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I have to design a 3ph transformer where the zero sequence impedance must be less than 1.5%.
This is the first time I am dealing with such a case and I have no idea, where to begin.
Can anybody help me please!
Thanks to all.
Very simple explanation to a complex question
http://www.docstoc.com/docs/2370125/Analysis-of-a-three-limb-core-power-transformer-under-earth-fault-R