Partial discharges on offshore wind turbines may happen due to poor installation of the subsea cables. In order to detect partial discharges in cables and remote plants an inductive High Frequency Current Transformer (HFCT) is used. The local partial discharge activity is detected by Capacitive Transient Earth Voltage (TEV) sensors. When those two sensors are combined, they can provide a system that is sensitive to different types of partial discharges in cables.Such systems measure high level of partial discharges and trigger a signal that includes the time and the location of the partial discharge on the cable. The partial discharge usually occurs on the weak points of the land-sea export cable, the land cable joint, the land subsea cable joint, on the subsea terminators or at the land terminators. By replacing the problematic joint the high partial discharge activity will stop or at least significantly diminished