JP5780552B2 - Lightning suppression type lightning arrester - Google Patents

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.

  In the conventional lightning protection concept, from the viewpoint that lightning strikes cannot be prevented, most of the methods receive lightning strikes to a ground with a pointed lightning rod (Franklin rod).

In recent years, the concept of lightning protection has been revised, and there is a movement (new JIS A4201 2003 edition) that shifts from the angle method to the rotating sphere method, but in any case, it has been difficult to completely eliminate the damage caused by lightning. In particular, when the scale of lightning strike (current value and duration) is large, such as winter lightning, various damages are caused by the lightning current itself and the potential increase of the ground.
Furthermore, recent devices tend to be vulnerable to abnormal currents due to the integration of ICs, and the problem of lightning strikes is increasing.

On the other hand, a charge dissipation type lightning protection system (DAS) has been developed as a technology for preventing lightning (see Patent Document 1). However, this system is expensive because it is a large-scale equipment, and it is actually used only for special equipment.
In recent years, a deionization capacity type lightning rod (PDCE) has appeared as a technique for suppressing a lightning strike and has been effective (see Patent Document 2 and Patent Document 3).

  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) 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.

  The deionization capacity type lightning rod (PDCE) described in Patent Document 2 is a lightning suppression type lightning rod, which is less likely to generate an upward streamer. For this reason, lightning strikes are unlikely to occur at facilities where the PDCE is installed at the highest part.

  This PDCE has an upper electrode body and a lower electrode body arranged with an insulator interposed therebetween, and only the lower electrode body is grounded. Therefore, for example, when a thundercloud with negative charges distributed at the bottom of the cloud approaches, the opposite charge (plus charge) is distributed on the surface of the earth, attracted by the positive charge at the bottom of the cloud, and positive charges are also charged to the lower electrode body. Get together. Then, the upper electrode body arranged via the insulator is negatively charged by the action of the capacitor. This action makes it difficult to generate upward streamers in the PDCE and its surroundings, and suppresses the occurrence of lightning strikes.

A PDCE was installed on the Hokuriku flatland, and lightning strikes were observed using a lightning observation camera and LLS (Lightning Location System) for five years. As a result, no lightning was observed at the PDCE installation in the summer.
From these observation results, it was found that PDCE prevents return current (prevents lightning strike) and suppresses damage caused by lightning strikes during summer thunder.

JP-A-8-273715 JP 2008-10241 A JP 2010-205687 A

The present inventors have found that the suppression effect can be increased by increasing the insulation between the upper and lower electrode bodies of the PDCE while studying the mechanism of summer thunder suppression by the PDCE. Yes.
However, when the structure where the PDCE is installed is very high or at the top of a high mountain, it was rarely seen that a lightning strike with a large current (approximately 100 kA or more) occurred. It is considered that this was induced by a strong stepped leader, and the discharge level of the streamer (greeting discharge) was released and combined beyond the insulation strength (approximately 100 kV) of PDCE, resulting in a lightning strike.

  Up to now, PDCE has been installed in the same shape regardless of the installation environment. However, if the height of the structure is higher than the field data (approximately 100m or more in the plain), or if it is on the top of the mountain, the PDCE It has been found effective to adjust the discharge start voltage of the upper and lower electrodes.

However, when manufacturing the optimal product for each place where PDCE is installed, in order to cope with the conventional method, since the cylindrical insulator and the cover member are each integrally structured, a large number of molds are generated, cost, The problem that management becomes difficult arises.
That is, in order to adjust the discharge start voltage of the upper and lower electrodes of PDCE, the length of the cylindrical insulator between the upper electrode body and the lower electrode body, the thickness and shape of the cover member, etc. are changed and adjusted. . At that time, it is only necessary to adjust the cutting length for the cylindrical insulator, but for the cover member, various types of molds are required to manufacture cover members having different thicknesses and shapes, and the cost is accordingly increased. Management becomes difficult.

  Accordingly, the present invention provides a lightning-suppressing type lightning arrester capable of reducing the manufacturing cost, simplifying management, etc., as a structure that can easily adjust the insulation distance of the upper and lower electrodes corresponding to the discharge start voltage of the upper and lower electrodes stepwise. It is an object to provide an apparatus.

