - Google Patents

Abstract

An object of the present invention is to provide an excellent salt-resistant property, prevent an arc from being blown into a fold even when a flashover occurs, prevent tracking of a shield plate when an insulator is contaminated, and reduce the size of an insulating cover. To provide a salt-resistant insulator capable of achieving the following. A flexible shielding plate for covering a front surface of an opening of a fold of an insulator main body is attached to a cap fitting. The shielding plate 6 prevents dust from entering the pleats 3 and regulates the arc generating position of the cap fitting 4. The shielding plate 6 has an insulating portion 7 at its outer peripheral portion and a semiconductive portion 8 at its inner peripheral portion to expose the surface of the semiconductive portion 8 so as to be in contact with or close to the trunk portion 2 of the insulator main body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a salt-resistant insulator used in a salt-affected area such as a coastal area.

[0002]

2. Description of the Related Art In a salt-resistant insulator, a deep fold is formed in an insulator main body to secure a large surface leakage distance, and a salt-reducing performance is improved by forming a portion that suppresses contamination and wetting inside the fold. Things. However, when dust or the like enters the folds, the salt resistance is reduced. Therefore, for example, as disclosed in Japanese Utility Model Application Laid-Open No. 6-70125, a flexible shielding plate is attached to the cap metal of the insulator to suppress intrusion of dust and the like from the front surface of the opening of the pleat.

[0003] Further, when an arc from the cap member of the insulator blows into the fold when flashover occurs due to a lightning surge, the insulator body may be damaged. By covering the end on the insulator main body side, the arc generating position of the cap fitting is regulated, and the function of preventing the arc from being blown into the inside of the fold is achieved.

Heretofore, this shielding plate has been entirely formed of insulating rubber. However, when the insulator becomes dirty and wet, leakage current from the cap fitting flows on the surface of the insulating shielding plate, causing tracking due to local discharge, burning the rubber, and possibly causing insulation deterioration. Therefore, it has been considered to form a shielding plate of semiconductive rubber and prevent the local discharge by flowing the leakage current from the cap metal to the insulator body via the semiconductive rubber. Since the entire plate is a power application section, there is a problem that the insulating cover covering the entire outside thereof becomes very large, and the mounting work becomes troublesome.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional problems, has excellent salt resistance, and does not blow an arc into the pleat even when flashover occurs due to a lightning surge. An object of the present invention is to provide a salt-resistant insulator which does not cause burning of a shielding plate due to tracking and can reduce the size of an insulating cover for covering a power receiving portion.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a method for mounting a flexible shielding plate, which is located in front of an opening of a fold of an insulator body, on a cap metal fitting of the insulator. In a salt-resistant insulator in which an arc generating position of a metal fitting is regulated, the shielding plate has an outer peripheral part as an insulating part and an inner peripheral part in contact with the cap fitting as a semiconductive part, and a surface of the semiconductive part. The insulator is exposed so as to be in contact with or close to the body of the insulator main body.

In the present invention, the inner peripheral portion of the shield plate which comes into contact with the cap fitting as described above is a semiconductive portion, and the surface of the semiconductive portion is exposed so as to contact or approach the body of the insulator body. This eliminates the risk of burnout of the shielding plate due to tracking, and also makes the outer peripheral portion of the shielding plate an insulating portion so that the power application portion is limited to the inner peripheral portion of the shielding plate, and the insulating cover that covers the power applying portion is downsized. Can be achieved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. FIG. 1 is a cross-sectional view showing a first embodiment of the present invention, and FIG. In FIG. 1, reference numeral 1 denotes an insulator main body made of porcelain, and a deep pleat 3 for improving salt resistance is formed on an outer periphery of a body portion 2 of the insulator main body. Reference numeral 4 denotes a cap, which is a body 2 of the insulator body 1.
Is fixed by cement 5 to the end.

A flexible disk-shaped shielding plate 6 is attached to the cap fitting 4 so as to be located in front of the opening of the fold 3 of the insulator body 1. In the present invention, the outer peripheral portion of the shielding plate 6 is an insulating portion 7, and the inner peripheral portion in contact with the cap fitting 4 is a semiconductive portion 8. Such a shield plate 6 can be integrally manufactured as a whole by forming an inner peripheral portion of, for example, ethylene propylene rubber having semiconductivity and applying an insulating coating to the outer peripheral portion. As shown in FIG. 1, the surface of the semiconductive portion 8 of the shielding plate 6 is formed so as to cover the tip of the cap fitting 4 so as to prevent arcing at this location and to prevent the body 2 of the insulator main body 1 from forming.
It is exposed so as to be in contact with or close to.

[0010] The salt-resistant insulator thus configured is shown in FIG.
As shown in the figure, the cap metal 9 on the upper end side is attached to the arm 11 of the utility pole by the connector 10, and the clamp metal 14 is attached by driving the connecting pin 13 into the connecting hole 12 of the lower cap metal 4, This clamp bracket 14
To support the wire conductor 15. Then, split-type insulating covers 16 and 17 are attached to the outside of the clamp fitting 14 and the cap fitting 4 as the power application unit.

