1-10 Introduction and Specifications Date Code 20080110
SEL-387E Instruction Manual
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: Δf
sys
= f
sys
• (0.04 • 10
-6
) (T–25°C)
2
where T = temperature of relay via STATUS command
Volts/Hertz Element
Definite-Time Element
Pickup Range: 100–200%
Steady-State
Pickup Accuracy: ±1% of setpoint
Pickup Time: 25 ms @ 60 Hz (Max)
Time-Delay Range: 0.00–400.00 s
Time-Delay Accuracy: ±0.1% ±4.2 ms @ 60 Hz
Reset Time Range: 0.00–400.00 s
Inverse-Time Element
Pickup Range: 100–200%
Steady-State
Pickup Accuracy: ±1% of setpoint
Pickup Time: 25 ms @ 60 Hz (Max)
Curve: 0.5, 1.0, or 2.0
Factor: 0.1–10.0 s
Timing Accuracy: ±4% ±25 ms @ 60 Hz, for V/Hz above 1.05 multiples (Curve 0.5 and 1.0) or
1.10 multiples (Curve 2.0) of pickup setting, and for operating times greater
than 4 s
Reset Time Range: 0.00–400.00 s
Composite-Time Element:
Combination of Definite-Time and Inverse-Time specifications
User-Definable Curve Element
Pickup Range: 100–200%
Steady-State
Pickup Accuracy: ±1% of setpoint
Pickup Time: 25 ms @ 60 Hz (Max)
Reset Time Range: 0.00–400.00 s
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