International standard for combined instrument transformers updated

摘要

Now available as a final draft standard, IEC 61869-4 Ed.1.0 is an impending revision of the International Electrotechnical Commission’s additional rules for newly-made combined transformers intended for use with measuring instruments and protective devices at 15-100 Hz. Specifically this includes additional tests and requirements for current and inductive voltage transformers used in this type of equipment.