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
. Q+ Q  V& l; P# n: _0 Limpedances) 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:
Zp = 0.5 (Zps + Zpt – Zst)
Zs = 0.5 (Zps + Zst – Zpt)
# P0 K5 V, p7 GZt = 0.5 (Zpt + Zst – Zps)
5 T  t; D2 v+ S* ~4 m6 ^To obtain the equivalent Delta-circuit impedances the Y to D-circuit transformation
+ X: x3 G+ M  G  @1 s9 u  Iformula is as follows:
7 k3 J4 @2 _6 q3 N& S( rZPS = (ZpZs + ZpZt + ZsZt)/Zt
ZPT = (ZpZs + ZpZt + ZsZt)/Zs
ZST = (ZpZs + ZpZt + ZsZt)/Zp

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