Calculation of Distance Protection Setting of Regional Power Grid Considering Traction Power Supply

Abstract

Due to the asymmetry of the traction transformer, there is a problem in the calculation of the measured impedance when the line distance protection on the grid side cooperates with the traction transformer, which causes problems for the setting calculation personnel whether the distance protection can avoid the faults on the other side of the traction transformer. Firstly, the influence of traction substation on distance protection is studied and analyzed. Secondly, the analysis models of single-phase Ii traction transformer, V/v wiring traction transformer and V/x wiring traction transformer are built. Finally, the measurement impedance correction scheme of the protection on the grid side distance after the other side faults of traction transformer is analyzed, and the setting calculation proposal of distance protection is given.