JP2008010241A - Lightning arrester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightning arrester that avoids the occurrence of lightning strikes while preventing charges distributed in thunder clouds from being saturated. <P>SOLUTION: The lightning arrester A is composed of an upper electrode 2 having a hollow part, a lower electrode 3 similarly having a hollow part while being electrically connected to the ground E, and an annular insulator 4 that is sandwiched by the upper electrode 2 and the lower electrode body 3. When thunder clouds approach a lightning arresting pole member, the upper electrode works so as to eliminate a potential difference between the thunder clouds and the lower electrode having charges opposite to the charges distributed in the thunder clouds. Therefore, the upper electrode collects the charges opposite to those of in the lower electrode from in the surrounding atmosphere. Consequently, it is possible to avoid the occurrence of the lightning strikes. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lightning arrester for protecting equipment and the like from lightning damage, and more particularly to a lightning arrester for avoiding lightning strikes around the equipment and the like.

  When thunderclouds are generated and developed in the atmosphere, a leading discharge (step leader) is generated from the thundercloud's cloud bottom toward the ground, and when this leading discharge progresses, it has a charge opposite to that of the leading discharge from the ground surface side. Streamer discharge rises. When the preceding discharge and the streamer discharge are combined, a discharge path is formed between the ground and the thundercloud, and a large current flows between the thundercloud and the ground through the discharge path. This phenomenon is a lightning phenomenon.

  Conventional lightning arresters are configured to receive a lightning strike with a lightning striker located at a higher position than the object to be protected such as equipment including buildings, and to absorb a large current to the ground. It is configured so that no lightning strikes the object to be protected by receiving the lightning strike needle.

  As an example, Patent Document 1 discloses a lightning arrester that receives a lightning strike with a lightning arrester arranged at a position higher than the object to be protected and protects the object to be protected.

JP-A-10-261495

  A conventional lightning arrester that receives lightning strikes with a lightning striker located higher than the object to be protected and absorbs lightning strikes caused by insulation breakdown between the thundercloud and the ground must avoid direct lightning strikes on the object to be protected. Although it is possible, it is extremely difficult to eliminate the lightning strike itself.

  In addition, in the conventional lightning arrester using a lightning striker, the calculation using the angle method, which is the design method for installing the lightning striker, is not necessarily sufficient to protect the object to be protected. However, when recalculated with the rotating sphere method, which is a new design method, a design example in which it is necessary to install a lightning rod at a position higher than 10 m as compared with the angle method. Therefore, there is a problem that the construction cost of the lightning arrester increases.

  Furthermore, when the lightning strike is absorbed into the ground, the increase in the ground potential becomes a high potential, which may adversely affect the object to be protected. Therefore, it is necessary to make the earth ground resistance have a low resistance value, and thus there is a problem that the grounding cost of the lightning arrester increases.

  The objective of this invention is solving the subject which the conventional lightning arrester mentioned above has.

  In order to achieve the above-described object, the present invention provides a lightning arrester, first, an upper electrode body having a hollow portion, and a lower electrode body having a hollow portion and electrically connected to the ground, It is composed of an annular insulator sandwiched between an upper electrode body and a lower electrode body. Second, an upper projection is formed at the center of the top of the upper electrode body, and the bottom of the lower electrode body A lower convex part is formed in the central part.

  Since this invention has the structure mentioned above, there can exist the effect described below.

  The lightning arrester is composed of an upper electrode body having a hollow portion, a lower electrode body having a hollow portion and electrically connected to the ground, and an annular insulator sandwiched between the upper electrode body and the lower electrode body. As a result, when the thundercloud approaches the lightning pole member, the upper electrode works so as to eliminate the potential difference from the lower electrode body having a charge opposite to that distributed in the thundercloud. The body collects the charge opposite to that of the lower electrode body from the surrounding atmosphere, thus preventing the charge distributed in the thundercloud from being saturated, and thus the occurrence of lightning strikes. Can be avoided.

  The upper convex part is formed at the center of the top part of the upper electrode body, and the lower convex part is formed at the central part of the bottom part of the lower electrode body, thereby ensuring charge transfer between the upper electrode body and the lower electrode body. And can be started quickly.

  Examples of the present invention will be described below. However, the present invention is not limited to the examples as long as the gist of the present invention is not exceeded.

