230 kV is most characteristic of which part of the network?

• A. Distribution Systems
• B. Industrial Customer Systems
• C. Generation Systems
• D. Transmission Systems

Answer: (D)

High voltages like 230 kV are used to move large amounts of power efficiently over long distances. In power systems, generation starts at relatively low voltages, and transformers step the voltage up to transmission levels for the bulk network, where high voltage minimizes current and reduces I^2R losses and insulation needs. Once the power reaches its destination, substations and transformers step the voltage down for distribution to customers or for industrial use, where voltages are much lower. Since 230 kV is typical of the backbone used to transport power across regions rather than the lower-voltage feeders used to reach individual customers or plant equipment, it best characterizes the transmission systems.