JP5839331B1 - Lightning suppression type lightning arrester - Google Patents

Abstract

By changing the insulator provided to cover between the peripheral edges of the upper and lower electrode bodies, it is possible to reduce the size of the apparatus and prevent discharge between the peripheral edges of the two electrode bodies. It is an object of the present invention to provide a lightning-suppressing type lightning arrester capable of discharging at a low pressure. A substantially bowl-shaped upper electrode body 2 and a lower electrode body 3 are interposed between a peripheral edge portion of the upper electrode body and a peripheral edge portion of the lower electrode, and they are in an insulated state at a predetermined interval. An insulator 4 to be connected and a support member 5 attached to the lower electrode body are provided, and the insulator is connected to the peripheral edge portion of the upper electrode body and the peripheral edge portion of the lower electrode body. A cylindrical portion 4a to be covered, an annular flange 4b provided on the inner periphery of the cylindrical portion, and a cover portion 4c provided on the outer periphery of the cylindrical portion and covering the outer periphery of the cylindrical portion are characterized. [Selection] Figure 2

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-type lightning rod (Franklin rod) and flow it to the ground.

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

  By the way, there is a demand for a smaller PDCE for the purpose of local lightning protection rather than protection of the wide area of the conventional PDCE, and the present inventors have conducted a study to meet that demand. I came to know the following problems.

  In other words, PDCE has a structure in which a certain gap is provided between the upper and lower electrodes because of its characteristic, so that a certain gap or more is provided between the upper and lower electrodes. For this purpose, protrusions that are opposed to each other are provided at the center of the two electrode bodies, and discharge is caused between these protrusions.

  However, if the size is reduced while maintaining the structure of the conventional PDCE, the bending of the upper and lower electrode bodies becomes smaller, and considering the fit of the insulating tube that connects them in an insulated state, the distance between the protrusions is larger than the distance between the two protrusions. It is assumed that the distance between the peripheral edges of the two electrode bodies becomes short, and discharge occurs at the peripheral edge prior to the center protrusion.

  In view of the above-described problems, the present invention changes the insulator provided to cover the periphery of the upper and lower electrode bodies, thereby reducing the size of the device and discharging the periphery between the both electrode bodies. It is an object of the present invention to provide a lightning suppression type lightning arrester capable of preventing discharge at a predetermined site.

In order to solve the above-described problems, a lightning suppression type lightning arrester according to the present invention is provided between a substantially bowl-shaped upper electrode body and lower electrode body, and a peripheral portion of the upper electrode body and a peripheral portion of the lower electrode body. An insulator that is connected to each other in an insulated state at a predetermined interval; and a support member attached to the lower electrode body, wherein the insulator includes a peripheral portion of the upper electrode body and the A cylindrical portion that is connected to a peripheral portion of the lower electrode body and covers between the peripheral portions, an annular flange provided on the inner periphery of the cylindrical portion, and an outer periphery of the cylindrical portion, A cover portion covering the outer periphery of the portion,
On the opposing surfaces of the upper electrode body and the lower electrode body, discharge protrusions are respectively provided,
The distance between the peripheral edge of the upper electrode body and the peripheral edge of the lower electrode body is set shorter than the distance between the discharge projections,
The distance from the peripheral edge of the upper electrode body to the peripheral edge of the lower electrode body through the inner peripheral edge of the flange portion of the insulator, and the outer peripheral edge of the cover portion of the insulator from the peripheral edge of the upper electrode body The distance from the first electrode to the peripheral edge of the lower electrode body is set to be larger than the distance between the discharge protrusions.

  With such a configuration, the insulation distance between the peripheral portions of the two electrode bodies is changed from the edge portion of one electrode body to the edge of the other electrode body through the inner edge of the flange portion and the outer edge of the cover portion. The length along the path to the part can be taken.

  Therefore, by appropriately setting the lengths of the collar and the cover, it is possible to control the discharge between the peripheral portions of the two electrode bodies by setting the insulation distance between the peripheral edges of the two electrode bodies to a sufficient length. it can.

