11.18 An abc-sequence set of voltages feeds a balanced three- phase wye-wye system. If the line current in the a phase is 16.78/20.98° A rms, the line impedance is 1.2 + j1.8 N, and the input voltage Vab= 440/70° V rms, find the load imped- ance.

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Chapter8: Symmetrical Components
Section: Chapter Questions
Problem 8.6P
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I need help with question 11.18
ected
ower to
imped-
ne
he
is an
120/60° rms. The
an
abc-sequence set of voltages with V
per-phase impedance of the load is 12 + j16 2. If the line
impedance per phase is 0.8 + j1.4 , find the line currents
and the load voltages.
11.14 In a balanced three-phase system, the abc-phase-sequence
120/30° V rms. The
source is delta-connected and V
ab
load consists of two balanced wyes with phase impedances of
10 + j1 and 20+ j5 2. If the line impedance is zero, find
the line currents and the load phase voltage.noelen
11.15 An abc-phase-sequence three-phase balanced wye-connect-
ed 60-Hz source supplies a balanced delta-connected load.
The phase impedance in the load consists of a 20- resistor
in series with a 50-mH inductor, and the phase voltage at
the source is Van 120/20° V rms. If the line impedance is
zero, find the line currents in the system.
11.16 An abc-phase-sequence three-phase balanced wye-connected
source supplies power to a balanced wye-connected load.
The impedance per phase in the load is 14 + j12 2. If the
source voltage for the a phase is Va 120/80° V rms, and
the line impedance is zero, find the phase currents in the
wye-connected source.
an
00007 20
=
11.17 An abc-sequence balanced three-phase wye-connected
source supplies power to a balanced wye-connected load.
The line impedance per phase is 1 + j5 2, and the load
impedance per phase is 25 + j25 2. If the source line volt-
age Vab=208/0° V rms, find the line currents.
11.18 An abc-sequence set of voltages feeds a balanced three-
phase wye-wye system. If the line current in the a phase is
16.78/20.98° A rms, the line impedance is 1.2 + j1.8 , and
the input voltage Vab= 440/70° V rms, find the load imped-
ance.
11.19 An abc-sequence set of voltages feeds a balanced three-
phase wye-wye system. The line and load impedances are
1 + j1 22 and 10+j10 , respectively. If the load voltage
on the a phase is VAN = 110/30° V rms, determine the line
voltages of the input.
0001
Transcribed Image Text:ected ower to imped- ne he is an 120/60° rms. The an abc-sequence set of voltages with V per-phase impedance of the load is 12 + j16 2. If the line impedance per phase is 0.8 + j1.4 , find the line currents and the load voltages. 11.14 In a balanced three-phase system, the abc-phase-sequence 120/30° V rms. The source is delta-connected and V ab load consists of two balanced wyes with phase impedances of 10 + j1 and 20+ j5 2. If the line impedance is zero, find the line currents and the load phase voltage.noelen 11.15 An abc-phase-sequence three-phase balanced wye-connect- ed 60-Hz source supplies a balanced delta-connected load. The phase impedance in the load consists of a 20- resistor in series with a 50-mH inductor, and the phase voltage at the source is Van 120/20° V rms. If the line impedance is zero, find the line currents in the system. 11.16 An abc-phase-sequence three-phase balanced wye-connected source supplies power to a balanced wye-connected load. The impedance per phase in the load is 14 + j12 2. If the source voltage for the a phase is Va 120/80° V rms, and the line impedance is zero, find the phase currents in the wye-connected source. an 00007 20 = 11.17 An abc-sequence balanced three-phase wye-connected source supplies power to a balanced wye-connected load. The line impedance per phase is 1 + j5 2, and the load impedance per phase is 25 + j25 2. If the source line volt- age Vab=208/0° V rms, find the line currents. 11.18 An abc-sequence set of voltages feeds a balanced three- phase wye-wye system. If the line current in the a phase is 16.78/20.98° A rms, the line impedance is 1.2 + j1.8 , and the input voltage Vab= 440/70° V rms, find the load imped- ance. 11.19 An abc-sequence set of voltages feeds a balanced three- phase wye-wye system. The line and load impedances are 1 + j1 22 and 10+j10 , respectively. If the load voltage on the a phase is VAN = 110/30° V rms, determine the line voltages of the input. 0001
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