City rail train auxiliary power supply system

The utility model discloses a city rail train auxiliary power supply system, including two supplementary power supply unit (1), supplementary power supply unit (1) is including two power supply generating lines (2) and two at least supplementary power supply (3), power supply generating line (2) is connected with one supplementary power supply (3) at least, ordinary AC load (4) of city rail train only are connected with a power supply generating line (2), crucial AC load (5) of city rail train are connected with two power supply generating lines (2) simultaneously. The utility model provides an under the power supply mode that is incorporated into the power networks at present, the generating line short circuit brings the paralytic problem of train, has the power supply mode that can switch city rail train in a flexible way, has crossfeed, extension power supply concurrently and is incorporated into the power networks the advantage of power supply. 本实用新型公开了种城轨列车辅助供电系统，包括两个辅助供电单元（1），所述辅助供电单元（1）包括两条供电母线（2）和至少两台