三绕组变压器阻抗折算

为薇薇

Conversion of equivalent Delta to Y circuit impedance of 3-winding transformers

晨曦里的啊不

The impedances required in ETAP Transformer Editor are test data (or short-circuit
' z& y6 h$ Q8 x0 k( L( jimpedances) given by manufacturer. They are NOT THE EQUIVALENT Delta-circuit
0 S- @& k& }! p! A% P- gimpedances of transformer. These values can be converted to the individual winding
impedances or the equivalent Y-circuit impedances using the following formulas:
Zp = 0.5 (Zps + Zpt – Zst)
2 Z) `& M* ^9 }Zs = 0.5 (Zps + Zst – Zpt)
! r0 [) N3 X, b+ H% ]6 JZt = 0.5 (Zpt + Zst – Zps)
/ a0 @) d7 q5 `* B* ATo obtain the equivalent Delta-circuit impedances the Y to D-circuit transformation
formula is as follows:
7 t9 E3 `9 d/ h3 z( C+ a9 AZPS = (ZpZs + ZpZt + ZsZt)/Zt
ZPT = (ZpZs + ZpZt + ZsZt)/Zs
5 R7 a$ r8 W7 K$ z8 H) EZST = (ZpZs + ZpZt + ZsZt)/Zp

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