As shown in FIG. 2, the shielding plate 6 covers the front surface of the opening of the fold 3 so that dust and the like can be prevented from entering the inside of the fold 3 from the front surface of the opening. When a lightning surge is received, flashover occurs from the joint of the split insulating cover 17 and the like, and a subsequent arc is formed between the power-applying cap metal fitting 4 and the ground-side cap metal fitting 9. As shown in FIG. 1, the opening edge of the cap fitting 4 is covered with a shielding plate 6 that does not arc, and the arc generating position of the cap fitting 4 can be restricted to a lower part that is not covered by the shielding plate 6. As shown by the broken line in FIG. 2, the path of the arc is detoured to the outside of the shielding plate 6, so that the arc can be prevented from being blown into the inside of the pleat 3.

The above operation and effect are the same as those of the conventional product,
According to the present invention, the following two operational effects not obtained in the conventional product can be obtained. First, in the present invention, the inner peripheral portion of the shielding plate 6 is
The surface is exposed so as to be in contact with or close to the body 2 of the insulator main body 1. Therefore, even when the insulator is soiled and wet and a leak current flows from the cap fitting 4, the leak current is transmitted through the semiconductive portion 8. It flows into the insulator body 1. Therefore, it is possible to prevent tracking due to local discharge on the surface of the shielding plate 6 as in the conventional product. Second, in the present invention, since the outer peripheral portion of the shielding plate 6 is the insulating portion 7, only the inner peripheral portion of the shielding plate becomes the power application portion. For this reason, as shown in FIG. 2, the insulating cover 17 does not need to cover the entire shielding plate 6, and the insulating cover 17 can be reduced in size.

Although the entire shielding plate 6 may come off the cap fitting 4 as shown in FIG. 3 due to the pressure of the arc, since the shielding plate 6 is flexible, it is curved as shown in FIG. It is possible to reliably prevent the arc from being blown into the inside of the folds 3 and prevent the insulator body 1 from being damaged.

FIG. 4 is a sectional view showing a second embodiment of the present invention. In the second embodiment, a projecting portion 18 is provided on the back side of the shielding plate 6 so that the opening of the insulating cover 17 that covers the power application portion can be locked by the projecting portion 18. With such a structure, it is possible to prevent dust from entering the inside of the insulating cover 17 and prevent the inside of the insulating cover 17 from being stained. If the projection 18 is provided on the back side of the shielding plate 6, the arc pressure is also received by the projection 18, and the pressure receiving area is increased. Therefore, as shown in FIG. 3, the shield plate 6 is easily detached, and the insulator main body 1 can be more reliably prevented from being damaged.

[0015]

As described above, the salt-resistant insulator according to the present invention is excellent in salt-proof performance like the conventional product, and the arc is blown into the fold even when flashover occurs due to a lightning surge. Therefore, it is possible to prevent the insulator body from being damaged. In addition, the salt-resistant insulator of the present invention can improve the durability by improving the shielding plate to prevent tracking in a facility state in a salt-affected area, and to reduce the size of the insulating cover that covers the power application section. There are advantages.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a use state.

FIG. 3 is a cross-sectional view showing a state where a shielding plate is detached.

FIG. 4 is a sectional view showing a second embodiment of the present invention.

[Explanation of symbols]

1 insulator body, 2 trunks, 3 folds, 4 cap fittings,
5 cement, 6 shielding plate, 7 insulating part, 8 semi-conductive part, 9 cap fitting, 10 connecting tool, 11 power pole arm,
12 Connection hole, 13 Connection pin, 14 Clamp bracket, 15 Wire conductor, 16 Insulation cover, 17 Insulation cover, 18 Projection

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kaoru Araki 1-3-1 Uchisaiwaicho, Chiyoda-ku, Tokyo Tokyo Electric Power Company (72) Inventor Masahiro Okamura 1-1-10 Jinnan, Shibuya-ku, Tokyo Tokyo Electric Power Company Tokyo Minami Branch (72) Inventor Akira Oyama 3-3-1-18 Ginza, Chuo-ku, Tokyo Tokyo Electric Power Company Ginza Branch (72) Inventor Hiroe Aida 1-1-5 Kiba, Koto-ku, Tokyo Shares (72) Inventor Hiroshi Ogasawara, 1-11-1 Shinjuku, Shinjuku-ku, Tokyo Nasu Electric Works Co., Ltd. (72) Inventor Koichi Suzuki 1-11-1 Shinjuku, Shinjuku-ku, Tokyo Nasu Electric Works Co., Ltd. In-company (72) Inventor Kiyoshi Hasegawa 2-56 Suda-cho, Mizuho-ku, Nagoya-shi, Aichi Japan Inside Insulator Co., Ltd. (72) Inventor Yoshinobu Noda Nagoya, Aichi-ken 2-56, Suda-machi, Ho-ku, Japan Insulators Co., Ltd. (72) Inventor Tetsuya Asukai 2-56, Suda-cho, Mizuho-ku, Nagoya-shi, Aichi Japan Insulators Co., Ltd. (56) References , U) Actual opening 60-53117 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01B 17/00-17/54

Claims (2)

(57) [Claims] 1. A salt-resistant insulator in which a flexible shielding plate positioned in front of an opening of a fold of an insulator main body is attached to a cap metal of the insulator so as to regulate an arc generating position of the cap metal. The plate is characterized in that the outer peripheral part is an insulating part and the inner peripheral part in contact with the cap fitting is a semiconductive part, and the surface of this semiconductive part is exposed so as to contact or approach the body of the insulator body. Salt resistant insulator. 2. The salt-resistant insulator according to claim 1, wherein a projection is provided on a rear side of the shielding plate for locking an insulating cover that covers the power application unit.