Schweitzer Engineering Laboratories SEL-421-4, Instruction Manual

Page: 558 / 1518

8.22
SEL-421 Relay Instruction Manual Date Code 20171021
Settings
Group Settings
The number of pickup settings in Table 8.52 is dependent on Group setting
E50G := 1–4. When E50G := N, no settings are made for Table 8.52 through
Table 8.54 .
Make corresponding zone n = 1–4 settings in Table 8.53 and Table 8.54 for any
50G n P settings that are made in Table 8.52 .
NOTE:
If the relay is using a remote
data acquisition system, such as TiDL,
the operating times will be delayed by
1.5 ms. Use caution when setting the
relay coordination times to account
for this added delay.
The number of pickup settings in Table 8.55 is dependent on Group setting
E50Q := 1–4. When E50Q := N, no settings are made for Table 8.55 through
Table 8.57 .
Table 8.52 Residual Ground Instantaneous Overcurrent Pickup
Setting Prompt
Default Value
Increment
5 A 1 A
50G1P Level 1 Pickup
(OFF, 0.25–100 A secondary) 5 A
(OFF, 0.05–20 A secondary) 1 A
OFF OFF 0.01
50G2P Level 2 Pickup
(OFF, 0.25–100 A secondary) 5 A
(OFF, 0.05–20 A secondary) 1 A
OFF OFF 0.01
50G3P Level 3 Pickup
(OFF, 0.25–100 A secondary) 5 A
(OFF, 0.05–20 A secondary) 1 A
OFF OFF 0.01
50G4P Level 4 Pickup
(OFF, 0.25–100 A secondary) 5 A
(OFF, 0.05–20 A secondary) 1 A
OFF OFF 0.01
Table 8.53 Residual Ground Definite-Time Overcurrent Time Delay
Setting Prompt Default Value Increment
67G1D Level 1 Time Delay (0.000–16000 cycles) 0.000 0.125
67G2D Level 2 Time Delay (0.000–16000 cycles) 0.000 0.125
67G3D Level 3 Time Delay (0.000–16000 cycles) 0.000 0.125
67G4D Level 4 Time Delay (0.000–16000 cycles) 0.000 0.125
Table 8.54 Residual Ground Instantaneous Definite-Time Overcurrent Torque
Control
a
a
These settings cannot be set to NA or to logical 0.
Setting Prompt Default Value
67G1TC Level 1 Torque Control (SEL
OGIC
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