GWR Analysis on the Effect of Lightning Strikes and Damages in Distribution Transformer

초록

Distribution transformers are known to be affected by not only direct lightning strikes but also induced lightning induced overvoltage due to their relatively low insulation strength to withstand lightning strikes. In this regard, the purpose of this paper is to implement an explanatory model between the lightning strikes and the lightning failures of distribution transformers. Since spatial distributions are hard to be analyzed by the ordinary least square (OLS) method, geographically weighted regression (GWR) analysis was applied to find the explanatory properties between the spatial lightning strikes and the spatial lightning failure transformers. As a result of the regression analysis, GWR analysis shows improved explanatory power compared to the OLS method and enables additional analysis to be performed by specifying points showing high explanatory power and regression coefficients in the visual analysis. © © The Korean Institute of Electrical Engineers.

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