SEL-487E Data Sheet Schweitzer Engineering Laboratories, Inc.
30
Negative-Sequence Differential Element
Pickup Range: 0.05–1 per unit
Slope Range: 5% to 100%
Pickup Accuracy: ±5% of user setting, ±0.02 • I
NOM
A
Maximum Pickup/Dropout
Time: 4 cycles
Winding Coverage: 2%
Incremental Restraint and Operating Threshold Current Supervision
Setting Range: 0.1–10.0 per unit
Accuracy: ±5% ±0.02 • I
NOM
Open-Phase Detection Logic
3 elements per winding (S, T, U, W, X, Y)
Pickup Range
1 A Nominal: 0.04–1.00 A
5 A Nominal: 0.2–5.00 A
Maximum Pickup/Dropout
Time: 0.625 cycle
Restricted Earth Fault (REF)
Elements
Three Independent
Elements: REF1, REF2, REF3
REF1F, REF1R (Element 1, forward and reverse)
REF2F, REF2R (Element 2, forward and reverse)
REF3F, REF3R (Element 3, forward and reverse)
Operating Quantity
Select: IY1, IY2, IY3
Restraint Quantity
Select: 3I0S, 3I0T, 3I0U, 3I0W, and 3I0X
Pickup Range: 0.05–5 per unit
0.02–0.05 positive-sequence ratio factor
(I0/I1)
Pickup Accuracy
1 A Nominal: 0.01 A
5 A Nominal: 0.05 A
Maximum Pickup/Dropout
Time: 2.75 cycles
Mho Phase Distance Elements
Zones 1—4 Impedance Reach
Setting Range
5 A Model: OFF, 0.05 to 64 secondary, 0.01 steps
1 A Model: OFF, 0.25 to 320 secondary, 0.01 steps
Sensitivity
5 A Model: 0.5 A
P-P
secondary
1 A Model: 0.1 A
P-P
secondary
(Minimum sensitivity is controlled by the
pickup of the supervising phase-to-phase
overcurrent elements for each zone.)
Accuracy (Steady State): ± 3% of setting at line angle for SIR
(source-to-line impedance ratio) < 30
± 5% of setting at line angle for
30 SIR 60
Zone 1 Transient Overreach: < 5% of setting plus steady-state accuracy
Maximum Operating Time: 1.75 cycles at 90% of reach and SIR = 1
Quadrilateral Phase Distance Elements
Zones 1—4 Impedance Reach
Quadrilateral Reactance Reach
5 A Model: OFF, 0.05 to 64 secondary, 0.01 steps
1 A Model: OFF, 0.25 to 320 secondary, 0.01 steps
Quadrilateral Resistance Reach
Zones 1, 2, and 3
5 A Model: OFF, 0.05 to 50 secondary, 0.01 steps
1 A Model: OFF, 0.25 to 250 secondary, 0.01 steps
Zones 4
5 A Model: OFF, 0.05 to 150 secondary, 0.01 steps
1 A Model: OFF, 0.25 to 750 secondary, 0.01 steps
Sensitivity
5 A Model: 0.5 A secondary
1 A Model: 0.1 A secondary
Accuracy (Steady State): ±3% of setting at line angle for SIR < 30
±5% of setting at line angle for
30 SIR 60
Transient Overreach: <5% of setting plus steady-state accuracy
Maximum Operating Time: 1.75 cycles at 90% of reach and SIR = 1
Mho Ground Distance Elements
Zones 1—4 Impedance Reach
Mho Element Reach
5 A Model: OFF, 0.05 to 64 secondary, 0.01 steps
1 A Model: OFF, 0.25 to 320 secondary, 0.01 steps
Sensitivity
5 A Model: 0.5 A secondary
1 A Model: 0.1 A secondary
(Minimum sensitivity is controlled by the
pickup of the supervising phase and residual
overcurrent elements for each zone.)
Accuracy (Steady State): ±3% of setting at line angle for SIR < 30
±5% of setting at line angle for
30 SIR 60
Zone 1 Transient Overreach: <5% of setting plus steady-state accuracy
Maximum Operating Time: 1.75 cycles at 90% of reach and SIR = 1
Quadrilateral Ground Distance Elements
Zones 1—4 Impedance Reach
Quadrilateral Reactance Reach
5 A Model: OFF, 0.05 to 64 secondary, 0.01 steps
1 A Model: OFF, 0.25 to 320 secondary, 0.01 steps
Quadrilateral Resistance Reach
Zones 1, 2, and 3
5 A Model: OFF, 0.05 to 50 secondary, 0.01 steps
1 A Model: OFF, 0.25 to 250 secondary, 0.01 steps
Zones 4
5 A Model: OFF, 0.05 to 150 secondary, 0.01 steps
1 A Model: OFF, 0.25 to 750 secondary, 0.01 steps
Sensitivity
5 A Model: 0.5 A secondary
1 A Model: 0.1 A secondary
(Minimum sensitivity is controlled by the
pickup of the supervising phase and residual
overcurrent elements for each zone.)
Accuracy (Steady State): ±3% of setting at line angle for SIR < 30
±5% of setting at line angle for
30 SIR 60
Transient Overreach: <5% of setting plus steady-state accuracy
Maximum Operating Time: 1.75 cycles at 90% of reach and SIR = 1
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