R.10.16
SEL-421 Relay Reference Manual Date Code 20111215
Settings
Group Settings
The number of pickup settings in Table 10.32 is dependent on Group setting
E21P := 1
–5. When E21P := N, no settings are made for Table 10.32.
Table 10.31 Relay Configuration
Label Prompt Default Value
E21P Mho Phase Distance Zones (N, 1–5) 3
E21MG Mho Ground Distance Zones (N, 1–5) 3
E21XG Quadrilateral Ground Distance Zones (N, 1–5) N
ECVT Capacitive Voltage Transformer Transient Detection
(Y, N)
N
ESERCMP Series-Compensated Line Logic (Y, N) N
ECDTD Distance Element Common Time Delay (Y, N) N
ESOTF Switch-Onto-Fault (Y, N) Y
EOOS Out-of-Step (Y, N) N
ELOAD Load Encroachment (Y, N) Y
E50P Phase Instantaneous Definite-Time Overcurrent
Elements (N, 1–4)
1
E50G Residual Ground Instantaneous Definite-Time
Overcurrent Elements (N, 1–4)
N
E50Q Negative-Sequence Instantaneous Definite-Time
Overcurrent Elements (N, 1–4)
N
E51S Selectable Operating Quantity Inverse Time
Overcurrent Element (N, 1–3)
1
E32 Directional Control (Y, AUTO) AUTO
ECOMM Communications-Assisted Tripping
(N, DCB, POTT, POTT2, POTT3, DCUB1, DCUB2)
POTT
EBFL1 Breaker 1 Failure Logic (N, 1, 2) N
EBFL2 Breaker 2 Failure Logic (N, 1, 2) N
E25BK1 Synchronism Check for Breaker 1 (Y, N) N
E25BK2 Synchronism Check for Breaker 2 (Y, N) N
E79 Reclosing (Y, Y1, N) Y
EMANCL Manual Closing (Y, N) Y
ELOP Loss-of-Potential (Y, Y1, N) Y1
EDEM Demand Metering (N, THM, ROL) N
EADVS Advanced Settings (Y, N) N
Table 10.32 Mho Phase Distance Element Reach (Sheet 1 of 2)
Default Value
Label Prompt 5 A 1 A
ZIP Zone 1 Reach
(OFF, 0.05–64 secondary) 5 A
(OFF, 0.25–320 secondary) 1 A
6.24 31.2
Z2P Zone 2Reach
(OFF, 0.05–64 secondary) 5 A
(OFF, 0.25–320 secondary) 1 A
9.36 46.8
Z3P Zone 3 Reach
(OFF, 0.05–64 secondary) 5 A
(OFF, 0.25–320 secondary) 1 A
1.87 9.35
NOTE: The SEL-421-1 and the
SEL-421-2 do not provide
series-compensated line protection
logic. This setting is unavailable in the
SEL-421-1 and the SEL-421-2.
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