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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 ?5 w1 m; v: a, O. u! s
impedances) given by manufacturer. They are NOT THE EQUIVALENT Delta-circuit
" c; c+ n8 m. timpedances of transformer. These values can be converted to the individual winding
4 q5 W: P& B* {5 Q6 T4 d* N& [impedances or the equivalent Y-circuit impedances using the following formulas:
j2 U; X5 `) zZp = 0.5 (Zps + Zpt – Zst)1 L* _: W: C( S: l
Zs = 0.5 (Zps + Zst – Zpt)9 ?# \! j7 {) H) t' p* ?: {! X
Zt = 0.5 (Zpt + Zst – Zps)% L% K% f3 |& v% K8 r, i
To obtain the equivalent Delta-circuit impedances the Y to D-circuit transformation! C) w3 N! ^2 k) `: X% W/ G
formula is as follows:: B6 H7 v! n) G. A- U
ZPS = (ZpZs + ZpZt + ZsZt)/Zt! y# g/ b, H) v. B# U7 q
ZPT = (ZpZs + ZpZt + ZsZt)/Zs: L7 y. }. |: U. A7 Y; ]' C
ZST = (ZpZs + ZpZt + ZsZt)/Zp |
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