The demand for the generation and transmission of large amounts of electric power today, necessitates transmission at extra-high voltages. In developed countries like USA, power transmission voltages have reached 765 kV or 1100 kV, and 1500 kV systems are also being built. In our country, 400 kV ac power systems have already come into operation, and in another 10 years time, every state is expected to be linked by a National Power Grid operating at 400 kV or at 800 kV. At this juncture, a practising electrical engineer or a student of electrical engineering is expected to possess knowledge of high-voltage techniques and should have sufficient background in high-voltage engineering.

An attempt has been made in this book, to bring together different topics in high voltage engineering to serve as a single semester course for final year undergraduate students or postgraduate students studying Electrical Engineering. This book is also intended to serve power engineers in the industry who are involved in the design and development of electrical equipment and also engineers in the electricity supply and utility establishments. It provides all the latest information on insulating materials, breakdown phenomena, overvoltage, and testing techniques.

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