RU2561194C2 - Anode earthing electrode - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention is referred to electric engineering and may be used for anodic earthing of cathode protection units from the corrosion of steel and reinforce concrete steel structures contacting soil, river and sea water and other electrolytic means. An anode earthing electrode comprises a body 1 made as a shell of a thin (thickness of 0.1-0.4 mm) galvanised steel sheet. The central electrode 3 is made of graphite-reinforced plastics and surrounded by an activating material 2 shaped as a cylinder and based on a compound of an electroconductive, granulated porous loose material, and graphite chips with the size of 10-15 mm are used as the above material.

EFFECT: invention allows an increase of service life for the anode earthing electrode, reduced rate and increased uniformity of electrode solution.

4 cl, 1 dwg

Description

The technical solution relates to electrical engineering and can be used for anode grounding of cathodic corrosion protection installations of steel and reinforced concrete structures in contact with soil, river and sea water and other electrolytic environments, protective grounding of lightning protection devices, protection against high voltages and static electricity.

Products are used in cathodic protection systems:

- trunk, field and other pipelines and multi-pipe systems of pipelines in any soil, including rocky, arid, desert and permafrost, as well as in conditions of "stress corrosion";

- branched communications of compressor, gas distribution, oil pumping stations, thermal power plants and industrial sites for other purposes;

- technological tanks for any purpose, including internal surfaces;

- port and berthing facilities, offshore platforms and other hydraulic structures.

A known anode ground electrode containing a central electrode with metal elements fixed on it, surrounded by a cylinder of activator, based on a composition of conductive granular, porous granular material, in a shell made of thin-walled galvanized steel sheet (Patent RU 2196190 C1, C23F 13 / 16, published January 10, 2003).

The task to which the creation of this technical solution is directed is to increase the life of the anode ground electrode. The technical result achieved in this case is to expand the functionality of the anode earthing switch while reducing the speed and increasing the uniformity of dissolution of the electrode.

The technical result is achieved by an anode grounding conductor containing a central electrode with metal elements fixed on it, surrounded by a layer of activator in the form of a cylinder, the activator is made on the basis of a composition of conductive granular, porous granular material and is located in a shell made of galvanized steel sheet with a thickness of 0.1 -0.4 mm, characterized in that the central electrode is made of graphitoplast, and graphite chips are used as an activator. The technical result is achieved by the versions of the anode ground electrode, in which: the electrode is connected to the cable by means of a sealed connecting node; there are centralizers in the case; there is a mounting bracket on the case.

The drawing shows the claimed anode ground electrode in section.

The earthing switch consists of the following main components and parts:

1 - housing;

2 - carbon filler;

3 - electrode;

4 - sealed connecting node;

5 - sealed output;

6 - cable;

7 - top cover;

8 - bottom cover;

9 - centralizers;

10 - mounting bracket;

11 - clamp (finger).

The anode ground electrode contains a housing 1, which is a shell made of thin-walled (0.1-0.4 mm thick) galvanized steel sheet. The central electrode 3 is made of graphitoplast and is surrounded by a layer of activator 2 in the form of a cylinder, based on a composition of electrically conductive granular, porous granular material, which is used as graphite chips with a fraction size of 10-15 mm.

The main components of a complex anode ground electrode system are a central corrosion-resistant graphite-plastic electrode and a carbon filler. Due to its corrosion-resistant properties, the electrode has a low level of electrochemical dissolution.

The life of the anode ground electrode is determined by the dissolution rate of the carbon filler, that is, not less than the service life of the carbon filler. The rate of dissolution of the filler does not exceed 0.4-0.6 kg / A per year.

The main amount, up to 80%, of the carbon filler fraction should be 10-15 mm in size, which makes it impossible to erode it by circulating underground water.

Carbon filler gives a particularly tangible effect - the rate of dissolution of graphitaplast decreases several times. So, if without a carbon filler the mass loss is q = 0.8-1.2 kg / (A · year), then with backfill q = 0.2 kg / (A · year) or less.

Carbon filler paired with a graphite-plastic electrode shows another important property: it contributes to the removal of gaseous corrosion products. If they are not diverted in an organized manner, then sinuses and voids may occur, leading to uneven dissolution of the electrode, an increase in its resistance, and even termination of operation.

Claims (4)

1. Anode ground electrode containing a central electrode with metal elements fixed on it, surrounded by an activator layer in the form of a cylinder, the activator is made on the basis of a composition of conductive granular, porous granular material and is located in a shell made of galvanized steel sheet with a thickness of 0.1- 0.4 mm, characterized in that the central electrode is made of graphitoplast, and graphite chips are used as an activator. 2. The anode ground electrode according to claim 1, characterized in that the electrode is connected to the cable by means of a sealed connecting node. 3. The anode ground electrode according to claim 1, characterized in that the housing has centralizers. 4. The anode ground electrode according to claim 1, characterized in that the housing has a mounting bracket.