01. AC system with rated voltage Vs=500kV, to be connected to a 6-pulse rectifier through a transformer with turn ratio r. The DC voltage Vd=250kV, DC current Id=1kA ,the converter equivalent reactance xd=35 ohm, and firing angle is 15⁰, find r=?. If the AC system voltage changes to 525kV or 475kV, what the r1 and r2 will be in order to keep the DC parameters unchanged?

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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.