A STUDY OF TRANSIENT INDUCED VOLTAGES ON A MAGLEV TRAIN COIL SYSTEM

The paper discusses transient induced voltages to a coil system of a m agnetic-levitation (MAGLEV) train planned in Japan from an overhead gr ound wire (GW) which protects the coil system from a lightning stroke. A simplified lumped-circuit coil model is developed based on a two-po rt theory of an L equivalent circuit of a distributed-parameter line. Its impedances are evaluated from the impedance and admittance matrice s of an overhead multiconductor system, which represents a coil, using the EMTP CABLE CONSTANTS. Calculated results of transient induced vol tages by the proposed coil model agree satisfactorily with experimenta l results. It is made clear that the greater the grounding resistance and the smaller the separation between the coil and the GW and the spa n length of grounding, the greater the induced voltage.