1.11
Date Code 20080213 Instruction Manual SEL-351A Relay
Introduction and Specifications
Specifications
Time-Code Input
Relay accepts demodulated IRIG-B time-code input at PORT 1 or 2.
Synchronization (specification is with respect to the accuracy of
the time source)
Synchrophasor: ±10 µs
Other: ± 5 ms
Operating Temperature
–40° to +85°C (–40° to +185°F)
Note: LCD contrast impaired for temperatures below –20°C.
Weight
13 lbs (5.92 kg) 2U Rack Unit
Type Tests
Environmental Tests
Cold: IEC 60068-2-1:1990
[EN 60068-2-1:1993, Test Ad
16 hours at –40°C
Damp Heat, Cyclic: IEC 60068-2-30:1980
Test Db; 25° to 55°C
6 cycles, 95% humidity
Dry Heat: IEC 60068-2-2:1974 [EN 60068-2-
2:1993] Test Bd
16 hours at +85°C
Object Penetration and
Dust Ingress:
IEC 60529:1989 [EN 60529:1992]
IP30
Protection Against
Splashing Water:
IEC 60529:1989 [EN 60529:1992]
IP54 from the front panel using the
SEL-9103
Dielectric Strength and Impulse Tests
Dielectric: IEC 60255-5:1977, IEEE C37.90-1989
2500 Vac for 2 seconds on analog
inputs.
3000 Vdc for 2 seconds on power
supply, optoisolated inputs, and
output contacts.
Impulse: IEC 60255-5:1977, 0.5 J, 5000 V
Vibration: IEC 60255-21-1:1988
[EN 60255-21-1:1995], Class 1
Endurance, Class 2 Response
Electrostatic Discharge Test
ESD: IEC 60255-22-2:1996
[EN 60255-22-2:1996],
IEC 61000-4-2:1995
[EN 61000-4-2:1995],
Level 1, 2, 3, 4
RFI and Interference Tests
Fast Transient
Disturbance:
IEC 60255-22-4:1992
4 kV at 2.5 kHz and 5 kHz
IEC 61000-4-4:1995
[EN 61000-4-4:1995],
4 kV at 2.5 kHZ and 5 kHz
Conducted Radio
Frequency:
ENV 50141:1993
IEC 61000-4-6:1996
[EN 61000-4-6:1996]
IEC 60255-22-6:2001
10 Vrms
Digital Radio Telephone
RF:
ENV 50204:1995 10 V/m
at 900 MHz and 1.89 GHz
Radiated EMI: ENV 50140:1994
IEC 60255-22-3:2000
IEC 61000-4-3:1998
10 V/m
IEEE C37.90.2-1995
35 V/m
1 MHz Burst
Disturbance:
EC 60255-22-1:1988, (2500 V
common and differential mode)
Surge Withstand: IEC 60255-22-1:1998,
2.5 kV peak common mode,
2.5 kV peak differential mode
IEEE C37.90.1-1989
3.0 kV oscillatory, 5.0 kV fast
transient
Vibration and Shock Tests
Shock and Bump: IEC 60255-21-2:1988
[EN 60255-21-2:1995], Class 1 Shock
Withstand, Class 2 Shock Response
Seismic: IEC 60255-21-3:1993
[EN 60255-21-3:1995], Class 2
Certifications
ISO: Relay designed and manufactured using ISO 9001:2000
certified quality program.
CE Mark (available only in screw-terminal block version).
Processing Specifications
AC Voltage and Current Inputs
16 samples per power system cycle, 3 dB low-pass filter cut-off
frequency of 560 Hz.
Digital Filtering
One-cycle full cosine after low-pass analog filtering. Net filtering
(analog plus digital) rejects dc and all harmonics greater than the
fundamental.
Protection and Control Processing
Four times per power system cycle.
Relay Element Setting Ranges and Accuracies
Synchronism Check Elements (25) (Not in SEL-351A-1)
Slip Frequency
Pickup Range: 0.005–0.500 Hz, 0.001 Hz steps
Slip Frequency
Pickup Accuracy: ±0.003 Hz
Phase Angle Range: 0–80°, 1° steps
Phase Angle Accuracy: ±4°
Instantaneous/Definite-Time Overcurrent Elements (50)
(Definite-Time Elements not in SEL-351A-1)
Current Pickup (A secondary)
5 A nominal phase
channels:
0.25–100.00 A, 0.01 A steps (phase &
negative-sequence)
1.00–170.00 A, 0.01 A steps (phase-
to-phase)
0.050–100.000 A, 0.010 A steps
(residual ground)
1 A nominal phase
channels:
0.05–20.00 A, 0.01 A steps (phase &
negative-sequence)
0.20–34.00 A, 0.01 A steps (phase-to-
phase)
0.010–20.000 A, 0.002 A steps
(residual ground)
5 A nominal IN
channel:
0.250–100.000 A, 0.001 A steps
(neutral ground)
Courtesy of NationalSwitchgear.com
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