Abstract
The safe and reliable operation of the DC traction system is the basis for the safe operation of modern urban rail transit, and the calculation of the short-circuit current plays an important role in the design of the DC traction power supply system. In the paper, the structure and function of the subway traction power supply system are introduced, and a simulation model of external AC power supply, rectifier unit and traction network are established. Then, based on the structure and parameters of actual subway traction power supply system, a simulation model of the power supply system is established. Under the short-circuit condition in power outlet, short distance and long distance, the short-circuit characteristics in these three situations are obtained. It provides a reference and basis for the design and selection of DC circuit breakers and the accurate setting of DC protection. Finally, the topology of hybrid DC circuit breaker is introduced in detail, and the current commutation law during the process of the fault current interruption is analyzed.
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