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
impedances of transformer. These values can be converted to the individual winding
9 m5 i0 @& x) Y- [- |+ dimpedances or the equivalent Y-circuit impedances using the following formulas:
6 u. ^! Y+ _; t  u7 {Zp = 0.5 (Zps + Zpt – Zst)
4 p( F% n* n6 c. }, D; kZs = 0.5 (Zps + Zst – Zpt)
, X& ^7 {3 L  G! D! gZt = 0.5 (Zpt + Zst – Zps)
! h& |0 Z) g! f! s5 R0 a, n, E0 V$ oTo obtain the equivalent Delta-circuit impedances the Y to D-circuit transformation
formula is as follows:
ZPS = (ZpZs + ZpZt + ZsZt)/Zt
ZPT = (ZpZs + ZpZt + ZsZt)/Zs
% x% ]; X. ^8 V0 O( ZZST = (ZpZs + ZpZt + ZsZt)/Zp

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