IEC 62505-3-3:2020 gives particular requirements for voltage transformers used in a.c. single-phase railway applications, fixed installations. Applies to inductive voltage transformers used at traction voltages and frequencies according to IEC 60850.
IEC 62505-3-3 Ed. 2.0 en:2020
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Railway applications – Fixed installations – Particular requirements for AC switchgear – Part 3-3: Measurement, control and protection devices for specific use in AC traction systems – Voltage transformers