Engineers of MP Power Transmission Company Ltd (MP Transco or MPPTCL) successfully carried out extensive repairs of a 40 MVA power transformer at the substation site itself.
In a release, MPPTCL said that the utility’s engineers demonstrated their technical expertise, efficient material management, and prompt decision-making by successfully carrying out major repairs of a severely damaged 40 MVA power transformer right at the substation site, and re-energizing it.
This initiative not only helped the company avoid potential financial losses but also eliminated the risk of prolonged outages in the transmission network during the critical Rabi crop load season, the release said.
Damaged by fire
The 40 MVA power transformer installed at the 132kV substation, Mangawan, in Rewa district was severely damaged due to a fire caused by technical reasons. After inspection, engineers from the transformer manufacturing company opined that on-site repair was not feasible and that the transformer would need to be transported to the manufacturer’s works for repairs.
However, considering the importance of 40 MVA capacity during the Rabi season and the requirements of the local transmission network, MP TRANSCO management decided to undertake the repair work at the site itself, the release noted.
Under the guidance of SE, Jabalpur Circle
Under the guidance of Superintending Engineer R.C. Sharma of the Jabalpur Circle (Headquarters), a detailed technical action plan was prepared for carrying out major repairs at the site.
Transformer spares available at various locations across the state — including HV/LV bushings, pressure-relief devices, oil valves, and various O-rings and gaskets (essential for preventing oil leakage)—were arranged promptly.
Superintending Engineer Sharma, along with Executive Engineer Narendra Patel from Jabalpur, camped at Mangawan and completed the high-level technical repair works in a phased manner within approximately 15 days.
The work included dismantling damaged bushings and fitting locally modified bushings in the turret, replacement of gaskets for the top cover and other parts of the transformer, required pre- and post-repair testing, transformer oil filtration, and other related procedures.
After completion of repairs and testing, the transformer was safely and successfully re-energized, the release added.
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Featured collage shows on-site repair work on the damaged 40 MVA power transformer at MPPTCL’s 132kV Mangawan substation in Rewa district, Madhya Pradesh. (Photos: MPPTCL)