JP3259635B2 - How to prevent radio interference from high-voltage line equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing the occurrence of radio interference caused by local discharge in a charging section such as a high-voltage line facility, in particular, a connecting member, a retaining member, and a cotter pin of a tension insulator.

[0002]

2. Description of the Related Art Conventionally, there has been a problem of pulse disturbance due to distribution lines. This is due to the local discharge of the high-voltage line equipment, which impairs various telecommunications equipment such as reception of television broadcasts and reception of radio broadcasts.

[0003] The local discharge of the high-voltage line equipment is particularly caused by poor contact at a hot-dip galvanized connection portion of the high-voltage insulator or an insulator connection portion of the special high-voltage line, specifically, a connection portion between tension insulators. It is known that this is due to poor contact at the connection between the retaining clamp and the cotter pin, the connection between the cotter pin and the insulator connection hole, and the like. That is,
These connecting parts are usually protected by hot-dip galvanized film, but the high-voltage wire equipment is exposed to the atmosphere, so it is susceptible to the natural environment, and the surface of the hot-dip galvanized film can be protected in a long time. When an insulating layer is formed and the contact resistance between the connected components increases, for example, when the oxide layer is oxidized to form an insulating zinc oxide film, a pulse is generated to cause radio wave interference.

Conventionally, as a countermeasure against occurrence of a pulse or radio wave interference due to such a contact failure between connecting parts, for example, a tension insulator is replaced, a conductive sheet is wound around a connection portion, or a conductive sheet is wound. Spray the material,
Furthermore, methods such as providing lead wires made of metal have been adopted.However, the method of replacing the tension insulator requires extra costs, such as requiring a temporary cable to avoid a power failure,
The work is also troublesome. Also, the method using a conductive sheet,
In order to measure the adhesion with the connecting part, it is necessary to pre-treat the connecting part with sandpaper, and there is a large danger due to hot-line work, and the durability performance due to the adhesion between the connecting part and the conductive sheet The method of spraying a conductive material is also insufficient in durability. Furthermore, the method of providing a lead wire made of metal has problems such as poor workability.

[0005] The present invention has been made in view of the above circumstances,
An object of the present invention is to provide a method for preventing the occurrence of radio interference from high-voltage line equipment, which can easily and reliably prevent a pulse from being generated due to a contact failure at the above-described high-voltage insulator connection portion and the special high-voltage line connection. I do.

[0006]

Means for Solving the Problems and Embodiments of the Invention The present inventor has made intensive studies to achieve the above object, and as a result, the connecting portion of the high-voltage insulator and the connecting portion of the special high-voltage line have been changed to 25. By coating with a conductive silicone rubber composed of a cured product of a room temperature-curable (RTV) conductive silicone rubber composition having a viscosity of 100 centipoise to paste at 100 ° C., it is possible to generate a pulse based on poor contact of these connecting portions. It can be effectively prevented, and it is possible to reliably prevent radio wave interference to television reception, radio reception, and the like.Coating with this conductive silicone rubber can be achieved only by applying and injecting a conductive silicone rubber composition to the connection portion. As it can be performed, it has good workability, can be safely performed even in hot-line work, has excellent durability, and is used for a long time in cold climates etc. Also found that it is possible to sufficiently hold the conducting state of the connecting portion, in which the present invention has been accomplished.

Hereinafter, the present invention will be described in more detail. According to the method for preventing the occurrence of radio interference from high-voltage line equipment according to the present invention, a connecting portion of a high-voltage insulator or a connecting portion of an insulator of a special high-voltage line is covered with conductive silicone rubber. Thus, the electrical connection of the connecting portion is maintained.

Here, the connecting portion of the high-voltage insulator and the connecting portion of the insulator of the special high-voltage line include a connecting portion between the tension insulators and a connecting portion inside the clamp cover. As shown in the figure, a connecting portion (arrow) of the insulator 1 with the cotter pin 2 (arrow), a connecting portion of the insulator 1 and the strap 3 (arrow), a connecting portion of the strap 3 (arrow),
There are a connecting portion (arrow) between the insulator 1 and the retaining link 4, a connecting portion (arrow) between the retaining link 4 and the manual winding binding portion 5, and a connecting portion (arrow) between the insulator 1 and the retaining clamp 6. The connecting parts (connecting metal fittings) in the part are usually subjected to hot-dip galvanizing, and the connecting part formed by such a hot-dip galvanized film is sealed with conductive silicone rubber as described above. In the figure, reference numeral 7 denotes a clamp cover.

As the conductive silicone rubber for covering and sealing the connecting portion, a room temperature curing (RT)
The silicone rubber composition V) is preferable, and particularly, an acetone-type or alcohol-type condensation-type room-temperature-curable silicone rubber composition that does not generate a corrosive gas upon curing is preferably used.

