The natural oscillation frequency of the winding depends to a large extent on the degree of compaction after equipment, because the elastic coefficient of the insulation is related to this. The tighter the pressure, the higher the natural oscillation frequency of the winding. Therefore, increasing the pressing force may make the dynamic plus, it may also reduce the dynamic force, which is related to whether the natural frequency is close to or far from the forced oscillation frequency.
Up to now, operating practices at home and abroad have proved that the dynamic stability of the transformer caused by the short circuit has a certain relationship with the calculation of the electrodynamic force and the verification strength according to the static method during the design, and it may be due to this reason.
The development of research on dynamic force calculation methods and transformer vibration calculations is still being developed.
