INTRODUCTION

Although single-phase system is employed for the operation of almost all the domestic and commercial appliances, for example, lamps, fans, electric irons, refrigerators, TV sets, washing machines, exhaust fans, computers, etc. However, it has its own limitations in the field of generation, transmission, distribution, and industrial applications. Due to this, it has been replaced by polyphase system. Polyphase (three-phase) system is universally adopted for generation, transmission, and distribution of electric power because of its unchangeable superiority. In this chapter, we shall confine our attention to three-phase system and its practical utility in the field of engineering