I. Introduction
ion grounding system of advanced ground electrode by a sustained release (sustained release reversible containing fillers), initiator and filler electrolytic ion synergistic composition. The surface of the electrode is made of red copper alloy to ensure the highest conductivity and long service life, and it is equipped with two types of fillers inside and outside. The filler is a non-toxic compound and does not pollute the environment. Experiments have proved that the direct cause of the excessively high soil resistivity is the lack of auxiliary conductivity of free ions. The filler on the outside of the grounding conductor is mainly made of materials with strong water absorption, strong adsorption and high cation exchange performance. It is equipped with long-lasting, resistance-reducing, strong anti-corrosion functions, high expansion coefficient, and is not affected by temperature changes, and is resistant to high voltage. A variety of impact chemical materials are auxiliary materials. It is mainly used to solve the problems of humidity, ion generation content, and anti-corrosion protection around the grounding conductor, so that the conductor and the ground are tightly combined, thereby reducing the contact resistance between the electrode and the soil, improving the resistivity of the surrounding soil, and effectively enhancing the lightning conductivity Pass release ability. The inner filling material of the conductor contains a special electric ionic compound, which can fully absorb the moisture in the air. Through deliquescence, active electric ions are effectively released into the soil, and interact with the moisture in the soil and the air to further promote the slow release and resistance reduction of the external conductor, and keep the resistance value stable for a long time. The compound inside the conductor gradually turns into a colloidal transparent state over time. We use the conductive properties of colloidal compounds to enable the entire system to be in a state of ion exchange for a long time, thus forming an ideal electrolytic ion grounding system. The construction of the project is simple. When the outdoor construction conditions are not available, it can also be installed and used indoors at the bottom of the building. The single-pole covers an area of ​​only 0.1 square meters. The tolerance for construction conditions is especially suitable for use in densely-built cities. . The additional cost of the project is small and the service life is long. After the slow-release filler in the conductor is buried, the grounding resistance will gradually decrease and reach a stable value within half a year to a year. The slow-release process can be as long as 30 years. The product fully complies with the requirements of UL, NEC, ANS, IEC, BS and other international standards for the protection of grounding equipment.
Second, the principle
grounding resistance grounding device typically consists of three parts.
The first part: the resistance of the grounding body itself, usually the grounding electrode is made of metal, this part of the resistance only accounts for 1% to 2% of the grounding resistance, which can be ignored;
The second part: the grounding resistance of the contact part of the grounding electrode and the soil, in general soil, this part accounts for 20~60% of the grounding resistance; the
third part: the resistance when the current flows through the grounding electrode and flows into the soil, this part is scattered The flow resistance is determined by the soil resistivity.
1 release (ion) grounding works
content in soil is one active ion for grounding resistance factors, many of the compounds in soil containing active ion electrolyte more scarce, simple grounding requirements will not reach the ground. After experimental comparison, a reversible slow-release filler was added to the ground electrode. This filler has the characteristics of water absorption, water release and reversibility. This reversible reaction effectively ensures the effective temperature of the environment inside the shell and ensures the stability of the grounding resistance. The filler has no toxic and side effects, and has achieved good effects in both ion generation and corrosion prevention of copper alloys during long-term coordination with metal electrodes. After the ions generated in this way absorb the earth’s moisture, they can effectively release the active electrolytic ions into the surrounding soil through deliquescence, so that the grounding electrode becomes an ion generating device, thereby improving the surrounding soil quality to meet the grounding requirements.
2 initiator synergistic filler works electrolytic ion
chemical process for the shell layer of soil and through the synergistic interaction of electrolytic ion initiator filler, lowering the resistivity of the soil shell. At the same time, a transition zone is formed between the slow-release grounding electrode and the earth soil. The selection of chemical substances and the composition standard of the chemical composition are:
(1) As a carrier connecting the grounding electrode and the earth, it has good expansibility and affinity Strong characteristics, increase the equivalent cross-sectional area of ​​the ground electrode and the contact area of ​​the soil;
(2) Good adsorption performance, eliminate the contact resistance between the ground electrode and the soil, and improve the electric field distribution in the ground;
(3) Good permeability, deep into the soil and rock cracks, forming a tree root network, increasing the drainage area in the ground;
(4) Absorb water, maintain the internal balance of water in the shell, and not lose;
(5) Through pulse After the current is applied, ionization does not occur;
(6) Protect the ground electrode from various corrosion and aggressions in the soil, and has an anti-corrosion effect on the electrode;
(7) The unique negative resistance characteristic reduces the potential distribution gradient between the ground surface devices when the grounding body discharges instantaneously, and improves the safety protection and reliability of people, equipment and facilities;
(8) Non-toxic ,side effect.
Through the joint action of the slow-release grounding electrode and the synergistic electrolytic ion filler, a shell internal environment is formed. The internal and external fusion of this internal environment gradually diffuses to the surroundings, and jointly completes the chemical treatment of the shell soil. So as to effectively solve many problems in grounding technology, it becomes a good technical alternative.
Third, the installation method of
a borehole
in the construction site selected ф155mmX3155mm drilled holes perpendicular to the ground.
2 formulated filler
placed within the container is greater than the volume of 150L 50KG freshwater, the initiator is added, stirring until completely dissolved, was added efficiency ion fillers, stirred to a paste.
3 implant grounding
open ends grounding sealing tape, the 1: 4 preparation of a good filler is filled into the bottom of the hole, the ground electrode implanted in the cavity in the top ground plane parallel with the ground electrode; a ground lead line, the remaining Fill the filler around the grounding electrode to 100mm from the top of the grounding electrode. Put on the protective cap, measure the grounding resistance, and fill the area around the protective cap with soil. The top of the cap is 100mm above the ground.
horizontal installation vertical installation
bore not more than 155mm, in order to avoid underfilling filler; note bar on the vent hole when the lid of the protective cap can not be blocked by dirt or fillers, the cap back on the vent hole fill, not Blocked. When a set of grounding electrodes fails to meet the ground resistance requirements, two or several sets can be used in parallel, and the distance between the rods should not be less than 5m. The lead wire should be 95mm2 multi-strand copper wire, and the lead wire and the ground electrode should be connected by exothermic welding.
Connect the installed ion ground rod electrodes with bare copper cables to form the main ring, and the connection points are welded with exothermic heat. Repeat steps 1 to 5 for the installation of other WT-IGA electrodes. After WT-IGA is installed according to the above steps, it can be put into use.
Note: The down conductor of the lightning rod must be directly connected to the grounding main ring of the WT-IGA grounding system, and the grounding wires of other equipment must be connected to the grounding main busbar.