Patent ID: 8888454

Claim:
A wind turbine blade with a lightning protection system ( 1 , 51 , 101 , 201 ), wherein the blade ( 1 , 51 , 101 , 201 ) comprises a shell body made of a composite material and comprises a longitudinal direction with a root end and a tip end, the blade further comprising a profiled contour including a pressure side and a suction side, as well as a leading edge and a trailing edge with a chord having a chord length extending there between, the profiled contour, when being impacted by an incident airflow, generating a lift, and wherein the lightning protection system comprises: at least one lightning receptor ( 3 , 53 , 103 , 203 ) arranged freely accessible in or on a surface of the shell body surface, and a lightning down conductor ( 2 , 52 , 102 , 202 ) made of or comprising an electrically conductive material and extending within the shell body from the lightning receptor ( 3 , 53 , 103 , 203 ) to the root end of the blade ( 1 , 51 , 101 , 201 ), and wherein the lightning receptor ( 3 , 53 , 103 , 203 ) and the lightning down conductor ( 2 , 52 , 102 , 202 ) are electrically connected, characterized in that the shell body comprises at least a first conductive layer ( 60 , 62 ) extending along at least a longitudinal part of the lightning down conductor ( 2 , 52 , 102 , 202 ) in a transverse distance therefrom, wherein the first conductive layer ( 60 , 62 ) is electrically isolated from the lightning down conductor ( 2 , 52 , 102 , 202 ) and from the lightning receptor ( 3 , 53 , 103 , 203 ), and wherein the first conductive layer ( 60 , 62 ) has a sheet resistance in the range of 1 to 5 Mega Ohm per square.