  When discharge protrusions are provided on the respective opposing surfaces of the upper electrode body and the lower electrode body, the distance between these discharge protrusions is such that the distance from the peripheral edge of the upper electrode body to the inner edge of the insulator The distance from the peripheral edge to the peripheral edge of the lower electrode body is smaller than the distance from the peripheral edge of the upper electrode body to the peripheral edge of the lower electrode body through the outer peripheral edge of the cover portion of the insulator. By setting, discharge between the peripheral portions of both electrode bodies can be prevented, and discharge between the projections set as discharge locations can be performed.

An annular groove that goes around the periphery of both the electrode bodies is provided in the periphery of the upper electrode body and the periphery of the lower electrode body, respectively, and the upper and lower ends of the cylindrical portion are press-fitted or inserted into these annular grooves, respectively. It is preferably fixed by adhesion .

  According to the lightning-suppressing type lightning arrester of the present invention, when the distance between parts of the two electrode bodies other than the part to be discharged is reduced by downsizing, the insulator that connects them in an insulated state, The insulation distance between parts other than the part which should perform the said discharge can be adjusted, and the discharge between these parts can be prevented.

It is a front view showing one embodiment of the present invention. It is a disassembled perspective view which shows one Embodiment of this invention. It is a longitudinal cross-sectional view which shows one Embodiment of this invention. It is the schematic of the experimental apparatus for verifying a lightning protection effect. It is a table | surface which shows the result of the lightning strike experiment of a stylus type lightning rod (Franklin rod). It is a table | surface which shows the result of the lightning strike experiment of one Embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a lightning-suppressing lightning arrester according to the present embodiment. The lightning-suppressing lightning arrester 1 includes an upper electrode body 2, a lower electrode body 3, and the upper electrode body 2. Between the peripheral portion of the lower electrode 3 and the peripheral portion of the lower electrode 3 and connecting them in an insulated state at a predetermined interval, and a support member 5 attached to the lower electrode body 3 The insulator 4 is connected to the peripheral edge of the upper electrode body 2 and the peripheral edge of the lower electrode body 3, and covers the space between the peripheral edges, and the cylindrical portion 4a An annular flange 4b provided on the inner periphery and a cover 4c provided on the outer periphery of the tube portion 4a and covering the outer periphery of the tube portion 4a are provided.

  More specifically, as shown in FIG. 3, annular grooves 2a and 3a are respectively formed in the peripheral portions of the upper electrode body 2 and the lower electrode body 3, and the annular grooves 2a and 3a are formed in the annular grooves 2a and 3a, respectively. The upper and lower ends of the cylindrical portion 4a of the insulator 4 are inserted respectively.

  And each end part of the said cylinder part 4a is integrated with each said electrode body 2 * 3 by press-fitting in each said annular groove 2a * 3a, or adhesion | attachment, and both these electrodes 2 and 3 are connected in an insulated state.

  On the other hand, at the center of the inner surface of the upper electrode body 2 and the lower electrode body 3, in the state where these electrode bodies 2 and 3 are connected, the protrusions 2b and 3b facing each other with a predetermined distance L project integrally. In addition, each tip has a hemispherical shape.

  Further, the support member 5 attached to the lower electrode body 3 fixes the support rod 6 screwed to the lower electrode body 3 from the lower surface side, and the support rod 6 and the lower electrode body 3 are fixed. The upper fixing means 7 and the lower fixing means 8 for fixing the lower part of the support rod 6 to the installation position are constituted.

  The upper fixing means 7 is a male screw 6a formed on the support rod 6 and screwed into a screw hole 3c formed so as to extend from the lower surface of the lower electrode body 3 into the projection 3b. And an upper nut for fixing the lower electrode body 3 to the upper portion of the support rod 6 by being screwed to the male screw 6a and being pressed against the lower surface of the outer lower electrode 3 via a washer 9. 10.

