| 摘要 |
A device for detecting an islanding condition in an electricity distribution network, comprising means for receiving (442) a signal of the electricity distribution network, means for determining (412) an islanding condition based on the received signal. The device comprises means for determining (402, 404, 406) a voltage total harmonic distortion change parameter for each phase component in the received signal, means for determining (408) a voltage unbalance change parameter in the received signal, means for comparing (412) each of the voltage total harmonic distortion change parameters and the voltage unbalance change parameter to respective triggering conditions, means for concluding (412) an islanding condition to have been detected if the voltage total harmonic distortion change parameter for each phase component of the signal and the voltage unbalance change parameter fulfil their respective triggering conditions. |
