Research on electromagnetic transient process in articulated split‐phase insulator of high‐speed railway considering viaduct's electrical coupling

Summary In single-phase alternating current (AC) traction power supply system, to balance 3-phase load of power system, each phase of electricity is used in rotation. Based on the 7-section articulated split-phase insulator of China Beijing-Tianjin high-speed railway line, different electromagnetic transient processes are deeply analyzed considering pantograph arc and viaduct's electrical coupling in this paper. First, based on the lumped parameter model, the process of high-speed train passing the articulated split-phase region, concluding the upper viaduct part and the lower viaduct part, is deeply studied. Second, through state-space technique, 4 independent electromagnetic transient processes in articulated split-phase region of high-speed railway are derived and analyzed thoroughly considering the impact of pantograph arc and viaduct. Finally, the integral transient process is accurately simulated and analyzed by ATP-EMTP software under several circumstances, such as different topologies, initial phase and phase difference of feeders, and specific suppression overvoltage measures. The independent and integral comparison results illustrate that the coupled viaduct can lead to the more complex topologies and electromagnetic transient processes. Also, the coupled viaduct can play a significant topology discharge and pantograph overvoltage suppression role for the high-speed train passing articulated split-phase region.

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