A Study on Analysis of Unbalanced Load in Railway

초록

To model unbalanced load in railway system, four-port network model is fit in general electric railway system composed by contact wires, rails and feeders. Four-port network model has two input ports, two output ports and a basic port. The entire system could be easily modeled by the combination of the four-port representation of each component in parallel and/or series. This paper proposed a new analysis model to more effectively estimate voltage unbalance. A simple electric circuit calculation for scott transformer is performed and numerical calculations are done when a 20MVA load is on only phase M, only phase T, or both and a power factor of load is 0.9. Calculations are compared with simulations. Most of the results are almost same.