Aug 11, 2014 - 08:31 AM
Attached is an example for a single phase transformer, but it can be extended to a three phase. I have attached a library file that allows setting up multi-winding 3-phase transformers.
The single-phase transformer example uses a four winding transformer to represent a two-winding transformer. One winding is used to represent the healthy winding, while three-windings are used to represent the faulty winding. Please see the explanatory notes included in the PSCAD file.
The one thing about internal fault modeling is that it is required to know the leakage impedance from the healthy winding to each section of the winding under fault as well as between the different sections of the winding under fault. Finding the impedance information between all the winding sections requires knowing the internal configuration of the transformer and be able to carry out finite element simulations (or similar) for each configuration. Usually only the manufacturer would have such capabilities.
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