1.11
Date Code 20081022 Instruction Manual SEL-787 Relay
Introduction and Specifications
Specifications
Differential (87)
Unrestrained Pickup
Range: 1.0–20.0 in per unit of TAP
Restrained Pickup Range: 0.10–1.00 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: 0.8/1.0/1.9 cycles (Min/Typ/Max)
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)
Harmonics
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: ±0.5% ±0.25 cycle
Restricted Earth Fault (REF)
5 A Model: 0.25–15.00 A, 0.01 A steps
1 A Model: 0.05–3.00 A, 0.01 A steps
Pickup Accuracy (A secondary):
5 A Model: ±5% ±0.10 A
1 A Model: ±5% ±0.02 A
ANSI Extremely Inverse TOC Curve (U4 with 0.5 Time Dial)
Accuracy: ±5 cycles, ±5% between 2 and 30
multiples of pickup (within rated range
of current)
Undervoltage (27)
Setting Range: Off, 12.5–300.0 V
Accuracy: ±5% of setting ± 2 V
Pickup/Dropout Time: <1.5 cycle
Time Delay: 0.0–120.0 seconds, 0.1 second steps
Accuracy: ±0.5% ±0.25 cycle
Overvoltage (59)
Setting Range: Off, 12.5–300.0 V
Accuracy: ±5% of setting ± 2 V
Pickup/Dropout Time: <1.5 cycle
Time Delay: 0.0–120.0 seconds, 0.1 second steps
Accuracy: ±0.5% ±0.25 cycle
Negative-Sequence Overvoltage (59Q)
Setting Range: 12.5–200.0 V
Accuracy: ±5% of setting ± 2 V
Pickup/Dropout Time: <1.5 cycle
Time Delay: 0.0–120.0 seconds, 0.1 second steps
Accuracy: ±0.5% ±0.25 cycle
Volts/Hertz (24)
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 >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
Directional Power (32)
Instantaneous/Definite Time, 3 Phase Elements
Type: +W, –W, +VAR, –VAR
Pickup Settings Range, VA secondary:
5 A Model: 1.0–6500.0 VA, 0.1 VA steps
1 A Model: 0.2–1300.0 VA, 0.1 VA steps
Accuracy: ±0.10 A • (L-L voltage secondary) and
±5% of setting at unity power factor for
power elements and zero power factor
for reactive power element (5 A
nominal)
±0.02 A • (L-L voltage secondary) and
±5% of setting at unity power factor for
power elements and zero power factor
for reactive power element (1 A
nominal)
Pickup/Dropout Time: <10 cycles
Time Delay: 0.0–240.0 seconds, 0.1 second steps
Accuracy: ±0.5% ±0.25 cycle
Frequency (81)
Setting Range: Off, 20.0–70.0 Hz
Accuracy: ±0.1 Hz
Pickup/Dropout Time: <4 cycles
Time Delay: 0.0–240.0 seconds, 0.1 second steps
Accuracy: ±0.5% ±0.25 cycle
RTD Protection
Setting Range: Off, 1–250°C
Accuracy: ±2°C
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