NATIONAL FOREWORD

This Indian Standard (Part 2) which is identical with IEC 62689-2 : 2016 ‘Current and voltage sensors or detectors, to be used for fault passage indication purposes — Part 2: System aspects’ issued by the International Electrotechnical Commission (IEC) was adopted by the Bureau of Indian Standards on recommendation of the Instrument Transformers Sectional Committee and approval of the Electrotechnical Division Council.

The standard is a product family standard for current and voltage sensors or detectors, to be used for fault passage indication purposes by suitable devices or functions, indicated as fault passage indicator (FPI) or distribution substation unit (DSU), depending on their performances.

This standard is published in two parts. The other part in this series is:

Part 1 General principles and requirements

The text of IEC Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminologies and conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’.

b) Comma (,) has been used as a decimal marker, while in Indian Standards, the current practice is to use a point (.) as the decimal marker.