Crest Factor & Harmonic Distortion

[Haji]

Besoeker actually answered the origional question in post 2. There was a great deal of useful information exchanged in the following posts. I thank all for helping. I still need to continue to monitor our waveform.

I found a later version of Std-4 & the 5% harmonic distortion had been added to the crest factor criteria.

The crest factor of an arbitrary voltage wave could be within 5% of square root of 2. But this voltage wave can be used for dielectric testing only when it is a nearly pure sine wave per standard. This may be ensured by checking the THD of the sine wave to be within 5%.

From the crest factor alone, it is not reliable to determine the extent of harmonic distortion, even though a method based on crest factor for derating transformers for harmonic distortion has been recommended by CBEMA as pointed by Sahib.

 

[Sahib]

Thanks, Haji, for your correction.