Eliminating VT uncertainties in modeling ferroresonance phenomena caused by single phase-to-ground faults in isolated neutral network

It is commonly recognized that correct transformer model (particularly topological one) a key element for any ferroresonance simulations. This paper represents line of reasoning by which reliable voltage (VT) can be constructed given substantial uncertainties in its parameters and characteristics. Starting with catalog data electric steels typical leakage inductances 6-kV VTs, an isolated neutral network three inductive VTs initially fitted to reproduce detail ferroresonant behavior chosen capacitance. Then, validity the verified accurate predictions processes all other capacitance values available thus different modes recorded during full-scale factory tests. Possibilities simplify VT neglecting dynamic, then entire core losses hysteresis are also shown.