The no load operation of Y, d11 traction substation is analysed systematically which results in the high voltage side phase A?C over compensation, phase B Less compensation; the active power circulation of phase A?C and the three phases symmetric power system and because the low voltage side phase a?c unsymmetric fixed reactive power compensation in Y, d11 traction substation are reached.

This paper analyzes no-load voltage building process of a△-connected three-phase induction generator under single-phase operation.

Based on the theoretical analysis of each factor inducing vibration of core and winding, the experiments validated that the fundamental frequency magnitudes of core and winding vibrations are linear to square of no-load voltage and loading current respectively.