Schweitzer Engineering Laboratories, Inc. SEL-487E-3, -4 Data Sheet
29
Event Reports
Length: 0.25–24 seconds (based on LER and
SRATE settings)
Volatile Memory: 3 s of back-to-back event reports sampled
at 8 kHz
Nonvolatile Memory: At least 4 event reports of a 3 s duration
sampled at 8 kHz
Resolution: 4 and 8 samples/cycle
Event Summary
Storage: 100 summaries
Breaker History
Storage: 128 histories
Sequential Events Recorder
Storage: 1000 entries
Trigger Elements: 250 relay elements
Resolution: 0.5 ms for contact inputs
Resolution: 1/8 cycle for all elements
Processing Specifications
AC Voltage and Current Inputs
8000 samples per second, 3 dB low-pass analog filter cut-off frequency at
2.8 kHz, ±5%
Digital filtering
Full-cycle cosine after low-pass analog filtering
Protection and Control Processing
8 times per power system cycle
Control Points
64 remote bits
96 local control bits
32 latch bits in protection logic
64 latch bits in automation logic
Relay Element Pickup Ranges and Accuracies
Differential Elements (General)
Number of Zones: 2 (A, B, and C elements)
Number of Windings: 6
TAP Pickup: (0.1–32.0) • I
NOM
A secondary
TAP Range: TAP
MAX
/TAP
MIN
35
Time-Delay Accuracy: ±0.1% plus ±0.125 cycle
Differential Elements (Restraint)
Pickup Range: 0.1–4.0 per unit
Pickup Accuracy: 1 A nominal: ±5% ±0.02 A
5 A nominal: ±5% ±0.10 A
Pickup Time
(If E87UNB = N):
1.25 minimum cycle
1.38 typical cycle
1.5 maximum cycle
Pickup Time
(If E87UNB = Y):
0.5 minimum cycle
0.75 typical cycle
1.5 maximum cycle
Slope 1
Setting Range: 5%–100%
Slope 2
Setting Range: 5%–100%
Differential Elements (Unrestraint)
Pickup Range: (1.0–20.0) • TAP
Pickup Accuracy: ±5% of user setting, ±0.02 • I
NOM
A
Pickup Time
(Filtered Unrestraint):
0.7 minimum cycle
0.85 typical cycle
1.2 maximum cycle
Pickup Time
(Raw Unrestraint):
0.25 minimum cycle
0.5 typical cycle
1.0 maximum cycle
Note: The raw unrestraint pickup is set to U87P • 2 • 2
Harmonic Elements (2nd, 4th, 5th)
Pickup Range: OFF, 5–100% of fundamental
Pickup Accuracy: 1 A nominal ±5% ±0.02 A
5 A nominal ±5% ±0.10 A
Time-Delay Accuracy: ±0.1% plus ±0.125 cycle (differential
element)
±0.1% plus ±0.25 cycle (distance element)
Negative-Sequence Differential Element
Pickup Range: 0.05–1 per unit
Slope Range: 5–100%
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.)
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