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
4 t; c) J& K1 [) m3 z3 g- Aimpedances) given by manufacturer. They are NOT THE EQUIVALENT Delta-circuit
impedances of transformer. These values can be converted to the individual winding
impedances or the equivalent Y-circuit impedances using the following formulas:
Zp = 0.5 (Zps + Zpt – Zst)
9 n3 J2 X3 q4 d0 w) {: @9 @Zs = 0.5 (Zps + Zst – Zpt)
5 Q, c0 c% a( N2 l4 d, yZt = 0.5 (Zpt + Zst – Zps)
; ?. B3 |) n. L/ t8 ZTo obtain the equivalent Delta-circuit impedances the Y to D-circuit transformation
formula is as follows:
1 m( H  ?7 m- Y3 cZPS = (ZpZs + ZpZt + ZsZt)/Zt
ZPT = (ZpZs + ZpZt + ZsZt)/Zs
ZST = (ZpZs + ZpZt + ZsZt)/Zp

lowlcity

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