Schweitzer Engineering Laboratories SEL-421-4 - Table 8.48 Load Encroachment

8.20
SEL-421 Relay Instruction Manual Date Code 20171021
Settings
Group Settings
Make Table 8.48 settings when Group setting ELOAD := Y.
R1R6 Zone 6 Resistance—Right
(0.05 to 140 secondary) 5 A
(0.25 to 700  secondary) 1 A
21.0 105 0.01
X1B7
a
Zone 7 Reactance—Bottom
(–0.05 to –140  secondary) 5 A
(–0.25 to –700  secondary) 1 A
–23.0 –115 0.01
X1B6
a
Zone 6 Reactance—Bottom
(–0.05 to –140  secondary) 5 A
(–0.25 to –700  secondary) 1 A
–21.0 –105 0.01
R1L7
a
Zone 7 Resistance—Left
(–0.05 to –140  secondary) 5 A
(–0.25 to –700  secondary) 1 A
–23.0 –115 0.01
R1L6
a
Zone 6 Resistance—Left
(–0.05 to –140  secondary) 5 A
(–0.25 to –700  secondary) 1 A
–21.0 –105 0.01
50ABCP
a
Positive-Sequence Current Supervision
(1.00–100 A secondary) 5 A
(0.20–20 A secondary) 1 A
1 0.2 0.01
50QUBP
a
Negative-Sequence Current Supervision
(OFF, 0.50–100 A secondary) 5 A
(OFF, 0.10–20 A secondary) 1 A
OFF OFF 0.01
UBD
a
Negative-Sequence Current Unblock Delay
(0.500–120 cycles)
0.500 0.500 0.125
UBOSBF
a
Out-of-Step Angle Unblock Rate (1–10) 4 4 1
OOSPSC Number of Pole Slips Before Tripping (1-10) 1 1 1
a
Setting only available when Group setting EADVS := Y.
Table 8.48 Load Encroachment
Setting Prompt
Default Value
Increment
5 A 1 A
ZLF Forward Load Impedance
(0.05–64  secondary) 5 A
(0.25–320  secondary) 1 A
9.22 46.1 0.01
ZLR Reverse Load Impedance
(0.05–64  secondary) 5 A
(0.25–320  secondary) 1 A
9.22 46.1 0.01
PLAF Forward Load Positive Angle (–90 to +90 degrees) 30.0 30.0 0.1
NLAF Forward Load Negative Angle (–90 to +90
degrees)
–30.0 –30.0 0.1
PLAR Reverse Load Positive Angle (+90 to +270
degrees)
150.0 150.0 0.1
NLAR Reverse Load Negative Angle (+90 to +270
degrees)
210.0 210.0 0.1
Table 8.47 Out-of-Step Tripping/Blocking (Sheet 2 of 2)
Setting Prompt
Default Value
Increment
5 A 1 A