JP2018010736A - Lightning suppression type lightning arrestor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightning suppression type lightning arrestor, capable of forming a lightning protection area in accordance with an object to be protected.SOLUTION: A lightning suppression type lightning arrestor includes: a second electrode body 5 erected between supports (2) with an interval therebetween; an insulating coating body 6 coating the second electrode body 5 and formed of an electrically insulating material; and a first electrode body 4 provided to cover the surface of the insulating coating body 6. The second electrode body 5 is grounded.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lightning-suppressing lightning arrester for protecting a protected body such as a building or equipment from lightning damage by suppressing lightning.

  Lightning strikes are discharge phenomena that occur in the atmosphere. Lightning discharges include in-cloud discharges, inter-cloud discharges, and cloud-ground discharges. It is the cloud-to-ground discharge (hereinafter referred to as lightning strike) that causes significant damage from lightning discharge. A lightning strike is a phenomenon that occurs when the electric field strength between a thundercloud (cloud bottom) and a structure constructed on the earth or ground becomes very large, and its charge is saturated to break the insulation of the atmosphere. is there.

When lightning phenomena are observed in detail, in the case of a general lightning (summer lightning) that occurs in the summer, when the thundercloud matures, the steppedore approaches the ground from the thundercloud, selecting where it is likely to discharge air.
When the stepreader is at a certain distance from the ground, a weak current upward streamer (greeting discharge) extends from the ground, a building (lightning rod), a tree, or the like toward the stepreader.
When this streamer and steppeda are coupled, a large current (feedback current) flows between the thundercloud and the ground through the path.
This is a lightning phenomenon.

  In view of such a lightning phenomenon, most conventional lightning protection concepts have received a lightning strike to a ground with a needle-type lightning rod (Franklin rod) from the viewpoint that lightning cannot be prevented.

  On the other hand, the present inventors have proposed a lightning suppression type lightning arrester shown in Patent Document 1 in order to protect the protected object by suppressing the occurrence of lightning as much as possible.

  This lightning-suppressing type lightning arrester has an upper electrode body and a lower electrode body arranged with an insulator interposed therebetween, and is configured by grounding only the lower electrode body.

  For example, when a thundercloud in which negative charges are distributed at the cloud bottom approaches, charges opposite to the thunderclouds (plus charges) are distributed on the surface of the ground, and positive charges are also collected on the grounded lower electrode body.

  Then, the upper electrode body disposed via the insulator is negatively charged by the action of the capacitor.

  This action makes it difficult to generate upward streamers in the lightning arrester and its surroundings and suppresses the occurrence of lightning strikes.

Japanese Patent No. 5839331

  By the above-mentioned proposal by the present inventors as described above, lightning can be suppressed in a circular protection area centering on the lightning arrester.

  However, the objects to be protected against lightning are diversified, and it has been found that it is necessary to form an optimal protection region corresponding to the diversification of the objects to be protected.

  The present invention has been made on the basis of the above-described knowledge, and is formed by a second electrode body that is installed between supports that are erected at intervals, and an electrically insulating material that covers the second electrode body. And a first electrode body provided so as to cover the surface of the insulating coating body, and the second electrode body is grounded.

  By adopting such a configuration, the first electrode body and the second electrode body are held at a predetermined interval by the insulating coating body over their entire length and are electrically insulated. Retained.

  Then, for example, when a thundercloud with negative charges distributed on the cloud bottom approaches, the opposite charge (plus charge) is distributed on the surface of the ground, and the grounded second electrode body also has a negative charge on the cloud bottom. It is attracted and positive charges are collected.

Then, the first electrode body disposed on the second electrode body via the insulating coating body is negatively charged by the action of the capacitor.
This action makes it difficult to generate upward streamers in the first electrode body and its periphery, and can suppress the occurrence of lightning strikes.
That is, when a positive charge is attracted to the second electrode body by being attracted by a negative charge on the cloud base, the positive charge is also distributed on the surface of the second electrode body. Then, as a negative charge is charged on the inner surface of the first electrode body, a positive charge is charged on the outer surface of the first electrode body. At this time, the atmosphere contains a lot of negatively charged raindrops and fine particles, and the positive charge on the outer surface of the first electrode body is neutralized because it is a small amount of positive charge, and thereafter it is charged with a negative charge. It is considered that the phenomenon that the electric charge on the outer surface of the first electrode body changes from plus to minus occurs in a very short time and thereafter becomes minus.
This action makes it difficult to generate upward streamers in the first electrode body and its periphery, and can suppress the occurrence of lightning strikes.

  On the other hand, since the first electrode body and the second electrode body are formed in a linear shape, the above-described protective regions that suppress the occurrence of lightning strikes are provided on both sides of the first electrode body. It is formed in a strip shape so as to extend in the length direction.

