Revised Standard from Last Update.

NATIONAL FOREWORD

This Indian Standard which is identical with International Publication IEEE Std C57.155TM-2014 ‘IEEE guide for interpretation of gases generated in natural ester and synthetic ester-immersed transformers’ issued by The Institute of Electrical and Electronics Engineers was adopted by the Bureau of Indian Standards on the recommendation of the Fluids for Electrotechnical Applications Sectional Committee and approval of the Electrotechnical Division Council.

This Indian National Standard is made available under license from IEEE and is an adoption of IEEE Std C57.155-2014 ‘‘IEEE Guide for Interpretation of Gases Generated in Natural Ester and Synthetic Ester-Immersed Transformers’’, 445 Hoes Lane Piscataway, NJ, 08854, USA. This Indian National Standard is only valid in India as an Indian National Standard. No changes have been made to the adopted IEEE Standard except those that may be included as Country-Specific Changes in a front matter or an attached informative annex.

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

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