Southern Grid synchronously connected to India’s other Grids

Southern Grid has been synchronously connected to the rest of the Grid of India to accomplish a mission of One Nation–One Grid–One Frequency.

Jan 2, 2014 16:16 IST
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Southern Grid of India has been synchronously connected with the grids of the country. It was done on 31 December 2013 to successfully accomplish the mission of ‘One Nation - One Grid - One Frequency. This connection will boost the power trading business of the country.

The southern grid connectivity was achieved through commissioning of the Raichur-Solapur 765 kV single circuit transmission line by Power Grid Corporation of India Limited.

The country’s transmission network now transfers about 232 Gigawatts of installed power generation capacity with this interconnection. As per an official statement, it will help in increasing the inter-regional power transfer capacity of the Southern region. Indian Power System is operating through five Regional Grids and a Pan India synchronous grid was envisaged for optimal utilization of the generation resources in the country.

Earlier, regional grids namely Northern, Eastern, Western, North Eastern regions were synchronously connected and the Southern Region was connected to the North Eastern grid. Southern Region (SR) was connected to this NEW grid through HVDC links. Synchronous interconnection of SR with New grid was envisaged through high capacity 765 kV Raichur – Sholapur lines, as an ultimate step towards establishment of an “All India Synchronous National Grid” facilitating bulk transfer of power across regional boundaries.

The southern states namely Andhra Pradesh, Tamil Nadu and Kerala will be benefitted with the national grid as they are facing huge shortages. Due to the absence of the national grid, these states purchase electricity from the open market at higher prices.

This line of 208 circuit kilometers (ckm) and 765/400 kV substations at Raichur and Sholapur were commissioned five months ahead of its contractual schedule i.e. 31 May 2014. The project has been completed at an expense of approximately 815 crore rupees. With this interconnection, Indian power system has entered into a new era and become one of the largest operating synchronous grids in the world with about 232GW of installed power generation capacity.
Synchronous integration of Southern Grid with rest of the national power Grid shall not only augment the inter-regional power transfer capacity of Southern region but also relieve the congestion being experienced in few transmission corridors. This will be a great boost for further economic growth of the country.

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