Take €°= 1/(36π×10^9) A single core concentric cable is to be manufactured for a 100kV, 50Hz transmission system. The maximum permissible safe stress is to be 10,000,000V/m (rms) and the relative permittivity, 4 Calculate the most economical cable size.

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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.