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Leak due to oil penetration through the
bolts and threaded
connections
Flange gasket failures of top
cover/bottom
cover of transformer lids
Bushing leak through the base mounting
flanges Leak through drain plug /
On-line Tap Changer
( OLTC )/Level Dial Gauge
Leak through weld seams and radiator
fins
Failure of gaskets on flapper and
butterfly valves
controlling the flow of oil between the
radiator
and main oil tank
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