Analysis of Electromagnetic Emission from Contact lines of Light Rail Transit System
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Date
2014-07
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Addis Ababa University
Abstract
The implementation of Light Rail Transit System (LRTS) as an integrated form of public transportation, with the rail corridor running through city centers and connecting major commercial centers, presents a unique electromagnetic coupling scenario between sensitive installations and the dc magnetic field propagated from the LRTS. Magnetic fields created by a dc-electrified railway are a nuisance to the operation of a geomagnetic observatory and also disturb other electromagnetic studies and some researches were done using real operation measurements. Theoretical formulas and simulations that enable quantitative estimates of the magnetic effect of Addis Ababa LRT contact line including leakage currents in the ground are presented in this paper.
The sliding contact between catenary and pantograph has to transfer a large amount of current and power to the locomotive reliably. Sometimes detachment and attachment occur between the contact wire and the pantograph. Arcing from the pantograph, a commonly observed phenomenon is known to be a major source of wideband electromagnetic emission which is more pronounced during the winter.
Experience within the railway industry has shown that this source of Electromagnetic interference (EMI) and its characteristics need to be understood thoroughly for solving the associated EMI issues in the desired fashion. This thesis analyzes EMI generation from pantograph arcing, which is pantograph contact wire interaction, full loop of feeding line, which is substation, feeder line, train, return current and leakage current into the environment and ground. The methodology of the paper uses modeling of the system using mathematical modeling and simulates with MATLAB software. The result of this analysis is compared with the railway Electromagnetic Compatibility (EMC) standards and results with at 40m distance from center of track line out of the limit standard.
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Keywords
Electromagnetic field, Electromagnetic compatibility, Pantograph arcing, leakage current, feeder current