(b) For a balanced three-phase star load connected system, it is measured that the magnitude of the voltage drops at the single-phase load is 200 V and the current flows in the same load is 102- 10° A. By considering positive sequence : (i) Calculate the phase load impedance, Z and express it in polar form. (ii) Draw the impedance triangle for the load. State either this load is inductive or capacitive. (iii) Identify the phase voltages (VRN, VyN and VaN). (iv) Identify the line currents (Ig. ly and Ia ). Identify the line voltages (Vgy, Vyg and VgR). (v) (vi) Sketch the phasor diagram for the phase and line voltages.

(b) For a balanced three-phase star load connected system, it is measured that the magnitude of the voltage drops at the single-phase load is 200 V and the current flows in the same load is 102- 10° A. By considering positive sequence : (i) Calculate the phase load impedance, Z and express it in polar form. (ii) Draw the impedance triangle for the load. State either this load is inductive or capacitive. (iii) Identify the phase voltages (VRN, VyN and VaN). (iv) Identify the line currents (Ig. ly and Ia ). Identify the line voltages (Vgy, Vyg and VgR). (v) (vi) Sketch the phasor diagram for the phase and line voltages.

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

Chapter6: Power Flows

Section: Chapter Questions

Problem 6.61P

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