Answer / pillay

it should be preventive maintenance,
what transformer.
any way like usual electrical installation.
1)check all termination for good fitting and sign of any damage
2) Check all insulation.
3) check all other associated equipments like cooling fans
thermometer. protection relays .
4)check for physical condition of the transformer for rust
or leaking oils
5) check for condition of the insulating transformer oil,
bushes and connecting cables and switchgear.

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