Sel SEL-421 - Load Encroachment

R.10.21
Date Code 20111215 Reference Manual SEL-421 Relay
Settings
Group Settings
Make Table 10.42 settings when Group setting ELOAD := Y.
The number of pickup settings in Table 10.43 is dependent on Group setting
E50P := 1–4. When E50P := N, no settings are made for Table 10.43 through
Table 10.45.
R1L7
a
Zone 7 Resistance—Left
(–0.05 to–70  secondary) 5 A
(–0.25 to–350  secondary) 1 A
–23.0 –115
R1L6
a
Zone 6 Resistance—Left
(–0.05 to–70  secondary) 5 A
(–0.25 to–350  secondary) 1 A
–21.0 –105
50ABCP
a
Positive-Sequence Current Supervision
(1.00–100 A secondary) 5 A
(0.20–20 A secondary) 1 A
10.2
50QUBP
a
Negative-Sequence Current Supervision
(OFF, 0.50–100 A secondary) 5 A
(OFF, 0.10–20 A secondary) 1 A
OFF OFF
UBD
a
Negative-Sequence Current Unblock Delay
(0.500–120 cycles)
0.500 0.500
UBOSBF
a
Out-of-Step Angle Unblock Rate (1–10) 4 4
a
Make setting only when Group setting EADVS := Y.
Table 10.42 Load Encroachment
Default Value
Label Prompt 5 A 1 A
ZLF Forward Load Impedance
(0.05–64  secondary) 5 A
(0.25–320  secondary) 1 A
9.22 46.1
ZLR Reverse Load Impedance
(0.05–64  secondary) 5 A
(0.25–320  secondary) 1 A
9.22 46.1
PLAF Forward Load Positive Angle
(–90 to +90 degrees)
30.0 30.0
NLAF Forward Load Negative Angle
(–90 to +90 degrees)
–30.0 –30.0
PLAR Reverse Load Positive Angle
(+90 to +270 degrees)
150.0 150.0
NLAR Reverse Load Negative Angle
(+90 to +270 degrees)
210.0 210.0
Table 10.41 Out-of-Step Tripping/Blocking (Sheet 2 of 2)
Default Value
Label Prompt 5 A 1 A