5KOHLER J L, LIM J. DC trolley fires-a new solution to an old problem [J]. IEEE Transactions on Industry Applications,1995,31(4):726-732.
6LI J. Frequency analysis of high- impedance arcing fault currents on DC trolley systems [D]. Pennsylvania, USA: The Pennsylvania State University, 1996.
7LI Jincheng, KOHLER J L. New insight into the detection of high-impedance arcing faults on DC trolley systems [J]. IEEE Transactions on Industry Applications, 1999,35(5) : 1169 - 1173.