Schweitzer Engineering Laboratories SEL-421-4 - Page 420

6.84
SEL-421 Relay Instruction Manual Date Code 20171021
Protection Applications Examples
345 kV Tapped Overhead Transmission Line Example
E50G Residual Ground Inst./Def.-Time O/C Elements (N, 1–4) 3
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)
DCB
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) 3.20
Z2MP Zone 2 Reach (OFF, 0.05–64  secondary) 11.00
Z3MP Zone 3 Reach (OFF, 0.05–64  secondary) 50.5
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
Z3PD Zone 3 Time Delay (OFF, 0.000–16000 cycles) OFF
Mho Ground-Distance Element Reach (Group)
Z1MG Zone 1 (OFF, 0.05–64  secondary) 3.20
Z2MG Zone 2 (OFF, 0.05–64  secondary) 11.00
Z3MG Zone 3 (OFF, 0.05–64  secondary) 50.5
Zero-Sequence Current Compensation Factor (Group)
k0M1 Zone 1 ZSC Factor Magnitude (AUTO, 0.000–10) 0.750
k0A1 Zone 1 ZSC Factor Angle (–180.00 to +180 degrees) –16.87
Ground-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
Z3GD Zone 3 Time Delay (OFF, 0.000–16000 cycles) OFF
Distance Element Common Time Delay (Group)
Z1D Zone 1 Time Delay (OFF, 0.000–16000 cycles) 0.000
Z2D Zone 2 Time Delay (OFF, 0.000–16000 cycles) 20.000
Z3D Zone 3 Time Delay (OFF, 0.000–16000 cycles) 0.000
SOTF Scheme (Group)
ESPSTF Single-Pole Switch-Onto-Fault (Y, N) N
EVRST Switch-Onto-Fault Voltage Reset (Y, N) Y
VRSTPU Switch-Onto-Fault Reset Voltage (0.60–1.00 pu) 0.60–1.00 pu
52AEND 52A Pole Open Time Delay (OFF, 0.000–16000 cycles) OFF
Table 6.21 Settings for 345 kV Tapped TX Example (Sheet 2 of 4)
Setting Prompt Entry