JP3389557B2 - Method for preventing continuation flow in the detention part and the lead-in part of high-voltage overhead distribution lines - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION When a lightning overvoltage enters a high-voltage overhead distribution line or power equipment, a flashover occurs, which may cause a power failure or damage to equipment due to a short circuit due to an alternating current. The present invention relates to prevention of an AC follow-up current caused by a flashover when a lightning overvoltage enters, and more particularly to a lightning protection method that does not use a characteristic element.

[0002]

2. Description of the Related Art Conventionally, when a lightning overvoltage intrudes into both detention sections where a high voltage overhead distribution line is detained, a flashover path (hereinafter referred to as "flashover path") caused by the lightning overvoltage is As shown in FIG. 6, there are three routes A, B, and C. The route A is a flashover from the fixing metal fitting 4a of the high-pressure solid insulator 4 to the binding wire 9 and the beveling wire 3 to the detention clamp metal fitting 6. The route and route B are caused by the dielectric breakdown of the electric wire in the vicinity of the bind wire 9, and are flashover paths from the fixing metal fitting 4a of the high-voltage solid insulator 4 to the core wire of the electric wire 3 via the bind wire 9 and the rim. , C route is a flashover route from the arm 7 to the retaining clamp metal fitting 6 via the creeping surface of the retaining tension insulator 5.
If a flashover occurs at the time of lightning overvoltage intrusion in any of these three paths, and a flashover occurs in more than two phases, a continuous current due to an alternating current may cause damage to the tensioning insulator 5 for detention, disconnection of the rim line 3, etc. There is a fear. In order to prevent the occurrence of flashover and follow-up current, a method such as installing a lightning protection device or a discharge clamp insulator at the relevant place was adopted.

[0003]

However, these devices and the like are expensive, and at the time of installation, it takes time and effort to attach and replace them.

Therefore, the present invention provides an inexpensive method for preventing continuous current in the detention section and the passing section of a high-voltage overhead distribution line, which does not require a lightning protection device or a discharge clamp insulator, and has a simple structure that does not use characteristic elements. Then, the above problems are solved.

[0005]

According to a first aspect of the present invention, in the towing portion and the pulling portion having the edging wire for laying down the high voltage overhead distribution line, the edging line or the high voltage overhead distribution line is covered. , A cover having an inner wall surface made of an insulating material is attached, and when the cover is attached, there is a slit space portion in the longitudinal direction between the rim-surrounding wire or high-voltage overhead distribution line and the inner wall surface of the cover. When there is a lightning overvoltage intruding into the pulling part or the pulling part, the flashover that travels on the edging wire or the high voltage overhead distribution line is passed through the slit space part in the coating body to break the short circuit path. A method for preventing a follow-up current in the detention section and the passing section of the high-voltage overhead distribution line was adopted to prevent a follow-up current by reducing the area.

According to a second aspect of the present invention, in a towing section having a edging wire and a high voltage solid insulator for laying down a high voltage overhead distribution line, an exposed charging section is provided on the edging wire and the exposed charging section is provided. The inner wall surface that covers both of the wire-fixing bind wire tips on the high-voltage solid insulator is attached with a cover made of an insulating material, and when the cover is attached, the rim-turning wire and the bind wire tip are covered. It is assumed that there is a slit space portion in the longitudinal direction between the inner wall surface of the body, and when there is a lightning overvoltage intruding into the towing portion, the above-mentioned wire fixing bind wire and the flashover that goes over the wire around the edge, A continuous flow preventing method is provided in the detention section and the drawing section of the high-voltage overhead distribution line, in which the continuous flow is prevented by passing through the slit space in the coating body and reducing the cross-sectional area of the short-circuit path.

According to a third aspect of the present invention, an insulating material composed of a large number of particles is provided on the inner wall surface of the coating, and when a flashover occurs due to the intrusion of a lightning overvoltage, the flashover is passed between the particles. The above claim 1 or claim 2
This is a method for preventing continuous current in the detention section and the drawing section of the high voltage overhead distribution line.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described with reference to FIGS. The covering 1 in the first embodiment is made of ethylene / propylene rubber or the like, which is an insulating material having excellent weather resistance, and its shape is a thin, elastic tubular shape having specified insulation. Therefore, when it is actually attached to the rimmed wire to be described later, a slit space portion 1a is formed in the longitudinal direction between the inner wall surface of the cover 1 and the outer circumference of the rimmed wire. . Further, both ends 1b of the cover 1 are tapered so that they can be stably attached so as to prevent water from entering when they are attached to the edging wire.

