| 摘要 |
The invention relates to a method for checking a rotational speed relay (17) of a wind turbine (10). The wind turbine (10) comprises a rotational speed sensor (20, 21, 22) for the rotational speed of a shaft (15, 16). The rotational speed sensor (20, 21, 22) outputs a rotational speed signal, which is fed to a signal input (25, 26, 27) of the rotational speed relay (17). The rotational speed relay (17) generates a switch-off command if the rotational speed of the shaft (15, 16) exceeds a specified rotational speed limit (nlimit). In the method, the rotational speed signal fed to the rotational speed relay (17) is first inactivated. Then a signal generator (28) is activated, which produces a check signal equivalent to the rotational speed signal. The check signal is fed to the signal input (25, 26, 27) of the rotational speed relay (17). The signal generator (28) is operated with a check signal that is beyond the rotational speed limit (nlimit), and a check is performed to determine if the rotational speed relay (17) generates a switch-off command. The invention further relates to a wind turbine (10) for carrying out the method. By means of the method according to the invention, the functional capability of the rotational speed relay can be checked reliably and at low cost. |
