Study on the Test Circuit of Subway DC Traction Power Supply System

The safe and reliable operation of the subway DC traction power supply system is the basis for the safe operation of modern urban rail transit. The development of test circuits for superconducting hybrid DC circuit breakers is essential for DC rail applications. This paper came to the conclusion about the short-circuit characteristics under faults f, e, and d based on the test circuit and calculation principle. The results indicate that the peak and rate of rise of the current are higher the closer the fault is near the rectifier outlet. It serves as a guide and foundation for the design and selection of DC circuit breakers.