SEL-787 Family Comparison

Model FeaturesSEL-787-2XSEL-787-21SEL-787-2ESEL-787-3ESEL-787-3SSEL-787-4X
Windings Protected222334
CT/PT Inputs
Phase Voltage Inputs003330
Differential Current Inputs6669912
Neutral Current011100
VS/VBAT Channel000010
Differential and Restricted Earth Fault (REF) Elements
Differential Protection Windings (Standard)222334
REF Elements (Standard)011100
Differential Protection Windings (Winding 3 Configured for REF)223
REF Elements (Winding 3 Configured for REF)222
Protection Elements
24Volts/Hertz
25Synchronism Check
27IInverse-Time Undervoltage (Phase, Phase-to-Phase, Sequential, Vsync)
27PUndervoltage (Phase) With Inverse Characteristic
27PPPhase-to-Phase Undervoltage
27SVS Channel Undervoltage
32Directional Power
49RTDResistance Temperature Detectors (RTDs)
50NNeutral Overcurrent
50 (P,G,Q)Overcurrent (Phase, Ground, Neg. Seq.)
51 (P,G,Q)Time Overcurrent (Phase, Ground, Neg. Seq.)
51NNeutral Time Overcurrent
51PCCombined Winding Phase Time Overcurrent
51GCCombined Winding Ground Time Overcurrent
59 (P,G,Q)Overvoltage (Phase, Ground, Neg. Seq.)
59Overvoltage (Synchronism or Battery Voltage)
59IInverse-Time Overvoltage (Phase, Phase-to-Phase, Sequential, Vsync)
59SVS Channel Overvoltage
59QNegative-Sequence Overvoltage
81 (O,U)Over-/Underfrequency
87Phase Differential
Model FeaturesSEL-787-2XSEL-787-21SEL-787-2ESEL-787-3ESEL-787-3SSEL-787-4X
Additional Functions
85RIOSEL Mirrored Bits Communications
BFBreaker Failure
BWBreaker Wear Monitoring
DFREvent Reports
ENVSEL-2600 RTD Module Support*
LDPLoad Data Profiling
LGCSELogic Control Equations
LOPLoss of Potential
METHigh-Accuracy Metering
RTD10 Internal or 12 External (See ENV) RTD Inputs*
REFRestricted Earth Fault
RTURemote Terminal Unit
SERSequential Events Recorder
TFEThrough-Fault Event Monitor
PMUSynchronized Phasor Measurement
*Optional feature