PROBLEM TO BE SOLVED: To provide a damage detecting method and a damage detecting system of a wind turbine blade, capable of highly accurately detecting damage of a conductive composite material, even if at least a part of the wind turbine blade is constituted of the conductive composite material and a composite material protective conductor for covering the conductive composite material and the conductive composite material are equipotential.;SOLUTION: A wind turbine blade 1 includes conductive composite materials 12, and composite material protective conductors 16 for covering the conductive composite materials 12 and equipotential with the conductive composite materials 12. The damage detecting system 20 acquires lightning current parameters on a lightning current flowing in the conductive composite material 12 of the wind turbine blade 1 when the wind turbine blade 1 is struck by lightning, and detects the damage of the conductive composite material 12 of the wind turbine blade 1 based on the lightning current parameters.;COPYRIGHT: (C)2013,JPO&INPIT
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