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1 MVA Tx cables

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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0 broadgage over 3 years ago

1 MVA is about 1350 amps per phase, the exact figure depending on whether the 1 MVA is presumed to be at 415 volts or at 433 volts.
Single core copper cables with aluminium armouring are commonly used for this sort of application. The 300mm size in that cable type is rated at about 700 amps by the makers of the cable, the exact figure depending on how installed.
So it seems doable if the transformer terminals can only accept a pair of 300mm cables.
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0 broadgage over 3 years ago

1 MVA is about 1350 amps per phase, the exact figure depending on whether the 1 MVA is presumed to be at 415 volts or at 433 volts.
Single core copper cables with aluminium armouring are commonly used for this sort of application. The 300mm size in that cable type is rated at about 700 amps by the makers of the cable, the exact figure depending on how installed.
So it seems doable if the transformer terminals can only accept a pair of 300mm cables.
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1 MVA Tx cables

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