Estimation on on-load vibration of transformer windings

In this paper the discussions on the on-load vibration of transformer windings are presented. Firstly, the vibration of the windings was investigated on the 6 kVA model coil both experimentally and analytically. On the on-load condition, the axial vibration of conductors was measured by the accelerometers. Numerical analysis was also conducted on the model coil. The electromagnetic force was calculated by a conventional mirror method. The steady state response of the windings was estimated by the finite element analysis. The calculated result showed fairly good agreement with the measurement and the validity of the numerical method was affirmed. Finally, the vibrations of the full-scale transformer windings were estimated with the same calculation method.