Dear all
I want to run a contingency analysis (n-1) using Matpower 5.1The code I have is 
automated to take out one branch at a time.
However, three winding transformers are modelled as three different branches. 
So, If I want to simulate the outage of such a transformer I must take three 
braches at a time. The problem consists on identifying the three winding 
transformers. How do I identify a three winding transformers within the 
mpc.branch matrix? 
I tried to do it by checking different baseKV in mpc.bus; however all baseKV 
values are the same.
Has anyone had the same inquiry?
Can anyone give me some hints?
Best regards,Jesús López

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