ROTOR FOR A WIND TURBINE AND WIND TURBINE

A rotor (2) for a wind turbine (1), comprising: a blade (3), a hub (4), a pitch bearing (5) being configured to support the blade (3) rotatably about a longitudinal axis (L) of the blade (3) and relative to the hub (4), and one or more metal arcs (13) for conducting a lightning current (I) from the blade (3) to the hub (4), wherein each of the one or more metal arcs (13) comprises: a first arc portion (14, 14', 14") electrically and mechanically connected to the blade (3), a second arc portion (15, 15', 15") electrically and mechanically connected to the hub (4), and a bent portion (16, 16', 16") connecting the first and second arc portions (14, 14', 14", 15, 15', 15"), and wherein each of the one or more metal arcs (13) is configured such that, when the blade (3) rotates relative to the hub (4), the first arc portion (14, 14', 14") is shifted relative to the second arc portion (15, 15', 15") and a length (L1, L1', L1") of the first arc portion (14, 14', 14") is reduced or increased at the expense of an increase or decrease of a length (L2, L2', L2") of the second arc portion (15, 15', 15").Having the one or more metal arcs each connected electrically and mechanically at the first arc portion thereof to the blade and the second arc portion thereof to the hub allows to conduct a lightning current from the blade to the hub bypassing the pitch bearing. Thus, damaging of the pitch bearing by a lightning current is avoided.