Lightning Overvoltage Protection of Step-Up Transformer Inside a Nacelle of Onshore New-Generation Wind Turbines

This paper presents an electromagnetic transient analysis of lightning-initiated overvoltage stresses the step-up transformers installed inside a nacelle onshore, multi-megawatt, new-generation wind turbines. The increase in turbine (WT) nominal power output, necessitated introducing transformer into nacelle. A is subjected to completely different from those present if it were at base WT tower. has serious repercussions on its protection (i.e., selection and installation surge arresters) insulation coordination. Furthermore, medium-voltage cables (inside tower) also problematic when considering their length, proximity tower wall, screen grounding practices, needs be tackled conjunction with that transformer. detailed models for various components latest-generation WTs, intended fast-front assembled within EMTP software package. We further comprehensive results lightning-transient numerical simulations, covering both upward downward (first subsequent) strikes, analysis, recommendations optimal arresters