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发表于 2015-6-5 10:47:35
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The impedances required in ETAP Transformer Editor are test data (or short-circuit
W/ p: x+ i1 c$ w3 g. gimpedances) given by manufacturer. They are NOT THE EQUIVALENT Delta-circuit3 C5 y w0 a; Y0 f. H! r, h1 @7 [" Q
impedances of transformer. These values can be converted to the individual winding6 h! U( X* j1 r w; g M9 I8 |8 D
impedances or the equivalent Y-circuit impedances using the following formulas:, l, J0 `$ @" Y7 w# i
Zp = 0.5 (Zps + Zpt – Zst)" A/ {' |- n8 |3 X4 G: J: c- Y
Zs = 0.5 (Zps + Zst – Zpt)3 I1 n$ Y G! G' j( \( Y4 \
Zt = 0.5 (Zpt + Zst – Zps)
5 q9 S* l/ y5 Z5 U0 ZTo obtain the equivalent Delta-circuit impedances the Y to D-circuit transformation. [# Z/ l, ?; V$ F9 P
formula is as follows:
. x# a. K* \! k9 Y* }7 I4 V8 \; A9 gZPS = (ZpZs + ZpZt + ZsZt)/Zt" v6 k( A# {% \" ~3 B4 \, H2 l
ZPT = (ZpZs + ZpZt + ZsZt)/Zs" A" U& Y& s* E8 O
ZST = (ZpZs + ZpZt + ZsZt)/Zp |
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