The module capacity meets the requirements and the three-phase configuration is balanced.
2. Lightning surge protector
Whether it is damaged or not connected (including lightning protection and grounding of surge protector, connection of three-phase power line, whether the connection position is normal, and whether the wire diameter meets the requirements), the lead wire of surge protector shall be insulated copper wire, and the withstand voltage shall not be lower than 16mm2.
When using modular SPD, the lead length should be less than1m. The grounding wire of the surge protector should be as short as possible, and the insulated multi-strand copper conductor of not less than 35mm2 should be connected to the grounding collector nearby, and the conductor should be yellow-green copper conductor. The length of SPD grounding wire should be less than1.5m.
3. Power cabinet
1) Power cabinet is grounded.
2) Cable grounding.
Iron sheet grounding introduced by armored cable: the steel belts at both ends of the cable should be grounded nearby;
Grounding of steel pipe introduced by casing steel pipe: both ends of steel pipe shall be welded with the grounding system of nearby base station;
3) Power cabinet fixing and door lock
The power cabinet is insulated and fixed with the ground;
The door lock is intact and closed.
4, transmission frame grounding
1) lightning protection and grounding;
2) introduction of optical cable;
3) Grounding of equipment and protection in the rack.
5. Lightning protection of main equipment
1) lightning protection device
2) Ground wire
6. Is there a lightning rod diameter around the base station?
Above or near the base station, because there are no overhead high-voltage lines and cables, it is not suitable to set up stations in high-power wireless transmitting stations, high-power radar stations, high-voltage power stations, welding equipment, X-ray equipment, heat engines that generate strong pulse interference, enterprises or medical units in high frequency furnace.
1) transformer-high and low voltage arrester
The terminals of the transformer shall be fastened without looseness, so as to ensure good electrical contact, no oxidation and heating, and no damage to the connecting porcelain insulator. There is no trace of oil spill in transformer shell. The grounding down lead of transformer neutral point and shell shall be well fastened without fracture and looseness.
2) Monitoring equipment
7, base station grounding
1) grounding grid requirements
Because there is no corrosion, corrosion, shedding, soil exposure, digging and other phenomena in the grounding network of the base station, the building (or tower) of the communication station should be equipped with lightning protection devices that can prevent direct lightning and inhibit the effect of secondary lightning strike.
The mobile communication base station shall, in accordance with the principle of equal voltage and equal potential, form a common grounding network with working grounding, protective grounding and lightning protection grounding. All kinds of grounding wires should be introduced from grounding hub or grounding grid respectively. All kinds of grounding wires should be short and straight to ensure the shortest drainage path.
2) Grounding resistance
Test whether the base station resistance meets the requirements. When the soil resistivity in the area where the mobile communication base station is located is lower than 700 ohm * m, the power frequency resistance of the base station grounding network should be controlled within 10 ohm. When the soil resistivity of the base station is higher than 700 ohm * m, the power frequency resistance of the base station grounding grid can be unlimited.