Abridged Methodology Development for Analyzing Transformer Winding During Lightning Surges

Instances of lightning impulse pose a severe threat to transformer winding. A steep wavefront frequency of as great as tens of thousands of times, compared to peak rate of normal power frequency creates intense and rapid change of electric field in the transformer winding. This rapid change is constituted significantly in some part of winding, leading to excessive stress on insulation present in that part of winding. Researchers have used terminal measurements performed on transformer winding, to estimate the severity of lightning impulses. The detailed model has also been proposed in literature to understand the in-depth voltage distribution across the winding height. The time taken to develop such detailed model is high and resource intensive. This paper deals with proposition of methodology which requires minimal resources and takes comparatively less time to analyze impulse voltage distribution across winding turns, accurately.