IEC 60255-151:2009
Current
The latest, up-to-date edition.
Measuring relays and protection equipment - Part 151: Functional requirements for over/under current protection
Hardcopy , PDF 1 User , PDF 3 Users , PDF 5 Users , PDF 9 Users
English - French
28-08-2009
FOREWORD
1 Scope and object
2 Normative references
3 Terms and definitions
4 Specification of the function
4.1 General
4.2 Input Energizing quantities/energizing quantities
4.3 Binary input signals
4.4 Functional logic
4.4.1 Operating characteristics
4.4.2 Reset characteristics
4.5 Binary output signals
4.5.1 Start (pick-up) signal
4.5.2 Operate (trip) signal
4.5.3 Other binary output signals
4.6 Additional influencing functions/conditions
4.7 Specific characteristics
5 Performance specification
5.1 Accuracy related to the characteristic quantity
5.2 Accuracy related to the operate time
5.3 Accuracy related to the reset time
5.4 Transient performance
5.4.1 Transient overreach
5.4.2 Overshoot time
5.4.3 Response to time varying value of the characteristic
quantity
5.5 Current transformer requirements
6 Functional test methodology
6.1 General
6.2 Determination of steady state errors related to the
characteristic quantity
6.2.1 Accuracy of setting (start) value
6.2.2 Reset ratio determination
6.3 Determination of steady state errors related to the
start and operate time
6.4 Determination of steady state errors related to the
reset time
6.5 Determination of transient performance
6.5.1 General
6.5.2 Transient overreach
6.5.3 Overshoot time
6.5.4 Response to time varying value of the characteristic
quantity for dependent time relays
7 Documentation requirements
7.1 Type test report
7.2 Other user documentation
Annex A (normative) Constants for dependent time
operating and reset characteristics
Annex B (informative) Reset time determination for relays
with trip output only
Bibliography
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