1-8 Introduction and Specifications Date Code 20080110
SEL-387E Instruction Manual
Object Penetration: IEC 60529 [IEC 529]:1989, IP30
Protection Against
Dust and Splashing Water: IEC 60529 [IEC 529]:1989, IP54 from the front panel using
the optional SEL-9103
Surge Withstand Capability: IEEE C37.90.1-1989, 3000 V oscillatory, 5000 V fast transient
Note: * = Terminal Block version only.
Certifications: ISO: Relay is designed and manufactured using ISO-9001 certified quality program.
UL Listed
CSA Certified
Sampling: 64 samples per power system cycle
Processing: Differential elements, optoisolated inputs, and contact outputs are processed at 1/8-cycle.
Overcurrent elements are processed at 1/8-cycle.
Metering Accuracy
Accuracy Range:
5 A Model
Phase Currents: ±1.5% ±0.10 A and ±1.5°
Sequence Currents: ±3.0% ±0.10 A and ±2.0°
Differential Quantities: ±5.0% ±0.10 A
2nd and 5th Harmonic: ±5.0% ±0.10 A
Current Harmonics: ±5.0% ±0.10 A
1 A Model
Phase Currents: ±1.5% ±0.02 A and ±1.5°
Sequence Currents: ±3.0% ±0.02 A and ±2.0°
Differential Quantities: ±5.0% ±0.02 A
2nd and 5th Harmonic: ±5.0% ±0.02 A
Current Harmonics: ±5.0% ±0.02 A
Phase Voltages: ±1.5% ±0.10 V and ±1.5°
Sequence Voltages: ±3.0% ±0.10 V and ±2.0°
Power Quantities: ±3.0% and ±3.0° for balanced currents and voltages
Station DC Battery Monitor
Pickup Range: 20–300 Vdc, 1 Vdc steps
Pickup Accuracy: ±2.0% ±2 Vdc
Differential Element
Unrestrained
Pickup Range: 1–20 in per unit of tap
Restrained
Pickup Range: 0.1–1.0 in per unit of tap
Pickup Accuracy (A secondary)
5 A Model: ±5% ±0.10 A
1 A Model: ±5% ±0.02 A
Unrestrained Element Pickup Time
(Min/Typ/Max): 0.8/1.0/1.9 cycles
Restrained Element (with harmonic blocking)
Pickup Time
(Min/Typ/Max): 1.5/1.6/2.2 cycles
Restrained Element (with harmonic restraint)
Pickup Time
(Min/Typ/Max): 2.62/2.72/2.86 cycles
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