  Reference numeral 1 denotes a lightning pole member, and the lightning pole member 1 includes an upper electrode body 2, a lower electrode body 3, and an annular insulator 4. The upper electrode body 2 and the lower electrode body 3 are made of metal and have at least an aerial part, and in this embodiment, the upper electrode body 2 and the lower electrode body 3 are bowl-shaped bodies having a hollow inside. It is formed as. A hemispherical upper convex portion 2 a is formed at the center of the top portion of the upper electrode body 2, and a hemispherical lower convex portion 3 a is formed at the bottom central portion of the lower electrode body 3. Is formed.

  The peripheral end 2b of the upper electrode body 2 is formed to be thicker than the other portions, and the peripheral end 2b has a plurality of screw holes 2c at predetermined intervals along the circumferential direction. Is formed. Similarly, the circumferential end 3b of the lower electrode body 3 is formed thicker than the other portions, and the circumferential end 3b has a plurality of bolts at predetermined intervals along the circumferential direction. An insertion hole 3c is formed.

  The annular insulator 4 is formed of, for example, a synthetic resin such as a methacrylic resin or an epoxy resin excellent in weather resistance and excellent in strength, or porcelain or the like, and has a high insulation property having a predetermined thickness. It is formed as an annular body. The annular insulator 4 having a through hole 4a in the central region is configured to be sandwiched between the circumferential end 2b of the upper electrode body 2 and the circumferential end 3b of the lower electrode body 3. When the annular insulator 4 is sandwiched between the circumferential end portion 2b of the upper electrode body 2 and the circumferential end portion 3b of the lower electrode body 3, the outer peripheral portion 4b of the annular insulator 4 becomes the upper electrode body. 2 and the lower electrode body 3 are located outside.

  A plurality of bolt insertion holes 4c are formed at predetermined intervals along the circumferential direction in the outer peripheral portion 4b of the annular insulator 4, and the outer peripheral portion 4b of the annular insulator 4 has an annular shape. A plurality of screw holes 4d having a depth from the lower surface 4 ′ of the insulator 4 toward the upper surface 4 ″ of the annular insulator 4 and not reaching the upper surface 4 ″ of the annular insulator 4 are provided at a predetermined interval. Is formed.

  Pa is an upper annular packing having substantially the same outer diameter as the circumferential end 2b of the upper electrode body 2, and the inner diameter of the upper annular packing Pa is the same as or more than that of the through hole 4a of the annular insulator 4. It has a large diameter. The upper annular packing Pa is provided with a bolt insertion hole p1 corresponding to the screw hole 2c formed in the circumferential end 2b of the upper electrode body 2.

  Pb is a lower packing similar to the above-described upper annular packing Pa. The lower packing Pb has substantially the same outer diameter as the circumferential end 3b of the lower electrode body 3, and the inner diameter of the lower annular packing Pb is The diameter is the same as or larger than the through hole 4a of the annular insulator 4. The lower annular packing Pb has a bolt insertion hole p2 corresponding to the bolt insertion hole 3c formed in the circumferential end 3b of the lower electrode body 3.

  The upper electrode body 2 and the lower electrode body are respectively interposed via the upper annular packing Pa and the lower packing Pb so that the circumferential end 2b of the upper electrode body 2 and the circumferential end 3b of the lower electrode body 3 face each other. 3, when the annular insulator 4 is sandwiched, the bolt insertion hole 4 c formed in the outer peripheral portion 4 b of the annular insulator 4, the bolt insertion hole p 1 formed in the upper annular packing Pa, and the upper electrode body The screw hole 2c formed in the circumferential end portion 2b of the 2 is linearly aligned in the vertical direction, and the screw hole 4d formed in the outer periphery portion 4b of the annular insulator 4 is formed in the lower annular packing Pb. The bolt insertion hole p2 and the bolt insertion hole 3c formed in the circumferential end 3b of the lower electrode body 3 are configured to coincide with each other in a straight line in the vertical direction. And the bolt insertion hole 4c drilled in the outer peripheral part 4b of the cyclic | annular insulator 4 arrange | positioned linearly in the up-down direction, and the screw hole 2c formed in the circumferential end part 2b of the upper electrode body 2 A screw hole 4d formed in the outer peripheral portion 4b of the annular insulator 4 arranged in a straight line in the vertical direction, and a bolt insertion hole 3c formed in the peripheral end portion 3b of the lower electrode body 3. Are arranged so as to be displaced in the circumferential direction. Further, the lower electrode body 3 has a vertical screw hole 3d so as to be directed upward from the central lower surface of the lower electrode body 3 where the hemispherical lower convex portion 3a is located and so as not to penetrate the lower convex portion 3a. Is formed.

