SEL-787-3, -4 Data Sheet Schweitzer Engineering Laboratories, Inc.
28
Time Dial:
US: 0.50–15.00, 0.01 steps
IEC: 0.05–1.00, 0.01 steps
Accuracy: ±1.5 cycles plus ±4% between 2 and 30
multiples of pickup (within rated range
of current)
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% plus ±0.10 A
1 A Model: ±5% plus ±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% plus ±0.10 A
1 A Model: ±5% plus ±0.02 A
Time Delay Accuracy: ±0.5% plus ±0.25 cycle
Restricted Earth Fault (REF)
Pickup Range (per unit of
INOM of neutral current
inputs, IN, and/or
Winding 3): 0.05–3.00 per unit, 0.01 per-unit steps
Pickup Accuracy (A secondary):
5 A Model: ±5% plus ±0.10 A
1 A Model: ±5% plus ±0.02 A
Timing Accuracy:
Directional Output: 1.25–1.75 cycles
ANSI Extremely Inverse
TOC Curve (U4 With
0.5 Time Dial):
±5 cycles plus ±5% between 2 and 30
multiples of pickup (within rated range
of current)
Undervoltage (27P, 27PP, 27S)
Setting Range: OFF, 12.50–300.00 V (Phase elements,
phase-to-phase elements with delta
inputs or synchronism voltage input)
OFF, 12.50–520.00 V (Phase-to-phase
elements with wye inputs)
Accuracy: ±1% of setting plus ±0.5 V
Pickup/Dropout Time: <1.5 cycle
Time Delay: 0.00–120.00 seconds, 0.01 second steps
Accuracy: ±0.5% plus ±0.25 cycle
Overvoltage (59P, 59PP, 59G, 59Q, 59S)
Setting Range: OFF, 12.50–300.00 V (Phase elements,
phase-to-phase elements with delta
inputs or synchronism voltage input)
OFF, 12.50–520.00 V (Phase-to-phase
elements with wye inputs)
Accuracy: ±1% of setting plus ±0.5 V
Pickup/Dropout Time: <1.5 cycle
Time Delay: 0.00–120.00 seconds, 0.01 second steps
Accuracy: ±0.5% plus ±0.25 cycle
Volts/Hertz (24)
Definite-Time Element
Pickup Range: 100–200%
Steady-State Pickup
Accuracy: ±1% of set point
Pickup Time: 25 ms @ 60 Hz (Max)
Time-Delay Range: 0.00–400.00 s
Time-Delay Accuracy: ±0.1% plus ±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 set point
Pickup Time: 25 ms @ 60 Hz (Max)
Curve: 0.5, 1.0, or 2.0
Factor: 0.1–10.0 s
Timing Accuracy: ±4% plus ±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 set point
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: 0.00–240.00 seconds, 0.01 second steps
Accuracy: ±0.5% plus ±0.25 cycle
Frequency (81)
Setting Range: OFF, 20.0–70.0 Hz
Accuracy: ±0.01 Hz (V1 > 60 V) with voltage
tracking
Pickup/Dropout Time: <4 cycles
Time Delay: 0.00–240.00 seconds, 0.01 second steps
Accuracy: ±0.5% plus ±0.25 cycle
RTD Protection
Setting Range: OFF, 1–250°C
Accuracy: ±2C
RTD Open-Circuit
Detection: >250°C
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