Lightning frequently strikes wind turbine blades, especially their tips. The combined mechanical and thermal energy can cause localized carbonization, trailing-edge cracks or puncture, stopping turbines, reducing generation and increasing maintenance costs. Engineers need strike time, blade location and current amplitude to assess damage risk. A sensor coil mounted on the blade grounding conductor converts induced current into a constant optical signal, transmitted by fiber to the main monitoring unit. Results are then sent to the server for recording and alarms.

The blade lightning current monitoring system uses the IMon-L100 acquisition unit and the coil in the ISen-L701 sensor to monitor current in the blade grounding conductor. Induced current is converted into a constant optical signal and transmitted by fiber to the main monitoring unit. Photoelectric conversion turns it back into an electrical signal, which passes through conversion circuits to the CPU. The CPU reconstructs strike information, stores it internally and makes it available through RS485.