1.7
Date Code 20171021 Instruction Manual SEL-421 Relay
Introduction and Specifications
Models and Options
SEL-421 Versions and Supported Features
SEL-421 Features -4 -5
Protection
21MG Mho Ground-Distance and 21MP Mho Phase Distance Standard Standard
21XG Quadrilateral Ground-Distance and 21XP Quadrilateral Phase Distance Standard Standard
High-Speed Distance and High-Speed Directional Standard
50N/G Ground, 50P Phase, and 50Q Negative-Sequence—O/C Standard Standard
51N/G Ground, 51P Phase, and 51Q Negative-Sequence Time—O/C Standard Standard
67N/G Ground, 67P Phase, and 67Q Neg.-Seq. Directional—O/C Standard Standard
Programmable Analog Math Standard Standard
Out-of-Step Trip and Block Standard Standard
Load-Encroachment Supervision Standard Standard
Switch-Onto-Fault Standard Standard
Single-Pole Trip Standard Standard
M
IRRORED BITS Communications Standard Standard
Zone/Level Timers Standard Standard
Pilot Protection Logic Standard Standard
Series-Compensated Line Logic Standard
Instrumentation and Control
79 Automatic Reclosing, Voltage Check on Closing, 25 Synchronism Check Standard Standard
Fault Locating Standard Standard
SEL
OGIC Control Equations Standard Standard
Maximum Automation SEL
OGIC Control Equations 100 1000
Substation Battery Monitor Standard Standard
Breaker Wear Monitor Standard Standard
Event Report (Multicycle Data) and Sequential Events Recorder Standard Standard
Instantaneous, RMS, and Demand Meter Standard Standard
DNP3 Level 2 Outstation Standard Standard
Synchrophasors (IEEE C37.118 and SEL Fast Message) Standard Standard
Remote Synchrophasor Measurement
Time-Domain Link (TiDL) Remote Data Acquisition Optional Optional
Contact Input Option
Main Board—Optoisolated Level-Sensitive Contact Inputs Standard Standard
INT1 Interface Board—User-Settable Level-Sensitive Contact Inputs Optional Optional
INT2 Interface Board—Optoisolated Level-Sensitive Contact Inputs Standard Standard
INT3 Interface Board—Optoisolated Level-Sensitive Contact Inputs Standard Standard
INT4 Interface Board—Optoisolated Level-Sensitive Contact Inputs
INT5 Interface Board—User-Settable Level-Sensitive Contact Inputs Optional Optional
INT6 Interface Board—User-Settable Level-Sensitive Contact Inputs Optional Optional
INT7 Interface Board—Optoisolated Level-Sensitive Contact Inputs Standard Standard
INT8 Interface Board—Optoisolated Level-Sensitive Contact Inputs Standard Standard
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