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This standard defines the supply voltages of traction systems for railways. It covers: Standardized AC and DC voltages. Voltage fluctuations and limits. Methods for testing and measurement. System compatibility for international rail transit. iec 60850 pdf free download link
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: Defines the standard supply voltages used for DC and AC traction systems (e.g., 750V DC, 1500V DC, 15kV AC, and 25kV AC). Permissible Limits Part 1: Introduction and overview : Defines the