Abstract
Aimed at the nonlinear, asymmetric and fluctuant characteristics of the traction loads, this paper researches and analyzes the loading characteristics and power factor values of V-V, Y-D11 and Impedance-Matching traction transformers by a novel approach. Four definitions of power factor are compared-three considering harmonics and unbalances and one base only on fundamental components. This paper verifies the Impedance-Matching transformer superiority on restraining imbalance from power factor. The simulation results and actual measurement data reveal that, compared with other power factors, according to distort and imbalance, the effective power factor could be recommended for use in fairly evaluating the load characteristics for traction transformers.
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