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33kV/11kV delta delta transformer

KDY

When specifying 33kV/11kV and 11kV/400V transformers for new building project is it acceptable for 33kV/11kV transformer to be specified with delta-delta windings thus relying on cable screen and ground earth paths back to the remote DNO main substation? As opposed to delta-star with earthed neutral star point.

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    If it's delta delta, how do you provide an earth reference to the secondary side?

       - Andy.

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    If it's delta delta, how do you provide an earth reference to the secondary side?

       - Andy.

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