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Just wondering anyone know what are rules for the map strings for 3-winding tranformers since they are inconsistent.

Usually, the map strings for 3-winding transformers are :

str_mapstr = 'T3 %s %s %s %s' % (W1NUMBER, W2NUMBER, W3NUMBER, ID)

For example, a 3-winding transformer with winding-1 number 100, winding-2 number 200, winding-3 number 300 and ID "xx" would usually yield: "T3 100 200 300 xx".

But sometime, the W1NUMBER is swapped with W2NUMBER. Therefore, the above example would become : "T3 200 100 300 xx".

This makes more complicated to use the "sliderPy" module, though not a lot.

Anyone know the logics that PSSE uses here?