Department of Electrical Engineering
Faculty of Engineering
Transmission line parameters:
Exercises
Modern Power System Analysis (KXGE 6101)
Semester 1, 2015/16
Exercise 1
a
c
b
D12=35’
D23=35’
Conductor layout
Notes: 35’ = 35 feet
D13=70’
Figure above shows a 500 kV 3-phase transpose line is
composed of one ACSR, 1, 272, 000-cmil 45/7 Bittern
conductor per phase with horizontal conductor
configuration. The conductor diameter is 1.345 inches and a
GMR of 0.5328 inches. Calculate the inductance and
capacitance per phase per km of the line.
Answers (pg.19, 29) :
L = 1.38mH/km
C = 0.0083uF/km
2
Exercise 2
Figure below shows a 500 kV 3-phase transpose line is
composed of one ACSR, 636, 000-cmil 24/7 Rook conductor
per phase with horizontal conductor configuration. d is the
line spacing between the centre of bundle. The conductor
diameter is 0.977 inches and a GMR of 0.3924 inches. Bundle
spacing is 18 inches. Calculate the inductance and
capacitance per phase per km of the line.
a
c
b
D12=35’
D13=70’
D23=35’
Conductor layout
Answers (pg.19, 20, 29) :
L = 1.0588mH/km, C = 0.0107 uF/km
3
Exercise 3
Figure below shows a 735 kV three-phase transpose line is
composed of four ACSR, 954, 000-cmil, 45/7 Rail conductors
per phase with horizontal conductor configuration. The
conductor diameter is 2.959 cm and a GMR of 1.173. Bundle
spacing is 46 cm. Calculate the inductance and capacitance
per phase per km of the line.
c
b
a
D23=44.5’
D12=44.5’
D13=89’
Conductor layout
Answers (pg.19, 20, 29) :
L = 0.8891mH/km, C = 0.0127uF/km
4
Exercise 4
Figure below shows a 345 kV double-circuit three-phase
transposed line is composed of two ACSR, 1, 431, 000-cmil,
45/7 Bobolink conductor per phase with vertical conductor
configuration. The conductor has a diameter of 1.427 in and
a GMR of 0.564 in. The bundle spacing is 18 in. Find the
inductance and capacitance per phase per km of the line.
a
c’
Conductor layout
11 m
7m
b’
b
Answers (pg. 20, 21, 29, 30) :
16.5 m
c
6.5 m
a’
L = 0.4486mH/km
C = 0.0255uF/km
12.5 m
5
Exercise 5
Figure below shows a 345 kV double-circuit three-phase
transposed line is composed of one ACSR, 556, 500-cmil,
26/7 Dove conductor per phase with horizontal conductor
arrangement. The conductor has a diameter of 0.927 in and a
GMR of 0.3768 in. Find the inductance and capacitance per
phase per km of the line.
Conductor layout
Answers (pg. 20, 21, 29, 30) :
L = 0.6853mH/km
C = 0.0167uF/km
6