Digital simulation of transient phenomena in power transformers

The switching of a power transformer to a source (electric power system) from one side leads to the occurrence of inrush currents. Typical for these currents when all other windings of the transformer are open-circuited is the following: the peak values are higher than the rated currents, the curves are highly unsymmetrical and diminish faster than the short-circuit currents. These characteristics are used by the transformer relay protections to distinguish between the short-circuit currents and the inrush currents.