  The upper annular packing Pa is arranged on the upper surface 4 ″ of the annular insulator 4, and then the circumferential end 2b of the upper electrode body 2 is arranged on the upper surface 4 ″ of the annular insulator 4 via the upper annular packing Pa. Similarly, the lower annular packing Pb is disposed on the lower surface 4 ′ of the annular insulator 4, and then the circumferential shape of the lower electrode body 3 is disposed on the lower surface 4 ′ of the annular insulator 4 via the lower annular packing Pb. By arranging the end portion 3b, the upper electrode body 2 and the lower electrode body 3 are annularly insulated so that the circumferential end portion 2b of the upper electrode body 2 and the circumferential end portion 3b of the lower electrode body 3 face each other. Hold the body 4. Thereafter, a bolt insertion hole 4c drilled in the outer peripheral portion 4b of the annular insulator 4 in a state of being aligned linearly in the vertical direction, a bolt insertion hole p1 drilled in the upper annular packing Pa, and the periphery of the upper electrode body 2 The bolt B is inserted from below the annular insulator 4 into the screw hole 2c formed in the end portion 2b, and the screw portion b1 formed at the tip of the bolt B is connected to the circumferential shape of the upper electrode body 2 The annular insulator 4 is attached to the upper electrode body 2 via the upper annular packing Pa by screwing into the screw hole 2c formed in the end 2b. Similarly, a bolt insertion hole 3c formed in the circumferential end 3b of the lower electrode body 3 in a state of being aligned linearly in the vertical direction, a bolt insertion hole p2 drilled in the lower annular packing Pb, and an annular insulator The bolt B is inserted from below the lower electrode body 3 into the screw hole 4d formed in the outer peripheral portion 4b of the screw 4, and the screw portion b1 formed at the tip of the bolt B is inserted into the outer periphery of the annular insulator 4. The insulator 4 is attached to the lower electrode body 3 through the lower annular packing Pb by being screwed into the screw hole 4d formed in the portion 4b. Thus, the lightning pole member 1 in which the annular insulator 4 is sandwiched by the upper electrode body 2 and the lower electrode body 3 is assembled via the upper annular packing Pa and the lower annular packing Pb. A hemispherical upper convex portion 2a formed at the center of the top of the upper electrode body 2 constituting the lightning protection electrode member 1, and a hemispherical lower convex portion 3a formed at the center of the bottom of the lower electrode body 3; Are arranged so as to face each other in the vertical direction. The upper annular packing Pa and the lower annular packing Pb can be omitted as appropriate.

  Since the screw hole 4d formed in the annular insulator 4 is formed to a depth that does not reach the upper surface 4 ″ of the annular insulator 4, a bolt insertion hole formed in the circumferential end 3b of the lower electrode body 3 A bolt B that is inserted into 3c from below and screwed into a screw hole 4d formed in the outer peripheral portion 4b of the annular insulator 4 passes through the annular insulator 4, and the tip of the bolt B is connected to the upper electrode. The upper electrode body 2 and the lower electrode body 3 are in contact with the circumferential end 2b of the body 2 and are not electrically connected via the bolt B.

  Reference numeral 5 denotes a long support bolt made of a conductive material such as metal with a screw engraved around it. Reference numeral 6 denotes a substantially cylindrical pedestal. On the upper surface of the pedestal 6, a mounting recess 6 a is formed so that the lower surface central portion of the lower electrode body 3 comes into surface contact. The insertion hole 6 b through which the long support bolt 5 can be inserted is formed, and a fitting recess 6 c is formed in the lower part of the base 6.

  Reference numeral 7 denotes a cylindrical protective cylinder made of synthetic resin or metal. Reference numeral 8 denotes a holding body composed of a circumferential wall 8a and a top portion 8b. An annular step portion 8c is formed at an upper corner of the top portion 8b. Is formed at the upper end portion of the top portion 8b, and a cylindrical convex portion 8d into which the lower end portion of the protective cylinder 7 can be fitted is formed. Further, a long support is provided at the center portion of the top portion 8b. An insertion hole 8e through which the bolt 5 can be inserted is formed.

  Next, the lightning pole member comprising the upper electrode body 2, the lower electrode body 3, and the annular insulator 4 sandwiched between the upper electrode body 2 and the lower electrode body 3 via the upper annular packing Pa and the lower annular packing Pb. The attachment to the 1 long support bolt 5 is demonstrated.

