Damped Oscillatory Waves

Applicable Test Standards

International Electrotechnical Committee (IEC)

IEC 61000-4-18: Electromagnetic Compatibility (EMC) - Testing and Measurement Techniques – Damped Oscillatory Wave Immunity Test

IEC 60255-22-1: Measuring Relays and Protection Equipment - Electrical Disturbance Tests – 1 MHz Burst Immunity Tests

IEC 60947-1: Low-voltage Switchgear and Control Gear - General Rules

IEC 61000-6-5: Electromagnetic Compatibility (EMC) - Generic Standards - HEMP Immunity for Indoor Equipment

IEC 61000-4-10: Electromagnetic Compatibility (EMC) - Testing and Measurement techniques - Damped Oscillatory Magnetic Field Immunity Test

IEC 61000-4-25: Testing and Measurement Techniques - HEMP Immunity Test Methods for Equipment and Systems

American National Standards Institute (ANSI)

ANSI C37.90.1: IEEE Standard for Surge Withstand Capabilities (SWC) Tests for Relays and Relay Systems Associated with Electric Power Apparatus

A Oscillatory Wave Test System simulates effects in power supply communication networks.

Damped Oscillatory Slow Waves (100kHz and 1MHz)
Slow repetitive damped oscillatory waves occur mainly in power, control and signal cables installed in air insulated (AIS) high voltage and medium voltage (HV/MV) substations. The event has a relatively high transfer impedance resulting in a voltage impulse. A normalized voltage impulse of a damped sinewave as defined in the standards IEC 61000-4-18 and ANSI C37.90 are an industry standard. Typical impulse amplitudes are up to 3000 volts.

Damped Oscillatory “Fast Waves” (3MHz, 10MHz and 30MHz)
“Fast” repetitive damped oscillatory waves occur mainly in power, control and signal cables installed in gas insulated (GIS) high voltage and medium voltage (HV/MV) substations. The event has a relatively high transfer impedance resulting in a voltage impulse. A normalized voltage impulse of a damped sinewave as defined in the standard IEC 61000-4-18 has become an industry standard. Typical impulse amplitudes are up to 4000 volts.

Damped Oscillatory “Magnetic Fields” (100kHz and 1MHz)
The damped oscillatory magnetic fields are generated by busbars located in medium voltage and high voltage sub-stations.

IEC61000-4-10 specifies the test method for electronic equipment.

A 1m x 1m antenna is used to generate the magnetic (H) fields.