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
, S5 a" j8 N6 X; \- e. J% n5 ~- @4 gimpedances) 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:
7 F( k9 O9 [9 |0 GZp = 0.5 (Zps + Zpt – Zst)
* f! }% Z' \1 s" A2 gZs = 0.5 (Zps + Zst – Zpt)
: L, V; D. [$ N, Y* RZt = 0.5 (Zpt + Zst – Zps)
2 F* C- J5 d% JTo obtain the equivalent Delta-circuit impedances the Y to D-circuit transformation
formula is as follows:
: T% m  G! Y0 qZPS = (ZpZs + ZpZt + ZsZt)/Zt
ZPT = (ZpZs + ZpZt + ZsZt)/Zs
4 K  d( Y1 [- i4 W) jZST = (ZpZs + ZpZt + ZsZt)/Zp

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