Answer / pp

As the Transformer size increases the current flowing
through LT also increases. For Transformers of 630 kVA and
above, single core cables are used for LT as the insulation
is not sufficient enough to carry large amount of current
at source (T/F Secondary)for poly core cables and leads to
phase to phase faults.

Note: current for cable at Secondary termination is larger
than at any point due to creation of multiple circuits.

Poly core cables are available in sizes upto 300 sq.mmm.
for LT .

Answer / k.prakashchandra

Cables of above 250 sq mm come in single core only in view
of the weight, workability and replacement.Al glands are to
be used for Al cables to avoid bi-metallic contacts.

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