Lightning protection grounding
resistance reducing material
Address: Wuluohou Industrial Zone, Weicun Town, Qingyuan District, Baoding City, Hebei Province
Nano-carbon composite anti-corrosion grounding flat steel (pole) has excellent electrical conductivity and anti-corrosion. It is the second-generation product launched on the basis of the anti-corrosion application of power grounding grids. Nano-carbon and organic polymer infiltrate each other with a particle size of almost the same order of magnitude, and there is no obvious interface. Therefore, nano-carbon can improve the conductivity of the coating. Nano-carbon also has a sealing function. After the material is cured, the electrolyte solute cannot penetrate into the coating, so the anti-corrosion performance of the nano-carbon material is better than that of general coatings. The expected service life of the nano-carbon spun-corrosion conductive coating is more than 30 years. Nano-carbon and polymer infiltrate each other with a particle size of almost the same order of magnitude, and there is no obvious interface between the two. Therefore, nano-carbon can improve the conductivity and sealing performance of the coating. After the coating is cured, the electrolyte solution cannot penetrate into the interior of the coating, so the anti-corrosion performance of the nano-carbon coating is better than that of the general coating. In an AC transmission system where the neutral point is directly grounded, a short-circuit current of tens of kiloamperes will enter the ground through the ground grid (duration time is about 0.1S) in the event of a fault. Due to the excellent high temperature resistance of the nano-carbon material, the nano-carbon anticorrosive conductive coating successfully passed the thermal stability test. Once the ground grid is impacted by a large current caused by lightning or a short-circuit accident, the nano-carbon anticorrosive conductive coating will not be burned.
The working grounding grid (grounding device) of the AC system is an important device for the safe operation of petrochemical power production. In recent years, with the increase of power capacity and voltage levels in my country’s petrochemical and power industries, major power operation accidents have been caused by the corrosion of the domestic ground grid. Excavation inspections in various provinces have shown that the general regional ground grid will corrode within 15 years. In saline-alkali areas or ground grids using "resistance reducers", the corrosion is more serious. Calculated based on 15 years of corrosion, the ground grid can no longer meet the requirements for thermal stability, and cannot withstand the large currents caused by lightning shocks or short-circuit accidents. Once the ground grid is burned, the ground potential rises sharply, and the high voltage rushes to the secondary circuit, causing a large number of power transmission and transformation equipment to burn.
1. Excellent conductivity
When designing a ground net made of any material, the cross-section of the ground net is generally considered. That is, the ability to conduct large currents, and conductivity is relatively easy to meet. Nano-carbon anti-corrosion conductive coating is a new generation of anti-corrosion conductive material developed on the basis of the operating experience of nickel powder and graphite powder anti-corrosion conductive coating. As a conductive additive, nano-carbon gives the coating better conductivity than graphite powder and nickel powder.
2. Excellent corrosion resistance
To ensure the long-term safe operation of the ground grid, the anti-corrosion of the ground grid is fundamental and also a major technical problem. Therefore, for the grounding device, the emphasis is on the anti-corrosion. Because the nano-conductive material film-forming material has almost the same order of magnitude. The particle diameters of nanometer carbon penetrate each other without obvious interface, and the electrolyte solution cannot penetrate into the interior of the coating. Therefore, the corrosion resistance of the nano-carbon anticorrosive conductive material is obviously better and better. The expected service life is more than 30 years. Combined with the use of different steel conductor materials, the expected service life of the grounding device can reach more than 40 years.
3. Reliable thermal stability
Among the anticorrosive coatings for ground grids, nano-carbon anticorrosive conductive coatings are currently qualified products in my country that have passed the thermal stability test (that is, the high current impact test). The flat steel coated with nano-carbon anticorrosive conductive coating has no discoloration in the middle and no coating peeling off; both ends of the flat steel without nano-carbon anticorrosive conductive coating are burned and discolored by high current.