A new dynamic detection method for roll bearing faults was proposed based on wavelet packet and cross entropy from the angles of information differences of detection signals.
A fault is not a simple plane, but a belt composed by a series of breaking planes or secondary faults, which is contradict with the hypothesis of the theory of cross-fault lithology juxtaposition.
Although fault component current phase selector has excellent performance for single transmission lines, it may select unwanted phase for cross-country faults in double-circuit lines on a same tower.