  Therefore, the above-described protection region formed by these can be freely formed by adjusting the installation form of the first electrode body and the second electrode body, for example, the installation length and the installation shape in plan view. Can do.

  As a result, the protection area can be set in accordance with the protection target to be protected, and an optimal protection area can be formed for the protection target.

  In addition, since the first electrode body, the second electrode body, and the insulating coating body have an integrated structure that is concentrically stacked, the handling is easy and high workability is ensured. can do.

  On the other hand, a general power transmission facility is provided with a power transmission path in which a transmission line is supported by a number of steel towers. In this power transmission path, in order to guide lightning strikes to the ground via the steel tower, the top of adjacent steel towers is arranged. An imaginary ground wire is installed in

  Therefore, by installing the lightning suppression type lightning arrester of the present invention in place of the overhead ground wire between the steel towers, the power transmission path can be protected from lightning.

  Here, by connecting the second electrode body to the steel tower, the lightning-reducing lightning arrester of the present invention can be installed, and the second electrode body can be grounded.

  Alternatively, a ground wire can be prepared separately, and the second electrode body can be grounded using this ground wire.

On the other hand, by forming the first electrode body into a cylindrical shape by combining a plurality of strands, the insulating covering body can be sequentially covered in the length direction.
Thereby, a continuous cable-like lightning suppression type lightning arrester can be obtained.

As described above, the first electrode body can be made flexible by using the first electrode body as a stranded wire.
As a result, the lightning suppression type lightning arrester can be wound around a bobbin or the like, and not only can the length be increased, but also storage and transportation are facilitated.

  The above-described flexibility can be imparted by forming the first electrode body by weaving a plurality of strands into a cylindrical shape.

  According to the lightning suppression type lightning arrester of the present invention, it is possible to easily form lightning protection regions corresponding to various protected objects.

It is a schematic front view of the power transmission path where the 1st Embodiment of this invention was applied. BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which shows the 1st Embodiment of this invention and shows the formation method of a 1st electrode body. The 1st Embodiment of this invention is shown, and it is an enlarged view of the principal part which shows an example of construction structure. It is the schematic for demonstrating the streamer generation | occurrence | production suppression effect in this invention.

A first embodiment of the present invention will be described below with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a lightning suppression type lightning arrester (hereinafter abbreviated as a lightning arrester) according to this embodiment, which is applied to a power transmission path.

  The lightning arrester 1 is provided between the steel towers 2 of the power transmission path constituting the support, and is installed between the tops of the steel towers 2 via a connector 3.

  More specifically, the lightning arrester 1 includes an insulation formed by a second electrode body 5 connected to the top of the steel tower 2 via the connector 3 and an electrically insulating material covering the second electrode body 5. A covering body 6 and a first electrode body 4 provided so as to cover the surface of the insulating covering body 6 are provided, and the second electrode body 5 has the other end of the ground wire 7 with one end embedded in the ground G. Are connected, and the second electrode body 5 is grounded via the ground wire 7.

  As shown in FIG. 2, the second electrode body 5 is a stranded wire formed by twisting a plurality of strands, and the surface thereof is covered with the insulating covering body 6 having a predetermined thickness.

  For example, a synthetic resin such as cross-linked polyethylene or vinyl is used for the insulating cover 6, and the surface of the second electrode body 5 is covered and integrated by means such as extrusion molding.

  The first electrode body 4 is integrated so as to cover the surface of the insulating coating body 6 by twisting a plurality of strands 4 a so as to wrap the insulating coating body 6.

  The first electrode body 4, the second electrode body 5, and the insulating covering body 6 integrated in this way are such that the first and second electrode bodies 4, 5 are formed of stranded wires, Further, since the insulating cover 6 is formed of a synthetic resin such as cross-linked polyethylene or vinyl, the entire structure is flexible.

  The connecting tool 3 is formed by, for example, an insulator, and the second electrode body 5 is connected to the two towers 2 by connecting each end of the second electrode body 5 to the top of the pair of towers 2. It is installed with electrical insulation between them.

  This electrically insulates the first electrode body 4 or the second electrode body 5 from the tower 2 so that the tower 2 does not become a discharge path during a lightning strike, and protects the tower 2 from lightning strikes. It is to do.

  Next, the lightning strike suppression function by the lightning arrester 1 of this embodiment installed in this way will be described with reference to the schematic diagram shown in FIG.

  When the thundercloud C in which negative charges are distributed on the cloud bottom approaches, the opposite charge (plus charge) is distributed on the surface of the ground G, and is attracted to the negative charges on the cloud bottom and is grounded. A positive charge also collects in the body 5.

