(1) The first letter "J" voltage transformer .
    (2) The second letter "D" is a single phase and the "S" is a three phase.
    (3) The third letter “J†is oil-immersed and “Z†is epoxy cast.
    (4) The fourth letter "W" is a three-winding five-column type.
    (5) "-10" is a primary voltage level of 10kV.
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