What is a radio base station (RBS) earthing network?
The most important objective of the radio base station (RBS) earthing network is to minimize the differences in potential between the conductive parts within the RBS site (equipotential bonding), which is beneficial for the safety, lightning protection and electromagnetic compatibility (EMC) performance of the equipment.
How should a lightning protection System (RBS) be formed?
The earthing network of an RBS should be formed by a ring loop surrounding the tower, equipment room and fence, at a minimum. The mean radius re of this ring loop should be not less than l1, as indicated in Figure 1 and this value depends on the lightning protection system (LPS) class and on the soil resistivity.
How do you measure earthing resistance in a wireless base station?
In the earthing system for a single wireless base station, the earthing network, down-conductors and metal conductors make a test loop. By using a clamp meter, the earthing resistance of the entire loop can be measured, but not the earthing resistance of the earthing network.
How to protect the navigation light system in the equipment room?
Figure 12 shows protection of the navigation light system in the equipment room. If the NL has internal control circuits or it is based on LED technology, then an SPD is required on the top of the tower to protect the lamp. This SPD can be integrated into the lamp box.
What is an indoor earthing bar & a power distribution box (PDB)?
The indoor earthing bar and the power distribution box (PDB) are installed close to the feeder panel. The PDB has SPDs connected between the power conductors and the earthing bar. The indoor earthing bar is provided for the bonding connection of the PDB and all the equipment inside the equipment room.
What is the minimum earthing resistance for RBS?
Therefore, whenever it is feasible, the RBS earthing resistance should be as low as 10 Ω. Alternatively, instead of achieving a low earthing resistance value, a minimum earthing network mean radius should be achieved. The earthing network of an RBS should be formed by a ring loop surrounding the tower, equipment room and fence, at a minimum.
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