MiCOM P921/P922/P923 - Schneider - error

P92x/EN IT/H42Page 6/6IntroductionMiCOM P921/P922/P9234. MAIN FUNCTIONSThe following table shows the functions available for the different models of the MiCOMP92x range of relays.PROTECTION FUNCTIONS OVERVIEW P921 P922 P923Configuration depending on the number and type ofvoltage transformersPhase-to-neutral or phase-to-phase voltageprotectionX X XX X X27 Phase under voltage (AND/OR logic) X X X59 Phase over voltage (AND/OR logic) X X XSettable hysteresis X X X59N Zero-sequence over voltage X X X59N Derived V0 sequence over voltage X X47 Negative sequence over voltage - X X27D Positive sequence under voltage - X X81U/81O Under/over frequency - X X81R Rate of change of Frequency - - XDelta U / Delta TXBlocking logic X X XUnder voltage Blocking (settable for P923) - X XGENERAL FUNCTIONSDigital inputs 2 5 5Output relays 4 8 8Remote communication (RS485 port) X X XLocal communication (RS232 port) X X XEvent recording - 250 250Fault recording - 25 25Disturbance recording - 5 5Setting group 1 2 2Time synchronisation (via digital input)XLogic equation (AND / OR and NOT gates) X X XFrequency change of rate of frequency (F + df/dt)XVT Supervision X XCB Supervision X X X