Schweitzer Engineering Laboratories SEL-421-4 - Page 353

6.17
Date Code 20171021 Instruction Manual SEL-421 Relay
Protection Applications Examples
230 kV Overhead Distribution Line Example
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
SOTF Scheme Settings (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) 0.8
52AEND 52A Pole Open Delay (OFF, 0.000–16000 cycles) OFF
CLOEND CLSMON or Single Pole 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
Phase Instantaneous Overcurrent Pickup Settings (Group)
50P1P Level 1 Pickup (OFF, 0.25–100 A secondary) 13.29
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
Selectable Operating Quantity Time Overcurrent Element Settings (Group)
51S1O 51S1 Operating Quantity (IAn, IBn, ICn, IMAXn, I1L,
3I2L, 3I0n)
a
3I0L
51S1P 51S1 Overcurrent Pickup (0.25–16 A secondary) 1.72
51S1C 51S1 Inverse-Time Overcurrent Curve (U1–U5) U3
51S1TD 51S1 Inverse-Time Overcurrent Time Dial (0.50–15.00) 1.96
51S1RS 51S1 Inverse-Time Overcurrent Electromechanical Reset (Y, N) Y
51S1TC 51S1 Torque Control (SEL
OGIC Equation) 32GF
Directional Control (Group)
ORDER Ground Directional Element Priority (combine Q, V, I) QV
E32IV Zero-Sequence Voltage And Current Enable
(SEL
OGIC Equation)
1
Pole-Open Detection Settings (Group)
EPO Pole-Open Detection (52, V) 52
SPOD Single-Pole Open Dropout Delay (0.000–60 cycles) 0.500
3POD Three-Pole Open Dropout Delay (0.000–60 cycles) 0.500
Trip Logic Settings (Group)
TR Trip (SELOGIC Equation) Z1T OR Z2T OR
51S1T
TRSOTF Switch-Onto-Fault Trip (SEL
OGIC Equation) Z2P OR Z2G OR
50P1
DTA Direct Transfer Trip A-Phase (SEL
OGIC Equation) NA
DTB Direct Transfer Trip B-Phase (SEL
OGIC Equation) NA
DTC Direct Transfer Trip C-Phase (SEL
OGIC Equation) NA
BK1MTR Manual Trip – Breaker 1 (SEL
OGIC Equation) OC1 OR
PB8_PUL
Table 6.6 Settings for 230 kV Overhead TX Example (Sheet 3 of 4)
Setting Prompt Entry