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Appendix
R12 = R1 + R2 + (R1 x R2) / R3
R23 = R2 + R3 + (R2 x R3) / R1
R31 = R3 + R1 + (R3 x R1) / R2
Figure 5-8 Delta-connected windings
5.1.7 Winding Resistance Measurement of a 100 MVA
Transformer
The 220 kV/110 kV – 100 MVA transformer under test manufactured in 1995
was found to have conspicuously high quantities of gas in the oil, from which the
conclusion was drawn of inner overheating. The measurement results taken with
the test system (see Figure 5-9 "Winding resistance measurement H1-H0")
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