1.10
SEL-387-0, -5, -6 Relay Instruction Manual Date Code 20170601
Specifications
Restrained Element (with
harmonic blocking)
Pickup Time:
1.5/1.6/2.2 cycles
(Min/Typ/Max)
Restrained Element (with
harmonic restraint)
Pickup Time:
2.62/2.72/2.86 cycles
(Min/Typ/Max)
Harmonic Element
Pickup Range
(% of fundamental): 5–100%
Pickup Accuracy (A secondary)
5 A Model: ±5% ±0.10 A
1 A Model: ±5% ±0.02 A
Time Delay Accuracy: ±0.1% ±0.25 cycle
Winding Instantaneous/Definite-Time Overcurrent Elements
Pickup Ranges (A secondary)
5 A Model: 0.25–100.00 A
1 A Model: 0.05–20.00 A
Pickup Accuracies (A secondary)
5 A Model:
Steady State: ±3% ±0.10 A
Transient: ±5% ±0.10 A
1 A Model:
Steady State: ±3% ±0.02 A
Transient: ±5% ±0.02 A
Note: For transient, ±6% for negative-sequence elements.
Pickup Time: 0.75/1.20 cycles
(Typ/Max)
Time Delay Range: 0–16000 cycles
Time Delay Accuracy: ±0.1% ±0.25 cycle
Winding and Combined Current Time Overcurrent Elements
Pickup Ranges (A secondary)
5 A Model: 0.5–16.0 A
1 A Model: 0.1–3.2 A
Pickup Accuracies (A secondary)
5 A Model:
Steady State: ±3% ±0.10 A
Transient: ±5% ±0.10 A
1 A Model:
Steady State: ±3% ±0.02 A
Transient: ±5% ±0.02 A
Note: For transient, ±6% for negative-sequence elements.
Curve
U1 = U.S. Moderately Inverse
U2 = U.S. Inverse
U3 = U.S. Very Inverse
U4 = U.S. Extremely Inverse
U5 = U.S. Short-Time Inverse
C1 = IEC Class A (Standard Inverse)
C2 = IEC Class B (Very Inverse)
C3 = IEC Class C (Extremely Inverse)
C4 = IEC Long-Time Inverse
C5 = IEC Short-Time Inverse
Time-Dial Range
US Curves: 0.50–15.00
IEC Curves: 0.05–1.00
Timing Accuracy: ±4% ±1.5 cycles for current between
2 and 30 multiples of pickup
Note: For the combined current elements, 30 multiples of pickup is
the sum of the currents in the two windings.
Reset Characteristic: Induction-disk reset emulation or
1 cycle linear reset
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