I received four responses to my question about the peak impulse test levels for Insulation co-ordination.
Three of the four expressed that peak is peak, thus you do not add a rated impulse on top of the peak sine wave, but the total peak value is as defined. In the 1000 V CAT III example I proposed, the peak value will be 8,000 V and not 9,414 V as would be derived from adding the 8 KV impulse to the sine wave peak . The measured values for impulses has been expressed as many different tests over many years, thus no report to define methods or verify results. Thanks to the four for their input. Wayne Thomas Tektronix [email protected]
