RU148646U1 - ACTIVE GROUNDER (AVG) USING THE AVGaktiv MULTICOMPONENT CONDUCTIVE MIXTURE - Google Patents

Abstract

An active ground electrode system containing vertical electrodes screwed into the ground, which are perforated at the bottom of the pipe, and a conductive filler poured into the pipes, characterized in that the pipes are made of galvanized or non-galvanized steel, and a corrosion-inactive multicomponent mixture is used as the specified filler based on AVGaktiv graphite in the liquid phase.

Description

The present invention relates to the field of electric power and industry.

Electrolytic grounding electrodes are known from the prior art, which consist of perforated pipes in the lower part made of stainless materials into which an electrolytic solution based on sodium chloride is poured (US 6515220 B1, publ. 4.02.2003). Their installation is carried out in a drilled well filled with a graphite-concrete mixture. During operation, the electrolytic solution diffuses into the surrounding soil, thereby achieving an increase in the volume of the medium with increased conductivity and a decrease in the resistance to spreading of the ground electrode.

Closest to the claimed technical solution are electrolytic grounding electrodes (Moisture collecting grounding electrode US 6515220 B1, publ. 4.02.2003). The disadvantage of this technical solution is the complexity of the installation, the high cost of the electrodes and the need for maintenance. The reasons for this are:

1. The large diameter of the electrodes, requiring the installation of drilling work.

2. The use of expensive corrosion-resistant metal grades as electrode materials.

3. The use of electrolytic filler, which is a corrosive medium, which can adversely affect the elements of grounding devices.

4. The use of expensive types of welding for connecting electrolytic grounding electrodes with other elements of the grounding device (for example, exothermic welding).

5. The need for periodic maintenance with topping up the electrolytic filler, or installing an appropriate device for such topping up.

The task to which the invention is directed is to reduce the cost of electrodes, reduce the cost of installing grounding conductors, eliminating the need for their maintenance.

The solution to this problem is achieved by applying the following technical solutions:

1. Instead of electrolytic filler, graphite-based filler is used. The specified filler is not corrosive, as a result of which it does not pose a danger to the elements of the grounding device. The specified technical solution allows the use of less corrosion-resistant metals as electrode materials.

2. Pipes made of non-galvanized or galvanized steel are used as electrodes.

3. The use of electrode welding instead of the more expensive types of welding.

4. Pipes of smaller diameter, perforated in the lower part, allowing them to be installed without the use of drilling, are used as electrodes.

The technical results provided by the given set of features are: reduction in the cost of the ground electrode; reduction of costs for its installation, lack of costs for its maintenance.

The invention is illustrated by drawings, which depict:

In FIG. 1 - Installation of an active ground electrode;

In FIG. 2 - Pouring a multicomponent mixture;

In FIG. 3 - Crown (drill for screwing the ground electrode into the ground);

In FIG. 3a - specification of the crown;

In FIG. 4 - Sleeve;

In FIG. 5 - Casing;

In FIG. 6 - Shank

In FIG. 7 - Injector stem;

In FIG. 8 - Injector head;

In FIG. 9 - Assembly drawing of an earthing switch

In FIG. 9a - Earthing switch assembly drawing specification

The device operates as follows. The assembled ground electrode system (Fig. 9), consisting of a Crown (Fig. 3), Bushing (Fig. 4), Casing (Fig. 5) and Shank with a sleeve (Fig. 6) is screwed into the ground using a hammer drill. After the earthing switch is installed, the shank is removed. After that, another Coupling and Casing pipe are installed on the ground electrode system screwed into the ground in order to increase the length of the installed ground electrode system (two sections add up to ~ 3 meters). A Shank is also installed on the free end of the Casing and the ground electrode is screwed into the ground again. After completion of work, the Shank is removed. As a result, we get a vertical ground electrode installed in the ground to a depth of ~ 3 meters.

After installing the vertical electrodes in the soil, the AVGactiv multicomponent mixture is poured into the ground electrode pipe in the liquid phase.

The composition of the multicomponent mixture "AVGactiv" includes:

- Conducting composition: 90-95%. As a conductive composition, graphite or pyrolytic graphite in finely dispersed form is used.

- Hardener: 5-10%. Cement is used as a hardener.

To obtain the liquid phase of the AVGactiv mixture, it is mixed with water in the mixture / water ratio: 1: 3-1: 4 by volume.

After pouring, the mixture is injected using the injector rod (Fig. 7) with the injector head attached (Fig. 8). This allows the mixture to penetrate the soil through the perforated holes of the grounding pipes. As a result of the spreading of the AVGactiv multicomponent mixture on the ground, full contact is made between the external and internal surfaces of the grounding system with the soil, the voids formed by vibration during penetration by a perforator are filled, repeatedly increasing the conductive surface due to propagation through cracks and voids in the soil, additionally creating a volume conductive surface. As a result, the contact area of the ground electrode with soil increases, thereby reducing its resistance to spreading. After the mixture hardens, it keeps its conductive properties unchanged over time.

The use of active grounding conductors is supposed to be at facilities (power plants, substations, power transmission towers, industrial facilities) located in areas with high soil resistivity, where it is difficult to reach conventional grounding equipment with the ability to spread the grounding device regulated by normative and technical documentation, and the use of electrolytic grounding electrodes leads to significant costs.

The developed utility model is planned to be installed on the overhead line supports of 110, 35 and 6 kV networks of Gazpromneft-NNG OJSC and Gazpromneft-Khantos LLC. The use of active grounding conductors (AVG) using the multi-component conductive mixture “AVGactiv” will reduce the resistance to spreading of the grounding devices of the supports of overhead lines and substations to the values regulated by the normative and technical documentation, thereby increasing the lightning stability of the lines and substations and reducing the number of emergency shutdowns.

Claims (1)

An active ground electrode containing vertical electrodes screwed into the ground, which are perforated at the bottom of the pipe, and a conductive filler poured into the pipes, characterized in that the pipes are made of galvanized or non-galvanized steel, and a corrosion-inactive multicomponent mixture is used as the specified filler based on AVGaktiv graphite in the liquid phase.

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