Schweitzer Engineering Laboratories SEL-421-4 - Page 386

6.50
SEL-421 Relay Instruction Manual Date Code 20171021
Protection Applications Examples
500 kV Parallel Transmission Lines With Mutual Coupling Example
Mho Ground-Distance Element Reach (Group)
Z1MG Zone 1 (OFF, 0.05–64  secondary) 3.18
Z2MG Zone 2 (OFF, 0.05–64  secondary) 4.78
Z3MG Zone 3 (OFF, 0.05–64  secondary) 4.78
Quadrilateral Ground-Distance Element Reach (Group)
XG1 Zone 1 Reactance (OFF, 0.05–64  secondary) 3.18
RG1 Zone 1 Resistance (0.05–50  secondary) 7.96
XG2 Zone 2 Reactance (OFF, 0.05–64  secondary) 4.78
RG2 Zone 2 Resistance (0.05–50  secondary) 12.00
XG3 Zone 3 Reactance (OFF, 0.05–64  secondary) 4.78
RG3 Zone 3 Resistance (0.05–50  secondary) 15.00
XGPOL Quadrilateral Ground Polarizing Quantity (I2, IG) I2
TANGG Nonhomogeneous Correction Angle
(–40.0 to +40.0 degrees)
0.0
Zero-Sequence Current Compensation Factor (Group)
k0M1 Zone 1 ZSC Factor Magnitude (AUTO, 0.000–10) 0.880
k0A1 Zone 1 ZSC Factor Angle
(–180.0 to +180.0 degrees)
–7.6
k0M Forward Zones ZSC Factor Magnitude (0.000–10) 1.540
k0A Forward Zones ZSC Factor Angle
(–180.0 to +180.0 degrees)
–9.0
k0MR Reverse Zones ZSC Factor Magnitude (0.000–10) 1.540
k0AR Reverse Zones ZSC Factor Angle
(–180.0 to +180.0 degrees)
–9.0
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 Settings
ESPSTF Single-Pole Switch-Onto-Fault (Y, N) Y
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)
10.000
CLOEND CLSMON or Single Pole Open Delay
(OFF, 0.000–16000 cycles)
OFF
SOTFD Switch-Onto-Fault Enable Duration
(0.500–16000 cycles)
10.000
CLSMON Close Signal Monitor (SEL
OGIC Equation) NA
Table 6.13 Settings for 500 kV Parallel TX Example (Sheet 4 of 7)
Setting Prompt Entry