三绕组变压器阻抗折算
Conversion of equivalent Delta to Y circuit impedance of 3-winding transformers The impedances required in ETAP Transformer Editor are test data (or short-circuitimpedances) 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)
Zs = 0.5 (Zps + Zst – Zpt)
Zt = 0.5 (Zpt + Zst – Zps)
To obtain the equivalent Delta-circuit impedances the Y to D-circuit transformation
formula is as follows:
ZPS = (ZpZs + ZpZt + ZsZt)/Zt
ZPT = (ZpZs + ZpZt + ZsZt)/Zs
ZST = (ZpZs + ZpZt + ZsZt)/Zp 谢谢分享
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