Electrical transients Test

• This test checks equipment operation by applying repetitive electrical transient bursts over AC, DC, and signal and telecommunication power lines.
• Electrical transients and/or bursts are generated by switching maneuvers in the interruption of inductive loads and contact bounce in relays, motors, compressors, etc.
• Other types of equipment that unintentionally produce RF electromagnetic radiation energy include inductive load switches, arc welding equipment, fluorescent lights, etc.

⇒ Levels: Depends on the standard: from 500 V to 4 kV.

⇒ Criterion: After the test, the equipment must be able to operate without any degradation or loss of function. A certain degradation of performance is allowed during the test (criterion B, usually).

Power

Shock waves

• This test checks equipment operation by applying bursts of overvoltage and overcurrent on AC, DC, signal and telecommunication power lines.
• Unidirectional shock waves are caused by transient overvoltages, such as those caused by lightning strikes or switching operations.
• The effect of a direct lightning strike on the equipment is not considered.
• Application: In common and differential mode. Furthermore, in the case of AC, the wave is coupled at different phase angles.

⇒ Levels: Depends on the standard: from 500 V to 4 kV.

⇒ Criterion: After the test, the equipment must be able to operate without any degradation or loss of function. A certain degradation of performance is allowed during the test (criterion B, usually).

Line – Line

 Line – Ground