Author(s)

L. Hu, R.E. Morrison & D.J. Young

Abstract

Comparison of physical modelling and CAD representation of compensated railway systems L. Hu,"* R.E. Morrison," D.J. Young ^ GEC Alsthom Transmission and Distribution Projects Ltd., f O Boz g7, ^aforcf ST^IAr, [/JT * also from Chongqing University, China ABSTRACT A 25kV, 75km single phase traction feeder with two SVCs has been modelled both on a physical simulator and on a CAD package (SABER). The controls of the SVCs, which use a phase locked loop technique, have been included in both simulation models. Some of the simulated results are given; comparisons made with the results obtained from each model show very good agreement INTRODUCTION Many main line railway electrification systems use 25kV ac to transmit electrical power to the locomotives. At this voltage level the railway system is usually divided into electrical sections of about 25km length. Longer sections result in excessive voltage drop (more than 25%) with severe loss of performance to the most distant locomotives. I

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