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Three-phase systems

Publisher Summary

This chapter focuses on three-phase systems. Generation, transmission, and distribution of electricity via the National Grid system is accomplished by three-phase alternating currents. The voltage induced by a single coil when rotated in a uniform magnetic field, and is known as asingle-phase voltage. The majority of single-phase supplies are obtained by connection to a three-phase supply. A three-phase supply is generated when three coils are placed 120° apart and the whole rotated in a uniform magnetic field. A three-phase a.c. supply is carried by three conductors, called lines that are coloured red, yellow, and blue. A fourth conductor called the neutral—coloured black and connected through protective ...

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