Down conductor connection system, wind turbine lightning protection system, and method for arranging a down conductor connection system

A down conductor connection system for a lightning protection system adapted to protect a wind turbine blade from lightning strikes, said lightning protection system having a down conductor cable adapted to extend in a longitudinal direction of said wind turbine blade and being connected to the root end of said wind turbine blade, and a number of lightning receptors electrically connected to and distributed along the length of said down conductor cable,

• said down conductor connection system having a modular down conductor cable having a first and second down conductor cable part, and at least one down conductor connector arranged between and connected to ends of said first and second down conductor cable parts,
• said down conductor connector having a first terminal connected to an end of a first down connector cable part, and a second terminal connected to an end of a second down conductor cable part,
• said first and second terminals being adapted for mutual connection, such that when being connected, said first and second down conductor cable parts at least partly define said modular down conductor cable.