1.12
SEL-351S Relay Instruction Manual Date Code 20080103
Introduction and Specifications
Specifications
IEC 60255-5 Dielectric Tests: 1977
2500 Vac for 2 seconds on analog
inputs, optoisolated inputs, and
output contacts
3100 Vdc for 2 seconds on power
supply
Impulse: IEC 60255-5:1977 Electrical relays,
Part 5: Insulation tests for electrical
relays, Section 6: Dielectric Tests,
Series C (2500 Vac on analog inputs;
3000 Vdc on power supply, contact
inputs, and contact outputs).
Section 8: Impulse Voltage Tests,
0.5 Joule 5 kV
Electrostatic Discharge Test
ESD: IEC 60255-22-2:1996 Electrical
disturbance tests for measuring relays
and protective equipment, Section 2:
Electrostatic discharge tests, Severity
Level 4 (8 kV contact discharge all
points except serial ports, 15 kV air
discharge to all other points)
RFI and Interference Tests
Surge Withstand: IEEE C37.90.1-1989 IEEE SWC Tests
for Protective Relays and Relay
Systems (3 kV oscillatory, 5 kV fast
transient)
Fast Transient
Disturbance:
IEC 60255-22-4:1992 Electrical
disturbance tests for measuring relays
and protection equipment, Section 4:
Fast transient disturbance test,
Severity Level 4 kV at 2.5 kHz and
5kHz
Radiated EMI: IEC 60255-22-3:1989 Electrical relays,
Section 3: Radiated electromagnetic
field disturbance tests, Severity Level
3 (10 V/m)
IEEE C37.90.2-IEEE Trial-Use
Standard, Withstand Capability of
Relay Systems to Radiated
Electromagnetic Interference from
Transceivers, 35 V/m (type test).
Exceptions:
5.5.2(2) Performed with 200
frequency steps per octave.
5.5.3 Digital Equipment Modulation
Test not performed.
5.5.4 Test signal turned off between
frequency steps to simulate keying.
Surge Withstand: IEC 60255-22-1:1988 Electrical
disturbance tests for measuring relays
and protection equipment, Part 1:
1 MHz burst disturbance tests.
Severity Level 3 (2.5 kV common
mode, 2.5 kV differential)
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 Electrical relays,
Part 21: Vibration, shock, bump, and
seismic tests on measuring relays and
protection equipment, Section Two:
Shock and bump tests, Class 1
IEC 60255-21-3:1993 Electrical relays,
Part 21: Vibration, shock, bump, and
seismic tests on measuring relays and
protection equipment, Section Three:
Seismic tests, Class 2
Sinusoidal Vibration: IEC 60255-21-1:1988 Electrical relays,
Part 21: Vibration, shock, bump, and
seismic tests on measuring relays and
protection equipment, Section One:
Vibration tests (sinusoidal), Class 1
Certifications
ISO: Relay is designed and manufactured to an ISO-9001 certified
quality program.
UL/CSA: UL recognized to the requirements of UL-508; CSA
C22.2, N.14 for Industrial Control Equipment; and UL-1053,
Ground-Fault Sensing and Relay Equipment.
CE: CE Mark
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 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
Relay Element Pickup Ranges and Accuracies
Instantaneous/Definite-Time Overcurrent Elements
Pickup Range: 0.25–100.00 A, 0.01 A steps
(5 A nominal)
1.00–170.00 A, 0.01 A steps
(5 A nominal—for phase-to-phase
elements)
0.050–100.000 A, 0.010 A steps
(5 A nominal—for residual ground
elements)
0.05–20.00 A, 0.01 A steps
(1 A nominal)
0.20–34.00 A, 0.01 A steps
(1 A nominal—for phase-to-phase
elements)
0.010–20.000 A, 0.002 A steps
(1 A nominal—for residual ground
elements)
0.005–2.500 A, 0.001 A steps
(0.2 A nominal neutral channel (IN)
current input)
0.005–1.500 A, 0.001 A steps
(0.05 A nominal neutral channel (IN)
current input)
Steady-State
Pickup Accuracy:
±0.05 A and ±3% of setting
(5 A nominal)
±0.01 A and ±3% of setting
(1 A nominal)
±0.001 A and ±3% of setting
(0.2 A nominal neutral channel (IN)
current input)
±0.001 A and ±5% of setting
(0.05 A nominal neutral channel (IN)
current input)
Transient Overreach: ±5% of pickup
Time Delay: 0.00–16,000.00 cycles, 0.25 cycle steps
Timer Accuracy: ±0.25 cycle and ±0.1% of setting
Note: See pickup and reset time curves in Figure 3.5 and
Figure 3.6.
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