United States Department of Transportation
i
Effect of Solid-State Power-Converter Harmonics on Electric-Power-Supply Systems
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1973-03-01
[PDF-1.20 MB]
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Abstract:The United States utility industry has not set suitable standards, other than TIF (Telephone Interference Factor), for controlling the design of solid-state wayside and on-board power-conversion equipment, to limit the harmonic currents and voltages in both the transit and electric-power-supply systems. To reduce interference with telecommunications and control equipment, and to insure reliable operation of power equipment, the manufacturers can attenuate the power harmonics by selecting the converter pulse number and by the use of filters. Techniques for calculating the harmonic voltages have been developed and can be applied to transit systems. The authors propose a standard of 10% of fundamental amplitude for each harmonic voltage at the connection point to the utility and 3% for each harmonic voltage within the transit system such as the power rails.
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