Inductive Interference in Rapid Transit Signaling Systems Volume II: Suggested Test Procedures
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1987-03-31
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Abstract:These suggested test procedures have been prepared in order to develop standard methods of analysis and testing to quantify and resolve issues of electromagnetic compatibility in rail transit operations. Electromagnetic interference, generated by rail transit propulsion equipment, can cause a transit system's signaling system to malfunction, resulting in potential reliability and safety problems. These problems have been complicated and increased by the introduction and growing use of new types of solid state propulsion control. Two types of electromagnetic interference--inductive and conductive--have been found to be the major sources of electromagnetic incompatibility between propulsion and signaling subsystems in rail transit operations. This report presents methods for detecting and quantifying the levels of inductive electromagnetic interference produced by solid state rapid transit propulsion equipment and for determining the susceptibility of signaling systems to these emissions. These methods include procedures for taking measurements in the field, the laboratory and on track circuits. As background, the mechanisms of inductive electromagnetic interference are described in the report, as well as audio-frequency track circuits and solid state propulsion control. Recording and documentation procedures for applying these suggested test procedures are provided. Appendix A in this report contains definitions of terms and systems of units. Appendix B contains sample outputs of tests using inductive recommended practices.
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