RU1805518C - Antenna ground electrode - Google Patents

Abstract

SUMMARY OF THE INVENTION: A ground electrode system comprises an electrode located in an aqueous electrolyte solution that fills a cavity in the ground. The shell separating the electrolyte solution from the surrounding soil in the upper part of the cavity is sealed and non-conductive, in the lower part of the cavity is permeable to electrolyte and has an ionic type of conductivity. 1 silt: 1 tab.

Description

The invention relates to equipment for cathodic protection of underground structures from corrosion and direct current transmission over a distance through a wire-to-ground system, and more particularly to positive polarity grounding devices, and is intended for use in the gas, oil and energy industries, as well as communal economy.

The purpose of the invention is to increase the service life and reduce operating costs.

The drawing shows a General view of the earthing.

The earthing switch consists of an electrode 1 equipped with a device 2, which provides the electrode with freedom of movement in an aqueous solution of electrolyte 3 filling the cavity 4 in the ground. The shell 5, which separates the electrolyte solution from the surrounding soil, is sealed and non-conductive in the upper part 6 of the cavity, and permeable to electrolyte in the lower part 7 of the cavity and has an ionic type of conductivity.

Anode grounding can be of various types (horizontal, vertical) and gives the greatest effect when applied in dense poorly conducting rocks, for example, rocky soils.

An increase in the service life of the earthing switch and a decrease in operating costs are provided by reducing and stabilizing the resistance to current spreading during operation.

The decrease in resistance is achieved by constant treatment of the borehole layers by the activator, and this treatment is carried out automatically during operation without additional external influences due to the diffusion of the electrolyte into the soil through the permeable to the electrolyte shell in the lower part of the cavity due to the process of electroosmosis that flows between the anode ground electrode and protected underground structure, as well as due to the difference in the concentration of electrolyte in the well and the surrounding soil. The electrolyte loss in the working part of the well due to diffusion into the soil is compensated by the influx from that hour

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those wells where the walls are sealed with a non-conductive, waterproof shell.

Due to the electrolyte diffusion process, the contact resistance at the shell-ground interface is stabilized, and the shell itself is not subjected to electrochemical dissolution during operation of the ground electrode. The stabilization of the contact resistance of the electrode-activator and the preservation of a constant working length of the electrode are achieved by diffusion of the electrolyte into the near-wellbore zone and the presence of a device providing the electrode with freedom of movement in the electrolyte. Depending on the parameters of the electrode and the type of ground electrode (horizontal, vertical), the device is either shock absorbers of various types (rubber, spring, etc.) or floats (air or special materials).

The presence of a shell having differentiated electrical conductivity along the length leads to a redistribution of the density of the flowing current along the length of the electrode and to an increase in the effect of the end current runoff, which contributes to more intensive destruction of the electrode in its lower part, this effect allows for long-term operation of the ground electrode by simple restoration of the working part of the electrode : as the lower part of the electrode dissolves and the diffusion process proceeds, the electrolyte level in the well decreases, the electrode due to the presence of The unit descends, while maintaining a constant working length. In this case, even micron displacements of the electrode relative to the electrolyte in any direction provide erosive cleaning of the electrode surface from corrosion products and gas film, which

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leads to stabilization of contact resistance at the electrode-activator interface.

The free movement of the electrode in the liquid activator makes it possible to replace it (i.e., restore the ground electrode) at the end of the electrode service life with minimal operational costs. The table shows the comparative characteristics of grounding conductors, known structures (prototype) and grounding conductor according to the invention.

The results given in the table clearly demonstrate the advantages of the proposed earthing switch. In the course of five years of operation, the current spreading resistance of an earthing switch of a known design increases 2.5-3 times, and in the earthing switch according to the invention, on the contrary, decreases 1.5-2 times and stabilizes after 2-3 years of operation.

In this case, the energy consumption for cathodic protection is reduced by 3-4 times in comparison with the known technical solutions.

Claims (1)

The claims An anode grounding device comprising an electrode located in an activator designed to fill a cavity formed in the soil and a shell serving to separate the activator from the soil, characterized in that, in order to increase the service life and reduce operating costs, an electrolyte is used as an activator. the electrode is made floating, while the shell in the upper part of the cavity is sealed from a non-conductive material, and in the lower part is made of a material with an ionic type of conductivity.