1 and 3 show a method of attaching the cover 1 to the rim-turning wires 3 of the two detention sections 2 where the high-voltage overhead distribution line is detained and preventing a follow-up current when a lightning overvoltage enters. It will be described based on. The two detention sections 2 where the high-voltage overhead distribution line is detained are the edging wire 3, the high-voltage solid insulator 4, the detention tension insulator 5, the detention clamp metal fitting 6, and the arm 7 for supporting both detention sections 2 as a whole. Consists of bind lines 9. Coating 1
It is attached to the outer periphery of the edging wire 3 near the high-pressure solid insulator 4 located at the left side and the center of the two detention sections 2.

Prior to the installation, at the mounting location on the rimmed wire 3, a part of the rimmed wire 3 is stripped of the insulating coating to provide an exposed charging section 8 so that lightning overvoltage may enter both the detention sections 2. When the flashover occurs, the high pressure solid insulator 4 from the fixing bracket 4a of the solid insulator 4 to the bind wire 9 (A1 route)
And the exposed charging portion 8 (A2 route) provided on the electric wire 3 around the edge 9a of the bind wire 9 to coordinate the flashover characteristics with the other two routes of B route and C route. The flashover is generated only on the wire 3 around the edge on the route A. When the cover 1 is attached, the tip 9a of the bind wire 9 wound around the outer periphery of the left-hand edge wire 3 and the exposed charging portion 8 are covered and attached.

When lightning overvoltage enters both of the detention sections 2 with the cover 1 attached, the fixing metal fitting 4 of the high-voltage solid insulator 4
A flashover (A2 path) occurs from a through the bind wire 9, from the tip 9a to the edge, through the surface of the electric wire 3 and to the exposed charging portion 8. However, at the above position, the cover 1
Since the flashover generated is passed through the slit space portion 1a in the covering body 1, it is confined in the slit space portion 1a, which is caused by the flashover which causes a continuous flow. The ionization can be eliminated by utilizing the phenomenon that the cross-sectional area of the short-circuit path is narrowed on the inner wall surface 1c of the insulating material, and a rapid insulation recovery can be achieved to achieve a continuous flow.

Further, as a covering body of another embodiment of the present invention, an insulating sheet may be wound around an electric wire or the like around the edge (not shown) instead of the tubular shape (not shown). in this case,
In order to secure the slit space portion, convex portions are provided inside the insulating sheet at intervals. Further, as shown in FIG. 4, by providing insulating particles such as silica sand 10 on the inner wall surface of the cover 1 to increase the surface area in the slit space 1a, the elimination of the plasma state is further promoted.

Next, Table 1 shows an experimental example of the relationship between the presence or absence of the covering body 1 and the occurrence of the follow current.

[Table 1] The above X indicates that there is a follow current, and the above O indicates that there is no follow current.

As described above, when the cover 1 is not attached,
Continued flow occurs even if the A2 flashover path is 100 cm. This is A2 when a flashover occurs.
This is because ionization occurs in the path of, and this plasma state continues for a certain time. On the other hand, when the cover 1 is attached,
Even if the flashover path of A2 is set to 25 cm, the follow current does not occur. This is A2 when a flashover occurs.
This is because ionization occurs in the path of 1 and a plasma state is reached, but this is eliminated in a short time. Whether or not a follow-up current is generated is determined by the rate of elimination of this plasma state. Also, the elimination rate of the plasma state (ionization) depends on the size of the inner wall surface 1c of the slit space portion 1a made of an insulating material. The effect is proven. Furthermore, when the surface area of the inner wall surface 1c is increased, the cooling effect is also increased, and the elimination of the plasma state is further promoted.

Further, FIG. 5 shows another method in which the flashover path at the time of lightning overvoltage intrusion is limited to the above-mentioned path A, but the bind wire 9 wound around the edge turning wire 3 is used. Of the binding wire 9 in the wire 3
The covering 1 is attached from the position of the tip 9a to the end of the clamp metal fitting 6 by covering the end 9a and the end of the clamp metal fitting 6.

In the above embodiment, only the case where the covering 1 is provided in the detention section of the high-voltage overhead distribution line has been described, but an exposed charging section is provided on the wire of the pull-in section for retracting the high-voltage overhead distribution line. In some cases, the covering 1 may be provided so as to cover it. Furthermore, although the cylindrical shape or the one in which the insulating sheet is wound is described as the covering body 1, the shape of the covering body 1 is not limited to these. Also, both detention units 2
A concrete method for enabling a flashover route (route A) in the rim-surrounding wire 3 when a lightning overvoltage intrudes into the rim-surrounding wire 3 is described. However, the method for enabling the above is not limited to these. Further, ethylene / propylene rubber having excellent weather resistance is used as the insulating material forming the cover 1, but the insulating material forming the cover 1 is not limited to this, and at least the inner wall surface 1c is insulated. Any material may be used as long as it is made of material. Also, the cover 1
Although it is partially attached on the wire 3 around the edge, the covering body 1 may be configured to be attached over the entire wire 3 around the edge, and is applicable not only to both the anchoring points but also to all the anchoring portions. it can.