  First, the pedestal 6 is arranged so that the mounting recess 6 a of the pedestal 6 is in surface contact with the center of the lower surface of the lower electrode body 3 constituting the lightning protection electrode member 1. Next, the upper end of the long support bolt 5 is inserted into the insertion hole 6 b of the base 6, and the upper end of the long support bolt 5 is screwed into a vertical screw hole 3 d formed in the lower electrode body 3. Thereafter, the nut N is screwed onto the long support bolt 5 via the washer W, and the nut N is tightened so as to contact the pedestal 6 from below via the washer W. The lightning pole member 1 is attached to the upper end of the bolt 5.

  Next, the protective cylinder 7 is arranged so as to surround the long support bolt 5, and the upper end portion of the protective cylinder 7 is fitted into the fitting recess 6 c of the pedestal 6, and then to the top portion 8 b of the holding body 8. The lower end portion of the long support bolt 5 is inserted into the drilled insertion hole 8e, and the lower end portion of the protective cylinder 7 is fitted to the cylindrical convex portion 8d of the holding body 8. Next, the nut N is screwed from the lower end of the long support bolt 5 so that the nut N is positioned in the circumferential wall 8a of the holding body 8 and is brought into contact with the top portion 8b. Thus, the lightning arrester A including the base 6, the long support bolt 5, the holding body 8 and the like is formed. The lower end of the long support bolt 5 has a predetermined length and is exposed from the holding body 8, and a washer can be interposed between the nut N and the top portion 8b of the holding body 8. . By arranging the protective cylinder 7 so as to surround the long support bolt 5, the long support bolt 5 is configured not to rust.

  Next, attachment of the lightning arrester A to the support member T such as a steel tower or a steel pillar will be described. The support member T is directly erected on the ground E or is erected on a building. In the present embodiment, an example is shown in which a supporting member T such as a steel tower or a steel pillar is erected on a base F embedded in the ground E.

  An object 10 to be protected such as an antenna is attached to the upper portion of the support member T via an appropriate attachment 9. A high-insulation insulator 11A such as an insulator is attached to the upper end portion of the support member T, and a flange 12 made of a conductive material such as metal is attached to the upper end portion of the insulator 11A. On the upper surface of the flange 12, a connecting flange 13 made of a conductive material such as a metal having a screw hole 13a is attached at the center with an appropriate fixing tool such as a bolt and a nut. Then, by screwing the lower end portion of the long support bolt 5 constituting the lightning arrester A described above into the screw hole 13a of the connecting flange 13, the lightning arrester A is attached to the support member T via the insulator 11A. Install.

  Reference numeral 14 denotes a pull-down line made of an insulation-coated cable. An upper end portion of the pull-down line 14 is connected to the connecting flange 13, and a lower end portion of the pull-down line 14 is a grounding electrode body 15 installed on the ground E. It is connected to the. Reference numeral 16 denotes a fastening band for fixing the pull-down line 14 to the support member T.

  Next, the operation of the lightning arrester A attached to the support member T through an insulator 11A such as an insulator will be described.

  When a thundercloud Ct matured in the atmosphere approaches the lightning arrester A attached to the upper part of the object 10 to be protected, the charge distributed on the cloud bottom of the thundercloud Ct (mostly a negative charge, which is described as a negative charge) In other words, on the surface of the ground E, a charge opposite to the negative charge distributed on the cloud bottom of the thundercloud Ct, that is, a positive charge is distributed. When the positive charge distributed on the surface of the ground E reaches a saturation level, the lightning pole member 1 having the same potential as the ground E is formed via the grounding pole body 15 and the pull-down line 14 installed on the ground E. Charges opposite to the charges of the thundercloud Ct, that is, positive charges are collected on the lower electrode body 3. Then, the upper electrode body 2 attached to the lower electrode body 3 via the annular insulator 4 works so as to eliminate the potential difference from the lower electrode body 3, so that it is opposite to the positive charge of the lower electrode body 3. Therefore, the negative charge distributed in the thundercloud Ct is not saturated, and the occurrence of lightning can be avoided. Further, the negative charge collected in the upper electrode body 2 and the positive charge in the lower electrode body 3 are neutralized through the annular insulator 4 and the surrounding air.

  As described above, the lower electrode body 3 has a charge opposite to that of the thundercloud Ct (the same charge as the ground), and the upper electrode body 2 eliminates the potential difference from the lower electrode body 3. Therefore, in order to collect the charge opposite to the charge of the lower electrode body 3 from the surrounding atmosphere, the atmosphere does not reach a condition for causing a lightning strike, and therefore it is possible to avoid the occurrence of a lightning strike. Further, an increase in the ground potential can be avoided, and accordingly, a high voltage of the ground potential is not generated in the object to be protected 10, so that no dielectric breakdown occurs.

