Tender For periodical special assistance for breakdown / preventive maintenance & annual overhauling works of generator and its auxiliaries, generator relay panels, davr, generator control & common auxiliary desk panels, batteries & battery chargers of units -5, 6, 7 & 8, variablefrequencydrives for id fans of unit-5, 6 & 8, 400 kv switch yard controls & relay panels and marshaling kiosks, batteries and chargers for a period of one year