Sel SEL-421 - Negative-Sequence Definite-Time Overcurrent Time Delay

R.10.24
SEL-421 Relay Reference Manual Date Code 20111215
Settings
Group Settings
Make corresponding zone n = 1–4 settings in Table 10.50 and Table 10.51 for
any 50QnP settings that are made in Table 10.49.
Make Table 10.52 settings if Group setting E51S := 1–3.
Table 10.50 Negative-Sequence Definite-Time Overcurrent Time Delay
Label Prompt Default Value
67Q1D Level 1 Time Delay (0.000–16000 cycles) 0.000
67Q2D Level 2 Time Delay (0.000–16000 cycles) 0.000
67Q3D Level 3 Time Delay (0.000–16000 cycles) 0.000
67Q4D Level 4 Time Delay (0.000–16000 cycles) 0.000
Table 10.51 Negative-Sequence Instantaneous Definite-Time Overcurrent
Torque Control
a
a
These settings cannot be set to NA or to logical 0.
Label Prompt Default Value
67Q1TC Level 1 Torque Control (SELOGIC Equation) 1
67Q2TC Level 2 Torque Control (SEL
OGIC Equation) 1
67Q3TC Level 3 Torque Control (SEL
OGIC Equation) 1
67Q4TC Level 4 Torque Control (SEL
OGIC Equation) 1
Table 10.52 Selectable Operating Quantity Inverse Time Overcurrent
Element 1
Default Value
Label Prompt 5 A 1 A
51S1O 51S1 Operating Quantity (IAn, IBn, ICn, IMAXn,
I1L, 3I2L, 3I0n)
a
a
Parameter n = L for line, 1 for BK1, and 2 for BK2.
3I0L 3I0L
51S1P 51S1 Overcurrent Pickup
(0.25–16 A secondary) 5 A
(0.05–3.2 A secondary) 1 A
0.75 0.15
51S1C 51S1 Inverse Time Overcurrent Curve
(U1–U5) US
(C1–C5) IEC
U3 U3
51S1TD 51S1 Inverse Time Overcurrent Time Dial
(0.50–15.00) US
(0.05–1.00) IEC
1.0 1.0
51S1RS 51S1 Inverse Time Overcurrent Electromagnetic
Reset (Y, N)
NN
51S1TC
b
b
This setting cannot be set to NA or to logical 0.
51S1 Torque Control (SELOGIC Equation) 32GF 32GF