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PowerGrid beats global peers in energy game


The testing station will give confidence to more Indian equipment manufacturers to get into the UHVAC segment, creating a domestic ecosystem.

India’s PowerGrid and a clutch of 35 domestic electrical equipment manufacturers have developed a system for transmitting bulk power with a force of 1,200kV, beating members of an exclusive club of six economies in the high-voltage transmission technology game. To put things in perspective, the new system’s transmission force is 5,454 times more than that of domestic power supply and 48 times more than the voltage – 25kV, or 25,000 volts – at which electricity is supplied to locomotives through overhead wires. Ratings of 1,000kV and above qualify as ‘ultra-high voltage (UHV)’ and UHVAC (ultra-high voltage alternate current) systems allow more power to be pushed through a line to make more efficient use of infrastructure and reduce costs. Globally, most of the transmission networks are rated at 400-800kV, described as ‘high voltage’. The UHVAC system is Made in India. Its carrying capacity is 6,000MW per circuit (line). This is equivalent to 10-12 circuits of 400kV AC lines. Adoption of 1,200kV transmission system with nominal voltage of 1,150kV allows 20-30% additional capacity. compared to nominal voltage of 1,000kV adopted by other countries.

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Sept 2020
01 Sep 2020