(1) Environmental characteristics of desert photovoltaic power stations
1. Year-round windy sand and strong corrosiveness; 2. High temperature and drought; 3. Large temperature difference between day and night; 4. High soil resistivity; 5. Large desert area.
(2) Selection of grounding materials for desert photovoltaic power stations
1. Deserts are prone to corrosion and soil resistivity is high. In order to extend the life of the project and reduce operation and maintenance costs, pure copper grounding rods should be used as vertical grounding bodies.
Zinc-clad steel ground rod
2. The desert area is large, the soil resistivity is high, the construction is convenient, and it is corrosion-resistant. The horizontal grounding body should be used
Copper stranded wire, zinc-clad steel round wire. However, because the desert area is large, the grounding resistance drops quickly, and the cost is high, it is not suitable to use copper busbars for horizontal lines.
3. Connection method: physical connection (cable clamp connection) and chemical connection (exothermic welding).
Pure copper ground rod: diameter 16mm~25mm, etc., length 1.2~3 meters, etc.
Copper stranded wire: 50mm2, 70mm2, 95mm2, 120mm2, 150mm2, etc.
Zinc-clad steel ground rod: diameter 16~24mm, etc., length 2~3 meters, etc., zinc layer 1~3mm
Zinc-clad steel round wire: diameter 12~18mm, etc., length 6m/wire, zinc layer 1~3mm
Exothermic welding: molds, flux, welding tool kit
Cable connection: one-line clip, cross clip, etc.