Date Code 20020129
Introduction and Specifications
1-9
SEL-387E Instruction Manual
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
Timing Accuracy:
±4% ±1.5 cycles for current between 2 and 30 multiples of pickup. Curves
operate on definite time for current greater than 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
Over-/Undervoltage Elements
Pickup
Range:
0.00–300.00 V, 0.01 V steps
Steady-State Pickup
Accuracy:
±5% ±2 V
Transient Overreach:
±5% of pickup
Frequency Element
Pickup Range:
40.10–65.00 Hz, 0.01 Hz steps
Steady-State plus
Transient Overshoot: ±0.01 Hz
Time Delay:
0.04–300.00 s, 0.01 s steps
Timer Accuracy:
±0.1% ±0.0042 s
Frequency change
caused by temperature:
D
f
sys
= f
sys
• (0.04 • 10
-6
) (T–25°C)
2
where T = temperature of relay via
STATUS
command
