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  • Users: SMA7875
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  1. SMA7875

    Reversal of Transformer Phasing from Dyn11 to Dyn1

    Hi, Come across a situation where an old 33/11 Dyn11 transformer has to be replaced. The old transformer was connected R-Y-B to U-V-W bushings on 33kV side and R-Y-B to u-v-w on the 11kV side. The new transformer orientation is such that it is very difficult to connect R-Y-B to U-V-W bushings...
  2. SMA7875

    Two LV bus bars with Transformer Different Phasing / Phase Rotation

    Hi, We have come across an issue where we need to connect two 132/11kV power transformer LV (11kV) bus bars in parallel through an interconnector. The vector group of both is YN0yn0 however the HV bushing of one of the transformers is connected as Red phase to C Bushing, Yellow Phase to B...

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