IEC 61869-6: The IEC 61850 Interface for Instrument Transformers

IEC TC 38 has published the new Committee Draft (CD) for the Digital interface for instrument transformers (38/418/CD):

IEC 61869: Instrument Transformers -
Part 9: Digital interface for instrument transformers

This standard defines a method for digital communications of instrument transformer
measurements. It is based on the IEC 61850 series of standards, IEC 60044-8 and the UCA International User Group document Implementation Guideline for Digital Interface to Instrument Transformers Using IEC 61850-9-2 (known as 9-2LE). It includes additional improvements including IEC 61588 network based time synchronization, and frequency response requirements.

This new standard will be part a product family standard for instrument transformers. It provides an application of the horizontal standard series IEC 61850, which details layered substation communication architecture in the world of instrument transformers.
By providing tutorial material such as examples and explanations, it also gives an access for instrument transformer, protective relay and meter experts to concepts and methods applied in the IEC 61850 series.

An overview about the standard series 61869 is shown in the next picture:

• Part 9 Replaces IEC 60044-8 digital solution.
• Provides a product standard for instrument transformers with a digital interface according to 61850; similar to what IEC 62271-3 is doing for switchgear.
• Includes backward compatibility for the UCA International User Group Implementation Guideline for Digital Interface to Instrument Transformers Using IEC 61850-9-2.
• Uses IEC 61588-Ed2 for time synchronization, with an option for 1PPS.

The CD ballot closes 2011-11-04.

Contact your national IEC TC 38 or TC 57 committee to get a copy of the CD.