IEC 60255-8:1990

FOREWORD
PREFACE
Clause
SECTION ONE - GENERAL
l Scope and object
2 Definitions
SECTION TWO - REQUIREMENTS
3 Standard values
4 Accuracy
SECTION THREE - TEST METHODS
5 Tests related to operating characteristics and accuracy
6 Tests for thermal requirements
Figures
Appendix A - Characteristic curves, cold curves
Appendix B - Characteristic curves, hot curves
Appendix C - Example for determining accuracy

This edition supersedes the first edition of IEC 60255-8 (1978) and IEC 60255-17 (1982).Applies to dependent specified time electrical measuring relays which protect equipment from electrical thermal damage by the measurement of current flowing in protected equipment. States the particular requirements for thermal electrical relays. Is to be read in conjunction with higher level documents in the IEC 60255 series.