  In order to solve the above problems, a lightning suppression type lightning arrester according to the present invention includes a lightning pole member having an insulator that insulates an upper electrode body and a lower electrode body, and a support member provided below the lightning pole member. And the insulator includes a cylindrical insulator disposed between the upper electrode body and the lower electrode body, and a cover member disposed around the cylindrical insulator, and the cover member Is constituted by a plurality of unit cover members stacked.

  According to the present invention, since the cover member arranged around the cylindrical insulator is constituted by a plurality of stack type unit cover members, the upper and lower electrodes can be simply changed by changing the number of stacked unit cover members. The insulation distance between the upper and lower electrodes corresponding to the body spacing can be easily adjusted stepwise. Thereby, the discharge start voltage of the upper and lower electrodes can be easily adjusted stepwise by one type of unit cover member, and the manufacturing cost can be reduced and the management can be simplified.

In a preferred embodiment of the present invention, the upper electrode body and the lower electrode body are connected by the cylindrical insulator, and a vent hole penetrating in the thickness direction of the peripheral wall is provided in the peripheral wall of the cylindrical insulator. It is characterized by that.
As described above, by providing a vent hole penetrating the peripheral wall of the cylindrical insulator in the thickness direction of the peripheral wall, it is possible to suppress an increase in the internal pressure of the lightning pole member in a certain range in the event of a lightning strike.

In a preferred embodiment of the present invention, a gap is formed between the cylindrical insulator and the cover member, and the vent hole communicates with the gap.
By forming a gap between the cylindrical insulator and the cover member in this way, it is possible to form an air passage that leads from the cylindrical insulator to the outside using this gap.

In a preferred embodiment of the present invention, each unit cover member of the cover portion is configured to be movable up and down.
Thus, each unit cover member is configured to be movable up and down, whereby a gap serving as a ventilation path can be formed between the upper and lower electrode bodies and the cover member and between the unit cover members. .

In a preferred embodiment of the present invention, a ventilation groove is provided on at least one of the opposing surfaces of the unit cover member, one end of the ventilation groove communicates with the gap, and the other end communicates with the outside air. It is characterized by.
When such a ventilation groove is formed, a ventilation path that communicates with the outside air from the inside of the cylindrical insulator can be formed via the ventilation hole, the gap, and the ventilation groove. Therefore, in this case, it may not be necessary to provide a gap between the upper and lower electrode bodies and the cover member.

In a preferred embodiment of the present invention, one end portion of the ventilation groove is positioned higher than the other end portion.
Thus, by positioning one end portion of the ventilation groove higher than the other end portion, it is possible to effectively prevent moisture from entering the lightning pole member through the ventilation groove. .

In a preferred embodiment of the present invention, a plurality of the ventilation grooves are provided, and each of the ventilation grooves extends radially.
Thus, by arranging each ventilation groove radially, the gas discharge function inside the lightning protection electrode member in the event of a lightning strike can be made uniform as a whole.

  According to the present invention, as a structure in which the upper and lower electrode insulation distance corresponding to the discharge start voltage of the upper and lower electrodes can be easily adjusted step by step, lightning suppression type lightning arrester capable of reducing manufacturing costs, simplifying management, etc. An apparatus can be provided.

1 is a partial cross-sectional front view of a lightning-reducing lightning arrester according to Embodiment 1 of the present invention. It is a top view of the unit cover member of the lightning suppression type lightning arrester which concerns on Embodiment 1 of this invention. It is a center sectional view of a unit cover member of a lightning-reducing lightning arrester according to Embodiment 1 of the present invention. It is a partial cross section front view of the lightning strike suppression lightning arrester which concerns on Embodiment 2 of this invention. It is a bottom view of the unit cover member of the lightning strike suppression type lightning arrester which concerns on Embodiment 3 of this invention. It is a center sectional view of a unit cover member of a lightning suppression lightning arrester according to a third embodiment of the present invention. It is a center sectional view of the state where the unit cover member of the lightning strike suppression lightning arrester concerning Embodiment 3 of the present invention was piled up.

(Embodiment 1)
Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to FIGS.
FIG. 1 is a view showing an embodiment in which the present invention is applied to a deionization capacity type lightning rod, and a characteristic portion is shown in cross section. FIG. 2 is a plan view of a unit cover member of the cover member according to the first embodiment, and FIG. 3 shows a central section thereof.

