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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+ R& j' c" G& {! _
impedances) given by manufacturer. They are NOT THE EQUIVALENT Delta-circuit3 Q& T7 C/ q( ^" N
impedances of transformer. These values can be converted to the individual winding& ^9 L3 \- m) g" @) x: \
impedances or the equivalent Y-circuit impedances using the following formulas:
7 Z0 K# |$ F" c$ k. p; ?Zp = 0.5 (Zps + Zpt – Zst): Z d# {" s: E$ s) @
Zs = 0.5 (Zps + Zst – Zpt)
" W; M- h4 i: k2 iZt = 0.5 (Zpt + Zst – Zps). W G/ S. |5 v& j; J5 {- o/ k" O
To obtain the equivalent Delta-circuit impedances the Y to D-circuit transformation% P6 y7 a/ V- q7 L8 J( ~
formula is as follows:7 x9 ~: T2 I% c
ZPS = (ZpZs + ZpZt + ZsZt)/Zt+ a' h8 c4 |" K: k
ZPT = (ZpZs + ZpZt + ZsZt)/Zs
/ w2 Z! R/ m' H5 H6 [2 M. U6 cZST = (ZpZs + ZpZt + ZsZt)/Zp |
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