JPH05198321A - Grounding resistance reducing material - Google Patents

Abstract

PURPOSE:To enlarge the contact area with the soil to enlarge the reducing effect of the grounding resistance by scattering only small pieces of the reduction agent in the surrounding of a grounding electrode or mixing the resistance reduction agent for scattering. CONSTITUTION:A grounding electrode 3 is buried under the ground horizontally, and the reduction materials A are distributed in the surrounding of the grounding electrode 3. The reduction agent 4 is a conventional one, and the new reduction agent A made of an excellent conductor is scattered thereon, and the grounding electrode 3 is placed thereon, and furthermore, the soil is heaped thereon. The grounding area is effective within the periphery of the area, where the reduction agent is distributed, independently from the shape of the grounding electrode 3 by scattering only the pieces of the reduction agent in the surrounding of the grounding electrode or mixing the resistance reduction agent for scattering. As a result, since the contact area with the soil is enlarged, the reducing effect of the grounding resistance is enlarged. This reduction agent A is made of a hollow fragments piece, which is made of copper plate or stainless steel plate having the excellent conductivity and the corrosion resistance and which consists of a hollow part 1 and a flange part 2 in the edge thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground resistance reducing material.

[0002]

2. Description of the Related Art Conventionally, as a ground resistance reducing material, a reaction material mainly composed of sodium silicate, non-reacting minerals such as bentonite and salt, processed materials such as carbon powder and charcoal, and a mixture thereof are used. . All of these substances have significantly higher specific resistance than the metal body, and only have the equivalent effect of increasing the ground contact area by keeping the wet state by adsorbing moisture in the soil, and have the same reducing effect as the metal body. I couldn't expect it.

[0003]

The conventional reducing agent uses an insulator or a high resistance material as described above, and utilizes the hygroscopicity in the ground to keep the periphery of the ground electrode in a wet state. The present invention aims to reduce the resistance, while providing a ground resistance reducing material capable of reducing the ground resistance by positively increasing the ground area by using itself as a good conductor.

[0004]

[Means for Solving the Problems] A metal, which has good conductivity, is formed into a hollow shape to reduce its apparent specific gravity. It is composed of an aggregate, which is scattered around the ground electrode to reduce the resistance. I made it smaller. Alternatively, a resistance reducing agent was further mixed to enhance the resistance reducing effect.

[0005]

Embodiments will be described with reference to the drawings. FIG. 1 shows a first embodiment. The ground resistance reducing material A is formed by using a copper plate or a stainless steel plate having excellent conductivity and corrosion resistance as a material, and
It is a hollow strip made up of and its edge flange portion 2.

By scattering such a grounding resistance reducing material to a required thickness around the grounding electrode such as a strip, plate or rod buried in the ground, the grounding electrode and the reducing material and the reducing material are separated from each other. The metal is electrically joined to the metal, and the current flows without resistance to the outermost reducing material portion.

7 and 8 show an example in which the ground electrode 3 is horizontally embedded in the ground, and the reducing material A is sprinkled around the ground electrode 3. Reference numeral 4 is a conventional reducing material, and in the example of FIG. 7, the reducing material of the present invention is sprinkled on this, the grounding electrode 3 is placed, and the soil is further heaped thereon. Further, in the case of FIG. 9, the ground electrode 3 is vertically embedded, and in this case, the reducing material A is filled around the vertical direction of the ground electrode 3. In this case, of course, in addition to the reducing material A of the present invention, a conventional reducing material may be mixed.

2 to 6 show another example of the reducing material, and FIG.
In the case of No. 2, the strips shown in FIGS. 3 and 4 are strips of which both ends are flatly compressed while leaving the center of the strip of FIG. 2 as it is.

In the case of FIG. 5, a thin plate is rolled into a cylindrical shape, and in FIG. 6, a hollow tetrahedron like a milk pack made of paper is used and the opening is crimped.

[0010]

[Effect] By spreading the above-mentioned strip of reducing material only around the grounding electrode or by mixing with a resistance-reducing agent, the grounding area can be spread regardless of the electrode shape. It will be effective until then, and as a result, the contact area with soil will be large, and the effect of reducing ground resistance will be great.

Since it has a hollow shape, it has a small apparent specific gravity in the volume and is easy to carry and load. Depending on the shape, it is possible to make the specific gravity of the material 1/10 or less.
By embedding a large number of them, a large number of minute protrusions are formed, and the lightning current can be quickly released into the soil. That is, the effect of reducing the surge impedance becomes great.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment of a reducing material.

FIG. 2 is a perspective view of a second embodiment of a reducing material.

FIG. 3 is a perspective view of a reducing material according to a third embodiment.

FIG. 4 is a sectional view taken along line III-III.

FIG. 5 is a perspective view of a fourth embodiment.

FIG. 6 is a perspective view of a fifth embodiment.

FIG. 7 is a cross-sectional view showing a state in which a grounding electrode is buried using a reducing material.

FIG. 8 is a plan view of FIG.

FIG. 9 is a cross-sectional view showing a state in which a ground electrode is vertically embedded.

[Explanation of symbols]

 A Ground resistance reduction material 1 Hollow part 2 Flange part 3 Ground electrode 4 (Conventional) reduction material

Claims (2)

[Claims] 1. A ground resistance reducing material comprising an aggregate made of a metal having a good conductivity and formed in a hollow shape to have a small apparent specific gravity. 2. The ground resistance reducing material according to claim 1, wherein a ground resistance reducing agent is mixed.