This International Standard applies to traction transformers installed on board rolling stock and to the various types of inductors inserted in the power and auxiliary circuits of electric vehicles. The inductors mentioned in the first paragraph may be: - filter inductors; smoothing inductors; commutation inductors; protection inductors in static power converters; inductive shunts for traction motors; inductors used for transition between tap changer notches; braking circuit inductors and interference suppression inductors. This standard can also be applied, after agreement between user and manufacturer, to the traction transformers of three-phase a.c. line