Sassaram HVDC project switched on in India

19 November 2002 – The Indian Prime Minister, Shri Atal Bihari Vajpayee, has officially inaugurated the Sasaram back-to-back High Voltage Direct Current (HVDC) interconnector project, built by Alstom, to complete the Indian national grid.

Built for Indian network operator PowerGrid, the Sasaram interconnector substation connects India’s northern regional transmission grid with the eastern regional transmission grid. This will provide 500MW more power to energy-starved Delhi in the northern region.

Sasaram is one of three such HVDC convertor stations built in India by Alstom that enable power to be transferred from different regions in order to alleviate localised energy shortages and best utilise existing resources.

The €50m Sasaram project completes the loop that interconnects India’s regional systems. The hydroelectric-rich north and south regions of India are now connected with the western and eastern regions, which have substantial coal reserves. The link at Sasaram, along with the previous two, will help to both stabilise the grids and alleviate power shortages across India.

Alstom, through its Transmission and Distribution Sector, supplied, on a turnkey basis, the back-to-back link at Sasaram comprising a 500 MW pole operating at 205kV DC, 2475A together with the required AC harmonic filters and a conventional switchyard. In addition to the transmission of real power between the regions, the links provided by Alstom also perform a reactive power control role, which helps the stabilisation of the network voltage.

Kurt Hakansson, Senior Vice-President of the Transmission Projects business within Alstom’s Transmission & Distribution Sector, said: “Alstom is a serious and experienced player in the HVDC market. The Sasaram turnkey HVDC project and its success testifies to our ability to provide the complete solution for the power transmission customer.”

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