Inrush

Inrush

Is there any way to know the inrush value in OPS, assuming that a Delta-Wye transformer will be back-fed (connected in reverse)? –

If the transformer was connected in reverse, the magnitude of the inrush current would be almost proportional to the exact kVA as the primary is. The only difference comes from the relative location of the winding i.e. if it is outside it would have a greater air core inductance and vice-versa. OPS can calculate this current by reversing P1 and S1.

The Absolute Peak Current (Phase Current) and Practical Max. Value the OPS calculate when we run Impedance in the Extended Analysis. Are these rms or peak current? Do you know the duration of each one?

The absolute peak current and practical max. value that OPS calculates are peak current. Please see attached for more information.The duration depends on the flux density of core and other factors, so we can not define it.