Power Transformer 220/110 (69) kV
Power Transformer 220/110 (69) kV
(OP)
I am currently designing a core type three-phase transformer, with three-legged core, 220/110(69) KV, 60/70 MVA, Y-Y connection. Can I do using serie-parallel winding for the secondary with reconnection. Is neccesary in this case, ysing a delta winding for reduce the third-harmonic voltage. Thanks.






RE: Power Transformer 220/110 (69) kV
RE: Power Transformer 220/110 (69) kV
RE: Power Transformer 220/110 (69) kV
Normally, transformers are designed for intended applications. The Y-Y transformers may have peculiar applications, e.g. tie two delta transformers. There may be other factors to be considered beside the triplen harmonics, e.g.:
Stabilization of neutral
External load may be supplied from tertiary
The transformer may be autotransformer
Etc.
RE: Power Transformer 220/110 (69) kV
a) The third harmonic hazards.
b) Possible neutral inversion.
c) Overexcitation
Thus problems doesn´t exist if both system and Y-Y transformers Grounded.