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김대환(Kim Daehwan),신명호(Shin Myoungho) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
Electric railroad systems consist of rolling stock, track, signal and catenary system. In the catenary system, one of the most important factors is the impedance according to the design and characteristic. Before the catenary system is designed, the impedance should be precedently researched. The railroad catenary system is complex system which is composed by five conductors. The five conductors classify up-down feeders, rails, overhead earth wires, ground wires and catenary conductor group. Feeders and messenger wires are included in the catenary group because of a conductor by using droppers. On account of existing five conductors, the impedance divides into the self impedance and mutual impedance. The self impedance defines a drop of electric pressure rates per unit length regarding the feedback current to the ground through the catenary. The mutual impedance defines the induced voltage rates from the current of a conductor to another conductor. In this paper, we suggest a geometrical model and a equivalent conductor model by using geometric mean radius of five conductors in the catenary system. Also, we calculate demanded parameter values in the model. By using those, line constants of five conductors are analyzed by applying the equivalent method called as the condensed joint matrix.