Areva T&D India’s transmission business (part of Alstom grid) on Thursday flagged off the world's largest 1200 kV capacitive voltage transformer (CVT) from its Hosur facility. The company, which invested Rs 950 crore in its operations in the country since 2007, said it would invest another Rs 50-60 crore, once the market develops for 1200 KV in the country.