Answer / guest

Surge:Waveform appearing natuarally in power system due to
phenomemon like lightning,switching etc.

Impulse:Waveform generated artificially for the testing of
insulation of equipment.

Author:arbelectbit@yahoo.com

Answer / vijay

Surge:Waveform appearing natuarally in power system due to
phenomemon like lightning,switching etc.

Impulse:Waveform generated artificially for the testing of
insulation of equipment.

Answer / john

Answer #2 is accurate. The wave form is identical for both, and depends on the system being tested, power line frequencies typically use a 1.2uS/50 uS open cirucit waveform (IEEE 4). To my knowledge, the main difference is that the surge test is applied to the line conductors while the sample is under power, and the generator of the pulse can be set to trigger at 0°, 90°, 180°, and 270°. The Impulse test is run across an insulating barrier such as solid insulation, or a clearance through air.

Answer / rachan

surge has only high voltage and we cant define its wave fform.surge test conducting in both stage, equipment under ON or OFF condition.
where impulse has a wave form with fixed raise time,saturation time and fall time.

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