*Comments are invited up to Jst April, 1962 and will be published in the May 1962 issue.
This paper deals with the measurement of lightning currents in transmission line structures. The technique involved in such measurements by means of magnetic links, is discussed with particular reference to the lightning current investigation project initiated at the High Voltage Laboratory of the Indian Institute of Science, Bangalore. The line selected is about 15 miles (241313 km.) on the 110 kV. Shimoga-Bangalore Transmission line belonging to the Mysore State Electricity Board starting from the New Receiving Station (N.R.S.), Bangalore, involving about 74 steel masts of the line. The object of the paper is to report the technique and procedure involved in making such measurements that are made for the first time in India.
The important calibration and development work in the laboratory associated with such measurements is also discussed.
Although no links were magnetised during the first measuring season, results have been obtained at the very beginning of the second measuring season on May 13, 1961.
A stroke current of —108,000 amperes (peak) has been measured on the above 110 kV. line. This forms the first result of a field measurement of lightning current in transmission lines in India. These results are also given at the end of the paper.
