Today, I'd like to introduce to you some ccs materials
, which are no longer unfamiliar to you. At least, we can say the names of the materials and get a preliminary understanding of their performance.
First of all, the most common and basic ones are angle steel and flat steel. This is necessary for every basic ground network. Generally, the angle steel is 2.5 meters long. In places where the soil is not very good, the angle steel can be cut down appropriately. The angle steel can be drilled underground and welded with the flat steel. The transverse distance between the two angle steels is about twice the length of the angle steel. The length of flat steel is determined according to the size and circumference of the ground network, generally 40 meters, 60 meters, 80 meters or even larger.
Secondly, resistance reducer and grounding module. In many places where the soil resistance is high, it is necessary to use resistance reducing agent and grounding module appropriately. Resistance reducing agent is suitable for grounding engineering in various areas such as high soil resistivity, high mountain water shortage and high corrosiveness. For example, safe grounding, working grounding, protective grounding, lightning protection grounding and static grounding for power transmission and transformation, television, petrochemical plants, laboratories and high-rise buildings. This kind of grounding body is mainly made of non-metallic materials. It is composed of non-metallic minerals and electrolytes with good conductivity and invariance. It enlarges the scattering area of the grounding body and reduces the contact resistance between the grounding body and the soil. The soil resistivity decreases, dielectric constant increases, contact resistance between layer decreases, and corrosion resistance strengthens due to the existence of strong moisture absorption and moisture retention ability, so that smaller grounding resistance and longer operation life can be obtained. Generally used quantity is 2 packs of drag reducing agent per angle steel, then 2,3 packs of flat steel are added beside it.
Third, the copper clad steel grounding rod. Generally, the place with high soil resistivity is used instead of angle steel, which combines the advantages of copper and steel. It not only has good electrical conductivity and corrosion resistance of copper, but also has high mechanical tensile strength of steel. The copper clad steel grounding rod (with threads) is a kind of high quality low carbon steel with good softness and carbon content of 0.10%-0.30%. The high conductive electrolytic copper is evenly covered on the surface of round steel by special technology, and its thickness is 0.25-0.5mm. The process can effectively slow down the oxidation speed of grounding rod in underground. Thread is processed by roller thread groove, which keeps the close connection between steel and copper, ensures high strength and has excellent electrical grounding performance.
Fourth, copper bars are also suitable for places with high soil resistivity. If the angle steel flat steel, resistance reducing agent and grounding module can not be solved, they can be used instead of flat steel, and the effect is better. In the area of high soil resistivity, the grounding resistance of the grounding grid can be effectively reduced. After repeated high current shocks, the resistance value does not increase, and there are no hardening, brittleness, fracture and other phenomena.
Fifth, the ion grounding rod has very good resistance reduction effect and long service life. Generally, it can be used for thousands of soil resistivity, but the cost is too high to be used in general places. The product needs a drilling rig to drill a hole with a diameter of 30 cm. Depending on the type used, the depth of the product varies from 1.5 to 3.5 meters. It can be mixed with drag reducer, and the effect is better.