RU1778833C - Anode grounding device - Google Patents

Abstract

SUMMARY OF THE INVENTION: An anode earthing conductor consisting of a long wire conductor made of metal, coated with a dielectric film when the anode current flows, for example titanium, placed along the anode earthing conductor, to which low-wearing-out rod electrodes of the same metal are welded with a certain step along a coaxial helix, coated with a layer of manganese dioxide with a thickness of 500 microns, at an angle of 30 - 45 °; to the axis of the current lead, wherein all the electrodes can be located in two vertical planes, the angle between which is 90 °, or in three vertical planes, the angles between which are 60 °. When an anode ground electrode is placed in a vertical well, a mounting weight is attached to the lower end of the current lead to allow the anode ground electrode to freely run into the well. 2 ill.

Description

The invention relates to cathodic protection of underground structures against corrosion and direct current power transmission through a wire-to-ground system, and in particular to direct current grounding devices, and will find application in many industries.

An anode earthing device is known, comprising rod electrodes connected in series to each other, the electrical connection between which is carried out in vertical wells due to their direct contact and the weight of the electrodes located above.

The disadvantage of this ground electrode is the high consumption of electrode material, since sufficient mass of each electrode is required for reliable contact.

Closest to the technical nature of the proposed is the anode for

cathodic protection of pipes, comprising an elongated insulated conductive rod, on the outer surface of which pins of a film-forming metal are installed along its entire length; an example of titanium contacting through an insulation layer with a rod.

The disadvantage of this anode is the low reliability due to the fact that absolutely reliable isolation of the contact point of the electrode-pin with the rod is required, otherwise this place is quickly destroyed by current leakage.

The purpose of the invention is to increase the reliability of the anode ground electrode system. This increases the service life of the earthing switch.

This goal is achieved by the fact that in the anode

 an earthing switch containing bar electrodes made on the basis of a metal coated with a dielectric film

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when the anode current is flowing, electrically connected to an insulated conductor placed along the ground electrode, it is new that the conductor is made of metal coated with a dielectric film when the anode current flows, and the electrodes are attached to the conductor at an acute angle along the helix.

In FIG. 1 and 2 show the anode earthing switch, vertical and transverse sections.

In a vertical well 1 (Fig. 1} with a diameter of 150 mm and a depth of 30 m, a rod (10 mm in diameter) conductive wire 2 of titanium (or other film-forming metal when forming the anode current, for example, of niobium, tantalum) was lowered to which a product line having a pitch of 500 mm is welded with a pitch along the axis of current lead 2 equal to 83 mm, at an angle of 45 ° to the axis of current lead 2 rods 3 with a diameter of 3 mm and a length of 100 mm of the same metal, coated with a layer of an anodic resistant electrically conductive coating of manganese dioxide 0.5 mm thick (or other wear-resistant coating, for example p, from platinum, ruthenium or iridium dioxide with a thickness of 3-20 μm.) An assembly weight 4 of 10-20 kg mass is attached to the lower end of the current lead 2, which serves to lower the anode into the well 1 by gravity, and to the upper end of the current lead 2 the power cable 5 is connected using a cable sleeve 6. After installation, the well 1 is filled with clay soil 7. With the above step of the helix on the surface of the current lead 2 and the step of placing the electrodes 3 along the length of the helix, all electrodes 3 are uniformly located in three vertical planes, anglesbetween which is 60 ° (Fig. 2).

The earthing device works as follows. When a constant electric lead is fed through the supply cable 5, the current through the coupling 6 flows into the current lead 2, from it to the electrodes 3 and from the latter flows into the ground. When exposed to air and

Anodic polarization film-forming metals are coated with a dielectric oxide film, preventing the flow of anode current from these metals. Therefore, the current lead 2. The uncovered portions of the electrodes 3 and the places of their connection with the current lead 2 do not undergo anodic dissolution, and therefore do not need to be isolated from the environment. This greatly increases the reliability of the ground electrode and simplifies its design.

The proposed arrangement of the electrodes along a helical line at an acute angle to the axis of the current lead allows, in addition, with a minimum number of electrodes to significantly reduce the spreading resistance of the ground electrode in comparison with the prototype, which reduces material costs. This spatial orientation of the electrodes was established by theoretical analysis.

current lines and experimental studies on the model.

Claims (1)

SUMMARY OF THE INVENTION An anode earthing switch comprising rod electrodes made on the basis of a metal coated with a dielectric film during the drainage of the anode current, electrically connected to an insulated current lead placed along the ground electrode, characterized in that, in order to increase reliability, the lead wire is made of metal coated with a dielectric film during the drainage of the anode body, electrodes attached to a conductor at an acute angle along a helix. FIG. i. FIG. 2