Lightning protection of telecommunication tower stations
Lightning towers protect buildings from lightning strikes within a radius around the building, and transmit power to any energy battery connected to the building.
Lightning protection provided by lightning arresters to telecommunications stations (strikes with indirect effects) applies to all power grids. Protection must also be provided in case
By placing a lightning arrester (near the top of the tower) to directly strike the lightning, the grounding device of the arrester has the same potential as the grounding of the power grid, which can provide good protection. Lightning current path throughout the installation.
Measures to prevent indirect lightning strikes to the grid must be comprehensively addressed.
They must be used with grounding (low impedance) optimized grounding networks in accordance with standard practice. The effectiveness of protection depends on the quality of the ground used with the protection equipment.
Protection against direct strike and grounding connector Protection against direct strike on structures such as telecommunication relay towers and other towers requires installation
Lightning arrester or simple tip (near the top) and install a valid ground connector (ground).
The resistance of the lightning ground connector must be less than 10 ohms. This resistance will be checked during installation and during and after maintenance operations (contracts) using appropriate inspection equipment. All verification steps are described in NF Standard C 17-102 for arresters with spark plug devices, and for simple tips, NF Standard C 17-100 is described.
Calculation of the protection zone II (D = 45m) III (D = 60m) The protection radius Rp of the OPR is given by the French standard NF C 17-102 of July 1995. It depends on the measured TPR of the start of the OPR in the high-voltage laboratory, calculated according to the lightning risk assessment guidelines (French standard NF C 17-102, Appendix B). The height h of the area is protected (minimum height = 2m).
The degree of protection is calculated in accordance with Annex B of the French standard NF C 17-102. For OPR 60, experiments performed by members of the Gimelec (Electrical Equipment Materials and Related Industrial Electronic Materials Industry Group) members have limited the T value used for protection radius calculations to 60 µs.
