Handbook of Electric Power Calculations, Third Edition
A powerful calculations tool for electric power engineers and technicians, this book offers essential, step-by-step procedures and examples for solving a wide array of electric power problems.
TABLE OF CONTENTS Handbook of Electric Power Calculations, Third Edition
INDUCTIVE REACTANCE OF SIX-CONDUCTOR LINE
INDUCTIVE REACTANCE OF SIX-CONDUCTOR LINE
Calculate the per-phase inductive reactance of a six-conductor, three-phase line at 377 rad/s consisting of Teal ACSR conductors (Fig. 9.5). Distance D a 1 c 2=4.8 m, H 1= H 2=2.4 m, and D b 1 b 2=5.4 m.
Calculation Procedure
1. Determine GMD
The necessary dimensions for calculating GMD are: D a 1 b 2= D b 1 c 2=(2.4 2+5.1 2) 1/2=5.64 m, D a 1 b 1= D b 1 c 1=(2.4 2+0.3 2) 1/2=2.42 m, D a 1 c 1=4.8 m, and D a 1 c 2=4.8 m. Hence, GMD=[(2.42 2)(5.64 2)(4.8 2)] 1/6=4.03 m.
2. Determine GMR c
From Table 9.2, for Teal, GMR c=0.0341 ft (0.01 m). Then, D a 1 a 2= D c 1 c 2=(4.8 2+4.8 2) 1/2=6.78 m, D b 1 b 2=5.4 m, and GMR=[(0.01 3)(6.78 2)(5.4)] 1/6=0.252 m.
3. Calculate Inductive Reactance per Phase
X L=(377)(2 10 7)[ln(4.03/0.252)]=0.209 10 3 ?/m (0.336 ?/mi).
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