JPH0141171Y2 - - Google Patents

Description

[Detailed explanation of the invention] Industrial application field This invention is a system that guides the surge voltage induced in power transmission lines by lightning to the grounding point using a lightning arrester, discharges it into the ground, and protects facilities such as power plants and substations. This invention relates to a grounding electrode with a needle used for protection.

BACKGROUND ART Conventionally, Japanese Utility Model Publication No. 56-49104 is known as a grounding electrode that can quickly discharge the surge voltage caused by lightning into the ground and obtain a sufficient safety effect.

Problems to be solved by the invention The above-mentioned Utility Model Publication No. 56-49104 has a plurality of needle-shaped second electrode parts radially fixed to a long rod-shaped first electrode part, so it cannot be easily installed. This caused problems in transporting and handling the material to the site, and also caused problems in burying it in the ground.

Means for Solving the Problem This invention consists of a first electrode part in the form of a long rod having a conical shoe member at the tip, and a first electrode part which is pivotally connected to the first electrode part so as to be able to stand up and fall down, and is constantly provided with a spring to provide an upright force. A plurality of needle-shaped second electrode portions provided with the above-mentioned needle-shaped second electrode portions are removably inserted into the first electrode portion, and the second electrode portions are stored and held in a laid-down state, and are pulled out and removed after being driven into the ground. It consists of a cylindrical driving tool.

Function: In this device, the driving tool stores and holds the needle-shaped second electrode part in a laid down state, and pulls it out and removes it after driving into the ground, so that the needle-shaped second electrode part is given an upright force by the action of the spring. , and stands up against the first electrode part by itself by the spring or with the assistance of further insertion or withdrawal of the first electrode part, and when a surge voltage occurs,
Due to the generation of a high potential gradient area at the acicular tip of the second electrode part, rapid electron injection occurs from the acicular tip into the ground, which further develops into a rapid discharge from an electron avalanche to an underground streamer. However, in conjunction with the contact discharge from the first electrode portion, the initial discharge amount is rapidly increased, the surge voltage is quickly extinguished, and the facility is protected.

Embodiment The drawings show an embodiment of the present invention.
1 is a first electrode portion, 2 is a second electrode portion, and 3 is a driving tool.

The first electrode portion 1 is made of a metal material having corrosion resistance and conductivity (e.g., stainless steel, corrosion-resistant plated iron, or other conductive metal) and is shaped like a long rod, and the cross-sectional shape is circular. However, it may also be square.

The second electrode part 2 is made of the same material as the first electrode part 1 and is formed into a needle shape. A plurality of the second electrode parts 2 are pivotally attached to the first electrode part 1 so as to be able to stand up and fall down, and are constantly given an upright force by a spring 4. ing.

Attachment holes 5 are formed in the first electrode portion 1 at equal intervals in the longitudinal direction thereof. This mounting hole 5
are formed through the first electrode portion 1 in a direction perpendicular to the longitudinal direction thereof.

A small hole 7 for mounting a hinge pin 6 is formed in the mounting hole 5, and cutout steps 8 are formed on the outer surfaces of both ends of the small mounting hole 7.

The distal end 2a of the second electrode portion 2 has a sharp conical shape, and the proximal end 2b has an insertion hole 2 for the hinge pin 6.
c is formed. Although the insertion hole 2c is shown as being formed by circularly winding the base end portion 2b of the second electrode portion 2, the insertion hole 2c may be formed by flattening the base end portion 2b.

The second electrode part 2 is pivotally mounted at its base end 2b together with a spring 4 in the mounting hole 5 of the first electrode part 1 by a hinge pin 6 so as to be able to rise and fall.

The spring 4 is wound around the hinge pin 6,
Although a coil-shaped one is shown in which one end is locked to the second electrode portion 2 and the other end is brought into contact with the mounting hole 5, a plate-shaped one may also be used.

The second electrode portion 2 is caused by the spring 4 to
An erecting force is always applied to the first electrode portion 1 so that the first electrode portion 1 stands up substantially at right angles to the longitudinal direction thereof, and is configured such that a portion of the mounting hole 5 serves as a stopper and can be held in this state.

A storage groove 9 is formed in the first electrode portion 1 in correspondence with the laid down position of the second electrode portion 2, and this storage groove 9 allows the second electrode portion 2 to be placed in the laid down position.
The second electrode portion 2 is designed not to protrude from the outer periphery of the first electrode portion 1, or to minimize the protrusion.

