Electrical Network Analysis (Sachan Book 30) by Dr. Vibhav Kumar Sachan

Author:Dr. Vibhav Kumar Sachan [Sachan, Dr. Vibhav Kumar]
Language: eng
Format: azw3, pdf
Publisher: Smt. Jay Devi Sachan Memorial Publication House
Published: 2019-09-28T16:00:00+00:00

Figure 2.23

Problem No. 2.10: A star-connected load consists of three identical coils each of resistance 30 Ω and inductance 127.3 mH. If the line current is 5.08 A, calculate the line voltage if the supply frequency is 50 Hz.

Solution:

Inductive reactance XL =2πfL =2π(50) (127.3×10−3) =40 Ω

Impedance of each phase Zp =√(R2 + X2L) =√(302 +402) =50 Ω For a star connection IL =Ip =VpZp

Hence phase voltage Vp =IpZp = (5.08)(50)=254V Line voltage VL =√3Vp =√3(254) =440V

Problem No. 2.11: A 415V, 3-phase, 4 wire, star-connected system supplies three resistive loads as shown in Figure 2.24. Determine (a) the current in each line and (b) the current in the neutral conductor.

Solution: (a) For a star-connected system VL =√3Vp

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