electric traction load;  power quality;  negative order;  Harmonics

Taking the Y/△-11 wiring traction transformer as an example, the law of negative sequence current and high harmonic generated by electric traction load is analyzed, and the measured data are given, and finally the corresponding treatment measures are proposed, including reasonable allocation of reactive power compensation capacity of the two power supply arms, comprehensive compensation of reactive power and negative sequence using the Steinmetz principle, and installation of filters or static reactive power compensation devices on the low-voltage side of the traction substation.