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Info iec60255 181 ed1 0 b This is a preview - click here to buy the full publication INTERNATIONAL STANDARD NORME INTERNATIONALE IEC - Edition - colour inside Measuring relays and protection equipment ?? Part Functional requirements for frequency protecti

This is a preview - click here to buy the full publication INTERNATIONAL STANDARD NORME INTERNATIONALE IEC - Edition - colour inside Measuring relays and protection equipment ?? Part Functional requirements for frequency protection Relais de mesure et dispositifs de protection ?? Partie Exigences fonctionnelles relatives aux protections de fréquence INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS ISBN - - - - Warning Make sure that you obtained this publication from an authorized distributor Attention Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé Registered trademark of the International Electrotechnical Commission Marque déposée de la Commission Electrotechnique Internationale CThis is a preview - click here to buy the full publication ?? ?? IEC - ? IEC CONTENTS FOREW ORD Scope Normative references Terms and de ?nitions Speci ?cation of the function General Input energizing quantities energizing quantities Binary input signals Functional logic Operating characteristics Reset characteristics Additional in uencing functions conditions General Speci ?c characteristics for under over frequency function Speci ?c characteristics for rate of change of frequency ROCOF function Binary output signals General Start pick-up signal Operate trip signal Other binary output signals Performance speci ?cation General E ?ective and operating ranges Accuracy related to the characteristic quantity Start time for under over frequency function Start time for rate of change of frequency ROCOF function Accuracy related to the operate time delay setting Disengaging time Reset hysteresis and reset ratio Accuracy related to restraint blocking elements Performance with harmonics Stability in case of sudden voltage change phase shift and magnitude shift Voltage input requirements Functional test methodology General Determination of steady state errors related to the characteristic quantity Accuracy of the start value Reset hysteresis or reset ratio determination Determination of the start time General Under over frequency Rate of change of frequency Determination of the accuracy of the operate time delay General Description of test method Reporting of the operate time delay accuracy CThis is a preview - click here to buy the full publication IEC - ? IEC ?? ?? Determination of disengaging time General Under over frequency Rate of change of frequency Performance with harmonics General Accuracy of the under over frequency start value in the presence of harmonics Accuracy of the ROCOF start value in the presence of harmonics Stability in the case of sudden voltage change phase shift and magnitude change General Performance in case of voltage phase shift and magnitude change Performance in case of voltage magnitude drop and restoration Documentation requirements Type test report Other user documentation Annex A normative Test signal equation with constant frequency variation df dt Annex B normative Calculation of mean median and mode B Mean B Median B Mode B Example Annex C informative Example of frequency measurement and calculation C De ?nitions C Signal observation model C General requirements on frequency measurement C General requirements on frequency measurement C Periodic algorithm C Analysis algorithm C Error minimization algorithm C Discrete Fourier transformation DFT Annex D informative Performance with inter-harmonics D General