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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-circuit2 M" T3 @; m3 x# ^* {
impedances) given by manufacturer. They are NOT THE EQUIVALENT Delta-circuit4 m5 h. n, h$ M+ K
impedances of transformer. These values can be converted to the individual winding+ z% j* k, p# g4 d0 E8 _' b
impedances or the equivalent Y-circuit impedances using the following formulas:1 a& t6 j! g' o9 S$ R) r" G7 z6 _
Zp = 0.5 (Zps + Zpt – Zst)" y% o& a% b: i
Zs = 0.5 (Zps + Zst – Zpt)2 B$ h- h: y( _& G; K
Zt = 0.5 (Zpt + Zst – Zps)
* _/ ]6 r. S+ r; f6 j6 |, wTo obtain the equivalent Delta-circuit impedances the Y to D-circuit transformation
5 W$ K6 w9 k1 }# z0 A$ Tformula is as follows:8 y+ |/ s2 C4 `8 K0 Q: R# I) i
ZPS = (ZpZs + ZpZt + ZsZt)/Zt
a- u4 n$ c; p' JZPT = (ZpZs + ZpZt + ZsZt)/Zs& o* Z. z: k4 n- m1 i' F# ^) P
ZST = (ZpZs + ZpZt + ZsZt)/Zp |
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