Forces under double inrush condition - Summary

Axial forces on HV winding under inrush condition need to be evaluated taking into account residual core magnetisation and the presence of a rectifier transformer connected to the MV. The regulating transformer has to face double inrush currents (its own and the one of the rectifier transformer).

The currents obtained by circuit transient computation matched the values measured on site during switch-on transients.

Axial forces distribution calculated allows to prevent the failure on the HV winding, defining proper corrective actions!

Description