Compensation of Voltage Drop using Substation Support Equipment for DC Feeding System

Abstract

In DC electric railways, power is supplied to trains from DC substations. The voltage gets declined at a pantograph on the way due to the voltage drop caused by impedance, in particular the resistance of feeding wires. In case the load of rolling stock gets heavy, the significant voltage drop may hinder the train from continuous operations. Two methods have been conventionally used to deter the voltage drop. One ways is to decrease resistance of the circuit by the application of feeder with bigger diameter. Another is to compensate the voltage drop by the installation of the new substation between two existing substations. These two methods are effective; however, there are problems of term and cost for installation. Based on these issues we have recently developed the new method which we call "substation support equipment". In this paper we report the basic concept and overview for the substation support equipment together with results of performance test on site and artificial fault test.