Page 274

CHAP. 11]

POLYPHASE CIRCUITS

263

Fig. 11-24

Fig. 11-25

11.6

A three-phase, three-wire CBA system, with an effective line voltage 106.1 V, has a balanced Yconnected load with impedances 5 308  (Fig. 11-26). Obtain the currents and draw the voltage-current phasor diagram. With balanced Y-loads, the neutral conductor carries no current. Even though this system is threewire, the neutralpmay of the line ffiffiffi be added to simplify computation of the line currents. The magnitude pffiffiffi voltage is VL ¼ 2ð106:1Þ ¼ 150 V. Then the line-to-neutral magnitude is VLN ¼ 150= 3 ¼ 86:6 V. IA ¼

VAN 86:6 908 ¼ ¼ 17:32 608 A Z 5 308

Fig. 11-26

Mahmood_Nahvi_eBook_Schaum_s_Outlines_Theory_An  
Mahmood_Nahvi_eBook_Schaum_s_Outlines_Theory_An  
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