What is the line voltage and conductor size for typical overhead AC three-phase transmission lines?

The line voltage and conductor size indicated in this choice reflect the standards commonly seen in overhead AC three-phase transmission lines. A voltage of 230 kV is characteristic of many high-voltage transmission systems, enabling efficient long-distance power transmission to reduce losses associated with lower voltage lines.

The conductor size of 1431 kCMIL ACSR (Aluminum Conductor Steel Reinforced) is appropriate for handling the high current loads that accompany such voltage levels. The use of ACSR conductors is prevalent in power utilities because they provide a strong balance of conductivity and tensile strength, which is necessary to support the physical requirements of overhead lines, particularly at high voltages where mechanical stability and conductivity are crucial.

Other options present various voltages and conductor sizes that don't align as effectively with typical high-voltage transmission line practices, making them less realistic options for standard overhead AC three-phase configurations.