Short Circuit Impedance Analysis for Novel AT Power Traction Network

The AT (Auto Transformer) power mode with parallel connection is applied on dedicated passenger lines in China on a large scale. In the power supply mode, the traction transformer is single phase with mid-point connected to the ground in its secondary side. High manufacturing cost is the shortage of this type of transformer. A new AT power supply mode was brought forward in [1]. The traction transformer is single phase without mid-point connected to the ground in its secondary side Based on the characteristic of this power supply mode and generalized method of symmetrical components (GMSC), the short circuit impedance was analyzed. The impedance characteristic of single line and double lines running mode were shown as impedance-distance curve. According to the curve, it show research on fault location of this type of power supply mode is needed.