17

Three-phase Circuits and Systems

OBJECTIVES

In this chapter you will learn about:

  • Single-phase supply
  • Three-phase supply
  • Star connection and IL = Ip and VL = √3 VP
  • Delta connection and VL = Vp and IL = √3 Ip
  • Comparing star and delta connections
  • The Y–Δ change-over switch
  • Balanced and unbalanced loads
  • Advantages of three-phase systems
image

Three-phase Voltage

17.1  INTRODUCTION

When a piece of electrical equipment is plugged into the socket of a normal alternating current supply, it is connected between the terminal of one phase and the neutral wire, as shown in Figure 17.1. Thus, a normal alternating current circuit may also be described as ...

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