The location of the base station is often poor in soil quality, mostly gravel soil, weathered rock or granite stone, especially the base station located in the mountainous area. The topsoil is only ten to several tens of centimeters thick, and the soil resistivity of the earth is high. It is extremely difficult to make the grounding resistance small and meet the requirements. Therefore, rational design of grounding systems for various mobile communication base stations is an important issue in current grounding projects. Microwave stations and mobile communication base stations are similar.
1. The area where mobile base stations and microwave stations can be directly constructed is not large, and often irregular. Many construction sites are on the top of the mountain and halfway up the mountain. The construction is often not a plane and the span is large.
2. Mobile base stations and microwave stations are often built in higher positions, such as mountain tops and roofs, especially mobile base stations and microwave stations located in mountainous areas. The soil resistivity is high and it is difficult to reduce the resistance. Therefore, it is necessary to use better resistance-reducing materials. For example, Balic electrolyte ion grounding electrode and bentonite type physical resistance reducing agent.
3. The grounding net located in the mountainous area, because it is buried in the rock (small soil), so the rain erosion, the erosion is more serious than the plain area, will accelerate the laying of materials, so long-life grounding materials and connection technology should be used, Do not apply temporary resistance reduction measures such as salt water.
4. Difficulties in transportation, difficult construction of grounding grid, difficult maintenance and high labor cost. Therefore, the grounding material of the base station should consider the service life. Although the raw material cost is low, the service life of the conventional steel material is short, and the company recommends using copper-clad steel or pure copper grounding product.
Note: This article only discusses the grounding problem of mobile base stations and microwave stations, and does not cover the scope of one lightning protection (direct lightning strike) and secondary lightning protection (inductive lightning).