6.16
SEL-421 Relay Instruction Manual Date Code 20171021
Protection Applications Examples
230 kV Overhead Distribution Line Example
EFLOC Fault Location (Y, N) Y
LL Line Length (0.10–999) 50
Relay Configuration (Group)
E21P Mho Phase Distance Zones (N, 1–5) 2
E21MG Mho Ground Distance Zones (N, 1–5) 2
E21XG Quadrilateral Ground Distance Zones (N, 1–5) N
ECVT Cvt Transient Detection (Y, N) N
ESERCMP Series-compensated Line Logic (Y, N) N
ECDTD Distance Element Common Time Delay (Y, N) Y
ESOTF Switch-onto-fault (Y, N) Y
EOOS Out-of-Step (Y, Y1, N) N
ELOAD Load Encroachment (Y, N) N
E50P Phase Inst./def.-time O/c Elements (N, 1–4) 1
E50G Residual Ground Inst./def.-time O/c Elements (N, 1–4) N
E50Q Negative-sequence Inst./def.-time O/c Elements (N, 1–4) N
E51S Selectable Inverse-time O/c Elements (N, 1–3) 1
E32 Directional Control (Y, AUTO, AUTO2) AUTO2
ECOMM Communications-Assisted Tripping (N, DCB, POTT,
POTT2, POTT3, DCUB1, DCUB2)
N
EBFL1 Breaker 1 Failure Logic (N, 1, 2, Y1, Y2) N
E25BK1 Synchronism Check for Breaker 1 (Y, N, Y1, Y2) N
E79 Reclosing (Y, Y1, N) N
EMANCL Manual Closing (Y, N) N
ELOP Loss-of-Potential (Y, Y1, N) Y1
EDEM Demand Metering (N, THM, ROL) N
EADVS Advanced Settings (Y, N) N
Mho Phase-Distance Element Reach (Group)
Z1MP Zone 1 Reach (OFF, 0.05–64 secondary) 1.56
Z2MP Zone 2 Reach (OFF, 0.05–64 secondary) 2.34
Mho Phase-Distance Element Time Delay (Group)
Z1PD Zone 1 Time Delay (OFF, 0.000–16000 cycles) OFF
Z2PD Zone 2 Time Delay (OFF, 0.000–16000 cycles) OFF
Mho Ground-Distance Element Reach (Group)
Z1MG Zone 1 (OFF, 0.05–64 secondary) 1.56
Z2MG Zone 2 (OFF, 0.05–64 secondary) 2.34
Zero-Sequence Current Compensation Settings (Group)
k0M1 Zone 1 ZSC Factor Magnitude (AUTO, 0.000–10) AUTO
k0A1 Zone 1 ZSC Factor Angle (–180.0 to +180.0 degrees) –3.65
Ground Phase-Distance Element Time Delay (Group)
Z1GD Zone 1 Time Delay (OFF, 0.000–16000 cycles) OFF
Z2GD Zone 2 Time Delay (OFF, 0.000–16000 cycles) OFF
Table 6.6 Settings for 230 kV Overhead TX Example (Sheet 2 of 4)
Setting Prompt Entry
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