Indian BHEL flags off first unit of 800 kV HVDC transformer March 14, 2019 | Asia-Pacific News Indian Bharat Heavy Electricals Limited (BHEL) has flagged off the first unit of its ±800 kV high voltage direct current (HVDC) transformers for the Raigarh–Pugalur project. This content is available to only paying subscribers. Username or E-mail Password Remember Me Forgot Password