EN 61869-4

EN 61869-4 Instrument transformers - Part 4: Additional requirements for combined transformers - IEC 61869-4:2013 applies to newly-manufactured combined transformers for use with electrical measuring instruments and electrical protective devices at frequencies from 15 Hz to 100 Hz. The requirements and tests of this standard, in addition to the requirements and tests of IEC 61869-1, IEC 61869-2 and IEC 61869-3 cover current and inductive voltage transformers that are necessary for combined instrument transformers. This standard replaces IEC 60044-3: Combined transformers.

Original English text of CSN EN Standard.
The price of the Standard included all amendments and correcturs.