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
" A) _1 y) C; K7 W# V4 v8 V) Uimpedances) given by manufacturer. They are NOT THE EQUIVALENT Delta-circuit
impedances of transformer. These values can be converted to the individual winding
% J" e, [2 M; N# ?# Zimpedances 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)
: s- f8 a3 K" K& XTo obtain the equivalent Delta-circuit impedances the Y to D-circuit transformation
formula is as follows:
( p3 }0 D" \# {7 P$ g! f+ p# BZPS = (ZpZs + ZpZt + ZsZt)/Zt
ZPT = (ZpZs + ZpZt + ZsZt)/Zs
! R) G- K4 \( \0 iZST = (ZpZs + ZpZt + ZsZt)/Zp

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