This type of silicone rubber composition can be of a known composition, and has an organopolysiloxane having hydroxyl groups at both ends [HO (SiR ₂ O) _n H] (R is a methyl group, a phenyl group, a monovalent hydrocarbon group) a base polymer such as fluoropropyl group, (specifically, acetone type -O-C (CH ₃₎ organosilicon compound having at least three hydrolyzable groups in a molecule = CH Organosilicon compounds having three or more groups represented by ₂ , for example, CH
₃ Si [OC (CH ₃ ) = CH ₂ ] ₃ , and the alcohol type is an organosilicon compound having three or more alkoxy groups, for example, one using CH ₃ Si (OCH ₃ ) ₃ as a crosslinking agent. it can. In this case, a conductive material such as carbon black, silver powder, nickel powder, conductive zinc oxide, or conductive titanium oxide is blended with the silicone rubber composition in order to impart conductivity. The compounding amount is preferably such that the volume resistivity of the conductive silicone rubber is 10 ³ Ω · cm or less. The silicone rubber composition may contain a known condensation catalyst and other additives.

The viscosity of the silicone rubber composition is not particularly limited as long as it can be applied to the connecting portion by a method such as coating or pouring. From the viewpoint of workability, the viscosity of the silicone rubber composition is 100 centipoise to paste at 25 ° C., especially 1000 centipoise to 100 centipoise. It is preferably in the form of a paste.

In the method of the present invention, the connecting portion may be covered and sealed with a conductive silicone rubber composition and cured, but if it is curable at room temperature, it is cured simply by leaving it as it is, which is advantageous. is there. In addition, as a method of covering the above-mentioned connecting portion with a conductive silicone rubber composition and sealing it,
A method of applying using an applicator such as a spoon, a method of injecting with a caulking gun, a method of directly applying the conductive silicone rubber composition in a laminate tube, and the like can be adopted, but are not limited thereto. Not something.

The connection portion coated with the conductive silicone rubber eliminates poor electrical contact and secures a sufficient electrical connection. This eliminates the occurrence of a pulse due to the poor contact at the connection portion. The radio interference based on the noise is reliably eliminated and prevented. In this case, the silicone rubber has good weather resistance and heat resistance, has high mechanical strength, adheres well to the connecting portion, and has good followability to the connecting portion. It can protect and prevent pulse generation, and is very durable.

Accordingly, the method of the present invention is applied to a connection part where a contact failure has already occurred and a pulse has been generated to cause radio interference, thereby immediately eliminating the radio interference and removing the radio wave from this connection part for a long time. Can prevent the occurrence of radio interference from occurring, or by pre-coating the connecting part, which is liable to cause poor contact and possibly cause radio interference, with conductive silicone rubber, thereby preventing the occurrence of radio interference from this connecting part. It can be reliably prevented over a long period of time.

[0015]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to Examples, but the present invention is not limited to the following Examples.

[Example 1] A contact failure occurred at a connection portion (indicated by an arrow in FIG. 2) between an insulator and a retaining clamp 11 years after construction, and radio interference such as television reception occurred due to this.

An acetone-type condensed room-temperature-curable conductive silicone rubber composition (KE3491 manufactured by Shin-Etsu Chemical Co., Ltd., paste at 25 ° C.) is injected into the joint using a caulking gun. Coated. This was cured as it was, and the cured product had a volume resistivity of 500 Ω · cm.

By this measure, the radio interference disappears immediately, and no radio interference occurs even after one year.

[Embodiment 2] A contact failure occurred at a connection portion (arrow portion in FIG. 1) of the cotter pin between insulators eight years after construction, and radio interference such as television reception occurred due to the poor contact.

The condensed room temperature curable conductive silicone rubber composition (KE3492, manufactured by Shin-Etsu Chemical Co., Ltd., paste at 25 ° C.) at 25 ° C. is applied to the connection using a plastic spoon. Was coated. It was cured as it was, and the cured product had a volume resistivity of 1 × 10 ^-2 cm.

By this measure, the radio interference disappears immediately, and no radio interference has occurred even after one year has passed.

[0022]

According to the present invention, it is possible to eliminate the generation of pulses due to poor electrical contact at the connecting portion of the high-voltage insulator and the connecting portion of the insulator of the special high-voltage line, and to prevent the occurrence of radio interference for a long period of time. Further, the work is simple, and there is little danger even when hot-line work is performed. Therefore, the method is very effective as a measure against radio interference.

[Brief description of the drawings]

FIG. 1 is a side view illustrating a connecting portion of a high-pressure insulator by a retaining binding method.

FIG. 2 is a partial cross-sectional side view illustrating a connecting portion of a high-pressure insulator by a retaining clamp method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulator 2 Cotter pin 3 Strap 4 Retaining link 5 Manual winding binding part 6 Retaining clamp 7 Clamp cover

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02G 7/00 H02G 1/02 H05K 9/00

Claims (1)

(57) [Claims] 1. A condensed type room temperature curable conductive silicone rubber of an acetone type or an alcohol type having a viscosity of 100 centipoise or paste at 25 ° C. of 100 centipoise or paste. A method for preventing the occurrence of radio interference from high-voltage line equipment, characterized in that the connection part is covered with a conductive silicone rubber made of a cured product of the composition to maintain electrical contact.