Lightning impulse high voltage test

AI Thread Summary
The discussion focuses on the differences between two lightning impulse waveforms. One waveform is identified as a "Combo Wave," commonly used in surge testing to simulate lightning strikes, with a reference to the EN 61000-4-5 standard. The second waveform remains unrecognized by the participants, prompting a request for further information and references. The inquiry seeks clarity on the characteristics and origins of both waveforms. Understanding these waveforms is essential for accurate high voltage testing and equipment protection.
MissP.25_5
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Hello, I am posting this here becase this is not a homework, it;s just something I need to know.
Please tell me what these two waveforms mean? I know that they're both lightning impulse waveform but what is the difference between those two, what gives them their shapes?
 

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where did you get these waveform images from?
have you got some references ?

cheers
Dave
 
MissP.25_5 said:
Hello, I am posting this here becase this is not a homework, it;s just something I need to know.
Please tell me what these two waveforms mean? I know that they're both lightning impulse waveform but what is the difference between those two, what gives them their shapes?

The first looks like a standard "Combo Wave" waveform used in Surge testing (which simulates lightning strikes to AC Mains supply lines leading to equipment). The standard test is EN 61000-4-5. I don't recognize the 2nd waveform...
 
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