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Transformer zero sequence impedance compared to positive

Transformer zero sequence impedance compared to positive

Transformer zero sequence impedance compared to positive

(OP)
Is it possible that zero sequence impedance is equal to or greater than positive sequence impedance for a power transformer, whose connection is Dyn 11 33/11 kV, 15 MVA ?

RE: Transformer zero sequence impedance compared to positive

Generally not, there isn't generally anything that can add to the impedance in the zero-sequence.  In a bank of three transformers Z0 will equal Z1, as it will in a shell form three-phase transformer.  But, in a 3-phase core form transformer Z0 will usually be in the range of 85% of Z1.

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