An arrangement 200 and method for detecting a lightning event 202 in an optical ground wire (OPGW) 201 of an electric overhead power line system, the arrangement comprising: an optical ground wire 201 comprising an optical fibre cable surrounded by a conducting material; an electromagnetic radiation source (315, Fig. 3) for generating primary radiation (317, Fig. 3), to be coupled into the optical fibre cable; a radiation detector (319, Fig. 3) for detecting secondary radiation 221 originating from interaction of the primary radiation (317, Fig. 3) with the optical fibre cable influenced by acoustic disturbance and/or vibration of the optical ground wire; an analysis unit (323, Fig. 3) configured to analyse the detected secondary radiation, to generate analysis information, in order to identify at least one lightning event, in particular lightning stroke, at the optical ground wire.
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