Sabap,
I have all three of the books you mentioned. I don't know if the the comparison between the Altsom book and the Protective Relaying Theory and Application by Walter Elmore published by Marcel Dekker is fair. They are different, but both very good. The Alstom book has been around a long time and is very good, but definitely based more on European practices. The book Protective Relaying: Theory and Applications by Walter Elmore is now in its 2nd Edition and has been updated to include more information on digital relaying. This book is based on the Old Westinghouse Applied Protective Relaying book which is also very good, but dated some since it doesn't address microprocessor based relays. Another very good book is Protective Relaying: Principles and Applications by J Lewis Blackburn published by Marcel Dekker is very good as well. It has been around a while and also is based on the Old Westinghouse Appied Protective Relaying book. All the above books are good, it just depends on what you are looking for. The Protective Relaying Theory and Applications has the most up to date information particularly with regards to microprocessor relays.
I assume the last book you mentioned Power System Analysis is the one published by Marcel Dekker. There are several others by the same title. The author of this book is J.C. Das. The price of the book is a little expensive, but after receiving my copy I feel like it is worth every cent and more. This book is now my go to book for questions about power system analysis. I have found the answers to almost every question I have had in this book. It not only gives good coverage to the theory of power system analysis, but also has great insight into the practical reasons behind why things are done the way they are. That is one of the things I appreciate about this book that I haven't find in many others.
Hope this helps you.
umrpwr
