| 摘要 |
Substations (1, 2) supply rectified DC power containing an AC ripple to third rails (3A, 3B) of a railway system via ground fault disconnect switches (51, 52). A current transformer (7) connected in the power supply circuit of a railway vehicle (100) senses AC components, and its output is fed to a frequency detector (8) which determines if the substation ripple is present. If not, the detector actuates the motor controller (11) of the vehicle to disable regenerative braking and thereby to prevent exacerbation of the fault. |
