Date Code 20080110 Introduction and Specifications 1-9
SEL-387E Instruction Manual
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
Instantaneous/Definite-Time Overcurrent Elements (Winding)
Pickup Range (A secondary)
5 A Model: 0.25–100.00 A
1 A Model: 0.05–20.00 A
Pickup Accuracy (A secondary)
5 A Model
Steady State: ±3% ±0.10 A
Transient: ±5% ±0.10 A
Transient for 50Q: ±6% ±0.10 A
1 A Model:
Steady State: ±3% ±0.02 A
Transient: ±5% ±0.02 A
Transient for 50Q: ±6% ±0.02 A
Pickup Time
(Typ/Max): 0.75/1.20 cycles
Time Delay Range: 0–16000 cycles
Time Delay Accuracy: ±0.1% ±0.25 cycle
Time Overcurrent Elements (Winding and Combined Current)
Pickup Range (A secondary)
5 A Model: 0.50–16.00 A
1 A Model: 0.10–3.20 A
Pickup Accuracy (A secondary)
5 A Model
Steady State: ±3% ±0.10 A
Transient: ±5% ±0.10 A
Transient for 50Q: ±6% ±0.10 A
1 A Model
Steady State: ±3% ±0.02 A
Transient: ±5% ±0.02 A
Transient for 50Q: ±6% ±0.02 A
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
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