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measurement of transformer zero sequence impedance

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salem

salem

Electrical
Joined
May 2, 2001
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38
Location
AE
how to measure (test) the zero sequence impedance of two winding, three phase Dyn11 33/11 kV 15 MVA transformer?
 
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For a Dyn transformer, is the following correct:

- 3 phase at delta side to be shorted together.
- 3 phase at y side to be shorted together.
- apply the voltage between one of the phases at y side and nutral.
- Z0 will be equall to V/I
 
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Apply the voltage that produces full rated current. The per cent of rated voltage is the per cent impedance.
 
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