  The lower electrode body 3 is configured so that the lower electrode body 3 has a pull-down line 14 by setting the ground electrode body 15 installed on the ground E to an annular ground or a mesh ground disposed so as to surround the object 10 to be protected when viewed in plan. Via the ground electrode body 15 to obtain a charge of the ground E (a charge opposite to that of the thundercloud Ct), and the upper electrode body 2 is actively activated so as to eliminate the potential difference with the lower electrode body 3. It becomes active to obtain a charge opposite to the charge held by the lower electrode body 3 from the surrounding atmosphere, and as a result, lightning can be further avoided.

  Furthermore, the operation states of the thundercloud Ct and the lightning arrester A will be described in detail.

  When a thundercloud Ct is generated and approaches the lightning arrester A, the charge on the surface of the ground E is opposite to the charge distributed on the cloud bottom of the thundercloud Ct (mostly a negative charge and will be described as a negative charge). That is, it will be positively charged. When the positive charge distributed on the surface of the ground E reaches a saturation level, the lightning pole member 1 having the same potential as the ground E is formed via the grounding pole body 15 and the pull-down line 14 installed on the ground E. Charges opposite to the charges of the thundercloud Ct, that is, positive charges are collected on the lower electrode body 3. On the other hand, the upper electrode body 2 collects a negative charge opposite to the positive charge of the lower electrode body 3 from the surrounding atmosphere in order to eliminate the potential difference with the lower electrode body 3.

  The negative charge of the upper electrode part 2 and the positive charge of the lower electrode part 3 are passed through a through hole 4a drilled in the annular insulating part 4, and the upper convex part 2a of the upper electrode body 2 and the lower convex part 3a of the lower electrode body 3 are used. The positive charge and the negative charge start to move between the positive electrode and the negative electrode. Then, the charge transfer gradually spreads over the entire upper electrode body 2 and the lower electrode body 3, and the charges move actively. Charge transfer occurs via 4. Further, when the thundercloud Ct approaches the lightning arrester A, the charge level moves more actively, a small current flows, and the upper electrode body 2 actively activates negative charges from the atmosphere around the lightning pole member 1. And the saturation of the negative charge in the atmosphere around the lightning pole member 1 is eliminated, and therefore the occurrence of a lightning strike is avoided. Thus, since the upper convex part 2a was formed in the top center part of the upper electrode body 2, and the lower convex part 3a was formed in the bottom center part of the lower electrode body 3, the upper electrode body 2 and the lower electrode body 3 are formed. Can be started reliably and quickly.

  The charge transfer phenomenon through the annular insulator 4 in the upper electrode body 2 and the lower electrode body 3 constituting the lightning protection pole member 1 starts when the thundercloud Ct approaches, and becomes active as the thundercloud Ct approaches, and becomes active as the thundercloud Ct moves away. Will continue to occur until the thundercloud leaves.

  According to the field test, the outer diameter of each of the upper electrode body 2 and the lower electrode body 3 formed as a bowl-shaped body is set to a radius of 50 mm, and the plate thickness of the annular insulator 4 is set to 20 mm. As a result of selecting the above-described lightning arrester A on the support member T, no lightning strikes were generated in the range of the installation place having a radius of 200 m. Moreover, as a result of measuring the charge level movement in the lightning pole member 1, the maximum reached 300 mA.

  As described above, since lightning can be avoided, an increase in ground voltage due to a large current caused by lightning can be avoided, and thus the object to be protected can be protected from high voltage.

  In addition, since it has a protection range by the angle method using the lightning arrester needle and the rotating sphere method, it is not necessary to install it at a higher place, and if the lightning arrester A is installed at a higher position than the object 10 to be protected. Therefore, the construction cost of the support member T such as a steel tower or steel pillar can be reduced.

  Furthermore, by installing the lightning arrester A having the above-described configuration, the lightning protection range is wide, and the surrounding area can also benefit from the protection range.

  In the embodiment described above, an example is shown in which the upper electrode body 2 and the lower electrode body 3 constituting the lightning protection pole member 1 are formed as a rod-shaped body that divides a hollow sphere inside. The structure is not limited to a body, and may be a box-like structure in which a hollow rectangular body is divided in half.

  In addition, the upper electrode body 2 and the lower electrode body 3 can be enlarged, and the annular insulating portion 4 can be made larger and thicker, thereby increasing the charge C level collection capability.

