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
6 ?& M7 a, v, V$ v" Rimpedances) given by manufacturer. They are NOT THE EQUIVALENT Delta-circuit
impedances of transformer. These values can be converted to the individual winding
impedances or the equivalent Y-circuit impedances using the following formulas:
& N4 ?, [* i$ c2 tZp = 0.5 (Zps + Zpt – Zst)
9 x9 x& D' k/ k7 ^; [! r* vZs = 0.5 (Zps + Zst – Zpt)
Zt = 0.5 (Zpt + Zst – Zps)
4 M7 G; k/ \0 S. R8 }/ y( \To obtain the equivalent Delta-circuit impedances the Y to D-circuit transformation
* Z5 ?% l$ O( v3 Rformula is as follows:
  }9 p9 d, M- m. oZPS = (ZpZs + ZpZt + ZsZt)/Zt
( U8 ?  R8 A/ S- V- {$ ^: mZPT = (ZpZs + ZpZt + ZsZt)/Zs
. u4 m$ B4 ]3 l4 p3 j3 IZST = (ZpZs + ZpZt + ZsZt)/Zp

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