24-hour traction current based modular pillow stack on Wuhan Metro Line 6 are reported.The fluctuation features, which corresponding to the interval of vehicle operation, indicate that there are four types of inrush current periodically appearing throughout the all-day waveforms.The first type consists of two positive sharp waves.
The second type is saddle shaped, and consists of two positive peaks and an anti-peak.The third type consists of two double peaks followed by a sharp peak about 1 minute later.The fourth type consists of two hump shaped waveforms.
The whole operation time can be divided into the peak and off-peak hours according to these repetitive segments.The interval of any two adjacent vehicles is 9 minutes and 11 minutes, respectively, in peak and off-peak hours.The distribution and the positive average value of feeder current per hour from 6:00-24:00 are counted and analyzed.
Results show that the current distribution in off-peak hours is more concentrated in a narrower range than that in peak hours.The differences in averages between various 15-minute periods in an hour can be as high as tens of amperes, due to the occurrence time of repetitive segments.The rail potential has relatively consistent mcdsp apb 8 variation with feeder currents, but it matched best with the sum of up-line and down-line in a same section instead of one of the two lines.