On the other hand, the first electrode body 4 opposed to the second electrode body 5 via the insulating coating body 6 is negatively charged by the action of a capacitor.
Due to this action, an upward streamer is unlikely to occur in the first electrode body 4 and its periphery, and as a result, the occurrence of lightning strikes is suppressed.
FIG. 4 is a diagram for explaining a state in which the surface of the first electrode body 4 is negatively charged.
Considering the process in which the first electrode body 4 is negatively charged, the following phenomenon is considered.
When positive charges are attracted to the second electrode body 5 by being attracted by the negative charges on the cloud base, the positive charges are also distributed on the surface of the second electrode body 5. Then, as the negative charge is charged on the inner surface of the first electrode body 4, the positive charge is charged on the outer surface of the first electrode body 4. At this time, the atmosphere contains many negatively charged raindrops and fine particles, and the positive charge on the outer surface of the first electrode body 4 is neutralized because it is a small amount of positive charge. . The phenomenon that the charge on the outer surface of the first electrode body 4 changes from plus to minus occurs in a very short time and is considered to become minus thereafter.
This action makes it difficult for the upward streamer to occur in the first electrode body 4 and its surroundings, and to suppress the occurrence of lightning strikes.

  Thus, the area where lightning is prevented from being generated by the first electrode body 4, that is, the lightning protection area, is a predetermined range on both sides of the first electrode body 4 in plan view, and the length of the first electrode body 4 is longer. It is formed in a strip shape extending in the vertical direction.

  Thus, the lightning protection area is formed based on the construction of the first electrode body 4.

  Therefore, by setting the erection form of the first electrode body 4 corresponding to the object to be protected, it is possible to set an optimum lightning protection region for the object to be protected.

  For example, the lightning protection region can be freely set by changing the length of the first electrode body 4, bending it in plan view, or installing it in a zigzag manner.

  On the other hand, by appropriately selecting the structure of the first electrode body 4 and the second electrode body 5 and giving them flexibility, the structure can be wound around a bobbin or the like, and stored or transported in a long state. Etc. can be made possible.

  The various shapes, dimensions, and the like of the constituent members shown in the embodiments are merely examples, and various changes can be made based on design requirements and the like.

  For example, in the said embodiment, although the example which installed the lightning arrester 1 between the towers 2 of a power transmission path was shown, it replaces with this, for example, installs a support body in the waist wall provided on the roof of a building. And it is also possible to install between these support bodies.

  Moreover, although the said 2nd electrode body 5 was set as the structure earthed | grounded via the ground wire 7, this 2nd electrode body 5 is formed by using the electrically conductive material for the connection tool 3 without using this ground wire 7. It is also possible to install it via the steel tower 2.

Further, the surface between the first electrode body 4 and the second electrode body 5 is covered by covering the surface of the second electrode body 5 with an insulating covering body 6 having a predetermined thickness by means such as extrusion molding of synthetic resin. However, other configurations may be employed.
For example, a linear or belt-like insulator formed of a synthetic resin or the like may be wound around the surface of the second electrode 5 in a spiral manner to form the insulating cover 6. In this case, a spiral space in which the insulator is not filled is formed between the first electrode body 4 and the second electrode body 5 by adjusting the winding pitch of the linear or belt-like insulator. be able to. With this spiral space, weight reduction and improvement in flexibility can be achieved.

The first electrode body 4 is integrated so as to cover the surface of the insulating covering 6 by twisting a plurality of strands 4a so as to wrap the insulating covering 6; The electrode body 4 may be formed of a conductive paint or a conductive resin layer. In the case of a conductive paint, it can be formed by applying to the surface of the insulating coating 6. In the case of a conductive resin layer, it can be formed by extruding a conductive resin on the surface of the insulating covering 6.

1 (Lightning suppression type) Lightning arrester 2 Steel tower (support)
3 connector 4 first electrode body 5 second electrode body 6 insulation covering body 7 grounding wire C thundercloud G ground

Claims (5)

  A second electrode body laid between the support members standing at an interval, an insulating cover formed of an electrically insulating material covering the second electrode body, and a surface of the insulating cover are covered. A lightning suppression lightning arrester, wherein the second electrode body is grounded.   The support body is formed of a conductive material, and the second electrode body is grounded via the support body by electrically connecting the second electrode body to the support body. The lightning-suppressing type lightning arrester according to claim 1.   2. The lightning strike suppression according to claim 1, wherein a ground wire formed of a conductive material is connected to the second electrode body, and the second electrode body is grounded via the ground wire. Type lightning arrester.   The lightning strike suppression lightning arrester according to any one of claims 1 to 3, wherein the first electrode body is formed in a cylindrical shape by a stranded wire composed of a plurality of strands. The lightning strike suppression lightning arrester according to any one of claims 1 to 3, wherein the first electrode body is formed by weaving a plurality of strands into a cylindrical shape.