Sel SEL-421 - Series Compensation; Mho Phase Distance Element Time Delay; Mho Ground Distance Element Reach

R.10.17
Date Code 20111215 Reference Manual SEL-421 Relay
Settings
Group Settings
Make Table 10.33 settings when Group setting ESERCMP := Y.
NOTE: The SEL-421-1 and the
SEL-421-2 do not provide series-
compensated line protection logic.
This setting is unavailable in the
SEL-421-1 and the SEL-421-2.
Make corresponding zone n = 1–5 settings in Table 10.34 for any ZnP settings
that are made in Table 10.32. When E21P := N, no settings are made for
Table 10.34.
The number of pickup settings in Table 10.35 is dependent on Group setting
E21MG := 1–5. When E21MG := N, no settings are made for Table 10.35.
Z4P Zone 4 Reach
(OFF, 0.05–64  secondary) 5 A
(OFF, 0.25–320  secondary) 1 A
OFF OFF
Z5P Zone 5 Reach
(OFF, 0.05–64  secondary) 5 A
(OFF, 0.25–320  secondary) 1 A
OFF OFF
Table 10.32 Mho Phase Distance Element Reach (Sheet 2 of 2)
Default Value
Label Prompt 5 A 1 A
Tabl e 1 0 .33 Se r ies Co m pe n sat i on
Default Value
Label Prompt 5 A 1 A
XC Series Capacitor Reactance
(OFF, 0.05–64  secondary) 5 A
(OFF, 0.25–320  secondary) 1 A
OFF OFF
Table 10.34 Mho Phase Distance Element Time Delay
Label Prompt Default Value
Z1PD Zone 1 Time Delay (OFF, 0.000–16000 cycles) 0.000
Z2PD Zone 2 Time Delay (OFF, 0.000–16000 cycles) 20.000
Z3PD Zone 3 Time Delay (OFF, 0.000–16000 cycles) 60.000
Z4PD Zone 4 Time Delay (OFF, 0.000–16000 cycles) OFF
Z5PD Zone 5 Time Delay (OFF, 0.000–16000 cycles) OFF
Table 10.35 Mho Ground Distance Element Reach (Sheet 1 of 2)
Default Value
Label Prompt 5 A 1 A
Z1MG Zone 1
(OFF, 0.05–64  secondary) 5 A
(OFF, 0.25–320  secondary) 1 A
6.24 31.2
Z2MG Zone 2
(OFF, 0.05–64  secondary) 5 A
(OFF, 0.25–320  secondary) 1 A
9.36 46.8
Z3MG Zone 3
(OFF, 0.05–64  secondary) 5 A
(OFF, 0.25–320  secondary) 1 A
1.87 9.35