We have great pleasure in presenting revised multicoloured edition of Volume-III of ‘A Textbook of Electrical Technology’. In this edition, two new chapters have been added namely ‘Rating & Service Capacity’ and ‘Distribution Automation’. The first chapter will be useful to degree/diploma students undergoing their first course in Electrical Drives. It also contains many solved problems for the benefit of students.

Another new chapter “Distribution Automation is a latest development in the field of Electrical Power System Engineering. Till recent years, stress was given on Generation and Transmission.

Distribution Automation provides means to more effectively manage minute by minute continuous operation of a distribution system. Hence both the utility and its customers are beneficiaries of successful Distribution Automation’. This is the topic, which is hardly covered by any other published book important topic, which should be prominently added during the revision of curriculum by different institutions, in near future.

The chapter of “Electric Traction’ has been enriched by adding some theory as well as solved problems. Also, few problems are added in the chapter ‘Industrial Application of Electric Motors’. The recent concept of digital control of electric motors is introduced in the chapter Electronic Control of A.C. Motors’. With these additions, we feel that contents of the book have been enriched and this title by Shri B.L. Theraja & Shri A.K. Theraja will continue to be popular in the academic circle.