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zero sequence generator

zero sequence generator

zero sequence generator

(OP)
Hi,

If the manufacture only provides positive sequence impedance for a 3 winding core type, 12/11/0.415kV transformer with out giving the zero sequence impedance, what approximation can I take?

Any links or doc that I can refer to will be very much appreciated.

Thanks

RE: zero sequence generator

Depends on the connection (vector group) and which winding you are talking about.  

Try a Google search for transformer symmetrical components.

RE: zero sequence generator

wonderchi,

"..12/11/0.415kV transformer ... "

From the above voltages it sounds to me that you are in the IEC world.

Please refer to Table 1 of IEC 60076-8 for a complete list of typical zero sequence impedance values for 3-winding transformers with different connection symbols. But, if you are looking for an accurate value, the only contact is the transformer manufacturer.

Hope this helps.

Kiri

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