A balanced three-phase Y-connected source with positive sequance has an internal voltage of 120 V/phase. The source feeds a balanced three-phase Y-connected load having an impedance of 39 + j28 N /phase. The impedance of the transmission line connecting the source to the load is 1+ j20/phase. The a- phase of the source is the reference voltage. a) Draw the equivalent per-phase-circuit for the phase "a". b) Calculate the three line currents in the transmission lines. c) Calculate the three phase voltages at load. d) Calculate the three line-to-line voltages at the terminals of the load.

Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter2: Fundamentals
Section: Chapter Questions
Problem 2.45P: Two balanced Y-connected loads, one drawing 10 kW at 0.8 power factor lagging and the other IS kW at...
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A balanced three-phase Y-connected source
with positive sequance has an internal voltage
of 120 V/phase. The source feeds a balanced
three-phase Y-connected load having an
impedance of 39 + j28 N /phase. The
impedance of the transmission line connecting
the source to the load is 1+ j20/phase. The a-
phase of the source is the reference voltage.
a) Draw the equivalent per-phase-circuit for
the phase "a".
b) Calculate the three line currents in the
transmission lines.
c) Calculate the three phase voltages at load.
d) Calculate the three line-to-line voltages at
the terminals of the load.
e) Calculate the total average power in watts
delivered to the load.
f) Calculate the total complex power in VA
delivered by the source.
Transcribed Image Text:A balanced three-phase Y-connected source with positive sequance has an internal voltage of 120 V/phase. The source feeds a balanced three-phase Y-connected load having an impedance of 39 + j28 N /phase. The impedance of the transmission line connecting the source to the load is 1+ j20/phase. The a- phase of the source is the reference voltage. a) Draw the equivalent per-phase-circuit for the phase "a". b) Calculate the three line currents in the transmission lines. c) Calculate the three phase voltages at load. d) Calculate the three line-to-line voltages at the terminals of the load. e) Calculate the total average power in watts delivered to the load. f) Calculate the total complex power in VA delivered by the source.
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