Schweitzer Engineering Laboratories, Inc. SEL-487E-3, -4 Data Sheet
31
Adaptive Time-Overcurrent Elements (51)
Pickup Range (Adaptive Within the Range)
5 A Nominal: 0.25–16.00 A secondary, 0.01 A steps
1 A Nominal: 0.05–3.20 A secondary, 0.01 A steps
Accuracy (Steady State)
5 A Nominal: ±0.05 A plus ±3% of setting
1 A Nominal: ±0.01 A plus ±3% of setting
Transient Overreach
5 A Nominal: ±5% of setting, ±0.10 A
1 A Nominal: ±5% of setting, ±0.10 A
Time Dial Range (Adaptive Within the Range)
U.S.: 0.50–15.00, 0.01 steps
IEC: 0.05–1.00, 0.01 steps
Curve Timing Accuracy: ±1.50 cycles plus ±4% of curve time (for
current between 2 and 30 multiples of
pickup)
Curves operate on definite time for current greater than 30 multiples of
pickup.
Reset: 1 power cycle or Electromechanical
Reset Emulation time
Combined Time-Overcurrent Elements (51)
Pickup Range
5 A Nominal: 0.25–16.00 A secondary, 0.01 A steps
1 A Nominal: 0.05–3.20 A secondary, 0.01 A steps
Accuracy (Steady State)
5 A Nominal: ±0.05 A plus ±3% of setting
1 A Nominal: ±0.01 A plus ±3% of setting
Transient Overreach
5 A Nominal: ±5% of setting, ±0.10 A
1 A Nominal: ±5% of setting, ±0.20 A
Time Dial Range
U.S.: 0.50–15.00, 0.01 steps
IEC: 0.05–1.00, 0.01 steps
Curve Timing Accuracy: ±1.50 cycles plus ±4% of curve time (for
current between 2 and 30 multiples of
pickup)
Curves operate on definite time for current greater than 30 multiples of
pickup.
Reset: 1 power cycle or electromechanical
reset emulation time
Phase Directional Elements (67)
Number: 6 (1 each for S, T, U, W, X, Y)
Polarization: Positive-sequence memory voltage
Negative-sequence voltage
Time-Delay Range: 0.000–16,000 cycles, 0.125 cycle
increment
Time-Delay Accuracy: ±0.1% of setting ±0.25 cycle
Phase-to-Phase Directional Elements
Number: 6 (1 each for S, T, U, W, X, Y)
Polarization Quantity: Negative-sequence voltage
Operate Quantity: Negative-sequence current (3I
2
)
Sensitivity: 0.05 • I
NOM
A of secondary 3I
2
Accuracy: ±0.05 secondary
Transient Overreach: +5% of set reach
Max. Delay: 1.75 cycles
Time-Delay Range: 0.000–16,000 cycles, 0.125-cycle
increment
Time-Delay Accuracy: ±0.1% of setting ±0.25 cycle
Ground Directional Elements
Number: 6 (1 each for S, T, U, W, X, Y)
Outputs: Forward and Reverse
Polarization Quantity: Zero-sequence voltage
Operate Quantity: Zero-sequence current 3I0,
where 3I0 = IA + IB + IC
Sensitivity: 0.05 • I
NOM
of secondary 3I0
Accuracy: ±0.05 secondary
Transient Overreach: +5% of set reach
Max. Delay: 1.75 cycles
Undervoltage and Overvoltage Elements
Pickup Ranges
300 V Maximum Inputs
Phase Elements: 2–300 V
LN
in 0.01-V steps
Phase-to-Phase Elements: 4–520 V
LL
in 0.01-V steps
Sequence Elements: 2–300 V
LN
in 0.01-V steps
8 V LEA Maximum Inputs (see Potential Transformer (PT) Ratio
Settings With LEA Inputs on page 2 for information on setting voltage
elements when using LEA inputs.)
Phase Elements: 0.05–8.00 V
Phase-to-Phase Elements: 0.10–13.87 V
Sequence Elements: 0.05–8.00 V
Pickup Accuracy (Steady State)
Phase Elements: ±3% of setting, ±0.5 V
Phase-to-Phase Elements
(Wye): ±3% of setting, ±0.5 V
Phase-to-Phase Elements
(Delta): ±3% of setting, ±1 V
Sequence Elements: ±5% of setting, ±1 V
Pickup Accuracy (Transient Overreach)
Phase Elements: ±5%
Phase-to-Phase Elements
(Wye): ±5%
Phase-to-Phase Elements
(Delta): ±5%
Sequence Elements: ±5%
Maximum Pickup/Dropout Time
Phase Elements: 1.5 cycles
Phase-to-Phase Elements
(Wye): 1.5 cycles
Sequence Elements: 1.5 cycles
Under- and Overfrequency Elements
Pickup Range: 40.01–69.99 Hz, 0.01-Hz steps
Accuracy, Steady State Plus
Transient:
±0.005 Hz for frequencies between 40.00
and 70.00 Hz
Maximum Pickup/Dropout
Time: 3.0 cycles
Time-Delay Range: 0.04–300.00 s, 0.001-s increment
Time-Delay Accuracy: ±0.1% ±0.0042 s
Pickup Range, Undervoltage
Blocking:
20.00–200.00 V
LN
(Wye) or V
LL
(Open-
Delta)
Pickup Accuracy,
Undervoltage Blocking: ±2% ±0.5 V
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