"The substation, which is six metre below the ground, has already started feeding the Airport Line since June and would provide power supply to the Central Secretariat-Badarpur Line from next month," Delhi Metro Rail Corporation Director (Electrical) Satish Kumar said.
Built with an investment of Rs 60 crore in one-and-half year, the substations -- first of kind in India -- have been constructed with special ventilation, drainage and earthing system and house imported Gas Insulated Switchgear that saves space in comparison to air-insulated equipment, he said.
There is switching arrangement at the two inter-connected substations in case of power shutdown, Kumar said.
The top of the substations is maintained as park as per provisions of local laws in Lutyens zone that prohibited construction of the structures above the ground.
Kumar said NDMC has approached the DMRC to build such substations for it.
Source- Economic Times