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
impedances) given by manufacturer. They are NOT THE EQUIVALENT Delta-circuit
: y( r% r. z& X( aimpedances of transformer. These values can be converted to the individual winding
' n  v$ c3 w7 g: t0 Uimpedances or the equivalent Y-circuit impedances using the following formulas:
0 ^& ~4 |0 G2 [$ T. vZp = 0.5 (Zps + Zpt – Zst)
/ Y5 z2 c0 Z+ u: U0 r# {- z2 k2 P/ lZs = 0.5 (Zps + Zst – Zpt)
Zt = 0.5 (Zpt + Zst – Zps)
0 Q) a7 P" `2 {  e: ^8 d8 OTo obtain the equivalent Delta-circuit impedances the Y to D-circuit transformation
formula is as follows:
' ~$ h3 I  {4 G2 v; R3 F3 PZPS = (ZpZs + ZpZt + ZsZt)/Zt
' q- a1 x, ^0 [: v- o0 X( eZPT = (ZpZs + ZpZt + ZsZt)/Zs
2 p) ?$ k, [1 a% C6 R8 rZST = (ZpZs + ZpZt + ZsZt)/Zp

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