ABSTRACT
At the end of this chapter you should be able to:
• describe a single-phase supply
• describe a three-phase supply
• understand a star IL=Ip and VL=√3Vp • draw a complete star-connected load
• understand a delta VL=Vp and IL=√3Ip • draw a phasor load
• calculate power in =√3VLIL cos φ • appreciate how system, by the one, two and three-wattmeter methods
• compare star and
• appreciate the
Generation, transmission and distribution of electricity via the National Grid system is accomplished by threephase alternating currents.