[0017]

According to the inventions of claims 1 and 2,
As a measure against lightning in the detention section of high-voltage overhead distribution lines, for example, to prevent fusing of insulated wires due to subsequent flow and damage to the tension insulators, conventional lightning protection devices and discharge clamp insulators are not required. ZnO used for prevention
Since a characteristic element such as an element is not required, an extremely inexpensive and highly versatile lightning protection device can be provided. Further, according to the invention of claim 3, since the insulating material composed of a large number of particles is provided on the inner wall surface of the coating body to allow the flashover to pass between the particles, the surface area of the slit space in the coating body is increased. The elimination of the plasma state is further promoted, and it becomes more effective by preventing the follow current.

[Brief description of drawings]

FIG. 1 is an explanatory view of a state in which a cover is attached to the rim-wound electric wires of both the detention units according to the embodiment of the present invention.

FIG. 2 is an enlarged vertical cross-sectional view of the covering body according to the embodiment of the present invention.

FIG. 3 is an explanatory view showing a state in which a covering body is attached to the rim-wound electric wires of both the detention units according to the embodiment of the present invention, and is a partially enlarged view of FIG.

FIG. 4 is another embodiment of the present invention, and is an explanatory view of a state in which insulating particles such as silica sand are provided and attached to the inner wall surface of the covering body.

FIG. 5 is an explanatory diagram showing a state in which a cover is attached so that the flashover path is limited to the A path by another method in the embodiment of the present invention.

FIG. 6 is an explanatory diagram showing three flashover paths that are generated when a lightning overvoltage enters both of the detention sections where the high-voltage overhead distribution line is detained.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cover 2 Both detention sections 3 Edge turning electric wire 4 High-voltage solid insulator 5 Tensile insulator for detention 10 Quartz sand

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Jun Yoshinaga 1-3-3 Uchisaiwaicho, Chiyoda-ku, Tokyo Tokyo Electric Power Company (72) Inventor Satoru Koizumi 1-3-1 Uchiyuki-cho, Chiyoda-ku, Tokyo TEPCO Co., Ltd. (56) Bibliography Showa 62-120216 (JP, U) Showahei 4-29122 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02G 7/00

Claims (3)

(57) [Claims] 1. A covering body having an inner wall surface made of an insulating material, which covers the edging wire or the high voltage overhead distribution wire, in a towing section and a pulling section having an edging wire for retracting the high voltage overhead distribution wire. When installing, when the covering is attached, there shall be a slit space part in the longitudinal direction between the edging wire or high-voltage overhead distribution line and the inner wall surface of the covering, and the detention part or the passing part is thundered. When an overvoltage is intruded, the follow-up current is prevented by passing the flashover that travels on the above-mentioned edging wire or high voltage overhead distribution line through the narrow space part in the above-mentioned sheath to reduce the cross-sectional area of the short-circuit path. A method for preventing a follow-up current in a detention section and a drawing section of a high-voltage overhead distribution line. 2. In a towing section for retaining a high-voltage overhead distribution line, which has an edged wire and a high-voltage solid insulator, an exposed charging section is provided on the edged wire, and the exposed charging section and the high-voltage solid insulator are provided. An inner wall surface covering both the upper end of the wire fixing bind wire tip portion is attached with an insulating cover, and when the covering body is attached, the edge-turning electric wire and the bind wire tip portion and the inner wall surface of the covering body are attached. There shall be a slit space in the longitudinal direction between the two, and when there is a lightning overvoltage intruding into the towing part, the flashover that advances on the binding wire for wire fixing and the wire around the edge should be reduced. A method for preventing a follow current in a detention section and a through section of a high-voltage overhead distribution line, characterized by preventing a follow current by passing through a gap space section and narrowing a cross-sectional area of a short circuit path. 3. An insulating material composed of a large number of particles is provided on the inner wall surface of the coating, and the flashover is passed between the particles when a flashover occurs due to intrusion of a lightning overvoltage. A method for preventing a follow-up current in the detention section and the drawing section of the high-voltage overhead distribution line according to claim 1 or 2.