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
impedances) given by manufacturer. They are NOT THE EQUIVALENT Delta-circuit
  c: x7 T6 Y& f$ T% m, Zimpedances of transformer. These values can be converted to the individual winding
# `+ ?( }$ P/ E: d9 p8 Jimpedances or the equivalent Y-circuit impedances using the following formulas:
8 c7 j% F* \) f9 XZp = 0.5 (Zps + Zpt – Zst)
Zs = 0.5 (Zps + Zst – Zpt)
Zt = 0.5 (Zpt + Zst – Zps)
6 n2 V( F3 L: d- F8 u1 hTo obtain the equivalent Delta-circuit impedances the Y to D-circuit transformation
formula is as follows:
$ j/ S6 F; y/ J; d: vZPS = (ZpZs + ZpZt + ZsZt)/Zt
ZPT = (ZpZs + ZpZt + ZsZt)/Zs
7 R, q9 @+ P% D6 i3 k& FZST = (ZpZs + ZpZt + ZsZt)/Zp

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