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Optimized Parallel Feeder for Achieving Low Magnetic Fields in an Overhead-Feeder-Type DC Rail System

The purpose of this paper is to demonstrate the use of an optimized parallel feeding system to achieve low magnetic field in the overhead-feeder-type dc rail system. Traction conductors for electrified railways often produce very high electromagnetic fields especially at locations close to the railway, consequently posing an electromagnetic interference threat to any sensitive neighboring systems. This paper describes a technique for reducing the magnetic fields generated by the traction conductors, to as low as a few milliGauss, for achieving electromagnetic compatibility in a dc rail system design. It also shows how the optimization of the rail system conductors’ cross section, especially the feeder cables, can improve cancellation of the generated magnetic fields.