MiCOM P921/P922/P923 - Schneider - error

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P92x/EN FT/H42Page 4/70Technical GuideUser GuideMiCOM P921/P922/P923PRELIMINARY DEFINITIONSIn this manual, all the following definitions and notations will be used:VrResidual voltage = 3 x zero sequence voltageV0Zero sequence voltageV0derDerived V0 sequence voltage (calculated homopolarvoltage)V1, V2 Positive and negative sequence voltagesVA, VB, VCPhase voltagesVAB, VBC, VCALine voltagesVnRated voltageVTVoltage transformerDMTDefinite minimum timeIDMTInverse definite minimum time
Technical GuideP92x/EN FT/H42User GuideMiCOM P921/P922/P923 Page 5/701. INTRODUCTION TO THE USER INTERFACES AND SETTINGS OPTIONSMiCOM P921 P922 and P923 are fully numerical relays designed to performelectrical protection and control functions.The following section describes the MiCOM P92x range and the main differencesbetween the different models.MiCOM relays are powered either from a DC (2 voltage ranges) or an AC auxiliarypower supply.Using the front panel, the user can easily navigate through the menu and accessdata, change settings, read measurements, etc.Eight LEDs situated in the front panel help the user to quickly know the status of therelay and the presence of alarms. Alarms that have been detected are stored andcan be displayed on the back-lit LCD.Any short time voltage interruption (
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MiCOMP921/P922/P923Voltage and Freq
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P92x/EN T/H42Page 2/2Technical Guid
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Pxxx/EN SS/G11Safety Section Page 1
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IntroductionP92x/EN IT/H42MiCOM P92
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Getting StartedP92x/EN GS/F22MiCOM
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InstallationP92X/EN IN/F22MiCOM P92
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MiCOM P921/P922/P923 - Schneider - error

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