NEW DELHI: Bharat Heavy Electricals Ltd. has bagged an order from Power Grid Corporation of India for design, development and supply of higher rating porcelain disc insulators for applications in +800 kV ultra high voltage direct current transmission lines. Valued at Rs. 6.30 crore, the order envisages supply of 5,000 numbers each of 420 kN and 320 kN insulators, by May 2008.