The functions of the relay are selected with the switches of switchgroupsSGF, SGB, SGR and SGL. The checksums of the switchgroups are foundunder SETTINGS in the HMI menu. The functions of the switches areexplained in detail in the corresponding SG_ tables.5.1.4. Protection5.1.4.1. Block diagramLED1LED2LED3LED4LED5LED6LED7LED8UabUbcUcaPO1PO2PO3SO1SO2SO3SO4SO5SGB1...5SGR1...8UnSGL1...8SGF1...SGF5UabUbcUcaUnCBFAILUabUbcUcaUUnUn59N-1 59N-227P-159P-127P-2 / 27D59P-2 / 47NPSPPSNPSPPSProgrammableLEDsDisturbance recorder(4 analog + up to 8 digital channels)Digital outputs(Output contacts)IRF TARGETPICKUP/ALARM TARGETTRIP TARGETIRF target LED (green)Pickup/Alarm (yellow) andtrip (red) target LEDs59P-1 Pickup59P-1 Trip59P-2 / 47 Pickup59P-2 / 47 Trip27P-1 Pickup27P-1 Trip27P-2 / 27D Pickup27P-2 / 27D Trip59N-1 Pickup59N-1 Trip59N-2 Pickup59N-2 TripExt TripThe dashed line indicates optional functionality.1) Clear targets by the digital input signal2) Clear targets and unlatch output contacts by thedigital input signal3) Reset targets and memorized values; unlatch outputcontacts by the digital input signalOptional digitalinputs(I/O module)Digital inputs DI1DI2DI3DI4DI5Switchgroups fordigital inputs Protection relay functionsAnalog inputsSwitchgroups forprogrammable LEDsSwitchgroups foroutput contacts59P-1 Pickup59P-1 Trip59P-2 / 47 Pickup59P-2 / 47 Trip27P-1 Pickup27P-1 Trip27P-2 / 27D Pickup27P-2 / 27D Trip59N-1 Pickup59N-1 Trip59N-2 Pickup59N-2 TripTrip lockout59P-1 Trip59P-2 / 47 Trip27P-1 Trip27P-2 / 27D Trip59N-1 Trip59N-2 TripTrip lockoutDI1DI2DI3DI4DI5Reset 1 1)Reset 2 2)Reset 3 3)Setting groupTime syncExt TripExt Trig CBFAILExt Trig Trip lockoutTrip lockout resetBlock 59P-1Block 59P-2 / 47Block 27P-1Block 27P-2 / 27DBlock 59N-1Block 59N-2DI1DI2DI3DI4DI5PickupTripPO1EXT TRIG PO2BlockPickupTripBlockBlockPickupTripBlockBlockPickupTripTrip lockoutTrip lockoutExt TrigResetPO3Optional digitaloutputs(I/O module)WarningBlockIRFPickupTripPickupTripA052076Fig. 5.1.4.1.-1 Block diagram5.1.4.2. Overvoltage protectionThe overvoltage protection can be based on either conventional voltagemeasurement or calculated negative phase-sequence voltage.The low-set overvoltage element 59P-1 is based on conventional voltagemeasurement.22REU 610 Voltage RelayTechnical Reference Manual - ANSI Version1MRS755972