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- Washing of Core coil assembly by clean oil and re-tightening of clamping structure
- Cleaning of core coil assembly (CCA) and removal of sluge to avoid hotspots in the core and the windings.
- Removal of moisture from oil to prevent deterioration of the life of the cellulose insulation and monitoring the degree of polymerization (DP) of paper.
- Improvement in the insulation parameters like Polarisation (PI) & Tan Delta
- Fuctional checking of supervisory devices like Bucholz relay, PRV, MOG, OTI, WTI etc
- Overhauling of OLTC etc.