1.23
Date Code 20100129 Instruction Manual SEL-751A Relay
Introduction and Specifications
Specifications
Surge Immunity: IEC 61000-4-5: 2001
2 kV line-to-line
4 kV line-to-earth
Surge Withstand Capability
Immunity: IEC 60255-22-1:1988
2.5 kV common mode
2.5 kV differential mode
1 kV common mode on comm. ports
IEEE C37.90.1-2002
2.5 kV oscillatory
4 kV fast transient
Conducted RF Immunity: IEC 61000-4-6: 2003, 10 Vrms
Magnetic Field Immunity: IEC 61000-4-8: 2001
1000 A/m for 3 seconds
100 A/m for 1 minute
EMC Emissions
Conducted Emissions: EN 55011:1998, Class A
Radiated Emissions: EN 55011:1998, Class A
Electromagnetic Compatibility
Product Specific: EN 50263:1999
Certifications
ISO: Relay is designed and manufactured
using ISO 9001: 2000 certified quality
program.
UL/CSA: UL 61010-1 and C22.2 No. 61010-1
CE: CE Mark–EMC Directive
Low Voltage Directive
EN 61010-1:2001
EN 60947-1
EN 60947-4-1
EN 60947-5-1
Hazardous Locations
Approvals:
Complies with UL1604, CSA 22.2
No. 213, and EN 60079-15
(Class 1, Division 2).
Processing Specifications
AC Voltage and
Current Inputs: 16 samples per power system cycle
Frequency Tracking Range: 20–70 Hz
Digital Filtering: One-cycle cosine after low-pass analog
filtering. Net filtering (analog plus
digital) rejects dc and all harmonics
greater than the fundamental.
Protection and
Control Processing:
4 times per power system cycle
(except for math variables and analog
quantities, which are processed every
100 ms)
Relay Elements
Instantaneous/Definite-Time Overcurrent (50P, 50G, 50N, 50Q)
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
50 mA models: 5.0–1000.0 mA, 0.1 mA steps
2.5 mA models: 0.13–12.50 mA, 0.01 mA steps
(The 50N elements in the 2.5 mA and
50 mA models have a built-in 30 ms
security qualifier time delay.)
Accuracy: ±5% of setting ±0.02 • I
NOM
A secondary (Steady State pickup)
Time Delay: 0.00–5.00 seconds, 0.01 seconds steps
Pickup/Dropout Time: <1.5 cycles
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 ±0.02 • I
NOM
A secondary (Steady State pickup)
Pickup/Dropout Time: 2–5 ms/1 cycle
Arc-Flash Time-Over-Light (TOL1–TOL4)
Pickup Setting Range, % of
Full Scale: 3.0–20.0%
Pickup/Dropout Time: 2–5 ms/1 cycle
Inverse-Time Overcurrent (51P, 51G, 51N, 51Q)
Pickup Setting Range, A Secondary:
5 A models: 0.50–16.00 A, 0.01 A steps
1 A models: 0.10–3.20 A, 0.01 A steps
50 mA models: 5.0–160.0 mA, 0.1 mA steps
2.5 mA models: 0.13–2.00 mA, 0.01 mA steps
Accuracy: ±5% of setting ±0.02 • I
NOM
A
secondary (Steady State pickup)
Time Dial
US 0.50–15.00, 0.01 steps
IEC 0.05–1.00, 0.01 steps
Accuracy: ±1.5 cycles, ±4% between 2 and 30
multiples of pickup (within rated
range of current)
Undervoltage (27)
Setting Range: Off, 0.02–1.00 • VNOM
(VNOMisasetting.)
Accuracy: ±1% of setting ± 0.5 V (±5% of setting
±2 V with the xx71xx card)
Pickup/Dropout Time: <1.5 cycles
Overvoltage (59, 59G, 59Q)
Setting Range: Off, 0.02–1.20 • VNOM
Accuracy: ±1% of setting ±0.5 V (± 5% of setting
± 2 V with the xx71xx card)
Pickup/Dropout Time: <1.5 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) and
±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) and
±5% of setting at unity power factor
for power elements and zero power
factor for reactive power elements
(1 A nominal)
Pickup/Dropout Time: <10 cycles
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