  The lower fixing means 8 is constituted by a pair of nuts 11 screwed into a male screw 6 b formed at the lower part of the support rod 6, and a connecting plate 12 sandwiched between these nuts 11. ing.

  The lightning-suppressing type lightning arrester 1 according to this embodiment is fixed to the installation position via the connection plate 12.

  On the other hand, the cylindrical portion 4a constituting the insulator 4 is formed such that the thickness of the peripheral wall thereof is slightly thicker than the width of the annular grooves 2a and 3a provided at the peripheral edges of the electrode bodies 2 and 3, The electrode bodies 2 and 3 are connected to each other by being fitted into the annular grooves 2a and 3a in a press-fitted state or by being bonded using an adhesive or the like.

  And the said cylinder part 4a opposes said protrusion 2b * 3b provided in the inner surface of these electrode bodies 2 * 3 in the state which connected both said electrode bodies 2 * 3, and these space | intervals are The electrode bodies 2 and 3 are connected so that a predetermined distance L is obtained.

  And the said collar part 4b provided continuously by the inner periphery of the said cylinder part 4a is cyclically | annularly formed by predetermined thickness, and the internal diameter of the opening part inside is protrudingly provided by each said electrode body 2.3. The protrusions 2b and 3b are formed to have a slightly larger outer diameter.

  Further, the cover portion 4c provided continuously on the outer periphery of the cylindrical portion 4a is inclined downward from the upper end portion of the outer surface of the cylindrical portion 4a and gradually separated from the outer surface of the cylindrical portion 4a. The lower end of the cylindrical portion 4a is substantially equal to the lower end of the cylindrical portion 4a.

  Therefore, the insulator 4 that connects the electrode bodies 2 and 3 covers the gap between the peripheral portions in a state in which the electrode bodies 2 and 3 are connected, and further, the outside is covered with the cover portion. Covered by 4c.

  In the present embodiment, the sum (distance X) of the distance between the inner peripheral edge of the flange 4b and the peripheral edges of the electrode bodies 2 and 3 is larger than the distance L between the protrusions 2b and 3b. The width of the flange portion 4b is set, and similarly, the sum (distance Y) of the distance between the outer peripheral edge of the cover portion 4c and the peripheral edge of each of the electrode bodies 2 and 3 is between the protrusions 2b and 3b. The length of the cover portion 4c is set so as to be larger than the distance L.

  Therefore, in the present embodiment, a portion having the shortest insulation distance between the upper and lower electrode bodies 2 and 3 is set between the protrusions 2b and 3b provided on the inner surfaces thereof.

  Here, the portion where the insulation distance is shortest, that is, the discharge is performed between the projections 2b and 3b. Since the insulation strength at this portion needs to be secured to a certain level or more, the above-described projection 2b. -Narrowing the distance L between 3b is restrict | limited.

  Under this premise, if the overall size of the lightning suppression type lightning arrester 1 is to be reduced, the shape of the electrode bodies 2 and 3 is inevitably maintained while the distance L between the protrusions 2b and 3b is secured. Must be reduced.

  However, if the shape of both the electrode bodies 2 and 3 is reduced under such conditions, the distance between the parts other than the part provided with the protrusions 2b and 3b approaches, and the distance is determined by the both protrusions. It becomes shorter than the distance L between 2b and 3b.

The portion where such a phenomenon occurs is the peripheral edge of both the electrode bodies 2 and 3.
However, in this embodiment, as described above, the insulation distance X · Y between the electrode bodies 2 and 3 is between the protrusions 2b and 3b by the flange portion 4b and the cover portion 4c of the insulator 4. It is set larger than the distance L.

  Therefore, even in the lightning suppression type lightning arrester 1 of the present embodiment that has been downsized, the discharge site can be between the both protrusions 2b and 3b provided on the both electrode bodies 2 and 3, It is possible to prevent discharge at other parts.

  In this way, by discharging only at a predetermined portion, for example, when discharge is performed between the peripheral edges of the electrode bodies 2 and 3, the discharge is interposed between them. Although a problem such as damage to the joints between the insulator 4 and the electrode bodies 2 and 3 is assumed, such a problem is avoided.

