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“Electrical Power System” has been written primarily for the undergraduate students in Electrical Engineering. The book covers conventional topics like the basics of power systems, line constant calculations, performance of lines, corona, mechanical design of overhead lines etc., and the more advanced topics like load flows studies, economic load dispatch, optimal power flows, state estimation in power systems etc. The book covers a very wide spectrum of electrical power system studies which is normally not available in one single book.




The book is so comprehensibly written that at least five to six courses on power systems can be designed. It has been the constant endeavour of the author to understand the difficulties of his students in the classroom and accordingly prepare the lecture notes after consulting various journals and books on electrical power systems. The present book is an outcome of these notes and some research work the author carried out.




Chapters 1 to 9 deal into the electrical and mechanical design of overhead and underground transmission networks. The analysis and performance of the system in terms of line constant calculations, efficiency and regulations, corona loss and interference of power lines with communication networks have been studied. A chapter on mechanical design of lines gives in a nutshell all the important aspects of erection of overhead lines.




Chapter 5 on HVDC transmission discusses combined characteristics of rectifiers and inverters. Various controls like constant ignition angle, constant extinction angle, and constant currents have been discussed. Advantages and disadvantages of HVDC vs HVAC have been explained. Also, the role of HVDC link in improving system stability has been discussed. Chapter 10 is devoted to the study of voltage-reactive power problems on transmission lines.




Chapter 11 defines an effectively grounded system, discusses and compares various systems of neutral grounding.
Chapter 12 describes transients in power systems. Travelling waves on transmission lines, capacitance switching and lightning phenomenon have been discussed.




Chapter 13 discusses calculation of symmetrical and asymmetrical fault conditions on the system, concept of infinite bus and short circuit capacity of a bus. Electric Power System is the most capital intensive and the most complex system ever developed by man. Not only that the system should be operated most effectively and efficiently, any abnormality in the operation of the system must be detected fast and reliable operation of the protective system must be ascertained. Protective relays is the subject of Chapter 14 of the book wherein various types of relays from conventional electromechanical relays to digital protective relays have been discussed.




Chapter 15 presents material on the conventional circuit breakers like air break C.B., oil C.B., airblast C.B. etc., and the more advanced ones like the vacuum C.B. and SF6 circuit breakers. With the higher and higher operating voltages the impulse insulation levels of the system are increasing. Chapter 16 is devoted to the insulation problems of the system and the solutions in terms of coordinating the insulation levels economically of various equipments on the system have been discussed.




Chapter 17 deals into power system synchronous stability for a single machine connected to an infinite bus and multi-machine systems. Various techniques have been explained using algorithms and flow charts. With the advent of digital computers and modern methods of network solution, it has now been possible to analyse the present day large interconnected systems with greater accuracy andshort computational effort. Various techniques of load flow solutions of largenetworks have been discussed and explained using flow charts in Chapter 18.




Various techniques have been compared in terms of their complexities and computational efforts. With the advancement in technology of generation and load dispatching it has been possible to maintain the cost of electrical energy almost same even though the cost of fuel and other components have multiplied over the years.




Chapter 19 on economic load dispatching discusses some of the classical techniques which even today are being used by the electric utilities.The techniques have been explained with the help of flow charts, algorithms and suitable examples. Chapter 20 deals into the load frequency control or automatic generation control problems of the system.

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