Modeling 3-Phase Transformer with a Grounded Resistance in SimpowerSystems

Hello All,

I have a Delta/Wye transformer. The secondary is grounded through a resistor of 300 ohms. I can't find a transformer component with resistor grounding connection. Can you please help?

Answer 1

[Vinay]

Hi @Quan Hu,

The "Three phase transformer(2 windings)" models the wye-delta transformer using three single-phase transformers. The neutral of the 'Wye' at the secondary can be accesed by changing the secondary winding as "Yn"

This adds a neutral point at the secondary side of the winding which can be connected to the ground through a resistance as shown below

I hope this helps!