Foreword?(This Foreword is not a part of ANSI/IEEE C57.13.1-1981@ IEEE Guide for Field Testing of Relaying Current Transformers.) This guide was prepared by a Working Group of the Relay Input Sources Subcommittee of the IEEE Power System Relaying Committee of the IEEE Power Engineering Society. The working group expresses its gratitude to past members@ members of the Relay Input Sources Subcommittee@ Power System Relaying Committee@ Liaison Committees@ and groups who have contributed their time and knowledge in preparing this guide.