Abstract: A monitoring system for a wind turbine blade, wherein the wind turbine blade includes an electrically conducting or semi-conducting structural component and a lightning protection system having a down conductor electrically connected to an lightning receptor, wherein the down conductor is electrically connected to the structural component by an equipotential connector, such that, a network of electrical impedances including the structural component, the equipotential connector and the down conductor is formed, whereby the hybrid monitoring system includes, a sensing device for the network, including a transmitter for emitting an electrical pulse into the network via a first terminal and a receiver for receiving a reception pattern of the electrical pulse from the network via a second terminal, and an evaluation device for evaluating the reception pattern to determine a first health information regarding the lightning protection system, and a second health information regarding the structural component, is pro