IEC 60255-151 : 1.0

Table of Contents

FOREWORD<br>1 Scope and object<br>2 Normative references<br>3 Terms and definitions<br>4 Specification of the function<br>&nbsp;&nbsp;4.1 General<br>&nbsp;&nbsp;4.2 Input Energizing quantities/energizing quantities<br>&nbsp;&nbsp;4.3 Binary input signals<br>&nbsp;&nbsp;4.4 Functional logic<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.4.1 Operating characteristics<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.4.2 Reset characteristics<br>&nbsp;&nbsp;4.5 Binary output signals<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.5.1 Start (pick-up) signal<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.5.2 Operate (trip) signal<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.5.3 Other binary output signals<br>&nbsp;&nbsp;4.6 Additional influencing functions/conditions<br>&nbsp;&nbsp;4.7 Specific characteristics<br>5 Performance specification<br>&nbsp;&nbsp;5.1 Accuracy related to the characteristic quantity<br>&nbsp;&nbsp;5.2 Accuracy related to the operate time<br>&nbsp;&nbsp;5.3 Accuracy related to the reset time<br>&nbsp;&nbsp;5.4 Transient performance<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.4.1 Transient overreach<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.4.2 Overshoot time<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.4.3 Response to time varying value of the characteristic<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;quantity<br>&nbsp;&nbsp;5.5 Current transformer requirements<br>6 Functional test methodology<br>&nbsp;&nbsp;6.1 General<br>&nbsp;&nbsp;6.2 Determination of steady state errors related to the<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;characteristic quantity<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.2.1 Accuracy of setting (start) value<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.2.2 Reset ratio determination<br>&nbsp;&nbsp;6.3 Determination of steady state errors related to the <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;start and operate time<br>&nbsp;&nbsp;6.4 Determination of steady state errors related to the <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;reset time<br>&nbsp;&nbsp;6.5 Determination of transient performance<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.5.1 General<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.5.2 Transient overreach<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.5.3 Overshoot time<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.5.4 Response to time varying value of the characteristic<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;quantity for dependent time relays<br>7 Documentation requirements<br>&nbsp;&nbsp;7.1 Type test report<br>&nbsp;&nbsp;7.2 Other user documentation<br>Annex A (normative) Constants for dependent time<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;operating and reset characteristics<br>Annex B (informative) Reset time determination for relays<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;with trip output only<br>Bibliography

Abstract

Describes minimum requirements for over/under current relays.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	International Electrotechnical Committee
Pages
ISBN
Committee	TC 95