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
INDUCTANCE OF SIX-CONDUCTOR LINE
INDUCTANCE OF SIX-CONDUCTOR LINE
Calculate the per-phase inductance of the transmission line of Fig. 9.5 where the conductors are arranged in a double-circuit configuration.
Figure 9.5: Line conductors arranged in a double circuit configuration.
Calculation Procedure
1. Use Suitable Expression for 
Use 
=(2 10 ?7)ln(GMD/GMR) H/m, where GMR is the GMR of a conductor.
2. Calculate GMD
The GMD includes the distances between all the phase combinations. However, the expression for GMD can be reduced to one-half the distances that are represented in the original expression and the root becomes 1/6 rather than 1/12. Thus, GMD=( D a 1 b 1 D a 1 b 2 D a 1 c 1 D a 1 c 2 D a 1 c 1 D b 1 c 2) 1 /6m.
3. Calculate GMR
Use GMR= 
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