How to Select Indoor Outdoor Joint Kit

If I am reading and interpreting your question correctly, it sounds like you are replacing a 200 KVA transformer with a 750 KVA transformer.

The 200 KVA transformer is presently fed by a 3 core 50 Sqmm cable which when converted to AWG comes out right between a #1 and a 1/0 cable.

#1, 15KV cable will carry 130 amps.

The max current on the primary side of the 750KVA is 40 amps (@11,000V)

Theoretically, you should be able to use the existing cables but you may have to change the lugs.

Dear,

HT cable joint kit selection depend on cable size or load on cable. please send your comment.

For a transformer to have an outdoor or an indoor termination termination kit depends on whether you are terminating the cable in a cable box or directly connecting it to outdoor bushings of the transformer. A cable box would need an Indoor termination and incase the transformer has a bushing arrangement, you need an outdoor termination.

Presently you have a 3x50 sqmm outdoor xlpe termination, which can be used with the new transformer if it has a bushing arrangement. In case it has a cable box, the dimensions of the cable box will tell you that whether the outdoor termination can be accomodated in it or else you have to replace it with Indoor, which has a shorter height.

Please maintain proper clearences between the phases at the insulation screen edge of the cable.

In the event going in for a new higher sized cable, Kit selection will depend on voltage,Earthing type,size of conductor etc- & shall be indoor if in a enclosed cable box or outdoor incase of the termination is directly exposed to outdoor conditions.