estressedwithtransientovervoltagesofawidevarietyofwaveshapescausedbylightningaswellasswitching.Hence,itisnecessarytoestimatethedielectricstrengthoftheinsulationunderthesenonstandardimpulsewaveshapes[].MorethanofthefaiithbothandtappingsandwithNon-standardimpulses.IV.ANALYSISOFTHEOBSERVATIONForarangeofappliedwaves(bothstandardandnonstandard)anddifferentwindingconnections,comparisonoftheinsulationcharacteristicsundernon-standardlightningimpulsevoltagewaveformswhichrepresentactualsurgewaveformsencounteredinthefieldandthecharacteristicsunderthestandardlightningimpulsewaveformquantitativelycanbemade[].ItmaybementionedherethatforthemajorinsulationtheeffectsofStandardwaveshapesandfortheminorinsulationtheeffectsoftheNonstandardwaveshapesgetsspecialattention.Thefullwavebecauseofitsrelativelylongdurationcausesmajoroscillationsanddevelopshighvoltagesacrossthewindingsandbetweenthewindingandground.Thechoppedwavesbecauseofitsgreaterampli