  As shown in FIGS. 1 and 2, the lightning suppression lightning arrester A according to this embodiment includes a lightning pole member 1 disposed at the top, a connecting portion 2 provided at the lower portion of the lightning pole member 1, And a support member 3 that is vertically connected through the connecting portion 2 and supports the lightning pole member 1.

  The lightning pole member 1 includes an upper electrode body 11, a lower electrode body 12, and an insulator 13 provided between the upper electrode body 11 and the lower electrode body 12, and is formed in a substantially spherical shape as a whole. . The upper electrode body 11 and the lower electrode body 12 are formed in a slightly flat hemispherical shape in which a sphere is divided in half. Therefore, those surfaces are formed as curved surface portions 11a and 12a that come into contact with the atmosphere.

  The upper electrode body 11 and the lower electrode body 12 are formed in a cavity as illustrated. Further, a downward convex portion 11 b and an upward convex portion 12 b facing each other from the top surface of the upper electrode body 11 and the inner bottom surface of the lower electrode body 12 are formed. The interval H1 is set so that the downward convex portion 11b and the upward convex portion 12b exhibit a function as a discharging convex portion.

  The insulator 13 includes a cylindrical insulator 14 disposed between the upper electrode body 11 and the lower electrode body 12 and a cover member 15 disposed around the cylindrical insulator 14. The cylindrical insulator 14 is formed in a thick cylindrical shape and is provided to reinforce the electrical insulation between the upper and lower electrode bodies 11 and 12 and to connect the upper and lower electrode bodies 11 and 12 coaxially. It has been. On the surfaces (lower surface and upper surface) where the upper electrode body 11 and the lower electrode body 12 face each other, annular grooves 11c and 12c that make a round in the circumferential direction are formed, and the upper and lower ends of the cylindrical insulator 14 are formed in the annular grooves 11c and 12c. Are fitted and integrated by an adhesive or the like.

  In this embodiment, the cover member 15 disposed outside the cylindrical insulator 14 is composed of two unit cover members 151 and 151 stacked in two upper and lower stages. The two unit cover members 151 and 151 have the same shape, and each is formed in a substantially donut shape.

  In this embodiment, the upper electrode body 11 and the lower electrode body 12 are connected in a liquid-tight and air-tight manner by a cylindrical insulator 14. The peripheral wall of the cylindrical insulator 14 is provided with a vent hole 141 penetrating in the thickness direction of the peripheral wall in the peripheral wall portion of the intermediate portion in the length direction. A gap 16 is formed between the cylindrical insulator 14 and the cover member 15, and a vent hole 141 communicates with the gap 16.

  A gap 17 is formed between the upper electrode body 11 and the cover member 15. Due to the presence of the gap 17, the unit cover members 151 and 151 of the cover member 15 are configured to be movable up and down.

  As shown in FIGS. 2 and 3, each unit cover member 151 is formed with a central insertion port 15 a having an inner diameter larger than the outer shape of the cylindrical insulator 14. Further, on the upper surface of each unit cover 151, an annular rising portion 15b formed so as to surround the central insertion port 15a, a flat upper surface 15c extending from the rising portion 15b toward the outer peripheral side, and the flat upper surface An inclined upper surface 15d extending from 15c to the outer peripheral edge is provided.

Further, the lower surface of the unit cover member 151 includes a flat lower surface 15e formed at a position corresponding to the flat upper surface 15b, and a rising portion 15b of the lower unit cover member 151 at a position immediately below the rising portion 15b. An annular housing recess 15f for housing is provided. Further, a draining recess 15g having a semicircular cross section is provided on the lower surface of the unit cover member 151 near the outer peripheral edge.

The unit cover member 151 and the cylindrical insulator 14 are preferably made of an insulating material such as plastic, ceramic, insulator or rubber.
The support member 3 includes a support bar 31 located at the center and a support pipe 32 arranged coaxially on the outside thereof. The lower end portion of the support bar 31 is provided with a screw portion 33 that is coupled to another support member.

