For the circuit shown in figure-4, (i) (ii) (iii) Calculate the source current Is, and source voltage Vs. Draw the phasor diagram of Vo, Is, and Vs. Calculate the complex power S, real power P and reactive power Q supplied by the source; also calculate its power factor. L=0.1H Is S f=60Hz 2 + R=10Ω www 2kVA 0.8 power factor laggin I O + Figure-4 Ic V=110 <0°V (rms) C=50uF in

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HVDC

HVDC stands for high voltage direct current in the electric power transmission system. The high voltage direct current system uses direct current (DC) for the transmission of electrical power through transmission lines in contrast with the alternating current that is the AC system. The HVDC is used to transmit bulk power point-to-point through long distances transmission lines. Power is rapidly transferred because the efficiency of transmission lines is greatly increased over long distances due to HVDC lines.