6.85
Date Code 20171021 Instruction Manual SEL-421 Relay
Protection Applications Examples
345 kV Tapped Overhead Transmission Line Example
CLOEND CLSMON or Single Pole Open Delay (OFF, 0.000–16000 cycles) 10.000
SOTFD Switch-Onto-Fault Enable Duration (0.500–16000 cycles) 10.000
CLSMON Close Signal Monitor (SEL
OGIC Equation) IN102
Load Encroachment (Group)
ZLF Forward Load Impedance (0.05–64 secondary) 12.50
ZLR Reverse Load Impedance (0.05–64 secondary) 12.50
PLAF Forward Load Positive Angle (–90.0 to +90 degrees) 45.0
NLAF Forward Load Negative Angle (–90.0 to +90 degrees) –45.0
PLAR Reverse Load Positive Angle (+90.0 to +270 degrees) 135.0
NLAR Reverse Load Negative Angle (+90.0 to +270 degrees) 225.0
Phase Instantaneous Overcurrent Pickup (Group)
50P1P Level 1 Pickup (OFF, 0.25–100 A secondary) 49.80
Phase Overcurrent Definite-Time Delay (Group)
67P1D Level 1 Time Delay (0.000–16000 cycles) 0.000
Phase Overcurrent Torque Control (Group)
67P1TC Level 1 Torque Control (SELOGIC Equation) 1
Residual Ground Instantaneous Overcurrent Pickup (Group)
50G1P Level 1 Pickup (OFF, 0.25–100 A secondary) OFF
50G2P Level 2 Pickup (OFF, 0.25–100 A secondary) 1.00
50G3P Level 3 Pickup (OFF, 0.25–100 A secondary) 0.50
Residual Ground Overcurrent Definite-Time Delay (Group)
67G2D Level 2 Time Delay (0.000–16000 cycles) 0.000
67G3D Level 3 Time Delay (0.000–16000 cycles) 0.000
Residual Ground Overcurrent Torque Control (Group)
67G2TC Level 2 Torque Control (SELOGIC Equation) 32GF
67G3TC Level 3 Torque Control (SEL
OGIC Equation) 32GR
Selectable Operating Quantity Inverse-Time Overcurrent Element 1 (Group)
51S1O 51S1 Operating Quantity (IAn, IBn, ICn, IMAXn, I1L, 3I2L, 3I0n)
a
3I0L
51S1P 51S1 Overcurrent Pickup (0.25–16 A secondary) 0.96
51S1C 51S1 Inverse Time Overcurrent Curve (U1–U5) U3
51S1TD 51S1 Inverse Time Overcurrent Time Dial (0.50–15.00) 2.0
51S1RS 51S1 Inverse Time Overcurrent Electromagnetic Reset (Y, N) Y
51S1TC 51S1 Torque Control (SEL
OGIC Equation) 32GF
Zone/Level Direction (Group)
DIR3 Zone/Level 3 Directional Control (F, R) R
Directional Control (Group)
ORDER Ground Directional Element Priority (combine Q, V, I) QV
E32IV Zero-Sequence Voltage And Current Enable (SEL
OGIC Equation) 1
Table 6.21 Settings for 345 kV Tapped TX Example (Sheet 3 of 4)
Setting Prompt Entry
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