Lightning protection system for a wind turbine and wind turbine comprising such a lightning protection system

A lightning protection system for a wind turbine, comprising a connection unit to be placed between a nacelle and at least one blade of the wind turbine for conducting lightning current and/or static energy from the at least one blade to the nacelle, the connection unit comprising a first end portion with at least one nacelle contacting element, a second end portion with at least one blade contacting element, at least one first support member supporting the at least one nacelle contacting element, at least one second support member supporting the at least one blade contacting element, a base portion located between the first support member and the second support member, and at least one shifting element mechanically connecting the first support member and/or the second support member slidably relative to the base portion for amending a length of the connection unit in an amending direction from the at least one blade to the nacelle, wherein the base portion comprises an electroconductive material and conducts the lightning current and/or static energy from the second end portion to the first end portion,

• wherein at least one end portion of the at least one shifting element is fixed at the base portion, at least one other end portion of the at least one shifting element is fixed to the first support member and/or to the second support member, the base portion comprises at least one guiding projection, and the first support member and/or the second support member each comprise a guiding slot, in which the at least one guiding projection is slidably located.