Coils design influence on corona inception

Corona Inception Voltage (CIV) using design of experiment (DOE) analysis has provided valuable insights into the influence of design parameters on electrical phenomena associated with both individual bars and pairs of bars. For single insulated bars results indicate that no specific design element dominates corona incidence, considering the high variance of the results. In contrast, the DOE analysis for insulated bar pairs, arrangement, presented a high convergence of data, and demonstrated a clear influence of the number of end-winding corona protection (ECP) layers, as well as mica layer protection over the ECP area. The type of ECP tape was also statistically significant for CIV prevention. These findings are important for real stator windings design in simulated conditions.