  On the other hand, in the present embodiment, the flange portion 4b and the cover portion 4c are formed integrally with the cylindrical portion 4a. However, these portions are formed separately and can be formed by means such as press-fitting or adhesion. Can also be integrated.

  The lightning suppression lightning arrester 1 according to the present embodiment configured as described above is used for lightning suppression like a conventional PDCE.

  Here, in order to confirm the lightning protection effect of the lightning suppression type lightning arrester 1 of the present embodiment, a comparison with a pointed lightning type lightning rod was performed using the experimental device shown in FIG.

  In this experimental apparatus, a metal plate 21 is installed on a floor 20 of a laboratory at a distance A (2.2 m), and is located below the metal plate 21 at a height B (1 m) from the floor 20. A lightning arrester is installed, and a voltage (for example, 650 kV or 620 kV) that generates discharge is repeatedly applied between the floor 20 and the metal plate 21.

  The discharge situation in the lightning arrester when the voltage was repeatedly applied 30 times was measured, and the results are shown in FIGS.

FIG. 5 shows the results regarding the lightning rod type lightning rod. 30 discharges were confirmed with respect to 30 voltage applications.
On the other hand, in the lightning suppression type lightning arrester 1 of the present embodiment, as shown in FIG. 6, no discharge is seen with respect to 30 times of voltage application, and a good lightning protection effect can be obtained. confirmed.

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

DESCRIPTION OF SYMBOLS 1 Lightning strike suppression lightning arrester 2 Upper electrode body 2a Annular groove | channel 2b Protrusion 3 Lower electrode body 3a Annular groove | channel 3b Protrusion 3c Screw hole 4 Insulator 4a Cylindrical part 4b Gutter part 4c Cover part 5 Support member 6 Support rod 6a Male screw 6b Male Screw 7 Upper fixing means 8 Lower fixing means 9 Washer 10 Upper nut 11 Nut 12 Connecting plate 20 Floor 21 Metal plate

Claims (4)

Insulation that is interposed between a substantially saddle-shaped upper electrode body and lower electrode body, and a peripheral edge portion of the upper electrode body and a peripheral edge portion of the lower electrode body , and connects them in an insulated state at a predetermined interval. A body, and a support member attached to the lower electrode body,
The insulator is connected to a peripheral portion of the upper electrode body and a peripheral portion of the lower electrode body, and covers a cylindrical portion covering between the peripheral portions, and an annular flange provided on the inner periphery of the cylindrical portion. A cover portion provided on the outer periphery of the tube portion and covering the outer periphery of the tube portion,
On the opposing surfaces of the upper electrode body and the lower electrode body, discharge protrusions are respectively provided,
The distance between the peripheral edge of the upper electrode body and the peripheral edge of the lower electrode body is set shorter than the distance between the discharge projections,
The distance from the peripheral edge of the upper electrode body to the peripheral edge of the lower electrode body through the inner peripheral edge of the flange portion of the insulator, and the outer peripheral edge of the cover portion of the insulator from the peripheral edge of the upper electrode body A lightning-suppressing lightning arrester characterized in that a distance from the discharge electrode to the peripheral edge of the lower electrode body is set to be larger than a distance between the discharge projections. The peripheral edge of the upper electrode body and the peripheral edge of the lower electrode body are respectively provided with annular grooves that circulate along the peripheral edges of the two electrode bodies, and the upper and lower ends of the cylindrical portion are provided in these annular grooves. The lightning-suppressing type lightning arrester according to claim 1, wherein the lightning-reducing device is fixed by press-fitting or bonding .   The lightning-suppressing lightning arrester according to claim 1 or 2, wherein the flange portion or the cover portion is formed integrally with the cylindrical portion. The lightning-suppressing lightning arrester according to any one of claims 1 to 3, wherein the flange portion or the cover portion is integrated with the cylindrical portion by adhesion.