1.18
SEL-751 Relay Instruction Manual Date Code 20170927
Introduction and Specifications
Specifications
Arc-Flash Instantaneous Overcurrent (50PAF, 50NAF)
Pickup Setting Range, A Secondary:
5 A models: 0.50–100.00 A, 0.01-A steps
1 A models: 0.10–20.00 A, 0.01 A-steps
Accuracy: 0 to +10% of setting plus ±0.02 • I
NOM
A secondary (Steady State pickup)
Pickup/Dropout Time: 2–5 ms/1 cycle
Arc-Flash Time-Overlight (TOL1–TOL8)
Pickup Setting Range, % of
Full Scale:
3.0–80.0% (Point Sensor)
0.6–80.0% (Fiber Sensor)
Pickup/Dropout Time: 2–5 ms/1 cycle
Inverse-Time Overcurrent (51P, 51G, 51N, 51Q)
Pickup Setting Range, A Secondary:
5 A models: 0.25–24.00 A, 0.01 A steps (51N)
1 A models: 0.05–4.80 A, 0.01 A steps (51N)
Accuracy: ±5% of setting plus ±0.02 • I
NOM
A
secondary (Steady State pickup)
Time Dial
US: 0.50–15.00, 0.01 steps
IEC: 0.01–1.50, 0.01 steps
Accuracy: ±1.5 cycles, plus ±4% between 2 and 30
multiples of pickup (within rated
range of current)
IEC Thermal Element (49IEC)
Setting Range: Trip Pickup, 1–150%
Alarm Pickup, 1–100%
Pickup Accuracy: ±2% (for I I
NOM
)
±5% (for 0.4 • I
NOM
< I < I
NOM
)
Time to Trip/Reset Accuracy: ±5% plus ±0.5 s of the calculated value
Undervoltage (27P, 27PP, 27S)
Setting Range: OFF, 2.00–300.00 V (Phase elements,
phase-to-phase elements with delta
inputs or synchronism voltage input)
OFF, 2.00–520.00 V (Phase-to-phase
elements with wye inputs)
Accuracy: ±1% of setting plus ±0.5 V
Time Delay: 0.00–120.00 seconds, 0.01-second steps
Pickup/Dropout Time: <1.5 cycles
Overvoltage (59P, 59PP, 59G, 59Q, 59S)
Setting Range: OFF, 2.00–300.00 V (Phase elements,
phase-to-phase elements with delta
inputs or synchronism voltage input)
OFF, 2.00–520.00 V (Phase-to-phase
elements with wye inputs)
Accuracy: ±1% of setting plus ±0.5 V
Time Delay: 0.00–120.00 seconds, 0.01-second steps
Pickup/Dropout Time: <1.5 cycles
Inverse-Time Undervoltage (27I)
Setting Range: OFF, 2.00–300.00 V (Phase elements,
positive-sequence elements, phase-to-
phase elements with delta inputs or
synchronism-check voltage input)
OFF, 2.00–520.00 V (Phase-to-phase
elements with wye inputs)
Accuracy: ±1% of setting plus ±0.5 V
Time Dial: 0.00–16.00 s
Accuracy: ±1.5 cyc plus ±4% between 0.95 and
0.1 multiples of pickup
Inverse-Time Overvoltage (59I)
Setting Range: OFF, 2.00–300.00 V (Phase elements,
sequence elements, or phase-to-phase
elements with delta inputs or
synchronism voltage input)
OFF, 2.00–520.00 V (Phase-to-phase
elements with wye inputs)
Accuracy: ±1% of setting plus ±0.5 V
Time Dial: 0.00–16.00 s
Accuracy: ±1.5 cyc plus ±4% between 1.05 and
5.5 multiples of pickup
Harmonic Blocking
Pickup Range (% of
fundamental): 5–100%
Pickup Accuracy
(A secondary):
5 A Model: ±5% plus ±0.10 A of
harmonic current
1 A Model: ±5% plus ±0.02 A of
harmonic current
Time Delay Accuracy: ±0.5% plus ±0.25 cycle
Vector Shift (78VS)
Pickup Setting Range: 2.0–30.0 deg, 0.1-degree increment
Accuracy: ±10% of the pickup setting, ±1 degree
Voltage Supervision
Threshold:
20.0–100.0% • VNOM
Pickup Time: <3 cycles
Power Elements (32)
Instantaneous/Definite Time,
3 Phase Elements Type:
+W, –W, +VAR, –VAR
Pickup Setting Range, VA Secondary:
5 A models: 1.0–6500.0 VA, 0.1 VA steps
1 A models: 0.2–1300.0 VA, 0.1 VA steps
Accuracy: ±0.10 A • (L-L voltage secondary) plus
±5% of setting at unity power factor
for power elements and zero power
factor for reactive power elements
(5 A nominal)
±0.02 A • (L-L voltage secondary) plus
±5% of setting at unity power factor
for power elements and zero power
factor for reactive power elements
(1 A nominal)
Time Delay: 0.0–240.0 seconds, 0.1-second steps
Pickup/Dropout Time: <10 cycles
Power Factor (55)
Setting Range: OFF, 0.05–0.99
Accuracy: ±5% of full scale
for current 0.5 • I
NOM
Time Delay: 1–240 seconds, 1-second steps
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