Bracing for Cyclone Phailin,the countrys grid managers have taken the precautionary step of curtailing power flows through the Talcher-Kolar transmission line,a crucial link between the countrys eastern and southern grids that passes along the eastern coastline.
The Talcher-Kolar HVDC link is a 1,450-km HVDC (high voltage direct current) transmission line running from Talcher in Orissa to Kolar in Karnataka,with a capacity of wheeling 2,500 MW of power. It is a conventional bipolar system with overhead lines for the high-voltage conductors and ground return for the neutral current.
As a precautionary measure,the load on the line (Talcher-Kolar) has been reduced, said a government official. The southern region has been told to make up for the shortfall by stepping up its own hydro generation and through thermal stations in the region.
At present,the northern,western and eastern regions are integrally connected through strong AC (alternating current) transmission links and there is free flow of power between them. The southern region,though,is hooked up with the rest of the country through HVDC transmission links,which have constraints on wheeling capacity,thereby limiting the free flow of power.
Domestic and commercial electricity supplies in Gopalpur district in Orissa and Srikakukam in Andhra Pradesh have been curtailed,with only essential services being offered emergency supplies,to prevent possible short-circuits and other accidents.
Orissas cumulative load,which is around 3,000 MW,was curtailed to around 900 MW late Saturday evening.