Power Grid Corp of India Ltd.
Source: Proceeding of GRIDTECH 2011, 3rd International Exhibitions and Conference, 19–21 April 2011, New Delhi
Indian power system is expanding at high rate with present installed capacity is about 1,64,000 MW comprising about 64% thermal, 23% hydro, 10% renewable and balance nuclear sources. The Planning Commission projections indicated about three (3) fold increase in peak demand over the next decade (by 2021/22) to a level of about 323,000 MW from the present level of about 119,000 MW for which total installed capacity of about 480 GW is envisaged. However optimal utilization of unevenly distributed energy resources in the country along with severe right of way issue and phase-wise development of transmission infrastructure necessitates establishment of high power transmission corridors. Towards this, a number of transmission corridors comprising 765kV AC, 1200kV AC, ± 800kV, 6000MW HVDC system have been planned/under implementation.
In this paper, the major consideration for the development of 1200 kV AC system, outcome of various studies & field trials conducted so far for optimization of conductor configuration, air clearances, corona, voltage distribution on insulator strings and status of development of various equipment and transmission line material has been detailed. This paper also describes in brief the insulation coordination studies carried out and major technical parameters considered for 1200 kV equipment such as Power Transformer, Disconnector, Circuit Breaker, Surge arrestor, Instrument Transformers, etc. and design details of 1200kV Transmission line.
