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1 MVA Tx cables

Frankie 223

Hello,

On a project were a 1 MVA transformer is being installed, the cables from the transformer to the main LV panel are sized as 4x4x1C 240mm2 + 2x1C 240mm2 cpc.

UKPN advised that the transformer is only capable of receiving maximum 2x300mm2 single cables per phase.

Has anyone faced a similar situation?

Based on preliminary calculations it seems that the 2x300 per phase are not enough.

Your thoughts on this would be welcomed.

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    Can you get 2 x 630mm2 copper in?  I have done this in the past on ‘standard transformers’.

    Also are you sure its the Transformer Terminals that are the limitation.  Some DNO's provide a Circuit Breaker (either on the transformer or in a separate cabinet) for larger LV supplies (typ over 350/400kVA) and the supply is taken from the outgoing terminals of that?  This will depend where you are and what the DNO policy is.

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  • 0

    Can you get 2 x 630mm2 copper in?  I have done this in the past on ‘standard transformers’.

    Also are you sure its the Transformer Terminals that are the limitation.  Some DNO's provide a Circuit Breaker (either on the transformer or in a separate cabinet) for larger LV supplies (typ over 350/400kVA) and the supply is taken from the outgoing terminals of that?  This will depend where you are and what the DNO policy is.

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