Sel SEL-421 - Page 543

R.10.25
Date Code 20111215 Reference Manual SEL-421 Relay
Settings
Group Settings
Make Table 10.53 settings if Group setting E51S := 2 or 3.
Make Table 10.54 settings if Group setting E51S := 3.
Table 10.53 Selectable Operating Quantity Inverse Time Overcurrent
Element 2
Default Value
Label Prompt 5 A 1 A
51S2O 51S2 Operating Quantity
(IAn, IBn, ICn, IMAXn, I1L, 3I2L, 3I0n)
a
a
Parameter n = L for line, 1 for BK1, 2 for BK2.
3I2L 3I2L
51S2P 51S2 Overcurrent Pickup
(0.25–16 A secondary) 5 A
(0.05–3.2 A secondary) 1 A
5.00 1.00
51S2C 51S2 Inverse Time Overcurrent Curve
(U1–U5) US
(C1–C5) IEC
U3 U3
51S2TD 51S2 Inverse Time Overcurrent Time Dial
(0.50–15.00)
(0.05–1.00) IEC
1.0 1.0
51S2RS 51S2 Inverse Time Overcurrent Electromagnetic
Reset (Y, N)
NN
51S2TC
b
b
This setting cannot be set to NA or to logical 0.
51S2 Torque Control (SELOGIC Equation) 32QF 32QF
Table 10.54 Selectable Operating Quantity Inverse Time Overcurrent
Element 3
Default Value
Label Prompt 5 A 1 A
51S3O 51S3 Operating Quantity
(IAn, IBn, ICn, IMAXn, I1L, 3I2L, 3I0n)
a
a
Parameter n = L for line, 1 for BK1, 2 for BK2.
IMAXL IMAXL
51S3P 51S3 Overcurrent Pickup
(0.25–16 A secondary) 5 A
(0.05–3.2 A secondary) 1 A
5.00 1.00
51S3C 51S3 Inverse Time Overcurrent Curve
(U1–U5) US
(C1–C5) IEC
U3 U3
51S3TD 51S3 Inverse Time Overcurrent Time Dial
(0.50–15.00) US
(0.05–1.00) IEC
1.0 1.0
51S3RS 51S3 Inverse Time Overcurrent Electromagnetic
Reset (Y, N)
NN
51S3TC
b
b
This setting cannot be set to NA or to logical 0.
51S3 Torque Control (SELOGIC Equation) M2P M2P