The grounding material is the main material of the grou […]
The grounding material is the main material of the grounding project. The selection of courtyard lamp is very important. The widely used grounding T-Pass materials include various metal materials (most commonly used such as flat steel), grounding body, resistance reducing agent and ion grounding system.
Metal materials, such as flat steel, are also commonly used to replace copper materials, which are mainly used in the construction of grounding rings, which are mostly used in grounding projects. The grounding body has metal grounding body (angle steel copper bar and copper plate), which has a short life, and the grounding resistance rises rapidly. The transformation of the grounding grid is frequent (some areas need to be modified every year). However, the special structure of the grounding body (with electrolyte material) derived from the traditional metal grounding electrode (body) has a better use effect, which is generally called the ion or hollow grounding system; In addition, the use of non-metallic grounding body is relatively convenient, with almost no life constraints, which is relatively recognized in all aspects.
The resistance reducing agent is divided into chemical resistance reducing agent and physical resistance reducing agent. The chemical resistance reducing agent has not been used since it was found that there is pollution accident of water source and the defect of corrosive grounding grid. Now it is widely accepted that the physical resistance reducing agent (also known as long-term resistance reducing agent) is a widely accepted material for grounding t process. It belongs to the uncertain composite material in materials science, which can be formed according to the use environment Therefore, different shapes of inclusions can be used in a wide range to reduce the contact resistance around the grounding ring and the grounding body at the same time as the grounding ring or the grounding body.
And the resistance reducing agent has diffusible components which can improve the conductivity of the surrounding soil. At present, the more advanced resistance reducing agents have a certain anti-corrosion ability, which can extend the service life of the grounding grid. Generally speaking, the anti-corrosion principles are as follows: sacrificial anode protection (electrochemical protection) tightly covers the metal to isolate the air, adding the external preservatives to improve the corrosion potential of the interface, etc.
Physical resistance reducing agent has been used for more than 30 years. After continuous practice and improvement, it is quite mature whether it is performance or using construction technology. The main function of the resistance reducing agent is to reduce the local soil resistivity in contact with the grounding grid. In other words, it is to reduce the contact courtyard lamp between the grounding grid and the soil rather than the grounding resistance of the grounding grid itself.