United States Department of Transportation
i
Radiated Interference in Rapid Transit Systems. Volume 1. Theory and Data
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1988-04-01
[PDF-4.49 MB]
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Abstract:For the past eight years, the UMTA Office of Systems Engineering, U.S. Department of Transportation, has sponsored a program to delineate and mitigate the effects of electromagnetic interference (EMI) in rail transit operations. Work has proceeded under the aegis of the Rail Transit EMI/EMC Technical Working Group and has focused on 3 modes of EMI: inductive, conductive, and radiated. The purpose of this report is to outline the theory of generation and observation of unwanted radiated electromagnetic emissions in rail transit systems, and to present data for radiated emissions obtained from a number of different rapid transit systems. This theory underlies development and use of the Suggested Test Procedures for Radiated Emissions in rail transit systems found in Ref. 2 of this report. Representative radiated interference data from 3 different types of rail transit vehicles at 2 locations are presented as an example of results obtained from application of the radiated suggested procedures. The radiated emission test procedures (Ref. 2) are not only applicable to assessing radiated EMI levels from rail transit cars powered by new solid-state systems, but also those with older technology. The Radiated Suggested Test Procedures are designed to aid the skilled practitioner in acquiring data related to the operational concerns of rapid transit systems. The test procedures are based on adaptation and extensions of well-known standardized techniques previously specified by the U.S. Department of Defense, the Society of Automotive Engineers, and other standards-setting bodies.
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