Transformer Starting Current

Transformer capacity : 2500 KVA

Transformer rated current on HV side - 2500/22/1.732 = 65.6 Amp

Transformer starting Magnetizing current : 2-3 times the rated current

: i.e. 131 Amp to 196.8 Amp

Starting current depend upon the switching ON cycle point w.r.t. the residual magnetic field in the core leading to saturation of the magnetic core, & then leading to high inrush currents, limited by effective impedence of the transformer at the time of switching ON. w.r.t. hysteresis point of magnetization.

Not the value of 6.25% as mentioned above, which is the impedence during steady state operation.

What will be value of Current for positive peak , negetive peak and at zero cross over of voltage wave if transformer is charged initially after installation.

Inrush current will depend on what grade steel core is made from, maximum flux density in core, transformer design and source impedance.

Best source for inrush current would be transformer manufacture.

This may help you

Transformer Calculation