Electromagnetic Interference between Power/ Telecommunication Lines and Railway Systems

Abstract This paper presents the electromagnetic interference effects from the railway systems to electric power supplier systems and telecommunication lines. As the railway system emits the electromagnetic radiation mainly from 30 MHz to 1 GHz frequency bands, the interfering noise can be induced to the nearby power lines or telecommunication lines in the frequency band of same frequency spectrum or higher. This paper modeled and analyzed the radiated electromagnetic emission levels from the railway system to validate the electromagnetic interference from the railway system. As the first step, the electromagnetic coupling between the railway system and overhead power lines crossing the railways were modeled and analyzed. And then, the electromagnetic coupling between the railway system and telecommunication lines in the tunnel were modeled and analyzed. In the analysis result, it was shown that the radiated electromagnetic interference level from the railway system is so considerably low that the induced noise level from the railway systems to the electricity supplier and telecommunication systems would be an insignificant level.