  The upper electrode body 11, the lower electrode body 12, the connecting portion 2, and the support member 3 of the lightning protection electrode member 1 are formed of a durable and conductive metal such as stainless steel. The lower electrode body 12 is electrically connected to the ground via the support member 3 and a grounding conductor (ground wire) (not shown). Thereby, in the state where this lightning suppression type lightning arrester A is installed vertically, when the ground or structure is charged with a positive charge due to the influence of thunderclouds or the like, the surface of the upper electrode body 11 is charged with a negative charge. When the structure or the like is charged with a negative charge, the surface of the upper electrode body is designed to be charged with a positive charge. This charging function itself is based on the same principle as that of the existing PDCE.

  According to the present embodiment, the cover member 15 disposed around the cylindrical insulator 14 is constituted by a plurality of stackable unit cover members 151. Therefore, only the number of stacked unit cover members 151 is changed. Thus, the insulation distance H1 between the upper and lower electrodes corresponding to the distance between the upper and lower electrode bodies 11 and 12 can be easily adjusted step by step. Thereby, the discharge start voltage of the upper and lower electrodes can be easily adjusted stepwise by one type of unit cover member, and the manufacturing cost can be reduced and the management can be simplified.

  In addition, by providing the peripheral wall of the cylindrical insulator 14 with a ventilation hole 141 penetrating in the thickness direction of the peripheral wall, it is possible to suppress an increase in the internal pressure of the lightning pole member 1 to a certain range in the event of a lightning strike. it can. Further, by forming the gap 16 between the cylindrical insulator 14 and the cover member 15, it is possible to form an air passage that communicates from the inside of the cylindrical insulator 14 to the outside using the gap 16. . Since the gap 16 is formed between the upper electrode body 11 and the cover member 15, even when the lightning arrester is installed at a high temperature location such as a chimney, the gap 16 is lowered due to a decrease in volume specific resistance of the cover member itself. Reduction of the insulation resistance of the electrode can be prevented.

  Further, each unit cover member 151 is configured to be movable up and down, so that a gap serving as a ventilation path is formed between the upper and lower electrode bodies 11 and 12 and the cover member 15 and between the unit cover members 151. Can be formed.

(Embodiment 2)
FIG. 4 is a partial cross-sectional front view showing Embodiment 2 of the lightning suppression lightning arrester according to the present invention. In the same embodiment, components that are basically the same as those of the previous embodiment are denoted by the same reference numerals and description thereof is simplified.

  As shown in FIG. 4, the lightning suppression lightning arrester B according to this embodiment also includes a lightning pole member 1 disposed at the uppermost part, a connection part 2 provided at a lower part of the lightning pole member 1, and the connection part. And a support member 3 that is connected vertically through 2 to support the lightning pole member 1.

  The lightning pole member 1 includes an upper electrode body 11, a lower electrode body 12, and an insulator 13 provided between the upper electrode body 11 and the lower electrode body 12, and is formed in a substantially spherical shape as a whole. . The upper electrode body 11 and the lower electrode body 12 are formed in a slightly flat hemispherical shape in which a sphere is divided in half. Therefore, those surfaces are formed as curved surface portions 11a and 12a that come into contact with the atmosphere.

  The upper electrode body 11 and the lower electrode body 12 are formed in a cavity as illustrated. Further, a downward convex portion 11 b and an upward convex portion 12 b facing each other from the top surface of the upper electrode body 11 and the inner bottom surface of the lower electrode body 12 are formed. These downward projections 11b and upward projections 12b are spaced from each other so as to function as discharge projections. The interval H2 between the downward convex portion 11b and the upward convex portion 12b is set larger than the interval H1 in the first embodiment.

  The insulator 13 includes a cylindrical insulator 14 disposed between the upper electrode body 11 and the lower electrode body 12 and a cover member 15 disposed around the cylindrical insulator 14. The cylindrical insulator 14 is formed in a thick cylindrical shape, and connects the upper and lower electrode bodies 11 and 12 coaxially. On the surfaces (lower surface and upper surface) where the upper electrode body 11 and the lower electrode body 12 face each other, annular grooves 11c and 12c that make a round in the circumferential direction are formed, and the upper and lower ends of the cylindrical insulator 14 are formed in the annular grooves 11c and 12c. Are fitted and integrated by an adhesive.

  In this embodiment, the cover member 15 disposed outside the cylindrical insulator 14 is constituted by four unit cover members 151 stacked in four upper and lower stages. The four unit cover members 151 and 151 have the same shape, and each has a substantially donut shape.

