8.26
SEL-421 Relay Instruction Manual Date Code 20171021
Settings
Group Settings
Make Table 8.64 settings if any of the Group settings E21P, E21G, E21XG, E50P,
E50G or E50Q := 3, 4, or 5.
Table 8.64 Zone/Level Direction
Setting Prompt Default Value
DIR3 Zone/Level 3 Directional Control (F, R) R
DIR4 Zone/Level 4 Directional Control (F, R) F
DIR5 Zone/Level 5 Directional Control (F, R) F
Table 8.65 Directional Control Element
Setting Prompt
Default Value
Increment
5 A 1 A
ORDER Ground Directional Element Priority
(combine Q, V, I)
QV QV
50FP
a
a
Setting only available when Group setting E32 := Y. Setting automatically calculated when
E32 := AUTO or AUTO2.
Forward Directional Overcurrent Pickup
(0.25–5 A secondary) 5 A
(0.05–1 A secondary) 1 A
0.50 0.10 0.01
50RP
a
Reverse Directional Overcurrent Pickup
(0.25–5 A secondary) 5 A
(0.05–1 A secondary) 1 A
0.25 0.05 0.01
Z2F
a
Forward Directional Z2 Threshold
(–64.00 to +64.00 secondary) 5 A
(–320.00 to +320.00 secondary) 1 A
–0.30 –1.50 0.01
Z2R
a
Reverse Directional Z2 Threshold
(–64.00 to +64.00 secondary) 5 A
(–320.00 to +320.00 secondary) 1 A
0.30 1.50 0.01
a2
a
Positive-Sequence Restraint Factor, I2/I1
(0.02–0.50)
0.10 0.10 0.01
k2
a
Zero-Sequence Restraint Factor, I2/I0 (0.10–1.20) 0.20 0.20 0.01
Z0F
a
Forward Directional Z0 Threshold
(–64.00 to +64.00 secondary) 5 A
(–320.00 to +320.00 secondary) 1 A
–0.30 –1.50 0.01
Z0R
a
Reverse Directional Z0 Threshold
(–64.00 to +64.00 secondary) 5 A
(–320.00 to +320.00 secondary) 1 A
0.30 1.50 0.01
a0
a
Positive-Sequence Restraint Factor, I0/I1 (0.02–0.5) 0.10 0.10 0.01
E32IV Zero-Sequence Voltage and Current Enable
(SEL
OGIC Equation)
11
Table 8.66 Pole-Open Detection
Setting Prompt Default Value Increment
EPO Pole Open Detection (52, V) 52
27PO Undervoltage Pole Open Threshold (1–200 V) 40 1
SPOD Single Pole Open Dropout Delay (0.000–60 cycles) 0.500 0.125
3POD Three Pole Open Dropout Delay (0.000–60 cycles) 0.500 0.125
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