IS/IEC 60255 : Part 187 : Sec 1 : 2021 Measuring Relays and Protection Equipment - Part 187 Functional Requirements for Differential Protection - Section 1 Restrained and Unrestrained Differential Protection of Motors, Generators and Transformers

NATIONAL FOREWORD

This Indian Standard which is identical to IEC 60255-187-1 : 2021 'Measuring relays and protection equipment - Part 187-1: Functional requirements for differential protection - Restrained and Unrestrained differential protection of motors, generators and transformers' issued by the International Electrotechnical Commission (IEC) was adopted by the Bureau of Indian Standards on the recommendation of the Power Systems Relays Sectional Committee and approval of the Electrotechnical Division Council.