1.12
SEL-787 Relay Instruction Manual Date Code 20150130
Introduction and Specifications
Specifications
Surge Immunity: IEC 61000-4-5:2005
IEC 60255-22-5:2008
2 kV line-to-line
4 kV line-to-earth
Surge Withstand Capability
Immunity:
IEC 60255-22-1:2007
2.5 kV common mode
1.0 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 61000-4-6:2008
IEC 60255-22-6:2001
10 Vrms
Magnetic Field Immunity: IEC 61000-4-8:2009
1000 A/m for 3 seconds
100 A/m for 1 minute
IEC 61000-4-9:2001
1000 A/m
Power Supply Immunity: IEC 60255-11:2008
EMC Emissions
Conducted Emissions: EN 55011:1998, Class A
IEC 60255-25:2000
Radiated Emissions: EN 55011:1998, Class A
IEC 60255-25:2000
Electromagnetic Compatibility
Product Specific: EN 50263:1999
Processing Specifications and Oscillography
AC Voltage and
Current Inputs: 16 samples per power system cycle
Frequency Tracking Range: 20–70 Hz (requires ac voltage inputs
option)
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:
Processing interval is 4 times per power
system cycle (except for math variables
and analog quantities, which are
processed every 100 ms). The 51
elements are processed 2 times per
power system cycle.
Oscillography
Length: 15 or 64 cycles
Sampling Rate: 16 samples per cycle unfiltered
4 samples per cycle filtered
Trigger: Programmable with Boolean expression
Format: ASCII and Compressed ASCII
Time-Stamp Resolution: 1 ms
Time-Stamp Accuracy: ±5 ms
Sequential Events Recorder
Time-Stamp Resolution: 1 ms
Time-Stamp Accuracy (with
respect to time source): ±5 ms
Relay Elements
Instantaneous/Definite-Time Overcurrent (50P, 50G, 50N, 50Q)
Pickup Setting Range, A secondary:
5 A models: 0.50–96.00 A, 0.01 A steps
1 A models: 0.10–19.20 A, 0.01 A steps
Accuracy: ±5% of setting plus ±0.02 • I
NOM
A
secondary (Steady State pickup)
Time Delay: 0.00–5.00 seconds, 0.01 seconds steps,
±0.5% plus ±0.25 cyc
Pickup/Dropout Time: <1.5 cyc
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
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: 0.05–1.00, 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
input, IN): 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: 1.5 ±0.25 cyc
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 (27)
Setting Range: Off, 12.5–300.0 V
Accuracy: ±1% of setting plus ±0.5 V
Pickup/Dropout Time: <1.5 cycle
Time Delay: 0.0–120.0 seconds, 0.1 second steps
Accuracy: ±0.5% plus ±0.25 cycle
Overvoltage (59)
Setting Range: Off, 12.5–300.0 V
Accuracy: ±1% of setting plus ±0.5 V
Pickup/Dropout Time: <1.5 cycle
Time Delay: 0.0–120.0 seconds, 0.1 second steps
Accuracy: ±0.5% plus ±0.25 cycle
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