Sel SEL-421 - Residual Ground Definite-Time Overcurrent Time Delay; Negative-Sequence Instantaneous Overcurrent Pickup

R.10.23
Date Code 20111215 Reference Manual SEL-421 Relay
Settings
Group Settings
Make corresponding zone n = 1–4 settings in Table 10.47 and Table 10.48 for
any 50GnP settings that are made in Table 10.46.
The number of pickup settings in Table 10.49 is dependent on Group setting
E50Q := 1–4. When E50Q := N, no settings are made for Table 10.49 through
Table 10.51.
50G3P Level 3 Pickup
(OFF, 0.25–100 A secondary) 5 A
(OFF, 0.05–20 A secondary) 1 A
OFF OFF
50G4P Level 4 Pickup
(OFF, 0.25–100 A secondary) 5 A
(OFF, 0.05–20 A secondary) 1 A
OFF OFF
Table 10.47 Residual Ground Definite-Time Overcurrent Time Delay
Label Prompt Default Value
67G1D Level 1 Time Delay (0.000–16000 cycles) 0.000
67G2D Level 2 Time Delay (0.000–16000 cycles) 0.000
67G3D Level 3 Time Delay (0.000–16000 cycles) 0.000
67G4D Level 4 Time Delay (0.000–16000 cycles) 0.000
Table 10.48 Residual Ground Instantaneous Definite-Time Overcurrent
Torque Control
a
a
These settings cannot be set to NA or to logical 0.
Label Prompt Default Value
67G1TC Level 1 Torque Control (SELOGIC Equation) 1
67G2TC Level 2 Torque Control (SEL
OGIC Equation) 1
67G3TC Level 3 Torque Control (SEL
OGIC Equation) 1
67G4TC Level 4 Torque Control (SEL
OGIC Equation) 1
Table 10.49 Negative-Sequence Instantaneous Overcurrent Pickup
Default Value
Label Prompt 5 A 1 A
50Q1P Level 1 Pickup
(OFF, 0.25–100 A secondary) 5 A
(OFF, 0.05–20 A secondary) 1 A
OFF OFF
50Q2P Level 2 Pickup
(OFF, 0.25–100 A secondary) 5 A
(OFF, 0.05–20 A secondary) 1 A
OFF OFF
50Q3P Level 3 Pickup
(OFF, 0.25–100 A secondary) 5 A
(OFF, 0.05–20 A secondary) 1 A
OFF OFF
50Q4P Level 4 Pickup
(OFF, 0.25–100 A secondary) 5 A
(OFF, 0.05–20 A secondary) 1 A
OFF OFF
Table 10.46 Residual Ground Instantaneous Overcurrent Pickup
(Sheet 2 of 2)
Default Value
Label Prompt 5 A 1 A