  In this embodiment, the upper electrode body 11 and the lower electrode body 12 are connected in a liquid-tight and air-tight manner by a cylindrical insulator 14. The peripheral wall of the cylindrical insulator 14 is provided with a vent hole 141 penetrating in the thickness direction of the peripheral wall portion in the peripheral wall portion of the intermediate portion in the length direction. A gap 16 is formed between the cylindrical insulator 14 and the cover member 15, and a vent hole 141 communicates with the gap 16.

  A gap 17 is formed between the upper electrode body 11 and the cover member 15. Due to the presence of the gap 17, the unit cover members 151 and 151 of the cover member 15 are configured to be movable up and down.

The unit cover member 151 and the cylindrical insulator 14 are preferably made of an insulating material such as plastic, ceramic, insulator or rubber.
The support member 3 includes a support bar 31 located at the center and a support pipe 32 arranged coaxially on the outside thereof. The lower end portion of the support bar 31 is provided with a screw portion 33 that is coupled to another support member.

  The upper electrode body 11, the lower electrode body 12, the connecting portion 2, and the support member 3 of the lightning protection electrode member 1 are formed of a durable and conductive metal such as stainless steel. The lower electrode body 12 is electrically connected to the ground via the support member 3 and a grounding conductor (ground wire) (not shown). Thereby, in the state where this lightning suppression type lightning arrester B is installed vertically, when the ground or a structure is charged with a positive charge due to the influence of thunderclouds or the like, the surface of the upper electrode body 11 is charged with a negative charge. When the structure or the like is charged with a negative charge, the surface of the upper electrode body is designed to be charged with a positive charge.

  The lightning-suppressing lightning arrester B according to the second embodiment basically exhibits substantially the same function as the lightning-suppressing lightning arrester A according to the first embodiment. There is an operational effect superior to that of the lightning arrester A.

  That is, in the second embodiment, the unit cover members 151 are stacked in four stages to form the cover member 15, so that the insulation distance H2 between the upper and lower electrodes can be increased. Therefore, the insulation distance H2 of the upper and lower electrodes corresponding to the distance between the upper and lower electrode bodies 11 and 12 can be easily adjusted stepwise simply by changing the number of unit cover members 151 stacked. Thereby, the discharge start voltage of the upper and lower electrodes can be easily adjusted stepwise by one type of unit cover member, and the manufacturing cost can be reduced and the management can be simplified.

(Embodiment 3)
FIG. 5 is a bottom view of a unit cover member 151 according to Embodiment 3 of the present invention, FIG. 6 is a cross-sectional view, and FIG. 7 is a cross-sectional view in a state of being stacked in two stages. In the same embodiment, components that are basically the same as those of the previous embodiment are denoted by the same reference numerals and description thereof is simplified.
The cover member 15 of this embodiment is characterized in that a ventilation groove 15h is provided on at least one surface (bottom surface) of the opposing surfaces of the unit cover member 151.

  A plurality of the ventilation grooves 15h are provided in a form extending radially. One end portion of each ventilation groove 15h communicates with the gap 16, and the other end portion communicates with the outside air. Furthermore, it is considered that one end portion (inner end portion) of the ventilation groove 15h is positioned higher than the other end portion (outer end portion).

  When such a ventilation groove 15h is formed, a ventilation path communicating with the outside air from the inside of the cylindrical insulator 14 can be formed via the ventilation hole 141, the gap 16, and the ventilation groove 15h. Therefore, in this case, the gap 16 may not be provided between the upper and lower electrode bodies 11 and 12 and the cover member 15.

  In addition, by positioning one end of the ventilation groove 15h higher than the other end in this way, it is possible to effectively prevent rainwater from entering the lightning pole member 1 via the ventilation groove 151. Can be suppressed.

  In addition, by arranging the ventilation grooves 15h radially in this way, the gas discharge function inside the lightning protection electrode member 1 in the event of a lightning strike can be made uniform as a whole.

(Consideration from test example)
When the installation height of the PDCE according to the present invention is flat and the height is 100 m or less, it is clear from the data in the field so far that the insulation distance H between the upper and lower electrodes is approximately 40 mm and is sufficiently effective. The discharge start voltage of the upper and lower electrodes at this time is about 100 kV at an atmospheric pressure of 760 mm · Hg of 20 ° C. Moreover, the appropriate discharge distance H is useful for reducing the weight of the product.

