Date Code 20000421 Specifications 2-3
SEL-251, -2, -3 Instruction Manual
Environmental
Type Tests
IEEE C37.90-1989
IEEE Standards for Relays and Relay Systems Associated with Electrical Power
Apparatus, Section 8: Dielectric Tests
Severity Level: 2500 Vac on analog inputs; 3000 Vdc on power supply, contact
inputs and contact outputs
IEEE C37.90.1-1989
IEEE Standard Surge Withstand Capability (SWC) Tests for Protective Relays
and Relay Systems
Severity Level: 3.0 kV oscillatory, 5.0 kV fast transient
IEEE C37.90.2 (Issued for trial use December 1987)
IEEE Trial-Use Standard, Withstand Capability of Relay Systems to Radiated
Electromagnetic Interference from Transceivers
Severity Level: 10 V/m
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
IEC 68-2-1 Fifth Edition - 1990
Environmental testing, Part 2: Tests - Test Ad: Cold
Severity Level: 16 hours at -40°C
IEC 68-2-2 Fourth Edition - 1974
Environmental testing, Part 2: Tests - Test Bd: Dry heat
Severity Level: 16 hours at +85°C
IEC 68-2-30 Second Edition - 1980
Basic environmental testing procedures, Part 2: Tests - Test Db and guidance:
Damp heat, cyclic (12 + 12-hour cycle)
Severity Level: 55°C, 6 cycles
IEC 255-5 First Edition - 1977
Electrical relays, Part 5: Insulation tests for electrical relays,
Section 6: Dielectric Tests
Severity Level: Series C (2500 Vac on analog inputs; 3000 Vdc on power
supply, contact inputs and contact outputs)
Section 8: Impulse Voltage Tests
Severity Level: 0.5 Joule, 5000 volt
IEC 255-21-1 First Edition - 1988
Electrical relays, Part 21: Vibration, shock, bump, and seismic tests on
measuring relays and protection equipment, Section One - Vibration tests
(sinusoidal)
Severity Level: Class 1
IEC 255-21-2 First Edition - 1988
Electrical relays, Part 21: Vibration, shock, bump, and seismic tests on
measuring relays and protection equipment, Section Two - Shock and bump tests
Severity Level: Class 1
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