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29 technical requirements for ground photovoltaic power station projects
1. Photovoltaic modules are arranged horizontally.
2. The photovoltaic panel steel bracket uses front and rear legs, and the columns do not use C-shaped steel.
3. The optimal method for the photovoltaic panel support foundation should be determined based on the geological survey report, and the pile spacing should be 1.2m~1.5m.
4. The DC conductors should be made of photovoltaic-specific DC conductors to minimize losses, and the upper and lower wiring should be separated in rows.
5. Optimize the wiring of the combiner box and minimize cable channels.
6. The DC switch in the combiner box needs to add a signal module and a surge protector.
7. The group capacity ratio is comprehensively determined based on local irradiation resources and power restrictions, and in principle is not less than 1.1:1
8. The box transformer foundation is 500mm higher than the floor.
9. The connection cable from the box transformer to the inverter adopts a three-core cable.
10. Each 35kV collector line shall not exceed a maximum of 10MW.
11. In-field communication uses ring network communication.
12. Cable joints are cold-shrunk.
13. The wiring terminals in the combiner box must be equipped with copper wiring bars to meet on-site wiring requirements.
14. Anti-reverse diodes are installed in the combiner box and not on the inverter side.
15. SVG adopts step-down type, and the capacity is considered to be 12Mvar.
16. The 35kV intelligent measurement and control device and live display device must be installed on the switch cabinet door.
17. A cable tunnel is used to arrange cables at the bottom of the 35kV power distribution device, and a manhole is set up in the 35kV power distribution room to enter the cable tunnel.
18. Resistor grounding is used in the booster station that requires secondary boosting. The grounding method of the switch station needs to meet the requirements of the power grid and can use arc suppression coil or resistor grounding.
19. The photovoltaic module arrays are bridged with grounded flat steel and grounded down, and both ends must be reliably grounded.
20. The bottom edge of conventional ground power station components should be no less than 500mm away from the ground where weeds grow, and no less than 400mm away from the rest.
twenty one. In areas with serious pollution such as coastal areas, photovoltaic modules adopt anti-PID modules, inverters adopt anti-PID configurations, and all electrical equipment adopts pollution-resistant equipment.
twenty two. The steel bracket needs to meet the structural requirements and increase the wall thickness and galvanizing thickness to resist corrosion. Fiberglass brackets can also be used.
twenty three. The power distribution building is equipped with a 35kV power distribution room, a low-voltage station power distribution room, a centralized control room (an area of not less than 40m2, using a 300mm elevated floor), a secondary equipment room (using a 300mm elevated floor), a tool room, and a rest room.
twenty four. The capacity of the comprehensive building is considered to be 12 people (1 general manager, 1 deputy general manager, 10 operating personnel), and it is necessary to set up 1 general manager office, 1 deputy general manager office, 1 large public office, and 1 large conference room, 1 activity room (about 50m2), 1 data room, 1 spare room, 1 kitchen, 1 small restaurant, 5 double dormitories (including independent bathroom), 1 general manager dormitory (including independent bathroom) , 1 deputy general manager dormitory (including independent bathroom), 1 independent bathroom.
25. The booster station and complex building areas adopt cement roads, the main road is 6m wide, and parking lots are set up. The field area adopts gravel roads.
26. The fence of the photovoltaic field area adopts a wire fence (the total height is not less than 1.8m, and the bottom is not more than 150mm from the ground). The booster station and the comprehensive building area adopt a 500mm high solid wall at the bottom, iron art at the top, and a total height of not less than 2.2 m's fence.
27. HVAC heating uses electric radiant equipment.
28. A floodlight is installed at the corner of each inverter, and the light direction is directed to the corresponding box-type transformer area.
29. The inverter should be arranged in the center area of the square array, with roads next to it.
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