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THREE-PHASE A.C. CIRCUITS Introduction

  •  Generation, transmission and heavy-power utilisation of A.C. electric energy almost invariably involve a type of system or circuit called a polyphase system or polyphase circuit. In such a system, each voltage source consists of a group of voltages having relative magnitudes and phase angles. Thus, am-phase system will employ voltage sources which, conventionally, consist of m voltages substantially equal in magnitude and successively displaced by a phase angle of 360° I m.
  •  A 3-phase system will employ voltage sources which, conventionally, consist of three voltages substantially equal in magnitude and displaced by phase angles of 120°. Because it possesses definite economic and operating advantages, the 3-phase system is by far the most common, and consequently emphasis is placed on 3-phase circuits.