Answer / hareesh k.s.

actually PT is step down the voltage in large margin for
eg.110KV/110V.ie secondary current is very lage in
comparison with primary such as 1000times.therefore if
there is short circuit in secondary terminals or open
circuit in primary pt will burnt.

Answer / k.prakashchandra

1) contamination of oil and insulation failure 2)lightning
stroke 3) over voltage4)over current and overheating

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