  However, when the installation height of the PDCE exceeds 100 m on a flat ground or at the top of a mountain, it is determined that the insulation distance H between the upper and lower electrodes is larger than that of the conventional product and is generally about 60 mm to 80 mm. When the discharge distance is 60 mm, the discharge start voltage under the same conditions is 140 kV, and when the insulation distance is 80 mm, the discharge start voltage is 170 kV.

  Also in Japanese Patent No. 3888846, if the discharge start voltage of the lightning rod is increased by any method, the lightning strike probability is greatly reduced, and the inventors of the present application have confirmed the effect in the PDCE in the field. We recognize that measures against rising will further improve the suppression effect.

  Specifically, the material of the cylindrical insulator 14 and the cover member 15 is suitably plastic, ceramic, insulator, rubber or the like having excellent strength and insulation. The tubular insulator 14 is provided with a vent hole 141 as a countermeasure against an increase in internal pressure during discharge, and has a structure that prevents an increase in internal pressure due to a lightning strike. Further, a gap 16 is provided between the cover member 15 and the cylindrical insulator 14 so that the internal pressure can be easily released to the outside. Further, protrusions and dents are provided on the upper and lower sides of the unit cover member 151 so that rainwater and the like are less likely to enter, and the unit cover members 151 are easily stacked on top and bottom.

  In the case of ceramic, the effect of water repellent treatment and dirt prevention can be obtained by externally applying glaze treatment in the same manner as ordinary insulators. Further, by providing a slight gap 17 between the cover member 15 and the upper electrode body 11, when installed in a high temperature place such as a chimney, the insulation resistance of the upper and lower electrodes is prevented from being reduced due to a decrease in the volume specific resistance of the cover member itself. Can do.

  With the above-described structure, it is possible to manufacture a lightning-reducing lightning rod (PDCE) according to the installation location with the same mold. When the cover thickness is about 20 mm, it is sufficient to use two under normal installation conditions, and when it is more than that, it can be handled by increasing the insulation distance H to three or four.

  In the above embodiment, the example in which the unit cover members 151 of the cover member 15 are stacked in two or four stages has been described, but the present invention is not limited to this. For example, three or more stages may be used. Further, the thickness, shape, contour, etc. of the unit cover member 151 may be arbitrarily modified as necessary. Basically, the structure is not particularly limited as long as rainwater does not easily enter the inside.

DESCRIPTION OF SYMBOLS 1 Lightning pole member 11 Upper electrode body 12 Lower electrode body 13 Insulator 14 Cylindrical insulator 141 Ventilation hole 15 Cover member 151 Unit cover member 15h Ventilation groove 2 Connection part 3 Support member 31 Support rod 32 Support pipe 33 Thread part A, B Lightning suppression type lightning arrester

Claims (7)

A lightning pole member having an insulator that insulates the upper electrode body and the lower electrode body, and a support member provided below the lightning pole member,
The insulator has a cylindrical insulator disposed between the upper electrode body and the lower electrode body, and a cover member disposed around the cylindrical insulator,
The lightning suppression lightning arrester, wherein the cover member is constituted by a plurality of unit cover members stacked.   The upper electrode body and the lower electrode body are connected by the cylindrical insulator, and a vent hole penetrating in a thickness direction of the peripheral wall is provided in a peripheral wall of the cylindrical insulator. Item 2. A lightning suppression type lightning arrester according to item 1.   The lightning-suppressing lightning arrester according to claim 2, wherein a gap is formed between the cylindrical insulator and the cover member, and the vent hole communicates with the gap.   The lightning-suppressing type lightning arrester according to any one of claims 1 to 3, wherein each unit cover member of the cover member is configured to be movable up and down. A ventilation groove is provided on at least one of the opposing surfaces of the unit cover member, and one end of the ventilation groove communicates with the gap, and the other end communicates with outside air. The lightning-reducing lightning arrester according to claim 3 .   The lightning-suppressing lightning arrester according to claim 5, wherein one end portion of the ventilation groove is positioned higher than the other end portion.   The lightning suppression lightning arrester according to claim 5 or 6, wherein a plurality of the ventilation grooves are provided, and each ventilation groove extends radially.

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