The attachment interval of the second electrode part 2 in the longitudinal direction of the first electrode part 1 is made slightly larger than the length dimension of the second electrode part 2. Furthermore, the mounting direction of the second electrode part 2 with respect to the first electrode part 1 is shown as being mounted in a staggered manner at symmetrical positions at 180° intervals; In addition, at each longitudinal position of the first electrode portion 1, there are four at 90° intervals or three at 120° intervals;
Alternatively, two may be installed at 180° intervals.

A conical shoe member 10 made of the same material as the first electrode portion 1 is attached to the tip portion 1a of the first electrode portion 1 in order to reduce the driving resistance. It may be formed integrally with.

The driving tool 3 is inserted into and removed from the first electrode portion 1 and is used to store and hold the second electrode portion 2 in a laid down state, and the driving tool 3 has the same longitudinal dimension as the first electrode portion 1 as a whole. The cross-sectional shape is cylindrical in the drawing, and the inner diameter is slightly larger than the outer diameter of the first electrode portion 1, but the cross-sectional shape of the first electrode portion 1 is rectangular. In this case, the driving tool 3 also has a similar shape and a slightly larger rectangular cylindrical cross section.

The driving tool 3 is made of a material strong enough to withstand driving (for example, a hard pipe material such as a steel pipe), and has a handle 11 attached to its upper end.

The driving tool 3 is transported to the installation site with the driving tool 3 extrapolated onto the first electrode part 1 to prevent damage to the second electrode part 2 and to ensure the safety of the operator. A conductive paste is applied to the pivot joint of the second electrode portion 2.

At the installation site, driving work is carried out with the driving tool 3 extrapolated, and when the driving tool 3 is driven to a predetermined depth, only the driving tool 3 is pulled out and removed using the handle 11. As a result, if the soil is soft, the second electrode portion 2 will be able to stand up by itself due to the restoring elastic force of the spring 4. When the soil is hard, after pulling out the driving tool 3, if the first electrode part 1 is driven in a little further, the second electrode part 1 is driven in with the help of the spring 4.
The electrode portion 2 can be erected by the resistance of the soil.

In the embodiment shown in the drawings, the second electrode portion 2 is rotated in the direction toward the tip of the first electrode portion 1, but it may also be in the opposite direction, and in this case,
If the second electrode portion 2 cannot be erected by itself after being driven into the ground, the first electrode portion 1 may be slightly pulled out.

Furthermore, the embodiment shown in the drawings shows a case in which a mounting hole 5 is provided in the first electrode part 1 for mounting the second electrode part 2, but instead of this mounting hole 5, a prong-shaped bracket is provided. Attachment, the second electrode part 2 is pivotally attached to this bracket so that it can be raised and lowered, and a spring 4 is always applied with a rising force.
With this, the storage groove 9 can also be omitted,
In this case, the outer diameter of the conical large diameter end of the shoe member 10 may be made slightly larger than the inner diameter of the driving tool 3.

Effects of the invention According to this invention, it is possible to prevent damage to the second electrode part during transportation to the installation site, storage, etc., and to ensure the safety of the operator. It is easy to carry out, and of course, as a grounding electrode with a large initial discharge amount, it can effectively protect the facilities of power plants and substations against surge voltages caused by lightning and the like.

[Brief explanation of drawings]

Figure 1a is a schematic front view when driving into the ground, Figure 1b is a schematic front view when the driving tool is being pulled out,
Figure 2 is a front view of the driving tool alone, Figure 3 is a front view of the first and second electrode parts with the driving tool removed, and Figure 4 is an enlarged cross-sectional plan view of the pivoting part of the second electrode part. , FIG. 5 is an enlarged longitudinal sectional front view of the pivoting portion of the second electrode portion. 1...First electrode part, 2...Second electrode part, 3
...A driving tool.

Claims (1)

[Scope of utility model registration request] A long rod-shaped first member having a conical shoe member at the tip.
an electrode portion, a plurality of needle-shaped second electrode portions which are pivotally connected to the first electrode portion so as to be able to stand up and fall down and are constantly applied with an erecting force by a spring; and a plurality of needle-shaped second electrode portions which are removably inserted into the first electrode portion. and a cylindrical driving tool for storing and holding the second electrode part in a laid-down state and pulling it out and removing it after driving it into the ground.