  Next, another embodiment of the present invention will be described with reference to FIG.

  In this embodiment, a metal support 11B is provided in place of a highly insulating insulator 11A such as an insulator attached to the upper end of the support member T, and the metal support 11B includes The flange 12 made of the above-described conductive material is attached. Since the attachment of the connecting flange 13 to the flange 12 and the attachment of the lightning pole member 1 to the connecting flange 13 are the same as those in the above-described embodiment, the description thereof is omitted.

  As described above, the support member T erected on the base F embedded in the ground E is electrically connected to the ground E by arranging the metal support 11B instead of the insulator 11A. Therefore, the lower electrode body 3 constituting the lightning pole member 1 is also electrically connected to the ground E. As described above, when the metal support 11B is provided instead of the insulator 11A, the lower electrode body 3 constituting the lightning protection pole member 1 is electrically connected to the ground E. The pull-down line 14 and the grounding electrode body 15 in the above-described embodiment can be omitted.

  The present invention relates to a lightning protection device A comprising an upper electrode body 2 having a hollow portion, a lower electrode body 3 also having a hollow portion and electrically connected to the ground E, an upper electrode body 2 and a lower electrode body 3 When the thundercloud Ct approaches the lightning pole member 1, the upper electrode body 2 causes the opposite charge to that of the lower electrode body 3 to be charged in the surrounding atmosphere. In order to avoid the occurrence of lightning, the lower electrode body 3 needs to be electrically connected to the ground E as described above.

  As described above, when the insulator 11A is used as a means for electrically connecting the lower electrode body 3 to the ground E, it is necessary to install the pull-down wire 14 and the ground electrode body 15, When the metal support 11B is used instead of the insulator 11A, the pull-down wire 14 and the grounding electrode body 15 can be omitted. Therefore, in view of simplification of the structure of the lightning arrester A, cost reduction, ease of maintenance, and the like, an embodiment using the metal support 11B instead of the insulator 11A is preferable.

  In the above-described embodiment, an example in which the upper electrode body 2 and the lower electrode body 3 are formed as a hollow bowl-shaped body is shown, but the upper electrode body 2 and the lower electrode body 3 Has at least a hollow portion, the hollow portion of the upper electrode body 2 and the hollow portion of the lower electrode body 3 are arranged so as to face each other with the annular insulator 4 interposed therebetween, and the upper electrode body 2 The hollow part and the hollow part of the lower electrode body 3 should just be connected through the through-hole 4a of the annular insulator 4, and the shape of the upper electrode body 2 and the lower electrode body 3 is limited to a bowl-shaped body. It is not a thing.

  The shape of the upper electrode body 2 is preferably a bowl-shaped body having no edge or corner. Thus, by making the upper electrode body 2 into a bowl-shaped body, the upper electrode body 2 for preventing lightning strikes has no edges or corners, and therefore lightning strikes are less likely to occur. On the other hand, since the lower electrode body 3 is unlikely to be a lightning strike point in the first place, it may be in a cylindrical shape or a rectangular tube shape as long as it has a hollow portion.

FIG. 1 is a vertical sectional view of a lightning arrester of the present invention. FIG. 2 is an exploded perspective view of the lightning arrester of the present invention. FIG. 3 is a front view of the lightning arrester of the present invention attached to the support member. 4 is a partially enlarged front view of FIG. 3 including a partial cross-section. FIG. 5 is a front view of the lightning arrester of the present invention in a state attached to the thundercloud and the support member. FIG. 6 is a front view of a lightning arrester of another embodiment of the present invention attached to a support member.

Explanation of symbols

A ... Lightning arrestor B ... Bolt N ... Nut Pa ...・ ・ ・ ・ ・ Upper ring packing Pb ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Lower ring packing T ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Supporting member 1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ Lightning pole member 2 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Upper electrode body 3 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Lower electrode body 4 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Ring Insulator 5 ... Long support bolt 6 ... Base 7 ... Protection cylinder 8 ································································ 11 ... Metal support 14 ......... Pull down line 15 ... ... ground polar body

Claims (2)

  An upper electrode body having a hollow portion, a lower electrode body having a hollow portion and electrically connected to the ground, and an annular insulator sandwiched between the upper electrode body and the lower electrode body Lightning arrester characterized by.   The lightning arrester according to claim 1, wherein an upper convex portion is formed at a central portion of the top portion of the upper electrode body, and a lower convex portion is formed at the central portion of the bottom portion of the lower electrode body.

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