bids are invited for custom bid for services - upgradation / supply & retrofitting of bio no 1 and 5 at pusauli hvdc btb station operation and maintenance of substation upgradation of bio no 1 and 5 and supply of spares at pusauli hvdc btb stat 1 supply of remote terminal unit with all the necessary accessories suitable for existing bay interface outstation (bio)-1 as per technical specifications 1 no. 2 retrofitting of existing bay interface outstation (bio)-1 module with the supplied rtu including dismantling of existing bio-1 modules and integrating with existing scada as per technical specifications 1 no. 3 supply of remote terminal unit with all the necessary accessories suitable for existing bay interface outstation (bio)-5 as per technical specifications 1 no. 4 retrofitting of existing bay interface outstation (bio)-5 module with the supplied rtu including dismantling of existing bio-5 modules and integrating with existing scada as per technical specifications 1 no. 5 supply of spare cards (2-cpu, 7-di, 4-do, 2-ai, 2-psu, 2-ios, 1-rack card without prefab cable) total quantity :